CN113114022A - Resistance control module, power output circuit and air conditioner - Google Patents
Resistance control module, power output circuit and air conditioner Download PDFInfo
- Publication number
- CN113114022A CN113114022A CN202110373131.4A CN202110373131A CN113114022A CN 113114022 A CN113114022 A CN 113114022A CN 202110373131 A CN202110373131 A CN 202110373131A CN 113114022 A CN113114022 A CN 113114022A
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- thermistor
- resistance control
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- 238000002955 isolation Methods 0.000 claims description 47
- 239000003507 refrigerant Substances 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 230000001131 transforming effect Effects 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 1
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 12
- 239000001294 propane Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010892 electric spark Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 101100027017 Caenorhabditis elegans ntc-1 gene Proteins 0.000 description 1
- 101100100146 Candida albicans NTC1 gene Proteins 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a resistance control module, a power output circuit and an air conditioner, and relates to the technical field of air conditioners. The resistance control module, the power output circuit and the air conditioner provided by the invention have the advantages of high efficiency, high safety and low cost.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a resistance control module, a power output circuit and an air conditioner.
Background
In the current air conditioner, an NTC (Negative Temperature Coefficient) resistor is added to a power output circuit, which is used for limiting surge current during startup, so as to play a role in limiting current and prevent large current from damaging devices in the startup moment.
In summary, in the prior art, there is a problem that the NTC resistor consumes power when the air conditioner is in operation, resulting in a decrease in efficiency.
Disclosure of Invention
The invention aims to provide a resistance control module, a power output circuit and an air conditioner, and aims to solve the problem that in the prior art, when the air conditioner runs, an NTC resistor consumes power, so that the efficiency is reduced.
In order to solve the above problems, in a first aspect, the present application provides a resistance control module, which is applied to a power output circuit, the power output circuit includes a thermistor, the resistance control module includes a controller, a driving unit and an isolation unit, the controller is electrically connected to the driving unit, the driving unit is electrically connected to the isolation unit, the isolation unit is further electrically connected to the thermistor, wherein,
the controller is used for controlling the isolation unit to be in a conducting state or a switching-off state through the driving unit, and when the isolation unit is in the conducting state, the thermistor is short-circuited.
On the first hand, through the arranged resistance control module, when the air conditioner is started, the controller can control the isolation unit to be not conducted, so that the thermistor normally works and the current limiting function is achieved. After the air conditioner is started, the controller can control the isolation unit to be in a conducting state, so that the thermistor is short-circuited, power consumption of the thermistor is not generated, and efficiency is improved. In the second aspect, because the isolation unit is electrically connected with the thermistor in the resistor control module, and because the isolation unit is contactless, electric arcs cannot be generated when the resistor control module is switched on and switched off, the hidden danger of igniting refrigerants is eliminated, and the safety is higher. In a third aspect, the resistance control module provided by the application has a simple circuit structure, so that the cost is low.
Optionally, the isolation unit includes a light emitting diode and a light receiving driving device, the light emitting diode is electrically connected to the driving unit, and the light receiving driving device is connected in parallel to the thermistor; wherein the content of the first and second substances,
when the driving unit drives the diode to emit light, the light receiving driver is conducted, and the thermistor is short-circuited;
the light emitting diode and the light receiving driving device are arranged at intervals so as to avoid electric arcs generated when the light receiving driving device is switched on or switched off.
Optionally, the driving unit includes a driving power supply and a triode, a base of the triode is electrically connected to the controller, an emitter of the triode is grounded, a collector of the triode is electrically connected to a cathode of the light emitting diode, and an anode of the light emitting diode is electrically connected to the driving power supply.
Optionally, the driving unit further includes a first resistor, and a base of the triode is electrically connected to the controller through the first resistor, so that the base of the triode is limited through the first resistor.
Optionally, the driving unit further includes a second resistor, and a collector of the triode is electrically connected to a cathode of the light emitting diode through the second resistor, so that the collector of the triode is limited through the second resistor.
Optionally, the light receiving driver element comprises a light receiving triode or a triac.
Optionally, when the light receiving driving device is a light receiving triode, the isolation unit is packaged as an optocoupler;
and when the light receiving driving device is a bidirectional triode thyristor, the isolation unit is packaged into a solid-state relay.
Optionally, when the isolation unit is packaged as a solid-state relay, the light emitting diode is electrically connected with the driving unit through a second pin and a fourth pin of the solid-state relay, the bidirectional thyristor is electrically connected with two ends of the thermistor through a sixth pin and an eighth pin of the solid-state relay respectively, and the rest pins of the solid-state relay are empty pins.
