Air conditioner

Abstract

The utility model discloses an air conditioner. Comprising an alternating current input port used for outputting alternating current, an outdoor fan connected with the alternating current input port, a standby circuit connected with an outdoor control circuit and an indoor control circuit, a first switch arranged between the alternating current input port and the outdoor fan, and a low-power-consumption standby circuit. The air conditioner comprises a first switch, a fan detection circuit and a power conversion circuit used for converting back electromotive force generated by rotation of an outdoor fan into direct current, when the air conditioner is in a standby state, the first switch is kept closed, and when the fan detection circuit detects that the outdoor fan rotates, the power conversion circuit is switched on. The power conversion circuit is used for converting back electromotive force generated by rotation of the outdoor fan into stable direct current so as to supply power to the low-power-consumption standby circuit; electric energy generated by rotation of the outdoor fan under the action of natural wind is converted by the power conversion circuit and then supplied to the low-power-consumption standby circuit so as to be used for standby of the air conditioner, and 0W standby is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner. Background Art

[0002] The one-to-many mode of central air conditioning requires the indoor and outdoor units to be in standby mode to respond to the user's power-on demand in real time, which will lead to high standby electricity costs and reduce the user experience. The standby power consumption of the outdoor unit 14 is much higher than that of the indoor unit. It is very important to reduce the standby power consumption of the outdoor unit 14.

[0003] The low-power standby circuit control mentioned in the related technical patent CN114738932A is realized through the low-power standby circuit power supply unit and the backup power circuit. When the standby mode is not required, the backup power circuit is charged, and when the standby mode is in standby mode, the backup power circuit is discharged to supply power to the main control unit. Since the storage capacity of the backup power circuit is limited, it needs to be continuously charged and discharged. Energy loss will also be caused in the process of charging and discharging.

[0004] In view of this, this application is filed. Summary of the invention

[0005] The air conditioner in the present application is provided with a low-power standby circuit and a power conversion circuit, and utilizes the electric energy generated by the rotation of the outdoor fan under the action of natural wind, which is converted by the power conversion circuit and supplied to the low-power standby circuit for use in the air conditioner standby mode, thereby achieving 0W standby mode.

[0006] The present application embodiment provides an air conditioner, which includes:

[0007] AC input port, used to output AC power;

[0008] An outdoor fan, which is used to be electrically connected to the AC input port;

[0009] A standby circuit, which is used to connect at least an outdoor control circuit and an indoor control circuit;

[0010] A first switch is provided between the AC input port and the outdoor fan, and is used to receive an electrical signal sent by the controller to control the AC input port to transmit a power signal to the outdoor fan;

[0011] A fan detection circuit, a first end of which is used to be electrically connected to the outdoor fan to detect the rotation speed of the outdoor fan and send a detection signal to the controller;

[0012] A power conversion circuit, a first end of which is electrically connected to the second end of the fan detection circuit, and a second end of which is electrically connected to the first switch;

[0013] A low-power standby circuit, wherein the output end of the low-power standby circuit is connected to the standby circuit to output a power signal to the standby circuit; a first input end of the low-power standby circuit is connected to the AC input port to receive AC power, and a second input end of the low-power standby circuit is connected to the second end of the power conversion circuit to receive DC power from the power conversion circuit;

[0014] The power conversion circuit is configured such that, in a first state, the power conversion circuit converts direct current into alternating current and outputs it to the outdoor fan, and in a second state, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into stable direct current and sends it to the low-power standby circuit;

[0015] The controller is configured to: when the air conditioner is in a standby state, keep the first switch closed, and when the fan detection circuit detects that the outdoor fan is not rotating, open the first switch and use the AC power output from the AC input port to power the low-power standby circuit;

[0016] When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into stable direct current to supply power to the low-power standby circuit.

[0017] In some embodiments, the air conditioner further comprises:

[0018] AC load;

[0019] A second switch, a first end of which is connected to the AC input port, and a second end of which is connected to the AC load;

[0020] The AC input port is used to send a power signal to the AC load after the second switch is closed, and is used to stop sending the power signal to the AC load when the second switch is opened;

[0021] The controller is configured to, when the air conditioner is in a standby state, turn off the second switch to stop supplying power to the AC load.

[0022] In some embodiments, the controller is configured to close the first switch at a certain period while opening the first switch when the fan detection circuit detects that the outdoor fan is not rotating, and obtain a detection signal from the fan detection circuit to determine the state of the outdoor fan.

[0023] In some embodiments, the low power standby circuit includes:

[0024] A switching power supply module, whose input terminal is respectively connected to the first input terminal and the second input terminal, and whose output terminal is connected to the standby circuit to output a power supply voltage;

[0025] The switch power supply module can selectively transmit the power supply signal of the first input terminal or the second input terminal to the standby circuit.

[0026] Specifically, the switching power supply module is used to transmit the power signal from the first input terminal to the standby circuit when the voltage at the first input terminal is greater than the voltage at the second input terminal;

[0027] When the voltage at the second input terminal is greater than the voltage at the first input terminal, the power signal from the second input terminal is transmitted to the standby circuit.

[0028] In some embodiments, the switching power supply module includes:

[0029] A first sub-diode, with an anode connected to the live wire of the AC input port and a cathode connected to the second end of the power conversion circuit;

[0030] A second sub-diode, a cathode of which is connected to the cathode of the first sub-diode and the second end of the power conversion circuit, and an anode of which is connected to the neutral line of the AC input port;

[0031] A third sub-diode, whose cathode is connected to the anode of the second sub-diode and the neutral line of the AC input port, and whose anode is connected to the second end of the power conversion circuit;

[0032] The fourth sub-diode has a cathode connected to the anode of the first sub-diode and the live wire of the AC input port, and an anode connected to the third sub-diode and the second end of the power conversion circuit.

[0033] In some embodiments, the power conversion circuit includes:

[0034] A first transistor, whose base is connected to the first pulse signal, and a first diode is connected in series between the collector and the emitter; the emitter of the first transistor is electrically connected to the outdoor fan;

[0035] A second triode, whose base is connected to the second pulse signal, a second diode is connected in series between its collector and emitter, the collector of the second triode is electrically connected to the collector of the first triode, and the emitter of the second triode is electrically connected to the outdoor fan;

[0036] a third triode, whose base is connected to the third pulse signal, a third diode is connected in series between its collector and emitter, the collector of the third triode is electrically connected to the collector of the second triode, and the emitter of the third triode is electrically connected to the outdoor fan;

[0037] a fourth triode, whose base is connected to the fourth pulse signal, a fourth diode is connected in series between the collector and the emitter, the collector of the fourth triode is electrically connected to the emitter of the first triode, and the collector of the fourth triode is electrically connected to the outdoor fan;

[0038] a fifth triode, whose base is connected to the fifth pulse signal, whose collector and emitter are connected in series with a fifth diode, whose collector is electrically connected to the emitter of the second triode, and whose collector is electrically connected to the outdoor fan;

[0039] a sixth triode, whose base is connected to the sixth pulse signal, a sixth diode is connected in series between the collector and the emitter, the collector of the sixth triode is electrically connected to the emitter of the third triode, and the collector of the sixth triode is electrically connected to the outdoor fan;

[0040] When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit acts as a three-phase six-switch PFC circuit to convert the back electromotive force generated by the rotation of the outdoor fan into direct current.

