CN108869373B - Fan drive control device - Google Patents
Fan drive control device Download PDFInfo
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- CN108869373B CN108869373B CN201810858539.9A CN201810858539A CN108869373B CN 108869373 B CN108869373 B CN 108869373B CN 201810858539 A CN201810858539 A CN 201810858539A CN 108869373 B CN108869373 B CN 108869373B
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- fan
- power supply
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- switching device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The application relates to fan drive control equipment, which comprises an external drive board and a main control board; the external driving board comprises a power supply circuit and a fan control circuit, the fan control circuit is connected with the main control board, the power supply circuit is connected with the main control board, and the fan control circuit is used for connecting a first fan; the power supply circuit is used for being connected with an external power supply, outputting voltage to the main control board according to the connected external power supply, the main control board utilizes power supplied by the power supply circuit and outputs the power supply voltage to the fan control circuit, and the main control board is used for controlling the power supply circuit to stop being connected with the external power supply when a preset standby triggering condition is detected. When the main control board detects a preset standby triggering condition, the power supply circuit is controlled to stop accessing the external power supply, so that all power supplies of the whole fan driving control equipment can be cut off when the main control board is in a standby state because the power supply circuit is not accessed to the external power supply, thereby reducing power consumption in the standby state and saving electric energy.
Description
Technical Field
The application relates to the technical field of fan control, in particular to fan driving control equipment and method.
Background
Along with the rapid increase of economy, the living standard of people is obviously improved, but the use of various household appliances also causes overlarge electricity consumption, wherein the air conditioner is taken as an indispensable household appliance in the daily life of people and is a main source of electricity burden and energy waste.
In the traditional fan drive control system, power is directly supplied to an internal or external drive plate, and the fan is driven to work through the drive plate, but the drive plate can generate certain loss when the traditional fan drive control system is in a standby state, so that the energy waste can be caused by long-term standby, and the defect of low power consumption exists.
Disclosure of Invention
In view of the above, it is necessary to provide a fan drive control apparatus capable of achieving low power consumption standby in view of the above-described problems.
The fan driving control equipment comprises an external driving board and a main control board; the external driving board comprises a power supply circuit and a fan control circuit, the fan control circuit is connected with the main control board, the power supply circuit is connected with the main control board, and the fan control circuit is used for connecting a first fan;
the power supply circuit is used for being connected with an external power supply, outputting voltage to the main control board according to the connected external power supply, the main control board utilizes power supplied by the power supply circuit and outputs the power supply voltage to the fan control circuit, and the main control board is used for controlling the power supply circuit to stop being connected with the external power supply when a preset standby triggering condition is detected.
In one embodiment, the power supply circuit comprises a first switching device and a power factor correction circuit, wherein the first switching device is connected with the power factor correction circuit, the first switching device is connected with the main control board, and the power factor correction circuit is connected with the main control board.
In one embodiment, the power supply circuit further comprises a rectifying circuit, the rectifying circuit is connected with the first switching device, and the rectifying circuit is connected with the power factor correction circuit.
In one embodiment, the main control board comprises a second switching device and a control circuit, the second switching device is connected with the first switching device, the second switching device is connected with the fan control circuit, and the control circuit is connected with the power factor correction circuit.
In one embodiment, the control circuit comprises a drive control circuit and a switching power supply, the drive control circuit is connected with the switching power supply, the switching power supply is connected with the power factor correction circuit, the input end of the second switching device is connected with the switching power supply, the output end of the second switching device is connected with the control end of the first switching device, the output end of the second switching device is connected with the fan control circuit, and the control end of the second switching device is connected with the drive control circuit.
In one embodiment, the drive control circuit is further configured to connect to a second fan.
In one embodiment, the driving control circuit comprises a control chip, the control chip is connected with the switching power supply, the control chip is connected with the control end of the second switching device, the control chip is connected with the second fan, and the control chip is used for receiving current indoor air quality data and sending a fan control signal to the fan control circuit according to the current indoor air quality data and a preset air quality standard.
