Air conditioning system

Abstract

The embodiment of the invention provides an air conditioning system, and relates to the technical field of air conditioners. According to the air conditioning system, indoor and outdoor communication is independently carried out through the indoor and outdoor master control circuit and the communication circuit without mutual influence. The air conditioning system comprises an indoor unit and an outdoor unit, the indoor unit comprises an indoor unit main control circuit and an indoor unit communication circuit, and the control end of the indoor unit communication circuit is electrically connected with the signal sending end of the indoor unit main control circuit; the outdoor unit comprises an outdoor unit main control circuit and an outdoor unit communication circuit. The control end of the outdoor unit communication circuit is electrically connected with the signal sending end of the outdoor unit main control circuit. The indoor unit communication circuit and the outdoor unit communication circuit comprise a first loop and a second loop; the signal sending end of the indoor unit master control circuit sends a first control signal to conduct the first loop, and the outdoor unit master control circuit receives the first signal; and the signal transmitting end of the outdoor unit master control circuit transmits a second control signal to conduct the second loop, and the indoor unit master control circuit receives the second signal.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to an air conditioning system. Background Technology

[0002] With the development of science and technology, the application of electrical appliances is becoming more and more common, and air conditioning has become an integral part of the daily lives of more and more people.

[0003] Currently, air conditioning systems include a power control circuit, primarily used to control the power supply to the outdoor unit. This circuit needs to control a power switch, which can be an electromagnetic relay, or alternatively, a silicon controlled rectifier (SCR) optocoupler, solid-state relay, or other switching devices. Regardless of the type of switch, a significant drive current is required, typically exceeding 10mA. This results in high energy consumption for the air conditioner, hindering further product adoption.

[0004] Meanwhile, the air conditioning system is equipped with a current loop communication circuit. All transmitting and receiving optocouplers in this circuit are connected in series on a single electrical loop. For indoor and outdoor communication to occur, the indoor and outdoor controllers must work in close coordination; both must operate simultaneously, otherwise communication is impossible. This makes communication between the indoor and outdoor units complex. Summary of the Invention

[0005] This invention provides an air conditioning system that enables independent communication between indoor and outdoor systems through indoor and outdoor main control circuits and communication circuits, without affecting each other.

[0006] The air conditioning system includes an indoor unit and an outdoor unit, the outdoor unit being electrically connected to the indoor unit. The indoor unit includes an indoor unit main control circuit and an indoor unit communication circuit, the control terminal of the indoor unit communication circuit being electrically connected to the signal transmitting terminal of the indoor unit main control circuit. The indoor unit main control circuit is configured to control the operation of the indoor unit communication circuit. The outdoor unit includes an outdoor unit main control circuit and an outdoor unit communication circuit, the control terminal of the outdoor unit communication circuit being electrically connected to the signal transmitting terminal of the outdoor unit main control circuit. A first terminal of the outdoor unit communication circuit is also electrically connected to a first terminal of the indoor unit communication circuit. The outdoor unit main control circuit is configured to control the operation of the outdoor unit communication circuit. The indoor unit communication circuit and the outdoor unit communication circuit include a first circuit and a second circuit. The signal transmitting terminal of the indoor unit main control circuit sends a first control signal to activate the first circuit, and the outdoor unit main control circuit receives the first signal. The signal transmitting terminal of the outdoor unit main control circuit sends a second control signal to activate the second circuit, and the indoor unit main control circuit receives the second signal.

[0007] Based on the above solution, some embodiments of this application provide an air conditioning system in which an indoor unit communication circuit and an outdoor unit communication circuit jointly construct a first loop and a second loop. The first loop is used by the indoor unit's main control circuit to control the indoor unit to send signals to the outdoor unit, while the outdoor unit's main control circuit can receive a first signal in the first loop. The second loop is used by the outdoor unit's main control circuit to control the outdoor unit to send signals to the indoor unit, while the indoor unit's main control circuit can receive a second signal in the second loop. In this way, the indoor unit can send signals to the outdoor unit at any time and will only receive control from the indoor unit's main control circuit, independent of the outdoor unit; similarly, the outdoor unit can also send signals to the indoor unit at any time and will only receive control from the outdoor unit's main control circuit, independent of the indoor unit; thus enabling independent communication between the indoor and outdoor units without interference.

[0008] In some embodiments, the indoor unit further includes: an indoor unit live wire terminal, an indoor unit neutral wire terminal, and an indoor unit communication terminal; the outdoor unit further includes: a connector, an outdoor unit live wire terminal, an outdoor unit neutral wire terminal, and an outdoor unit communication terminal; the input end of the connector is electrically connected to AC power, the live wire output end of the connector is electrically connected to the indoor unit live wire terminal, and also electrically connected to the outdoor unit live wire terminal; the neutral wire output end of the connector is electrically connected to the indoor unit neutral wire terminal, and also electrically connected to the outdoor unit neutral wire terminal; the communication output end of the connector is electrically connected to the indoor unit communication terminal, and also electrically connected to the outdoor unit communication terminal.

[0009] In some embodiments, the outdoor unit further includes: a power control circuit, the first terminal of which is electrically connected to the live wire terminal of the outdoor unit, the second terminal of which is electrically connected to the output terminal of the first circuit, and the third terminal of which is electrically connected to the outdoor power conversion module; when the signal transmitting terminal of the indoor unit main control circuit sends a first control signal to make the first circuit conduct, the power control circuit conducts, and the AC power charges the outdoor power conversion module.

[0010] In some embodiments, the power control circuit includes: a first thyristor; the control terminal of the first thyristor is electrically connected to the second terminal of the power control circuit, the first terminal of the first thyristor is electrically connected to the first terminal of the power control circuit, and the second terminal of the first thyristor is electrically connected to the third terminal of the power control circuit.

[0011] In some embodiments, the power control circuit further includes: a first switch; the control terminal of the first switch is electrically connected to the control terminal of the outdoor unit main control circuit, the first terminal of the first switch is electrically connected to the first terminal of the power control circuit, and the second terminal of the first switch is electrically connected to the input terminal of the outdoor power conversion module; the first switch is configured to be turned on when the outdoor unit main control circuit is working normally.

