CN114646132A - Power supply system and air conditioner - Google Patents

Abstract

Embodiments of the present application provide a power supply system and an air conditioner, which relate to the technical field of power supply circuits. It includes a first power supply module, a first switch module, a signal output end, a second switch module and a second controller that are electrically connected in sequence, the first controller is respectively electrically connected to the first power supply module and the first switch module, and the second The controller is electrically connected to the second switch module, and the first controller is used to generate a wake-up signal when receiving a power-on command to control the conduction of the first switch module, so that the first power supply module passes through the first switch module and the second switch module. A power signal is output to the second controller to wake up the second controller. By setting the first switch module and the second switch module, the air conditioner can wake up the second controller of the external unit to power on the external unit only after receiving the power-on command, otherwise the external unit will be in a power-off state and will not consume power , thereby reducing the power consumption of the air conditioner when it is in standby, and achieving the effect of saving energy.

Description

Power supply system and air conditioner

technical field

The present invention relates to the technical field of power supply circuits, and in particular, to a power supply system and an air conditioner.

Background technique

With the increase in the utilization rate of air conditioners and the requirements of national energy efficiency standards, the energy-saving function of air conditioners has attracted more and more attention.

At present, when most ordinary air conditioners are in standby, the circuits of the indoor unit and outdoor unit of the air conditioner are in the power-on state. For example, the voltage conversion circuit is always in the working state, which will generate large power consumption and waste energy. .

SUMMARY OF THE INVENTION

The problem solved by the present invention is how to control the power supply mode of the external unit, so as to achieve the effect of reducing the power consumption of the air conditioner when it is in standby and saving energy.

In order to solve the above problems, in the first aspect, an embodiment of the present application provides a power supply system, the power supply system includes an inner unit and an outer unit, and the inner unit includes a first controller, a first power supply module, and a first switch module and a signal output terminal, the external unit includes a second controller and a second switch module, the first power supply module, the first switch module, the signal output terminal, the second switch module and the first switch module The two controllers are electrically connected in sequence, the first controller is electrically connected to the first power supply module and the first switch module, respectively, and the second controller is electrically connected to the second switch module, wherein the the initial state of the second switch module is the first state;

The first controller is configured to generate a wake-up signal when receiving a power-on instruction, and transmit the wake-up signal to the first switch module;

The first switch module is configured to be turned on in response to the wake-up signal, so that the first power supply module outputs a power supply signal to the second controller through the first switch module and the second switch module to Wake up the second controller.

Understandably, by setting the first switch module and the second switch module, the air conditioner can wake up the second controller of the external unit to power on the external unit only after receiving the power-on command, and the external unit can be powered on when the air conditioner is in the standby state. When the air conditioner is in a power-off state, the circuit of the external unit will not consume electricity, thus reducing the power consumption of the air conditioner when it is in standby, and achieving the effect of saving energy.

In an optional implementation manner, the external unit further includes a second power supply module, and the second power supply module, the second switch module and the second controller are electrically connected in sequence;

The second controller is configured to control the second switch module to switch to a second state after a first preset time after being woken up, so that the second power supply module supplies power to the second controller.

It can be understood that by controlling the second switch module to switch to the second state after the first preset time, after the second controller is woken up, the second power supply module of the external unit supplies power to the second controller, so as to realize the external power supply. the normal power supply status of the machine.

In an optional implementation manner, the second switch module includes a SPDT switch, the SPDT switch includes a static contact, a first moving contact and a second moving contact, the static contact is electrically connected to the second controller, the first movable contact is electrically connected to the signal output end, and the second movable contact is electrically connected to the second power supply module;

Wherein, the second switch module is in the first state when the static contact is in conduction with the first movable contact;

The second switch module is in a second state when the stationary contact and the second movable contact are in conduction.

It can be understood that the wake-up and normal modes of the external machine can be switched through two different states of the SPDT switch.

In an optional implementation manner, the external unit further includes a second communication circuit, one end of the second communication circuit is electrically connected to the signal output end, and the other end of the second communication circuit is connected to the signal output end. The second controller is electrically connected.

It can be understood that by setting the second communication circuit, the external unit can transmit communication signals through the second communication circuit after being powered on normally, so as to realize the communication with the internal unit.

In an optional implementation manner, the external unit further includes an optocoupler, and the optocoupler is connected in series between the second communication circuit and the signal output end.

