Air conditioner

Abstract

An air conditioner, comprising an indoor unit and an outdoor unit. The indoor unit comprises an indoor unit main control circuit and an indoor unit communication circuit. The outdoor unit comprises an outdoor unit main control circuit and an outdoor unit communication circuit. A first portion of the indoor unit communication circuit and a first portion of the outdoor unit communication circuit form a first loop. The outdoor unit main control circuit can receive a first signal transmitted by the first loop. A second portion of the indoor unit communication circuit and a second portion of the outdoor unit communication circuit form a second loop. The indoor unit main control circuit can receive a second signal transmitted by the second loop.

Description

Air conditioner

[0001] This application claims priority to Chinese Patent Application No. 202410703788.6, filed on May 31, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the field of air conditioning technology, and in particular, to an air conditioner. BACKGROUND

[0003] With the development of science and technology, the application of electrical appliances is becoming more and more common, and air conditioners have entered thousands of households. More and more people's daily life has been closely related to air conditioners. Air conditioners include indoor units and outdoor units. The indoor unit and the outdoor unit can communicate with each other to realize the functions of the air conditioner.

[0004] SUMMARY

[0005] The transmitting optocoupler and the receiving optocoupler in the communication circuit in the air conditioner are arranged in a series loop. When the indoor unit and the outdoor unit communicate with each other, the indoor controller and the outdoor controller need to be highly coordinated and must work at the same time, otherwise it is difficult to realize communication.

[0006] To solve the above problems, on the one hand, an air conditioner is provided. The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes an indoor unit communication circuit and an indoor unit main control circuit. The indoor unit main control circuit can control the operation of the indoor unit communication circuit. The control end of the indoor unit communication circuit is electrically connected to the signal sending end of the indoor unit main control circuit. The outdoor unit includes an outdoor unit main control circuit and an outdoor unit communication circuit. The outdoor unit main control circuit can control the operation of the outdoor unit communication circuit. The control end of the outdoor unit communication circuit is electrically connected to the signal sending end of the outdoor unit main control circuit, and the outdoor unit communication circuit is electrically connected to the indoor unit communication circuit.

[0007] The first part of the indoor unit communication circuit and the first part of the outdoor unit communication circuit constitute a first loop. The signal sending end of the indoor unit main control circuit can send a first control signal; the first control signal can control the first loop to be conductive in the positive half cycle of alternating current; the outdoor unit main control circuit can receive a first signal transmitted by the first loop; and the first signal can control the operation of the outdoor unit.

[0008] The second part of the indoor machine communication circuit and the second part of the outdoor machine communication circuit constitute a second loop. The signal sending end of the outdoor machine master control circuit can send a second control signal; the second control signal can control the second loop to be turned on in the negative half cycle of the alternating current; the indoor machine master control circuit can receive a second signal transmitted by the second loop; and the second signal can control the operation of the indoor machine.

[0009] In this way, the indoor machine can send signals to the outdoor machine at any time, and the process of the indoor machine sending signals to the outdoor machine is only controlled by the indoor machine master control circuit and is irrelevant to the outdoor machine. Similarly, the outdoor machine can also send signals to the indoor machine at any time, and the process of the outdoor machine sending signals to the indoor machine is only controlled by the outdoor machine master control circuit and is irrelevant to the indoor machine. In this way, the indoor machine to outdoor machine communication and the outdoor machine to indoor machine communication can be carried out independently and do not affect each other.

[0010] On the other hand, an air conditioner is provided. The air conditioner comprises an indoor machine communication circuit, an indoor machine communication circuit, an outdoor machine master control circuit and the outdoor machine communication circuit. The indoor machine master control circuit can control the operation of the indoor machine communication circuit. The control end of the indoor machine communication circuit is electrically connected with the signal sending end of the indoor machine master control circuit. The outdoor machine master control circuit can control the operation of the outdoor machine communication circuit. The control end of the outdoor machine communication circuit is electrically connected with the signal sending end of the outdoor machine master control circuit, and the outdoor machine communication circuit is electrically connected with the indoor machine communication circuit.

[0011] The first part of the indoor machine communication circuit and the first part of the outdoor machine communication circuit constitute a first loop. The signal sending end of the indoor machine master control circuit can send a first control signal; the first control signal can control the first loop to be turned on in the positive half cycle of the alternating current; the outdoor machine master control circuit can receive a first signal transmitted by the first loop; and the first signal can control the operation of the outdoor machine.

[0012] The second part of the indoor machine communication circuit and the second part of the outdoor machine communication circuit constitute a second loop. The signal sending end of the outdoor machine master control circuit can send a second control signal; the second control signal controls the second loop to be turned on in the negative half cycle of the alternating current; the indoor machine master control circuit can receive a second signal transmitted by the second loop; and the second signal can control the operation of the indoor machine.

[0013] In this way, the indoor unit communication circuit can send signals to the outdoor unit master control circuit at any time, and the process of the indoor unit communication circuit sending signals to the outdoor unit master control circuit will only be controlled by the indoor unit master control circuit, and is irrelevant to the outdoor unit master control circuit; similarly, the outdoor unit communication circuit can send signals to the indoor unit master control circuit at any time, and the process of the outdoor unit communication circuit sending signals to the indoor unit master control circuit will only be controlled by the outdoor unit master control circuit, and is irrelevant to the indoor unit master control circuit. In this way, indoor-to-outdoor communication and outdoor-to-indoor communication can be carried out independently and do not affect each other. BRIEF DESCRIPTION OF DRAWINGS

[0014] FIG. 1 is a schematic diagram of an air conditioner according to some embodiments;

[0015] FIG. 2 is a block diagram of an air conditioner according to some embodiments;

[0016] FIG. 3 is a block diagram of an indoor unit and a connector according to some embodiments;

[0017] FIG. 4 is a block diagram of another air conditioner according to some embodiments;

[0018] FIG. 5 is a block diagram of yet another air conditioner according to some embodiments;

[0019] FIG. 6 is a block diagram of yet another air conditioner according to some embodiments;

[0020] FIG. 7 is a circuit diagram of an indoor unit and an outdoor unit according to some embodiments;

[0021] FIG. 8 is another circuit diagram of an indoor unit and an outdoor unit according to some embodiments;

[0022] FIG. 9 is a circuit diagram of a power control circuit according to some embodiments;

[0023] FIG. 10 is yet another circuit diagram of an indoor unit and an outdoor unit according to some embodiments;

[0024] FIG. 11 is a circuit diagram of an indoor unit according to some embodiments;

[0025] FIG. 12 is a circuit diagram of an outdoor unit according to some embodiments;

[0026] FIG. 13 is yet another circuit diagram of an indoor unit and an outdoor unit according to some embodiments;

[0027] FIG. 14 is a timing diagram of operation of an air conditioner according to some embodiments. DETAILED DESCRIPTION

[0028] The embodiments of the present disclosure will be described clearly and completely with reference to the drawings, obviously, the described embodiments are only part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by those skilled in the art belong to the scope protected by the present disclosure.

[0029] Unless otherwise required by context, the term "comprise" and its other forms such as "comprises" and "comprising" are to be construed as open, inclusive, meaning that "comprising" means "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to mean that a particular feature, structure, material or characteristic included in at least one embodiment or example of the present disclosure. The illustrative representation of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or characteristics described can be included in any one or more embodiments or examples in any appropriate manner.

[0030] Hereinafter, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0031] In describing some embodiments, "coupled" and "connected" and their derivatives can be used. The term "connected" should be understood broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrated; can be directly connected, or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components have direct physical or electrical contact. The term "coupled" or "communicatively coupled" can also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0032] "A, B, and C at least one of" has the same meaning as "at least one of A, B, or C," each including the following combinations: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0033] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0034] As used herein, the term "if' is, optionally, interpreted as meaning "when" or "while" or "in response to a determination" or "in response to a detection of. Similarly, the phrase "if determined," or "if detected [a stated condition or event]" is, optionally, interpreted as meaning "upon a determination of" or "in response to a determination of" or "upon a detection of [a stated condition or event]" or "in response to a detection of [a stated condition or event]."

[0035] The use of "adapted to" or "configured to" herein means open and inclusive language that does not exclude devices that are adapted to or configured to perform additional tasks or steps.

[0036] As used herein, "about," "approximately," or "around" includes the recited value and the average value within an acceptable range of deviation from the particular value, as determined by one of ordinary skill in the art considering the measurement being discussed and the error in measurement associated with the particular quantity being measured (i.e., the limitations of the measurement system).

