JP4777155B2 - Electronic equipment, contactless charger and contactless charging system - Google Patents

Description

The present invention relates to an electronic device , a contactless charger, and a contactless charging system that can charge electric power supplied from a contactless charger.

  2. Description of the Related Art Secondary batteries that can be repeatedly charged and discharged are usually used for portable electronic devices such as cellular phones in order to secure the power supply. As a system for charging the secondary battery, a non-contact charging system that can charge the secondary battery in a non-contact state with an electronic device has been devised.

  Such a non-contact charging system is widely used mainly for devices such as an electric shaver where it is desirable to avoid exposure of the charging terminal, but it is expected that it will also be used in devices such as mobile phones in the future. Is done. For example, Patent Documents 1 and 2 describe a mobile phone that employs a non-contact charging system.

JP-A-2005-143181 JP 2006-115562 A

  Although charging services for mobile phones are provided at hotels and restaurants, etc., electronic devices such as mobile phones are currently mainly contact-type charging systems. It takes time to fully support a contactless charging system. Therefore, when the user of the mobile phone adopting the non-contact charging system does not carry a dedicated charger, there may be a situation that charging on the go cannot be performed.

  In addition, when an abnormality occurs in a secondary battery or an electronic device that is charged, a protection circuit that normally detects overcurrent and heat generation and stops charging the secondary battery is provided. In the charging system, even if an abnormality occurs on the electronic device side, the charger cannot detect the abnormality and continues to supply power.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electronic device and a non-contact charging system that are compatible with both a contact type and a non-contact type charging method. It is another object of the present invention to provide an electronic device , a contactless charger, and a contactless charging system that can suppress unnecessary power supply in the charger .

The present invention provides a secondary battery capable of charging electric power supplied from a contactless charger, a protection circuit for monitoring a charge state of the secondary battery, and the contactless charger. An authentication unit that performs communication and performs authentication for permitting power supply from the contactless charger, wherein the authentication unit sends identification information to the contactless charger every predetermined time. When the abnormality is detected in the charging state by the protection circuit, information indicating that authentication is not established is transmitted to the non-contact charger .

The present invention also includes an authentication unit that performs communication with an electronic device and performs authentication for permitting power supply to the electronic device, and a control unit that controls whether power is supplied to the electronic device. The authentication unit receives the identification information from the electronic device every predetermined time, and is transmitted from the electronic device when an abnormality is detected in the charging state of the electronic device. Information from which the authentication is not established is received from the electronic device, the electronic device is authenticated based on the identification information and the information that the authentication is not established, and the control unit is connected to the electronic device by the authentication unit. If the authentication is not established, control to turn off the power supply to the electronic device is performed.

ADVANTAGE OF THE INVENTION According to this invention, the electronic device and non-contact charge system which can respond to both a contact-type and non-contact-type charge system can be provided. In addition, it is possible to provide an electronic device , a contactless charger, and a contactless charging system that can suppress unnecessary power supply in the charger .

  Hereinafter, a battery pack, an electronic device, and a non-contact charging system according to embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a mobile phone will be described as an example of an electronic device. However, the electronic device according to the present embodiment can be applied to various electronic devices that use a secondary battery as a power source, such as a personal digital assistant (PDA).

(First embodiment)
FIG. 1 is a block diagram for explaining an outline of a charging system according to a first embodiment of the present invention, and FIG. 2 is a main configuration of a contactless charging circuit of a contactless charging apparatus according to the first embodiment of the present invention. FIG. 3 is a block diagram showing a main configuration of the non-contact charging circuit of the mobile phone according to the first embodiment of the present invention.

  As shown in FIG. 1, the charging system of the present embodiment includes a mobile phone 1a, a battery pack 2 that is detachably attached to the mobile phone 1a, a contact charger 3, and a non-contact charger 4. Prepare. The mobile phone 1a contacts the contact charger 3 and receives power supply to charge the secondary battery of the battery pack 2, and receives power supply in a non-contact state with the non-contact charger 4. The secondary battery of the battery pack 2 can be charged.