In a second aspect, an embodiment of the present application provides a power output circuit, where the power output circuit includes a filtering module, a transforming module, a thermistor, a rectifying module, an electrolytic capacitor, and the above resistor control module, and the filtering module, the transforming module, the thermistor, the rectifying module, and the electrolytic capacitor are sequentially electrically connected.
In a third aspect, an embodiment of the present application provides an air conditioner, where a refrigerant in the air conditioner is an R290 refrigerant, and the air conditioner includes the above power output circuit.
Drawings
Fig. 1 is a circuit diagram of a power output circuit in the prior art.
Fig. 2 is a block diagram of a resistance control module according to an embodiment of the present disclosure.
Fig. 3 is a circuit diagram of a power output circuit according to an embodiment of the present application.
Description of reference numerals:
100-a resistance control module; 110-a controller; 120-a drive unit; 130-an isolation unit; 140-a filtering module; 150-a voltage transformation module; 160-a rectification module; 200-a power supply output circuit; 210-a thermistor; 131-a light emitting diode; 132-a light-receiving driving device; e1-electrolytic capacitor; q1-triode; r1 — first resistance; r2-second resistance.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As described in the background art, in the current air conditioner, an NTC resistor is added to a power output circuit, which has the function of limiting the inrush current during startup, so as to limit the current and prevent the damage to the device caused by the large current at the startup moment.
For example, as shown in fig. 1, NTC1 represents an NTC resistor in the diagram. The input end of the power output circuit is connected with the zero line and the live wire, an external power supply is introduced, and after filtering and voltage transformation, the power supply is transmitted to the rectifier bridge. When the device is started, the electrolytic capacitor E1 is equivalent to a short circuit, if the NTC resistor is not arranged, the current is very large, the devices on the circuit are very easy to damage, and after the NTC resistor is added, the starting current is limited. When the power supply is started, the power supply is stably output, and at the moment, current flows through the NTC resistor, unnecessary power consumption loss is generated, and efficiency is reduced.
In view of this, in order to solve the problem that the NTC resistor consumes power during operation and reduces efficiency, the present application provides a resistor control module, which realizes a small effect of improving efficiency by using the resistor control module to short-circuit the NTC resistor during normal operation of the circuit.
The following is an exemplary description of the resistance control module provided in the present application:
as an alternative implementation manner, the resistance control module is applied to a power output circuit, please refer to fig. 2, the power output circuit 200 includes a thermistor 210 (NTC 1 in fig. 2), the resistance control module 100 includes a controller 110, a driving unit 120 and an isolating unit 130, the controller 110 is electrically connected to the driving unit 120, the driving unit 120 is electrically connected to the isolating unit 130, and the isolating unit 130 is also electrically connected to the thermistor 210. The controller 110 is configured to control the isolation unit 130 to be in an on state or an off state through the driving unit 120, and when the isolation unit 130 is in the on state, the thermistor 210 is short-circuited.
It should be noted that the thermistor 210 described herein is the NTC resistor described above, and can achieve the purpose of resisting surge current. Also, in the present application, the isolation unit 130 is connected in parallel with the thermistor 210, and when the isolation unit 130 is in a conductive state, the thermistor 210 may be short-circuited.
The power output circuit 200 can be applied to an air conditioner, for example, an air conditioner, and with the resistance control module 100 provided in the present application, firstly, when the air conditioner is started, the controller 110 can control the isolation unit 130 to be non-conductive, so that the thermistor 210 normally operates to play a role of current limiting. After the air conditioner is started, the controller 110 may control the isolation unit 130 to be in a conducting state, so that the thermistor 210 is short-circuited, and the thermistor 210 does not generate power consumption, thereby improving efficiency. Secondly, the resistance control module 100 only includes the controller 110, the driving unit 120, the isolation unit 130, and the like, so the circuit structure is simple, the cost is low, and the performance price is excellent. In addition, the isolating unit 130 is electrically connected with the thermistor 210, and the isolating unit 130 is contactless, so that electric arcs cannot be generated when the isolating unit 130 is switched on or switched off, the hidden danger of refrigerant ignition is eliminated, and the safety is higher.
