Power supply circuit of indoor unit, and air conditioner

Abstract

A power supply circuit of an indoor unit, and an air conditioner. The power supply circuit is applied to an air conditioner, wherein the air conditioner further comprises a wired controller. The power supply circuit comprises: a low-voltage power supply module, which is disposed at a wired controller, wherein an input end of the low-voltage power supply module is connected to a reference power source end, and a first output end of the low-voltage power supply module is suitable for being connected to an indoor unit main control module; the reference power source end is used for providing a first direct current; and the low-voltage power supply module is configured to perform voltage conversion on the first direct current, and output a second direct current by means of the first output end of the low-voltage power supply module, so as to supply power to the indoor unit main control module. Thus, the circuit supplies power to an indoor unit main control module by means of a low-voltage power supply module in a wired controller, such that when a power source of an indoor unit is abnormal, the indoor unit main control module can still be kept in an online state on the basis of a second direct current provided by the wired controller, thereby improving the operation stability of the air conditioner.

Description

The power supply circuit of the indoor unit and the air conditioner

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese patent application No. 202411479687.1, filed on October 22, 2024, entitled "Power Supply Circuit for Indoor Unit and Air Conditioner", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of indoor unit power supply technology, and in particular to a power supply circuit for an indoor unit and an air conditioner. Background Technology

[0004] In related technologies, a single-pipe multi-split air conditioning system includes multiple indoor units, each with a corresponding power supply circuit that draws power from the mains to supply power to the indoor unit's electronic control system. When the power supply circuit in an indoor unit fails, the indoor unit's main control module will be unable to continue performing control actions due to power failure, reducing the operational stability of the air conditioner. Summary of the Invention

[0005] An indoor unit power supply circuit and air conditioner, which supplies power to the indoor unit main control module through a low-voltage power supply module in the wired controller, so that when the power supply of the indoor unit is abnormal, the indoor unit main control module can still remain online based on the second DC power provided by the wired controller, thereby improving the operational stability of the air conditioner.

[0006] In a first aspect, this disclosure proposes a power supply circuit for an indoor unit, applied to an air conditioner. The air conditioner also includes a wired controller. The power supply circuit for the indoor unit includes: a low-voltage power supply module disposed on the wired controller. The input terminal of the low-voltage power supply module is connected to a reference power supply terminal. The first output terminal of the low-voltage power supply module is adapted to be connected to the main control module of the indoor unit. The reference power supply terminal is used to provide a first DC power. The low-voltage power supply module is configured to perform voltage conversion on the first DC power and output a second DC power through the first output terminal of the low-voltage power supply module to power the main control module of the indoor unit.

[0007] This technology is applied to air conditioners, which also include a wired controller. The power supply circuit for the indoor unit includes a low-voltage power supply module located in the wired controller. The input terminal of the low-voltage power supply module is connected to a reference power supply terminal, and the first output terminal of the low-voltage power supply module is adapted to be connected to the indoor unit's main control module. The reference power supply terminal provides a first DC power supply. The low-voltage power supply module is configured to convert the voltage of the first DC power supply and output a second DC power supply through its first output terminal to power the indoor unit's main control module. Thus, this circuit supplies power to the indoor unit's main control module through the low-voltage power supply module within the wired controller. Therefore, even when the indoor unit's power supply is abnormal, the indoor unit's main control module can still remain online based on the second DC power supply provided by the wired controller, improving the air conditioner's operational stability.

[0008] The power supply circuit of the indoor unit also includes: a DC-DC conversion module located in the indoor unit, the input terminal of the DC-DC conversion module is connected to the output terminal of the low-voltage power supply module, the output terminal of the DC-DC conversion module is connected to the power supply terminal of the indoor unit main control module, and the DC-DC conversion module is configured to convert the second DC power and output the third DC power.

[0009] The power supply circuit of the indoor unit also includes: a high-voltage power supply module located in the indoor unit, the input terminal of the high-voltage power supply module being connected to a first external AC source, and the output terminal of the high-voltage power supply module being connected to the high-voltage power supply terminal of the fan drive module, wherein the first external AC source is used to provide a first AC power; the high-voltage power supply module is configured to perform AC-DC conversion on the first AC power and output a fourth DC power to provide high-voltage power to the fan drive module, wherein the fourth DC power is greater than the second DC power;

[0010] The power supply circuit of the indoor unit also includes: a controllable switch located in the indoor unit, the controllable switch being connected in series between the input terminal of the high-voltage power supply module and the first external AC source, and the control terminal of the controllable switch being connected to the first output terminal of the indoor unit main control module;

[0011] The controllable switch is a relay. The power supply terminal of the relay coil is connected to the output terminal of the low-voltage power supply module, the control terminal of the relay coil is connected to the first output terminal of the indoor unit main control module, and the main contacts of the relay are connected in series between the input terminal of the high-voltage power supply module and the first external AC source.