In one embodiment, the control chip is further configured to receive a first fan rotation speed feedback signal sent by the fan control circuit, calculate a current rotation speed of the first fan according to the first fan rotation speed feedback signal, and control the rotation speed of the first fan according to the current rotation speed of the first fan.
In one embodiment, the control chip is further configured to receive a second fan rotation speed feedback signal sent by the second fan, calculate a current rotation speed of the second fan according to the second fan rotation speed feedback signal, and control the rotation speed of the second fan according to the current rotation speed of the second fan.
In one embodiment, the external drive board further comprises a semiconductor control device connected to the blower control circuit, the semiconductor control device being connected to the first blower.
The fan driving control equipment comprises an external driving board and a main control board; the external driving board comprises a power supply circuit and a fan control circuit, the fan control circuit is connected with the main control board, the power supply circuit is connected with the main control board, and the fan control circuit is used for connecting a first fan; the power supply circuit is used for being connected with an external power supply, outputting voltage to the main control board according to the connected external power supply, the main control board utilizes power supplied by the power supply circuit and outputs the power supply voltage to the fan control circuit, and the main control board is used for controlling the power supply circuit to stop being connected with the external power supply when a preset standby triggering condition is detected. The power supply circuit is connected with an external power supply, and outputs voltage to the main control board according to the connected external power supply, the main control board utilizes the power supplied by the power supply circuit and outputs the power supply voltage to the fan control circuit, so that a serial topology structure is realized, and when a preset standby triggering condition is detected, the power supply circuit is controlled to stop connecting with the external power supply, so that all power supplies of the whole fan drive control device can be cut off when the power supply circuit is not connected with the external power supply in a standby state, thereby reducing power consumption in the standby state.
Drawings
FIG. 1 is a block diagram of a blower drive control device according to one embodiment;
FIG. 2 is a block diagram of a blower drive control device according to another embodiment;
FIG. 3 is a block diagram of a further embodiment of a blower drive control device;
FIG. 4 is a block diagram of a further embodiment of a fan drive control apparatus;
fig. 5 is a block diagram showing the structure of a motor drive control apparatus according to another embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, there is provided a fan drive control apparatus including an external drive board 100 and a main control board 200; the external driving board 100 comprises a power supply circuit 120 and a fan control circuit 140, wherein the power supply circuit 120 is connected with the main control board 200, the fan control circuit 140 is connected with the main control board 200, and the fan control circuit 140 is used for being connected with the first fan 300.
The power supply circuit 120 is used for accessing an external power supply, outputting a voltage to the main control board 200 according to the accessed external power supply, and the main control board 200 utilizes the power supplied by the power supply circuit 120 and outputs the power supply voltage to the fan control circuit 140. After the power supply circuit 120 is connected to an external power supply, the whole fan driving control device is supplied to work normally according to the connected external power supply, specifically, the power supply circuit 120 outputs voltage to the main control board 200 according to the connected external power supply, the main control board 200 can operate normally by utilizing the power supplied by the power supply circuit 120 and outputs the power supply voltage to the fan control circuit 140, the external power supply is connected to the main control board 200 through the power supply circuit 120 to input, and the main control board 200 outputs the power supply voltage to supply power to the fan control circuit 140, so that a serial topology structure is realized.
When the preset standby trigger condition is detected, the main control board 200 controls the power supply circuit 120 to stop accessing the external power supply, specifically, the preset standby trigger condition includes that a fan control instruction is not received or a standby command input by a user is received within a preset time period, when the preset standby trigger condition is detected, the whole fan driving control device is in a standby state, the power supply circuit 120 is controlled to stop accessing the external power supply, so that no voltage is output to the main control board 200 by the power supply circuit 120, no power supply voltage is output to the fan control circuit 140 by the main control board 200, and the whole fan driving control device stops accessing the external power supply by the power supply circuit 120, thereby effectively reducing power consumption on the external driving board in the standby state and saving electric energy.