It should be noted that the R290 refrigerant is a novel environment-friendly refrigerant, and is mainly used for central air conditioners, heat pump air conditioners, household air conditioners and other small refrigeration equipment, the R290 refrigerant is also called propane, and has excellent thermal performance and low price, and the R290 has compatibility with common lubricating oil and mechanical structure materials, ODP is 0, GWP is small, synthesis is not required, the content of natural hydrocarbons is not changed, and greenhouse effect is not directly affected. The refrigerating capacity of the propane per unit volume is large, and the propane refrigerating system is very suitable for a small rotary compressor. The main physical property of the propane is very similar to that of R22, an R22 system can be adopted, the original machine and the production line are not modified, and the propane is directly filled, so that the propane belongs to a direct substitute.
Based on the good refrigeration characteristic of R290 and the release of the pouring capacity limitation, R290 is a trend as the refrigerant of the air conditioner, but the R290 refrigerant is a combustible substance, so that the combustible characteristic of the R290 refrigerant needs to be considered synchronously when a low-power-consumption circuit is designed, and the R290 refrigerant is prevented from being combusted when the air conditioner is operated and is turned on or off due to the leakage of the R290. In other words, the main reason why the air conditioner using the R290 refrigerant is limited at present is that the R290 refrigerant is flammable refrigerant, which has certain safety hazard.
The isolation unit 130 is adopted in the resistor control module 100 to realize the connection with the thermistor 210, and the isolation unit 130 is contactless, so that electric arcs cannot be generated when the resistor control module is switched on and switched off, namely electric sparks cannot be generated, the refrigerant ignition condition is avoided, the safety is improved under the condition of reducing the power consumption, and the resistor control module is suitable for an air conditioner using an R290 refrigerant.
As one implementation manner, the isolation unit 130 includes a light emitting diode 131 and a light receiving driver 132, the light emitting diode 131 is electrically connected to the driving unit 120, and the light receiving driver 132 is connected to the thermistor 210 in parallel; when the driving unit 120 drives the diode to emit light, the light receiving driver 132 is turned on, and the thermistor 210 is short-circuited, and the light emitting diode 131 and the light receiving driver 132 are spaced apart from each other to prevent an arc from being generated when the light driving device 132 is turned on or off.
In other words, the isolation described in the present application means that the light emitting diode 131 is not in contact with the light receiving driver 132, so that there is no contact between the light emitting diode and the light receiving driver, thereby avoiding the generation of electric spark when the light emitting diode is turned on or off.
Meanwhile, the light emitting diode 131 is driven by the driving unit 120, and the controller 110 controls the light emitting diode 131 to be turned on or off through the driving unit 120, so as to control whether the light receiving driver 132 is turned on or not, thereby achieving the effect of whether the thermistor 210 is short-circuited or not.
Optionally, the driving unit 120 includes a driving power supply and a transistor Q1, wherein a base of the transistor Q1 is electrically connected to the controller 110, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is electrically connected to a cathode of the light emitting diode 131, and an anode of the light emitting diode 131 is electrically connected to the driving power supply.
The triode Q1 is an NPN triode Q1, and when the controller 110 outputs a high level to the base of the triode Q1, the triode Q1 is turned on, and at this time, the driving power supply, the light emitting diode 131 and the triode Q1 form a loop to be turned on, the light emitting diode 131 is turned on, the light receiving driver 132 is turned on, and the thermistor 210 is short-circuited. When the controller 110 outputs a low level to the base of the transistor Q1, the transistor Q1 is turned off, no current flows through the light emitting diode 131, the light receiving driver 132 is turned off, and the thermistor 210 operates normally.
Also, as an implementation manner, in order to protect the transistor Q1, the driving unit 120 further includes a first resistor R1, and a base of the transistor Q1 is electrically connected to the controller 110 through the first resistor R1, so as to limit a current to the base of the transistor Q1 through the first resistor R1. Meanwhile, the driving unit 120 further includes a second resistor R2, and a collector of the transistor Q1 is electrically connected to the cathode of the light emitting diode 131 through the second resistor R2, so as to limit a current of the collector of the transistor Q1 through the second resistor R2. On this basis, the operation principle of the driving unit 120 is as follows:
the controller 110 sends a high-level driving signal to the transistor Q1 through R2, and the current passes through the light emitting diode 131 from 5V, so that the light emitting diode 131 is turned on, the light receiving driver 132 is turned on, the thermistor 210 is short-circuited, and the current does not flow through the thermistor 210 any more, so that the thermistor 210 does not generate power consumption when the power output circuit 200 operates normally, thereby improving efficiency.
Alternatively, the light receiving driver 132 may be a phototransistor Q1 or a triac.
