JP6301641B2 - Control device, power transmission device and control system - Google Patents

Description

  The present invention relates to a control device, a power receiving device, a power transmitting device, and a control system used in a power feeding system including a power transmitting device and a power receiving device that consumes power supplied from the power transmitting device by a magnetic resonance method.

  Conventionally, techniques for supplying power from a power transmission device to a power reception device wirelessly have been studied. For example, a magnetic field resonance method has been proposed as such a wireless power feeding method. Specifically, by adjusting the capacitance (C) and inductance (L) of each resonance circuit so that the resonance circuit of the power transmission device and the resonance circuit of the power reception device resonate at a specific frequency, the power transmission device to the power reception device. Then, power is supplied wirelessly (for example, Patent Document 1). The power receiving device includes a load that consumes the power supplied from the power transmitting device.

JP 2011-166883 A

  When the power consumption of the power receiving apparatus increases, the load on the power transmission apparatus increases when the transmission power of the power transmission apparatus corresponding to the power consumption exceeds the allowable power transmission capacity.

  Then, an object of this invention is to provide the control apparatus, power receiving apparatus, power transmission apparatus, and control system which reduce the load of a power transmission apparatus.

The control device according to the first feature is provided integrally with the power transmission device used in a power feeding system including a power transmission device and a plurality of power receiving devices that consume power supplied wirelessly from the power transmission device, or The control device is provided separately from the power transmission device. The control device includes a control unit that calculates a predicted power consumption that is a power consumption of the power receiving device that is predicted when the operation state of the power receiving device is changed when the operation state of the power receiving device is requested. . Wherein, Ri exceeded the threshold sum of the predicted consumed electric power is determined based on the transmission capacity of the power transmission device, and, if the first condition or the second condition is satisfied, the power receiving device The operating state of the power receiving apparatus is controlled so that the power consumption of the power receiving apparatus does not increase . The first condition is a condition that the degree of magnetic coupling between the power transmission device and the power reception device is larger than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device. The second condition is a condition that a distance between the power transmission device and the power reception device is smaller than a distance at which the power transmission efficiency of the power transmission device is maximized.

In the first aspect, the control unit, by receiving information about the power consumption of the power receiving apparatus operating state of the power receiving device is predicted when changing from the power receiving device, the predicted power consumption calculate.

  In the first feature, the apparatus further includes a transmission unit that transmits to the power receiving device a prohibition notification that prohibits the operation state of the power receiving device from being changed to a predetermined operation state, and the control unit calculates the predicted power consumption. The transmitting unit transmits the prohibition notification to the power receiving apparatus when the calculated predicted power consumption exceeds the threshold value.

  In the first feature, when the calculated predicted power consumption does not exceed the threshold value, the transmission unit transmits a permission notification that permits the operation state of the power receiving apparatus to be changed to the predetermined operation state. Transmit to the power receiving device.

The control device according to the second feature is provided integrally with the power transmission device used in a power feeding system including a power transmission device and a plurality of power reception devices that consume power supplied wirelessly from the power transmission device, or The control device is provided separately from the power transmission device. When there is a change request for changing the operation state of the power receiving device to a predetermined operation state, the control device predicts power consumption that is power consumption of the power receiving device predicted when the operation state of the power receiving device is changed And a control unit that calculates the power consumption when the predicted power consumption exceeds the first threshold value and falls below the second threshold value, the operation state of the power receiving apparatus is an operation that consumes less power than the predetermined operation state. A transmission unit that transmits a limited permission notification that permits a change to a state to the power receiving device.

A power transmission device according to a third feature wirelessly supplies power to a plurality of power reception devices. The power transmission device includes a control unit that calculates a predicted power consumption that is a power consumption of the power receiving device that is predicted when the operation state of the power receiving device is changed when the operation state of the power receiving device is changed. . Wherein, Ri exceeded the threshold sum of the predicted consumed electric power is determined based on the transmission capacity of the power transmission device, and, if the first condition or the second condition is satisfied, the power receiving device The operating state of the power receiving apparatus is controlled so that the power consumption of the power receiving apparatus does not increase . The first condition is a condition that the degree of magnetic coupling between the power transmission device and the power reception device is larger than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device. The second condition is a condition that a distance between the power transmission device and the power reception device is smaller than a distance at which the power transmission efficiency of the power transmission device is maximized.

The control system according to a fourth feature is provided integrally with the power transmission device, a plurality of power reception devices that consume power supplied wirelessly from the power transmission device, and the power transmission device that controls the power reception device, Or the control apparatus provided integrally with the said power transmission apparatus is included. A control unit configured to calculate a predicted power consumption that is a power consumption of the power receiving device that is predicted when the operation state of the power receiving device is changed when there is a request to change the operation state of the power receiving device; Prepare. Wherein, Ri exceeded the threshold sum of the predicted consumed electric power is determined based on the transmission capacity of the power transmission device, and, if the first condition or the second condition is satisfied, the power receiving device The operating state of the power receiving apparatus is controlled so that the power consumption of the power receiving apparatus does not increase . The first condition is a condition that the degree of magnetic coupling between the power transmission device and the power reception device is larger than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device. The second condition is a condition that a distance between the power transmission device and the power reception device is smaller than a distance at which the power transmission efficiency of the power transmission device is maximized.

  ADVANTAGE OF THE INVENTION According to this invention, the control apparatus, power receiving apparatus, power transmission apparatus, and control system which reduce the load of a power transmission apparatus can be provided.