The fan control circuit 140 is further configured to control the first fan to operate according to a fan control instruction sent by the main control board 200, and specifically, the fan control circuit 140 may also control the rotation speed, the current, the operation mode, and the like of the motor according to other instructions sent by the main control board 200.
The fan driving control device comprises an external driving board 100 and a main control board 200; the external driving board 100 comprises a power supply circuit 120 and a fan control circuit 140, wherein the fan control circuit 140 is connected with the main control board 200, the power supply circuit 120 is connected with the main control board 200, and the fan control circuit 140 is used for being connected with the first fan 300; the power supply circuit 120 is used for accessing an external power supply, and outputting a voltage to the main control board 200 according to the accessed external power supply, the main control board 200 utilizes the power supplied by the power supply circuit 120 and outputs the power supply voltage to the fan control circuit 140, and the main control board 200 is used for controlling the power supply circuit 120 to stop accessing the external power supply when detecting a preset standby triggering condition. The external power supply is connected through the power supply circuit 120, and voltage is output to the main control board 200 according to the connected external power supply, the main control board 200 utilizes the power supplied by the power supply circuit 120 and outputs the power supply voltage to the fan control circuit 140, so that a serial topology structure is realized, and when a preset standby triggering condition is detected, the power supply circuit 120 is controlled to stop being connected to the external power supply, so that all power supplies of the whole fan driving control device can be cut off when the power supply circuit 120 is not connected to the external power supply in a standby state, thereby reducing power consumption in the standby state, realizing low-power consumption control and saving electric energy.
In one embodiment, as shown in fig. 2, the power supply circuit 120 includes a first switching device 122 and a power factor correction circuit 126, the first switching device 122 is connected to the main control board 200, and the power factor correction circuit 126 is connected to the main control board 200. Specifically, when the first switching device 122 is in the closed state, an external power supply is connected to the power factor correction circuit 126, the power factor correction circuit 126 processes the connected external power supply, the harmonic content in the processed voltage passing through the power factor correction circuit 126 is smaller, and the voltage after eliminating the harmonic is output to the main control board 200, so that the harmonic of the first fan can be effectively reduced, the efficiency and the service life of the first fan are improved, and the electromagnetic compatibility is improved. When the main control board 200 detects a preset standby triggering condition, the first switching device 122 is controlled to be turned off, and at this time, the external power supply is stopped to reduce the power consumption in the standby state.
In one embodiment, as shown in fig. 2, the power supply circuit 120 further includes a rectifying circuit 124, where the rectifying circuit 124 is connected to the first switching device 122, and the rectifying circuit is connected to the power factor correction circuit 126, and when the external power source is ac, the ac that is connected to the first switching device through the rectifying circuit 124 is rectified to obtain dc, and the dc is output to the power factor correction circuit 126.
In one embodiment, as shown in fig. 3, the main control board 200 includes a second switching device 220 and a control circuit 240, the second switching device 220 is connected to the first switching device 122, the second switching device 220 is connected to the fan control circuit 140, and the control circuit 240 is connected to the power factor correction circuit 126. Specifically, when the first switching device 122 is closed, an external power source is connected to the rectifying circuit 124, the rectifying circuit 124 rectifies the connected external power source to obtain a direct current, the direct current is output to the control circuit 240 after harmonic elimination by the power factor correction circuit 126, and the control circuit 240 outputs a power supply voltage to the fan control circuit 140. When the control circuit 240 detects a preset standby triggering condition, the first switching device 122 is controlled to be turned off, so that when in a standby state, all power sources of the whole fan driving control device can be cut off as no external power source is connected, thereby reducing power consumption in the standby state, realizing low-power consumption control and saving electric energy.