[0012] The power supply circuit of the indoor unit also includes: an isolated power supply module located in the indoor unit, the input terminal of the isolated power supply module being connected to the output terminal of the low-voltage power supply module, the output terminal of the isolated power supply module being connected to the low-voltage power supply terminal of the fan drive module, the isolated power supply module being configured to generate a fifth DC power based on a second DC power to provide low-voltage power to the fan drive module; the output terminal of the high-voltage power supply module being connected to the high-voltage power supply terminal of the fan drive module.

[0013] The power supply circuit of the indoor unit also includes: a rectifier module located on the wired controller, the input terminal of the rectifier module being connected to a second external AC source, and the output terminal of the rectifier module being connected to the input terminal of a low-voltage power supply module, wherein the second external AC source is used to provide a second AC power; the rectifier module is configured to convert the second AC power to AC-DC and output a first DC power.

[0014] Secondly, this disclosure proposes an air conditioner, including an indoor unit, a wired controller, and a power supply circuit for the aforementioned indoor unit.

[0015] According to the air conditioner of the present disclosure embodiment, based on the power supply circuit of the indoor unit described above, the main control module of the indoor unit is powered through the low-voltage power supply module in the wired controller, so that when the power supply of the indoor unit is abnormal, the main control module of the indoor unit can still remain online based on the second DC power provided by the wired controller, thereby improving the operational stability of the air conditioner.

[0016] In addition, the air conditioner according to the above embodiments of this disclosure may also have the following additional technical features:

[0017] The wired controller also includes: a wired controller main control module, the power supply terminal of which is connected to the second output terminal of the low-voltage power supply module. The low-voltage power supply module is also configured to convert the first DC power and output a sixth DC power through the second output terminal of the low-voltage power supply module to power the wired controller main control module.

[0018] The communication terminal of the wired controller main control module is connected to the first output terminal of the low-voltage power supply module and the communication terminal of the indoor unit main control module, respectively, so as to realize communication between the wired controller main control module and the indoor unit main control module based on the second DC power.

[0019] The air conditioner also includes an outdoor unit, which includes an outdoor unit main control module. The second communication terminal of the indoor unit main control module is connected to the communication terminal of the outdoor unit main control module.

[0020] The indoor unit also includes: an electronic expansion valve drive module and an electronic expansion valve. The input end of the electronic expansion valve drive module is connected to the second output end of the indoor unit main control module, and the output end of the electronic expansion valve drive module is connected to the electronic expansion valve.

[0021] The indoor unit main control module is also configured to: acquire the operating parameters of the fan drive module; determine the current operating mode of the air conditioner if the fan drive module is in an abnormal operating state based on the operating parameters; and control the electronic expansion valve based on the current operating mode.

[0022] The operating parameters include the input voltage of the high-voltage power supply terminal of the fan drive module. The indoor unit main control module is also configured to determine that the fan drive module is in an abnormal operating state when the input voltage is zero.

[0023] The indoor unit's main control module is also configured to determine the target opening degree based on the current operating mode; and control the electronic expansion valve according to the target opening degree.

[0024] The indoor unit's main control module is also configured to determine the target opening degree as the first opening degree value when the current working mode is heating mode; and to determine the target opening degree as zero when the current working mode is non-heating mode, wherein the first opening degree value is greater than zero.

[0025] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic diagram of the power supply circuit of the indoor unit according to an embodiment of the present disclosure;

[0028] Figure 2 is a schematic diagram of the power supply circuit of an indoor unit according to a specific embodiment of the present disclosure;

[0029] Figure 3 is a connection diagram of an air conditioner according to an embodiment of the present disclosure;

[0030] Figure 4 is a connection diagram of an air conditioner according to a specific embodiment of the present disclosure;

[0031] Figure 5 is a flowchart of a control method for an indoor main control module according to a specific embodiment of the present disclosure. Detailed Implementation

[0032] The embodiments of this disclosure are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of this disclosure are described in detail below.

[0033] The power supply circuit of the indoor unit and the air conditioner according to embodiments of this disclosure are described below with reference to the accompanying drawings.