It can be understood that by arranging the optocoupler, the second communication circuit can be isolated from the strong electricity output by the first power supply module when the first switch module is turned on, so as to prevent the second communication circuit from being damaged by the strong electricity.

In an optional implementation manner, the internal unit further includes a first communication circuit, and the first communication circuit, the signal output end, the optocoupler and the second communication circuit are electrically connected in sequence, so that the The first switch module is electrically connected between the first communication circuit and the signal output end, and the first controller is also electrically connected to the first communication circuit;

The first controller is further configured to set the state of the first communication circuit to a communication prohibited state when receiving the power-on command.

It can be understood that by setting the state of the first communication circuit to the prohibited communication state, the first communication circuit does not receive signals, thereby preventing the first communication circuit from being strongly output by the first power supply module when the first switch module is turned on. electrical damage.

In an optional implementation manner, the internal unit further includes a third switch module, and the first power supply module, the third switch module, and the first communication circuit are electrically connected in sequence;

The first controller is further configured to control the third switch module to turn on, control the first switch module to turn off, and control the first switch module to turn off after the second preset time when the first switch module is turned on. The state of a communication circuit is set to a normal communication state.

It can be understood that the second preset time is at least greater than the time required for the external unit to work normally from power-on. After the second preset time of the first switch module being turned on, the third switch module is controlled to be turned on and controlled. The first switch module is disconnected, and the state of the first communication circuit is set to the normal communication state, so that after the external unit works normally, the internal unit works normally and exits the wake-up module.

In an optional implementation manner, the first controller is further configured to control the third switch module to disconnect when the external machine data transmitted by the external machine is not received within a preset waiting period, and control the first switch module to be turned on again.

It can be understood that if the external machine data transmitted by the external machine is not received within the preset waiting period, it means that the external machine is not powered during the current waiting period, so the third switch module is controlled again to disconnect and control the first switch. The module turns on, thereby re-executing the wake-up operation.

In an optional implementation manner, the first controller is further configured to generate fault prompt information when the external machine data transmitted by the external machine is not received within a preset number of the waiting periods.

It can be understood that if the external machine data transmitted by the external machine is not received within the preset number of the waiting periods, it means that the external machine is not powered on after multiple wake-up operations, and the external machine may be faulty, so the Error message.

In an optional implementation manner, the first controller is further configured to transmit the shutdown instruction to the second controller when receiving the shutdown instruction;

The second controller is configured to control the second switch module to switch to the first state after a fourth preset time in response to the shutdown command, and feed back shutdown information to the first controller;

The first controller is configured to control the first communication circuit to switch to a communication prohibited state according to the shutdown information, and to control the third switch module to be disconnected.

Understandably, when the shutdown operation is performed, the power supply of the external unit needs to be cut off first, and then the power supply of the internal unit needs to be cut off.

In a second aspect, an embodiment of the present application further provides an air conditioner, where the air conditioner includes the power supply system described in any one of the foregoing embodiments.

Description of drawings

FIG. 1 is a block diagram of a circuit structure of a power supply system provided by an embodiment of the present application.

FIG. 2 is a circuit diagram of a power supply system provided by an embodiment of the present application.

FIG. 3 is a working sequence diagram of the power supply system provided by the embodiment of the present application.

Icons: 10-power supply system; 100-internal unit; 110-first controller; 120-first power supply module; 130-first switch module; 140-first communication circuit; 150-third switch module; 160-signal Output end; 200-outdoor unit; 210-second controller; 220-second switch module; 230-second power supply module; 240-second communication circuit; 250-optical coupler.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

The embodiment of the present application provides a power supply system 10 , which is mainly applied to an air conditioner powered by an external unit 200 . Please refer to FIG. 1 , which is a block diagram of a circuit structure of a power supply system 10 according to an embodiment of the present application. The power supply system 10 includes an internal unit 100 and an external unit 200. The internal unit 100 includes a first controller 110, a first power supply module 120, a first switch module 130, a first communication circuit 140, a third switch module 150 and a signal output terminal Step 160 , the external unit 200 includes a second controller 210 , a second switch module 220 , a second power supply module 230 , a second communication circuit 240 and an optocoupler 250 .