[0037] Generally, an air conditioner includes a communication circuit to enable communication between an indoor unit and an outdoor unit. However, all the transmitting optocouplers and receiving optocouplers in the communication circuit are arranged in a series loop, so that when the indoor unit and the outdoor unit communicate with each other, the indoor controller and the outdoor controller need to be highly coordinated and must work at the same time, otherwise it is difficult to achieve communication. For example, when the indoor unit sends a communication command to the outdoor unit, the optocoupler that transmits the communication command in the outdoor unit must be turned on, otherwise the loop will be broken; similarly, when the outdoor unit sends a communication command to the indoor unit, the optocoupler that transmits the communication command in the indoor unit must be turned on, which increases the complexity of communication between the indoor unit and the outdoor unit.

[0038] To solve the above problems, some embodiments of the present disclosure provide an air conditioner 1000. The air conditioner 1000 constructs a first loop 5 and a second loop 6 through an indoor unit communication circuit 2 and an outdoor unit communication circuit 4. The indoor unit 100 can send a first control signal to control the first loop 5 to be turned on in the positive half cycle of the alternating current, so as to power on the outdoor unit 200. The outdoor unit main control circuit 1 can receive the first signal through the first loop 5 to control the operation of the related load of the outdoor unit 200. The outdoor unit 200 can send a second control signal to control the second loop 6 to be turned on in the negative half cycle of the alternating current, and the indoor unit main control circuit 1 can receive the second signal through the second loop 6 to control the operation of the related load of the indoor unit 100.

[0039] In this way, the indoor unit 100 sends the first signal to the outdoor unit 200, and the outdoor unit 200 sends the second signal to the indoor unit 100, which can be performed independently and without affecting each other, thereby reducing the complexity of communication between the indoor unit and the outdoor unit.

[0040] As shown in FIG. 1, the air conditioner 1000 includes an indoor unit 100. The indoor unit 100 can be arranged indoors. The air conditioner 1000 further includes an outdoor unit 200, which can be arranged outdoors. The indoor unit 100 and the outdoor unit 200 work together to realize various functions of the air conditioner 1000. It should be noted that the air conditioner 1000 can be a split-type or an integrated air conditioner.

[0041] As shown in FIG. 2, the air conditioner 1000 further includes a connector 300. The input end of the connector 300 is electrically connected to the alternating current, and the output end of the connector 300 is electrically connected to the outdoor unit 200 and the indoor unit 100, so that the connector 300 can supply power to the outdoor unit 200 and the indoor unit 100. Here, the alternating current is generally the mains, that is, 220V. The live wire of the alternating current is electrically connected to the live wire input end of the connector 300, and the zero line of the alternating current is electrically connected to the zero line input end of the connector 300.

[0042] It should be noted that the connector 300 is arranged outside the outdoor unit 200 and the indoor unit 100 in FIG. 2 as an example for description. Of course, in some embodiments, the connector 300 can also be arranged at other positions, for example, the connector 300 is arranged in the outdoor unit 200, or the connector 300 is arranged in the indoor unit 100.

[0043] The foregoing describes the connector 300 as an integral part as an example for description. Of course, in some embodiments, the connector 300 can be a split part. The first part of the connector 300 is arranged in the indoor unit 100, and the second part of the connector 300 is arranged in the outdoor unit 200.

[0044] As shown in FIG. 2, the connector 300 is provided with a live wire L, a zero wire N and a communication wire SI. The indoor unit 100 is connected with the outdoor unit 200 through the live wire L, the zero wire N and the communication wire SI.

[0045] In some embodiments, as shown in FIG. 3, the indoor unit 100 comprises an indoor unit master control circuit 1. The indoor unit 100 further comprises an indoor unit communication circuit 2. A control end 201 of the indoor unit communication circuit 2 is electrically connected with a signal sending end 101 of the indoor unit master control circuit 1. The indoor unit master control circuit 1 is configured to control the operation of the indoor unit communication circuit 2.

[0046] In some embodiments, as shown in FIG. 4, the outdoor unit 200 comprises an outdoor unit master control circuit 3. The outdoor unit 200 further comprises an outdoor unit communication circuit 4. A control end 401 of the outdoor unit communication circuit 4 is electrically connected with a signal sending end 301 of the outdoor unit master control circuit 3; a first end 402 of the outdoor unit communication circuit 4 is electrically connected with a first end 202 of the indoor unit communication circuit 2. The outdoor unit master control circuit 3 is configured to control the operation of the outdoor unit communication circuit 4.

[0047] In some embodiments, as shown in FIG. 5, the indoor unit 100 further comprises an indoor power conversion component 31. A first end of the indoor power conversion component 31 is electrically connected with the connector 300, and a second end of the indoor power conversion component 31 is electrically connected with the indoor unit master control circuit 1. The indoor power conversion component 31 is configured to supply power to the indoor unit master control circuit 1.

[0048] In some embodiments, as shown in FIG. 5, the outdoor unit 200 further comprises an outdoor power conversion component 32. A first end of the outdoor power conversion component 32 is electrically connected with the connector 300, and a second end of the outdoor power conversion component 32 is electrically connected with the outdoor unit master control circuit 3. The outdoor power conversion component 32 is configured to supply power to the outdoor unit master control circuit 3.

[0049] As shown in FIG. 6, a first part of the indoor unit communication circuit 2 and a first part of the outdoor unit communication circuit 4 constitute a first loop 5. A second part of the indoor unit communication circuit 2 and a second part of the outdoor unit communication circuit 4 constitute a second loop 6.

[0050] It should be noted that the first loop 5 and the second loop 6 can comprise the same partial loop.

[0051] It can be understood that the indoor unit communication circuit 2 and the outdoor unit communication circuit 4 are electrically connected, and the circuits in the indoor unit communication circuit 2 and the circuits in the outdoor unit communication circuit 4 jointly constitute the first loop 5 and the second loop 6.

[0052] The signal sending end 101 of the indoor master control circuit 1 is configured to send a first control signal to control the first loop 5 to be turned on in the positive half cycle of the alternating current. For example, the first control signal is a continuous high level signal to make the first loop 5 turned on.

[0053] The signal sending end 101 of the indoor master control circuit 1 is further configured to send a first signal after the first loop 5 is turned on, and the outdoor master control circuit 3 receives the first signal transmitted by the turned-on first loop 5. The first signal is configured to control the operation of the outdoor unit 200. For example, the first signal can control the operation of the compressor, fan, etc. in the outdoor unit 200.

[0054] The signal sending end 301 of the outdoor master control circuit 3 is configured to send a second control signal to control the second loop 6 to be turned on in the negative half cycle of the alternating current. For example, the second control signal is a continuous high level signal to make the second loop 6 turned on. The signal sending end 301 of the outdoor master control circuit 3 is further configured to send a second signal after the second loop 6 is turned on, and the indoor master control circuit 1 can receive the second signal transmitted by the turned-on second loop 6. The second signal is configured to control the operation of the indoor unit 100.

[0055] It should be noted that the foregoing is described by taking the example that the first loop 5 is turned on in the positive half cycle of the alternating current and the second loop 6 is turned on in the negative half cycle of the alternating current. Of course, in some embodiments, the first loop 5 is turned on in the negative half cycle of the alternating current and the second loop 6 is turned on in the positive half cycle of the alternating current.

[0056] Since the first loop 5 and the second loop 6 are two separate loops, any one of the loops can be turned on under the control of the corresponding indoor master control circuit 1 or outdoor master control circuit 3.

[0057] If the indoor unit 100 needs to send a signal to the outdoor unit 200, the signal sending end 101 of the indoor master control circuit 1 sends a first control signal to the indoor communication circuit 2 to make the first loop 5 turned on, and the outdoor master control circuit 3 receives the first signal transmitted by the first loop 5, thereby completing the communication from the indoor unit 100 to the outdoor unit 200.

[0058] Similarly, if the outdoor unit 200 needs to send a signal to the indoor unit 100, the signal sending end 301 of the outdoor master control circuit 3 sends a second control signal to the outdoor communication circuit 4 to make the second loop 6 turned on, and the indoor master control circuit 1 receives the second signal transmitted by the second loop 6, thereby completing the communication from the outdoor unit 200 to the indoor unit 100.