[0034] Figure 1 is a schematic diagram of the power supply circuit of the indoor unit according to an embodiment of the present disclosure.

[0035] As shown in Figure 1, the power supply circuit 100 of the indoor unit in this embodiment of the present disclosure is applied to an air conditioner. The air conditioner also includes a wired controller 300. The power supply circuit 100 of the indoor unit includes a low-voltage power supply module 10 disposed in the wired controller 300. The input terminal of the low-voltage power supply module 10 is connected to a reference power supply terminal. The first output terminal of the low-voltage power supply module 10 is adapted to be connected to the indoor unit main control module 210. The reference power supply terminal is used to provide a first DC power DC-VCC1. The low-voltage power supply module 10 is configured to perform voltage conversion on the first DC power DC-VCC1 and output a second DC power DC-VCC2 through the first output terminal of the low-voltage power supply module 10 to power the indoor unit main control module 210.

[0036] Specifically, the power supply circuit 100 of the indoor unit is applicable to multi-split air conditioning systems to provide power to the corresponding indoor unit main control module 210. In a multi-split air conditioning system, each indoor unit 200 is equipped with an indoor unit main control module 210. The indoor unit main control module 210 is used to control the load within the indoor unit 200, such as the fan, electronic expansion valve, etc., and to communicate with the outdoor unit. The low-voltage power supply module 10 can be a step-down module to step down the first DC power DC-VCC1 to a second DC power DC-VCC2 to power the indoor unit main control module 210. It can be understood that the second DC power DC-VCC1 can directly power the indoor unit main control module 210, or it can be further converted by other circuits to power the indoor unit main control module 210; there are no specific limitations. The reference power supply terminal can be powered by the power supply circuit or by an external DC source; there are no specific limitations.

[0037] Therefore, this embodiment provides power to the indoor unit main control module 210 by setting a low-voltage power supply module 10 in the online controller 300, so that the indoor unit main control module 210 is not affected by the power supply circuit in the indoor unit 200. Even if the power supply circuit in the indoor unit fails, it can still continue to operate with power, so that the indoor unit main control module 210 can perform abnormal control in time, which is more conducive to the operation stability of the air conditioner.

[0038] Referring to Figure 2, in one embodiment of this disclosure, the power supply circuit 100 of the indoor unit further includes: a DC-DC conversion module 20 disposed in the indoor unit 200, the input terminal of the DC-DC conversion module 20 being connected to the output terminal of the low-voltage power supply module 10, the output terminal of the DC-DC conversion module 20 being connected to the power supply terminal of the indoor unit main control module 210, and the DC-DC conversion module 20 being configured to perform voltage conversion on the second DC power DC-VCC2 and output a third DC power DC-VCC3.

[0039] Specifically, taking the DC-DC converter module 20 as a BUCK circuit (step-down converter circuit) as an example, assuming the second DC power supply DC-VCC2 is 12V, and the indoor unit main control module 210 requires a power supply voltage of 5V, then the DC-DC converter module 20 receives the second DC power supply DC-VCC2 provided by the low-voltage power supply module 10 and steps it down to output a third DC power supply DC-VCC3 of 5V, which is used to power the indoor unit main control module 210. It can be understood that the DC-DC converter module 20 may include functions such as step-down, step-up, and filtering; the specific circuit selection can be based on the actual situation.

[0040] In one embodiment of this disclosure, the power supply circuit 100 of the indoor unit further includes: a high-voltage power supply module 30 disposed in the indoor unit 200, the input terminal of the high-voltage power supply module 30 being connected to a first external AC source 400, and the output terminal of the high-voltage power supply module 30 being connected to the high-voltage power supply terminal of the fan drive module 220, wherein the first external AC source 400 is used to provide a first AC power AC-VCC1; the high-voltage power supply module 30 is configured to perform AC-DC conversion on the first AC power AC-VCC1 and output a fourth DC power DC-VCC4 to provide high-voltage power to the fan drive module 220, wherein the fourth DC power DC-VCC4 is greater than the second DC power DC-VCC2.

[0041] Specifically, the first external AC source 400 can be the mains power network, and the first AC power AC-VCC1 is AC220V high-voltage AC power. Referring to Figure 2, the high-voltage power supply module 30 is connected to the first external AC source 400 through the AC220V input port to receive the first AC power AC-VCC1 provided by the first external AC source 400, and converts the first AC power AC-VCC1 into a fourth DC power DC-VCC4 for providing high-voltage power to the fan drive module 220. The high-voltage power supply module 30 can be a bridge full-wave rectifier circuit composed of rectifier diodes, and may also include a filter circuit, etc., depending on the specific circuit selection required.