[0041] In some embodiments, the second input terminal is electrically connected to the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode to receive the power signal converted into direct current by the power conversion circuit.

[0042] In some embodiments, the air conditioner further comprises:

[0043] The rectifier circuit has an input end electrically connected to the second end of the second switch and is used to convert the input alternating current into direct current.

[0044] The PFC circuit has an input end electrically connected to the output end of the rectifier circuit, and an output end of the PFC circuit electrically connected to the second end of the power conversion circuit.

[0045] In some embodiments, when the outdoor unit receives a power-on command, the first switch is closed, the second switch is closed, and the outdoor unit exits the standby state.

[0046] The air conditioner disclosed in the present application includes an AC input port for outputting AC power, an outdoor fan connected to the AC input port, a standby circuit connected to an outdoor control circuit and an indoor control circuit, a first switch arranged between the AC input port and the outdoor fan, a low-power standby circuit, a fan detection circuit, and a power conversion circuit for converting a back electromotive force generated by the rotation of the outdoor fan into DC power, wherein a first end of the power conversion circuit is electrically connected to a second end of the fan detection circuit, a second end of the power conversion circuit is electrically connected to a second end of the first switch, a first input end of the low-power standby circuit is connected to the AC input port, a second input end of the low-power standby circuit is connected to a second end of the power conversion circuit, and an output end of the low-power standby circuit is connected to the standby circuit to output a power signal to the standby circuit;

[0047] When the air conditioner is in standby mode, the first switch is kept closed, and when the fan detection circuit detects that the outdoor fan is not rotating, the first switch is disconnected, and the AC power output from the AC input port is used to power the low-power standby circuit;

[0048] When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into a stable direct current to supply power to the low-power standby circuit;

[0049] By selectively using the AC power of the AC input port and the electromotive force generated by the rotation of the outdoor fan, the low-power standby circuit is powered to reduce the power consumption in the standby state. At the same time, the normal operation of the standby circuit is met in the standby state, and the communication circuit between the indoor unit and the outdoor unit is guaranteed to start up in time in the standby state.

[0050] The present application also proposes another air conditioner, which comprises:

[0051] AC input port, used to output AC power;

[0052] An outdoor fan, which is used to be electrically connected to the AC input port;

[0053] AC load;

[0054] A second switch, a first end of which is connected to the AC input port, and a second end of which is connected to the AC load;

[0055] A standby circuit, which is used to connect at least an outdoor control circuit and an indoor control circuit;

[0056] A first switch is provided between the AC input port and the outdoor fan, and is used to receive an electrical signal sent by the controller to control the AC input port to transmit a power signal to the outdoor fan;

[0057] A fan detection circuit, a first end of which is used to be electrically connected to the outdoor fan to detect the rotation speed of the outdoor fan and send a detection signal to the controller;

[0058] A power conversion circuit, a first end of which is electrically connected to the second end of the fan detection circuit, and a second end of which is electrically connected to the first switch;

[0059] A low-power standby circuit, wherein the output end of the low-power standby circuit is connected to the standby circuit to output a power signal to the standby circuit; a first input end of the low-power standby circuit is connected to the AC input port to receive AC power, and a second input end of the low-power standby circuit is connected to the second end of the power conversion circuit to receive DC power from the power conversion circuit;

[0060] The controller is configured to: when the air conditioner is in a standby state, close the second switch to stop supplying power to the AC load, and keep the first switch closed;

[0061] When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into stable direct current to supply power to the low-power standby circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0063] Figure 1 shows a hardware configuration diagram of an air conditioner according to some embodiments;

[0064] Figure 2 shows a hardware configuration diagram of an air conditioning system of an air conditioner according to some embodiments;

[0065] Figure 3 shows another hardware configuration diagram of an air conditioner according to some embodiments;

[0066] Figure 4 shows another hardware configuration diagram of an air conditioner according to some embodiments;

[0067] Figure 5 shows another hardware configuration diagram of an air conditioner according to some embodiments;

[0068] Figure 6 is a hardware configuration diagram of a low power standby circuit in one embodiment of the present invention;

[0069] Figure 7 is a circuit diagram of a low power standby circuit in one embodiment of the present invention;

[0070] Figure 8 is a hardware configuration diagram of a controller in one embodiment of the present invention;

[0071] Fig. 9 is a schematic diagram of the power generation principle of an outdoor fan in one embodiment of the present invention;

[0072] Fig.10 is the control logic in the standby state in one embodiment of the present invention;

[0073] Fig.11 is another control logic in the standby state in one embodiment of the present invention;

[0074] Fig.12 is another control logic in the standby state in one embodiment of the present invention;

[0075] In the above picture:

[0076] Controller 21; bus 211; memory 212; processor 213; communication interface 214;

[0077] Outdoor unit 14; indoor unit 16; outdoor fan 19; outdoor fan 141; outdoor motor 142;

[0078] Compressor 3; indoor heat exchanger 4; standby circuit 20; switching power supply 22;

[0079] Outdoor heat exchanger 5; expansion valve 6; four-way valve 15; low power standby circuit 7; first input terminal 71;

[0080] A second input terminal 72; a first output terminal 73; a switching power supply module 74; a first sub-diode 741;

[0081] A second sub-diode 742; a third sub-diode 743; a fourth sub-diode 744; a first switch 8;

[0082] A second switch 9; a rectifier circuit 10; a filter circuit 11; a PFC circuit 12; a power conversion circuit 13;

[0083] Fan detection circuit 14; first diode D1; second diode D2; third diode D3;

[0084] A fourth diode D4; a fifth diode D5; a sixth diode D6; a first transistor 131;

[0085] A second triode 132; a third triode 133; a fourth triode 134; a fifth triode 135;

[0086] The sixth transistor 136 ; the AC input port 17 ; and the AC load 18 . DETAILED DESCRIPTION

[0087] 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. Obviously, the described embodiments 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 work are within the scope of protection of the present invention.

[0088] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0089] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] This application proposes an air conditioner, referring to Figure 1 The air conditioner includes an indoor unit, and the indoor unit includes at least one indoor unit 16.

