Air conditioning system

Abstract

The utility model discloses an air conditioning system. A current loop communication circuit is arranged between an indoor main control board and an outdoor main control board of the air conditioning system. The air conditioning system further comprises a first switch, a second switch, an auxiliary awakening branch circuit, an S line connected with the current loop communication circuit and a capacitor assembly of a first switching power supply on the outdoor side. And under the condition that the first switch is closed and the second switch is opened, an energy charging loop for charging the capacitor assembly of the first switching power supply is formed between the L line and the N line of the current loop communication circuit through the S line of the current loop communication circuit and the auxiliary wake-up branch, so that the outdoor main control board is started by utilizing the voltage at the two ends of the capacitor assembly of the first switching power supply. In the embodiment of the invention, the auxiliary wake-up branch is arranged in the energy charging loop and is connected with the first switch in series for voltage division, so that the space of layout elements on the indoor main control board can be saved, and the cost of the indoor main control board can be lower.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioner control, and in particular to an air conditioning system. Background Art

[0002] The communication method between the indoor unit and the outdoor unit in the variable frequency split air conditioner is mostly current loop communication, which has the characteristics of strong anti-interference ability and low cost. In order to achieve low power standby, the indoor main control board generally reserves a high-power relay to cut off the power supply of the outdoor unit, so as to reduce the power consumption of the whole machine when standby is required. If cooling or heating is required in the standby state, the indoor unit main control board controls the high-power relay to pull in, supply power to the outdoor unit and wake up the outdoor main control board.

[0003] As air conditioners have more and more additional functions, the indoor main control board usually needs to miniaturize the components in order to arrange more components in a limited space. However, high-power relays withstand large power and are large in size and height, making it difficult to miniaturize the relays. Utility Model Content

[0004] This embodiment provides an air conditioning system, which can save space for layout of components on an indoor main control board.

[0005] In a first aspect, an embodiment of the present application provides an air conditioning system, wherein a current loop communication circuit is provided between an indoor main control board and an outdoor main control board of the air conditioning system, and the current loop communication circuit is connected to an AC input terminal of a first switching power supply of the outdoor main control board through an L line and an N line on the outdoor side; the air conditioning system further comprises:

[0006] A first switch is connected to the L line and the S line of the current loop communication circuit on the indoor side;

[0007] A second switch is arranged on the outdoor side between the L line of the current loop communication circuit and the AC input terminal of the first switching power supply;

[0008] An auxiliary wake-up branch is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply on the outdoor side; when the first switch is closed and the second switch is opened, a charging loop for charging the capacitor component of the first switching power supply is formed between the L line and the N line of the current loop communication circuit through the S line of the current loop communication circuit and the auxiliary wake-up branch, so as to start the outdoor main control board by using the voltage across the capacitor component of the first switching power supply.

[0009] In some embodiments, the first switching power supply includes a first rectifier bridge circuit and a first transformer, one end of the capacitor component of the first switching power supply is connected to the positive output end of the first rectifier bridge circuit, the other end of the capacitor component of the first switching power supply is connected to the negative output end of the first rectifier bridge circuit, and the capacitor component of the first switching power supply is connected to the primary side of the first transformer, and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board.

[0010] In some embodiments, the auxiliary wake-up branch includes a unidirectional conductive element and a voltage-dividing resistor, the negative end of the unidirectional conductive element is connected to the S line of the current loop communication circuit, the positive end of the unidirectional conductive element is connected to one end of the voltage-dividing resistor, and the other end of the voltage-dividing resistor is connected to the connection point between the capacitor component of the first switching power supply and the negative output end of the first rectifier bridge circuit.

[0011] In some embodiments, the first switching power supply further includes a voltage conversion circuit, and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board through the voltage conversion circuit.

[0012] In some embodiments, the communication power supply includes a first resistor, a second resistor, a first diode, a clamping capacitor and a Zener diode. The clamping capacitor is arranged on the indoor side of the N line of the current loop communication circuit. The clamping capacitor, the Zener diode and the first resistor are connected in parallel. The positive electrode of the Zener diode is connected to the L line of the current loop communication circuit through the second resistor and the first diode, and the negative electrode of the Zener diode provides a clamping voltage.