The first power supply module 120, the first switch module 130, the signal output terminal 160, the second switch module 220 and the second controller 210 are electrically connected in sequence, the first power supply module 120, the third switch module 150, the first communication circuit 140. The signal output terminal 160 is electrically connected in sequence, the signal output terminal 160, the optocoupler 250, the second communication circuit 240 and the second controller 210 are electrically connected in sequence, the second power supply module 230, the second switch module 220 and the second controller 210 are electrically connected in sequence, and the first controller 110 is further electrically connected with the first power supply module 120 , the first switch module 130 , the first communication circuit 140 and the third switch module 150 respectively.

The first power supply module 120 is electrically connected to the first switch module 130 and the first control module, and is used for providing the first control module with a working voltage and a power signal for waking up the external device 200 . Understandably, the first power supply module 120 may include components such as a power supply, a rectifier bridge, and a transformer, which convert the AC power output by the power supply into DC power through the rectifier bridge and the transformer, so as to provide the first control module with a working voltage. In addition, the first power supply module 120 (power supply) can also directly output an AC voltage of 220V to the first switch module 130 to provide a power signal for waking up the external device 200 . It should be noted that the power supply is conventional mains, which is used to output 220V AC signals, including live wire (L) and neutral wire (N).

The first switch module 130 is configured to switch states under the control of the first controller 110 , so as to control whether the first power supply module 120 can output a power signal to the external unit 200 . It should be noted that the first switch module 130 is in the off state by default, and can be switched to the on state after receiving the control signal from the first controller 110, so that the alternating current provided by the first power supply module 120 can pass through The first switch module 130 and the signal output terminal 160 are connected to the external unit 200 .

Please refer to FIG. 2 , which is a circuit diagram of a power supply system 10 according to an embodiment of the present application. It can be seen that the first switch module 130 may include a normally open relay. Understandably, a normally open relay is always in an open state when its coil is not energized, and can switch to a closed state after the coil is energized. Therefore, the first controller 110 can control the state of the first switch module 130 by controlling the current on and off of the coil.

The first communication circuit 140 is used to realize data exchange between the internal unit 100 and the external unit 200 . The first communication circuit 140 may include two states, a normal communication state and a communication prohibited state. The state of the first communication circuit 140 can be controlled by the first controller 110 . Understandably, when the first communication circuit 140 is in a normal communication state, the first communication circuit 140 can transmit a communication voltage of 24V or 54V; and when the first communication circuit 140 is in a communication prohibited state, the first communication circuit 140 can transmit a communication voltage of 24V or 54V. 140 doesn't work.

In an optional implementation manner, the first controller 110 may set the state of the first communication circuit 140 by controlling the transmit data (Transmit Data, TXD) of the internal unit 100 . Specifically, if the first controller 110 sets RXD to 0, the first communication circuit 140 is in a communication prohibited state; if the first controller 110 sets RXD to 1, the first communication circuit 140 is in a normal communication state.

The third switch module 150 is configured to switch states under the control of the first controller 110 so as to control the normal power supply and communication states of the internal unit 100 . The third switch module 150 is in an off state by default, and can be switched to an on state after receiving a control signal from the first controller 110 , so that the first power supply module 120 can pass through the third switch module 150 . The first communication circuit 140 transmits signals.

In an optional implementation manner, the third switch module 150 may also be a normally open relay. Before receiving the control signal from the first controller 110, the third switch module 150 is always in an off state, and only Only after receiving the control signal will it switch to the conducting state.

Please continue to refer to FIG. 2 , the live wire of the first power supply module 120 is connected in series with the first resistor R1 , the first switch module 130 , the anode of the first diode D1 , the cathode of the first diode D1 , and the first communication circuit 140 . It is electrically connected to the signal output end 160, the first communication circuit 140 is also electrically connected to the neutral line of the first power supply module 120, and the internal unit 100 further includes a first capacitor C1 and a second diode D2, a first capacitor C1 and a second diode D2. C1 is connected in parallel with the first communication circuit 140 , the anode of the second diode D2 is electrically connected to the live wire N, and the cathode of the second diode D2 is electrically connected to the neutral wire L.

Understandably, by setting the first resistor R1, the current value on the loop can be limited. By arranging the first diode D1, reverse damage to the first power supply module 120 can be avoided when a fault current occurs in the circuit. By arranging the second diode D2 and the first capacitor C1, a voltage drop between the live wire N and the neutral wire L of the first power supply module 120 can be ensured, and the short circuit problem caused by the direct connection of the live wire N and the neutral wire L can be avoided.