FIG. 1 is a diagram illustrating a power transmission system 100 according to the first embodiment. FIG. 2 is a diagram illustrating the power transmission device 10 according to the first embodiment. FIG. 3 is a diagram illustrating the power receiving device 20 according to the first embodiment. FIG. 4 is a diagram illustrating an application scene of the power transmission system 100 according to the first embodiment. FIG. 5 is a diagram illustrating an application scene of the power transmission system 100 according to the first embodiment. FIG. 6 is a diagram illustrating an application scene of the power transmission system 100 according to the first embodiment. FIG. 7 is a sequence diagram illustrating the power transmission method according to the first embodiment.

  Hereinafter, a power transmission system according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
The control device according to the embodiment is a control device used in a power feeding system including a power transmission device and a power receiving device that consumes power supplied wirelessly from the power transmission device. The control device includes a control unit that calculates predicted power consumption that is power consumption of the power receiving device that is predicted when an operation state of the power receiving device is changed. The control unit controls an operation state of the power receiving device so that the predicted power consumption does not exceed the threshold when the predicted power consumption exceeds a threshold value.

  In the embodiment, in order to control the operating state of the power receiving device so that the predicted power consumption, which is the power consumption of the power receiving device predicted when the operating state of the power receiving device is changed, does not exceed a threshold, the load of the power transmitting device is reduced. Can be reduced.

[First Embodiment]
(Power transmission system)
Hereinafter, the power transmission system according to the first embodiment will be described. FIG. 1 is a diagram illustrating a power transmission system 100 according to the first embodiment. FIG. 2 is a diagram illustrating the power transmission device 10 according to the first embodiment. FIG. 3 is a diagram illustrating the power receiving device 20 according to the first embodiment.

  As illustrated in FIG. 1, the power transmission system 100 includes a power transmission device 10 and a power reception device 20, and supplies power from the power transmission device 10 to the power reception device 20 using a magnetic field resonance method. In FIG. 1, one power receiving device 20 is illustrated, but a plurality of power receiving devices 20 may be provided in the power transmission system 100. The power receiving device 20 includes, for example, sensors (human sensor, temperature sensor, illuminance sensor) provided at each position in the room, and operates with electric power supplied from the power transmitting device 10. The power transmission device 10 is embedded, for example, in a room ceiling or under the floor in order to supply power to each sensor.

  In the first embodiment, the power transmission system 100 is not particularly limited, but may include an EMS (Energy Management System) for controlling power of a consumer. EMS includes HEMS (Home Energy Management System), BEMS (Building Energy Management System) provided in the building, FEMS (Factory Energy Management) established in the factory, and other facilities in the factory. It is done.

  As illustrated in FIG. 2, the power transmission device 10 includes a power transmission side resonator 11, a power transmission module 12, and a communication module 13.

  The power transmission side resonator 11 is a resonator adjusted to resonate at a specific frequency. Specifically, as illustrated in FIG. 2, the power transmission side resonator 11 includes a capacitor C and an inductance L (coil). For example, by adjusting the capacitance of the capacitor C, the resonance frequency of the power transmission side resonator 11 can be adjusted to a specific frequency.

  The power transmission module 12 is a module that transmits electric power. Specifically, as illustrated in FIG. 2, the power transmission module 12 is directly connected to a commercial power source or connected to the commercial power source via an AC adapter.

  Here, when the power transmission module 12 is directly connected to a commercial power source, the power transmission module 12 includes a converter 12A and an inverter 12B. Converter 12A and inverter 12B generate AC power having a specific frequency. In such a case, converter 12A is an AC / DC converter, which converts AC power supplied from a commercial power source into DC power, and inverter 12B converts DC power output from converter 12A to AC of a specific frequency. Convert to electricity.

  On the other hand, when the power transmission module 12 is connected to a commercial power supply via an AC adapter, the power transmission module 12 includes only the inverter 12B. The inverter 12B generates AC power having a specific frequency. In such a case, the inverter 12B converts the DC power output from the converter 12A into AC power having a specific frequency.

  In these cases, the magnitude of the transmission power of the power transmission device 10 is determined by the magnitude of the AC power output from the inverter 12B.

  The communication module 13 is a module that communicates with the power receiving device 20. The communication module 13 may communicate with the EMS described above. Specifically, the communication module 13 includes a communication unit 13A and a control unit 13B.

  The communication unit 13 </ b> A is connected to the power receiving device 20 wirelessly or by wire, and transmits a signal to the power receiving device 20 and receives a signal from the power receiving device 20. For example, as described later, the communication unit 13A transmits a search signal for searching for the power receiving device 20. 13 A of communication parts transmit the information request | requirement which requests | requires transmission of the information for specifying the kind of power receiving apparatus 20 with a search signal included in a search signal or separately from a search signal. Here, the information for identifying the type of the power receiving device 20 is, for example, a category (for example, low power consumption, medium power consumption, high power consumption) or a type of power receiving device ( For example, it may be a mobile terminal, a sensor, or a home appliance). On the other hand, the communication unit 13 </ b> A receives the authentication ID of the power receiving device 20. The authentication ID is returned from the power receiving device 20 in response to the search signal. The communication unit 13A receives information for specifying the type of the power receiving device 20 together with the search signal or included in the search signal or separately from the search signal. Information for specifying the type of the power receiving device 20 is returned from the power receiving device 20 in response to the information request.

  The communication unit 13 </ b> A transmits a power consumption notification request to the power receiving device 20. Further, the communication unit 13 </ b> A receives a power consumption notification indicating power consumption for each operation state of the power receiving device 20 from the power receiving device 20. The communication unit 13 </ b> A may receive the received voltage or the received signal strength (RSSI) of the power receiving device 20 from the power receiving device 20.

