Air conditioner

Abstract

The utility model discloses an air conditioner. The air conditioner comprises first equipment and second equipment, the first device comprises a one-way pre-charging circuit and a first current loop circuit, the one-way pre-charging circuit is connected with the communication line and the live line, the first current loop circuit is connected with the communication line and the zero line, and the pre-charging direction of the one-way pre-charging circuit corresponds to the communication direction of the first current loop circuit; the second equipment comprises a power supply switch and a second power supply circuit, the second power supply circuit is respectively connected with the power supply switch and the zero line and is used for supplying power to the second equipment, and under the condition that the power supply switch is connected with the communication line, the external power supply pre-charges the second power supply circuit through the live wire, the one-way pre-charging circuit, the communication line and the zero line. Therefore, according to the air conditioner, based on the corresponding arrangement of the pre-charging direction of the one-way pre-charging circuit and the communication direction of the first current loop circuit, the first current loop circuit does not bear high-voltage electricity provided by the external power source in the awakening stage, and safe awakening is achieved.

Description

Technical Field

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

[0002] In the related art, the outdoor unit is woken up by reusing a communication line. However, during the wake-up stage, when the outdoor unit is charged through the communication line and the pre-charge circuit, the communication line is connected to the live wire through the PTC (Positive Temperature Coefficient) in the pre-charge circuit, and a high voltage is generated between the communication line and the live wire, resulting in a very high voltage on the communication optocoupler on the indoor / outdoor side, far exceeding the withstand voltage value of the optocoupler, and there is a risk of use. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the purpose of the utility model is to provide an air conditioner. Based on the corresponding setting of the pre-charge direction of the unidirectional pre-charge circuit and the communication direction of the first current loop circuit, the first current loop circuit can be made not to bear the high voltage provided by the external power supply during the wake-up stage, realizing safe wake-up.

[0004] To achieve the above object, the utility model provides an air conditioner, including: a first device and a second device, one of the first device and the second device is an indoor unit, and the other is an outdoor unit; the first device includes a unidirectional pre-charge circuit and a first current loop circuit, the unidirectional pre-charge circuit is respectively connected to the communication line and the live wire, the first current loop circuit is respectively connected to the communication line and the neutral wire, and the pre-charge direction of the unidirectional pre-charge circuit corresponds to the communication direction of the first current loop circuit; the second device includes a power supply switch and a second power supply circuit, the power supply switch selectively connects the communication line or the live wire, and the second power supply circuit is respectively connected to the power supply switch and the neutral wire for supplying power to the second device. Wherein, when the power supply switch is connected to the communication line, the external power supply pre-charges the second power supply circuit through the live wire, the unidirectional pre-charge circuit, the communication line and the neutral wire.

[0005] According to the air conditioner of the present utility model, one of the first device and the second device is an indoor unit, and the other is an outdoor unit. The first device includes a unidirectional pre-charge circuit and a first current loop circuit. The unidirectional pre-charge circuit is respectively connected to the communication line and the live wire, and the first current loop circuit is respectively connected to the communication line and the neutral wire. The pre-charge direction of the unidirectional pre-charge circuit corresponds to the communication direction of the first current loop circuit. The second device includes a power supply switch and a second power supply circuit. The power supply switch selectively connects the communication line or the live wire, and the second power supply circuit is respectively connected to the power supply switch and the neutral wire. The second device is used to supply power to the second device. Wherein, when the power supply switch is connected to the communication line, the external power supply pre-charges the second power supply circuit through the live wire, the unidirectional pre-charge circuit, the communication line and the neutral wire. Thus, based on the corresponding setting of the pre-charge direction of the unidirectional pre-charge circuit and the communication direction of the first current loop circuit, the air conditioner can prevent the first current loop circuit from bearing the high voltage provided by the external power supply during the wake-up stage and achieve safe wake-up.

[0006] In addition, the air conditioner according to the above embodiment of the present utility model may further have the following additional technical features:

[0007] Specifically, the first current loop circuit includes: a first diode and a first transceiver circuit. The anode of the first diode is connected to the communication line, one end of the first transceiver circuit is connected to the cathode of the first diode, and the other end of the first transceiver circuit is connected to the neutral wire; or, the cathode of the first diode is connected to the communication line, one end of the first transceiver circuit is connected to the anode of the first diode, and the other end of the first transceiver circuit is connected to the neutral wire.

[0008] Specifically, the first current loop circuit further includes: a first current-limiting resistor, and the first current-limiting resistor is connected in series between the first diode and one end of the first transceiver circuit.

[0009] Specifically, the first current-limiting resistor is a thermistor.

[0010] Specifically, the first current loop circuit further includes: a first voltage-regulating diode. The cathode of the first voltage-regulating diode is respectively connected to the cathode of the first diode and one end of the first transceiver circuit, and the anode of the first voltage-regulating diode is respectively connected to the other end of the first transceiver circuit and the neutral wire; or, the anode of the first voltage-regulating diode is respectively connected to the anode of the first diode and one end of the first transceiver circuit, and the cathode of the first voltage-regulating diode is respectively connected to the other end of the first transceiver circuit and the neutral wire.

[0011] Specifically, the unidirectional pre-charge circuit includes: a pre-charge diode, a pre-charge resistor, and a pre-charge switch connected in series between the communication line and the live wire, and the anode of the pre-charge diode is respectively connected to the communication line and the anode of the first diode; alternatively, the cathode of the pre-charge diode is respectively connected to the communication line and the cathode of the first diode; wherein, when the power supply switch connects the communication line and the pre-charge switch is closed, the external power supply pre-charges the second power supply circuit through the live wire, the unidirectional pre-charge circuit, the communication line, and the neutral wire.

[0012] Specifically, the second device further includes: a second current loop circuit, the second current loop circuit is respectively connected to the communication line and the neutral wire, and the communication direction of the second current loop circuit is the same as that of the first current loop circuit. Wherein, when the power supply switch connects the live wire, the external power supply supplies power to the second power supply circuit through the live wire and the neutral wire, and the second device establishes a current loop path with the first device through the second current loop circuit, the communication line, the neutral wire, and the first current loop circuit.