[0012] In some embodiments, the indoor unit communication circuit includes: a first optocoupler and a second optocoupler; a first light-emitting end of the first optocoupler is electrically connected to the control terminal of the indoor unit communication circuit, and a second light-emitting end of the first optocoupler is electrically connected to the ground terminal; a first light-receiving end of the first optocoupler is electrically connected to the live wire terminal of the indoor unit, and a second light-receiving end of the first optocoupler is electrically connected to the communication terminal of the indoor unit; a first light-receiving end of the second optocoupler is electrically connected to a first power supply terminal, and a second light-receiving end of the second optocoupler is electrically connected to a first output terminal of the indoor unit communication circuit; a first light-emitting end of the second optocoupler is electrically connected to the neutral wire terminal of the indoor unit, and a second light-emitting end of the second optocoupler is electrically connected to the communication terminal of the indoor unit; the first output terminal of the indoor unit communication circuit is electrically connected to the signal receiving terminal of the indoor unit main control circuit; wherein, the first optocoupler is configured to conduct when the first control signal is received.

[0013] In some embodiments, the indoor unit communication circuit further includes: a first rectifier circuit and a third optocoupler; a first terminal of the first rectifier circuit is electrically connected to the live wire terminal of the indoor unit; a first light-receiving terminal of the third optocoupler is electrically connected to the first power supply terminal, and a second light-receiving terminal of the third optocoupler is electrically connected to the second output terminal of the indoor unit communication circuit; a first light-emitting terminal of the third optocoupler is electrically connected to the second terminal of the first rectifier circuit, and a second light-emitting terminal of the third optocoupler is electrically connected to the neutral wire terminal of the indoor unit; the second output terminal of the indoor unit communication circuit is electrically connected to the zero-crossing signal receiving terminal of the indoor unit main control circuit; the indoor unit main control circuit is configured to receive a zero-crossing signal when the third optocoupler is turned on.

[0014] In some embodiments, the outdoor unit communication circuit includes: a fourth optocoupler and a fifth optocoupler; the first light-emitting end of the fourth optocoupler is electrically connected to the control terminal of the outdoor unit communication circuit, and the second light-emitting end of the fourth optocoupler is electrically connected to the ground terminal; the second light-receiving end of the fourth optocoupler is electrically connected to the live wire terminal of the outdoor unit; the first light-receiving end of the fifth optocoupler is electrically connected to the first power supply terminal, and the second light-receiving end of the fifth optocoupler is electrically connected to the first output terminal of the outdoor unit communication circuit; the first light-emitting end of the fifth optocoupler is electrically connected to the first light-receiving end of the fourth optocoupler, and the second light-emitting end of the fifth optocoupler is electrically connected to the neutral wire terminal of the outdoor unit; the first output terminal of the outdoor unit communication circuit is electrically connected to the signal receiving terminal of the outdoor unit main control circuit; wherein, the fourth optocoupler is configured to conduct when the second control signal is received.

[0015] In some embodiments, the outdoor unit communication circuit further includes: a second rectifier circuit and a sixth optocoupler; a first terminal of the second rectifier circuit is electrically connected to the neutral wire terminal of the outdoor unit; a first light-receiving terminal of the sixth optocoupler is electrically connected to the first power supply terminal, and a second light-receiving terminal of the sixth optocoupler is electrically connected to the second output terminal of the outdoor unit communication circuit; a first light-emitting terminal of the sixth optocoupler is electrically connected to the second terminal of the second rectifier circuit, and a second light-emitting terminal of the sixth optocoupler is electrically connected to the live wire terminal of the outdoor unit; the second output terminal of the outdoor unit communication circuit is electrically connected to the zero-crossing signal receiving terminal of the outdoor unit main control circuit; the outdoor unit main control circuit is configured to receive a zero-crossing signal when the sixth optocoupler is turned on.

[0016] Some embodiments of this application also provide an air conditioning system, the air conditioning system including: an indoor unit main control circuit, an indoor unit communication circuit, an outdoor unit main control circuit, and an outdoor unit communication circuit; the control terminal of the indoor unit communication circuit is electrically connected to the signal transmitting terminal of the indoor unit main control circuit; the indoor unit main control circuit is configured to control the operation of the indoor unit communication circuit.

[0017] The control terminal of the outdoor unit communication circuit is electrically connected to the signal transmitting terminal of the outdoor unit main control circuit; the first terminal of the outdoor unit communication circuit is also electrically connected to the first terminal of the indoor unit communication circuit; the outdoor unit main control circuit is configured to control the operation of the outdoor unit communication circuit.

[0018] The indoor unit communication circuit and the outdoor unit communication circuit include: a first circuit and a second circuit; the signal transmitting end of the indoor unit main control circuit sends a first control signal to enable the first circuit, and the outdoor unit main control circuit receives the first signal; the signal transmitting end of the outdoor unit main control circuit sends a second control signal to enable the second circuit, and the indoor unit main control circuit receives the second signal. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0020] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of this application;

[0021] Figure 2 A structural block diagram of an air conditioning system provided in an embodiment of this application;

[0022] Figure 3 A structural block diagram of an indoor unit provided in this application embodiment;

[0023] Figure 4 A structural block diagram of another air conditioning system provided in an embodiment of this application;

[0024] Figure 5 A structural block diagram of another air conditioning system provided in the embodiments of this application;

[0025] Figure 6 A structural block diagram of another air conditioning system provided in the embodiments of this application;

[0026] Figure 7 A schematic diagram of a connector provided for an embodiment of this application;

[0027] Figure 8 A schematic diagram of another connector provided in an embodiment of this application;

[0028] Figure 9 A specific schematic diagram of a power control circuit provided in an embodiment of this application;

[0029] Figure 10 A detailed schematic diagram of another power control circuit provided in an embodiment of this application;

[0030] Figure 11 A circuit diagram of an indoor unit provided in an embodiment of this application;

[0031] Figure 12 A circuit diagram of an outdoor unit provided in an embodiment of this application;

[0032] Figure 13 An overall circuit diagram of an indoor unit and an outdoor unit is provided for an embodiment of this application;

[0033] Figure 14 This is a timing diagram of an air conditioning system operation provided in an embodiment of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this invention have the meaning of enabling conduction. The specific meaning needs to be understood in conjunction with the context.

[0038] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] With the development of science and technology, the application of electrical appliances is becoming more and more common, and air conditioning has become an integral part of the daily lives of more and more people.

