Fan control circuit and air conditioner

Abstract

The utility model discloses a fan control circuit and an air conditioner, the fan control circuit comprises a voltage conversion circuit, the input end of the voltage conversion circuit is used for accessing an AC power supply, the output end of the voltage conversion circuit is used for accessing a fan, and the voltage conversion circuit is used for switching on and off the AC power supply to convert the AC power supply into a first voltage with an adjustable duty ratio so as to drive the fan to work; the input end of the time adjusting circuit is connected with an alternating current power supply, the control end of the time adjusting circuit is connected with the controlled end of the voltage conversion circuit, and the output end of the time adjusting circuit is connected with a fan; the input end of the induction circuit is used for being connected with an alternating current power supply, the output end of the induction circuit is connected with the controlled end of the time adjusting circuit, and the induction circuit is used for controlling the time adjusting circuit to adjust the duty ratio according to the working temperature of the fan so as to change the air speed of the fan; according to the technical scheme, the situation that normal operation of the air conditioner is affected due to over-temperature shutdown caused by the fact that the draught fan cannot be subjected to work adjustment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a fan control circuit and an air conditioner. Background Art

[0002] Currently, the fan in household air conditioner outdoor units primarily uses a single-phase asynchronous AC motor. These motors lack speed feedback and overcurrent self-shutdown features, relying solely on their own overtemperature protection for operational regulation. This makes it easy for the motor to shut down due to overtemperature protection when the outdoor unit is exposed to high temperatures and high loads, such as when the operating environment is too hot or when the motor's temperature rises due to excessively high operating voltage. This can cause the air conditioner to fail due to system overload protection and prevent normal operation. Utility Model Content

[0003] The main purpose of the utility model is to provide a fan control circuit and an air conditioner, aiming to reduce the situation where the fan cannot be adjusted and causes over-temperature shutdown, thereby affecting the normal operation of the air conditioner.

[0004] To achieve the above-mentioned purpose, the fan control circuit proposed in the present invention includes:

[0005] A voltage conversion circuit, having an input end for connecting to an AC power supply and an output end for connecting to a fan, the voltage conversion circuit being configured to convert the AC power supply into a first voltage with an adjustable duty cycle by switching the AC power supply on and off, thereby driving the fan;

[0006] a time adjustment circuit, whose input end is used to connect to the AC power supply, whose control end is connected to the controlled end of the voltage conversion circuit, and whose output end is used to connect to the fan;

[0007] An induction circuit, whose input end is used to connect to the AC power supply and whose output end is connected to the controlled end of the time adjustment circuit, is used to control the time adjustment circuit to adjust the duty cycle according to the operating temperature of the fan to change the wind speed of the fan.

[0008] In some embodiments, the time adjustment circuit includes:

[0009] an energy storage circuit, the output end of which is connected to the fan, and the control end of which is connected to the controlled end of the voltage conversion circuit;

[0010] A voltage divider circuit, whose input end is used to connect to the AC power supply, and whose output end is connected to the input end of the energy storage circuit. The voltage divider circuit also includes a voltage dividing point, which is connected to the input end of the voltage conversion circuit. The voltage divider circuit is used to control the off time of the voltage conversion circuit together with the energy storage circuit under the control of the induction circuit to adjust the duty cycle of the first voltage.

[0011] In some embodiments, the energy storage circuit includes:

[0012] a first capacitor, a first end of which is connected to the output end of the voltage divider circuit, and a second end of which is electrically connected to the wind turbine;

[0013] a bidirectional diode, the anode of which is connected to the controlled end of the voltage conversion circuit;

[0014] A first resistor is connected in series between the cathode of the bidirectional diode and the first end of the first capacitor.

[0015] In some embodiments, the voltage divider circuit includes:

[0016] a second resistor, a first end of which is the input end of the voltage divider circuit and a second end of which is the voltage divider point;

[0017] A third resistor has a first end connected to the second end of the second resistor, and a second end serving as an output end of the voltage divider circuit.