[0013] Specifically, the second current loop circuit includes: a second diode, a second current limiting resistor, a second voltage stabilizing diode, and a second transceiver circuit. The cathode of the second diode is connected to the communication line, the anode of the second diode is connected to one end of the second current limiting resistor, the other end of the second current limiting resistor is respectively connected to the anode of the second voltage stabilizing diode and one end of the second transceiver circuit, and the cathode of the second voltage stabilizing diode is respectively connected to the other end of the second transceiver circuit and the neutral wire; alternatively, the anode of the second diode is connected to the communication line, the cathode of the second diode is connected to one end of the second current limiting resistor, the other end of the second current limiting resistor is respectively connected to the cathode of the second voltage stabilizing diode and one end of the second transceiver circuit, and the anode of the second voltage stabilizing diode is respectively connected to the other end of the second transceiver circuit and the neutral wire.

[0014] Specifically, the first end of the power supply switch is connected to the first input end of the second power supply circuit, the second end of the power supply switch is connected to the live wire, the third end of the power supply switch is connected to the communication line, and the second input end of the second power supply circuit is connected to the neutral wire; wherein, when the first end and the third end of the power supply switch are connected, the power supply switch connects the communication line; when the first end and the second end of the power supply switch are connected, the power supply switch connects the live wire.

[0015] Specifically, the first device or the second device further includes: a communication power supply circuit, the communication power supply circuit is respectively connected to the live wire and the neutral wire, and is used to supply power to the current loop path.

[0016] Specifically, when the first device includes a communication power supply circuit, the communication power supply circuit includes: a first capacitor, a third voltage regulator diode, a first resistor, a second resistor, and a third diode. One end of the first capacitor is connected to the other end of the first transceiver circuit, and the other end of the first capacitor is connected to the neutral line. The anode of the third voltage regulator diode is connected to one end of the first capacitor, and the cathode of the third voltage regulator diode is connected to the other end of the first capacitor. The first resistor is connected in parallel with the first capacitor. One end of the second resistor is connected to one end of the first capacitor, and the other end of the second resistor is connected to the anode of the third diode. The cathode of the third diode is connected to the live wire.

[0017] Specifically, the first device further includes: a first power supply circuit, which is respectively connected to the live wire and the neutral line and is used to supply power to the first device.

[0018] Specifically, the first device further includes a first control circuit. The first transceiver circuit includes: a first receiving optocoupler, a first transmitting optocoupler, and a first transmitting switch. The first end of the first receiving optocoupler serves as one end of the first transceiver circuit. The second end of the first receiving optocoupler is connected to the third end of the first transmitting optocoupler. The third end of the first receiving optocoupler is connected to a first preset power supply. The fourth end of the first receiving optocoupler is connected to the first control circuit. The first end of the first transmitting optocoupler is connected to the first preset power supply. The second end of the first transmitting optocoupler is connected to the first control circuit through the first transmitting switch. The fourth end of the first transmitting optocoupler serves as the other end of the first transceiver circuit.

[0019] Specifically, the second device further includes a second control circuit. The second transceiver circuit includes: a second receiving optocoupler, a second transmitting optocoupler, and a second transmitting switch. The first end of the second receiving optocoupler serves as the other end of the second transceiver circuit. The second end of the second receiving optocoupler is connected to the third end of the second transmitting optocoupler. The third end of the second receiving optocoupler is connected to a second preset power supply. The fourth end of the second receiving optocoupler is connected to the second control circuit. The first end of the second transmitting optocoupler is connected to the second preset power supply. The second end of the second transmitting optocoupler is connected to the second control circuit through the second transmitting switch. The fourth end of the second transmitting optocoupler serves as one end of the second transceiver circuit.

[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic connection diagram of an air conditioner according to an embodiment of the present utility model;

[0022] Figure 2 Circuit diagram of an air conditioner according to a specific embodiment of the present utility model;

[0023] Figure 3Circuit diagram of an air conditioner according to another specific embodiment of the present utility model;

[0024] Figure 4 is Figure 2 Schematic diagram of current flow direction;

[0025] Figure 5 Working timing diagram according to a specific embodiment of the present invention;

[0026] Figure 6 Working flowchart of an air conditioner according to a specific embodiment of the present invention. Specific embodiments

[0027] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, but should not be construed as limiting the present utility model.

[0028] The air conditioner proposed by the present utility model will be described below with reference to the drawings.

[0029] In the electric control architecture without large current indoors, the outdoor unit is woken up by multiplexing the pre-charge circuit. However, during the wake-up stage, the S line (communication line) is connected to the L line (live wire) through the PTC. If the TXD optocoupler (receiving optocoupler) on the indoor / outdoor side is controlled to be in the conducting state, or the TXD optocoupler is protected from overvoltage by connecting a zener diode in parallel, the high voltage between the S line and the N line will be released into the resistance of the current loop path. And, during the wake-up stage, the communication loops on the indoor side and the outdoor side are in a parallel relationship. Considering heat generation, the impedance of the current loop path needs to be designed very large.

[0030] Generally, the communication voltage of the current loop is only a few tens of volts. During the normal communication stage, the communication loops on the indoor side and the outdoor side are in a series relationship. To ensure the stability of current loop communication, the loop current cannot be too small, that is, the loop impedance cannot be designed too large, so as to avoid insufficient loop current.

[0031] Based on the above analysis, there are conflicting requirements for the value of the communication loop resistance between the wake-up stage and the communication stage.

[0032] To solve the above technical problems, the present application proposes an air conditioner that wakes up the outdoor unit by multiplexing the communication line of the half-wave rectification method through a unidirectional pre-charge circuit, which can be used to balance the requirements for the loop resistance size between the wake-up stage and the communication stage. At the same time, the pre-charge direction of the unidirectional pre-charge circuit is set corresponding to the communication direction of the first current loop circuit, so that during the wake-up stage, the first current loop circuit of the indoor unit will not bear the high voltage provided by the external power supply, so as to achieve safe wake-up.

[0033] Figure 1 Schematic connection diagram of an air conditioner according to an embodiment of the present utility model.

[0034] As Figure 1 shown, the air conditioner 1000 of the present utility model may include: a first device 10 and a second device 20.

[0035] Wherein, one of the first device 10 and the second device 20 is an indoor unit, and the other is an outdoor unit. The first device 10 includes a one-way pre-charge circuit 11 and a first current loop circuit 12. The one-way pre-charge circuit 11 is respectively connected to the communication line S and the live wire L, and the first current loop circuit 12 is respectively connected to the communication line S and the neutral wire N. The pre-charge direction of the one-way pre-charge circuit 11 corresponds to the communication direction of the first current loop circuit 12. The second device 20 includes a power supply switch K2 and a second power supply circuit 21. The power supply switch K2 selectively connects the communication line S or the live wire L. The second power supply circuit 21 is respectively connected to the power supply switch K2 and the neutral wire N and is used to supply power to the second device 20. Wherein, when the power supply switch K2 is connected to the communication line S, the external power supply pre-charges the second power supply circuit 21 through the live wire L, the one-way pre-charge circuit 11, the communication line S and the neutral wire N.