[0040] Currently, air conditioning systems include a power control circuit, primarily used to control the power supply to the outdoor unit. This circuit needs to control a power switch, which can be an electromagnetic relay, or alternatively, a silicon controlled rectifier (SCR) optocoupler, solid-state relay, or other switching devices. Regardless of the type of switch, a significant drive current is required, typically exceeding 10mA. This results in high energy consumption for the air conditioner, hindering further product adoption.

[0041] Meanwhile, the air conditioning system is equipped with a current loop communication circuit. All transmitting and receiving optocouplers in this circuit are connected in series on a single electrical loop. For indoor and outdoor communication to occur, the indoor and outdoor controllers must work in close coordination; both must operate simultaneously, otherwise communication is impossible. For example, when the indoor unit sends a communication command, the outdoor unit's optocoupler must be in a continuously conducting state; otherwise, the loop cannot be completed. Similarly, when the outdoor unit sends a communication command, the indoor unit's optocoupler must be in a continuously conducting state. This makes communication between the indoor and outdoor units complex.

[0042] Based on this, embodiments of the present invention provide an air conditioning system. For example... Figure 1 As shown, the air conditioning system 1000 includes an indoor unit 100 (also referred to as an air conditioning indoor unit) and an outdoor unit 200 (also referred to as an air conditioning outdoor unit). The indoor unit 100 is installed indoors, and the outdoor unit 200 can be installed outdoors.

[0043] like Figure 2 As shown, the outdoor unit 200 and the indoor unit 100 are electrically connected together via a connector 300; the input terminal of the connector 300 is electrically connected to AC power.

[0044] Alternating current (AC) is generally AC mains power, which is 220V.

[0045] In some embodiments, the connector 300 is disposed in the outdoor unit.

[0046] It should be noted that the connector shown in the figure is not installed in the outdoor unit; it is only one embodiment.

[0047] The connector 300 is equipped with a live wire (L), a neutral wire (N), and a communication line (SI). The indoor unit and the outdoor unit are connected together via the live wire (L), the neutral wire (N), and the communication line (SI). The connector 300 is connected to AC power to supply power to both the outdoor and indoor units.

[0048] The live wire of the AC power is electrically connected to the live wire input terminal of the connector 300, and the neutral wire of the AC power is electrically connected to the neutral wire input terminal of the connector 300.

[0049] like Figure 3As shown, the indoor unit 100 includes: an indoor unit main control circuit 1 and an indoor unit communication circuit 2.

[0050] The control terminal 201 of the indoor unit communication circuit 2 is electrically connected to the signal transmitting terminal 101 of the indoor unit main control circuit 1.

[0051] The indoor unit main control circuit 1 is configured to control the operation of the indoor unit communication circuit 2.

[0052] like Figure 4 As shown, the outdoor unit 200 includes: the outdoor unit main control circuit 3 and the outdoor unit communication circuit 4.

[0053] The control terminal 401 of the outdoor unit communication circuit 4 is electrically connected to the signal transmitting terminal 301 of the outdoor unit main control circuit 3; the first terminal 402 of the outdoor unit communication circuit 4 is also electrically connected to the first terminal 202 of the indoor unit communication circuit 2.

[0054] The outdoor unit main control circuit 3 is configured to control the operation of the outdoor unit communication circuit 4.

[0055] like Figure 5 As shown, in some embodiments, the indoor unit 100 further includes an indoor power conversion module O1; the outdoor unit further includes an outdoor power conversion module O2.

[0056] One end of the indoor power conversion module O1 is electrically connected to the connector 300, and the other end of the indoor power conversion module O1 is electrically connected to the indoor unit main control circuit 1; the indoor power conversion module O1 is configured to supply power to the indoor unit main control circuit 1.

[0057] One end of the outdoor power conversion module O2 is electrically connected to the connector 300, and the other end of the outdoor power conversion module O2 is electrically connected to the outdoor unit main control circuit 3; the outdoor power conversion module O2 is configured to supply power to the outdoor unit main control circuit 3.

[0058] like Figure 6 As shown, the indoor unit communication circuit 2 and the outdoor unit communication circuit 4 include: a first circuit 5 and a second circuit 6.

[0059] Since the indoor unit communication circuit 2 is electrically connected to the outdoor unit communication circuit 4, the circuits in the indoor unit communication circuit 2 and the outdoor unit communication circuit 4 together constitute the first circuit 5 and the second circuit 6.

[0060] The signal transmitting end 101 of the indoor unit main control circuit 1 sends a first control signal to make the first circuit 5 conduct, and the outdoor unit main control circuit 3 receives the first signal.

[0061] The signal transmitting end 301 of the outdoor unit main control circuit 3 sends a second control signal to make the second circuit 6 conduct, and the indoor unit main control circuit 1 receives the second signal.

[0062] In other words, the first circuit and the second circuit are two separate circuits, and each circuit is activated under the control of the corresponding indoor unit main control circuit 1 or outdoor unit main control circuit 3.

[0063] If the indoor unit needs to send a signal to the outdoor unit, the signal transmitting end 101 of the indoor unit main control circuit 1 sends a first control signal to the indoor unit communication circuit 2, which then makes the first circuit 5 conduct. In the first circuit 5, the outdoor unit main control circuit 3 will receive the first signal, thereby completing the communication between the indoor unit and the outdoor unit.

[0064] Similarly, if the outdoor unit needs to send a signal to the indoor unit, the signal transmitting end 301 of the outdoor unit main control circuit 3 sends a second control signal to the outdoor unit communication circuit 4, which then makes the second circuit 6 conduct. In the second circuit 6, the indoor unit main control circuit 1 will receive the second signal, thereby completing the communication between the indoor unit and the outdoor unit.

[0065] It should be noted that the numbers 5~2 / 4 and 6~2 / 4 in the diagram refer to the first circuit 5 and the second circuit 6 belonging to the indoor unit communication circuit 2 and the outdoor unit communication circuit 4.

[0066] Based on the above solution, some embodiments of this application provide an air conditioning system in which an indoor unit communication circuit 2 and an outdoor unit communication circuit 4 jointly construct a first loop and a second loop. The first loop is used by the indoor unit main control circuit to control the indoor unit to send signals to the outdoor unit, while the outdoor unit main control circuit can receive a first signal in the first loop. The second loop is used by the outdoor unit main control circuit to control the outdoor unit to send signals to the indoor unit, while the indoor unit main control circuit can receive a second signal in the second loop. In this way, the indoor unit can send signals to the outdoor unit at any time and will only receive control from the indoor unit main control circuit, independent of the outdoor unit; similarly, the outdoor unit can also send signals to the indoor unit at any time and will only receive control from the outdoor unit main control circuit, independent of the indoor unit; thus, indoor and outdoor communication can be carried out independently without affecting each other.