[0018] In some embodiments, the voltage conversion circuit includes:

[0019] The thyristor has an input end for accessing the AC power supply, a controlled end for connecting to the control end of the time adjustment circuit, and an output end for electrically connecting to the fan.

[0020] In some embodiments, the sensing circuit comprises:

[0021] The thermal protector has an input end for accessing the AC power supply and an output end connected to the controlled end of the time adjustment circuit.

[0022] In some embodiments, the fan control circuit further includes:

[0023] a power supply control circuit, whose input end is used to connect to the AC power supply, whose output end is respectively connected to the input end of the voltage conversion circuit, the input end of the time adjustment circuit, and the input end of the sensing circuit, and whose controlled end is used to connect to an external controller;

[0024] The power supply control circuit is used to connect or stop the AC power supply under the control of the external controller.

[0025] In some embodiments, the power control circuit includes:

[0026] a relay, wherein the power supply end thereof is used to connect to a DC power supply, the input end thereof is used to connect to the AC power supply, and the output end thereof is respectively connected to the input end of the voltage conversion circuit, the input end of the time adjustment circuit, and the input end of the induction circuit;

[0027] A drive circuit, whose input end is electrically connected to the external controller and whose output end is connected to the controlled end of the relay, is used to drive the relay to be turned on or off under the control of the external controller.

[0028] In some embodiments, the driving circuit includes:

[0029] A driver chip comprising an input pin, an output pin, a ground pin, and a power pin, wherein the input pin is used to connect to an external controller, the output pin is connected to the controlled end of the relay, the ground pin is grounded, and the power pin is used to connect to the DC power supply;

[0030] a fourth resistor connected in series between the input pin and ground;

[0031] The second capacitor is connected in parallel to the ground pin and the power pin.

[0032] The utility model also provides an air conditioner, comprising a fan and the above-mentioned fan control circuit, wherein the fan is electrically connected to the fan control circuit.

[0033] The present invention's technical solution uses a sensing circuit to sense the fan's operating temperature, thereby controlling the time adjustment circuit under different operating temperature conditions to adjust the duty cycle of the first voltage output by the voltage conversion circuit, thereby regulating the fan's speed. Because the present invention's technical solution can adjust the fan's speed based on the fan's operating temperature, the fan's operating regulation no longer relies solely on its own over-temperature protection, thereby reducing the risk of the fan being directly shut down due to over-temperature protection when the outdoor unit is under high temperature and high load conditions. This prevents the air conditioner from being unable to operate normally due to system overload protection caused by heat exchange failure in the outdoor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0035] Figure 1This is a structural diagram of an embodiment of a fan control circuit of the present utility model;

[0036] Figure 2 This is a structural diagram of another embodiment of the fan control circuit of the utility model;

[0037] Figure 3 This is a structural diagram of another embodiment of the fan control circuit of the utility model;

[0038] Figure 4 This is a structural diagram of another embodiment of the fan control circuit of the present utility model;

[0039] Figure 5 This is a circuit connection diagram of an embodiment of a fan control circuit of the present utility model;

[0040] Figure 6 This is a circuit connection diagram of another embodiment of the fan control circuit of the present utility model.

[0041] Description of Figure Numbers:

[0042] Label name Label name 100 Voltage conversion circuit U1 driver chip 200 Time adjustment circuit S1 Thermal protector 210 Tank circuit SCR Thyristor 220 Voltage divider circuit DB1 Bidirectional diode 300 Power control circuit C1~C2 First capacitor to second capacitor 310 relay R1~R4 First resistor to fourth resistor 320 Drive circuit

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0046] The utility model provides a fan control circuit.

[0047] Reference Figure 1 In one embodiment, the fan control circuit includes:

[0048] A voltage conversion circuit 100, whose input end is used to connect to an AC power source and whose output end is used to connect to a fan, is used to convert the AC power source into a first voltage with an adjustable duty cycle to drive the fan;

[0049] The time adjustment circuit 200 has an input end for connecting to the AC power supply, a control end for connecting to the controlled end of the voltage conversion circuit 100, and an output end for connecting to the fan;

[0050] The induction circuit has an input end for connecting to the AC power supply and an output end connected to the controlled end of the time adjustment circuit 200. The induction circuit is used to control the time adjustment circuit 200 to adjust the duty cycle to reduce the wind speed of the fan when the operating temperature of the fan reaches the sensing temperature.