[0036] Specifically, one of the first device 10 and the second device 20 is an indoor unit, and the other is an outdoor unit. For example, the first device 10 is an indoor unit and the second device 20 is an outdoor unit; or the first device 10 is an outdoor unit and the second device 20 is an outdoor unit, which is not specifically limited.

[0037] The one-way pre-charge circuit 11 is used to provide a one-way conduction circuit between the live wire L and the communication line S during the wake-up stage to multiplex the communication line S, so as to provide a pre-charge branch with a large impedance for the second power supply circuit 21 and perform the pre-charge action on the second power supply circuit 21. It can be understood that a large resistor is connected in series in the one-way pre-charge circuit 11 to avoid excessive current when the second power supply circuit 21 is powered on, which may damage the second power supply circuit 21.

[0038] Meanwhile, the pre-charging direction of the unidirectional pre-charging circuit 11 corresponds to the communication direction of the first current loop circuit 12, and a series connection path cannot be formed between the unidirectional pre-charging circuit 11 and the first current loop circuit 12. Herein, the pre-charging direction of the unidirectional pre-charging circuit 11 refers to the current direction allowed to pass through the unidirectional pre-charging circuit 11, and the communication direction of the first current loop circuit 12 is the current direction allowed to pass through the first current loop circuit 12 in real time. For example, if the pre-charging direction of the unidirectional pre-charging circuit 11 is counterclockwise, then the communication direction of the first current loop circuit 12 is also counterclockwise; if the pre-charging direction of the unidirectional pre-charging circuit 11 is clockwise, then the communication direction of the first current loop circuit 12 is also clockwise. Thus, during the wake-up phase, i.e., the pre-charging phase of the second power supply circuit 21, when the unidirectional pre-charging circuit 11 is turned on, since a series connection path cannot be formed between the unidirectional pre-charging circuit 11 and the first current loop circuit 12, the high-voltage power supplied by the external power supply will not be applied to the first current loop circuit 12, improving the wake-up safety. Herein, the on / off control of the unidirectional pre-charging circuit 11 can be performed by the controller of the first device 10.

[0039] The power supply switch K2 can be, as Figure 1 shown, a single-pole double-throw switch to complete the connection between the second power supply circuit 21 and the live wire L or the communication wire S. Two interlocking switches can also be used to control one end of the second power supply circuit 21 to selectively connect to the live wire L or the communication wire S. For example, in the Figure 1 embodiment shown, the two interlocking switches can be respectively connected in series between the second power supply circuit 21 and the communication wire S, and between the second power supply circuit 21 and the live wire L, and the input end of the second power supply circuit 21 is controlled to connect to the communication wire S or the live wire L by controlling the two interlocking switches. Herein, the power supply switch K2 can be controlled by the controller of the second device 20. For example, the initial state of the power supply switch K2 is set to connect to the communication wire S, the second device 20 is powered on at the start of pre-charging, and at the end of pre-charging, the second device 20 controls the power supply switch K2 to connect to the live wire L, thereby completing the switching of the power supply circuit.

[0040] The external power supply is used to provide alternating current. The external power supply can be connected to the first device 10 to supply power to the power line through the first device 10, or can be connected to the second device 20 to supply power to the power line through the second device 20, and there is no specific limitation.

[0041] During the wake-up phase, the unidirectional pre-charge circuit 11 is turned on, and the power supply switch K2 is connected to the communication line S. The external power supply supplies power to the second power supply circuit 21 through the live wire L, the unidirectional pre-charge circuit 11, the communication line S, and the neutral wire N, thereby pre-charging the second power supply circuit 21. Since the pre-charge direction of the unidirectional pre-charge circuit 11 corresponds to the communication direction of the first current loop circuit 12, during the pre-charge process, the high-voltage electricity provided by the external power supply will not flow into the first current loop circuit 12, so that the first current loop circuit 12 in the first device 10 will not bear high voltage during the wake-up phase, ensuring the safety of the components of the first current loop circuit 12 during the wake-up phase and realizing safe wake-up.

[0042] When successfully waking up and entering the normal communication phase, the unidirectional pre-charge circuit 11 is disconnected, and the power supply switch K2 is connected to the live wire L. At this time, the external power supply directly supplies power to the second power supply circuit 21 through the power line, so that the high-voltage electricity provided by the external power supply will not flow into the first current loop circuit 12 either, ensuring the safety of the components of the first current loop circuit 12 during normal communication.

[0043] Among them, the second power supply circuit 21 is used to rectify, filter and other operations on the received electrical signal to output a target electrical signal to supply power to the second device 20. The second power supply circuit 21 also includes an energy storage capacitor E2 (as Figure 2 and Figure 3 shown). When pre-charging the second power supply circuit 21, the second power supply circuit 21 rectifies the received electrical signal through its rectification circuit to output a target direct current. The target direct current charges the energy storage capacitor E2 on the one hand and supplies power to the second device 20 on the other hand, so that the second device 20 is powered on.

[0044] Based on the corresponding setting of the pre-charge direction of the unidirectional pre-charge circuit 11 and the communication direction of the first current loop circuit 12 in this embodiment, during the wake-up phase, the first current loop circuit 12 will not bear the high-voltage electricity provided by the external power supply, realizing safe wake-up. At the same time, the half-wave rectification method is adopted to balance the requirements for the loop resistance size in the pre-charge (i.e., wake-up phase) and communication phases, ensuring both safe wake-up and reliable communication.

[0045] Combined with Figure 2 and Figure 3 shown, in an embodiment of the present invention, the first current loop circuit 12 includes: a first diode D1 and a first transceiver circuit 121. The anode of the first diode D1 is connected to the communication line S, one end of the first transceiver circuit 121 is connected to the cathode of the first diode D1, and the other end of the first transceiver circuit 121 is connected to the neutral wire N; or, the cathode of the first diode D1 is connected to the communication line S, one end of the first transceiver circuit 121 is connected to the anode of the first diode D1, and the other end of the first transceiver circuit 121 is connected to the neutral wire N.