[0067] like Figure 7 , Figure 8 and Figure 13 As shown, in some embodiments, the indoor unit 100 further includes: an indoor unit live wire terminal 7L, an indoor unit neutral wire terminal 7N, and an indoor unit communication terminal 7SI.

[0068] The outdoor unit also includes: outdoor unit live wire terminal 8L, outdoor unit neutral wire terminal 8N and outdoor unit communication terminal 8SI.

[0069] The input end of connector 300 is electrically connected to AC power, and the live wire output end of connector is electrically connected to the live wire terminal 7L of the indoor unit and also to the live wire terminal 8L of the outdoor unit.

[0070] The neutral output terminal of connector 300 is electrically connected to the indoor unit neutral terminal 7N and also to the outdoor unit neutral terminal 8N.

[0071] The communication output terminal of connector 300 is electrically connected to the communication terminal 7SI of the indoor unit and also to the communication terminal 8SI of the outdoor unit.

[0072] like Figure 7 and Figure 8 As shown, in some embodiments, a connector is also provided in the indoor unit, so that the connector of the outdoor unit is electrically connected to the connector of the indoor unit. The connector of the indoor unit is also electrically connected to the indoor unit live wire terminal 7L, the indoor unit neutral wire terminal 7N and the indoor unit communication terminal 7SI, thereby realizing the communication connection between the outdoor unit and the indoor unit.

[0073] It should be noted that, for easy differentiation, the connector of the indoor unit is labeled 7, and the connector of the outdoor unit is labeled 8.

[0074] In some embodiments, the connector described above is a terminal block.

[0075] like Figure 9 , Figure 10 and Figure 13 As shown, the outdoor unit 200 also includes a power control circuit 9.

[0076] The first terminal of the power control circuit 9 is electrically connected to the outdoor unit's live wire terminal 8L, the second terminal of the power control circuit is electrically connected to the output terminal of the first circuit 5, and the third terminal of the power control circuit 9 is electrically connected to the outdoor power conversion module O2.

[0077] The power control circuit 9 includes: a first thyristor Q1; the control terminal of the first thyristor Q1 is electrically connected to the second terminal of the power control circuit, the first terminal of the first thyristor Q1 is electrically connected to the first terminal of the power control circuit, and the second terminal of the first thyristor Q1 is electrically connected to the third terminal of the power control circuit.

[0078] The power control circuit 9 also includes: a first switch K1; the control terminal of the first switch K1 is electrically connected to the control terminal of the outdoor unit main control circuit 3, the first terminal of the first switch K1 is electrically connected to the first terminal of the power control circuit, and the second terminal of the first switch K1 is electrically connected to the input terminal of the outdoor power conversion module.

[0079] The power control circuit 9 also includes: a third thermistor RT3, an eighth resistor R8, and a ninth resistor R9.

[0080] The outdoor unit communication circuit includes: a seventh optocoupler B7. The first light-emitting end of the seventh optocoupler B7 is electrically connected to the outdoor unit communication terminal 8SI via a first thermistor RT1. The first light-receiving end of the seventh optocoupler B7 is electrically connected to the first end of an eighth resistor. The second light-receiving end of the seventh optocoupler B7 is electrically connected to the first end of a ninth resistor. It is also electrically connected to the control end of the first thyristor Q1.

[0081] The first end of the third thermistor RT3 is electrically connected to the outdoor unit's live wire terminal 8L, the second end of the third thermistor RT3 is electrically connected to the second end of the eighth resistor, and is also electrically connected to the first end of the first thyristor Q1.

[0082] In some embodiments, the seventh optocoupler B7 is an optocoupler thyristor.

[0083] A thyristor optocoupler is a special type of optocoupler that converts an input optical signal into an output control electrical signal, enabling the control and regulation of high-power devices. This device mainly consists of a light source, a photoelectric conversion element, and a thyristor, and features high voltage resistance, high temperature resistance, and high response speed, achieving both opto-isolation and electrical control functions. Thyristor optocouplers have wide applications in various fields, including industrial control, power electronics, medical equipment, automotive electronics, and communication equipment.

[0084] The thyristor, also known as a silicon controlled rectifier (SCR), is an important semiconductor switching element widely used in power electronics and industrial control systems. It consists of three PN junctions, with an anode, a cathode, and a gate. The basic working principle of a thyristor is to control its conduction state by applying a forward bias voltage to the gate, thereby controlling the current.

[0085] When a thyristor is turned on, a positive trigger current needs to be applied to its gate. This trigger current is typically a pulse signal with a sufficiently large width and amplitude to ensure that the anode current reaches the minimum value required to maintain the on-state.

[0086] In other words, a thyristor only needs one trigger signal to turn on and will turn off only when the next zero-crossing signal appears. Furthermore, the drive current used to turn on a thyristor is relatively small and the switching is intermittent, which can further reduce power consumption.

[0087] When the first control signal is sent at the signal transmitting end of the indoor unit main control circuit 1 to make the first circuit 5 conduct, the seventh optocoupler B7 conducts, making the first thyristor Q1 conduct, and finally making the power control circuit 9 conduct, so that the AC power charges the outdoor power conversion module.

[0088] The first switch K1 is configured to be turned on when the outdoor unit main control circuit 3 is working normally.

[0089] When the outdoor power conversion module can normally supply power to the indoor unit main control circuit 1, the indoor unit main control circuit 1 controls the first switch K1 to close, so that the third thermistor RT3 and the first thyristor Q1 are short-circuited, and the AC power directly charges the outdoor power conversion module.

[0090] Among them, the seventh optocoupler B7 is used to receive signals from the communication line and control the conduction of the first thyristor Q1; the eighth resistor R8 and the ninth resistor R9 are bias and current limiting resistors, which control the conduction of the first thyristor Q1 when the conduction signal arrives.

[0091] The first thyristor Q1 is connected to the third thermistor RT3. The two are connected in series between the live wire L and the outdoor power conversion module. When the first thyristor Q1 is turned on, the power is supplied to the outdoor power conversion module through the third thermistor RT3 and the first thyristor Q1. At the same time, the outdoor power conversion module is connected to the neutral wire N, so the outdoor power conversion module is powered.