[0042] In one embodiment of this disclosure, the power supply circuit 100 of the indoor unit further includes: a controllable switch 40 disposed in the indoor unit 200, the controllable switch 40 being connected in series between the input terminal of the high voltage power supply module 30 and the first external AC source 400, and the control terminal of the controllable switch 40 being connected to the first output terminal of the indoor unit main control module 210.

[0043] Specifically, the controllable switch 40 can be a relay, a transistor, or an IGBT (Insulated-Gate Bipolar Transistor). The controllable switch 40 is a normally open switch. During operation, the low-voltage power supply module 10 supplies power to the indoor unit's main control module 210. After the indoor unit's main control module 210 is powered on, it closes the controllable switch 40, thereby allowing the first external AC source 400 to supply power to the high-voltage power supply module 30. Simultaneously, during operation, the indoor unit's main control module 210 can control the controllable switch 40 to close or open based on detection results and control commands, thereby improving electrical safety. Furthermore, the controllable switch 40 also solves the problem of the indoor unit carrying high voltage in standby mode, thus reducing standby power consumption and improving standby safety.

[0044] In one embodiment of this disclosure, the controllable switch 40 is a relay, the power supply terminal of the relay coil is connected to the output terminal of the low-voltage power supply module 10, the control terminal of the relay coil is connected to the first output terminal of the indoor unit main control module 210, and the main contacts of the relay are connected in series between the input terminal of the high-voltage power supply module 30 and the first external AC source 400.

[0045] In other words, a relay is used as the controllable switch 40. The relay coil is connected to the low-voltage power supply module 10 and the indoor unit main control module 210 respectively. That is, the relay coil carries a lower voltage and current. The main contacts of the relay are connected to the high-voltage power supply module 30 and the first external AC source 400. That is, the main contacts of the relay are used to carry a higher voltage and current. Thus, the relay enables the control of a high-voltage circuit through a low-voltage system, improving electrical safety. At the same time, the control coil controls the closing and opening of the main contacts, which can effectively separate the control signal from the controlled equipment, play a role in electrical isolation, and protect the circuit safety.

[0046] In one embodiment of this disclosure, the power supply circuit 100 of the indoor unit further includes: an isolated power supply module 50 disposed in the indoor unit 200, the input terminal of the isolated power supply module 50 being connected to the output terminal of the low-voltage power supply module 10, the output terminal of the isolated power supply module 50 being connected to the low-voltage power supply terminal of the fan drive module 220, the isolated power supply module 50 being configured to generate a fifth DC power supply DC-VCC5 based on the second DC power supply DC-VCC2 to provide low-voltage power to the fan drive module 220; the output terminal of the high-voltage power supply module 30 being connected to the high-voltage power supply terminal of the fan drive module 220.

[0047] Specifically, the fan drive is a high-voltage drive, using the high-voltage power supply after mains rectification, namely the fourth DC power supply DC-VCC4. The reference ground of the power supply is hot ground, which is high-voltage. However, the fan drive module 220 and the drive chip generally require 15V and 5V power. Therefore, the required low-voltage power supply needs to be drawn from the low-voltage DC power supply provided by the wired controller 300, namely the second DC power supply DC-VCC2. To improve circuit safety, the power supply is isolated from the second DC power supply DC-VCC2 through the isolation power supply module 50, thereby improving safety and reducing mutual interference between circuits. The isolation power supply module 50 can be constructed by isolating the flyback circuit and the output circuit through a transformer.

[0048] In one embodiment of this disclosure, the power supply circuit 100 of the indoor unit 200 further includes: a rectifier module 60 disposed on the wired controller 300, the input terminal of the rectifier module 60 being connected to a second external AC source 500, and the output terminal of the rectifier module 60 being connected to the input terminal of the low-voltage power supply module 10, wherein the second external AC source 500 is used to provide a second AC power AC-VCC2; the rectifier module 60 is configured to perform AC-DC conversion on the second AC power AC-VCC2 and output a first DC power DC-VCC1.

[0049] Specifically, the second external AC source 500 can draw power from the monitoring room and can be powered by a UPS (Uninterruptible Power Supply). As shown in Figure 2, the rectifier module 60 draws power from the second external AC source 500 through the AC229V input port of the wired controller 300, and converts the second AC power AC-VCC2 provided by the second external AC source 500 into AC-DC power to provide the first DC power DC-VCC6 to the low-voltage power supply module 10.