[0046] That is to say, in this embodiment, the communication direction of the first current loop circuit 12 is restricted by the first diode D1. For example, in Figure 2 the shown embodiment, the communication direction of the first current loop circuit 12, i.e., the current direction, is counterclockwise; in Figure 3 the shown embodiment, the communication direction of the first current loop circuit 12, i.e., the current direction, is clockwise.

[0047] Since the pre-charging direction of the unidirectional pre-charging circuit 11 corresponds to the communication direction of the first current loop circuit 12, therefore, in Figure 2 the shown embodiment, the pre-charging direction of the unidirectional pre-charging circuit 11 is also counterclockwise, and in Figure 3 the shown embodiment, the pre-charging direction of the unidirectional pre-charging circuit 11 is also clockwise. During the wake-up stage, the first current loop circuit 12 can be short-circuited through the conducting unidirectional pre-charging circuit 11 to prevent the high-voltage electricity provided by the external power supply from causing high-voltage damage to the first current loop circuit 12.

[0048] In an embodiment of the present invention, the first current loop circuit 12 further includes: a first current-limiting resistor R121, and the first current-limiting resistor R121 is connected in series between the first diode D1 and one end of the first transceiver circuit 121.

[0049] In an embodiment of the present invention, the first current-limiting resistor R121 is a thermistor.

[0050] Specifically, the resistance value of the first current-limiting circuit R121 can be selected based on the actual situation to ensure the loop resistance requirement during the normal communication stage. For example, the first current-limiting circuit R121 can select a low-resistance positive temperature coefficient thermistor. This embodiment can suppress surge interference through the first current resistor R12 and can also play a protective role under abnormal conditions such as incorrect wiring.

[0051] In an embodiment of the present invention, the first current loop circuit 12 further includes: a first voltage-regulating diode ZV1. The cathode of the first voltage-regulating diode ZV1 is respectively connected to the cathode of the first diode D1 and one end of the first transceiver circuit 121, and the anode of the first voltage-regulating diode ZV1 is respectively connected to the other end of the first transceiver circuit 121 and the neutral line N; or, the anode of the first voltage-regulating diode ZV1 is respectively connected to the anode of the first diode D1 and one end of the first transceiver circuit 121, and the cathode of the first voltage-regulating diode ZV1 is respectively connected to the other end of the first transceiver circuit 121 and the neutral line N.

[0052] That is to say, this embodiment can achieve voltage regulation through the first voltage-regulating diode ZV1 to ensure that the devices (such as the transmitting optocoupler and receiving optocoupler) in the first current loop circuit 12 are not damaged by the surge voltage. Among them, the connection of the first voltage-regulating diode ZV1 corresponds to the communication direction of the first current loop circuit 12. Specifically, reference can be made to Figure 2 、Figure 3 as shown

[0053] In an embodiment of the present utility model, the unidirectional pre-charge circuit 11 includes: a pre-charge diode D, a pre-charge resistor R, and a pre-charge switch K1 connected in series between the communication line S and the live wire L, and the anode of the pre-charge diode D is respectively connected to the communication line S and the anode of the first diode D1; alternatively, the cathode of the pre-charge diode D is respectively connected to the communication line S and the cathode of the first diode D1; wherein, when the power supply switch K2 is connected to the communication line S and the pre-charge switch K1 is closed, the external power supply pre-charges the second power supply circuit 21 through the live wire L, the unidirectional pre-charge circuit 11, the communication line S, and the neutral wire N.

[0054] That is to say, the unidirectional pre-charge circuit 11 utilizes the unidirectional conductivity of the pre-charge diode D to limit the pre-charge direction to achieve half-wave rectification output. Among them, the pre-charge resistor R is used as a current-limiting resistor to limit the magnitude of the starting current, and a PTC resistor can be used. The pre-charge switch K1 connects the power supply line L and the communication line S, and can be turned on and off based on the control instruction of the indoor controller to achieve the on and off of the power supply line L and the communication line S. The pre-charge switch K1 is a normally open switch unit, which can be a conventional switch such as a relay, or can be realized by a thyristor device through soft start, and is not specifically limited.

[0055] Specifically, in the Figure 2 shown embodiment, the unidirectional pre-charge circuit 11 only allows current to flow from the communication line S to the live wire L, that is, only allows the alternating current of the negative half-cycle provided by the external power supply to pass through, and pre-charges the second power supply circuit 21 based on the alternating current of the negative half-cycle, and the current flow direction is as Figure 4 shown; in the Figure 3 shown embodiment, the unidirectional pre-charge circuit 11 only allows current to flow from the live wire L to the communication line S, that is, only allows the alternating current of the positive half-cycle provided by the external power supply to pass through, and pre-charges the second power supply circuit 21 based on the alternating current of the positive half-cycle.

[0056] In addition, the direction of the pre-charge diode D is determined according to the direction of the first diode D1. If the anode of the first diode D1 points to the communication line S, as Figure 2 shown, then the anode of the pre-charge diode D also points to the communication line S; if the cathode of the first diode D1 points to the communication line S, as Figure 3 shown, then the cathode of the pre-charge diode D also points to the communication line S. The purpose is that the first diode D1 and the pre-charge diode D cannot form a series connection path. In this way, when half-wave rectification multiplexing pre-charge is performed through the pre-charge diode D, the first transceiver circuit 121 will not bear the high voltage provided by the external power supply.

[0057] Thus, the unidirectional pre-charging circuit 11 utilizes the unidirectional conductivity of the pre-charging diode D to allow half-cycle alternating current to pass through when the input is a standard sine wave, so as to pre-charge the second power supply circuit 21. The alternating current in the other half-cycle is lost. At the same time, it is arranged corresponding to the direction of the first diode D1 so that the first transceiver circuit 121 does not bear the high voltage provided by the external power supply during the wake-up phase.

[0058] In an embodiment of the present invention, the second device 20 further includes: a second current loop circuit 22. The second current loop circuit 22 is respectively connected to the communication line S and the neutral line N. The communication direction of the second current loop circuit 22 is the same as that of the first current loop circuit 12. Wherein, when the power supply switch K2 is connected to the live wire L, the external power supply supplies power to the second power supply circuit 21 through the live wire L and the neutral line N. The second device 20 establishes a current loop path with the first device 10 through the second current loop circuit 22, the communication line S, the neutral line N and the first current loop circuit 12.