[0092] The ninth resistor R9 is the bias resistor for the gate G of the first thyristor, so that the first thyristor Q1 can form a trigger level circuit when it receives a trigger signal.

[0093] It should be noted that PTC is an abbreviation for Positive Temperature Coefficient, meaning a positive temperature coefficient, generally referring to semiconductor materials or components with a large positive temperature coefficient. Usually, when we mention PTC, we are referring to a positive temperature coefficient thermistor, or simply a PTC thermistor. A PTC thermistor is a typical temperature-sensitive semiconductor resistor; above a certain temperature (Curie temperature), its resistance increases abruptly with increasing temperature.

[0094] like Figure 11 As shown, the indoor unit communication circuit 2 includes: a first optocoupler B1 and a second optocoupler B2.

[0095] The first light-emitting end of the first optocoupler B1 is electrically connected to the control terminal of the indoor unit communication circuit 2, and the second light-emitting end of the first optocoupler B1 is electrically connected to the ground terminal; the first light-receiving end of the first optocoupler B1 is electrically connected to the indoor unit live wire terminal 7L, and the second light-receiving end of the first optocoupler B1 is electrically connected to the indoor unit communication terminal 7SI.

[0096] The first light-receiving end of the second optocoupler B2 is electrically connected to the first power supply end, and the second light-receiving end of the second optocoupler B2 is electrically connected to the first output end of the indoor unit communication circuit 2; the first light-emitting end of the second optocoupler B2 is electrically connected to the indoor unit neutral wire terminal 7N, and the second light-emitting end of the second optocoupler B2 is electrically connected to the indoor unit communication terminal 7SI.

[0097] The first output terminal of the indoor unit communication circuit 2 is electrically connected to the signal receiving terminal of the indoor unit main control circuit 1; wherein, the first optocoupler B1 is configured to conduct when the first control signal is received.

[0098] The indoor unit communication circuit 2 also includes: a first rectifier circuit and a third optocoupler B3.

[0099] The first end of the first rectifier circuit is electrically connected to the live wire terminal 7L of the indoor unit; the first light-receiving end of the third optocoupler B3 is electrically connected to the first power supply end, and the second light-receiving end of the third optocoupler B3 is electrically connected to the second output end of the indoor unit communication circuit 2; the first light-emitting end of the third optocoupler B3 is electrically connected to the second end of the first rectifier circuit, and the second light-emitting end of the third optocoupler B3 is electrically connected to the neutral wire terminal 7N of the indoor unit.

[0100] The first rectifier circuit includes: a first resistor R1 and a first diode V1.

[0101] The second output terminal of the indoor unit communication circuit 2 is electrically connected to the zero-crossing signal receiving terminal of the indoor unit main control circuit 1; the indoor unit main control circuit 1 is configured to receive the zero-crossing signal when the third optocoupler B3 is turned on.

[0102] like Figure 12 As shown, the outdoor unit communication circuit 4 includes: a fourth optocoupler B4 and a fifth optocoupler B5.

[0103] The first light-emitting end of the fourth optocoupler B4 is electrically connected to the control end of the outdoor unit communication circuit 4, the second light-emitting end of the fourth optocoupler B4 is electrically connected to the grounding end, and the second light-receiving end of the fourth optocoupler B4 is electrically connected to the outdoor unit live wire terminal 8L.

[0104] The first light-receiving end of the fifth optocoupler B5 is electrically connected to the first power supply end, and the second light-receiving end of the fifth optocoupler B5 is electrically connected to the first output end of the outdoor unit communication circuit 4; the first light-emitting end of the fifth optocoupler B5 is electrically connected to the first light-receiving end of the fourth optocoupler B4, and the second light-emitting end of the fifth optocoupler B5 is electrically connected to the outdoor unit neutral wire terminal 8N.

[0105] The first output terminal of the outdoor unit communication circuit 4 is electrically connected to the signal receiving terminal of the outdoor unit main control circuit 3; wherein, the fourth optocoupler B4 is configured to conduct when the second control signal is received.

[0106] The indoor unit communication circuit 2 also includes: a second rectifier circuit and a sixth optocoupler B6.

[0107] The first end of the second rectifier circuit is electrically connected to the neutral wire terminal 8N of the outdoor unit; the first light-receiving end of the sixth optocoupler B6 is electrically connected to the first power supply end, and the second light-receiving end of the sixth optocoupler B6 is electrically connected to the second output end of the outdoor unit communication circuit 4; the first light-emitting end of the sixth optocoupler B6 is electrically connected to the second end of the second rectifier circuit, and the second light-emitting end of the sixth optocoupler B6 is electrically connected to the live wire terminal 8L of the outdoor unit.

[0108] The second rectifier circuit includes: the seventh resistor R7 and the twelfth diode V12.

[0109] The second output terminal of the outdoor unit communication circuit 4 is electrically connected to the zero-crossing signal receiving terminal of the outdoor unit main control circuit 3; the outdoor unit main control circuit 3 is configured to receive the zero-crossing signal when the sixth optocoupler B6 is turned on.

[0110] It should be noted that the voltage at the first power supply terminal is generally 5V.

[0111] like Figure 13 As shown, AC power is input to the outdoor unit's connector via the power line. The ground wire GND is a safety protection grounding line, and the live wire L and neutral wire N are power supply lines. After connection, they are connected to the outdoor unit and the indoor unit respectively. When connected to the outdoor unit, the live wire L is connected to the outdoor unit's live wire terminal 8L, and the neutral wire N is connected to the outdoor unit's neutral wire terminal 8N.

[0112] When not in standby mode, the outdoor unit's main control circuit 3 receives no power. At this time, the first switch K1 is open, and the first thyristor Q1 is also open, thus the outdoor unit's power supply is completely disconnected, and no standby power consumption occurs. Furthermore, the communication line between the indoor and outdoor main control circuits is the SI line. The SI line connects to the outdoor unit's communication terminal 8SI on the outdoor unit and to the indoor unit's communication terminal 7SI on the indoor unit. During air conditioning operation, the indoor and outdoor units transmit operating information via the SI line.

[0113] The aforementioned power supply is connected to the indoor unit's connector via the L-IN and N-IN terminals of the outdoor unit's connector. The live wire L is connected to the indoor unit's live wire terminal 7L, and the neutral wire N is connected to the indoor unit's neutral wire terminal 7N. After connection, it is connected to the indoor unit's indoor power conversion module. The indoor power conversion module converts the AC high-voltage power (e.g., AC220V / 50HZ) into DC low-voltage power (e.g., DC5V, 12V) and provides it to the control circuit to control the operation of the indoor circuit.