[0013] In some embodiments, the first switch is a low power relay and the second switch is a high power relay.

[0014] In some embodiments, the first switching power supply further includes a second diode, the positive electrode of the secondary side of the first transformer is connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the main control chip of the outdoor main control board through the voltage conversion circuit.

[0015] In some embodiments, the current loop communication circuit is connected to the AC input terminal of the second switching power supply of the indoor main control board through the L line and the N line on the indoor side.

[0016] In some embodiments, the second switching power supply includes a second rectifier bridge circuit and a second transformer, one end of the capacitor component of the second switching power supply is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the second switching power supply is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the second switching power supply is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the main control chip of the indoor main control board.

[0017] The air-conditioning system of this embodiment has at least the following beneficial effects: the air-conditioning system based on the current loop communication circuit is provided with a first switch on the indoor side, and the L line and the S line of the current loop communication circuit are connected on the indoor side when the first switch is closed; the air-conditioning system is provided with a second switch on the outdoor side, and the N line of the current loop communication circuit - the capacitor component of the first switch power supply - the auxiliary wake-up branch - the S line on the outdoor side when the second switch is opened; therefore, when it is necessary to wake up the outdoor main control board, the first switch is controlled to be closed and the second switch is controlled to be opened, so that a charging circuit from the N line of the current loop communication circuit - the capacitor component of the first switch power supply - the auxiliary wake-up branch - the S line - the first switch - the L line can be formed, the capacitor component of the first switch power supply is charged, and then the voltage across the capacitor component of the first switch power supply is used to provide a working voltage for the main control chip of the outdoor main control board, thereby waking up the outdoor unit; in the above-mentioned charging circuit, since the auxiliary wake-up branch is provided in series with the first switch for voltage division, the power that the first switch needs to bear is reduced, and the first switch does not need to use large-volume devices such as high-power relays, so that the space for layout components on the indoor main control board can be saved, and the cost of the indoor main control board can also be lower.

[0018] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a circuit diagram of an air conditioning system provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the current flow direction during the wake-up process provided by an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the direction of current flow during the communication process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods.

[0023] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0025] The communication method between the indoor unit and the outdoor unit in the variable frequency split air conditioner is mostly current loop communication, which has the characteristics of strong anti-interference ability and low cost. In order to achieve low power standby, the indoor main control board generally reserves a high-power relay to cut off the power supply of the outdoor unit, so as to reduce the power consumption of the whole machine when standby is required. If cooling or heating is required in the standby state, the indoor unit main control board controls the high-power relay to pull in, supply power to the outdoor unit and wake up the outdoor main control board.

[0026] As air conditioners have more and more additional functions, the indoor main control board usually needs to miniaturize the components in order to arrange more components in a limited space. However, high-power relays withstand large power and are large in size and height, making it difficult to miniaturize the relays.

[0027] Based on this, the present embodiment provides an air-conditioning system, in which a first switch is arranged on the indoor side of the air-conditioning system based on the current loop communication circuit, and when the first switch is closed, the L line and the S line of the current loop communication circuit are connected on the indoor side; and a second switch is arranged on the outdoor side of the air-conditioning system, and when the second switch is opened, the N line of the current loop communication circuit - the capacitor component of the first switch power supply - the auxiliary wake-up branch - the S line are connected on the outdoor side. Therefore, when it is necessary to wake up the outdoor main control board, the first switch is controlled to be closed and the second switch is opened, so that a charging circuit from the N line of the current loop communication circuit - the capacitor component of the first switch power supply - the auxiliary wake-up branch - the S line - the first switch - the L line can be formed to charge the capacitor component of the first switch power supply, and then the voltage across the capacitor component of the first switch power supply is used to provide a working voltage for the main control chip of the outdoor main control board, thereby waking up the outdoor unit; in the above-mentioned charging circuit, since the auxiliary wake-up branch is arranged in series with the first switch to divide the voltage, the power that the first switch needs to bear is reduced, and the first switch does not need to use large-volume devices such as high-power relays, so that the space for layout components on the indoor main control board can be saved, and the cost of the indoor main control board can also be lower.