[0050] Therefore, the power supply circuit 100 of the indoor unit provides high-voltage DC power to the indoor unit's electrical control system based on the first AC power AC-VCC1 provided by the first external AC source 400, and provides low-voltage DC power to the indoor unit's electrical control system based on the second AC power AC-VCC2 provided by the second external AC source 500. This allows the wired controller 300 and the indoor unit 200 to be connected to different AC sources, preventing the wired controller 300 and the indoor unit 200 from losing power at the same time and improving electrical safety.

[0051] As a specific embodiment of this disclosure, the power supply circuit 100 of the indoor unit is shown in FIG. 2. It is used to supply power to the indoor unit electrical control system of the indoor unit 200. The indoor unit electrical control system may include the indoor unit main control module 210, an indoor 485 communication circuit, an electronic expansion valve control circuit, etc. In particular, the power supply circuit 100 of the indoor unit sets the low-voltage power supply module 10 in the wired controller 300, which provides low-voltage DC power to supply low-voltage electrical components such as the indoor unit main control module 210. High-voltage DC power is also provided through the high-voltage power supply module 30 set in the indoor unit 200. The indoor unit main control module 210 controls the opening and closing of the relay connected in series between the high-voltage power supply module 30 and the first external AC source 400 to improve power safety and control standby power consumption.

[0052] In addition, since the second external AC source 500 connected to the wired controller 300 is different from the first external AC source 400 connected to the indoor unit 200, the wired controller 300 and the indoor unit 200 are powered separately, thereby preventing the low-voltage power supply and high-voltage power supply of the indoor unit's electrical control system from being cut off at the same time, thus improving electrical safety.

[0053] In summary, the power supply circuit for the indoor unit according to the embodiments of this disclosure is applied to an air conditioner. The air conditioner also includes a wired controller. The power supply circuit for the indoor unit includes a low-voltage power supply module disposed in the wired controller. The input terminal of the low-voltage power supply module is connected to a reference power supply terminal, and the first output terminal of the low-voltage power supply module is adapted to be connected to the indoor unit main control module. The reference power supply terminal is used to provide a first DC power. The low-voltage power supply module is configured to perform voltage conversion on the first DC power and output a second DC power through the first output terminal of the low-voltage power supply module to power the indoor unit main control module. Thus, this circuit supplies power to the indoor unit main control module through the low-voltage power supply module in the wired controller. Therefore, when the power supply to the indoor unit is abnormal, the indoor unit main control module can still remain online based on the second DC power provided by the wired controller, thereby improving the operational stability of the air conditioner.

[0054] Corresponding to the above embodiments, this disclosure also proposes an air conditioner.

[0055] As shown in Figure 3, the air conditioner 1000 of this embodiment includes an indoor unit 200, a wired controller 300, and the aforementioned power supply circuit 100 for the indoor unit. The low-voltage power supply module in the power supply circuit 100 for the indoor unit is located within the wired controller 300 to draw power from the wired controller 300 to supply power to the main control module of the indoor unit 200.

[0056] As shown in Figures 2 and 4, in one embodiment of this disclosure, the wired controller 300 further includes a wired controller main control module 310. The power supply terminal of the wired controller main control module 310 is connected to the second output terminal of the low-voltage power supply module 10. The low-voltage power supply module 10 is also configured to perform voltage conversion on the first DC power DC-VCC1 and output a sixth DC power DC-VCC6 through the second output terminal of the low-voltage power supply module 10 to power the wired controller main control module 310.

[0057] In other words, in addition to providing low-voltage power to the indoor unit main control module 210, the low-voltage power supply module 10 also provides low-voltage DC power, namely the sixth DC power DC-VCC6, to the wired controller main control module 310.

[0058] In one embodiment of this disclosure, the communication terminal of the wired controller main control module 310 is connected to the first output terminal of the low-voltage power supply module 10 and the communication terminal of the indoor unit main control module 210, respectively, so as to realize communication between the wired controller main control module 310 and the indoor unit main control module 210 based on the second DC power DC-VCC2.

[0059] In other words, the main control module 310 of the wired controller and the main control module 210 of the indoor unit communicate using power line carrier communication based on the second DC power supply DC-VCC2. Power line carrier communication is a special communication method that uses power lines as the transmission medium for data transmission.

[0060] In one embodiment of this disclosure, the air conditioner 1000 further includes an outdoor unit 600, which includes an outdoor unit main control module 610. The second communication terminal of the indoor unit main control module 210 is connected to the communication terminal of the outdoor unit main control module 610.