  13 A of communication parts receive the operation state change request | requirement which requests | requires changing the operation state of the power receiving apparatus 20 to a predetermined | prescribed operation state from the power receiving apparatus 20. FIG. Here, the predetermined operation state refers to, for example, a standby state, a call state, a state in which a specific application (video reproduction application or the like) is executed, a state in which a web page is displayed by a browser, and the like. The operation state change request may include a predetermined operation state to be changed and power consumption of the predetermined operation state. The communication unit 13 </ b> A transmits a rejection notification for rejecting the operation state change request or a permission notification for permission to the power receiving device 20. Alternatively, the communication unit 13A transmits to the power receiving device 20 a prohibition notification that prohibits changing the operating state of the power receiving device 20 to a predetermined operating state.

  The control unit 13B controls the power transmission module 12 and the communication module 13. In addition, the control unit 13B controls the power transmission power of the power transmission device 10 by controlling the power transmission module 12 based on the information acquired by the communication unit 13A. The control unit 13B may be provided in the power transmission module 12 instead of being provided in the communication module 13. The control unit 13B may be provided in a control device different from the communication module 13 and the power transmission module 12, or the control device may control the communication module 13 and the power transmission module 12.

  Here, the power receiving device 20 to be transmitted is preferably the power receiving device 20 authenticated by the power transmitting device 10 (control device). Therefore, it is preferable that the number of power receiving devices 20 to be transmitted is the number of power receiving devices 20 authenticated by the power transmitting device 10 (control device).

  The control unit 13B stores information on the power receiving device 20 acquired through the communication unit 13A. Specifically, the control unit 13B stores power consumption for each operation state of the power receiving device 20.

  The control unit 13B calculates predicted power consumption that is power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed. Specifically, the control unit 13B receives information related to predicted power consumption, which is power consumption of the power receiving device 20 predicted when the operation state is changed from the power receiving device 20, so that the operation state of the power receiving device 20 is determined. The predicted power consumption, which is the power consumption of the power receiving device predicted in the case of the change, is calculated. The control unit 13B, for example, the power consumption for each operation state of the power receiving device 20 and the information regarding the predicted power consumption that is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed will be described later. Information included in the operation state change request notification is used. Specifically, the control unit 13B calculates the predicted power consumption when the operating state of the power receiving device 20 is changed to a predetermined operating state based on the power consumption for each operating state of the power receiving device 20. The information included in the operation state change notification includes at least information on the operation state to be changed (for example, execution of a video application), and in addition to this, information on power consumption in the operation state may be included. Good.

  In addition, the control unit 13B receives power so that the predicted power consumption does not exceed the threshold when the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed, exceeds the threshold. The operating state of the device 20 is controlled. Specifically, the control unit 13B, when the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed to a predetermined operation state, exceeds a threshold value, A prohibition notification that prohibits changing the operation state of 20 into a predetermined operation state is generated. Alternatively, the control unit 13B issues an operation state change request received from the power receiving device 20 when the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed, exceeds a threshold value. Generate a rejection notice to reject. The threshold is determined based on, for example, the power transmission capacity of the power transmission device. In addition, when a plurality of power receiving devices 20 exist, the total power consumption predicted by the plurality of power receiving devices may exceed the threshold as a trigger for generating the prohibition notification.

As illustrated in FIG. 3 , the power receiving device 20 includes a power receiving side resonator 21, a power receiving module 22, and a communication module 23.

  The power receiving side resonator 21 is a resonator adjusted so as to resonate at a specific frequency. Specifically, as shown in FIG. 3, the power receiving resonator 21 includes a capacitor C and an inductance L (coil). For example, the resonance frequency of the power receiving resonator 21 can be adjusted to a specific frequency by adjusting the capacitance of the capacitor C.

  The power receiving module 22 is a module that receives power. Specifically, as shown in FIG. 3, the power reception module 22 includes a rectifier circuit 22A, a DC / DC converter 22B, a load 22C, and a power storage unit 22D.

  The rectifier circuit 22A rectifies the power supplied from the power receiving resonator 21. In other words, the rectifier circuit 22A converts AC power supplied from the power receiving resonator 21 into DC power. The DC / DC converter 22B performs step-up conversion or step-down conversion of the power supplied from the rectifier circuit 22A. The load 22C is transmitted by the power transmission device 10 and operates with the power supplied from the DC / DC converter 22B, and is, for example, the above-described sensors. The power storage unit 22D stores power that is transmitted by the power transmission device 10 and supplied from the rectifier circuit 22A. The power storage unit 22D is, for example, an electric double layer capacitor or a secondary battery.

  Although FIG. 3 illustrates a case where the power receiving module 22 includes the power storage unit 22D, the embodiment is not limited to this. That is, the power receiving module 22 may not include the power storage unit 22D.

  The communication module 23 is a module that communicates with the power transmission device 10. The communication module 23 may communicate with the EMS described above. It should be noted that the communication module 23 operates with power supplied by the power transmission device 10. Specifically, the communication module 23 includes a communication unit 23A and a control unit 23B. Note that the communication module 23 is not limited to being operated by the power supplied from the power transmission device 10, and has a separate power supply source such as a storage battery, and may be supplied with power from other than the power transmission device 10. .

  The communication unit 23 </ b> A is connected to the power transmission device 10 wirelessly or by wire, transmits a signal to the power transmission device 10, and receives a signal from the power transmission device 10. For example, as will be described later, the communication unit 23A receives a search signal for searching for the power receiving device 20. The communication unit 23A receives an information request for requesting transmission of information for specifying the type of the power receiving device 20. On the other hand, the communication unit 23A transmits the authentication ID of the power receiving device 20 in response to receiving the search signal. The communication unit 23A transmits information for specifying the type of the power receiving device 20 in response to the reception of the information request.