  The contact charger 3 is connected to an AC power source 51 and includes an AC adapter 31 that converts AC power into DC power, and a power supply terminal that supplies DC power output from the AC adapter 31 to the outside.

  The non-contact charger 4 includes an AC adapter 41, a non-contact charging circuit 42, a coil 43, a temperature detection unit 44, and a control unit 45.

  The AC adapter 41 is connected to the AC power source 52, converts AC power into DC power, and outputs the DC power to the non-contact charging circuit 42. The AC adapter 41 and other elements may be provided in separate housings, and the AC adapter 41 and the non-contact charging circuit 42 may be connected via a power cable.

  As illustrated in FIG. 2, the non-contact charging circuit 42 includes a conversion circuit 421 and an authentication unit 422. The conversion circuit 421 converts the DC power output from the AC adapter 41 into predetermined AC power and outputs it to the coil 43. Further, in accordance with an instruction from the controller 45, the power supply to the coil 43 is switched on / off. The authentication unit 422 communicates with the battery pack 2 through the coil 43 in accordance with an instruction from the control unit 45 and performs authentication for permitting power supply to the battery pack 2. Then, the controller 45 is notified of the authenticated result.

  The coil 43 functions as a primary coil that discharges AC power output from the non-contact charging circuit 42 as electromagnetic energy. The temperature detection unit 44 detects the temperature inside the non-contact charger 4 and notifies the control unit 45 of the detection result.

  The control unit 45 controls the operation of the non-contact charging circuit 42. If the temperature detection result input from the temperature detection unit 44 is equal to or higher than a predetermined temperature, the conversion circuit 421 supplies power to the coil 43. Set it to off.

  The battery pack 2 includes a coil 21, a non-contact charging circuit 22, a protection circuit 23, a battery cell 24, and a battery control unit 25. Further, the battery pack 2 is electrically connected to the mobile phone 1a through the terminal CH, the terminal T, the terminal +, and the terminal −. Note that the terminal + and the terminal − function as an example of a power supply terminal for supplying power to the battery cell 24.

  The coil 21 functions as a secondary coil that is electromagnetically coupled with the coil 43 provided in the contactless charger 4 and receives power supply, and outputs the supplied AC power to the contactless charging circuit 22. .

  As illustrated in FIG. 3, the non-contact charging circuit 22 includes a rectifier circuit 221, a regulator 222, and an authentication unit 223. The rectifier circuit 221 converts AC power output from the coil 21 into DC power and outputs the DC power to the regulator 222. The regulator 222 is connected between the output of the rectifier circuit 221 and the terminal CH, and outputs the DC power output from the rectifier circuit 221 to the terminal CH. The supply of DC power to the terminal CH is switched on / off in accordance with an instruction from the battery control unit 25. The authentication unit 223 communicates with the non-contact charger 4 via the coil 21 in accordance with an instruction from the control unit 25 and performs authentication for permitting power supply from the non-contact charger 4. Then, the battery control unit 25 is notified of the authenticated result.

  The protection circuit 23 supplies the battery cell 24 with the power received from the terminal + and the terminal − of the mobile phone 1 a and charges it. Further, the protection circuit 23 has a temperature detector and an overcurrent detector, monitors the charge state of the battery cell 24, detects the high temperature and overcurrent, and determines that an abnormality has occurred, the battery cell 24 Stop charging. An abnormality detection signal when an abnormality is detected is output to the battery control unit 25 and is also output to the mobile phone 1b via the terminal T.

  The battery cell 24 functions as an example of a secondary battery that is charged via the protection circuit 23 and can be repeatedly charged and discharged.

  The battery control unit 25 controls the operation of the non-contact charging circuit 22, and when abnormality is detected in the charging state by the protection circuit 23, the power supply to the terminal CH in the regulator 222 is set to off. .

  The mobile phone 1a includes an external connection terminal 11, an external connection terminal 11, a connection detection unit 12, a switching circuit 13, a charging circuit 14, and a control unit 15.