[0091] The indoor unit group includes a plurality of indoor units 16. The plurality of indoor units 16 are connected in parallel.

[0092] The air conditioner includes an outdoor unit.

[0093] The outdoor unit includes at least one outdoor unit 14 .

[0094] The outdoor unit includes a plurality of outdoor units 14. The outdoor units 14 are connected in parallel.

[0095] The outdoor unit 14 is installed outdoors. The indoor unit 16 and the outdoor unit 14 are connected by a pipeline for the flow of refrigerant.

[0096] The indoor unit 16 includes an indoor casing, which is used to form an outer contour of the indoor unit 16 and to accommodate internal components of the indoor unit 16.

[0097] The indoor shell is provided with an indoor air inlet, which is used for indoor wind to enter the indoor shell.

[0098] The indoor shell is provided with an indoor air outlet. The indoor air outlet is used to discharge the air in the indoor shell. The indoor air enters the indoor shell through the indoor air inlet and then blows out from the indoor air outlet.

[0099] The indoor unit 16 includes an indoor heat exchanger 4. The indoor heat exchanger 4 is installed in an indoor housing. The indoor heat exchanger 4 is used to exchange heat with indoor air entering the indoor housing.

[0100] The indoor unit 16 includes an indoor fan. The indoor fan is installed in an indoor housing. The indoor fan rotates to allow indoor air to enter the indoor housing, and the indoor air exchanges heat with the indoor heat exchanger 4 and then flows out of the indoor housing.

[0101] In the present application, the indoor unit 16 includes but is not limited to a wall-mounted air conditioner, a cabinet air conditioner, and a duct air conditioner.

[0102] The outdoor unit 14 includes an outdoor housing, which is used to form an outer contour of the outdoor unit 14 and to accommodate internal components of the outdoor unit 14.

[0103] The outdoor shell is provided with an outdoor air inlet, and the outdoor air inlet is used for allowing outdoor wind to enter the outdoor shell.

[0104] The outdoor shell is provided with an outdoor air outlet, and the outdoor air outlet is used for exhausting the wind of the outdoor shell. The outdoor wind enters the outdoor shell through the outdoor air inlet and is then blown out from the outdoor air outlet.

[0105] The outdoor unit 14 includes an outdoor heat exchanger 5 , which is installed in an outdoor housing. The outdoor heat exchanger 5 is used to exchange heat with outdoor wind entering the outdoor housing.

[0106] The outdoor unit 14 includes an outdoor fan 19 , which is installed in an outdoor housing. The outdoor fan 19 rotates to allow outdoor wind to enter the outdoor housing, and the outdoor wind exchanges heat with the outdoor heat exchanger 5 and flows out of the outdoor housing.

[0107] The outdoor fan 19 includes an outdoor motor 142. The outdoor motor 142 is used to receive AC power and rotate.

[0108] The outdoor fan 19 includes an outdoor fan 141. The outdoor fan 141 is driven by the outdoor fan 19 to rotate so that outdoor wind enters the outdoor housing through the outdoor air inlet and flows out through the outdoor air outlet.

[0109] Reference Figure 2 , describing the system configuration of the air conditioning system in this application.

[0110] The outdoor unit 14 includes a compressor 3. The compressor 3 can compress a high-temperature and high-pressure gaseous refrigerant and discharge the compressed gaseous refrigerant.

[0111] The compressor 3 includes an air intake port. The refrigerant flows into the compressor 3 from the air intake port to be compressed.

[0112] The compressor 3 includes an exhaust port. The refrigerant enters the compressor 3 from the air intake port, and is compressed by the compressor 3 and then discharged from the exhaust port.

[0113] The outdoor unit 14 further includes a gas-liquid separator. The gas-liquid separator is installed at the air intake of the compressor 3. The gas-liquid separator is used for gas-liquid separation.

[0114] The outdoor unit 14 further includes a four-way valve 15. A first port of the four-way valve 15 is connected to an exhaust port of the compressor 3. A second port of the four-way valve 15 is connected to an intake port of the compressor 3. A third port of the four-way valve 15 is connected to the indoor heat exchanger 4. A fourth port of the four-way valve 15 is connected to the outdoor heat exchanger 5.

[0115] The indoor heat exchanger 4 and the outdoor heat exchanger 5 function as a condenser or an evaporator. When the indoor heat exchanger 4 functions as a condenser, the air conditioner functions as a heater in a heating mode. When the indoor heat exchanger 4 functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0116] The air conditioner uses the flow of refrigerant to blow out conditioned air that is higher than the indoor temperature, lower than the indoor temperature, or the same as the indoor temperature to adjust the temperature and humidity of the indoor environment; or uses the speed of the indoor fan to adjust the air flow rate of the indoor environment.

[0117] When the air conditioner is in cooling operation, the refrigerant from the compressor 3 is condensed through the outdoor heat exchanger 5. The condensed refrigerant flows through the expansion valve 6 to expand. The expanded condensate evaporates through the indoor heat exchanger 4. The evaporated refrigerant then circulates back to the compressor 3.

[0118] When the air conditioner is in heating operation, the refrigerant from the compressor 3 flows through the indoor heat exchanger 4 to be condensed, and the condensed refrigerant expands by flowing through the expansion valve 6. The expanded condensate evaporates through the outdoor heat exchanger 5. The evaporated refrigerant then circulates back to the compressor 3.

[0119] In some embodiments, the air conditioner includes a remote controller, through which a user inputs instructions to the controller to select the operating modes of the indoor unit 16 and the outdoor unit 14 .

[0120] The controller includes an indoor control circuit for controlling the operation of each component of the indoor unit 16, receiving the operation status of each component in the indoor unit 16 and sending control instructions.

[0121] The controller includes an outdoor control circuit for controlling the operation of each component of the outdoor unit 14, receiving the operation status of each component in the outdoor unit 14 and sending control instructions.

[0122] Wired communication is adopted between the indoor control circuit and the outdoor control circuit. In other embodiments, the above communication mode may also be wireless communication.

[0123] In some embodiments, the air conditioner further includes a standby circuit 20, and the standby circuit 20 is at least used to connect the outdoor control circuit and the indoor control circuit.

[0124] The standby circuit 20 may also be referred to as a minimum loop of the controller. The standby circuit is a circuit that needs to keep the air conditioner able to respond in time in the standby state.

[0125] The standby circuit 20 can be used to power the controller 21 and the indoor unit communication circuit to maintain communication with the indoor unit in the standby state. When the indoor unit has a power-on command, it exits the standby state and the air conditioner operates normally.

