CN211655727U - Overvoltage detection device and air conditioner indoor unit - Google Patents
Overvoltage detection device and air conditioner indoor unit Download PDFInfo
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- CN211655727U CN211655727U CN201922178621.XU CN201922178621U CN211655727U CN 211655727 U CN211655727 U CN 211655727U CN 201922178621 U CN201922178621 U CN 201922178621U CN 211655727 U CN211655727 U CN 211655727U
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 230000007306 turnover Effects 0.000 claims abstract description 5
- 238000004146 energy storage Methods 0.000 claims description 30
- 238000001914 filtration Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000004378 air conditioning Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
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Abstract
The utility model provides an interior machine of excessive pressure detection device and air conditioning, this excessive pressure detection device includes: the rectification module is connected between a live wire L and a zero line N of an input alternating current power supply and is used for converting an input alternating current signal into a direct current signal; the overvoltage detection module comprises a voltage division unit, a detection unit and a switch unit, the voltage division unit is connected with the output end of the rectification module, the detection unit is respectively connected with the voltage division unit and the switch unit, the detection unit comprises an optocoupler, the voltage division unit is used for detecting a voltage sampling value of the direct current signal, and the switch unit is used for outputting a level signal to turn over when the voltage value is greater than a voltage threshold value; and the control module is connected with the output end of the switch unit and responds to the level overturning signal to control the power supply to suspend supplying power for the load. The utility model discloses an overvoltage detection device cuts off the load power supply through control module when overvoltage detection module detects high-voltage signal input to the protection load avoids appearing the device and damages, improves the safety in utilization.
Description
Technical Field
The utility model belongs to the technical field of the air conditioner control and specifically relates to an machine in overvoltage detection device and air conditioning.
Background
In many areas with large voltage fluctuation or two mains supply voltages, the electric appliances have the risk of high-voltage work, and when the voltage fluctuation is large, the situation of extremely high voltage is easy to occur; in two mains supply areas, such as north america, japan and mexico, it is easy to connect low voltage products to high voltage power supplies, and when the voltage is too high, the output load of the appliance and the subsequent circuits may be damaged during the connection, and even a safety risk may occur.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide an overvoltage detecting device, which can cut off the power supply when detecting high voltage input, protect the load, and improve the safety.
A second object of the present invention is to provide an indoor unit of an air conditioner.
In order to achieve the above object, a first aspect of the present invention provides an overvoltage detection device, including a rectification module connected between a live line L and a zero line N of an input ac power source, for converting an input ac signal into a dc signal; the overvoltage detection module comprises a voltage division unit, a detection unit and a switch unit, the voltage division unit is connected with the output end of the rectification module, the detection unit is respectively connected with the voltage division unit and the switch unit, the detection unit comprises an optical coupler, the voltage division unit is used for detecting a voltage sampling value of the direct current signal, the optical coupler is used for transmitting the voltage sampling value, and the switch unit is used for outputting a level signal to turn over when the voltage sampling value is greater than a voltage threshold value; and the control module is connected with the output end of the switch unit and responds to the level overturning signal to control the power supply to suspend supplying power for the load.
According to the utility model discloses overvoltage detection device, based on rectifier module, overvoltage detection module and control module's frame, alternating current signal conversion who will input through rectifier module is the direct current signal, overvoltage detection module detects this direct current signal's voltage acquisition value, when voltage acquisition value is greater than the voltage threshold, explain the voltage of input too high, at this moment, output level signal upset, and use control module control power pause to supply power for the load, with the protection load, avoid voltage too high and harm output load and back level circuit device, the security is improved, the risk of electrical apparatus high pressure work has been reduced, the security of electrical apparatus use has been improved.