  The terminal CH functions as an example of a first power input unit to which the power supplied from the non-contact charger 4 is input, and the DC power converted by the non-contact charging circuit 22 of the battery pack 2. Is entered.

  The external connection terminal 11 functions as an example of a second power input unit to which power supplied from the contact charger 3 is input, and directly contacts the power supply terminal 32 of the contact charger 3. Thus, DC power is input from the contact charger 3.

  The connection detection unit 12 detects whether or not power from the external connection terminal 11 has been input, and outputs it to the switching circuit 13. As an example of the configuration of the connection detection unit 12, as shown in FIG. 1, a pull-down resistor R having a PMOS transistor 121, whose gate and source are connected to the external connection terminal 11, and whose drain is grounded at one end. Are connected at multiple ends. The drain outputs a low level signal when the power supply terminal 32 of the contact charger 3 is not connected to the external connection terminal 11, and outputs a high level signal when the voltage changes.

  The switching circuit 13 selects one of the two terminals a and b based on the selection signal from the connection detection unit 12 and connects to the charging circuit 14. The terminal a is connected to the terminal CH, and the terminal b is connected to the external connection terminal 11. The switching circuit 13 selects the terminal a when the output from the connection detection unit 12 is a low level signal, and selects the terminal b when the output is a high level signal. The connection detection unit 12 and the switching circuit 13 function as an example of a power input selection unit.

  The charging circuit 14 receives power from the switching circuit 13 and controls charging of the battery cell 24 of the battery pack 2 via the terminal + and the terminal −. For example, the voltage is controlled so that a predetermined voltage is applied to the battery cell 24, and the charging current is monitored, and the charging is controlled to stop when the battery cell 24 becomes a predetermined current or less. In addition, the controller 15 is notified of the state of charge of the rechargeable battery. In addition, since the charging circuit 14 serves as both inputs from the non-contact type and the contact type charger, it is possible to prevent an increase in size and cost of the mobile phone 1a.

  The control unit 15 controls the overall operation of the mobile phone 1a, and is mainly composed of a processor that operates according to a predetermined program. The control unit 15 monitors the state of the charging circuit 14 and controls the start / stop of charging of the charging circuit 14.

  Next, the operation of the mobile phone 1a of this embodiment will be described. FIG. 4 is a flowchart for explaining the operation of the mobile phone according to the first embodiment of the present invention.

  As shown in FIG. 4, the connection detection unit 12 monitors whether or not power is supplied to the external connection terminal 11 (step S101). When it is detected that power is supplied to the external connection terminal 11 (YES in Step S101), the switching circuit 13 selects the terminal b and connects the external connection terminal 11 and the charging circuit 14 ( Step S102). The charging circuit 14 receives power supply via the external connection terminal 11 (step S103).

  The control unit 15 recognizes the charging power input from the charging circuit 14 (step S104), starts charging the battery pack 2 (step S105), and the power supplied to the external connection terminal 11 is changed to the switching circuit 13, The battery cell 24 is supplied and charged through the charging circuit 14 and the protection circuit 23.

  If it is not detected in step S101 that power is supplied to the external connection terminal 11 (NO in step S101), the switching circuit 13 selects the terminal a and connects the terminal CH and the charging circuit 14 ( Step S107).

  When the mobile phone 1a is installed in the contactless charger 4 (YES in step S108), the charging circuit 14 receives power supply via the coil 21, the contactless charging circuit 22, and the terminal CH (step S109). ). Then, charging is started in the same manner as in steps S104 to S106.

  The installation on the non-contact charger 4 may be detected by providing a manual switch or a sensor for detecting the installation on the mobile phone 1a, or a manual switch or installation on the non-contact charger 4. May be detected by the battery control unit 25 via the authentication unit 223 by sending a signal requesting the start of authentication from the authentication unit 422 via the coil 43. .