[0126] The controller 21 is used to coordinate the operation of the entire air conditioner, including receiving user instructions, operating in cooling mode, heating mode, blowing mode, standby mode, etc., and uploading the working status of the air conditioner to the cloud.

[0127] The controller 21 includes a memory 212. The memory 212 may include a high-speed random access memory 212 (RAM) or a non-volatile memory 212 (NVM).

[0128] For example, at least one disk storage 212. The storage 212 is used to store programs.

[0129] Reference Figure 8 , the controller 21 includes a communication interface 214. The communication interface 214 is used to implement communication with related components.

[0130] The communication interface 214 of the controller 21 is used to communicate with the first switch 8 and the second switch 9 .

[0131] The controller 21 includes a processor 213. The processor 213 is used to execute executable modules stored in the memory 212, such as computer programs. The code of the computer program can be in source code form, object code form, executable file or some form thereof.

[0132] The controller 21 includes a bus 211. The bus 211 is used to connect the communication interface 214 and the processor 213. The bus 211 can be an ISA bus 211, a PCI bus 211, or an EISA bus 211.

[0133] The outdoor controller 21 of the outdoor unit 14 and the controller 21 of each indoor unit 16 each include at least one software function module that can be stored in the memory 212 in the form of software or firmware.

[0134] In the present application, after receiving the standby execution instruction, the processor 213 executes the program to implement Fig.10 , 11 The control method shown in .

[0135] In some embodiments, the air conditioner further comprises an AC input port 17. The AC input port 17 is used to connect to the mains to receive 220V AC power from the mains. After conversion inside the air conditioner, the AC power meets the working requirements of various components inside the air conditioner.

[0136] In some embodiments, the AC input port 17 includes L (live wire) and N (neutral wire), which correspond to the live wire and neutral wire of the mains, respectively.

[0137] In some embodiments, the air conditioner includes an AC load 18 .

[0138] In some embodiments, the AC load 18 includes the compressor 3 described above.

[0139] In some embodiments, the AC load 18 further includes a coil, for example, a transformer.

[0140] In some embodiments, the AC load 18 further includes a switching power supply 22. The switching power supply 22 is a power supply device for converting AC power into stable DC power. It receives power from the power grid through the AC input port 17, processes the voltage and current through internal transformers, rectifiers, filters, voltage stabilizers and other circuit components, and outputs stable DC power for the load.

[0141] In some embodiments, AC load 18 includes a motor.

[0142] In the working state, each component of the air conditioning system works according to the received user instructions and the action rules set for the corresponding instructions. In the standby state, each component of the air conditioning system does not work and waits to work after receiving the user instructions.

[0143] However, in the standby state, the AC load 18 of the air conditioner still consumes electric energy. Aiming at the power consumption problem of the air conditioner in the standby state, the present application proposes an air conditioner.

[0144] In some embodiments, reference Figure 3 The air conditioner includes a second switch 9 . A first end of the second switch 9 is connected to an AC input port 17 , and a second end of the second switch 9 is connected to an AC load 18 .

[0145] In some embodiments, the AC input port 17 is used to send a power signal to the AC load 18 after the second switch 9 is closed. That is, the AC input port 17 is used to supply power to the AC load 18 to provide the electrical energy required for the AC load 18 to work.

[0146] In some embodiments, the AC input port 17 is used to stop sending a power signal to the AC load 18 after the second switch 9 is turned off. That is, the AC load 18 is stopped from being supplied with power.

[0147] In the standby state, the second switch 9 is turned off so that the AC input port 17 does not supply power to the AC load 18, thereby reducing energy loss in the standby state.

[0148] In some embodiments, reference Figure 3 The air conditioner also includes a low power consumption standby circuit 7.

[0149] The first input terminal of the low power standby circuit 7 is connected to the AC input port 17. The second input terminal of the low power standby circuit 7 is connected to the standby circuit 20 to output a power signal to the standby circuit 20. The output terminal of the low power standby circuit 7 is connected to the standby circuit to output a power signal to the standby circuit.

[0150] In the standby state, when the power supply of the AC load 18 is turned off, the low-power standby circuit 7 continues to supply power to the standby circuit 20, so that the standby state can be restored to a normal working state in time.

[0151] In some embodiments, the idea of ​​the low-power standby mode is to cut off all useless loads during standby mode, and only retain the communication function and the chip function. These two parts are low-voltage controlled, and the standby power consumption is very low. Therefore, a low-power standby circuit 7 is selected, and after disconnecting other useless loads, the low-power standby circuit 7 is used to power the standby circuit 20, so that the power can be as low as 0.1W when not working.

[0152] Based on the related technology, this embodiment adds a low-power standby circuit 7 and related control to achieve a standby power of less than 1W, thereby achieving low power consumption in standby mode.

[0153] In some embodiments, the outdoor fan 19 is electrically connected to the AC input port 17 to rotate using the input AC power.

[0154] Reference Figure 4-5 The air conditioner further includes a first switch 8. The first switch 8 is arranged between the AC input port 17 and the outdoor fan 19. A first end of the first switch 8 is connected to the AC input port 17, and a second end of the first switch 8 is connected to the outdoor fan 19. The first switch 8 is used to control the AC input port 17 to transmit a power signal to the outdoor fan 19.

[0155] In some embodiments, the first switch 8 is used to receive an electrical signal sent by the controller to control the AC input port 17 to transmit a power signal to the outdoor fan 19 .

[0156] The first switch 8 is used to control whether the components on the outdoor fan 19 side are powered.

[0157] In some embodiments, the AC input port 17 is used to stop transmitting a power signal to the outdoor fan 19 after the first switch 8 is disconnected.

[0158] In some embodiments, the AC input port 17 is used to stop transmitting the power signal to the AC load 18 after the second switch 9 is disconnected.

[0159] In some embodiments, the AC input port 17 and the low power standby circuit are in a normally connected state. The AC input port 17 can be used to transmit a power signal to the low power standby circuit 7 .

[0160] The low power standby circuit 7 is electrically connected to the AC input port 17 so as to transmit the power signal of the AC input port 17 to the standby circuit 20 after the first switch 8 and the second switch 9 are disconnected.

[0161] In this embodiment, the low-power standby circuit and the AC input port are set to be always connected, so that when the outdoor fan end has power supply abnormality or failure, the standby circuit can continue to work, so as to ensure that the fan can be turned on at any time in the standby state.

[0162] In the above embodiment, by disconnecting the first switch 8 and the second switch 9, all AC loads 18 and rectified loads are in a disconnected state, and no power consumption is generated. The low-power standby circuit 7 is powered by the mains, and 5V is output to the minimum control loop of the controller to maintain standby communication.