In one embodiment, as shown in fig. 4, the control circuit 240 includes a driving control circuit 242 and a switching power supply 244, the driving control circuit 242 is connected to the switching power supply 244, the switching power supply 244 is connected to the pfc circuit 126, an input terminal of the second switching device 220 is connected to the switching power supply 244, an output terminal of the second switching device 220 is connected to a control terminal of the first switching device 122, an output terminal of the second switching device 220 is connected to the fan control circuit 140, and a control terminal of the second switching device 220 is connected to the driving control circuit 242. Specifically, the first switching device 120 and the second switching device 220 are both relays, the input end of the first switching device 120 is connected to an external power supply, the output end of the first switching device 120 is connected to the rectifying circuit 124, the control end of the first switching device 120 is connected to the output end of the second switching device 220, the output end of the second switching device 220 is connected to the fan control circuit 140, the control end of the second switching device 220 is connected to the driving control circuit 242, when the second switching device 220 is closed, the power supply voltage is output to the fan control circuit 140, at this time, the power supply voltage is output to the first switching device 122, the first switching device 122 is controlled to be closed, when the driving control circuit 242 detects a preset standby triggering condition, the second switching device 220 is controlled to be opened, then no power supply voltage is output to the fan control circuit 140, and at this time, the power supply of the whole fan driving control device is cut off, so that the power consumption in a standby state is reduced, low power consumption control is realized, and electric energy is saved.
In one embodiment, as shown in fig. 4, the driving control circuit 242 is further configured to connect to the second fan 400, specifically, the first fan 300 is a fresh air fan, the fresh air fan is configured to discharge air sucked from the outdoor into the room after filtering, etc., the driving control circuit 242 can control the first fan 300 to start up, adjust the rotation speed and the current, etc. by outputting a control signal to the fan control circuit 140, the second fan 400 is an exhaust fan, and is configured to suck air from the outdoor into the room, and the driving control circuit 242 directly controls the second fan 400 by outputting a control signal to the second fan 400.
In one embodiment, as shown in fig. 5, the driving control circuit 242 includes a control chip 241, the control chip 241 is connected to the switching power supply 244, the control chip 241 is connected to the control end of the second switching device 220, the control chip 241 is connected to the second fan 400, and the control chip 241 is configured to receive current indoor air quality data and send a fan control signal to the fan control circuit 140 according to the current indoor air quality data and a preset air quality standard. Specifically, the current indoor air quality data may be collected by a sensor and then sent to the control chip 241, where the current indoor air quality data is used to measure the current indoor air quality, the control chip 241 measures the quality of the current indoor air quality according to the current indoor air quality data and a preset air quality standard, and sends a fan control signal to the fan control circuit 140 according to the current indoor air quality, the fan control circuit 140 correspondingly controls the first fan 300 according to the received fan control signal, and the control chip 241 may also send a fan control signal to the second fan 400 according to the current indoor air quality to control the second fan 400. When the control chip 241 judges that the current indoor air quality meets the normal standard, the indoor air quality is automatically converted into an internal circulation mode, and only the first fan 300 is controlled to work at the moment, wherein the first fan 300 is a new fan and is used for discharging the air sucked from the outdoor into the indoor after the functions of filtering and the like; when the control chip 241 judges that the current indoor air instruction does not meet the normal standard, the operation is automatically converted into a heat exchange mode, and at the moment, the first fan 300 and the second fan 400 are controlled to work simultaneously, the first fan 300 is a new fan and is used for exhausting air sucked outdoors into the room after the functions of filtering and the like, the second fan 400 is an exhaust fan and is used for sucking the air outdoors into the room, and meanwhile, the first fan 300 and the second fan 400 are controlled to work, so that the indoor air can be quickly converted, and the indoor air quality is improved. The first switching device 220 is connected to the first switching device 120 through a power port, so that the driving control circuit 242 can control the on-off of the first switching device 220, and the switching power supply 244 provides a virtual grounding function for the external driving board through a grounding port.