  When it is detected that it is installed in the non-contact charger 4, authentication is performed between the authentication unit 223 and the authentication unit 422, and the establishment of authentication is confirmed in the non-contact charger 4. Then, power supply from the non-contact charger 4 is started. As an authentication method, identification information including information such as its own charging method is transmitted from the authentication unit 223 via the coil 21, and the authentication unit 422 analyzes the identification information to determine whether authentication is established or not established. judge.

  On the other hand, in step S108, if the mobile phone 1a is not installed in the non-contact charger 4 (NO in step S108), the mobile phone 1a is not supplied with power and is not charged.

  According to the first embodiment of the present invention, it is possible to support both contact type and non-contact type charging methods, and since only one of the charging methods is selected, Even when power is input from both power input units at once, charging can be performed safely.

(Second Embodiment)
FIG. 5 is a sequence chart for explaining the outline of the charging system according to the second embodiment of the present invention. The charging system of the present embodiment is the same as the configuration described in the first embodiment except that the operations of the authentication unit 223 and the battery control unit 25 of the non-contact charging circuit 22 are different. Description is omitted.

  When the mobile phone 1a is installed in the contactless charger 4, the authentication unit 223 transmits identification information to the contactless charger 4 via the coil 21 (step S211). In the non-contact charger 4, the authentication unit 422 analyzes the identification information received via the coil 43 (step S212). If the authentication is not established (NO in step S212), the control unit 45 is notified that the authentication is not established, and the control unit 45 sets the power supply state from the conversion circuit 421 to the mobile phone 1a to off, The battery is not charged (step S213).

  On the other hand, when the authentication is established (YES in step S212), the authentication unit 422 notifies the control unit 45 that the authentication is established, and the control unit 45 sets the power supply state from the conversion circuit 421 to the mobile phone 1a to on. Then, charging is started (step S214).

  Even after the start of charging, the authentication unit 223 of the battery pack 2 transmits identification information every predetermined time (step S202). The authentication unit 422 of the non-contact charger 4 analyzes the transmitted identification information and continues to supply power while authentication is established. In the battery pack 2, the protection circuit 23 monitors the abnormality and continues charging while no abnormality is detected (NO in step S203).

  When an abnormality is detected in the protection circuit (YES in step S203), the battery control unit 25 transmits information indicating that authentication is not established from the authentication unit 223 to the non-contact charging circuit 42, and authentication in the authentication unit 223 is performed. Is not established.

  The authentication unit 422 of the non-contact charger 4 transmits information indicating that the authentication is not established. Therefore, when the identification information is analyzed (step S215), the authentication is not established. Based on the result of the authentication failure in authentication unit 422, control unit 45 sets the power supply state from conversion circuit 421 to mobile phone 1a to off, and stops charging (step S216).

  According to the second embodiment of the present invention, since the authentication with the non-contact charger 4 is not established when an abnormality occurs in the battery pack 2, power is supplied to the non-contact charger 4. It is possible to recognize a situation that should not be performed, suppress unnecessary power supply, and reduce power consumption in the non-contact charger 4.

  When the authentication is performed by making an authentication request from the authentication unit 422 of the non-contact charger 4 and returning a response to the authentication request from the authentication unit 223 of the battery pack 2, the protection circuit As a method for making authentication unsuccessful when an abnormality is detected at 23, authentication part 422 may determine that authentication is unsuccessful by not returning an authentication response at authentication part 223.

  In addition, the mobile phone to which the battery pack described in the second embodiment is attached is not necessarily compatible with the contact-type charging method. In that case, the external connection terminal 11, the connection detection unit 12, and the switching circuit 13 shown in FIG. 1 are unnecessary, and the terminal CH of the battery pack and the charging circuit are directly connected.

(Third embodiment)
FIG. 6 is a block diagram showing a main configuration of a mobile phone according to the third embodiment of the present invention. In FIG. 6, the same reference numerals are given to the portions overlapping those in FIG. 1 described in the first embodiment. The operations of the battery control unit 25 and the non-contact charging circuit 22 are the same as those described in the second embodiment.