One end of the second switch module 220 is electrically connected to both the signal output end 160 and the second power supply module 230 , and the other end of the second switch module 220 is electrically connected to the second controller 210 . The second switch module 220 is configured to switch states under the control of the second controller 210 to change the connection state of the second switch module 220 with the signal output terminal 160 and the second power supply module 230 .

The second switch module 220 includes a first state and a second state. By default, the second switch module 220 is in the first state. At this time, the second switch module 220 is connected to the signal output terminal 160 and disconnected from the second power supply module 230 ; and under the control of the second controller 210, The second switch module 220 can be switched from the first state to the second state, and when the second switch module 220 is in the second state, the second switch module 220 is connected to the second power supply module 230 and disconnected from the signal output terminal 160 .

Please continue to refer to FIG. 2 , the second switch module 220 includes a SPDT switch, the SPDT switch includes a static contact, a first moving contact and a second moving contact, the static contact is electrically connected to the second controller 210 , The first movable contact is electrically connected to the signal output end 160 , and the second movable contact is electrically connected to the second power supply module 230 . It can be seen that when the static contact is connected to the first movable contact, the second switch module 220 is in the first state; when the static contact is connected to the second moving contact, the second switch module 220 is in the second state state.

The second communication circuit 240 is used to communicate with the first communication circuit 140 for data exchange between the internal unit 100 and the external unit 200 . For example, the shutdown command transmitted by the first communication circuit 140 is forwarded to the second controller 210 , or the operation data of the external machine 200 is transmitted to the first communication circuit 140 .

By arranging the optocoupler 250 and connecting the optocoupler 250 in series between the second communication circuit 240 and the signal output terminal 160 , the output of the first power supply module 120 can be isolated for the second communication circuit 240 when the first switch module 130 is turned on. Strong electricity, to prevent the second communication circuit 240 from being damaged by strong electricity.

The first controller 110 is used to control the states of the first switch module 130 , the first communication circuit 140 , and the third switch module 150 , so that the internal unit 100 switches between different states.

Specifically, the first controller 110 is configured to generate a wake-up signal when receiving a power-on instruction, and transmit the wake-up signal to the first switch module 130; the first switch module 130 is configured to turn on in response to the wake-up signal, so as to enable the first power supply The module 120 outputs a power signal to the second controller 210 through the first switch module 130 and the second switch module 220 to wake up the second controller 210 .

It can be understood that by controlling the first switch module 130 to be turned on, the first power supply module 120 can output a power signal to the second controller 210 , so that the second controller 210 is powered on and the effect of waking up the second controller 210 is achieved. . In addition, the second controller 210 will be woken up only after receiving the power-on command. Otherwise, the second controller 210 and even the external unit 200 will not be powered, so that the circuit of the external unit 200 will not consume power. power consumption to save energy.

The second controller 210 is configured to control the second switch module 220 to switch to the second state after the first preset time after being woken up, so that the second power supply module 230 supplies power to the second controller 210 .

It can be understood that by controlling the second switch module 220 to switch to the second state after the first preset time, after the second controller 210 is woken up, the second power supply module 230 of the external unit 200 can be the second controller 210 supplies power to realize the normal power supply state of the external unit 200 .

Please continue to refer to FIG. 2, the external unit 200 further includes a thermistor PTC, a second capacitor C2 and a detector, the signal output terminal 160, the thermistor PTC and the first moving contact of the SPDT switch are electrically connected in sequence, and the detector The two input ends of the single-pole double-throw switch are respectively electrically connected to the static contact of the SPDT switch and the second communication circuit 240, the two output ends of the detector are electrically connected to the second controller 210, and the two ends of the second capacitor C2 are respectively connected to the detector The two output terminals are electrically connected.

Understandably, when the first switch module 130 is turned on, the first power supply module 120 charges the second capacitor C2 through the thermistor PTC, and the first preset time is the time required to fully charge the second capacitor C2 .

The first controller 110 is further configured to set the state of the first communication circuit 140 to a communication prohibited state when receiving a power-on command.

It can be understood that by setting the state of the first communication circuit 140 to a communication prohibited state, the first communication circuit 140 does not receive a signal, thereby preventing the first communication circuit 140 from receiving the first power supply when the first switch module 130 is turned on. Damage to the strong electricity output by the module 120 .