[0061] Specifically, the indoor unit main control module 210 can communicate with the outdoor unit main control module 610 through the indoor 485 chip communication module. On the one hand, the indoor unit main control module 210 can send control signals and indoor unit detection signals sent by the wired controller 300 to the outdoor unit main control module 610. On the other hand, the indoor unit main control module 210 receives the control commands sent by the outdoor unit main control module 610 and executes control actions based on the received control commands.

[0062] In one embodiment of this disclosure, the indoor unit 200 further includes an electronic expansion valve drive module 240 and an electronic expansion valve 230. The input terminal of the electronic expansion valve drive module 240 is connected to the second output terminal of the indoor unit main control module 210, and the output terminal of the electronic expansion valve drive module 240 is connected to the electronic expansion valve 230.

[0063] In other words, the indoor unit main control module 210 controls the opening degree of the electronic expansion valve 230 through the electronic expansion valve drive module 240 to control the refrigerant flow in the indoor unit 200.

[0064] In one embodiment of this disclosure, the indoor unit main control module 210 is further configured to: acquire the operating parameters of the fan drive module 220; determine the current operating mode of the air conditioner 1000 if the fan drive module 220 is in an abnormal operating state based on the operating parameters; and control the electronic expansion valve 230 based on the current operating mode.

[0065] Specifically, the fan drive module 220 is used to drive the fan motor of the indoor unit 200. It needs to be isolated from the indoor unit main control module 210 in terms of power supply and communication signals. At the same time, the motor drive module 220 can also have voltage monitoring function.

[0066] During operation, the indoor unit main control module 210 acquires the operating parameters of the fan drive module 220, such as the high-voltage supply voltage, output voltage, output current, and temperature of the fan drive module 220. These operating parameters can be acquired through a separately arranged detection circuit or based on the self-test function of the fan drive module 220 itself. Then, the operating status of the fan drive module 220 is judged based on the acquired operating parameters. For example, if the operating parameters are within the preset range, the fan drive module 220 is determined to be in normal operating condition; otherwise, it is considered to be in abnormal operating condition. When the fan drive module 220 is determined to be in an abnormal operating condition, it is considered that the fan motor may stop. Therefore, the opening degree of the electronic expansion valve 230 needs to be controlled according to the current operating mode of the air conditioner 1000 to prevent the compressor from continuing to run in the event of an abnormal fan motor stoppage, which could lead to indoor unit icing or refrigerant backflow, thus improving the operational safety of the air conditioner.

[0067] In one embodiment of this disclosure, the operating parameters include the input voltage of the high-voltage power supply terminal of the fan drive module 220, and the indoor unit main control module 210 is further configured to determine that the fan drive module 220 is in an abnormal operating state when the input voltage is zero.

[0068] In other words, after the indoor unit main control module 210 is powered on, the control relay closes, the first external AC source 400 supplies power to the indoor unit, the indoor unit main control module 220 acquires the input voltage of the high voltage power supply terminal of the fan drive module 220 in real time, and judges the working status of the fan drive module 220 based on the high voltage input voltage of the fan drive module 220. That is, when the high voltage input voltage of the fan drive module 220 is 0, it is considered that the fan drive module 220 has a high voltage power supply abnormality and is in an abnormal working state.

[0069] It is understandable that when the input voltage at the high-voltage power supply terminal of the fan drive module 220 is zero, it may be due to a fault in the fan drive module 220 itself, or it may be due to a fault in the high-voltage power supply branch, such as the high-voltage power supply module 30 or the first external AC source 400. Based on the circuit connection of the power supply circuit 100, a power failure in the high-voltage power supply branch will not affect the low-voltage power supply. The indoor unit main control module 210 remains powered on and can continue to control the opening of the electronic expansion valve 230.

[0070] In one embodiment of this disclosure, the indoor unit main control module 210 is further configured to determine a target opening degree based on the current operating mode and control the electronic expansion valve 230 according to the target opening degree.

[0071] Specifically, a correspondence table between the working mode and the opening degree of the electronic expansion valve 230 can be preset. During the working process, the target opening degree is obtained by looking up the table based on the determined working mode, thereby controlling the electronic expansion valve 230.

[0072] In one embodiment of this disclosure, the indoor unit main control module 210 is further configured to determine the target opening degree as a first opening degree value when the current working mode is heating mode; and to determine the target opening degree as zero when the current working mode is non-heating mode, wherein the first opening degree value is greater than zero.