  As shown in FIG. 6, the mobile phone 1 b of this embodiment includes an abnormality detection circuit 16. The abnormality detection circuit 16 monitors an abnormality in the mobile phone 1b such as the charging circuit 14 according to an instruction from the control unit 15, and when an abnormality is detected, the abnormality detection circuit 16 charges the protection circuit 23 via the terminal T A control signal for recognizing that an abnormality has occurred is output.

  Since the protection circuit 23 is in a state of detecting an abnormality when a control signal from the abnormality detection circuit 16 is input via the terminal T, YES in step S203 in FIG. 5 described in the second embodiment and Similarly to step S <b> 204, the supply of power by the non-contact charger 4 can be stopped by disabling the authentication with the non-contact charger 4.

  According to the third embodiment of the present invention as described above, even when an abnormality occurs on the mobile phone 1b side, authentication is not established in the same manner as in the state in which the abnormality is detected in the protection circuit 23, so that the non-contact type It is possible to recognize a situation where power should not be supplied in the charger 4, suppress unnecessary power supply, and reduce power consumption in the contactless charger 4.

Electronic equipment, non-contact charger and the non-contact charging system of the present invention, contact type and has a non-contact both possible effect corresponding to the charging method of the useful in cellular phones.

The block diagram explaining the outline | summary of the charging system which concerns on the 1st Embodiment of this invention. The block diagram which shows the main structures of the non-contact charging circuit of the non-contact charging type electric appliance which concerns on the 1st Embodiment of this invention. The block diagram which shows the main structures of the non-contact charging circuit of the mobile telephone which concerns on the 1st Embodiment of this invention The flowchart explaining operation | movement of the mobile telephone based on the 1st Embodiment of this invention. The sequence chart explaining the outline | summary of the charging system which concerns on the 2nd Embodiment of this invention The block diagram which shows the main structures of the mobile telephone based on the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Cellular phone 2 Battery pack 3 Contact type charger 4 Non-contact type charger 11 External connection terminal 12 Connection detection part 13 Switching circuit 14 Charging circuit 15 Control part 16 Abnormality detection circuit 21 Coil 22 Non-contact charge circuit 23 Protection circuit 24 battery cell 25 battery control unit 31 AC adapter 32 power supply terminal 41 AC adapter 42 non-contact charging circuit 43 coil 44 temperature detection unit 45 control unit 51, 52 AC power supply

Claims (6)

A secondary battery capable of charging the power supplied from the contactless charger;
A protection circuit for monitoring a charge state of the secondary battery;
An authentication unit that performs communication with the non-contact charger and performs authentication for permitting power supply from the non-contact charger, and an electronic device comprising:
The authentication unit transmits identification information to the contactless charger every predetermined time, and when the protection circuit detects an abnormality in a charged state, information indicating that authentication is not established is transmitted to the contactless charger. To send electronic equipment. The electronic device according to claim 1, further comprising a coil that is electromagnetically coupled to the contactless charger and receives power.
The said authentication part is an electronic device which transmits the said identification information and the information by which the said authentication is not materialized to the said non-contact-type charger via the said coil. 3. The electronic apparatus according to claim 1, wherein the identification information includes information on a charging method. The electronic device according to claim 1, wherein the secondary battery can be charged with electric power supplied from a contact charger. An authentication unit that performs communication with an electronic device and performs authentication for permitting power supply to the electronic device;
A control unit that controls whether to supply power to the electronic device, and a non-contact charger,
The authentication unit receives identification information from the electronic device every predetermined time, and when the abnormality is detected in the state of charge of the electronic device, information transmitted from the electronic device is not established. And performing authentication of the electronic device based on the identification information and information on which the authentication is not established,
The said control part is a non-contact-type charger which performs control which turns off the electric power supply to the said electronic device, when the authentication with the said electronic device is not materialized by the said authentication part. A non-contact charging system comprising: the electronic device according to any one of claims 1 to 4; and the non-contact charger according to claim 5.

Images