  The communication unit 23 </ b> A receives the power consumption notification request from the power transmission device 10. In addition, the communication unit 23 </ b> A transmits a power consumption notification indicating the power consumption for each operation state of the power receiving device 20 to the power transmitting device 10. Here, the communication unit 23 </ b> A may transmit a power consumption notification indicating the power consumption in the current operating state of the power receiving device 20 instead of transmitting a power consumption notification indicating the power consumption in each operating state of the power receiving device 20. Good.

  The communication unit 23 </ b> A transmits an operation state change request for requesting to change the operation state of the power receiving device 20 to a predetermined operation state to the power transmission device 10. In addition, the communication unit 23 </ b> A receives a permission notification or a prohibition notification for the operation state change request from the power transmission device 10.

  When the communication unit 23A receives the permission notification for the operation state change request, the control unit 23B changes to the operation state according to the operation state change request, while the communication unit 23A receives the prohibition notification for the operation state change request. Then, the current operation state is maintained without changing to the operation state according to the operation state change request. Here, when maintaining the current operation state, the control unit 23B prevents the transmission of the operation state change request to the power transmission device 10 within a predetermined time (for example, 10 minutes). May be controlled.

  Further, the communication unit 23 </ b> A may transmit the received voltage of the power supplied from the power transmission device 10 to the power transmission device 10. Alternatively, the communication unit 23 </ b> A may transmit the signal strength (RSSI) received from the power transmission device 10 to the power transmission device 10.

  The control unit 23 </ b> B controls the power reception module 22 and the communication module 23. For example, the control unit 23B supplies appropriate power to the load 22C under the control of the DC / DC converter 22B. Alternatively, the control unit 13B controls the load 22C according to an instruction received from the EMS.

(Applicable scene)
Hereinafter, application scenes of the power transmission system according to the first embodiment will be described. FIG. 4 is a diagram illustrating an application scene of the power transmission system 100 according to the first embodiment.

  As shown in FIG. 4, in the first embodiment, the power transmission system 100 includes a power transmission device 10, a plurality of power reception devices 20, and an EMS 30. In FIG. 4, the power receiving device 20 is shown as a plurality of sensors (temperature / humidity sensor, human sensor). The power transmission device 10 and the power reception device 20 are attached to an indoor wall or ceiling. The power transmission device 10 supplies power to the plurality of power reception devices 20 by a magnetic field resonance method.

  In the magnetic field resonance method, the power transmission efficiency changes according to the distance (power transmission distance) between the power transmission device 10 and the power reception device 20. Here, the power transmission efficiency refers to the ratio of the received power of the power receiving device 20 to the transmitted power of the power transmitting device 10.

  In the magnetic field resonance method, when the transmission distance is a predetermined distance, the degree of magnetic coupling between the resonance circuit of the power transmission device 10 and the resonance circuit of the power reception device 20 is optimal, and the maximum power transmission efficiency is obtained.

  However, when the power transmission distance is smaller than the predetermined distance, the degree of magnetic coupling between the resonance circuit of the power transmission device 10 and the resonance circuit of the power reception device 20 becomes excessive. In this case, when the operating state of the power reception device 20 changes and the power consumption of the power reception device 20 increases, the power transmission device 10 increases the transmission power following the power consumption of the power reception device 20. If the power consumption of the power receiving device 20 exceeds the power transmission capacity of the power transmitting device 10, the power transmitting device 10 may be overloaded and destroyed.

  Therefore, it is preferable that the control unit 13B controls the operation state of the power receiving device 20 after making the following determination. For example, the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operating state of the power receiving device 20 is changed, exceeds a threshold, and the degree of magnetic coupling between the power transmitting device 10 and the power receiving device 10 is When the power transmission efficiency of the device 10 is greater than the maximum magnetic coupling degree, the control unit 13B controls the operation state of the power receiving device so that the power consumption of the power receiving device 20 does not increase. The degree of magnetic coupling between the power transmission device 10 and the power reception device 20 can be estimated from, for example, the power transmission voltage of the power transmission device 10 or the power reception voltage of the power reception device 20. The power transmission voltage of the power transmission device 10 increases as the power transmission distance increases, and conversely, the power reception voltage of the power reception device 20 decreases as the power transmission distance increases. Therefore, the control unit 13B stores the power transmission voltage of the power transmission device 10 when the power transmission efficiency of the power transmission device 10 is maximized, and when the power transmission voltage is lower than that, the magnetism between the power transmission device 10 and the power reception device 20 is stored. It is determined that the degree of mechanical coupling is greater than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device 10. Alternatively, the control unit 13B stores the voltage value of the power reception voltage of the power reception device 20 when the power transmission efficiency of the power transmission device 10 is maximum, and when the actual power reception voltage is higher than the voltage value, the power transmission device 10 And the power receiving device 20 are determined to be larger than the magnetic coupling degree at which the power transmission efficiency of the power transmission device 10 is maximized.

  Further, the control unit 13B stores the voltage value of the power reception voltage of the power reception device 20 when the power transmission efficiency of the power transmission device 10 in each of the plurality of operation states of the power reception device 20 is maximized. Depending on the operating state, the voltage value of the received voltage stored corresponding to the operating state may be compared with the actual received voltage.

  Alternatively, the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operating state of the power receiving device 20 is changed, exceeds the threshold, and the distance between the power transmitting device 10 and the power receiving device 20 (power transmission distance). However, when the power transmission efficiency of the power transmission device 10 is smaller than the maximum distance, the control unit 13B controls the operation state of the power reception device 10 so that the power consumption of the power reception device 20 does not increase. The power transmission distance can be estimated from the received signal strength (RSSI) of the signal received by the communication module 13 or 23 in the power transmission device 10 or the power reception device 20, for example. The control unit 13B stores the RSSI of the signal received by the communication module 13 or 23 at the power transmission distance when the power transmission efficiency of the power transmission device 10 is maximized, and the signal of the signal actually received by the communication module 13 or 23 is more than that. When the RSSI is large, it is determined that the power transmission distance is smaller than the distance at which the power transmission efficiency of the power transmission device 10 is maximized.