In some embodiments, the rectifier module comprises: the first input end of the rectifier bridge unit is connected with a live wire L of the alternating current power supply, and the second input end of the rectifier bridge unit is connected with a zero line N of the alternating current power supply, and is used for rectifying an input alternating current signal and outputting a direct current signal;
and the first end of the energy storage filtering unit is connected with the first output end of the rectifier bridge unit, and the second end of the energy storage filtering unit is connected with the second output end of the rectifier bridge unit and is used for filtering the direct current signal.
In some embodiments, the rectifier bridge unit includes: the first end of the first diode is connected with the first end of the second diode and then connected with the live wire L; the first end of the third diode is connected with the first end of the fourth diode and then connected with the zero line N, the second end of the first diode is connected with the second end of the fourth diode and then connected with the first end of the energy storage filtering unit, and the second end of the second diode is connected with the second end of the third diode and then connected with the second end of the energy storage filtering unit.
In some embodiments, the energy storage filtering unit includes one of an inductor and a charging capacitor.
In some embodiments, a first end of the voltage dividing unit is connected to the first end of the energy storage filtering unit and a first preset power supply, respectively, and a second end of the voltage dividing unit is connected to the second end of the energy storage filtering unit, and is configured to collect a voltage sampling value of the direct current signal; the first input end of the detection unit is connected with the third end of the voltage division unit, the second input end of the detection unit is connected with the second end of the voltage division unit, and the first output end of the detection unit is connected with a second preset power supply and used for transmitting the voltage sampling value; the input end of the switch unit is connected with the second output end of the detection unit, and the output end of the switch unit is connected with the control module and used for outputting level signal turnover when the voltage sampling value is larger than the voltage threshold value.
In some embodiments, the voltage dividing unit includes: the energy storage filter unit comprises a first resistor and a second resistor, wherein one end of the first resistor is respectively connected with a first end of the energy storage filter unit and a first preset power supply, a second end of the first resistor is connected with a first end of the second resistor, a second end of the second resistor is connected with a second end of the energy storage filter unit, and a first node is arranged between the second end of the first resistor and the first end of the second resistor.
In some embodiments, the detection unit comprises: a voltage regulator tube, a first end of which is connected with the first node; a first end of the third resistor is connected with a second end of the voltage regulator tube, and a second end of the third resistor is connected with a second end of the second resistor; the first input end of the optical coupler is connected with the second end of the voltage stabilizing tube respectively, the second input end of the optical coupler is connected with the second end of the third resistor, the first output end of the optical coupler is connected with the second preset power supply, and the second output end of the optical coupler is connected with the switch unit; and a first end of the fifth resistor is connected with a second output end of the optocoupler, and a second end of the fifth resistor is grounded.
In some embodiments, the switching unit includes: a first end of the fourth resistor is connected with a second output end of the optocoupler; a control end of the switch tube is connected with a second end of the fourth resistor, a first end of the switch tube is connected with the second preset power supply through a sixth resistor, a second end of the switch tube is grounded, a seventh resistor is connected with the sixth resistor and the first end of the switch tube, and a second end of the seventh resistor is connected with the control module; and a first end of the second capacitor is connected with a second end of the seventh resistor, and a second end of the second capacitor is grounded.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides an indoor unit of an air conditioner, including the overvoltage detecting device mentioned in the above embodiment.
According to the utility model discloses machine in air conditioning through adopting the excessive pressure detection device that the above-mentioned embodiment mentioned, can cut off the load power supply when detecting there is high pressure input to the security that the air conditioner used has been improved to the protection load.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of an overvoltage detection device according to an embodiment of the present invention;
fig. 2 is a schematic view of an overvoltage detection device according to an embodiment of the invention;
fig. 3 is a schematic diagram of an input voltage according to an embodiment of the present invention;
fig. 4 is a schematic diagram of rectified voltage according to an embodiment of the present invention;
fig. 5 is a schematic diagram of low level detection according to an embodiment of the present invention;
fig. 6 is a block diagram of an air conditioning indoor unit according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, and the embodiments described with reference to the drawings are exemplary and are described in detail below.