[0059] Some embodiments of the present disclosure provide an air conditioner 1000, which is configured with a first loop 5 and a second loop 6 by an indoor unit communication circuit 2 and an outdoor unit communication circuit 4. The indoor unit main control circuit 1 sends a first signal to the outdoor unit 200 through the first loop 5, and the outdoor unit main control circuit 3 can receive the first signal through the first loop 5. The first loop 5 is turned on in the positive half cycle of the alternating current. The outdoor unit main control circuit 3 sends a second signal to the indoor unit 100 through the second loop 6, and the indoor unit main control circuit 1 can receive the second signal through the second loop 6. The second loop 6 is turned on in the negative half cycle of the alternating current.

[0060] In this way, the indoor unit 100 can send signals to the outdoor unit 200 at any time, and the process of the indoor unit 100 sending signals to the outdoor unit 200 is only controlled by the indoor unit main control circuit 1, and is irrelevant to the outdoor unit 200; similarly, the outdoor unit 200 can also send signals to the indoor unit 100 at any time, and the process of the outdoor unit 200 sending signals to the indoor unit 100 is only controlled by the outdoor unit main control circuit 3, and is irrelevant to the indoor unit 100. In this way, the communication of the indoor unit 100 to the outdoor unit 200 and the communication of the outdoor unit 200 to the indoor unit 100 can be carried out independently and do not affect each other.

[0061] In some embodiments, as shown in FIGS. 7 and 8, the indoor unit 100 further comprises an indoor unit live wire terminal 7L; the indoor unit 100 further comprises an indoor unit zero line terminal 7N; and the indoor unit 100 further comprises an indoor unit communication terminal 7SI.

[0062] As shown in FIGS. 7 and 8, the outdoor unit 200 further comprises an outdoor unit live wire terminal 8L; the outdoor unit 200 further comprises an outdoor unit zero line terminal 8N; and the outdoor unit 200 further comprises an outdoor unit communication terminal 8SI.

[0063] As shown in FIGS. 7 and 8, the connector 300 comprises a first connector 8. The first connector 8 is arranged in the outdoor unit 200. The input end of the first connector 8 is electrically connected with the alternating current, the live wire output end L-1N of the first connector 8 is electrically connected with the indoor unit live wire terminal 7L, and the live wire output end L-1N of the first connector 8 is also electrically connected with the outdoor unit live wire terminal 8L. The zero line output end N-1N of the first connector 8 is electrically connected with the indoor unit zero line terminal 7N, and the zero line output end N-1N of the first connector 8 is also electrically connected with the outdoor unit zero line terminal 8N. The communication output end S1 of the first connector 8 is electrically connected with the indoor unit communication terminal 7SI, and the communication output end S1 of the first connector 8 is also electrically connected with the outdoor unit communication terminal 8SI.

[0064] In some embodiments, as shown in FIG. 7 and FIG. 8, the connector 300 further comprises a second connector 7. The second connector 7 is arranged in the indoor unit 100. The live wire output end L-1N of the second connector 7 is electrically connected with the indoor unit live wire terminal 7L and the live wire output end L-1N of the first connector 8. The zero wire output end N-1N of the second connector 7 is electrically connected with the indoor unit zero wire terminal 7N and the zero wire output end N-1N of the first connector 8. The communication output end S1 of the second connector 7 is electrically connected with the indoor unit communication terminal 7SI and the communication output end S1 of the first connector 8. In this way, the first connector 8 is electrically connected with the second connector 7, and the second connector 7 is further electrically connected with the indoor unit live wire terminal 7L, the indoor unit zero wire terminal 7N and the indoor unit communication terminal 7SI, thereby realizing the communication connection between the outdoor unit 200 and the indoor unit 100.

[0065] In the case that the connector 300 comprises the second connector 7, the input end of the indoor power conversion component 31 is electrically connected with the indoor unit live wire terminal 8L and the indoor unit zero wire terminal 8N, and the output end of the indoor power conversion component 31 is electrically connected with the indoor unit main control circuit 1.

[0066] In some embodiments, the connector 300 (e.g., the first connector 8 and the second connector 8) comprises a terminal row.

[0067] In the related art, an air conditioner comprises a power control circuit, which is mainly used for controlling the power supply line to supply power to the outdoor unit. The power control circuit needs to control the switch of the power supply, which can be an electromagnetic relay, or an optocoupler triac, a solid-state relay, etc. However, no matter what form the switch is, the required driving current is large, for example, the driving current needs to reach more than 10 mA. In this way, the energy consumption of the air conditioner is increased, and it is difficult to promote the air conditioner product.

[0068] In order to solve the above problems, as shown in FIG. 9, FIG. 10 and FIG. 13, the outdoor unit 200 further comprises a power control circuit 9. The first end of the power control circuit 9 is electrically connected with the outdoor unit live wire terminal 8L, the second end of the power control circuit 9 is electrically connected with the output end of the first loop 5, and the third end of the power control circuit 9 is electrically connected with the outdoor power conversion component 32.

[0069] It should be noted that the light receiving end of the first optocoupler B7 (which will be described below) is roughly equivalent to the output end of the first loop 5.

[0070] As shown in FIG. 9, FIG. 10 and FIG. 13, the power control circuit 9 comprises a thyristor Q1. The control end of the thyristor Q1 is electrically connected with the second end of the power control circuit 9, the first end of the thyristor Q1 is electrically connected with the first end of the power control circuit 9, and the second end of the thyristor Q1 is electrically connected with the third end of the power control circuit 9.

[0071] It should be noted that the thyristor is also called Silicon Controlled Rectifier (SCR), which is an important semiconductor switching element, widely used in power electronics and industrial control systems. It is composed of three PN junctions, with anode, cathode and gate. The basic working principle of thyristor is to control the conduction of thyristor by applying a forward bias voltage to the gate, so as to realize the control of current.

[0072] When the thyristor is turned on, a positive trigger current needs to be applied to the gate of the thyristor. This trigger current is usually a pulse signal, and the width and amplitude of the pulse signal need to be large enough to ensure that the anode current reaches the minimum value required to maintain the conduction of the thyristor.

[0073] In this way, the thyristor only needs a trigger signal to turn on, and will be turned off until the next zero-crossing signal appears, which can reduce power consumption. Moreover, the driving current used by the thyristor is small, and the thyristor is intermittently turned on and off, which can further reduce power consumption. The zero-crossing signal can refer to the control signal corresponding to the time when the alternating current changes from positive voltage to negative voltage, or from negative voltage to positive voltage.

[0074] As shown in FIGS. 9, 10 and 13, the power supply control circuit 9 further comprises a switch K1 (e.g., a relay). The control end of the switch K1 is electrically connected with the control end of the outdoor main control circuit 3, the first end of the switch K1 is electrically connected with the first end of the power supply control circuit 9, and the second end of the switch K1 is electrically connected with the input end of the outdoor power conversion component 32. The switch K1 is configured to be turned on when the outdoor main control circuit 3 is working normally.

[0075] It should be noted that when the time for the alternating current to supply power to the outdoor main control circuit 3 through the thyristor Q1 exceeds the predetermined time length, and the waveform of the alternating current is continuous, the outdoor power conversion component 32 can stably supply power to the outdoor main control circuit 3, at this time, it indicates that the outdoor main control circuit 3 is working normally.

[0076] As shown in FIGS. 9, 10 and 13, the power supply control circuit 9 further comprises a first resistor R8, which functions as a current limiting resistor. The first end of the first resistor R8 is electrically connected with the first end of the thyristor Q1. The second end of the first resistor R8 is electrically connected with the output end of the first loop 5.

[0077] In some embodiments, the first resistor R8 also functions as a bias resistor.

[0078] As shown in FIG. 9, FIG. 10 and FIG. 13, the power control circuit 9 further comprises a third thermistor RT3 (thermistor). A first end of the third thermistor RT3 is electrically connected with the outdoor unit live terminal 8L, a second end of the third thermistor RT3 is electrically connected with a first end of the first resistor R8, and the second end of the third thermistor RT3 is also electrically connected with a first end of the thyristor Q1.

[0079] As shown in FIG. 13, the power control circuit 9 further comprises a second resistor R9. The second resistor R9 has the functions of bias resistor and current limiting resistor. A first end of the second resistor R9 is electrically connected with the control end of the thyristor Q1, and a second end of the second resistor R9 is electrically connected with a second end of the thyristor Q1.