[0059] That is to say, after the pre-charging is completed, control the power supply switch K2 to connect to the live wire L, disconnect the unidirectional pre-charging circuit 11, and connect the second current loop circuit 22 and the first current loop circuit 12 through the communication line S and the neutral line N to establish a current loop path between the second device end 20 and the first device end 10 to realize normal communication. Wherein, the communication direction of the second current loop circuit 22 is the same as that of the first current loop circuit 12. For example, the communication directions of both the second current loop circuit 22 and the first current loop circuit 12 are clockwise, or the communication directions of both the second current loop circuit 22 and the first current loop circuit 12 are counterclockwise to ensure the normal progress of current loop communication.

[0060] In an embodiment of the present invention, the second current loop circuit 22 includes: a second diode D2, a second current limiting resistor R221, a second voltage stabilizing diode ZV2 and a second transceiver circuit 221. The cathode of the second diode D2 is connected to the communication line S, the anode of the second diode D2 is connected to one end of the second current limiting resistor R221, the other end of the second current limiting resistor R221 is respectively connected to the anode of the second voltage stabilizing diode ZV2 and one end of the second transceiver circuit 221, and the cathode of the second voltage stabilizing diode ZV2 is respectively connected to the other end of the second transceiver circuit 221 and the neutral line N; or, the anode of the second diode D2 is connected to the communication line S, the cathode of the second diode D2 is connected to one end of the second current limiting resistor R221, the other end of the second current limiting resistor R221 is respectively connected to the cathode of the second voltage stabilizing diode ZV2 and one end of the second transceiver circuit 221, and the anode of the second voltage stabilizing diode ZV2 is respectively connected to the other end of the second transceiver circuit 221 and the neutral line N.

[0061] Specifically, the current direction of the second current loop circuit 22 is restricted by the second diode D2, thereby restricting the communication direction of the second current loop circuit 22 to make the communication direction of the second current loop circuit 22 consistent with that of the first current loop circuit 12. The second current-limiting resistor R221 uses a high-power and high-resistance resistor, which almost bears all the impedances of the current loop path and plays a current-limiting role during the multiplexing pre-charging (i.e., wake-up) stage and the normal communication stage. In addition, the number of the second current-limiting resistors R221 can be one or more, and there is no specific limitation. The second voltage-stabilizing diode ZV2 can protect the electronic components in the second transceiver circuit 221 from being damaged by the surge voltage, provide a current path during the wake-up stage, share the high voltage provided by the external power supply with the second current-limiting resistor R221, and prevent the second transceiver circuit 221 from being over-pressured.

[0062] For example, in Figure 2 the illustrated embodiment, the communication direction of the current loop path established by the second device 20 with the first device 10 through the second current loop circuit 22, the communication line S, the neutral line N, and the first current loop circuit 12 is counterclockwise. For details, reference can be made to Figure 4 shown; in Figure 3 the illustrated embodiment, the communication direction of the current loop path established by the second device 20 with the first device 10 through the second current loop circuit 22, the communication line S, the neutral line N, and the first current loop circuit 12 is clockwise.

[0063] In an embodiment of the present invention, the first end 1 of the power supply switch K2 is connected to the first input end of the second power supply circuit 21, the second end 2 of the power supply switch K2 is connected to the live wire L, the third end of the power supply switch K2 is connected to the communication line S, and the second input end of the second power supply circuit 21 is connected to the neutral line N; wherein, when the first end 1 and the third end 3 of the power supply switch K2 are connected, the power supply switch K2 is connected to the communication line S; when the first end 1 and the second end 2 of the power supply switch K2 are connected, the power supply switch K2 is connected to the live wire L.

[0064] That is to say, a single-pole double-throw switch is used as the power supply switch K2. The normally closed contact of the power supply switch K2 is connected between the communication line S and the second power supply circuit 21 and is used to transmit the pre-charging current in cooperation with the one-way pre-charging circuit 11 of the indoor unit during the pre-charging stage of the outdoor unit. The normally open contact of the power supply switch K2 is connected between the live wire L and the second power supply circuit 21 and is used to transmit the operating current during the normal operation stage of the air conditioner. In addition, a fuse tube can be connected in series between the third end 3 of the power supply switch K2 and the second power supply circuit 21 to play an over-current protection role.

[0065] During the pre-charging process of the second power supply circuit 21, the first end 1 of the power supply switch K2 is connected to the third end 3, and the first device 10 controls the one-way pre-charging circuit 11 to be in a conducting state. Under the one-way conduction effect of the pre-charging diode D, the one-way pre-charging circuit 11 only allows the current to flow from the communication line S to the power supply line. That is, during the pre-charging process, only half a cycle of alternating current is supplied to the second power supply circuit 21, and the second power supply circuit 21 is in a half-wave rectification state. For example, in Figure 2 In the embodiment, the second power supply circuit 21 is pre-charged with the alternating current in the negative half-cycle; in Figure 3 In the embodiment, the second power supply circuit 21 is pre-charged with the alternating current in the positive half-cycle.

[0066] After the pre-charging is completed, the second end 2 of the power supply switch K2 is controlled to be connected to the third end 3, and the one-way pre-charging circuit 11 is controlled to be disconnected. The external power supply directly supplies power to the second power supply circuit 21 through the live wire N and the neutral wire L, and the second power supply circuit 21 is in a full-wave rectification state.

[0067] In an embodiment of the present utility model, the first device 10 or the second device 20 further includes: a communication power supply circuit 13, which is respectively connected to the live wire L and the neutral wire N and is used to supply power to the current loop path.

[0068] That is to say, after the air conditioner 1000 is successfully awakened, the alternating current provided by the external power supply is rectified by the communication power supply circuit 13 to output the target direct current to supply power to the current loop path, so that the outdoor unit and the indoor unit can communicate based on the current loop path. Among them, the communication power supply circuit 13 can be arranged at the first device end 10 or at the second device 20, and there is no specific limitation.

[0069] In an embodiment of the present utility model, when the first device 10 includes the communication power supply circuit 13, the communication power supply circuit 13 includes: a first capacitor C1, a third voltage regulator ZV3, a first resistor R1, a second resistor R2, and a third diode D3. One end of the first capacitor C1 is connected to the other end of the first transceiver circuit 121, the other end of the first capacitor C1 is connected to the neutral wire N, the anode of the third voltage regulator ZV2 is connected to one end of the first capacitor C1, the cathode of the third voltage regulator ZV2 is connected to the other end of the first capacitor C1, the first resistor R1 is connected in parallel with the first capacitor C1, one end of the second resistor R2 is connected to one end of the first capacitor C1, the other end of the second resistor R2 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the live wire L.