In one embodiment, as shown in fig. 5, the external driving board 100 further includes a semiconductor control device 160, where the semiconductor control device 160 is connected to the blower control circuit 140, and the semiconductor control device 160 is connected to the first blower 300. Specifically, the semiconductor control device 160 is an insulated gate bipolar transistor, is a composite full-control voltage-driven power semiconductor device formed by a bipolar transistor and an insulated gate field effect transistor, and the fan control circuit 140 controls the on-off time of the insulated gate bipolar transistor according to a control signal sent by the control chip 241 to realize variable frequency control of the first fan 300.
In one embodiment, the main control board 200 further includes a semiconductor control device connected to the control chip 241, and the semiconductor control device is connected to the second blower 400. The semiconductor control device is an insulated gate bipolar transistor, and is a composite full-control voltage-driven power semiconductor device composed of a bipolar triode and an insulated gate field effect transistor, so that the control chip 241 can control signals to realize variable frequency control of the second fan 400 by controlling the on-off time of the insulated gate bipolar transistor.
In one embodiment, the control chip 241 is further configured to receive the first fan speed feedback signal sent by the fan control circuit 140, calculate the current speed of the first fan 300 according to the first fan speed feedback signal, and control the speed of the first fan 300 according to the current speed of the first fan 300. Specifically, after the control chip 241 calculates the actual rotation speed of the first fan 300, a first fan adjusting signal may be sent to the fan control circuit 140 according to the actual rotation speed of the first fan 300 and the current air quality, where the first fan adjusting signal is used to adjust the rotation speed and/or current of the first fan 300, the fan control circuit 140 adjusts the rotation speed and/or current of the first fan 300 according to the adjusting signal, specifically, the control chip 241 sends a PWM signal to the fan control circuit 140, and the duty ratio of the PWM signal determines the rotation speed and current of the first fan 300. The first switching device 220 is connected to the first switching device 120 through the VSP port, so that the control chip 241 may transmit a PWM signal to the fan control circuit 140, and the fan control circuit 140 may further feed back a first fan rotation speed feedback signal to the control chip 241 through the FG port, so that the control chip 241 may calculate the current rotation speed of the first fan 300 according to the first fan rotation speed feedback signal
In one embodiment, the control chip 241 is further configured to receive a second fan rotation speed feedback signal sent by the second fan 400, calculate a current rotation speed of the second fan 400 according to the second fan rotation speed feedback signal, and control the rotation speed of the second fan 400 according to the current rotation speed of the second fan 400. Specifically, after the control chip 241 calculates the actual rotation speed of the second fan 400, a first fan adjusting signal may be sent to the second fan 400 according to the actual rotation speed of the second fan 400 and the current air quality, where the first fan adjusting signal is used to adjust the rotation speed and/or current of the second fan 400, specifically, the control chip 241 sends a PWM signal to the second fan 400, and the duty ratio of the PWM signal determines the rotation speed and current of the second fan 400.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The fan driving control equipment is characterized by comprising an external driving board and a main control board; the external driving board comprises a power supply circuit and a fan control circuit, the fan control circuit is connected with the main control board, the power supply circuit is connected with the main control board, and the fan control circuit is used for being connected with a first fan;
the power supply circuit is used for accessing an external power supply, outputting voltage to the main control board according to the accessed external power supply, and the main control board utilizes the power supplied by the power supply circuit and outputs the power supply voltage to the fan control circuit;
the main control board comprises a second switching device and a control circuit, the second switching device is connected with a first switching device of the power supply circuit,
the control circuit comprises a drive control circuit and a switching power supply, wherein the drive control circuit is connected with the switching power supply, the switching power supply is connected with a power factor correction circuit of the power supply circuit, the input end of a second switching device is connected with the switching power supply, the output end of the second switching device is connected with the control end of a first switching device, the output end of the second switching device is connected with the fan control circuit, and the control end of the second switching device is connected with the drive control circuit;
when the drive control circuit detects a preset standby trigger condition, the second switching device is controlled to be disconnected, so that the first switching device is disconnected due to no power supply voltage input, and the external power supply of the fan drive control device is cut off.