[0080] In some embodiments, the second resistor R9 is a bias resistor for the control end (e.g. gate G) of the thyristor Q1, so that the thyristor Q1 can form a trigger level loop when receiving a trigger signal. Here, the trigger level can refer to a preset voltage value or current value, when the input signal reaches the preset value, the circuit will produce a specific response, for example, change the output state.

[0081] In some embodiments, as shown in FIG. 13, the outdoor unit communication circuit 4 comprises a first thermistor RT1. It should be noted that the first thermistor RT1 and the third thermistor RT3 are both positive temperature coefficient thermistors (PTC), which refers to semiconductor materials or components with large positive temperature coefficient. The positive temperature coefficient thermistor is a typical semiconductor resistor with temperature sensitivity, when the temperature exceeds a preset temperature (Curie temperature), the resistance value of the positive temperature coefficient thermistor increases step by step with the increase of temperature.

[0082] As shown in FIG. 13, the outdoor unit communication circuit 4 further comprises a first optocoupler B7. A first light emitting end of the first optocoupler B7 is electrically connected with the outdoor unit communication terminal 8SI via the first thermistor RT1, a second light emitting end of the first optocoupler B7 is connected with the outdoor unit live terminal 8L, a first light receiving end of the first optocoupler B7 is electrically connected with a second end of the first resistor R8, a second light receiving end of the first optocoupler B7 is electrically connected with a first end of the second resistor R9, and the second light receiving end of the first optocoupler B7 is also electrically connected with the control end of the thyristor Q1.

[0083] In some embodiments, the first optocoupler B7 comprises an optocoupler thyristor.

[0084] Opto-triac is a special optoelectronic coupling device that converts input optical signals into output control electrical signals to control and regulate high-power equipment. This device is mainly composed of a light source, a photoelectric conversion element, and a triac, with characteristics such as high voltage resistance, high temperature resistance, and high response speed, and can achieve optical and electrical isolation and electrical control functions. Opto-triac is widely used in various fields, including industrial control, power electronics, medical devices, automotive electronics, and communication equipment.

[0085] When the signal sending end 101 of the indoor master control circuit 1 sends the first control signal to make the first loop 5 conductive, the first opto-coupler B7 is turned on, making the thyristor Q1 conductive, and the power supply control circuit 9 is turned on. In this way, the alternating current power supply can charge the outdoor power conversion component 32 through the conductive power supply control circuit 9.

[0086] Here, the first opto-coupler B7 can be used to receive signals from the communication line to control the thyristor Q1 to conduct. When the conductive signal sent by the indoor master control circuit 1 is transmitted to the first opto-coupler B7, the first opto-coupler B7 controls the thyristor Q1 to conduct.

[0087] As shown in FIGS. 9, 10, and 13, the thyristor Q1 is connected in series with the third thermistor RT3 between the live wire L and the outdoor power conversion component 32. In this way, when the thyristor Q1 is conductive, the power supply live wire L is conductive through the third thermistor RT3, the thyristor Q1, and the outdoor power conversion component 32, and the outdoor power conversion component 32 is conductive with the power supply neutral wire N, so that the outdoor power conversion component 32 can be powered.

[0088] When the outdoor power conversion component 32 can stably power the outdoor master control circuit 3, the outdoor master control circuit 3 controls the switch K1 to close, making the loop where the third thermistor RT3 and the thyristor Q1 are located short-circuit, and the alternating current directly charges the outdoor power conversion component 32 through the loop where the switch K1 is located.

[0089] Here, when the duration of the power supply of the outdoor power conversion component 32 to the outdoor master control circuit 3 exceeds the preset duration, and the waveform of the power supply alternating current is continuous, the outdoor power conversion component 32 stably powers the outdoor master control circuit 3.

[0090] In some embodiments, as shown in FIG. 11, the indoor unit communication circuit 2 comprises a second optocoupler B1. The first light-emitting end of the second optocoupler B1 is electrically connected to the control end of the indoor unit communication circuit 2, and the control end of the indoor unit communication circuit 2 is connected to the signal transmitting end 101 of the indoor unit main control circuit 1; the second light-emitting end of the second optocoupler B1 is electrically connected to the ground end. The first light-receiving end of the second optocoupler B1 is electrically connected to the indoor unit live terminal 7L, and the second light-receiving end of the second optocoupler B1 is electrically connected to the indoor unit communication terminal 7SI. The second optocoupler B1 is configured to be turned on when receiving the first control signal transmitted by the signal transmitting end of the indoor unit main control circuit 1. The second optocoupler B1 can be turned on during the positive half cycle of the alternating current.

[0091] As shown in FIG. 11, the indoor unit communication circuit 2 further comprises a third optocoupler B2. The first light-receiving end of the third optocoupler B2 is electrically connected to the power supply end, the second light-receiving end of the third optocoupler B2 is electrically connected to the first output end of the indoor unit communication circuit 2, and the first output end of the indoor unit communication circuit 2 is electrically connected to the signal receiving end of the indoor unit main control circuit 1. The first light-emitting end of the third optocoupler B2 is electrically connected to the indoor unit neutral terminal 7N, and the second light-emitting end of the third optocoupler B2 is electrically connected to the indoor unit communication terminal 7SI. The third optocoupler B2 can be turned on during the negative half cycle of the alternating current.

[0092] In some embodiments, the voltage of the power supply end is 5V.

[0093] As shown in FIG. 11, the indoor unit communication circuit 2 further comprises a first rectifier circuit. The first end of the first rectifier circuit is electrically connected to the indoor unit live terminal 7L.

[0094] For example, the first rectifier circuit comprises a third resistor R1, and the first end of the third resistor R1 is electrically connected to the indoor unit live terminal 7L. The third resistor R1 has the functions of voltage division and current limiting. The first rectifier circuit further comprises a first diode V1. The anode of the first diode V1 is electrically connected to the second end of the third resistor R1. The first diode V1 has the functions of half-wave rectification and preventing reverse conduction.

[0095] As shown in FIG. 11, the indoor unit communication circuit 2 further comprises a fourth optocoupler B3. The first light-receiving end of the fourth optocoupler B3 is electrically connected to the power supply end, the second light-receiving end of the fourth optocoupler B3 is electrically connected to the second output end of the indoor unit communication circuit 2, and the second output end of the indoor unit communication circuit 2 is electrically connected to the zero-crossing signal receiving end of the indoor unit main control circuit 1. The first light-emitting end of the fourth optocoupler B3 is electrically connected to the second end (such as the cathode of the first diode V1) of the first rectifier circuit, and the second light-emitting end of the fourth optocoupler B3 is electrically connected to the indoor unit neutral terminal 7N. The fourth optocoupler B3 has the function of detecting the zero-crossing signal of the alternating current.

[0096] In this case, the indoor unit main control circuit 1 is further configured to receive the zero-crossing signal when the fourth optocoupler B3 is turned on.

[0097] In some embodiments, the fourth optocoupler B3 is turned on when the AC power is in the positive half cycle and the voltage rises above the turn-on voltage of the fourth optocoupler B3 after zero crossing, so that the indoor unit main control circuit 1 receives the zero-crossing signal, and the signal transmitting end 101 of the indoor unit main control circuit 1 sends the first signal and the first control signal.

[0098] In some embodiments, as shown in FIG. 11, the indoor unit communication circuit 2 further includes a second thermistor RT2. The second thermistor RT2 has the function of voltage reduction and current limiting. Like the first thermistor RT1 and the third thermistor RT3, the second thermistor RT2 is a positive temperature coefficient thermistor.

[0099] In some embodiments, as shown in FIG. 12, the outdoor unit communication circuit 4 includes a fifth optocoupler B4. The first light-emitting end of the fifth optocoupler B4 is electrically connected to the control end of the outdoor unit communication circuit 4, and the control end of the outdoor unit communication circuit 4 is connected to the signal transmitting end of the outdoor unit main control circuit 3; the second light-emitting end of the fifth optocoupler B4 is electrically connected to the ground. The first light-receiving end of the fifth optocoupler B4 is electrically connected to the first optocoupler B7, and the second light-receiving end of the fifth optocoupler B4 is electrically connected to the outdoor unit live wire terminal 8L. The fifth optocoupler B4 is configured to be turned on when receiving the second control signal, and the fifth optocoupler B4 can be turned on in the negative half cycle of the AC power.