[0070] That is to say, the communication voltage output by the communication power supply circuit 13 is provided by the first capacitor C1, and the voltage of the first capacitor C1 is obtained by half-wave rectification, voltage division, and voltage stabilization of the power line L / N line of the first device 10 through the third diode D3, the first resistor R1, the second resistor R2, and the third voltage regulator ZV2.

[0071] Specifically, when the alternating current provided by the external power supply is in the negative half-cycle, the third diode D3 conducts, and the alternating current flows into the communication power supply circuit 13. On the one hand, it supplies power to the current loop path based on the negative half-cycle alternating current, and on the other hand, it charges the first capacitor C1 based on the negative half-cycle alternating current. When the alternating current is in the positive half-cycle, the third diode D3 is cut off, and the alternating current cannot flow into the communication power supply circuit 13. The first capacitor C1 discharges to continuously supply power to the current loop path.

[0072] Thus, this embodiment realizes power extraction from the negative half-cycle of the alternating current based on the third diode D3, and discharges the first capacitor C1 in the positive half-cycle of the alternating current to achieve continuous power supply and ensure continuous communication.

[0073] In an embodiment of the present utility model, the first device 10 further includes: a first power supply circuit 14, and the first power supply circuit 14 is respectively connected to the live wire L and the neutral wire N for supplying power to the first device 10.

[0074] That is to say, when the external power supply supplies power to the air conditioner 1000, the alternating current provided by the external power supply is input to the power line. The first power supply circuit 14 extracts power from the power line, converts the alternating current provided by the external power supply into the target direct current, and supplies power to the first device 10, so that the first device 10 is powered on and starts.

[0075] In an embodiment of the present utility model, the first device 10 further includes a first control circuit 15. The first transceiver circuit 121 includes: a first receiving optocoupler IC1, a first transmitting optocoupler IC2, and a first transmitting switch Q1. The first end of the first receiving optocoupler IC1 serves as one end of the first transceiver circuit 121. The second end of the first receiving optocoupler IC1 is connected to the third end of the first transmitting optocoupler IC2. The third end of the first receiving optocoupler IC1 is connected to the first preset power supply Vcc-A. The fourth end of the first receiving optocoupler IC1 is connected to the first control circuit 15. The first end of the first transmitting optocoupler IC2 is connected to the first preset power supply Vcc-A. The second end of the first transmitting optocoupler IC2 is connected to the first control circuit 15 through the first transmitting switch Q1. The fourth end of the first transmitting optocoupler IC2 serves as the other end of the first transceiver circuit 121.

[0076] Specifically, in the normal communication stage, the communication power supply circuit 13 provides the communication voltage, and there is current flowing through the current loop path. The first device 10 and the second device 20 can communicate based on the current loop path.

[0077] Taking the first device 10 as the indoor unit and the second device 20 as the outdoor unit as an example, when it is in the stage of the outdoor unit sending and the indoor unit receiving, if the outdoor unit sends a high level, the current loop path remains conducting, the first receiving optocoupler IC1 conducts, and the signal receiving pin RXD1 of the first control circuit 15 is at a high level; if the outdoor unit sends a low level, the current loop path is disconnected, the first receiving optocoupler IC1 is cut off, and the signal receiving pin RXD1 of the first control circuit 15 is at a low level. When it is in the stage of the indoor unit sending and the outdoor unit receiving, when the first control circuit 15 outputs a low level signal through the signal sending pin TXD1, the first sending switch Q1 is disconnected, the first sending optocoupler IC2 is cut off, and the current loop path is disconnected; when the first control circuit 15 outputs a high level signal through the signal sending pin TXD1, the first sending switch Q1 conducts, the first sending optocoupler IC2 conducts, and the current loop path is in a conducting state.

[0078] This embodiment is based on an optocoupler to establish a current loop path, so as to realize the communication of controlling the strong power part through the weak power part, achieve the effect of isolating the strong and weak powers, and make the weak power part work without being affected by the strong power part.

[0079] In addition, the first control circuit 15 can also control the pre-charge switch K1. For example, when the pre-charge switch K1 is a soft start switch, the on or off of the pre-charge switch K1 is controlled by the PWM (Pulse Width Modulation) signal output by the first control circuit 15.

[0080] In an embodiment of the present invention, the second device 20 further includes a second control circuit 23. The second transceiver circuit 221 includes: a second receiving optocoupler IC3, a second sending optocoupler IC4 and a second sending switch. The first end of the second receiving optocoupler IC3 is used as the other end of the second transceiver circuit 221. The second end of the second receiving optocoupler IC3 is connected to the third end of the second sending optocoupler IC4. The third end of the second receiving optocoupler IC3 is connected to the second preset power supply Vcc-B. The fourth end of the second receiving optocoupler IC3 is connected to the second control circuit 23. The first end of the second sending optocoupler IC4 is connected to the second preset power supply Vcc-B. The second end of the second sending optocoupler IC4 is connected to the second control circuit 23 through the second sending switch Q2. The fourth end of the second sending optocoupler IC4 is used as one end of the second transceiver circuit 221.

[0081] Specifically, in the normal communication stage, the communication power supply circuit 13 provides a communication voltage, and there is current flowing through the current loop path. The first device 10 and the second device 20 can communicate based on the current loop path.

[0082] Taking the first device 10 as the indoor unit and the second device 20 as the outdoor unit as an example, when in the stage of the indoor unit sending and the outdoor unit receiving, if the indoor unit sends a high level, the current loop path remains conducting, the second receiving optocoupler IC3 conducts, and the signal receiving pin RXD2 of the second control circuit 23 is at a high level; if the indoor unit sends a low level, the current loop path is disconnected, the second receiving optocoupler IC3 is cut off, and the signal receiving pin RXD1 of the second control circuit 23 is at a low level. When in the stage of the outdoor unit sending and the indoor unit receiving, when the second control circuit 23 outputs a low level signal through the signal sending pin TXD2, the second sending switch Q2 is disconnected, the second sending optocoupler IC4 is cut off, and the current loop path is disconnected; when the second control circuit 23 outputs a high level signal through the signal sending pin TXD2, the second sending switch Q2 conducts, the second sending optocoupler IC4 conducts, and the current loop path is in a conducting state.