2. The fan drive control apparatus according to claim 1, wherein the first switching device is connected to the power factor correction circuit.
3. The fan drive control apparatus according to claim 2, wherein the power supply circuit further includes a rectifying circuit, the rectifying circuit being connected to the first switching device, the rectifying circuit being connected to the power factor correction circuit.
4. A fan drive control apparatus as claimed in claim 3, wherein the drive control circuit is further adapted to connect to a second fan.
5. The fan drive control apparatus of claim 4, wherein the drive control circuit includes a control chip connected to the switching power supply, the control chip connected to a control terminal of the second switching device, the control chip connected to the second fan, the control chip configured to receive current indoor air quality data, and send a fan control signal to the fan control circuit according to the current indoor air quality data and a preset air quality standard.
6. The fan drive control apparatus of claim 5, wherein the control chip is further configured to receive a first fan speed feedback signal sent by the fan control circuit, calculate a current speed of the first fan according to the first fan speed feedback signal, and control the speed of the first fan according to the current speed of the first fan.
7. The fan drive control apparatus according to claim 5, wherein the control chip is further configured to receive a second fan rotation speed feedback signal sent by the second fan, calculate a current rotation speed of the second fan according to the second fan rotation speed feedback signal, and control the rotation speed of the second fan according to the current rotation speed of the second fan.
8. The blower drive control device of claim 1, wherein the external drive board further comprises a semiconductor control device connected to the blower control circuit, the semiconductor control device connected to the first blower.
9. The fan driving control apparatus according to claim 4, wherein the first fan is a fresh air fan for filtering air sucked outdoors and discharging the filtered air into the room, and the second fan is an exhaust fan for sucking air outdoors into the room.
10. The fan drive control apparatus according to claim 5, wherein the main control board further includes a semiconductor control device connected to a control chip, the semiconductor control device being connected to the second fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810858539.9A CN108869373B (en) | 2018-07-31 | 2018-07-31 | Fan drive control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810858539.9A CN108869373B (en) | 2018-07-31 | 2018-07-31 | Fan drive control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108869373A CN108869373A (en) | 2018-11-23 |
| CN108869373B true CN108869373B (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810858539.9A Active CN108869373B (en) | 2018-07-31 | 2018-07-31 | Fan drive control device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173801A (en) * | 2019-05-10 | 2019-08-27 | 广东美的制冷设备有限公司 | Air conditioner and its control method and device |
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| WO2015161840A1 (en) * | 2014-04-22 | 2015-10-29 | Wisy Ag Haustechniksysteme, Filtertechnik | Device for switching a main current circuit |
| CN206461539U (en) * | 2017-01-19 | 2017-09-01 | 广州速航节能科技有限公司 | Small power DC brushless fan drive circuit with PFC |
| CN207599948U (en) * | 2017-12-06 | 2018-07-10 | 珠海亚丁科技有限公司 | Low-tension supply power supply circuit and frequency-conversion air-conditioning system |
| CN208634087U (en) * | 2018-07-31 | 2019-03-22 | 珠海格力电器股份有限公司 | Blower drive control apparatus |
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2018
- 2018-07-31 CN CN201810858539.9A patent/CN108869373B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015161840A1 (en) * | 2014-04-22 | 2015-10-29 | Wisy Ag Haustechniksysteme, Filtertechnik | Device for switching a main current circuit |
| CN206461539U (en) * | 2017-01-19 | 2017-09-01 | 广州速航节能科技有限公司 | Small power DC brushless fan drive circuit with PFC |
| CN207599948U (en) * | 2017-12-06 | 2018-07-10 | 珠海亚丁科技有限公司 | Low-tension supply power supply circuit and frequency-conversion air-conditioning system |
| CN208634087U (en) * | 2018-07-31 | 2019-03-22 | 珠海格力电器股份有限公司 | Blower drive control apparatus |
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| CN108869373A (en) | 2018-11-23 |
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