[0028] The air conditioning system is described in detail below with reference to the accompanying drawings:

[0029] Reference Figure 1 As shown, Figure 1 A circuit diagram of an air conditioning system provided in an embodiment of the present application.

[0030] A current loop communication circuit is provided between the indoor main control board and the outdoor main control board of the air-conditioning system in the embodiment of the present application. The current loop communication circuit is connected to the AC input terminal of the first switching power supply 510 of the outdoor main control board through the L line and the N line on the outdoor side.

[0031] In some embodiments, the air conditioning system also includes a first switch RY1 arranged on the indoor side and a second switch RY2 arranged on the outdoor side, wherein the first switch RY1 connects the L line and the S line of the current loop communication circuit, so that the current loop communication circuit can be controlled to be connected or disconnected through the switching state of the first switch RY1, and the second switch RY2 is arranged between the L line of the current loop communication circuit and the AC input end of the first switching power supply 510.

[0032] It can be understood that the current loop communication circuit in this embodiment includes an L line, an S line and an N line, wherein the L line is a live line, the N line is a neutral line, and the S line is a communication line. The power supply and communication of the indoor main control board and / or the outdoor main control board are realized through the cooperation of the first switch RY1, the second switch RY2, the L line, the S line and the N line. Among them, the first switch RY1 and the second switch RY2 in this embodiment can be relays, photoelectric switches, transistors, etc., and this embodiment does not make any specific restrictions on the selection of the first switch RY1 and the second switch RY2.

[0033] Specifically, in the prior art, a high-power relay is generally set on the indoor main control board, resulting in the high-power relay occupying too much space on the indoor main control board, which may limit the localization and design of other functional modules, and further limit the function of the air-conditioning system. In the embodiment of the present application, the first switch RY1 is a low-power relay, and the second switch RY2 is a high-power relay, that is, the first switch RY1 on the indoor main control board can be a single-pole single-throw low-power small-volume relay, a small solid-state relay or a high-voltage switch tube, etc., and the second switch RY2 on the outdoor main control board can be a single-pole single-throw relay, thereby saving space on the indoor main control board, reducing the space occupied by the first switch RY1 on the indoor main control board, and further reducing the cost of the indoor main control board, while ensuring the normal operation of the air-conditioning system.

[0034] In some embodiments, the auxiliary wake-up branch 200 is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply 510 on the outdoor side, wherein the auxiliary wake-up branch 200 includes a unidirectional conducting element D4 and a voltage-dividing resistor R1, the negative end of the unidirectional conducting element D4 is connected to the S line of the current loop communication circuit, the positive end of the unidirectional conducting element D4 is connected to one end of the voltage-dividing resistor R1, and the other end of the voltage-dividing resistor R1 is connected to the connection point between the capacitor component of the first switching power supply 510 and the negative output end of the first rectifier bridge circuit. The unidirectional conducting element D4 is used to prevent the current from flowing in reverse, that is, to ensure that the signal can only be transmitted from the auxiliary wake-up circuit to the S line to prevent the current from being transmitted in reverse, and the voltage-dividing resistor R1 is connected to the positive end of the unidirectional conducting element D4, so that the voltage flowing into the unidirectional conducting element D4 can be stepped down, thereby reducing interference and noise in the auxiliary wake-up branch 200.

[0035] It should be noted that the unidirectional conducting element D4 and the voltage-dividing resistor R1 can also provide protection for the auxiliary wake-up branch 200 in some cases, limit the current, and prevent the auxiliary wake-up circuit from being damaged due to excessive voltage or current.

[0036] It can be understood that the unidirectional conductive element D4 in this embodiment can be a diode such as a photodiode, a light emitting diode, etc., and this embodiment does not make any specific limitation.