[0073] In other words, in heating mode, the electronic expansion valve is opened to its first opening value to allow refrigerant to flow back into the indoor unit. In cooling mode, the electronic expansion valve remains closed to prevent the indoor unit from icing up due to continuous refrigerant circulation.

[0074] As a specific embodiment of this application, the connection of the air conditioner 1000 is shown in Figures 2 and 4. The second external AC source is the mains power grid. The control method of the indoor unit main control module 210 is shown in Figure 5, which may include the following process:

[0075] S101, low voltage power-on, indoor unit main control module and wired controller start.

[0076] S102, determine whether communication with the wind turbine drive module is normal. If yes, proceed to step S103; otherwise, proceed to step S105.

[0077] S103, the indoor unit's main control module controls the relay to close, and the indoor mains power is supplied.

[0078] S104. Determine whether the fan drive detection voltage (i.e., the input voltage at the high-voltage input terminal of the fan drive module) is zero. If yes, proceed to step S105; otherwise, proceed to step S108.

[0079] S105 indicates a fault in the fan drive module.

[0080] S106, Indoor unit control is not turned on.

[0081] S107, send the first fault information to the wired controller.

[0082] S108, determine whether the communication between the indoor unit main control module and the outdoor unit main control module is normal. If yes, proceed to step S109; if no, proceed to step S124.

[0083] S109 indicates that the indoor unit's self-test is normal.

[0084] S110 controls the normal operation of the indoor unit's electrical control system (indoor unit startup).

[0085] S111: Based on the control command received from the outdoor unit's main control module, the electronic expansion valve is opened and the fan motor is started. During operation, step S112 continues to be executed.

[0086] S112, determine whether indoor and outdoor communication is normal. If yes, proceed to step S113; if no, proceed to step S120.

[0087] S113, determine whether the fan drive detection voltage (i.e., the input voltage at the high-voltage input terminal of the fan drive module) is zero. If yes, proceed to step S114; otherwise, proceed to step S109.

[0088] S114, confirming that the fan motor has stopped.

[0089] S115, the indoor unit's main control module adjusts the opening of the electronic expansion valve according to the operating mode. For example, cooling is turned off, heating is reduced and maintained at a certain opening.

[0090] S116, the indoor unit main control module informs the outdoor unit main control module of the current status through indoor-outdoor communication, so that the outdoor unit main control module can adjust the energy output according to actual needs. For example, it can control the compressor.

[0091] S117 controls the relay to remain closed.

[0092] S118, determine whether the fan drive detection voltage (i.e., the input voltage at the high-voltage input terminal of the fan drive module) is zero. If yes, proceed to step S119; otherwise, proceed to step S109.

[0093] S119 controls the relay to remain closed.

[0094] S120: The indoor unit's main control module adjusts the opening of the electronic expansion valve according to the air conditioner's operating mode. For example, cooling is turned off, while heating is reduced and maintained at a certain opening.

[0095] S121, send the second fault information to the wired controller.

[0096] S122, determine whether indoor and outdoor communication has been restored. If yes, proceed to step S123; if no, proceed to step S109.

[0097] S123 controls the indoor unit load to stop running.

[0098] S124, Confirming that the indoor unit cannot communicate with the outdoor unit, do not turn it on. Proceed to step S107.

[0099] According to the air conditioner of the present disclosure embodiment, based on the power supply circuit of the indoor unit described above, the main control module of the indoor unit is powered through the low-voltage power supply module in the wired controller, so that when the power supply of the indoor unit is abnormal, the main control module of the indoor unit can still remain online based on the second DC power provided by the wired controller, thereby improving the operational stability of the air conditioner.

[0100] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0101] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A power supply circuit of an indoor unit, characterized by, Applied to an air conditioner, the air conditioner also includes a wired controller, the circuit comprising: A low-voltage power supply module is provided in the wired controller. The input terminal of the low-voltage power supply module is connected to a reference power supply terminal, and the first output terminal of the low-voltage power supply module is adapted to be connected to the indoor unit main control module. The reference power supply terminal is used to provide a first DC power. The low-voltage power supply module is configured to perform voltage conversion on the first DC power and output a second DC power through the first output terminal of the low-voltage power supply module to power the indoor unit main control module.

2. The circuit of claim 1, wherein, The circuit also includes: A DC-DC converter module is installed in the indoor unit. The input terminal of the DC-DC converter module is connected to the output terminal of the low-voltage power supply module, and the output terminal of the DC-DC converter module is connected to the power supply terminal of the indoor unit main control module. The DC-DC converter module is configured to convert the second DC power and output a third DC power.