[0051] In this embodiment, the time adjustment circuit 200 may be an RC delay circuit, a timer, a timing control circuit, etc., and the sensing circuit may be a thermal sensor, a circuit breaker, etc.

[0052] It should be noted that the sensing circuit corresponds to an induction temperature, and the sensing circuit can control the time adjustment circuit 200 to adjust the duty cycle according to the induction temperature; the voltage conversion circuit 100 adjusts the average voltage connected to the fan by turning the AC power supply on or off. The average voltage is the first voltage in this embodiment, and the time ratio of the voltage conversion circuit 100 being turned on and off is the duty cycle of the first voltage.

[0053] Based on this, when the air conditioner is operating, the fan needs to be powered on, and the sensing circuit senses the fan's operating temperature. The fan's operating temperature is affected by two factors: the ambient temperature of the fan during operation, and the temperature of the fan body caused by the high-voltage operation.

[0054] If the ambient temperature has not reached the sensing temperature and the fan has not heated up due to high-voltage operation, reaching the sensing temperature, the sensing circuit will normally control the time adjustment circuit 200, causing the voltage conversion circuit 100 to repeatedly turn on and off under the control of the time adjustment circuit 200, converting the AC power supply into a first voltage with a corresponding duty cycle. If the ambient temperature reaches the sensing temperature and / or the fan has heated up due to high-voltage operation, reaching the sensing temperature, the sensing temperature will control the time adjustment circuit 200 to adjust the duty cycle of the first voltage output by the voltage conversion circuit 100. Specifically, since the shorter the on time of the voltage conversion circuit 100, the shorter the time the fan is connected to the AC power supply, the lower the average current and / or average voltage output, that is, the lower the first voltage. At this time, the fan, driven by the lower first voltage, will also have a lower speed, thereby reducing its workload and lowering its body temperature rise.

[0055] Furthermore, the sensing circuit also corresponds to a recovery temperature, which is used to adjust the duty cycle of the first voltage when the temperature drops after the time adjustment circuit 200 is controlled according to the sensed temperature. Because the sensing circuit can control the time adjustment circuit 200 according to the ambient temperature, if the ambient temperature of the fan drops below the recovery temperature and the fan also cools below the recovery temperature due to low load operation, the sensing circuit will resume normal control of the time adjustment circuit 200, causing the duty cycle of the first voltage output by the voltage conversion circuit 100 to increase, thereby increasing the speed of the fan.

[0056] The present invention's technical solution, by providing a sensing circuit to sense the fan's operating temperature, can control the time adjustment circuit 200 under different operating temperature conditions, adjusting the duty cycle of the first voltage output by the voltage conversion circuit 100 to adjust the fan's speed. Because the present invention's technical solution can adjust the fan's speed based on the fan's operating temperature, the fan's operating regulation no longer relies solely on its own over-temperature protection, thereby reducing the risk of the fan being directly shut down due to over-temperature protection when the outdoor unit is under high temperature and high load conditions. This prevents the air conditioner from being unable to operate normally due to system overload protection caused by heat exchange failure in the outdoor unit.

[0057] Reference Figure 1 and Figure 2 In one embodiment, the time adjustment circuit 200 includes:

[0058] An energy storage circuit 210, whose output end is connected to the wind turbine, and whose control end is connected to the controlled end of the voltage conversion circuit 100;

[0059] The voltage divider circuit 220 has an input end for connecting to the AC power supply, and an output end connected to the input end of the energy storage circuit 210. The voltage divider circuit 220 also includes a voltage dividing point, which is connected to the input end of the voltage conversion circuit 100. The voltage divider circuit 220 is used to control the off time of the voltage conversion circuit 100 together with the energy storage circuit 210 under the control of the induction circuit to adjust the duty cycle of the first voltage.