[0114] Meanwhile, the live wire L and the neutral wire N provide an AC zero-crossing detection circuit through the first rectifier circuit and the third optocoupler B3. The first resistor R1 serves to reduce voltage and limit current, the diode V1 serves to perform half-wave rectification, and the third optocoupler B3 serves to detect the AC zero-crossing signal (i.e., the position where the AC changes from positive to negative or from negative to positive) and send the detection result to the indoor unit's main control circuit. The second resistor R2 and the second diode V2 serve to clamp and protect the light-emitting end of the third optocoupler B3.

[0115] The first optocoupler B1, the second optocoupler B2, the fourth optocoupler B4, and the fifth optocoupler B5 serve the functions of signal transmission and electrical isolation.

[0116] Among them, the first optocoupler B1 is equivalent to the signal transmitting end of the indoor unit's main control circuit, the second optocoupler B2 is equivalent to the signal receiving end of the indoor unit's main control circuit, the fourth optocoupler B4 is equivalent to the signal transmitting end of the outdoor unit's main control circuit, and the fifth optocoupler B5 is equivalent to the signal receiving end of the outdoor unit's main control circuit.

[0117] Diodes V3, V4, V5, V6, V7, V8, V9, V10, and V11 provide unidirectional isolation and bypass clamping protection to prevent abnormally high voltage damage to the communication circuit caused by incorrect wiring during air conditioner installation.

[0118] For example, if the power supply wire L is mistakenly connected to the communication line SI of the indoor unit, the current cannot flow in reverse through the fifth diode V5 because of the presence of the fifth diode V5, thus protecting the second optocoupler B2 from damage.

[0119] If the neutral wire N is mistakenly connected to the communication line SI, the presence of the third diode V3 and the fourth diode V4 limits the voltage across the first optocoupler B1, protecting it from damage.

[0120] When an abnormally high current occurs, the first thermistor RT1 heats up rapidly, its resistance increases quickly, and the current is rapidly reduced, preventing damage to the communication circuit caused by incorrect wiring during air conditioner installation. For example, if the power supply live wire L is mistakenly connected to the communication line terminal X4, the first thermistor RT1 will heat up rapidly, its resistance will increase rapidly, and the current will be quickly reduced, thus protecting the seventh optocoupler B7 from damage.

[0121] The specific working process of the air conditioning system is as follows:

[0122] Power off state: When the air conditioning system is connected to AC power from the outdoor unit, the AC power is connected from the outdoor unit's connection 8 to the wiring terminals of the outdoor unit and the indoor unit respectively. The outdoor unit cannot be powered on because the first thyristor Q1 and the first switch K1 cannot be turned on.

[0123] The power supply is connected to the indoor unit through a connector. The indoor unit's indoor power conversion module converts AC high voltage (e.g., AC220V / 50HZ) into DC low voltage (e.g., DC5V, 12V) and supplies it to the control circuit to control the operation of the indoor circuit.

[0124] The third optocoupler B3 detects the zero-crossing signal of the AC current (i.e., the position where the AC current changes from positive to negative or vice versa). The first resistor R1 acts as a voltage divider and current limiter. The first diode V1 performs half-wave rectification and prevents reverse conduction. The second resistor R2 and the second diode V2 clamp and protect the light-emitting terminal of the third optocoupler B3. When the third optocoupler B3 is conducting, the indoor unit main control circuit 1 receives a 5V high level. When the third optocoupler B3 is not conducting, due to the pull-down of the third resistor R3 to ground, the indoor unit main control circuit 1 receives a 0V low level (refer to...). Figure 14 ).

[0125] Meanwhile, the live wire L or the neutral wire N is connected to the first optocoupler B1 and the second optocoupler B2 respectively after passing through the half-wave rectifier circuit, and finally connected to the communication line SI. After reaching the outside, it passes through the first thermistor RT1 and the seventh optocoupler B7 and is connected to the fifth optocoupler B5 and the fourth optocoupler B4 respectively, forming an indoor and outdoor communication circuit. The fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the second thermistor RT2 play the role of voltage reduction and current limiting.

[0126] Among them, the third diode V3, the fourth diode V4, the fifth diode V5, the sixth diode V6, the seventh diode V7, the eighth diode V8, the ninth diode V9, the tenth diode V10, and the schematic diode V11 serve as half-wave rectification, reverse cutoff, and clamping protection.

[0127] Standby state: The first optocoupler B1 does not send a signal, the first thyristor Q1 is not turned on, the outdoor unit main control circuit 3 controls the first switch K1 to open, the outdoor unit main control circuit 3 has no power and does not work, only the indoor control circuit is powered on and running.

[0128] Reference Figure 14 The third optocoupler B3 can only conduct after the AC signal crosses zero and its voltage rises above the optocoupler's turn-on voltage. Therefore, the third optocoupler B3 can detect the AC zero-crossing signal and output it to the indoor control circuit. At this time, the first optocoupler B1 is cut off, so no signal is output from the communication line SI to the outdoor unit controller, and the outdoor unit communication circuit cannot work.

[0129] When the power-on command is received: the indoor unit main control circuit 1 conducts the first optocoupler B1, at which time the current enters from the L line, passes through the fifth resistor R5, the third diode V3, the first optocoupler B1, the second thermistor RT2 in sequence, and then is output through the communication line SI to the first thermistor RT1, the seventh optocoupler B7, the eighth diode V8, the fifth optocoupler B5 of the outdoor unit, and then returns to the neutral wire terminal 8N of the outdoor unit.

[0130] After the seventh optocoupler B7 is turned on, it triggers the first thyristor Q1 to turn on. After the first thyristor Q1 is turned on, the power supply line L is connected from the third thermistor RT3 and the first thyristor Q1 to supply power to the outdoor power conversion module. After a certain period of time (e.g., 2 seconds), the power conversion module can stably supply power to the outdoor unit's main control circuit 3 (refer to...). Figure 14 ).

[0131] After the outdoor unit's main control circuit 3 is working normally, the first switch K1 is closed, bypassing the third thermistor RT3 and the first thyristor Q1, i.e., short-circuiting them. During air conditioner operation, power is supplied normally through the first switch K1.