3. The circuit of claim 2 or 1, characterized in that, The circuit also includes: The high-voltage power supply module of the indoor unit is provided with an input terminal connected to a first external AC source and an output terminal connected to the high-voltage power supply terminal of the fan drive module. The first external AC source is used to provide first AC power. The high-voltage power supply module is configured to convert the first AC power to DC power and output a fourth DC power to provide high-voltage power to the fan drive module, wherein the fourth DC power is greater than the second DC power.

4. The circuit of claim 3, wherein, The circuit also includes: A controllable switch is provided in the indoor unit. The controllable switch is connected in series between the input terminal of the high-voltage power supply module and the first external AC source. The control terminal of the controllable switch is connected to the first output terminal of the indoor unit main control module.

5. The circuit of claim 4, wherein, The controllable switch is a relay. The power supply terminal of the relay coil is connected to the output terminal of the low-voltage power supply module, the control terminal of the relay coil is connected to the first output terminal of the indoor unit main control module, and the main contacts of the relay are connected in series between the input terminal of the high-voltage power supply module and the first external AC source.

6. The circuit of any one of claims 1-3, wherein, The circuit also includes: An isolated power supply module is provided in the indoor unit. The input terminal of the isolated power supply module is connected to the output terminal of the low-voltage power supply module, and the output terminal of the isolated power supply module is connected to the low-voltage power supply terminal of the fan drive module. The isolated power supply module is configured to generate a fifth DC power based on the second DC power to provide low-voltage power to the fan drive module. The output terminal of the high-voltage power supply module is connected to the high-voltage power supply terminal of the fan drive module.

7. The circuit of claim 1, wherein, The circuit also includes: A rectifier module is provided in the wired controller. The input terminal of the rectifier module is connected to a second external AC source, and the output terminal of the rectifier module is connected to the input terminal of the low-voltage power supply module. The second external AC source is used to provide a second AC power. The rectifier module is configured to convert the second AC power to DC power and output the first DC power.

8. An air conditioner characterized by comprising: It includes an indoor unit, a wired controller, and a power supply circuit for the indoor unit according to any one of claims 1-7.

9. The air conditioner of claim 8, wherein The wired controller also includes: The main control module of the wired controller is connected to the second output terminal of the low-voltage power supply module. The low-voltage power supply module is also configured to convert the first DC power and output a sixth DC power through the second output terminal of the low-voltage power supply module to power the main control module of the wired controller.

10. The air conditioner of claim 9, wherein The communication terminal of the wired controller main control module is connected to the first output terminal of the low-voltage power supply module and the communication terminal of the indoor unit main control module, respectively, so as to realize the communication between the wired controller main control module and the indoor unit main control module based on the second DC power.

11. The air conditioner of claim 8, wherein The air conditioner also includes an outdoor unit, which includes an outdoor unit main control module. The second communication terminal of the indoor unit main control module is connected to the communication terminal of the outdoor unit main control module.

12. The air conditioner of claim 11, wherein The indoor unit also includes: An electronic expansion valve drive module and an electronic expansion valve are provided. The input terminal of the electronic expansion valve drive module is connected to the second output terminal of the indoor unit main control module, and the output terminal of the electronic expansion valve drive module is connected to the electronic expansion valve.

13. The air conditioner according to any one of claims 8 to 12, wherein The indoor unit also includes a fan drive module, and the indoor unit main control module is further configured to... Obtain the operating parameters of the wind turbine drive module; If the fan drive module is determined to be in an abnormal working state based on the operating parameters, the current working mode of the air conditioner is determined. The electronic expansion valve is controlled based on the current operating mode.

14. The air conditioner of any one of claim 13, wherein The operating parameters include the input voltage of the high-voltage power supply terminal of the fan drive module, and the indoor unit main control module is further configured to... When the input voltage is zero, it is determined that the fan drive module is in an abnormal working state.

15. The air conditioner of any one of claims 8-13, wherein, The indoor unit main control module is also configured to... Determine the target opening degree based on the current working mode; The electronic expansion valve is controlled according to the target opening degree.

16. The air conditioner of claim 15, wherein The indoor unit main control module is also configured to... When the current working mode is heating mode, the target opening degree is determined to be the first opening degree value; When the current operating mode is non-heating mode, the target opening degree is determined to be zero, wherein the first opening degree value is greater than zero.

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