The first controller 110 is further configured to control the third switch module 150 to turn on, control the first switch module 130 to turn off, and control the state of the first communication circuit 140 after the second preset time when the first switch module 130 is turned on. Set to normal communication state.

It can be understood that the second preset time is at least greater than the time required by the external unit 200 from power-on to normal operation. After the second preset time when the first switch module 130 is turned on, the third switch module 150 is controlled to be turned on. Turn on and control the first switch module 130 to disconnect, and set the state of the first communication circuit 140 to the normal communication state, so that after the external unit 200 works normally, the internal unit 100 works normally and exits the wake-up module. It should be noted that the second preset time is greater than the first preset time.

The first controller 110 is further configured to control the third switch module 150 to turn off, and control the first switch module 130 to turn on again when the data of the external device 200 transmitted by the external device 200 is not received within the preset waiting period.

Understandably, if the data of the external unit 200 transmitted by the external unit 200 is not received within the preset waiting period, it means that the external unit 200 is not powered on in the current waiting period, so the third switch module 150 is controlled to be disconnected and turned off again. The first switch module 130 is controlled to be turned on, so as to perform the wake-up operation again.

The first controller 110 is further configured to generate fault prompt information when the data of the external device 200 transmitted by the external device 200 is not received within a preset number of waiting periods.

Understandably, if the data of the external device 200 transmitted by the external device 200 is not received within the preset number of the waiting periods, it means that the external device 200 is not powered on by multiple wake-up operations, and the external device 200 may exist. failure, so a failure message is generated. It should be noted that the preset number can be set according to the actual needs of the user.

The first controller 110 is further configured to transmit the shutdown command to the second controller 210 when receiving the shutdown command; the second controller 210 is configured to control the second switch module 220 after a fourth preset time in response to the shutdown command Switch to the first state, and feed the shutdown information to the first controller 110; the first controller 110 is used to control the first communication circuit 140 to switch to the communication prohibited state according to the shutdown information, and control the third switch module 150 to disconnect.

It should be noted that, when there are multiple internal units 100 , the second controller 210 controls the second switch module 220 to switch to the first state only after receiving shutdown commands transmitted by all the internal units 100 .

Please refer to FIG. 3 to describe the work flow of the present application: when the power-on command is received at time T2, the relay K1 is controlled to be turned on and the TXD signal of the internal unit 100 is set to 0, so that the second controller 210 is woken up, and After k seconds, the control relay K2 is switched to the second state, so that the external unit 200 is powered on; at the Nth second, the control relay K3 is disconnected, and the TXD signal of the internal unit 100 is set to 1, so that the internal unit 100, the external unit 200 normal communication. Wherein, k is the first preset time, and N is the second preset time.

The embodiment of the present application also provides a power supply system 10, the power supply system 10 includes a plurality of internal units 100 and an external unit 200, the external unit 200 includes the same number of second communication circuits 240 as the number of the internal units 100, each external unit 100 The signal output end 160 of the machine 200 is electrically connected to the optocoupler 250 of the external machine 200 and the corresponding second communication circuit 240 respectively, and is also electrically connected to the second control module of the external machine 200 .

It should be noted that the wake-up principle of multiple internal units 100 is the same as that of one internal unit 100 , and the specific content refers to the power supply system 10 provided in the foregoing embodiment, which is not specifically limited here.

Embodiments of the present application further provide an air conditioner, where the air conditioner includes the power supply system 10 provided in any of the foregoing embodiments.

To sum up, the power supply system and the air conditioner provided by the embodiments of the present application include an inner unit and an outer unit, the inner unit includes a first controller, a first power supply module, a first switch module and a signal output end, and the outer unit includes a first controller, a first power supply module, a first switch module and a signal output terminal. Two controllers and a second switch module, the first power supply module, the first switch module, the signal output terminal, the second switch module and the second controller are electrically connected in sequence, and the first controller is respectively connected with the first power supply module and the first switch The module is electrically connected, and the second controller is electrically connected to the second switch module, wherein the initial state of the second switch module is the first state, and the first controller is used to generate a wake-up signal when receiving a power-on command, and send a signal to the first switch The module transmits a wake-up signal, and the first switch module is turned on in response to the wake-up signal, so that the first power supply module outputs a power signal to the second controller through the first switch module and the second switch module to wake up the second controller. By setting the first switch module and the second switch module, the air conditioner can wake up the second controller of the external unit to power on the external unit only after receiving the power-on command, and when the air conditioner is in the standby state, the external unit is all off. In the power state, the circuit of the external unit will not consume power, thus reducing the power consumption of the air conditioner when it is in standby, and achieving the effect of saving energy.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (11)