[0060] In this embodiment, the energy storage circuit 210 and the voltage divider circuit 220 are combined into an RC delay circuit to control the turn-off time of the voltage conversion circuit 100 .

[0061] Since the delay time of the RC delay circuit is affected by the resistance value and the capacitance value, the present application adopts a method of changing the resistance value to control the delay time. Since in the RC delay circuit, the larger the connected resistance value, the longer the delay time, the present application sets a voltage dividing point in the voltage dividing circuit 220. Under normal temperature conditions, the induction circuit directly connects the voltage dividing point to the AC power supply, so that only part of the resistance value in the voltage dividing circuit 220 is combined with the energy storage capacitor to form an RC delay circuit. At this time, the delay time is shorter, that is, the off time of the voltage conversion circuit 100 is shorter, the duty cycle of the first voltage output by the voltage conversion circuit 100 is larger, and the average voltage connected to the fan is also larger, so that the fan can be controlled to operate normally.

[0062] Under high temperature conditions, the induction circuit disconnects the voltage divider point from the AC power supply, so that the voltage divider circuit 220 is completely combined with the energy storage capacitor to form an RC delay circuit. At this time, the delay time is longer than that under normal temperature conditions, that is, the shutdown time of the voltage conversion circuit 100 is longer, the duty cycle of the first voltage output by the voltage conversion circuit 100 is relatively small, and the average voltage connected to the fan is also small, so the fan can be controlled to slow down.

[0063] Reference Figure 1 、 Figure 2 and Figure 5 In one embodiment, the energy storage circuit 210 includes:

[0064] A first capacitor C1, a first end of which is connected to the output end of the voltage divider circuit 220, and a second end of which is electrically connected to the wind turbine;

[0065] a bidirectional diode DB1, whose anode is connected to the controlled terminal of the voltage conversion circuit 100;

[0066] The first resistor R1 is connected in series between the cathode of the bidirectional diode DB1 and the first end of the first capacitor C1.

[0067] The voltage divider circuit 220 includes:

[0068] a second resistor R2, a first end of which is the input end of the voltage divider circuit 220 and a second end of which is the voltage divider point;

[0069] A first end of the third resistor R3 is connected to the second end of the second resistor R2 , and a second end of the third resistor R3 is the output end of the voltage divider circuit 220 .

[0070] In this embodiment, the first capacitor C1, the second resistor R2, and the third resistor R3 form an RC delay circuit. When controlling the operation of the fan, at the beginning of each half-wave of the AC power supply, the first capacitor C1 begins to charge through the voltage divider circuit 220. When the voltage across the first capacitor C1 reaches the turn-on voltage of the bidirectional diode DB1, the energy storage circuit 210 outputs a trigger signal of a corresponding level to the voltage conversion circuit 100, triggering it to turn on. In other words, the delay time is the time it takes for the voltage across the first capacitor C1 to reach the turn-on voltage of the bidirectional diode DB1.

[0071] Based on this, the sensing circuit bypasses the second resistor R2, or stops bypassing it, to control the resistance value of the first capacitor C1. Specifically, under normal temperature conditions, the sensing circuit bypasses the second resistor R2, so that the first capacitor C1 is connected only to the third resistor R3. In this case, the delay time is short. Under high temperature conditions, the sensing circuit stops bypassing the second resistor R2, so that the first capacitor C1 is connected in series with the third resistor R3 and the second resistor R2. In this case, the delay time is long.

[0072] Reference Figure 1 and Figure 5 In one embodiment, the voltage conversion circuit 100 includes:

[0073] The thyristor SCR has an input end for accessing the AC power supply, a controlled end for connecting to the control end of the time adjustment circuit 200 , and an output end for electrically connecting to the wind turbine.