[0100] As shown in FIG. 12, the outdoor unit communication circuit 4 further includes a sixth optocoupler B5. The first light-receiving end of the sixth optocoupler B5 is electrically connected to the power supply end, and the second light-receiving end of the sixth optocoupler B5 is electrically connected to the first output end of the outdoor unit communication circuit 4, and the first output end of the outdoor unit communication circuit 4 is electrically connected to the signal receiving end of the outdoor unit main control circuit 3. The first light-emitting end of the sixth optocoupler B5 is electrically connected to the first light-receiving end of the fifth optocoupler B4, and the first light-emitting end of the sixth optocoupler B5 is also electrically connected to the second light-emitting end of the first optocoupler B7 and the outdoor unit communication line terminal 8SI. The second light-emitting end of the sixth optocoupler B5 is electrically connected to the outdoor unit zero line terminal 8N. The sixth optocoupler B5 can be turned on in the positive half cycle of the AC power.

[0101] In some embodiments, as shown in FIG. 12, the outdoor unit communication circuit 4 further includes a second rectifier circuit. The first end of the second rectifier circuit is electrically connected to the outdoor unit zero line terminal 8N. For example, the second rectifier circuit includes a fourth resistor R7, and the first end of the fourth resistor R7 is electrically connected to the outdoor unit zero line terminal 8N. The second rectifier circuit further includes a second diode V12. The anode of the second diode V12 is electrically connected to the second end of the fourth resistor R7. The fourth resistor R7 has the function of voltage reduction and current limiting.

[0102] The outdoor unit communication circuit 4 further comprises a seventh optocoupler B6. The first light-receiving end of the seventh optocoupler B6 is electrically connected to the power supply end, the second light-receiving end of the seventh optocoupler B6 is electrically connected to the second output end of the outdoor unit communication circuit 4, and the second output end of the outdoor unit communication circuit 4 is electrically connected to the zero-crossing signal receiving end of the outdoor unit main control circuit 3; the first light-emitting end of the seventh optocoupler B6 is electrically connected to the second end (e.g., the cathode of the second diode V12) of the second rectifier circuit, and the second light-emitting end of the seventh optocoupler B6 is electrically connected to the outdoor unit live terminal 8L.

[0103] In this case, the outdoor unit main control circuit 3 is further configured to receive the zero-crossing signal when the seventh optocoupler B6 is turned on.

[0104] In some embodiments, the seventh optocoupler B6 is turned on when the AC voltage is in the negative half cycle and the voltage amplitude rises to exceed the turn-on voltage of the seventh optocoupler B6 after the voltage crosses zero, so that the outdoor unit main control circuit 3 receives the zero-crossing signal, and the signal transmitting end 301 of the outdoor unit main control circuit 3 sends the second signal and the second control signal.

[0105] As shown in FIG. 13, the AC power is input to the first connector 8 via the power supply line, the ground wire GND is the protective ground circuit, the power supply live wire L (i.e., the live wire L mentioned above) and the power supply neutral wire N (i.e., the neutral wire N mentioned above) are the power supply circuits, and the live wire L and the neutral wire N are connected to the outdoor unit 200 and the indoor unit 100, respectively, after being connected to the connector 300. For example, for the part of the live wire L or the neutral wire connected to the outdoor unit 200, the live wire L is connected to the outdoor unit live terminal 8L, and the neutral wire N is connected to the outdoor unit neutral terminal 8N.

[0106] When the air conditioner 1000 is in standby mode and stops working, the outdoor unit main control circuit 3 is powered off, at which time the switch K1 and the thyristor Q1 are disconnected, so that the power supply of the outdoor unit 200 is completely disconnected, and standby power consumption can be avoided. In addition, the communication line SI is connected to the outdoor unit communication terminal 8SI in the outdoor unit 200 and to the indoor unit communication terminal 7SI in the indoor unit 100. When the air conditioner 1000 is running, the indoor unit 100 and the outdoor unit 200 transmit running information through the communication line SI.

[0107] It should be noted that the power supply is connected to the first connector 8 through the live wire output end L-IN and the zero wire output end N-IN of the first connector 8. And the live wire L is connected to the indoor unit live wire terminal 7L, the zero wire N is connected to the indoor unit zero wire terminal 7N, and the live wire L and the zero wire N are connected to the indoor power conversion component 31 after being connected to the indoor unit 100. The indoor power conversion component 31 can convert alternating high voltage (for example, alternating current (AC) 220V / 50HZ) into direct low voltage (for example, direct current (DC) 5V or 12V), and provide the direct low voltage to the indoor unit main control circuit 1.

[0108] In addition, the live wire L and the zero wire N form an alternating current zero-crossing detection circuit through the first rectifier circuit and the fourth optocoupler B3. In the first rectifier circuit, the third resistor R1 has the function of voltage reduction and current limiting, and the first diode V1 has the function of half-wave rectification. The fourth optocoupler B3 can detect the alternating current zero-crossing signal (i.e., the control signal corresponding to the time when the alternating current changes from positive voltage to negative voltage, or from negative voltage to positive voltage), and send the detection result to the indoor unit main control circuit 1.

[0109] In some embodiments, as shown in FIG. 13, the indoor unit communication circuit 2 further includes a seventh resistor R2; and the indoor unit communication circuit 2 further includes a tenth diode V2. The seventh resistor R2 and the tenth diode V2 have the function of clamping the light-emitting end (such as the first light-emitting end and the second light-emitting end) of the fourth optocoupler B3.

[0110] In some embodiments, the second optocoupler B1, the third optocoupler B2, the fifth optocoupler B4, and the sixth optocoupler B5 respectively have the functions of signal transmission and electrical isolation. It can be understood that the second optocoupler B1 corresponds to the signal transmitting end of the indoor unit main control circuit 1, the third optocoupler B2 corresponds to the signal receiving end of the indoor unit main control circuit 1, the fifth optocoupler B4 corresponds to the signal transmitting end of the outdoor unit main control circuit 3, and the sixth optocoupler B5 corresponds to the signal receiving end of the outdoor unit main control circuit 3.

[0111] In some embodiments, as shown in FIG. 13, the indoor unit communication circuit 2 further includes a third diode V3; the indoor unit communication circuit 2 further includes a fourth diode V4; the indoor unit communication circuit 2 further includes a fifth diode V5; and the indoor unit communication circuit 2 further includes a sixth diode V6.

[0112] The outdoor unit communication circuit 4 further includes a seventh diode V7; the outdoor unit communication circuit 4 further includes an eighth diode V8; the outdoor unit communication circuit 4 further includes a ninth diode V9; the outdoor unit communication circuit 4 further includes a twelfth diode V10; the outdoor unit communication circuit 4 further includes an eleventh diode V11; and the outdoor unit communication circuit 4 further includes a thirteenth diode V13.

[0113] The cathode of the seventh diode V7 is electrically connected with the terminal 8SI of the communication line of the outdoor unit and the first light emitting end of the first optocoupler B7, and the anode of the seventh diode V7 is electrically connected with the anode of the eighth diode V8 and the second light emitting end of the first optocoupler B7; the cathode of the eighth diode V8 is electrically connected with the first light emitting end of the sixth optocoupler B5 and the cathode of the ninth diode V9; the anode of the ninth diode V9 is electrically connected with the second light emitting end of the sixth optocoupler B5 and the terminal 8N of the zero line of the outdoor unit; the anode of the twelfth diode V10 is electrically connected with the anode of the seventh diode V7, the second light emitting end of the first optocoupler B7 and the anode of the eighth diode V8, and the cathode of the twelfth diode V10 is electrically connected with the cathode of the eleventh diode V11 and the first light receiving end of the fifth optocoupler B4, and the anode of the eleventh diode V11 is electrically connected with the second light receiving end of the fifth optocoupler B4 and the terminal 8SI of the live line of the outdoor unit.

[0114] Here, 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 twelfth diode V10, the eleventh diode V11 and the thirteenth diode V13 respectively have the functions of unidirectional isolation and bypass clamping protection, preventing abnormal high voltage from damaging the communication circuit caused by the error connection during the installation of the air conditioner 1000.

[0115] For example, if the live line L is mistakenly connected to the communication line SI of the indoor unit, due to the presence of the fifth diode V5, the current cannot flow reversely through the fifth diode V5, thereby avoiding the damage of the third optocoupler B2.

[0116] If the zero line N is mistakenly connected to the communication line SI, due to the presence of the third diode V3 and the fourth diode V4, the voltage across the second optocoupler B1 is limited, thereby avoiding the damage of the second optocoupler B1.