When the light receiving driving device 132 is the light receiving transistor Q1, the isolation unit 130 is packaged as an optocoupler, and when the light receiving driving device 132 is a triac, the isolation unit 130 is packaged as a solid-state relay. When the isolation unit 130 is packaged as a solid-state relay, the light emitting diode 131 is electrically connected to the driving unit 120 through the second pin and the fourth pin of the solid-state relay, the triac is electrically connected to two ends of the thermistor 210 through the sixth pin and the eighth pin of the solid-state relay, and the remaining pins of the solid-state relay are empty pins.
When connected, the driving power supply is electrically connected with the second pin of the solid-state relay, and the collector of the triode Q1 is electrically connected with the fourth pin of the solid-state relay through the second resistor R2. When the controller 110 outputs a high-level driving signal, the triode Q1 is turned on through the first resistor R1, and the current flows from 5V through the second pin of the solid-state relay, then to the fourth pin, then to the ground through the second resistor R2 and the triode Q1, so that the internal light-emitting diode 131 is turned on, the eighth pin and the sixth pin of the solid-state relay are connected, and the thermistor 210 is short-circuited.
In summary, the resistance control module 100 provided in the present application has a simple and reliable circuit, effectively reduces unnecessary power loss, improves energy efficiency, and does not generate electric arc when the light receiving driver 132 is turned on and off, thereby completely eliminating the hidden danger of refrigerant ignition, and providing a better performance-to-price ratio.
On the basis of the foregoing implementation manner, the present application further provides a power output circuit 200, where the power output circuit 200 includes a filtering module 140, a transforming module 150, a thermistor 210, a rectifying module 160, an electrolytic capacitor E1, and the resistance control module 100, where the filtering module 140, the transforming module 150, the thermistor 210, the rectifying module 160, and the electrolytic capacitor E1 are electrically connected in sequence. When the machine is started, the electrolytic capacitor E1 is equivalent to a short circuit, and the purpose of current limiting is realized through the thermistor 210; when the device is normally operated after being started, the thermistor 210 can be short-circuited by using the resistor control module 100, thereby reducing power consumption.
In addition, an embodiment of the present application further provides an air conditioner, where a refrigerant in the air conditioner is an R290 refrigerant, and the air conditioner includes the power output circuit 200. Although the R290 refrigerant is a flammable refrigerant, since the resistance control module 100 provided by the present application includes the isolation unit 130, an arc may not occur when the resistance control module is turned on or turned off, thereby preventing the refrigerant from being ignited, and improving the safety of the air conditioner in the use process.
In summary, the present application provides a resistance control module, a power output circuit and an air conditioner, the resistance control module is applied to the power output circuit, the power output circuit includes a thermistor, the resistance control module includes a controller, a driving unit and an isolation unit, the controller is electrically connected with the driving unit, the driving unit is electrically connected with the isolation unit, the isolation unit is further electrically connected with the thermistor, wherein the controller is used for controlling the isolation unit to be in a conducting or a turn-off state through the driving unit, and when the isolation unit is in the conducting state, the thermistor is short-circuited. On the first hand, through the arranged resistance control module, when the air conditioner is started, the controller can control the isolation unit to be not conducted, so that the thermistor normally works and the current limiting function is achieved. After the air conditioner is started, the controller can control the isolation unit to be in a conducting state, so that the thermistor is short-circuited, power consumption of the thermistor is not generated, and efficiency is improved. In the second aspect, because the isolation unit is electrically connected with the thermistor in the resistor control module, and because the isolation unit is contactless, electric arcs cannot be generated when the resistor control module is switched on and switched off, the hidden danger of igniting refrigerants is eliminated, and the safety is higher. In a third aspect, the resistance control module provided by the application has a simple circuit structure, so that the cost is low.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A resistance control module, characterized in that the resistance control module (100) is applied to a power output circuit (200), the power output circuit (200) comprises a thermistor (210), the resistance control module (100) comprises a controller (110), a driving unit (120) and an isolation unit (130), the controller (110) is electrically connected with the driving unit (120), the driving unit (120) is electrically connected with the isolation unit (130), the isolation unit (130) is also electrically connected with the thermistor (210), wherein,
the controller (110) is used for controlling the isolation unit (130) to be in a conducting state or a switching-off state through the driving unit (120), and when the isolation unit (130) is in the conducting state, the thermistor (210) is short-circuited.