[0074] In this embodiment, the thyristor (SCR) is a bidirectional thyristor (SCR) that can be turned on under either a forward or reverse trigger signal and has a bidirectional conduction function. Specifically, when the AC power supply is in the positive half-wave, the first capacitor C1 delays the turn-off time of the thyristor (SCR) by storing energy. When the delay of the first capacitor C1 ends, the corresponding positive voltage level is output to the controlled end of the thyristor (SCR) to trigger its forward conduction. At the same time, the first capacitor C1 discharges through the thyristor (SCR). Once the thyristor (SCR) is turned on, even if the trigger signal disappears, the thyristor (SCR) will remain in the on state until the AC power supply enters the negative half-wave, at which point the thyristor (SCR) is turned off and the first capacitor C1 is recharged in the negative half-wave.

[0075] Reference Figure 1 and Figure 5In one embodiment, the sensing circuit includes:

[0076] The thermal protector S1 has an input end for accessing the AC power supply, and an output end connected to the controlled end of the time adjustment circuit 200 .

[0077] In this embodiment, the thermal protector S1 has a corresponding sensing temperature and a recovery temperature, which are inherent properties of the thermal protector S1. When the ambient temperature reaches the sensing temperature, the thermal protector S1 will shut down, connecting the second resistor R2 and the third resistor R3 in series, and connecting to the first capacitor C1. When the ambient temperature does not reach the sensing temperature, or when it drops to the recovery temperature, the thermal protector S1 will close, bypassing the second resistor R2. Specifically, the sensing temperature is determined by the developer based on the critical value of the normal operating temperature of the fan. For example, the sensing temperature can be 120°C, 125°C, etc., and the recovery temperature can be 90°C, 95°C, etc.

[0078] Reference Figure 3 and Figure 6 In one embodiment, the fan control circuit further includes:

[0079] A power control circuit 300, whose input terminal is used to connect to the AC power supply, whose output terminal is respectively connected to the input terminal of the voltage conversion circuit 100, the input terminal of the time adjustment circuit 200, and the input terminal of the sensing circuit, and whose controlled terminal is used to connect to an external controller;

[0080] The power control circuit 300 is used to connect or stop the AC power supply under the control of the external controller.

[0081] In this embodiment, the external controller may be an outdoor controller of the air conditioner, or a control mainboard of the air conditioner.

[0082] After the air conditioner is started, the outdoor unit is powered on, and the external controller synchronously outputs the corresponding connection control signal to the power control circuit 300, driving the power control circuit 300 to connect the AC power supply, so that the voltage conversion circuit 100 can process the AC power supply and supply power to the fan.

[0083] Reference Figure 3 、 Figure 4 and Figure 6 In one embodiment, the power control circuit 300 includes:

[0084] a relay 310, whose power supply terminal is used to connect to a DC power supply, whose input terminal is used to connect to the AC power supply, and whose output terminal is respectively connected to the input terminal of the voltage conversion circuit 100, the input terminal of the time adjustment circuit 200, and the input terminal of the sensing circuit;

[0085] The driving circuit 320 has an input end for electrically connecting to the external controller and an output end connected to the controlled end of the relay 310 . The driving circuit 320 is used to drive the relay 310 to be turned on or off under the control of the external controller.

[0086] In this embodiment, when the drive circuit 320 is connected to the control signal, its output end is controlled to be low level, so that the DC power supply can form a current loop through the relay 310 to the output end of the drive circuit 320, control the relay 310 to be powered on, drive the relay 310 to close, and connect the AC power supply.

[0087] Specifically, the driving circuit 320 includes:

[0088] The driver chip U1 includes an input pin, an output pin, a ground pin, and a power pin. The input pin is used to connect to an external controller, the output pin is connected to the controlled end of the relay 310, the ground pin is grounded, and the power pin is used to connect to the DC power supply.

[0089] A fourth resistor R4 is connected in series between the input pin and ground;

[0090] The second capacitor C2 is connected in parallel to the ground pin and the power pin.