In order to solve the above problem, an overvoltage detection device according to an embodiment of the present invention is described below with reference to fig. 1 to 5, as shown in fig. 1, an overvoltage detection device 1 according to an embodiment of the present invention includes a rectification module 10, an overvoltage detection module 20, and a control module 30.
The rectifier module 10 is connected between a live line L and a zero line N of an input alternating current power supply, and is used for converting an input alternating current signal into a direct current signal; the overvoltage detection module 20 is arranged at the output end of the rectification module, and is used for collecting a voltage sampling value of the direct current signal and outputting a level signal to be turned over when the voltage sampling value is greater than a voltage threshold value; the control module 30 is connected to the output of the overvoltage detection module 20 and controls the power supply to suspend supplying power to the load in response to the level-reversal signal.
Specifically, in an area with large voltage fluctuation or two mains voltages, the air conditioner is prone to high-voltage operation risk, and in order to ensure safe use, the overvoltage detection device 1 detects the input voltage, wherein the rectification module 10 converts the input ac signal into a dc signal, and detects a dc voltage sampling value after conversion by using the overvoltage detection device 20, when the dc voltage sampling value exceeds a voltage threshold value, for example, when the sampling voltage value reaches U ═ R (R1+ R2) (V1+0.7)/R2, the input ac signal is indicated as a high-voltage signal, and a level signal is output to be inverted, for example, from a high level to a low level, the control module 30 receives the level inversion signal, controls the power supply to suspend power supply to the relevant load, so as to protect the load and avoid damage of the subsequent circuit device, and improve the safety of the air conditioner in use, and when the input voltage is normal, the power supply is recovered to supply power to the load.
According to the utility model discloses overvoltage detection device 1, based on rectifier module, overvoltage detection module and control module's frame, alternating current signal conversion who inputs is direct current signal through rectifier module 10, and detect this direct current signal's voltage sampling value through overvoltage detection module 20, when the voltage sampling value is greater than the voltage threshold value, explain the voltage of input too high, at this moment, output level signal upset, and use control module 30 control power pause to supply power for the load, with the protection load, avoid voltage too high and harm output load and back level circuit device, the safety is improved, the risk of electrical apparatus high pressure work has been reduced, the security of electrical apparatus use has been improved.
In some embodiments, as shown in fig. 2, the overvoltage detection device according to an embodiment of the present invention is schematically illustrated. The rectifier module 10 includes a rectifier bridge unit 110, a first input end of the rectifier bridge unit 110 is connected to a live line L of an ac power supply, and a second input end of the rectifier bridge unit 110 is connected to a zero line N of the ac power supply, and is configured to rectify an input ac signal and output a dc signal; and a first end of the energy storage filtering unit 120 is connected to a first output end of the rectifier bridge unit, and a second end of the energy storage filtering unit 120 is connected to a second output end of the rectifier bridge unit 110, so as to filter the direct current signal.
Specifically, the rectifier bridge unit 110, for example, a rectifier stack bridge, rectifies an input ac electrical signal, where the input ac electrical signal is as shown in fig. 3, the ac electrical signal passes through the rectifier unit 110 to output a dc electrical signal, and the energy storage filter unit 120, for example, an inductor, a charging capacitor, etc., receives the dc electrical signal and filters the dc electrical signal to further remove ac components in the rectified dc electrical signal, which is as shown in fig. 4, the rectified dc electrical signal. Namely, the rectifier bridge unit 110 and the energy storage filter unit 120 complete the conversion from the ac signal to the dc signal.
In some embodiments, the rectifier bridge unit 110 includes a first diode and a second diode, and a first end of the first diode is connected to a first end of the second diode and then connected to the live line L; the first end of the third diode is connected with the first end of the fourth diode and then connected with the zero line N, the second end of the first diode is connected with the second end of the fourth diode and then connected with the first end of the energy storage filtering unit, and the second end of the second diode is connected with the second end of the third diode and then connected with the second end of the energy storage filtering unit, so that the third diode and the fourth diode are used for rectifying an input alternating current signal and then outputting a direct current signal.