  It should be noted that in FIG. 4, an EMS 30 is provided. In such a case, instead of the power transmission device 10 (the control unit 13B), the EMS 30 may perform the above-described determination and control the operation state of the power reception device 20. It should be noted that the distance between the power transmission device 10 (or EMS 30) and each power reception device 20 is constant. In such a case, the power transmission device 10 (or EMS 30) performs the above-described determination only for the power reception device 20 having a shorter distance from the power transmission device 10 than the distance at which the power transmission efficiency of the power transmission device 10 is maximized. Alternatively, the above-described determination may be performed for all the power receiving devices 20.

  Next, a case where the power transmission device 10 determines whether or not the operation state of the power reception device 20 can be changed in the initial state where the power transmission device 10 is activated will be described with reference to FIG. In FIG. 5, the power receiving device 20 (power receiving devices 20A, 20B, 20C) is shown as a mobile device such as a smartphone or a tablet terminal. In such a case, since the distance between the power transmission device 10 and the power reception device 20 (power reception devices 20A, 20B, 20C) is variable, the power transmission device 10 includes all the power reception devices 20 (power reception devices 20A, 20B, 20C) is preferably performed as described above with reference to FIG.

  In FIG. 5, the power transmission device 10 is activated and receives a power consumption notification (20A: 1W, 20B: 1W, 20C: 1W) from the power reception device 20 (20A, 20B, 20C), and receives the power reception device 20 (20A, 20B). 20C) shows a state in which an operation state changeable notification is transmitted. The power transmission capacity (allowable transmission power) of the power transmission device 10 is 20W. In addition, the operating state of the power receiving device 20 (power receiving devices 20A, 20B, and 20C) includes either a standby state with low power consumption (1W) or a power consumption state with high power consumption (10W). The standby state refers to a state in which the load 22C is stopped and only the communication module 23 operates to consume power. The consumption state refers to a state where the load 22C and the communication module 23 operate to consume power. Here, the consumption state may specifically mean a state in which an operation with high power consumption is executed, such as a call state or a state in which a specific application (video playback application or the like) is executed. In FIG. 5, the operating state of the power receiving device 20 (power receiving devices 20A, 20B, 20C) is a standby state.

  Hereinafter, after the power transmission device 10 is activated, a power consumption notification is received from the power reception device 20 (20A, 20B, 20C), and an operation state changeable notification is transmitted to the power reception device 20 (20A, 20B, 20C) The process up to is explained.

  The power transmission device 10 transmits a search signal for searching for the power reception device 20. The power receiving device 20 (power receiving devices 20A, 20B, 20C) that has received the search signal transmits the authentication ID of the power receiving device 20 (power receiving devices 20A, 20B, 20C) to the power transmitting device 10. When the authentication ID stored in advance and the authentication ID received from the power receiving device 20 match, the power transmitting device 10 authenticates the power receiving device 20 as the transmission source. Here, it is assumed that the power receiving devices 20A, 20B, and 20C are authenticated as the power receiving devices 20 to be transmitted.

  The power transmission device 10 transmits a power consumption notification request for requesting information indicating power consumption for each operation state of the power reception device 20 to the power reception device 20 (power reception devices 20A, 20B, and 20C). The power receiving device 20 (power receiving devices 20A, 20B, 20C) that has received the power consumption notification request transmits a power consumption notification including information indicating power consumption for each operation state to the power transmitting device 10. Here, the power receiving device 20 transmits to the power transmitting device 10 a power consumption notification including information indicating the power consumption for each operation state, and transmits information indicating the current operating state of the power receiving device 20.

  The power transmission device 10 determines whether or not the operation state of the power reception device 20 (power reception devices 20A, 20B, 20C) can be changed based on the power consumption notification received from the power reception device 20 (power reception devices 20A, 20B, 20C). Specifically, the power transmission device 10 calculates the predicted power consumption that is the power consumption of the power reception device 20 predicted when the operation state of the power reception device 20 (power reception devices 20A, 20B, and 20C) is changed. Contrast. The threshold value is the allowable power (20 W) of the power transmission device 10.

  Note that the threshold value may vary according to the distance between the power transmission device 10 and the power reception device 20. For example, the threshold is 20 W when the distance between the power transmission device 10 and the power reception device 20 is smaller than a predetermined distance (for example, the distance at which power transmission efficiency is maximized), and the distance between the power transmission device 10 and the power reception device 20 is predetermined. If the distance is larger than the distance (for example, the distance at which the power transmission efficiency is maximized), the value is smaller than 20W. In addition, when the distance between the power transmission device 10 and the power reception device 20 is greater than a predetermined distance (for example, the distance at which power transmission efficiency is maximized), the threshold may be decreased as the distance increases.

  First, in FIG. 5, the total power consumption of the power receiving device 20 (power receiving devices 20A, 20B, and 20C) when the operating state of the power receiving device 20A is changed from the standby state to the consumption state of the power receiving device 20A. Calculate the value. In this case, since the power consumption of the power receiving apparatus 20A is 10 W, the total power consumption of the power receiving apparatus 20 is 12 W, which is below the threshold (20 W). Therefore, the power transmission device 10 determines that the predicted power consumption, which is the power consumption of the power reception device 20 predicted when the operation state of the power reception device 20 (power reception devices 20A, 20B, 20C) is changed, is below the threshold value. The power transmission device 10 transmits an operation state change permission notification for permitting the operation state change to the power reception device 20A, and the power reception device 20A can change the operation state in accordance with the received operation state change permission notification. Is displayed on a display or the like. In addition, the power receiving apparatus 20A performs control so that an operation state change request can be transmitted in response to the received operation state change permission notification.