[0163] In some embodiments, in order to better realize AC power supply. Figure 4 The air conditioner includes a rectifier circuit 10. An input end of the rectifier circuit 10 is connected to a second end of the first switch 8, and is used to convert input alternating current into direct current.

[0164] In some embodiments, reference Figure 5 The air conditioner further includes a filter circuit 11. The filter circuit is used to reduce noise in the input AC power. A first end of the filter circuit 11 is connected to the AC input port 17, a second end of the filter circuit 11 is connected to the first switch 8, and a third end of the filter circuit 11 is connected to the second switch 9.

[0165] In some embodiments, the air conditioner includes a PFC circuit 12. The input end of the PFC circuit 12 is electrically connected to the output end of the rectifier circuit 10. The PFC circuit 12 mainly controls the waveform of the input current to synchronize it with the input voltage waveform, improves the power factor, reduces the harmonic content, and can solve the electromagnetic interference (EMI) and electromagnetic compatibility (EMC) problems caused by severe distortion of the current waveform due to capacitive loads.

[0166] In some embodiments, the air conditioner includes a power conversion circuit 13. A first end of the power conversion circuit 13 is electrically connected to the outdoor fan 19. A second end of the power conversion circuit 13 is connected to an output end of the PFC circuit 12.

[0167] In some embodiments, the power conversion circuit is configured such that, in a first state, the power conversion circuit converts direct current into alternating current and outputs the alternating current to the outdoor fan.

[0168] Under the working condition that the AC input port 17 is used to normally power the outdoor fan 19, after the AC input port 17 inputs AC power, the AC power is rectified into DC power by the rectifier circuit 10, and the power factor is provided under the action of the PFC circuit 12. Then, the DC power can be converted into AC power by the power conversion circuit 13, and supplied to the outdoor fan 19 for rotation.

[0169] In some embodiments, the power conversion circuit is configured such that, in the second state, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into stable direct current and sends it to the low power standby circuit.

[0170] The main working condition described in this application is that in the standby working condition, outdoor natural wind is used to rotate the outdoor fan 19, and the back electromotive force generated by the outdoor fan is supplied to the low-power standby circuit 7 to achieve zero power consumption in the standby working condition.

[0171] In some embodiments, when the outdoor fan 19 is used to generate a back electromotive force and supplied to the low power standby circuit 7, the power conversion circuit 13 can convert the back electromotive force (AC) generated by the rotation of the outdoor fan 19 into DC.

[0172] In some embodiments, the low power standby circuit 7 is electrically connected to the second end of the power conversion circuit 13 so as to transmit a power signal to the low power standby circuit 7 through the power conversion circuit 13 .

[0173] In some embodiments, the idea of ​​zero-power standby mode is to use natural wind to provide energy for the standby load. When the air conditioner is on standby, the outdoor wind will drive the fan of the outdoor fan 19 to rotate, and the power conversion circuit 13 will convert AC power into DC power. At this time, the outdoor fan 19 can be used as a generator.

[0174] In some embodiments, when the air conditioner is in standby mode, the first switch is kept closed.

[0175] In some embodiments, when the fan detection circuit detects that the outdoor fan is not rotating, the first switch is turned off, and the AC power output from the AC input port is used to power the low-power standby circuit.

[0176] In some embodiments, when the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit is used to convert the back electromotive force generated by the rotation of the outdoor fan into stable direct current to supply power to the low-power standby circuit.

[0177] In some embodiments, when the fan detection circuit detects that the outdoor fan is not rotating, the first switch is closed at a certain period during the process of opening the first switch to obtain a detection signal of the fan detection circuit and use it to determine the state of the outdoor fan.

[0178] Reference Fig.11 , describing another control logic in the standby state in an embodiment of the present application.

[0179] The air conditioner is in standby mode (S1101);

[0180] Keep the first switch closed (S1102);

[0181] Determine whether the fan detection circuit detects the rotation of the outdoor fan (S1103);

[0182] In step S1103, if detected, step S1104 is executed to convert the back electromotive force generated by the rotation of the outdoor fan into stable direct current by using the power conversion circuit to supply power to the low-power standby circuit;

[0183] In step S1103, if it is not detected, step S1105 is executed to turn off the first switch and use the AC power output from the AC input port to power the low power standby circuit.

[0184] Determine whether the set period has been reached (S1108);

[0185] In step S1108, if it is reached, step S1106 is executed to close the first switch and determine whether the power conversion circuit detects the rotation of the outdoor fan (S1107);

[0186] In step S1107, if not detected, then execute step S1105 to turn off the first switch;

[0187] In step S1107, if detected, step S1104 is executed;

[0188] In step S1108, if it is not reached, execute step S1108.

[0189] In this embodiment, the input terminal form of the low power standby circuit 7 is changed from AC input to both AC and DC input, and outdoor natural wind is used to generate electricity, and the electricity is used for the standby working condition of the air conditioner to achieve 0W standby.

[0190] In some embodiments, when the air conditioner is in standby mode, the second switch is turned off to stop supplying power to the AC load.

[0191] In some embodiments, reference Fig.12 The controller is configured to: when the air conditioner is in a standby state, close the second switch to stop supplying power to the AC load, and keep the first switch closed.

[0192] When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into stable direct current to supply power to the low-power standby circuit.

[0193] In some embodiments, by opening the second switch 9 and closing the first switch 8, when the back electromotive force generated by the outdoor fan 19 is sufficient for the standby circuit 20, the back electromotive force generated by the outdoor fan 19 can be used to power the standby circuit 20. The control circuit is simple and low-cost. Through control, true low-power or zero-power standby can be achieved, saving electricity for users.

[0194] In the embodiment of the present application, there is no need to set up a backup power supply circuit. The low-power standby circuit 7 can be used to convert external AC power into low-voltage DC power for the controller minimum loop, where the controller minimum loop is a peripheral circuit that maintains the operation of the controller chip, as well as the communication circuit of the indoor unit 16, and the communication between the indoor unit 16 and the wire controller. When the wire controller has a power-on command, it automatically exits the standby mode and the user can use it normally.

[0195] In some embodiments, when a power-on command is received, the first switch is closed, the second switch is closed, and the standby state is exited.

[0196] Reference Figure 6 In some embodiments, the low power standby circuit 7 includes a first input terminal 71 . The first input terminal 71 (L, N) is electrically connected to the AC input port 17 .

[0197] The low power standby circuit 7 includes a second input terminal 72 . The second input terminal 72 (DC+, DC−) is electrically connected to the second terminal of the power conversion circuit 13 .

[0198] The low power standby circuit 7 includes a first output terminal 73. The first output terminal 73 is used to be electrically connected to the standby circuit 20. Figure 6 The first output terminal 73 is used to output a 5V voltage.