In some embodiments, as shown in fig. 2, the overvoltage detection module 20 includes a voltage dividing unit 210, a first end of the voltage dividing unit 210 is respectively connected to a first end of the energy storage filtering unit 120 and a first preset power DC, and a second end of the voltage dividing unit 210 is connected to a second end of the energy storage filtering unit 120, and is configured to collect a voltage value of the DC electrical signal; a first input end of the detection unit 220 is connected with the third end of the voltage dividing unit 210, a second input end of the detection unit 220 is connected with the second end of the voltage dividing unit 210, and a first output end of the detection unit 220 is connected with a second preset power source VCC and used for transmitting a voltage value; the input end of the switch unit 230 is connected to the second output end of the detection unit 220, the output end of the switch unit 230 is connected to the control module 30, and the control module 30 may be a control chip, and is configured to output a level signal for inversion when the voltage value is greater than the voltage threshold.
Specifically, the voltage dividing unit 210 receives a voltage value of the dc signal, divides the voltage value to obtain a voltage sampling value of the dc signal, that is, a divided voltage value, and the detecting unit 220 detects and transmits the divided voltage value. The switch unit 230 detects the voltage value, when the voltage value reaches a voltage threshold, the output level signal is inverted, the control module 30 receives the level inversion signal, and controls the power supply to suspend to supply power to the load, so as to protect the load, and avoid the situation that the load, i.e., a rear-stage circuit, is damaged by devices, and a safety problem occurs.
In some embodiments, the voltage dividing unit 210 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the first end of the energy storage filter unit 120 and the first preset power DC, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the second end of the energy storage filter unit 120, and a first node is located between the second end of the first resistor R1 and the first end of the second resistor R2.
Specifically, the first resistor R1 and the second resistor R2 form a voltage divider circuit in series to divide the voltage value of the dc signal to obtain a sampling voltage value, and a voltage calculation formula at a connection point between the second end of the first resistor R1 and the first end of the second resistor R2 after voltage division, that is, at the first node, is: v ═ R2/(R1+ R2) × U, where U is the rectified dc voltage value.
Further, the detecting unit 220 comprises a voltage regulator V1, a first end of the voltage regulator V1 is connected with the first node; a first end of a third resistor R3, a first end of the third resistor R3 is connected with a second end of the V1 voltage regulator tube, and a second end of the third resistor R3 is connected with a second end of the second resistor R2; a first input end of the optical coupler B1, a first input end of the optical coupler B1 are connected with a second end of the voltage regulator tube V1 respectively, a second input end of the optical coupler B1 is connected with a second end of a third resistor R3, a first output end of the optical coupler B1 is connected with a second preset power supply VCC, and a second output end of the optical coupler B1 is connected with the switch unit 230; and a first end of an R5 of the fifth resistor R5 is connected with a second output end of the optocoupler B1, and a second end of the fifth resistor R5 is grounded.
Specifically, when the divided voltage value reaches the threshold value of the voltage regulator V1, for example, V1+0.7V, the optocoupler B1 is turned on, and outputs a high level at the second output end of the optocoupler B1, and the resistor R5 is enabled to provide a bias current for the optocoupler B1.
Further, the switching unit 230 includes a fourth resistor R4, a first end of the fourth resistor R4 is connected to a second output terminal of the optocoupler B1; a control end of the switching tube V2 is connected with a second end of the fourth resistor R4, a first end of the switching tube V2 is connected with a second preset power source VCC through a sixth resistor R6, and a second end of the switching tube V2 is grounded; a seventh resistor R7, wherein a first end of the seventh resistor R7 is connected to the sixth resistor R6 and a first end of the switching tube V2, respectively, and a second end of the seventh resistor R7 is connected to the control module 30; a first end of the second capacitor C2, a first end of the second capacitor C2 is connected to a second end of the seventh resistor R7, and a second end of the second capacitor C2 is grounded.