[0117] When the current of the communication circuit is abnormal (for example, the current value is greater than the preset current value), the temperature of the first thermistor RT1 rapidly rises, and the resistance rapidly increases, so as to rapidly reduce the current, thereby preventing the damage of the communication circuit caused by the error connection and the abnormal current. For example, in the case that the live line L is mistakenly connected to the terminal 8SI of the communication line of the outdoor unit, the temperature of the first thermistor RT1 can rapidly rise, and the resistance rapidly increases, so as to rapidly reduce the current, thereby avoiding the damage of the first optocoupler B7.

[0118] In some embodiments, as shown in FIG. 13, the indoor unit communication circuit 2 further comprises an eighth resistor R3, and the indoor unit communication circuit 2 further comprises a ninth resistor R4. The eighth resistor R3 and the ninth resistor R4 are respectively grounded.

[0119] The indoor unit communication circuit 2 further comprises a fifth resistor R5; and the indoor unit communication circuit 2 further comprises a sixth resistor R6. The fifth resistor R5 and the sixth resistor R6 respectively function as voltage reduction and current limiting.

[0120] The first end of the fifth resistor R5 is electrically connected with the indoor unit live terminal 7L, and the second end of the fifth resistor R5 is electrically connected with the anode of the third diode V3; the cathode of the fourth diode V4 is electrically connected with the cathode of the third diode V3 and the first light receiving end of the second optocoupler B1, and the anode of the fourth diode V4 is electrically connected with the second light receiving end of the second optocoupler B1 and the indoor unit communication line terminal 7SI; the first end of the sixth resistor R6 is electrically connected with the indoor unit zero terminal, the second end of the sixth resistor R6 is electrically connected with the anode of the fifth diode V5, the cathode of the fifth diode V5 is electrically connected with the first light emitting end of the third optocoupler B2 and the cathode of the sixth diode V6, and the anode of the sixth diode V6 is electrically connected with the second light emitting end of the third optocoupler B2 and the indoor unit communication line terminal 7SI.

[0121] The outdoor unit communication circuit 4 further comprises a tenth resistor R10; and the outdoor unit communication circuit 4 further comprises a twelfth resistor R12. The tenth resistor R10 and the twelfth resistor R12 are grounded.

[0122] The outdoor unit communication circuit 4 further comprises an eleventh resistor R11; the eleventh resistor R11 functions as clamping protection for the light emitting end of the seventh optocoupler B6.

[0123] The following is an example of the specific working process of the air conditioner 1000.

[0124] For the power-off state of the air conditioner 1000: when the air conditioner 1000 is connected to the alternating current from the outdoor unit 200, the alternating current is connected to the outdoor unit 200 and the indoor unit terminal block (for example, the first connector 8) from the first connector 7, and because the thyristor Q1 and the switch K1 are disconnected, the outdoor unit 200 is powered off and thus cannot work.

[0125] It should be noted that because the air conditioner 1000 is powered by the outdoor unit, and the indoor unit 100 needs to receive the user's instructions, the indoor unit 100 generally remains in the powered-on state, and the power-off state of the air conditioner 1000 can refer to the power-off state of the outdoor unit 200.

[0126] The power supply is connected to the indoor unit 100 through the first connector 8, and the indoor power supply conversion component 31 converts the alternating current high-voltage power supply into direct current low-voltage power supply and supplies power to the indoor unit main control circuit 1.

[0127] As shown in FIG. 14, when the fourth optocoupler B3 is turned on, the indoor unit main control circuit 1 receives a high level (for example, 5V), and when the fourth optocoupler B3 is disconnected, because the eighth resistor R3 is grounded, the indoor unit main control circuit 1 receives a low level (for example, 0V).

[0128] In addition, the live wire L or the neutral wire N is connected to the second optocoupler Bl and the third optocoupler B2 respectively after passing through the half-wave rectifier circuit, and is connected to the communication line SI, and reaches the outdoor unit after passing through the first thermistor RTl and the first optocoupler B7, and is connected to the sixth optocoupler B5 and the fifth optocoupler B4 respectively. In this way, the indoor and outdoor communication circuit can be formed.

[0129] For the standby state of the air conditioner 1000: since the second optocoupler Bl stops sending signals, the thyristor Ql is turned off, the outdoor unit main control circuit 3 controls the switch Kl to be turned off, the outdoor unit main control circuit 3 is powered off and thus stops running, at this time only the indoor main control circuit 1 is powered on and runs.

[0130] Referring to FIG. 14, the fourth optocoupler B3 can only be turned on and work after the voltage rises to exceed the turn-on voltage of the optocoupler after the zero-crossing of the alternating current signal. Therefore, the fourth optocoupler B3 can function to detect the zero-crossing signal of the alternating current and output the zero-crossing signal to the indoor unit main control circuit 1. When the air conditioner 1000 is in the standby state, the second optocoupler Bl is cut off, therefore, no signals (such as the first control signal and the first signal) are output from the communication line SI to the outdoor unit 200, and the outdoor unit communication circuit 4 does not work.

[0131] When the indoor unit 100 receives a start command, the indoor unit main control circuit 1 controls the second optocoupler Bl to be turned on. At this time, the current enters from the live wire L, passes through the fifth resistor R5, the third diode V3, the second optocoupler Bl of the indoor unit 100 in sequence, passes through the second thermistor RT2, and then is output to the first thermistor RTl, the first optocoupler B7, the eighth diode V8, and the sixth optocoupler B5 of the outdoor unit 200 through the communication line SI, and then returns to the outdoor unit neutral wire terminal 8N.

[0132] After the first optocoupler B7 is turned on, the thyristor Ql can be triggered to be turned on. After the thyristor Ql is turned on, the live wire L supplies power to the outdoor power conversion component 32 through the third thermistor RT3 and the thyristor Ql. After the outdoor power conversion component 32 is powered for a set time (for example, 2s), the outdoor power conversion component 32 can stably supply power to the outdoor unit main control circuit 3, referring to FIG. 14.

[0133] After the outdoor unit main control circuit 3 normally works, the outdoor unit main control circuit 3 controls the switch Kl to be closed, so that the branch of the third thermistor RT3 and the thyristor Ql is bypassed. In this way, when the outdoor unit 200 works, the outdoor unit 200 can be powered through the switch Kl.

[0134] As shown in Fig. 13, the zero line N is connected to the live line through the fourth resistor R7, the second diode V12 and the seventh optocoupler B6, to generate a zero-crossing detection signal output to the outdoor unit main control circuit 3. The seventh optocoupler B6 detects the zero-crossing signal of the alternating current in the same way as the fourth optocoupler B3. At this point, the outdoor unit main control circuit 3 is connected to the power supply, and the indoor unit 100 and the outdoor unit 200 can start communication.

[0135] Referring to Figs. 13 and 14, at this point, the indoor unit 100 acquires the zero-crossing time of the alternating current detected by the fourth optocoupler B3 according to the zero-crossing signal, and sends a first communication instruction (e.g., a first signal) by controlling the on-off of the second optocoupler B1 (conducting to send a high level 1, and non-conducting to send a low level 0), and the outdoor unit 200 receives the first communication instruction sent by the indoor unit 100 through the sixth optocoupler B5, and controls the related load of the outdoor unit 200 to start working according to the first communication instruction.

[0136] The specific signal flow of the first communication instruction is as follows: the live line L - the fifth resistor R5 - the third diode V3 - the second optocoupler B1 - the second thermistor RT2 - the first thermistor RT1 - the first optocoupler B7 - the eighth diode V8 - the sixth optocoupler B5 - the zero line N. The signal flow loop is the first loop 5.

[0137] Since the first loop 5 can only be conducted in one direction, it can only be conducted when the live line L outputs a high voltage, that is, it can only be conducted during the positive half cycle of the alternating current. Therefore, the indoor unit main control circuit 1 can only send the first signal and the first control signal after the fourth optocoupler B3 detects the zero-crossing time when the alternating current changes from negative voltage to positive voltage.

[0138] In addition, the outdoor unit 200 acquires the zero-crossing time of the alternating current detected by the seventh optocoupler B6 according to the zero-crossing signal, and sends a second communication instruction (e.g., a second signal) by controlling the on-off of the fifth optocoupler B4 (conducting to send a high level 1, and non-conducting to send a low level 0), and the indoor unit 100 receives the second communication instruction sent by the outdoor unit 200 through the third optocoupler B2, and controls the related load of the indoor unit 100 to adjust the working state according to the received second communication instruction.