[0199] The low power standby circuit 7 includes a switching power module 74. The input end of the switching power module 74 is connected to the first input end 71 and the second input end 72 respectively, and the output end of the switching power module 74 is connected to the second output end. The switching power module 74 selects the power signal of the first input end 71 or the second input end 72 to be transmitted to the first output end 73.

[0200] In some embodiments, the switching power supply module 74 is used to transmit the power signal from the first input terminal 71 to the standby circuit 20 when the DC power after voltage rectification at the first input terminal 71 is greater than the DC power input at the second input terminal 72 .

[0201] In some embodiments, the switching power supply module 74 is used to transmit power from the second input terminal 72 to the standby circuit 20 when the DC power input at the second input terminal 72 is greater than the DC power after voltage rectification at the first input terminal 71 .

[0202] The voltage of the input terminal of the switch power supply module 74 is determined by the magnitude of the electromotive force of the two input terminals. When the electromotive force of one side is higher than that of the other side, the side with the higher electromotive force will naturally be used for power supply. No logical judgment is involved.

[0203] Reference Figure 7 The input AC power (L / N) is 220V, and the switching power supply module 74 internally rectifies it into DC power 310V (DC=√2*AC).

[0204] When there is no voltage on DC+ / DC- or the voltage is lower than DC310V, the L / N mains will provide power for the module to work; when the DC+ / DC- voltage is greater than DC310V, the DC+ / DC- power supply will provide energy for the module to work. At this time, the mains has no output and the power consumption is 0W.

[0205] Reference Figure 7 The low power standby circuit 7 is composed of a switching power supply module 74. The module supports both direct current and alternating current power input. The output low voltage 5V is used to power the minimum loop of the controller.

[0206] The minimum circuit of the controller supplies power to the controller chip and related communication circuits, maintains communication with the indoor unit 16 in the standby state, and when the indoor unit 16 has a power-on command, it exits the standby mode and the air conditioner operates normally.

[0207] In some embodiments, reference Figure 7 The switch power module 74 includes a first sub-diode 741 . The anode of the first sub-diode 741 is connected to the live wire of the AC input port 17 , and the cathode of the first sub-diode 741 is connected to the second end of the power conversion circuit 13 .

[0208] In some embodiments, the switching power module 74 includes a second sub-diode 742 . The cathode of the second sub-diode 742 is connected to the cathode of the first sub-diode 741 and the second end of the power conversion circuit 13 , and the anode of the second sub-diode 742 is connected to the neutral line of the AC input port 17 .

[0209] In some embodiments, the switching power module 74 includes a third sub-diode 743. The cathode of the third sub-diode 743 is connected to the anode of the second sub-diode 742 and the neutral line of the AC input port 17, and the anode of the third sub-diode 743 is connected to the second end of the power conversion circuit 13.

[0210] In some embodiments, the switching power supply module 74 includes a fourth sub-diode 744. The cathode of the fourth sub-diode 744 is connected to the anode of the first sub-diode 741 and the live wire of the AC input port 17, and the anode of the fourth sub-diode 744 is connected to the third sub-diode 743 and the second end of the power conversion circuit 13.

[0211] Reference Figure 7 The low-power standby circuit also includes a diode VD1 and a diode VD2, wherein the positive electrode of the diode VD1 is connected to the DC+ terminal, the positive electrode of the diode VD2 is connected to the DC- terminal, and the negative electrode of the diode VD1 and the negative electrode of the diode VD2 are connected to a capacitor E1, wherein the diode VD1 is connected to the positive electrode of the capacitor E1, and the diode VD2 is connected to the negative electrode of the capacitor E1. The low-power standby circuit stabilizes the input voltage by setting a diode.

[0212] The low power standby circuit includes a capacitor E1, which is connected in parallel to the second input terminal to reduce interference in the circuit. The positive electrode of the capacitor E1 is also connected to the positive electrode of the third sub-diode 743, and the negative electrode of the capacitor E1 is also connected to the negative electrode of the second sub-diode 742.

[0213] A peripheral circuit is arranged between the output terminals vo+, vo- and the first output terminal of the switch power module 74, including an inductor L1, a capacitor E2, a capacitor E3, a capacitor C1 and a capacitor CY1.

[0214] In some embodiments, reference Fig. 9 The air conditioner also includes a fan detection circuit 14.

[0215] The controller can determine whether the zero-power standby mode can be adopted at this time according to the detection signal of the fan detection circuit 14.

[0216] In some embodiments, the fan detection circuit 14 is used to connect with the outdoor fan 19 to detect the fan speed and direction, obtain the fan operation status, and send the fan speed and direction to the controller.

[0217] In some embodiments, the fan detection circuit 14 is used to be electrically connected to the outdoor fan 19 to detect the magnitude of the back electromotive force generated by the outdoor fan 19, and send the detected back electromotive force signal to the controller.

[0218] In some embodiments, the second end of the power conversion circuit 13 is electrically connected to the low power standby circuit 7 so that after the controller receives the detection signal, the power signal is transmitted to the low power standby circuit 7 through the power conversion circuit 13 .

[0219] In some embodiments, when the detection signal detected by the fan detection circuit 14 is insufficient to reach a set threshold, the first switch 8 is opened, and the first switch 8 is closed at a certain period to detect the operation status of the outdoor fan.

[0220] In some embodiments, reference Fig. 9The power conversion circuit 13 includes a first transistor 131 . The base of the first transistor 131 is connected to the first pulse signal, a first diode D1 is connected in series between the collector and the emitter of the first transistor 131 ; and the emitter of the first transistor 131 is electrically connected to the outdoor fan 19 .

[0221] In some embodiments, the power conversion circuit 13 includes a second transistor 132. The base of the second transistor 132 is connected to the second pulse signal, a second diode D2 is connected in series between the collector and the emitter of the second transistor 132, the collector of the second transistor 132 is electrically connected to the collector of the first transistor 131, and the emitter of the second transistor 132 is electrically connected to the outdoor fan 19.

[0222] In some embodiments, the power conversion circuit 13 includes a third transistor 133. The base of the third transistor 133 is connected to the third pulse signal, a third diode D3 is connected in series between the collector and the emitter of the third transistor 133, the collector of the third transistor 133 is electrically connected to the collector of the second transistor 132, and the emitter of the third transistor 133 is electrically connected to the outdoor fan 19.

[0223] In some embodiments, the power conversion circuit 13 includes a fourth transistor 134. The base of the fourth transistor 134 is connected to the fourth pulse signal, and a fourth diode D4 is connected in series between the collector and the emitter of the fourth transistor 134. The collector of the fourth transistor 134 is electrically connected to the emitter of the first transistor 131, and the collector of the fourth transistor 134 is electrically connected to the outdoor fan 19.