[0083] This embodiment is based on an optocoupler to establish a current loop path, so as to realize the communication control of the strong power part through the weak power part, achieve the effect of isolating the strong and weak powers, and make the weak power part work without being affected by the strong power part.

[0084] As a specific embodiment of the present application, the circuit of the air conditioner 1000 is as Figure 2 shown. The first device 10 is the indoor unit, the second device 20 is the outdoor unit, and the working timing of the air conditioner 1000 is as Figure 5 shown. Then, the working process of the air conditioner can be as Figure 6 shown, including the following steps:

[0085] S101, the indoor unit is powered on, and the first control circuit and the display device are powered on and work. Among them, step S101 is the power-on standby stage of the air conditioner, and the indoor main control board establishes communication with the display board.

[0086] S102, determine whether a start-up instruction from the remote control is received. If so, execute step S103 to enter the multiplexing pre-charging stage, that is, the wake-up stage; if not, return to step S101 to maintain the power-on standby state.

[0087] S103, the first control circuit controls the pre-charging switch to conduct, and the external power supply pre-charges the second power supply circuit through the live wire, the one-way pre-charging circuit, the communication line, and the neutral wire.

[0088] Specifically, in the multiplexing pre-charging stage, the second power supply circuit is pre-charged in a half-wave rectification manner.

[0089] In Figure 2 the shown embodiment, in the positive half cycle of the alternating current, the potential of the live wire L is greater than the potential of the communication line S, the pre-charging diode D is in a reverse cut-off state, the communication line S and the live wire L are still in an open state, the second power supply circuit is not pre-charged, and no high voltage will be generated in the current loop path.

[0090] During the negative half - cycle of the alternating current, the potential of the live wire L is less than that of the communication wire S. The pre - charge diode D is in the forward conduction state, and the communication wire S and the live wire L are equivalent to a short - circuit state. The outdoor unit is charged through the normally - closed contact of the power supply switch of the outdoor unit. At the same time, the first current - limiting resistor R121 of the indoor unit plays a role in limiting the starting current. Because in the design, the pre - charge diode D and the first diode D1 cannot form a series connection path, the voltage provided by the external power supply at this time is blocked by the first diode D1 and will not be applied to the indoor unit side. On the outdoor unit side, the second current - limiting resistor R221 and the second voltage - stabilizing diode ZV2 share the high - voltage electricity provided by the external power supply together.

[0091] As Figure 5 shown, during the multiplexed pre - charge stage, I_D1 is zero, I_D is the half - wave current for which the contour line converges, and I_D2 is the half - wave current that is small first and then stable.

[0092] S104, The second control circuit is powered on and operates to obtain the voltage of the energy - storage capacitor E2. Specifically, the voltage value of the outdoor unit E2 can be monitored through the outdoor bus voltage monitoring circuit.

[0093] S105, Determine whether the voltage of the energy - storage capacitor E2 reaches the set value Ve. If so, it is determined that the pre - charging is completed, and step S106 is executed to enter the normal operation stage; if not, it is determined that the pre - charging is not completed, and step S103 is continued to be executed.

[0094] S106, The pre - charge switch is disconnected, the power supply switch is connected to the live wire, and the external power supply continues to supply power to the outdoor unit through the power cord.

[0095] S107, An electric - current loop path is established between the indoor unit and the outdoor unit, and corresponding remote - controller instructions are executed based on the communication.

[0096] As Figure 5 shown, during the normal operation stage, I_D1 is the square - wave communication current, I_D is zero, and I_D2 is the square - wave communication current.

[0097] S108, Determine whether a shutdown instruction from the remote controller is received. If so, step S109 is executed to enter the shutdown standby stage; if not, step S106 is continued to be executed.

[0098] S109, All loads of the outdoor unit stop working.

[0099] S110, The pre - charge switch remains disconnected, and the power supply switch is connected to the communication wire. Return to step S101 to enter the standby state. As Figure 5 shown, when entering the shutdown standby stage, I_D1, I_D, and I_D2 are all zero.

[0100] Thus, the air conditioner can ensure that there is no large current on the indoor unit side, almost eliminating the risk of fire accidents. At the same time, it adopts a half-wave rectification method to balance the requirements for the loop resistance in the pre-charging and communication stages, ensuring both safe wake-up and reliable communication.

[0101] In addition, the communication optocoupler of the indoor unit will not bear the high voltage provided by the external power supply. The outdoor communication circuit bears almost all the impedance of the communication loop and acts as a current limiter in the pre-charging and normal communication stages. Compared with the circuit architecture in the related art, the impedance in this current loop path is doubled, which can reduce the current in the current loop path and facilitate the selection of components.

[0102] In summary, for the air conditioner according to the present invention, one of the first device and the second device is an indoor unit, and the other is an outdoor unit. The first device includes a unidirectional pre-charging circuit and a first current loop circuit. The unidirectional pre-charging circuit is connected to the communication line and the live wire respectively, and the first current loop circuit is connected to the communication line and the neutral wire respectively. The pre-charging direction of the unidirectional pre-charging circuit corresponds to the communication direction of the first current loop circuit. The second device includes a power supply switch and a second power supply circuit. The power supply switch selectively connects the communication line or the live wire, and the second power supply circuit is connected to the power supply switch and the neutral wire respectively. The second device is used to supply power to the second device. Among them, when the power supply switch is connected to the communication line, the external power supply pre-charges the second power supply circuit through the live wire, the unidirectional pre-charging circuit, the communication line and the neutral wire. Thus, based on the corresponding setting of the pre-charging direction of the unidirectional pre-charging circuit and the communication direction of the first current loop circuit, the air conditioner can ensure that the first current loop circuit does not bear the high voltage provided by the external power supply during the wake-up stage, realizing safe wake-up.

[0103] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0104] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0105] In the present utility model, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0106] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An air conditioner, characterized in that: include: a first device and a second device, wherein one of the first device and the second device is an indoor unit and the other is an outdoor unit; The first device includes a unidirectional pre-charging circuit and a first current loop circuit, the unidirectional pre-charging circuit is connected to the communication line and the live line respectively, the first current loop circuit is connected to the communication line and the neutral line respectively, and the pre-charging direction of the unidirectional pre-charging circuit corresponds to the communication direction of the first current loop circuit; The second device includes a power supply switch and a second power supply circuit, the power supply switch selectively connects the communication line or the live line, and the second power supply circuit is respectively connected to the power supply switch and the neutral line, and is used to power the second device, wherein when the power supply switch is connected to the communication line, an external power supply pre-charges the second power supply circuit through the live line, the unidirectional pre-charging circuit, the communication line and the neutral line.