  Similarly, when the operation state of the power receiving device 20B or the power receiving device 20C is changed to the consumption state, the total value of the power consumption of the power receiving device 20 (power receiving devices 20A, 20B, 20C) is below the threshold value. Transmits an operation state change permission notification to the power reception devices 20B and 20C, and the power reception devices 20B and 20C indicate on the display or the like that the operation state can be changed in accordance with the received operation state change permission notification. indicate.

  Next, a case where the power transmission device 10 determines whether the operation state of the power reception device 20 can be changed during power transmission from the power transmission device 10 to the power reception device 20 will be described with reference to FIG. 6. 6, similarly to FIG. 5, the power receiving device 20 (power receiving devices 20A, 20B, and 20C) is shown as a mobile device. In FIG. 6, when the operation state of all the power reception devices 20 (power reception devices 20A, 20B, and 20C) is a standby state, the power reception device 20A shows a state in which the operation state is changed.

  The power receiving device 20A transmits, to the power transmitting device 10, an operation state change request that requests the operation state to be changed from the standby state to the consumption state. The power transmission device 10 determines whether or not the operation state can be changed for the power reception device 20A. As described in FIG. 5, when the operating state of all the power receiving devices 20 (power receiving devices 20A, 20B, 20C) is in the standby state, even if the operating state of the power receiving device 20A is changed from the standby state to the consumption state, Since the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed, is below the threshold, the power transmitting device 10 transmits an operation state change permission notification to the power receiving device 20A. To do. The power receiving device 20A changes the operation state from the standby state to the consumption state in response to the received operation state change permission notification.

  Here, since the operating state of the power receiving device 20A is in the consumption state, the total power consumption of the power receiving device 20 (power receiving devices 20A, 20B, 20C) is 12 W, and the difference from the threshold (20 W) is 8 W. Become.

  The power transmission device 10 determines whether or not the operation state of the power reception device 20 (power reception devices 20A, 20B, and 20C) can be changed. First, from the state of FIG. 6, the total power consumption of the power receiving device 20 (power receiving devices 20A, 20B, and 20C) when the operation state of the power receiving device 20B is changed to the consumption state is calculated. In this case, since the power consumption of the power receiving device 20B is 10 W, the total power consumption of the power receiving device 20 is 21 W, which exceeds the threshold (20 W). Therefore, the power transmission device 10 determines that the predicted power consumption, which is the power consumption of the power reception device 20 predicted when the operation state of the power reception device 20 (power reception devices 20A, 20B, 20C) is changed, exceeds the threshold value. The power transmission device 10 transmits an operation state prohibition permission notification that prohibits the operation state change to the power reception device 20B, and the power reception device 20B cannot change the operation state in response to the received operation state change prohibition notification. It is displayed on a display or the like.

  Similarly, when the operation state of the power receiving device 20C is changed to the consumption state, the total power consumption of the power receiving device 20 (power receiving devices 20A, 20B, and 20C) exceeds the threshold value. An operation state change prohibition notification is transmitted to 20C, and the power receiving apparatuses 20B and 20C display on the display or the like that the operation state cannot be changed according to the received operation state change prohibition notification.

  Note that when the operating state of the power receiving device 20A is changed from the state of FIG. 6, that is, when the operating state of the power receiving device 20A is changed from the consumption state to the standby state, the power receiving device 20 (the power receiving devices 20A, 20A, The total power consumption of 20B, 20C) naturally decreases and falls below the threshold value. As described above, the power transmission device 10 transmits the operation state change permission notification to the power reception device 20A in response to the operation state change permission notification requesting to change the operation state of the power reception device 20A to the consumption state. The transmission of the operation state change permission notification permitting the change of the operation state of the apparatus 20A from the consumption state to the standby state may be omitted. However, when the operation state of the power receiving apparatus 20A further includes a high consumption state in which the power consumption is larger than the consumption state, the operation state change permission notification requesting to change the operation state of the power reception apparatus 20A to the consumption state is given. On the other hand, after the operation state change permission notification is transmitted to the power receiving device 20A, an operation change prohibition notification for prohibiting the change to the high consumption state is further transmitted to the power receiving device 20A.

  Note that when the power receiving device 20 (power receiving devices 20A, 20B, 20C) receives the operation state change permission notification from the power transmitting device 10, the display indicating that the operation state can be changed may be omitted.

(Power transmission method)
Hereinafter, a power transmission method according to the first embodiment will be described. FIG. 7 is a sequence diagram illustrating the power transmission method according to the first embodiment.

  First, a process performed in an initial state in which the power transmission device 10 is activated and the power receiving device 20 to be transmitted is not detected will be described. As illustrated in FIG. 7, in step S <b> 10, the power transmission device 10 transmits a search signal for searching for the power reception device 20.

  In step S <b> 11, the power receiving device 20 that has received the search signal transmits the authentication ID of the power receiving device 20 to the power transmitting device 10. The power transmission device 10 authenticates the power reception device 20 as a power transmission target when the authentication ID stored in advance matches the authentication ID received from the power reception device 20. Hereinafter, the power receiving device 20 refers to one or more power receiving devices 20 that are authenticated as power transmission targets. In step S <b> 11, the power receiving device 20 may transmit information for specifying the type of the power receiving device 20 to the power transmitting device 10 together with the authentication ID.

  In step S <b> 12, the power transmission device 10 transmits a power consumption notification request for requesting power consumption notification for each operation state of the power reception device 20 to the power reception device 20.