Specifically, after opto-coupler B1 switches on, after its magnitude of voltage reached switch tube V2's conduction voltage, be greater than voltage threshold value promptly, switch tube V2 output level signal upset, and switch element 230 outputs low level signal to control module 30, and fig. 5 shows, does the utility model discloses a low level detects the schematic diagram. After detecting the low level signal, the control module 30 controls the power supply to stop supplying power to the load, and displays the fault information, for example, sends an alarm to remind the customer to protect the load, and when the fault disappears, the normal operation is resumed. When the dc voltage does not reach the turn-on voltage of the switching tube V2, a high level signal is output to the control module 30, and the control module 30 does not respond if it cannot detect a low level signal.
In summary, according to the utility model discloses overvoltage detection device 1, rectifier module 110 converts the alternating current signal of input into direct current signal, and gather this direct current signal's voltage acquisition value through overvoltage detection module 120, when voltage acquisition value is greater than the voltage threshold value, it is too high to explain the voltage of input, then, output level signal upset, and use control module 130 control power pause to supply power for the load, with the protection load, avoid too high and harm output load and back stage circuit of input voltage, and then the safety risk appears, the risk of electrical apparatus high pressure work has been reduced, the security of electrical apparatus use has been improved.
Based on the overvoltage detection device of the above embodiment, an air conditioning indoor unit according to a second aspect of the embodiment of the present invention is described below with reference to the drawings.
Fig. 6 is an air-conditioning indoor unit according to an embodiment of the present invention, as shown in fig. 5, an air-conditioning indoor unit 40 according to an embodiment of the present invention includes the overvoltage detecting device 1 mentioned in the above embodiment.
According to the utility model discloses machine 40 in air conditioning through adopting the excessive pressure detection device 1 that the above-mentioned embodiment mentioned, can cut off the load power supply when detecting there is high pressure input to protect the load, improved the security that the air conditioner used.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. An overvoltage detection device, comprising:
the rectification module is connected between a live wire L and a zero line N of an input alternating current power supply and is used for converting an input alternating current signal into a direct current signal;
the overvoltage detection module comprises a voltage division unit, a detection unit and a switch unit, the voltage division unit is connected with the output end of the rectification module, the detection unit is respectively connected with the voltage division unit and the switch unit, the detection unit comprises an optical coupler, the voltage division unit is used for detecting a voltage sampling value of the direct current signal, the optical coupler is used for transmitting the voltage sampling value, and the switch unit is used for outputting a level signal to turn over when the voltage sampling value is greater than a voltage threshold value;
and the control module is connected with the output end of the switch unit and responds to the level overturning signal to control the power supply to suspend supplying power for the load.
2. The overvoltage detection device of claim 1, wherein the rectification module comprises:
the first input end of the rectifier bridge unit is connected with a live wire L of the alternating current power supply, and the second input end of the rectifier bridge unit is connected with a zero line N of the alternating current power supply, and is used for rectifying an input alternating current signal and outputting a direct current signal;
and the first end of the energy storage filtering unit is connected with the first output end of the rectifier bridge unit, and the second end of the energy storage filtering unit is connected with the second output end of the rectifier bridge unit and is used for filtering the direct current signal.
3. The overvoltage detection device according to claim 2, wherein the rectifier bridge unit comprises:
the first end of the first diode is connected with the first end of the second diode and then connected with the live wire L;
the first end of the third diode is connected with the first end of the fourth diode and then connected with the zero line N, the second end of the first diode is connected with the second end of the fourth diode and then connected with the first end of the energy storage filtering unit, and the second end of the second diode is connected with the second end of the third diode and then connected with the second end of the energy storage filtering unit.