2. The air conditioner according to claim 1, characterized in that: The first current loop circuit includes: a first diode and a first transceiver circuit, the anode of the first diode is connected to the communication line, one end of the first transceiver circuit is connected to the cathode of the first diode, and the other end of the first transceiver circuit is connected to the neutral line; or, the cathode of the first diode is connected to the communication line, one end of the first transceiver circuit is connected to the anode of the first diode, and the other end of the first transceiver circuit is connected to the neutral line.

3. The air conditioner according to claim 2, characterized in that: The first current loop circuit further includes: a first current limiting resistor, which is connected in series between the first diode and one end of the first transceiver circuit.

4. The air conditioner according to claim 3, characterized in that: The first current limiting resistor is a thermistor.

5. The air conditioner according to claim 2, characterized in that: The first current loop circuit also includes: a first voltage regulator tube, the cathode of the first voltage regulator tube is respectively connected to the cathode of the first diode and one end of the first transceiver circuit, and the anode of the first voltage regulator tube is respectively connected to the other end of the first transceiver circuit and the neutral line; or, the anode of the first voltage regulator tube is respectively connected to the anode of the first diode and one end of the first transceiver circuit, and the cathode of the first voltage regulator tube is respectively connected to the other end of the first transceiver circuit and the neutral line.

6. The air conditioner according to any one of claims 2 to 5, characterized in that: The unidirectional pre-charging circuit includes: a pre-charging diode, a pre-charging resistor and a pre-charging switch connected in series between the communication line and the live line, and the anode of the pre-charging diode is respectively connected to the communication line and the anode of the first diode; or, the cathode of the pre-charging diode is respectively connected to the communication line and the cathode of the first diode; wherein, when the power supply switch is connected to the communication line and the pre-charging switch is closed, the external power supply pre-charges the second power supply circuit through the live line, the unidirectional pre-charging circuit, the communication line and the neutral line.

7. The air conditioner according to claim 2, characterized in that: The second device also includes: a second current loop circuit, which is respectively connected to the communication line and the neutral line, and the communication direction of the second current loop circuit is consistent with the communication direction of the first current loop circuit, wherein, when the power supply switch is connected to the live line, the external power supply supplies power to the second power supply circuit through the live line and the neutral line, and the second device establishes a current loop path with the first device through the second current loop circuit, the communication line, the neutral line and the first current loop circuit.

8. The air conditioner according to claim 7, characterized in that: The second current loop circuit includes: a second diode, a second current limiting resistor, a second voltage-stabilizing diode and a second transceiver circuit, wherein the cathode of the second diode is connected to the communication line, the anode of the second diode is connected to one end of the second current limiting resistor, the other end of the second current limiting resistor is respectively connected to the anode of the second voltage-stabilizing diode and one end of the second transceiver circuit, and the cathode of the second voltage-stabilizing diode is respectively connected to the other end of the second transceiver circuit and the neutral line; or, the anode of the second diode is connected to the communication line, the cathode of the second diode is connected to one end of the second current limiting resistor, the other end of the second current-limiting resistor is respectively connected to the cathode of the second voltage-stabilizing diode and one end of the second transceiver circuit, and the anode of the second voltage-stabilizing diode is respectively connected to the other end of the second transceiver circuit and the neutral line.

9. The air conditioner according to claim 7, characterized in that: The first end of the power supply switch is connected to the first input end of the second power supply circuit, the second end of the power supply switch is connected to the live wire, the third end of the power supply switch is connected to the communication line, and the second input end of the second power supply circuit is connected to the neutral line; wherein, when the first end and the third end of the power supply switch are connected, the power supply switch is connected to the communication line; when the first end and the second end of the power supply switch are connected, the power supply switch is connected to the live wire.

10. The air conditioner according to claim 7, characterized in that: The first device or the second device further includes: a communication power supply circuit, which is connected to the live wire and the neutral wire respectively and is used to supply power to the current loop path.

11. The air conditioner according to claim 10, characterized in that: In the case where the first device includes the communication power supply circuit, the communication power supply circuit includes: a first capacitor, a third voltage regulator, a first resistor, a second resistor and a third diode, one end of the first capacitor is connected to the other end of the first transceiver circuit, the other end of the first capacitor is connected to the neutral line, the anode of the third voltage regulator is connected to one end of the first capacitor, the cathode of the third voltage regulator is connected to the other end of the first capacitor, the first resistor is connected to the first capacitor in parallel, one end of the second resistor is connected to one end of the first capacitor, the other end of the second resistor is connected to the anode of the third diode, and the cathode of the third diode is connected to the live line.

12. The air conditioner according to claim 1, characterized in that: The first device further includes: a first power supply circuit, which is connected to the live wire and the neutral wire respectively and is used to supply power to the first device.

13. The air conditioner according to claim 2, characterized in that: The first device also includes a first control circuit, and the first transceiver circuit includes: a first receiving optocoupler, a first transmitting optocoupler and a first transmitting switch, the first end of the first receiving optocoupler serves as one end of the first transceiver circuit, the second end of the first receiving optocoupler is connected to the third end of the first transmitting optocoupler, the third end of the first receiving optocoupler is connected to a first preset power supply, the fourth end of the first receiving optocoupler is connected to the first control circuit, the first end of the first transmitting optocoupler is connected to the first preset power supply, the second end of the first transmitting optocoupler is connected to the first control circuit through the first transmitting switch, and the fourth end of the first transmitting optocoupler serves as the other end of the first transceiver circuit.

14. The air conditioner according to claim 8, characterized in that: The second device also includes a second control circuit, and the second transceiver circuit includes: a second receiving optocoupler, a second transmitting optocoupler, and a second transmitting switch, the first end of the second receiving optocoupler serves as the other end of the second transceiver circuit, the second end of the second receiving optocoupler is connected to the third end of the second transmitting optocoupler, the third end of the second receiving optocoupler is connected to a second preset power supply, the fourth end of the second receiving optocoupler is connected to the second control circuit, the first end of the second transmitting optocoupler is connected to the second preset power supply, the second end of the second transmitting optocoupler is connected to the second control circuit through the second transmitting switch, and the fourth end of the second transmitting optocoupler serves as one end of the second transceiver circuit.

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