  In step S <b> 13, the power receiving device 20 that has received the power consumption notification request transmits a power consumption notification indicating the power consumption for each operation state to the power transmission device 10. Here, the power receiving device 20 transmits a power consumption notification including information indicating power consumption for each operation state to the power transmitting device 10, and the current operation state (for example, standby state or consumption state) of the power receiving device 20. ) Is transmitted.

  In step S <b> 14, the power transmission device 10 determines whether or not the operation state can be changed based on the power consumption notification received from the power reception device 20. Specifically, the power transmission device 10 calculates a predicted power consumption that is a predicted power consumption when the operation state of the power reception device 20 is changed to a predetermined operation state, and whether or not the predicted power consumption exceeds a threshold value. Determine whether. Here, when a plurality of power receiving apparatuses 20 are authenticated as power transmission targets, the predicted power consumption that is the power consumption of the power receiving apparatus 20 predicted when the operation state of the power receiving apparatus 20 is changed is the power transmission target. The total value of the predicted power consumption of all the power receiving devices 20 that are authenticated as

  In step S <b> 15, the power transmission device 10 transmits an operation state change permission notification to the power reception device 20. Specifically, even when the operating state of the power receiving device 20 is changed, when the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operating state of the power receiving device 20 is changed, falls below the threshold value, The power transmission device 10 transmits an operation change permission notification to the power reception device 20. When the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed, by changing the operating state of the power receiving device 20 to a predetermined operating state exceeds a threshold value The power transmission device 10 transmits an operation change prohibition notification that prohibits the change to the predetermined operation state to the power receiving device 20.

  In step S <b> 16, the power receiving device 20 displays whether or not the operating state can be changed in response to the received notification that the operating state can be changed.

  Secondly, a process when the power receiving device 20 tries to change the operation state in a state where power is transmitted from the power transmitting device 10 to the power receiving device 20 will be described. In step S <b> 17, the power receiving device 20 transmits an operation state change request for changing the operation state to a predetermined operation state to the power transmission device 10.

  In step S <b> 18, the power transmission device 10 determines whether the operation state of the power reception device 20 can be changed. Here, the power transmission device 10 determines whether or not the operation state can be changed not only for the power reception device 20 that has transmitted the operation state change request but also for all the power reception devices 20 that are authenticated as power transmission targets. That is, the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of each power receiving device 20 is changed to a predetermined operation state, is calculated, and the future power consumption of the power receiving device 20 exceeds the threshold value. It is determined whether or not.

  In step S <b> 19, the power transmission device 10 transmits an operation state change permission notification to the power reception device 20. Specifically, even when the operating state of the power receiving device 20 is changed, when the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operating state of the power receiving device 20 is changed, falls below the threshold value, The power transmission device 10 transmits an operation change permission notification to the power reception device 20. When the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed, by changing the operating state of the power receiving device 20 to a predetermined operating state exceeds a threshold value The power transmission device 10 transmits to the power receiving device 20 an operation change rejection notification that rejects the operation state change request. Here, it should be noted that the power transmission device 10 transmits not only the power receiving device 20 that has transmitted the operation state change request but also all the power receiving devices 20 that are authenticated as power transmission targets, to notify whether or not the operation state can be changed. It is.

  In step S <b> 20, the power receiving device 20 displays whether or not the operating state can be changed in response to the received notification that the operating state can be changed.

(Function and effect)
In the first embodiment, the operation state of the power receiving device 20 is controlled so that the predicted power consumption, which is the power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is changed, does not exceed the threshold. The load on the device 10 can be reduced.

  Specifically, the power transmission device 10 calculates a predicted power consumption that is a power consumption of the power receiving device 20 predicted when the operation state of the power receiving device 20 is a predetermined operation state, and compares the predicted power consumption with a threshold value. To do. When the predicted power consumption exceeds the power transmission capacity of the power transmission device 10, the power transmission device 10 may be destroyed due to overload. Therefore, when the future power consumption of the power receiving apparatus 20 exceeds the threshold value, the power transmitting apparatus 10 transmits an operation state change prohibition notification for prohibiting the operation state change to the predetermined operating state to the power receiving apparatus 20, and the power transmitting apparatus 10 Avoid overloading.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the embodiment, communication between the power transmission device 10 and the power reception device 20 is performed using communication modules (the communication module 13 and the communication module 23). However, the embodiment is not limited to this. For example, communication between the power transmission device 10 and the power reception device 20 may be performed using the power transmission module 12 and the power reception module 22 (in-band communication).

  In the embodiment, the case where the power control unit that controls the transmission power of the power transmission device 10 is provided in the power transmission device 10 is illustrated. However, the embodiment is not limited to this. The power control unit that controls the transmission power of the power transmission device 10 may be provided in an EMS such as a HEMS.

  In the embodiment, a case has been described in which the power transmission device 10 determines whether or not the operation state of the power reception device 20 can be changed by comparing future power consumption of the power reception device 20 with one threshold value. However, the embodiment is not limited to this. For example, when the future power consumption of the power receiving device 20 exceeds the first threshold and falls below the second threshold, the power transmitting device 10 changes the operating state of the power receiving device 20 to a predetermined operating state. May be transmitted to the power receiving apparatus 20 with permission to restrict the change to an operation state with less power consumption than a predetermined operation state. For example, when the power receiving device 20 is a moving image playback device and the operation state of the power receiving device 20 includes a standby state, a low image quality playback state in which a moving image is played back with low image quality, and a high image quality playback state in which a moving image is played back with high image quality To do. When the operating state of the power receiving device 20 is changed to the high image quality reproduction state, the predicted power consumption that is the predicted power consumption of the power receiving device 20 when the operating state of the power receiving device 20 is changed exceeds the second threshold value. When the operating state of the power receiving device 20 is changed to the low image quality reproduction state, the predicted power consumption that is the power consumption of the power receiving device 20 predicted when the operating state of the power receiving device 20 is changed is equal to or greater than the first threshold value. When it is less than or equal to the second threshold, the power transmission device 10 transmits a limited permission notification that permits the low image quality reproduction state to the power receiving device 20 while prohibiting the change to the high image quality reproduction state.