[0139] The specific signal flow of the second communication instruction is as follows: the zero line N - the sixth resistor R6 - the fifth diode V5 - the third optocoupler B2 - the second thermistor RT2 - the first thermistor RT1 - the first optocoupler B7 - the twelfth diode V10 - the fifth optocoupler B4 - the live line L. The signal flow loop is the second loop 6.

[0140] Since the second circuit 6 can only be conducted in one direction, it can only be conducted when the zero line N outputs high voltage, that is, when the alternating current is in the negative half cycle. Therefore, the outdoor unit main control circuit 3 can send the second signal and the second control signal only after the seventh optical coupler B6 detects the zero-crossing moment when the alternating current changes from positive voltage to negative voltage.

[0141] Compared with the communication circuit (current loop communication circuit) in the related art, in the air conditioner 100 of some embodiments of the present disclosure, the indoor and outdoor units independently transmit communication commands and do not affect each other. For example, when the indoor unit 100 sends a command, since the signal circuit does not pass through the fifth optical coupler B4 of the outdoor unit 200, the command sent by the indoor unit 100 is not limited by whether the fifth optical coupler B4 is conducted or not.

[0142] In addition, when the indoor unit 100 sends a command, the signal circuit (such as the first circuit 5) can only be conducted in the positive half cycle of the alternating current, and when the outdoor unit 200 sends a command, the signal circuit (such as the second circuit 6) can only be conducted in the negative half cycle of the alternating current. Therefore, with reference to FIG. 14, even if the indoor and outdoor units send signals at the same time, the indoor unit 100 and the outdoor unit 200 can independently transmit their own signals without interfering with each other, under the condition that they share one communication line SI.

[0143] So far, the indoor unit 100 receives the power-on instruction to power on the outdoor unit 200, and the working process of communication between the indoor unit 100 and the outdoor unit 200 is completed.

[0144] When the indoor unit 100 receives the power-off instruction, the indoor unit 100 controls the second optical coupler B1 to be conducted to send a communication instruction to turn off. After the outdoor unit 200 receives the power-off instruction through the sixth optical coupler B5, it stops the work of the outdoor related load (such as the compressor and the outdoor fan) and returns the information that the power-off instruction is received to the indoor unit 100 through the fifth optical coupler B4. After receiving the reply, the indoor unit 100 controls the second optical coupler B1 to be cut off, and the current in the communication circuit SI stops outputting to the outdoor unit 200. After waiting for a set time, if the outdoor unit 200 confirms that there is no new instruction sent by the indoor unit 100, it controls the fifth optical coupler B4 to be cut off and controls the switch K1 to be turned off, thereby cutting off the power supply of the outdoor unit 200. At this time, since the second optical coupler B1 and the fifth optical coupler B4 are cut off respectively, and the first optical coupler B7 is not controlled to be conducted, the thyristor Q1 is turned off, and all paths of the power supply to the outdoor main control circuit 3 are cut off. So far, the outdoor unit 200 completes the power-off process and enters the power-off state, waiting for the next power-on working process.

[0145] It should be noted that any one of the technical solutions disclosed in the present disclosure can solve one or more of the above technical problems and achieve certain disclosed purposes; multiple technical disclosures can also be combined into one overall scheme to solve one or more of the above technical problems and achieve certain disclosed purposes; or some technical disclosures can be combined into one overall scheme, while related technologies and degraded schemes are used, but the degraded trend can be compensated for by the disclosed technical means, which can solve one or more of the above technical problems and achieve certain disclosed purposes to a certain extent. Each technical disclosure is combined into a complete technical scheme, which constitutes an organic and indivisible overall scheme, solves technical problems and achieves certain disclosed purposes.

[0146] Any one of the technical solutions disclosed in the present disclosure, and the recombination of multiple technical disclosures can form a complete technical scheme, and can solve one or more of the above technical problems to achieve the disclosed purposes, which belongs to the content of the present disclosure and is directly and without doubt determined according to the content of the present disclosure.

[0147] Those skilled in the art will understand that the scope of the disclosure is not limited to the above specific embodiments, and certain elements of the embodiments can be modified and replaced without departing from the spirit of the disclosure. The scope of the present disclosure is limited by the appended claims.

Claims

1. An air conditioner, comprising: Indoor unit, including: The indoor unit's main control circuit controls the operation of the indoor unit's communication circuit; and The 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; and An outdoor unit, electrically connected to the indoor unit, and comprising: The outdoor unit's main control circuit controls the operation of the outdoor unit's communication circuit; and The outdoor unit communication circuit has its control terminal electrically connected to the signal transmitting terminal of the outdoor unit main control circuit; the outdoor unit communication circuit is also electrically connected to the indoor unit communication circuit. The first part of the indoor unit communication circuit and the first part of the outdoor unit communication circuit constitute a first circuit; the signal transmitting end of the indoor unit main control circuit can send a first control signal; the first control signal can control the first circuit to conduct during the positive half-cycle of the AC power; the outdoor unit main control circuit can receive the first signal transmitted by the first circuit; the first signal can control the operation of the outdoor unit; The second part of the indoor unit communication circuit and the second part of the outdoor unit communication circuit constitute a second circuit; the signal transmitting end of the outdoor unit main control circuit can send a second control signal; the second control signal can control the second circuit to conduct during the negative half-cycle of the AC power; the indoor unit main control circuit can receive the second signal transmitted by the second circuit; the second signal can control the operation of the indoor unit.

2. The air conditioner according to claim 1 further includes a connector, wherein, 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: 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 the AC power supply, and the live wire output end of the connector is electrically connected to the live wire terminal of the indoor unit and the live wire terminal of the outdoor unit, respectively. The neutral output terminal of the connector is electrically connected to the neutral terminal of the indoor unit and the neutral terminal of the outdoor unit. The communication output terminal of the connector is electrically connected to the communication terminal of the indoor unit and the communication terminal of the outdoor unit.

3. The air conditioner of claim 2, wherein, The outdoor unit also includes: An outdoor power conversion component is provided to supply power to the outdoor main control circuit; and 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 component. The power control circuit can be turned on when the first control signal is sent to the signal transmitting end of the indoor unit main control circuit to turn on the first circuit, and the AC power supply charges the outdoor power conversion component through the turned-on power control circuit.

4. The air conditioner of claim 3, wherein, The power control circuit includes a thyristor; the control terminal of the thyristor is electrically connected to the second terminal of the power control circuit, the first terminal of the thyristor is electrically connected to the first terminal of the power control circuit, and the second terminal of the thyristor is electrically connected to the third terminal of the power control circuit.

5. The air conditioner of claim 4, wherein, The power control circuit also includes a switch; the control terminal of the switch is electrically connected to the control terminal of the outdoor unit main control circuit, the first terminal of the switch is electrically connected to the first terminal of the power control circuit, and the second terminal of the switch is electrically connected to the input terminal of the outdoor power conversion component; the switch is capable of conducting when the outdoor unit main control circuit is working.

6. The air conditioner of claim 5, wherein, The power control circuit also includes: A first resistor, wherein a first end of the first resistor is electrically connected to a first end of the thyristor, and a second end of the first resistor is electrically connected to the output terminal of the first circuit; and The second resistor has its first end electrically connected to the control terminal of the thyristor, and its second end is connected to... The second end of the thyristor is electrically connected.

7. The air conditioner of claim 6, wherein, The outdoor unit communication circuit also includes a first optocoupler. The first light-emitting end of the first optocoupler is electrically connected to the outdoor unit communication terminal. The second light-emitting end of the first optocoupler is connected to the outdoor unit live wire terminal or the outdoor unit neutral wire terminal. The first light-receiving end of the first optocoupler is electrically connected to the second end of the first resistor. The second light-receiving end of the first optocoupler is electrically connected to the first end of the second resistor and the control end of the thyristor. The first optocoupler can control the thyristor to conduct when the first circuit is on.

8. The air conditioner according to claim 6 or 7, wherein The power control circuit also includes a thermistor, the first end of which is electrically connected to the live wire terminal of the outdoor unit, and the second end of which is electrically connected to the first end of the first resistor and the first end of the thyristor.