[0224] In some embodiments, the power conversion circuit 13 includes a fifth transistor 135. The base of the fifth transistor 135 is connected to the fifth pulse signal, and a fifth diode D5 is connected in series between the collector and the emitter of the fifth transistor 135. The collector of the fifth transistor 135 is electrically connected to the emitter of the second transistor 132, and the collector of the fifth transistor 135 is electrically connected to the outdoor fan 19.

[0225] In some embodiments, the power conversion circuit 13 includes a sixth transistor 136. The base of the sixth transistor 136 is connected to the sixth pulse signal, and a sixth diode D6 is connected in series between the collector and the emitter of the sixth transistor 136 to serve as a freewheeling diode. The collector of the sixth transistor 136 is electrically connected to the emitter of the third transistor 133, and the collector of the sixth transistor 136 is electrically connected to the outdoor fan 19.

[0226] In some embodiments, when the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit acts as a three-phase six-switch PFC circuit to convert the back electromotive force generated by the rotation of the outdoor fan into direct current.

[0227] In some embodiments, the transistor is configured as an NPN type transistor.

[0228] In some embodiments, the second input terminal 72 of the low power standby circuit 7 is electrically connected to the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 to receive the power signal converted into direct current by the power conversion circuit 13.

[0229] Reference Figure 7 , 9 , Fig. 9 The DC+ and DC- ports in the power conversion circuit 13 are connected to Figure 7 DC+ and DC- connections of the medium and low power standby circuit 7.

[0230] When the outdoor unit 14 is operating normally, see Fig. 9 The circuit flow is that after the AC input port 17L / N is filtered and rectified and PFC boosted, the DC bus voltage at DC+ / DC- is increased to the target value, and the power conversion circuit 13 inverts the DC power into AC power, so that the outdoor motor 142 rotates.

[0231] When the natural wind from the outside blows the fan to rotate, the outdoor fan 19 can be in the power generation operation mode. In the power generation operation mode, the AC input port 17L / N does not work.

[0232] The circuit flow is the back electromotive force generated by the motor windings S1 / S2 / S3. The power conversion circuit 13 is reversed to the three-phase six-switch PFC circuit 12, which increases the DC bus voltage at DC+ / DC- to the target value. This voltage is used for the power input of loads such as the low-power standby circuit 7 and the switching power supply 22, achieving a mains power loss of 0W.

[0233] In some embodiments, a formula is used to calculate the back electromotive force generated by the outdoor fan 19. Specifically, the generated back electromotive force = back electromotive force coefficient * rotation speed.

[0234] In some embodiments, a third switch may be provided between the power conversion circuit 13 and the low power consumption standby circuit 7 .

[0235] A speed detection device is provided on the outdoor fan 19 side, and the switch state of the third switch is controlled by judging the fan speed of the outdoor fan 19 to control whether the power conversion circuit 13 supplies power to the low power standby circuit 7 .

[0236] Reference Fig.10 , explaining the control logic under standby condition in this application.

[0237] The air conditioner enters the standby state (S1001);

[0238] The operating status of the outdoor fan 19 is detected (S1002); the fan detection circuit 14 can detect the generated back electromotive force or the speed of the fan. In this control logic, the detection of the speed of the fan is used as an example for explanation.

[0239] Determine whether the speed of the fan reaches a preset speed (S1003);

[0240] In some embodiments, the preset speed n is greater than n1. If n is too small, the back electromotive force generated by the outdoor fan is insufficient to meet the needs of the standby circuit, so n needs to be greater than n1. n1 can be set to 95rpm or 100rpm. It can be set according to actual needs.

[0241] In some embodiments, the preset speed n is less than n2. If n is too large, there will be too few conditions that meet the conditions, making the mode unable to really play a role in practical applications. Therefore, n needs to be less than n2. n2 can be set to 105rpm, 110rpm. It can be set specifically according to actual conditions.

[0242] In step S1003, if it is reached, step S1004 is executed to determine whether this state reaches a preset time;

[0243] By judging the duration of the state that meets the conditions, the stability of the outdoor fan power supply can be effectively improved. And by detecting the fan speed, the stability of the output end of the power conversion circuit can be improved.

[0244] In some embodiments, the preset time t is greater than t1. If t is too small, the back electromotive force generated by the outdoor fan is unstable, affecting the stability of the power supply. Therefore, t needs to be greater than t1. t1 can be set to 7S, 8S, or 9S. It can be set specifically according to actual needs.

[0245] In some embodiments, the preset time t is less than t2. If t is too large, there will be too few cases that meet the conditions, making the mode unable to really play a role in practical applications, so t needs to be less than t2. t2 can be set to 10S, 11S, or 12S. It can be set specifically according to actual conditions.

[0246] In step S1004, if it is reached, step S1006 is executed to open the second switch 9 and close the first switch 8; the air conditioner enters the zero power consumption standby mode;

[0247] MCU detects the back electromotive force of the fan and confirms the operating status of the fan (wind or no wind); when wind is detected, the machine is operated in the power generation mode, so that DC+ / DC- reaches the set value, and the switching power supply 22 and the low-power standby circuit 7 consume energy. The wind energy is converted into electrical energy for circuit load consumption. At this time, the L / N mains input is 0.

[0248] In step S1004, if it is not reached, then execute step S1003;

[0249] In step S1003, if it is not reached, step S1005 is executed to disconnect the first switch 8 and the second switch 9, and the air conditioner enters a low power consumption standby mode;

[0250] All AC loads 18 and rectified loads are disconnected, and no power consumption is generated. The mains LN supplies power to the low-power standby circuit 7, outputs 5V to the MCU minimum control loop, and maintains standby communication.

[0251] At an interval of x minutes, close the first switch 8, exit the low power standby mode, and detect the operating status of the outdoor fan 19 (S1007); execute step S1003.

[0252] In step S1003, when there is wind, the system enters the zero-power standby mode, and when there is no wind, the first switch 8 is disconnected to continue the low-power standby mode.

[0253] When the outdoor unit 14 is in standby mode, the standby power is 0W when there is wind, and the low standby power is as low as less than 1W when there is no wind (the low standby power is about 0.5W according to the actual measurement of the whole machine), thereby optimizing the standby power to the maximum extent and truly saving electricity for users.

[0254] When the outdoor unit 14 receives the power-on command, RY1 and RY2 are closed, the standby mode is exited, and the machine operates normally.