  Further, the threshold value may be changed according to the power transmission distance. For example, when the power transmission distance is long, the threshold value may be decreased, and when the power transmission distance is short, the threshold value may be increased.

  Although not specifically mentioned in the embodiment, a program for causing a computer to execute each process performed by the power transmission device 10 and the power reception device 20 may be provided. The program may be recorded on a computer readable medium. If a computer-readable medium is used, a program can be installed in the computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.

  Alternatively, a chip configured by a memory that stores a program for executing each process performed by the power transmitting device 10 and the power receiving device 20 and a processor that executes the program stored in the memory may be provided.

  DESCRIPTION OF SYMBOLS 10 ... Power transmission apparatus, 11 ... Power transmission side resonator, 12 ... Power transmission module, 12A ... Converter, 12B ... Inverter, 13 ... Communication module, 13A ... Communication part, 13B ... Control part, 20 ... Power reception apparatus, 21 ... Power reception side resonance 22 ... Power receiving module 22A ... Rectifier circuit 22B ... DC / DC converter 22C ... Load 22D ... Power storage unit 23 ... Communication module 23A ... Communication unit 23B ... Control unit 30 ... EMS

Claims (7)

Used in a power feeding system including a power transmission device and a plurality of power receiving devices that consume power supplied wirelessly from the power transmission device, a control provided integrally with the power transmission device or provided separately from the power transmission device A device,
When there is a request to change the operating state of the power receiving device,
A controller that calculates predicted power consumption, which is power consumption of the power receiving device predicted when the operating state of the power receiving device is changed,
Wherein, Ri exceeded the threshold sum of the predicted consumed electric power is determined based on the transmission capacity of the power transmission device, and, if the first condition or the second condition is satisfied, the power receiving device the operating state of the power receiving device control so that power consumption is not increased,
The first condition is a condition that the degree of magnetic coupling between the power transmission device and the power receiving device is greater than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device,
The second condition is that the distance between the power transmitting apparatus and the power receiving device, the power transmission control device transmitting efficiency, wherein condition der Rukoto that less than the distance as the largest device.   Used in a power feeding system including a power transmission device and a plurality of power receiving devices that consume power supplied wirelessly from the power transmission device, a control provided integrally with the power transmission device or provided separately from the power transmission device A device,
  Control for calculating a predicted power consumption that is a power consumption of the power receiving device that is predicted when the operation state of the power receiving device is changed when there is a change request for changing the operation state of the power receiving device to a predetermined operation state. And
  When the total predicted power consumption exceeds the first threshold and falls below the second threshold, the operation state of the power receiving apparatus is changed to an operation state with less power consumption than the predetermined operation state. A control device comprising: a transmission unit that transmits a limited permission notification to be permitted to the power receiving device. Wherein, by receiving information about the power consumption of the power receiving apparatus operating state of the power receiving device is predicted when changing from the power receiving device, and calculating means calculates the predicted power consumption The control device according to claim 1 or 2 . A transmission unit that transmits to the power receiving device a prohibition notification for prohibiting changing the operating state of the power receiving device to a predetermined operating state;
The control device according to claim 1, wherein the transmission unit transmits the prohibition notification to the power receiving device when the calculated predicted power consumption exceeds the threshold. When the predicted power consumption does not exceed the first threshold, the transmission unit transmits a permission notification that permits the operation state of the power receiving apparatus to be changed to the predetermined operation state. The control device according to claim 2 . A power transmission device that wirelessly supplies power to a plurality of power reception devices,
A control unit that calculates predicted power consumption that is power consumption of the power receiving device that is predicted when the operation state of the power receiving device is changed when there is a request to change the operating state of the power receiving device;
Wherein, Ri exceeded the threshold sum of the predicted consumed electric power is determined based on the transmission capacity of the power transmission device, and, if the first condition or the second condition is satisfied, the power receiving device the operating state of the power receiving device control so that power consumption is not increased,
The first condition is a condition that the degree of magnetic coupling between the power transmission device and the power receiving device is greater than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device,
The second condition is the power transmission device the distance between the power transmitting device and the power receiving device, the power transmission efficiency of the power transmission device is characterized in terms der Rukoto that less than the distance becomes maximum. A power transmission device, a plurality of power reception devices that consume power supplied wirelessly from the power transmission device, and the power transmission device are provided integrally with the power transmission device or provided separately from the power transmission device. A control system including a control device,
A control unit configured to calculate a predicted power consumption that is a power consumption of the power receiving device that is predicted when the operation state of the power receiving device is changed when there is a request to change the operation state of the power receiving device; Prepared,
Wherein, Ri exceeded the threshold sum of the predicted consumed electric power is determined based on the transmission capacity of the power transmission device, and, if the first condition or the second condition is satisfied, the power receiving device the operating state of the power receiving device control so that power consumption is not increased,
The first condition is a condition that the degree of magnetic coupling between the power transmission device and the power receiving device is greater than the degree of magnetic coupling that maximizes the power transmission efficiency of the power transmission device,
The second condition is a control system wherein a distance between the power transmitting apparatus and the power receiving device, the power transmission efficiency of the power transmission device is characterized in terms der Rukoto that less than the distance becomes maximum.

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