2. The resistance control module according to claim 1, wherein the isolation unit (130) comprises a light emitting diode (131) and a light receiving driving device (132), the light emitting diode (131) is electrically connected with the driving unit (120), and the light receiving driving device (132) is connected with the thermistor (210) in parallel; wherein the content of the first and second substances,
when the driving unit (120) drives the diode to emit light, the light receiving driving device (132) is conducted, and the thermistor (210) is short-circuited;
the light emitting diode (131) and the light receiving driving device (132) are arranged at intervals so as to avoid electric arcs generated when the light receiving driving device (132) is switched on or switched off.
3. The resistance control module of claim 2, wherein the driving unit (120) comprises a driving power supply and a transistor (Q1), wherein a base of the transistor (Q1) is electrically connected to the controller (110), an emitter of the transistor (Q1) is grounded, a collector of the transistor (Q1) is electrically connected to a cathode of the light emitting diode (131), and an anode of the light emitting diode (131) is electrically connected to the driving power supply.
4. The resistance control module according to claim 3, wherein the driving unit (120) further comprises a first resistor (R1), and the base of the transistor (Q1) is electrically connected to the controller (110) through the first resistor (R1) to current-limit the base of the transistor (Q1) through the first resistor (R1).
5. The resistance control module according to claim 3, wherein the driving unit (120) further comprises a second resistor (R2), and the collector of the transistor (Q1) is electrically connected to the cathode of the light emitting diode (131) through the second resistor (R2) to current-limit the collector of the transistor (Q1) through the second resistor (R2).
6. The resistance control module of claim 2, wherein the light-dependent driving device (132) comprises a light-dependent transistor (Q1) or a triac.
7. The resistance control module (100) according to claim 6, wherein when the light-receiving driving device (132) is a light-receiving transistor (Q1), the isolation unit (130) is packaged as an optical coupler;
when the light receiving driving device (132) is a bidirectional triode thyristor, the isolation unit (130) is packaged into a solid-state relay.
8. The resistance control module according to claim 7, wherein when the isolation unit (130) is packaged as a solid-state relay, the light emitting diode (131) is electrically connected to the driving unit (120) through the second pin and the fourth pin of the solid-state relay, the triac is electrically connected to both ends of the thermistor (210) through the sixth pin and the eighth pin of the solid-state relay, and the remaining pins of the solid-state relay are empty pins.
9. A power output circuit, characterized in that the power output circuit (200) comprises a filtering module (140), a transforming module (150), a thermistor (210), a rectifying module (160), an electrolytic capacitor (E1) and the resistance control module (100) of any one of claims 1 to 8, the filtering module (140), the transforming module (150), the thermistor (210), the rectifying module (160) and the electrolytic capacitor (E1) being electrically connected in sequence.
10. An air conditioner, characterized in that the refrigerant in the air conditioner is R290 refrigerant, the air conditioner comprising the power output circuit (200) according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110373131.4A CN113114022A (en) | 2021-04-07 | 2021-04-07 | Resistance control module, power output circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110373131.4A CN113114022A (en) | 2021-04-07 | 2021-04-07 | Resistance control module, power output circuit and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN113114022A true CN113114022A (en) | 2021-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110373131.4A Pending CN113114022A (en) | 2021-04-07 | 2021-04-07 | Resistance control module, power output circuit and air conditioner |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020191359A1 (en) * | 2001-06-13 | 2002-12-19 | Chin-Hou Chen | Inrush current protection circuit |
| CN201378732Y (en) * | 2009-02-13 | 2010-01-06 | 中山大洋电机股份有限公司 | Inrush current protecting circuit and motor employing same |
| CN104753327A (en) * | 2013-12-30 | 2015-07-01 | 鸿富锦精密工业(武汉)有限公司 | Switching power supply |
| CN206432700U (en) * | 2017-01-24 | 2017-08-22 | 浙江飞越机电有限公司 | The voltage protection circuit of refrigerant recovering brushless DC motor |
-
2021
- 2021-04-07 CN CN202110373131.4A patent/CN113114022A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020191359A1 (en) * | 2001-06-13 | 2002-12-19 | Chin-Hou Chen | Inrush current protection circuit |
| CN201378732Y (en) * | 2009-02-13 | 2010-01-06 | 中山大洋电机股份有限公司 | Inrush current protecting circuit and motor employing same |
| CN104753327A (en) * | 2013-12-30 | 2015-07-01 | 鸿富锦精密工业(武汉)有限公司 | Switching power supply |
| CN206432700U (en) * | 2017-01-24 | 2017-08-22 | 浙江飞越机电有限公司 | The voltage protection circuit of refrigerant recovering brushless DC motor |
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