[0255] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0256] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that: include: AC input port, used to output AC power; an outdoor fan, which is used to be electrically connected to the AC input port; A standby circuit, which is used to connect at least an outdoor control circuit and an indoor control circuit; A first switch, which is provided between the AC input port and the outdoor fan, and is used to receive an electrical signal sent by a controller to control the AC input port to transmit a power signal to the outdoor fan; A fan detection circuit, a first end of which is used to be electrically connected to the outdoor fan to detect the rotation speed of the outdoor fan and send a detection signal to the controller; a power conversion circuit, a first end of which is electrically connected to the second end of the fan detection circuit, and a second end of which is electrically connected to the first switch; A low-power standby circuit, wherein the output end of the low-power standby circuit is connected to the standby circuit to output a power signal to the standby circuit; the first input end of the low-power standby circuit is connected to the AC input port to receive AC power, and the second input end of the low-power standby circuit is connected to the second end of the power conversion circuit to receive DC power from the power conversion circuit; The power conversion circuit is configured such that, in a first state, the power conversion circuit converts direct current into alternating current and outputs it to the outdoor fan, and in a second state, the power conversion circuit converts the back electromotive force generated by the rotation of the outdoor fan into stable direct current and sends it to the low-power standby circuit; The controller is configured to: when the air conditioner is in a standby state, keep the first switch closed, and when the fan detection circuit detects that the outdoor fan is not rotating, disconnect the first switch, and use the AC power output from the AC input port to power the low-power standby circuit; When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit is used to convert the back electromotive force generated by the rotation of the outdoor fan into stable direct current to supply power to the low-power standby circuit.

2. The air conditioner according to claim 1, characterized in that: Also includes: AC load; A second switch, a first end of which is connected to the AC input port, and a second end of which is connected to the AC load; The AC input port is used to send a power signal to the AC load after the second switch is closed, and is used to stop sending a power signal to the AC load when the second switch is opened; The controller is configured to, when the air conditioner is in a standby state, turn off the second switch to stop supplying power to the AC load.

3. The air conditioner according to claim 1, characterized in that: The controller is configured to, when the fan detection circuit detects that the outdoor fan is not rotating, close the first switch at a certain period during the process of disconnecting the first switch, and obtain a detection signal from the fan detection circuit to determine the state of the outdoor fan.

4. The air conditioner according to claim 1, characterized in that: The low power standby circuit comprises: a switching power supply module, whose input end is respectively connected to the first input end and the second input end, and whose output end is connected to the standby circuit to output a supply voltage; The switching power supply module can selectively transmit the power signal of the first input end or the second input end to the standby circuit.

5. The air conditioner according to claim 4, characterized in that: The switching power supply module comprises: A first sub-diode, an anode of which is connected to the live wire of the AC input port, and a cathode of which is connected to the second end of the power conversion circuit; a second sub-diode, whose cathode is connected to the cathode of the first sub-diode and the second end of the power conversion circuit, and whose anode is connected to the neutral line of the AC input port; a third sub-diode, whose cathode is connected to the anode of the second sub-diode and the neutral line of the AC input port, and whose anode is connected to the second end of the power conversion circuit; The fourth sub-diode has a cathode connected to the anode of the first sub-diode and the live wire of the AC input port, and an anode connected to the third sub-diode and the second end of the power conversion circuit.

6. The air conditioner according to claim 4, characterized in that: The power conversion circuit comprises: A first transistor, whose base is connected to the first pulse signal, and a first diode is connected in series between the collector and the emitter; the emitter of the first transistor is electrically connected to the outdoor fan; a second triode, whose base is connected to the second pulse signal, a second diode is connected in series between its collector and emitter, the collector of the second triode is electrically connected to the collector of the first triode, and the emitter of the second triode is electrically connected to the outdoor fan; a third triode, whose base is connected to the third pulse signal, a third diode is connected in series between its collector and emitter, the collector of the third triode is electrically connected to the collector of the second triode, and the emitter of the third triode is electrically connected to the outdoor fan; a fourth triode, whose base is connected to the fourth pulse signal, a fourth diode is connected in series between the collector and the emitter, the collector of the fourth triode is electrically connected to the emitter of the first triode, and the collector of the fourth triode is electrically connected to the outdoor fan; a fifth triode, whose base is connected to the fifth pulse signal, a fifth diode is connected in series between its collector and emitter, the collector of the fifth triode is electrically connected to the emitter of the second triode, and the collector of the fifth triode is electrically connected to the outdoor fan; A sixth transistor, whose base is connected to a sixth pulse signal, a sixth diode is connected in series between its collector and emitter, the collector of the sixth transistor is electrically connected to the emitter of the third transistor, and the collector of the sixth transistor is electrically connected to the outdoor fan; When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit acts as a three-phase six-switch PFC circuit to convert the back electromotive force generated by the rotation of the outdoor fan into direct current.

7. The air conditioner according to claim 6, characterized in that: The second input end is electrically connected to the first diode, the second diode, the third diode, the fourth diode, the fifth diode and the sixth diode to receive the power signal converted into direct current by the power conversion circuit.

8. The air conditioner according to claim 1, characterized in that: Also includes: a rectifier circuit, whose input end is electrically connected to the second end of the first switch, and is used to convert the input alternating current into direct current; The PFC circuit has an input end electrically connected to the output end of the rectifier circuit, and the output end of the PFC circuit is electrically connected to the second end of the power conversion circuit.

9. The air conditioner according to claim 2, characterized in that: When a power-on instruction is received, the first switch is closed, the second switch is closed, and the standby state is exited.

10. An air conditioner, characterized in that: include: AC input port, used to output AC power; an outdoor fan, which is used to be electrically connected to the AC input port; AC load; A second switch, a first end of which is connected to the AC input port, and a second end of which is connected to the AC load; A standby circuit, which is used to connect at least an outdoor control circuit and an indoor control circuit; A first switch, which is provided between the AC input port and the outdoor fan, and is used to receive an electrical signal sent by a controller to control the AC input port to transmit a power signal to the outdoor fan; A fan detection circuit, a first end of which is used to be electrically connected to the outdoor fan to detect the rotation speed of the outdoor fan and send a detection signal to the controller; a power conversion circuit, a first end of which is electrically connected to the second end of the fan detection circuit, and a second end of which is electrically connected to the first switch; A low-power standby circuit, wherein the output end of the low-power standby circuit is connected to the standby circuit to output a power signal to the standby circuit; the first input end of the low-power standby circuit is connected to the AC input port to receive AC power, and the second input end of the low-power standby circuit is connected to the second end of the power conversion circuit to receive DC power from the power conversion circuit; The controller is configured to: when the air conditioner is in a standby state, close the second switch to stop supplying power to the AC load, and keep the first switch closed; When the fan detection circuit detects that the outdoor fan is rotating, the power conversion circuit is used to convert the back electromotive force generated by the rotation of the outdoor fan into stable direct current to supply power to the low-power standby circuit.

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