9. The air conditioner according to any one of claims 2 to 8, wherein, The indoor unit communication circuit includes: A second optocoupler, wherein the first light-emitting end of the second optocoupler is electrically connected to the control terminal of the indoor unit communication circuit, and the second light-emitting end of the second optocoupler is electrically connected to the ground terminal; the first light-receiving end of the second optocoupler is electrically connected to the live wire terminal of the indoor unit, and the second light-receiving end of the second optocoupler is electrically connected to the communication terminal of the indoor unit; the second optocoupler is capable of conducting when receiving the first control signal, and the second optocoupler is capable of conducting during the positive half-cycle of the AC power; and The third optocoupler has a first light-receiving end electrically connected to the 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 third optocoupler is electrically connected to the neutral wire terminal of the indoor unit, and the second light-emitting end of the third optocoupler is electrically connected to the communication terminal of the indoor unit; the first output end of the indoor unit communication circuit is electrically connected to the signal receiving end of the indoor unit main control circuit; the third optocoupler can be turned on during the negative half-cycle of the AC power.

10. The air conditioner according to any one of claims 2 to 9, wherein, The indoor unit communication circuit includes: A first rectifier circuit, wherein a first terminal of the first rectifier circuit is electrically connected to the live wire terminal of the indoor unit; and The fourth optocoupler has a first light-receiving end electrically connected to the power supply end, a second light-receiving end electrically connected to the second output end of the indoor unit communication circuit, a first light-emitting end electrically connected to the second end of the first rectifier circuit, and a second light-emitting end 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 can receive the zero-crossing signal when the fourth optocoupler is turned on.

11. The air conditioner of claim 10, wherein, The first rectifier circuit includes: A third resistor, the first end of which is electrically connected to the live wire terminal of the indoor unit; and The first diode has its anode electrically connected to the second terminal of the third resistor, and its cathode electrically connected to the first light-emitting terminal of the fourth optocoupler.

12. The air conditioner according to any one of claims 2 to 11, wherein, The outdoor unit communication circuit includes: The fifth optocoupler has a first light-emitting terminal electrically connected to the control terminal of the outdoor unit's communication circuit, and a second light-emitting terminal electrically connected to the ground terminal; a first light-receiving terminal of the fifth optocoupler is electrically connected to the outdoor unit's communication line terminal; and a second light-receiving terminal of the fifth optocoupler is electrically connected to the outdoor unit's live wire terminal; the fifth optocoupler is capable of conducting when receiving the second control signal, and is capable of conducting during the negative half-cycle of the AC power supply; and The sixth optocoupler has a first light-receiving end electrically connected to the power supply terminal, and a second light-receiving end electrically connected to the first output terminal of the outdoor unit communication circuit; the first light-emitting end of the sixth optocoupler is electrically connected to the first light-receiving end of the fifth optocoupler, and the second light-emitting end of the sixth 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 sixth optocoupler can conduct during the positive half-cycle of the AC power. 13.The air conditioner according to any one of claims 2 to 12, wherein The outdoor unit communication circuit includes: A second rectifier circuit, the first terminal of which is electrically connected to the neutral wire terminal of the outdoor unit; and The seventh optocoupler has a first light-receiving end electrically connected to the power supply end, a second light-receiving end electrically connected to the second output end of the outdoor unit communication circuit, a first light-emitting end electrically connected to the second end of the second rectifier circuit, and a second light-emitting end 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, and the outdoor unit main control circuit can receive the zero-crossing signal when the seventh optocoupler is turned on. 14.The air conditioner of claim 13, wherein, The second rectifier circuit includes: The fourth resistor, the first end of which is electrically connected to the neutral wire terminal of the outdoor unit; and The second diode has its anode electrically connected to the second terminal of the fourth resistor, and its cathode electrically connected to the first light-emitting terminal of the seventh optocoupler.

15. The air conditioner according to any one of claims 2 to 14, wherein, The connector includes a first connector disposed on the outdoor unit; the live wire output terminal of the first connector is electrically connected to the live wire terminal of the outdoor unit and the live wire terminal of the indoor unit; the neutral wire output terminal of the first connector is electrically connected to the neutral wire terminal of the outdoor unit and the neutral wire terminal of the indoor unit; the communication wire output terminal of the first connector is electrically connected to the communication terminal of the outdoor unit and the communication terminal of the indoor unit.

16. The air conditioner according to any one of claims 2 to 14, wherein, The connector includes: A first connector is located at the outdoor unit; and The second connector is located on the indoor unit and is electrically connected to the first connector. The live wire output terminal of the first connector is electrically connected to the live wire terminal of the outdoor unit, and is electrically connected to the live wire terminal of the indoor unit through the second connector; the neutral wire output terminal of the first connector is electrically connected to the neutral wire terminal of the outdoor unit, and is electrically connected to the neutral wire terminal of the indoor unit through the second connector; the communication wire output terminal of the first connector is electrically connected to the communication terminal of the outdoor unit, and is electrically connected to the communication terminal of the indoor unit through the second connector.

17. The air conditioner according to any one of claims 2 to 16, wherein, The indoor unit also includes an indoor power conversion component. The input terminal of the indoor power conversion component is electrically connected to the live wire terminal and the neutral wire terminal of the indoor unit, and the output terminal of the indoor power conversion component is electrically connected to the main control circuit of the indoor unit. The indoor power conversion component can supply power to the main control circuit of the indoor unit.

18. The air conditioner of any one of claims 2 to 17, wherein, The indoor unit communication circuit further includes a third diode, a fourth diode, a fifth diode, a sixth diode, a fifth resistor, and a sixth resistor; the first end of the fifth resistor is electrically connected to the live wire terminal of the indoor unit, and the second end of the fifth resistor is electrically connected to the anode of the third diode; the cathode of the fourth diode is electrically connected to the cathode of the third diode and the first light-receiving end of the second optocoupler, and the anode of the fourth diode is electrically connected to the second light-receiving end of the second optocoupler and the communication line terminal of the indoor unit; the first end of the sixth resistor is electrically connected to the neutral wire terminal of the indoor unit, the second end of the sixth resistor is electrically connected to the anode of the fifth diode, the cathode of the fifth diode is electrically connected to the first light-emitting end of the third optocoupler and the cathode of the sixth diode, and the anode of the sixth diode is electrically connected to the second light-emitting end of the third optocoupler and the communication line terminal of the indoor unit.

19. The air conditioner of any one of claims 2 to 18, wherein, The outdoor unit communication circuit further includes a seventh diode, an eighth diode, a ninth diode, a tenth diode, and an eleventh diode. The cathode of the seventh diode is electrically connected to the outdoor unit communication line terminal and the first light-emitting terminal of the first optocoupler. The anode of the seventh diode is electrically connected to the anode of the eighth diode and the second light-emitting terminal of the first optocoupler. The cathode of the eighth diode is electrically connected to the first light-emitting terminal of the sixth optocoupler and the cathode of the ninth diode. The anode of the ninth diode is electrically connected to the second light-emitting terminal of the sixth optocoupler and the outdoor unit neutral wire terminal. The anode of the tenth diode is electrically connected to the anode of the seventh diode, the second light-emitting terminal of the first optocoupler, and the anode of the eighth diode. The cathode of the tenth diode is electrically connected to the cathode of the eleventh diode and the first light-receiving terminal of the fifth optocoupler. The anode of the eleventh diode is electrically connected to the second light-receiving terminal of the fifth optocoupler and the outdoor unit live wire terminal.

20. An air conditioner, comprising: The indoor unit's main control circuit can control the operation of the indoor unit's 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 outdoor unit's main control circuit controls the operation of the outdoor unit's communication circuit; and The outdoor unit communication circuit has its control terminal electrically connected to the signal transmitting terminal of the outdoor unit main control circuit; the outdoor unit communication circuit is also electrically connected to the indoor unit communication circuit. The first part of the indoor unit communication circuit and the first part of the outdoor unit communication circuit constitute a first circuit; the signal transmitting end of the indoor unit main control circuit can send a first control signal; the first control signal can control the first circuit to conduct during the positive half-cycle of the AC power; the outdoor unit main control circuit can receive the first signal transmitted by the first circuit; the first signal can control the operation of the outdoor unit; The second part of the indoor unit communication circuit and the second part of the outdoor unit communication circuit constitute a second circuit; the signal transmitting end of the outdoor unit main control circuit can send a second control signal; the second control signal can control the second circuit to conduct during the negative half-cycle of the AC power; the indoor unit main control circuit can receive the second signal transmitted by the second circuit; the second signal can control the operation of the indoor unit.

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