[0132] The N line is connected to the L line via the seventh resistor R7, the twelfth diode V12, and the seventh optocoupler B7, generating a zero-crossing detection signal that is output to the outdoor unit's main control circuit 3. Its principle is the same as that of the third optocoupler B3 in the indoor zero-crossing detection circuit. At this point, the outdoor unit's main control circuit 3 has completed its power connection, and normal communication between the indoor and outdoor control circuits can begin.

[0133] Reference Figure 13 and Figure 14 At this time, the indoor unit sends a communication command by controlling the on / off state of the first optocoupler B1 (high level 1 when on, low level 0 when off) based on the time point detected by the zero-crossing signal detection optocoupler B3. The outdoor unit receives the communication command sent by the indoor unit through the fifth optocoupler B5 and controls the relevant loads of the outdoor unit to start working according to the communication command.

[0134] The specific signal flow is as follows: Live wire L - Fifth resistor R5 - Third diode V3 - First optocoupler B1 - Second thermistor RT2 - First thermistor RT1 - Seventh optocoupler B7 - Eighth diode V8 - Fifth optocoupler B5 - Neutral wire N. This signal flow loop is the first loop 5.

[0135] Note that this circuit can only conduct in one direction, so it can only conduct when the voltage on the live wire L is high, which is commonly referred to as the positive half-cycle of the AC current. Therefore, it is necessary to detect the zero-crossing point of the AC current from negative to positive by the third optocoupler B3 before sending a communication signal.

[0136] Meanwhile, based on the zero-crossing signal detected by the sixth optocoupler B6, the outdoor unit sends a communication command by controlling the on / off state of the fourth optocoupler B4 (a high level 1 is sent when it is on, and a low level 0 is sent when it is off). The indoor unit receives the communication command sent by the second optocoupler B2 and controls the relevant loads of the indoor unit to adjust their working status according to the received communication command information.

[0137] The specific signal flow is as follows: Neutral line N - Sixth resistor R6 - Fifth diode V5 - Second optocoupler B2 - Second thermistor RT2 - First thermistor RT1 - Seventh optocoupler B7 - Tenth diode V10 - Fourth optocoupler B4 - Live wire L. This signal flow loop is the second loop 6.

[0138] Note that this circuit can only conduct in one direction, so it can only conduct when the voltage on the neutral line N is high, which is commonly referred to as the negative half-cycle of the AC current. Therefore, the optocoupler B4 needs to detect the zero-crossing point of the AC current from positive to negative before it can send a communication signal.

[0139] Compared to the commonly used current loop communication circuit, this design has a special advantage: the indoor and outdoor communication commands are transmitted and received independently and will not affect each other. For example, when a command is sent indoors, since the signal loop does not pass through the outdoor fourth optocoupler B4, it is not affected by whether the outdoor fourth optocoupler B4 is conducting.

[0140] Furthermore, indoor command transmission only conducts during the positive half-cycle of the AC power supply, while outdoor command transmission only conducts during the negative half-cycle. Therefore, even when sharing a single communication line SI, simultaneous indoor and outdoor signal transmissions can proceed without interference, allowing each signal to be transmitted independently (see reference). Figure 14 ).

[0141] At this point, the process of receiving the power-on command, powering on the outdoor unit controller, and entering normal communication between the indoor and outdoor controllers is complete.

[0142] When the indoor unit receives a user's shutdown command: the indoor unit sends a shutdown communication command via the first optocoupler B1. The outdoor unit, upon receiving the shutdown command via the fifth optocoupler B5, stops the operation of relevant outdoor loads (e.g., compressor, outdoor fan motor) and replies to the indoor unit via the fourth optocoupler B4. Upon receiving the reply, the indoor unit controls the first optocoupler B1 to close, and the communication circuit SI no longer outputs current to the outdoor unit. After waiting for a set time and confirming that no new commands are being sent from the indoor unit, the outdoor unit controls the fourth optocoupler B4 to close and simultaneously controls the first switch K1 to open, cutting off the power supply to the outdoor unit. At this time, since both the first and fourth optocouplers B1 and B4 are closed, there is no signal to control the seventh optocoupler B7 to conduct, therefore the first thyristor Q1 will not conduct, and all paths from the power supply to the outdoor control circuit are cut off. Thus, the outdoor unit completes the shutdown process and enters a power-off state, awaiting the next power-on operation.

[0143] In summary, some embodiments of this application provide an air conditioning system in which an indoor unit communication circuit 2 and an outdoor unit communication circuit 4 jointly construct a first loop and a second loop. The first loop is used by the indoor unit main control circuit to control the indoor unit to send signals to the outdoor unit, while the outdoor unit main control circuit can receive a first signal in the first loop. The second loop is used by the outdoor unit main control circuit to control the outdoor unit to send signals to the indoor unit, while the indoor unit main control circuit can receive a second signal in the second loop. In this way, the indoor unit can send signals to the outdoor unit at any time and will only receive control from the indoor unit main control circuit, independent of the outdoor unit; similarly, the outdoor unit can also send signals to the indoor unit at any time and will only receive control from the outdoor unit main control circuit, independent of the indoor unit; thus, indoor and outdoor communication can be carried out independently without affecting each other.

[0144] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes: Indoor unit, the indoor unit includes: Indoor unit main control circuit, An indoor unit communication circuit, wherein the control terminal of the indoor unit communication circuit is electrically connected to the signal transmitting terminal of the indoor unit main control circuit; The indoor unit's main control circuit is configured to control the operation of the indoor unit's communication circuit; An outdoor unit, which is electrically connected to the indoor unit; the outdoor unit includes: Outdoor unit main control circuit, The outdoor unit communication circuit has its control terminal electrically connected to the signal transmitting terminal of the outdoor unit main control circuit; the first terminal of the outdoor unit communication circuit is also electrically connected to the first terminal of the indoor unit communication circuit. The outdoor unit main control circuit is configured to control the operation of the outdoor unit communication circuit; The indoor unit communication circuit and the outdoor unit communication circuit include: a first circuit and a second circuit; The signal transmitting end of the indoor unit main control circuit sends a first control signal to enable the first circuit, and the outdoor unit main control circuit receives the first signal; the signal transmitting end of the outdoor unit main control circuit sends a second control signal to enable the second circuit, and the indoor unit main control circuit receives the second signal.