[0091] The present invention also proposes an air conditioner, which includes a fan and a fan control circuit. The fan is electrically connected to the fan control circuit. The specific structure of the fan control circuit refers to the above embodiment. Since this air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0092] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by utilizing the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fan control circuit, characterized in that: include: A voltage conversion circuit, having an input end for connecting to an AC power supply and an output end for connecting to a fan, the voltage conversion circuit being configured to convert the AC power supply into a first voltage with an adjustable duty cycle by switching the AC power supply on and off, thereby driving the fan; a time adjustment circuit, whose input end is used to connect to the AC power supply, whose control end is connected to the controlled end of the voltage conversion circuit, and whose output end is used to connect to the fan; An induction circuit, whose input end is used to connect to the AC power supply and whose output end is connected to the controlled end of the time adjustment circuit, is used to control the time adjustment circuit to adjust the duty cycle according to the operating temperature of the fan to change the wind speed of the fan.

2. The fan control circuit according to claim 1, characterized in that: The time adjustment circuit includes: an energy storage circuit, the output end of which is connected to the fan, and the control end of which is connected to the controlled end of the voltage conversion circuit; A voltage divider circuit, whose input end is used to connect to the AC power supply, and whose output end is connected to the input end of the energy storage circuit. The voltage divider circuit also includes a voltage dividing point, which is connected to the input end of the voltage conversion circuit. The voltage divider circuit is used to control the off time of the voltage conversion circuit together with the energy storage circuit under the control of the induction circuit to adjust the duty cycle of the first voltage.

3. The fan control circuit according to claim 2, characterized in that: The energy storage circuit comprises: a first capacitor, a first end of which is connected to the output end of the voltage divider circuit, and a second end of which is electrically connected to the wind turbine; a bidirectional diode, the anode of which is connected to the controlled end of the voltage conversion circuit; A first resistor is connected in series between the cathode of the bidirectional diode and the first end of the first capacitor.

4. The fan control circuit according to claim 2, characterized in that: The voltage divider circuit comprises: a second resistor, a first end of which is the input end of the voltage divider circuit and a second end of which is the voltage divider point; A third resistor has a first end connected to the second end of the second resistor, and a second end serving as an output end of the voltage divider circuit.

5. The fan control circuit according to claim 1, characterized in that: The voltage conversion circuit includes: The thyristor has an input end for accessing the AC power supply, a controlled end for connecting to the control end of the time adjustment circuit, and an output end for electrically connecting to the fan.

6. The fan control circuit according to claim 1, characterized in that: The sensing circuit comprises: The thermal protector has an input end for accessing the AC power supply and an output end connected to the controlled end of the time adjustment circuit.

7. The fan control circuit according to claim 1, characterized in that: The fan control circuit further includes: a power supply control circuit, whose input end is used to connect to the AC power supply, whose output end is respectively connected to the input end of the voltage conversion circuit, the input end of the time adjustment circuit, and the input end of the sensing circuit, and whose controlled end is used to connect to an external controller; The power supply control circuit is used to connect or stop the AC power supply under the control of the external controller.

8. The fan control circuit according to claim 7, characterized in that: The power control circuit includes: A relay, whose power supply end is used to connect to a DC power supply, whose input end is used to connect to the AC power supply, and whose output end is respectively connected to the input end of the voltage conversion circuit, the input end of the time adjustment circuit, and the input end of the induction circuit; A drive circuit, whose input end is electrically connected to the external controller and whose output end is connected to the controlled end of the relay, is used to drive the relay to be turned on or off under the control of the external controller.

9. The fan control circuit according to claim 8, characterized in that: The driving circuit includes: A driver chip comprising an input pin, an output pin, a ground pin, and a power pin, wherein the input pin is used to connect to an external controller, the output pin is connected to the controlled end of the relay, the ground pin is grounded, and the power pin is used to connect to the DC power supply; a fourth resistor connected in series between the input pin and ground; The second capacitor is connected in parallel to the ground pin and the power pin.

10. An air conditioner, characterized in that: The device comprises a fan and a fan control circuit according to any one of claims 1 to 9, wherein the fan is electrically connected to the fan control circuit.

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