4. The overvoltage detection device according to claim 2, wherein the energy storage filter unit comprises one of an inductor and a charging capacitor.
5. The overvoltage detection device according to any one of claims 2 to 4, wherein a first end of the voltage division unit is connected to the first end of the energy storage filter unit and a first preset power supply, respectively, and a second end of the voltage division unit is connected to the second end of the energy storage filter unit, and is configured to detect a voltage sampling value of the direct current signal;
the first input end of the detection unit is connected with the third end of the voltage division unit, the second input end of the detection unit is connected with the second end of the voltage division unit, and the first output end of the detection unit is connected with a second preset power supply and used for transmitting the voltage sampling value;
the input end of the switch unit is connected with the second output end of the detection unit, and the output end of the switch unit is connected with the control module and used for outputting level signal turnover when the voltage sampling value is larger than the voltage threshold value.
6. The overvoltage detection device according to claim 5, wherein the voltage dividing unit includes:
the energy storage filter unit comprises a first resistor and a second resistor, wherein one end of the first resistor is respectively connected with a first end of the energy storage filter unit and a first preset power supply, a second end of the first resistor is connected with a first end of the second resistor, a second end of the second resistor is connected with a second end of the energy storage filter unit, and a first node is arranged between the second end of the first resistor and the first end of the second resistor.
7. The overvoltage detection device according to claim 6, wherein the detection unit comprises:
a voltage regulator tube, a first end of which is connected with the first node;
a first end of the third resistor is connected with a second end of the voltage regulator tube, and a second end of the third resistor is connected with a second end of the second resistor;
the first input end of the optical coupler is connected with the second end of the voltage stabilizing tube respectively, the second input end of the optical coupler is connected with the second end of the third resistor, the first output end of the optical coupler is connected with the second preset power supply, and the second output end of the optical coupler is connected with the switch unit;
and a first end of the fifth resistor is connected with a second output end of the optocoupler, and a second end of the fifth resistor is grounded.
8. The overvoltage detection device according to claim 7, wherein the switching unit comprises:
a first end of the fourth resistor is connected with a second output end of the optocoupler;
the control end of the switch tube is connected with the second end of the fourth resistor, the first end of the switch tube is connected with the second preset power supply through a sixth resistor, and the second end of the switch tube is grounded;
a first end of the seventh resistor is connected with the sixth resistor and the first end of the switching tube respectively, and a second end of the seventh resistor is connected with the control module;
and a first end of the second capacitor is connected with a second end of the seventh resistor, and a second end of the second capacitor is grounded.
9. An indoor unit of an air conditioner, comprising the overvoltage detecting device as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922178621.XU CN211655727U (en) | 2019-12-06 | 2019-12-06 | Overvoltage detection device and air conditioner indoor unit |
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| CN201922178621.XU CN211655727U (en) | 2019-12-06 | 2019-12-06 | Overvoltage detection device and air conditioner indoor unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948442A (en) * | 2020-08-07 | 2020-11-17 | 珠海格力电器股份有限公司 | Voltage detection circuit, voltage detection method and electric equipment |
| CN114001439A (en) * | 2021-11-30 | 2022-02-01 | 海信（广东）空调有限公司 | Air conditioner and control device and method thereof |
| CN114140981A (en) * | 2021-11-29 | 2022-03-04 | 广东电网有限责任公司 | Safety warning device for power distribution network |
-
2019
- 2019-12-06 CN CN201922178621.XU patent/CN211655727U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948442A (en) * | 2020-08-07 | 2020-11-17 | 珠海格力电器股份有限公司 | Voltage detection circuit, voltage detection method and electric equipment |
| CN114140981A (en) * | 2021-11-29 | 2022-03-04 | 广东电网有限责任公司 | Safety warning device for power distribution network |
| CN114001439A (en) * | 2021-11-30 | 2022-02-01 | 海信（广东）空调有限公司 | Air conditioner and control device and method thereof |
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