1. A power supply system (10), characterized in that the power supply system (10) comprises an internal unit (100) and an external unit (200), the inner machine (100) comprises a first controller (110), a first power supply module (120), a first switch module (130) and a signal output end (160), the outdoor unit (200) includes a second controller (210) and a second switch module (220), the first power supply module (120), the first switch module (130), the signal output end (160), the second switch module (220) and the second controller (210) are electrically connected in sequence, the first controller (110) is electrically connected with the first power supply module (120) and the first switch module (130) respectively, the second controller (210) is electrically connected with the second switch module (220), wherein the initial state of the second switch module (220) is a first state;

the first controller (110) is configured to generate a wake-up signal when receiving a power-on instruction, and transmit the wake-up signal to the first switch module (130);

the first switch module (130) is used for responding to the wake-up signal and conducting, so that the first power supply module (120) outputs a power supply signal to the second controller (210) through the first switch module (130) and the second switch module (220) to wake up the second controller (210).

2. The power supply system (10) according to claim 1, wherein the external unit (200) further comprises a second power supply module (230), and the second power supply module (230), the second switch module (220) and the second controller (210) are electrically connected in sequence;

the second controller (210) is configured to control the second switch module (220) to switch to the second state after being awakened for a first preset time, so that the second power supply module (230) supplies power to the second controller (210).

3. The power supply system (10) of claim 2, wherein the second switch module (220) comprises a single pole double throw switch comprising a stationary contact electrically connected to the second controller (210), a first movable contact electrically connected to the signal output (160), and a second movable contact electrically connected to the second power supply module (230);

wherein the second switch module (220) is in a first state when the stationary contact is in conduction with the first movable contact;

when the fixed contact is conducted with the second movable contact, the second switch module (220) is in a second state.

4. The power supply system (10) according to claim 1, wherein the outdoor unit (200) further comprises a second communication circuit (240), one end of the second communication circuit (240) is electrically connected to the signal output terminal (160), and the other end of the second communication circuit (240) is electrically connected to the second controller (210).

5. The power supply system (10) of claim 4, wherein the external unit (200) further comprises an optocoupler (250), the optocoupler (250) being connected in series between the second communication circuit (240) and the signal output (160).

6. The power supply system (10) according to claim 5, wherein the internal unit (100) further comprises a first communication circuit (140), the signal output terminal (160), the optical coupler (250) and the second communication circuit (240) are electrically connected in sequence, the first switch module (130) is electrically connected between the first communication circuit (140) and the signal output terminal (160), and the first controller (110) is further electrically connected with the first communication circuit (140);

the first controller (110) is further configured to set a state of the first communication circuit (140) to a communication disabled state upon receiving the power-on command.

7. The power supply system (10) according to claim 6, wherein the internal unit (100) further includes a third switch module (150), and the first power supply module (120), the third switch module (150), and the first communication circuit (140) are electrically connected in sequence;

the first controller (110) is further configured to control the third switch module (150) to be turned on, control the first switch module (130) to be turned off, and set the state of the first communication circuit (140) to be a normal communication state after a second preset time when the first switch module (130) is turned on.

8. The power supply system (10) of claim 7, wherein the first controller (110) is further configured to control the third switching module (150) to turn off and control the first switching module (130) to turn on again when the data of the external unit (200) transmitted by the external unit (200) is not received within a preset waiting period.

9. The power supply system (10) of claim 8, wherein the first controller (110) is further configured to generate a fault notification message when data of the outdoor unit (200) transmitted by the outdoor unit (200) is not received within a preset number of the waiting periods.

10. The power supply system (10) of claim 7, wherein the first controller (110) is further configured to transmit a shutdown instruction to the second controller (210) upon receiving the shutdown instruction;

the second controller (210) is configured to control the second switch module (220) to switch to the first state after a fourth preset time in response to the shutdown instruction, and feed shutdown information back to the first controller (110);

the first controller (110) is configured to control the first communication circuit (140) to switch to a disabled communication state according to the shutdown information, and control the third switch module (150) to turn off.

11. An air conditioner, characterized in that it comprises a power supply system (10) according to any one of claims 1-10.

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