2. The air conditioning system according to claim 1, characterized in that, The indoor unit also includes: an indoor unit live wire terminal, an indoor unit neutral wire terminal, and an indoor unit communication terminal; The outdoor unit also includes: a connector, an outdoor unit live wire terminal, an outdoor unit neutral wire terminal, and an outdoor unit communication terminal; The input end of the connector is electrically connected to AC power, and the live wire output end of the connector is electrically connected to the live wire terminal of the indoor unit and also to the live wire terminal of the outdoor unit. The neutral output terminal of the connector is electrically connected to the neutral terminal of the indoor unit and also to the neutral terminal of the outdoor unit. The communication output terminal of the connector is electrically connected to the communication terminal block of the indoor unit and also electrically connected to the communication terminal block of the outdoor unit.

3. The air conditioning system according to claim 2, characterized in that, The outdoor unit also includes: The power control circuit has a first terminal electrically connected to the live wire terminal of the outdoor unit, a second terminal electrically connected to the output terminal of the first circuit, and a third terminal electrically connected to the outdoor power conversion module. When the first control signal is sent from the signal transmitting end of the indoor unit's main control circuit to make the first circuit conduct, the power control circuit is turned on, and the AC power charges the outdoor power conversion module.

4. The air conditioning system according to claim 3, characterized in that, The power control circuit includes: a first thyristor; The control terminal of the first thyristor is electrically connected to the second terminal of the power control circuit, the first terminal of the first thyristor is electrically connected to the first terminal of the power control circuit, and the second terminal of the first thyristor is electrically connected to the third terminal of the power control circuit.

5. The air conditioning system according to claim 4, characterized in that, The power control circuit further includes: a first switch; The control terminal of the first switch is electrically connected to the control terminal of the outdoor unit main control circuit, the first terminal of the first switch is electrically connected to the first terminal of the power control circuit, and the second terminal of the first switch is electrically connected to the input terminal of the outdoor power conversion module. The first switch is configured to be turned on when the outdoor unit's main control circuit is operating normally.

6. The air conditioning system according to claim 2, characterized in that, The indoor unit communication circuit includes: The first optocoupler has a first light-emitting end electrically connected to the control terminal of the indoor unit communication circuit, and a second light-emitting end electrically connected to the ground terminal; the first light-receiving end of the first optocoupler is electrically connected to the live wire terminal of the indoor unit, and the second light-receiving end of the first optocoupler is electrically connected to the communication terminal of the indoor unit. The second optocoupler has a first light-receiving end electrically connected to the first power supply end, and a second light-receiving end electrically connected to the first output end of the indoor unit communication circuit; the first light-emitting end of the second optocoupler is electrically connected to the neutral wire terminal of the indoor unit, and the second light-emitting end of the second optocoupler is electrically connected to the communication terminal of the indoor unit. The first output terminal of the indoor unit communication circuit is electrically connected to the signal receiving terminal of the indoor unit main control circuit. The first optocoupler is configured to turn on when it receives the first control signal.

7. The air conditioning system according to claim 6, characterized in that, The indoor unit communication circuit also includes: A first rectifier circuit, wherein the first terminal of the first rectifier circuit is electrically connected to the live wire terminal of the indoor unit; The third optocoupler has a first light-receiving end electrically connected to the first power supply end, and a second light-receiving end electrically connected to the second output end of the indoor unit communication circuit; the first light-emitting end of the third optocoupler is electrically connected to the second end of the first rectifier circuit, and the second light-emitting end of the third optocoupler is electrically connected to the neutral wire terminal of the indoor unit. The second output terminal of the indoor unit communication circuit is electrically connected to the zero-crossing signal receiving terminal of the indoor unit main control circuit. The indoor unit's main control circuit is configured to receive a zero-crossing signal when the third optocoupler is turned on.

8. The air conditioning system according to claim 2, characterized in that, The outdoor unit communication circuit includes: The fourth optocoupler has its first light-emitting end electrically connected to the control terminal of the outdoor unit's communication circuit, its second light-emitting end electrically connected to the ground terminal, and its second light-receiving end electrically connected to the outdoor unit's live wire terminal. The fifth optocoupler has its first light-receiving end electrically connected to the first power supply end, and its second light-receiving end electrically connected to the first output end of the outdoor unit communication circuit; the first light-emitting end of the fifth optocoupler is electrically connected to the first light-receiving end of the fourth optocoupler, and the second light-emitting end of the fifth optocoupler is electrically connected to the neutral wire terminal of the outdoor unit. The first output terminal of the outdoor unit communication circuit is electrically connected to the signal receiving terminal of the outdoor unit main control circuit. The fourth optocoupler is configured to turn on when the second control signal is received.

9. The air conditioning system according to claim 8, characterized in that, The outdoor unit communication circuit also includes: The second rectifier circuit, the first end of which is electrically connected to the neutral wire terminal of the outdoor unit; The sixth optocoupler has a first light-receiving end electrically connected to the first power supply end, and a second light-receiving end electrically connected to the second output end of the outdoor unit communication circuit; the first light-emitting end of the sixth optocoupler is electrically connected to the second end of the second rectifier circuit, and the second light-emitting end of the sixth optocoupler is electrically connected to the outdoor unit live wire terminal. The second output terminal of the outdoor unit communication circuit is electrically connected to the zero-crossing signal receiving terminal of the outdoor unit main control circuit. The outdoor unit's main control circuit is configured to receive a zero-crossing signal when the sixth optocoupler is turned on.

10. An air conditioning system, characterized in that, The air conditioning system includes: Indoor unit main control circuit, An indoor unit communication circuit, wherein the control terminal of the indoor unit communication circuit is electrically connected to the signal transmitting terminal of the indoor unit main control circuit; The indoor unit's main control circuit is configured to control the operation of the indoor unit's communication circuit; Outdoor unit main control circuit, The outdoor unit communication circuit has its control terminal electrically connected to the signal transmitting terminal of the outdoor unit main control circuit; the first terminal of the outdoor unit communication circuit is also electrically connected to the first terminal of the indoor unit communication circuit. The outdoor unit main control circuit is configured to control the operation of the outdoor unit communication circuit; The indoor unit communication circuit and the outdoor unit communication circuit include: a first circuit and a second circuit; The signal transmitting end of the indoor unit main control circuit sends a first control signal to enable the first circuit, and the outdoor unit main control circuit receives the first signal; the signal transmitting end of the outdoor unit main control circuit sends a second control signal to enable the second circuit, and the indoor unit main control circuit receives the second signal.

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