[0037] In some embodiments, when the air-conditioning system is just powered on, the first switch RY1 of the indoor main control board and the second switch RY2 of the outdoor main control board are in the disconnected state. At this time, the L line and the N line do not form a loop, and the main control chip 600 of the outdoor main control board is in a power-off state. Only the indoor main control board has power, and the indoor main control board enters the standby state without user operation. Therefore, the whole machine can achieve low-power standby in this state.

[0038] When the user needs cooling or heating, the mode can be switched by adjusting the opening and closing states of the first switch RY1 and the second switch RY2. The specific operation process is as follows.

[0039] It can be understood that when the air-conditioning system is in standby mode, the indoor main control board needs to wake up the outdoor main control board in the power-off state. At this time, the first switch RY1 is closed and the second switch RY2 is opened. The current flows out from the N line, and flows through the capacitor component of the first switching power supply 510, the auxiliary wake-up branch 200, the S line, the first switch RY1 in sequence, and finally flows into the L line, so that a charging circuit for charging the capacitor component of the first switching power supply 510 is formed between the L line and the N line of the current loop communication circuit through the S line of the current loop communication circuit and the auxiliary wake-up branch 200, thereby realizing the charging of the capacitor component of the first switching power supply 510, and further using the voltage across the capacitor component of the first switching power supply 510 to start the outdoor main control board, thereby realizing the wake-up of the outdoor unit.

[0040] In some embodiments, the first switching power supply 510 includes a first rectifier bridge circuit and a first transformer, and the AC power signal is converted into a DC power signal through the first rectifier bridge circuit to provide a stable DC output. One end of the capacitor component of the first switching power supply 510 is connected to the positive output end of the first rectifier bridge circuit, and the other end of the capacitor component of the first switching power supply 510 is connected to the negative output end of the first rectifier bridge circuit, so that the noise in the power supply can be filtered through the capacitor component E5 in the first switching power supply 510, and the capacitor component can provide an additional power supply filtering function, and the capacitor component of the first switching power supply 510 is connected to the primary side of the first transformer, and the secondary side of the first transformer is connected to the main control chip 600 of the outdoor main control board, so that different voltage outputs can be sensed according to the voltage change applied on the primary side. Through the mutual cooperation of the first rectifier bridge circuit and the first transformer, a stable power supply can be provided to the main control chip, ensuring the normal operation of the main control chip and ensuring the correct transmission and stability of the signal.

[0041] It is understandable that the first transformer can convert one level to another level, that is, the voltage can be increased or decreased according to the turns ratio of the transformer. One end of the capacitor component of the first switching power supply 510 of this embodiment is connected to the positive output end of the first rectifier bridge circuit, and the other end of the capacitor component of the first switching power supply 510 is connected to the negative output end of the first rectifier bridge circuit. The first rectifier bridge circuit outputs a voltage to the capacitor component of the first switching power supply 510, so that the capacitor component of the first switching power supply 510 can store and release electrical energy within the voltage cycle, and can filter out harmonics caused by nonlinear loads, effectively reduce harmonic components, improve the stability and reliability of the air-conditioning system, and can change the voltage applied to the primary side of the first transformer, so that the secondary side of the first transformer can sense different voltage outputs, ensure the stability of the output voltage, and provide additional power supply filtering functions, so as to achieve stable power supply to the main control chip, to ensure the normal operation of the main control chip, and protect it from interference in the power supply.

[0042] It should be noted that the first rectifier bridge circuit in this embodiment includes a first bridge arm and a second bridge arm, each bridge arm is respectively provided with a connected diode, and the input end of the first bridge arm in the first rectifier bridge circuit is connected to the N line, and the second switch RY2 is arranged between the L line and the input end of the second bridge arm.

[0043] Specifically, the first bridge arm includes a third diode D9 and a fourth diode D13, the anode of the third diode D9 is connected to the cathode of the fourth diode D13, the second bridge arm includes a fifth diode D10 and a sixth diode D14, the anode of the fifth diode D10 is connected to the cathode of the sixth diode D14, and the input end of the first bridge arm is between the third diode D9 and the fourth diode D13, and the input end of the second bridge arm is between the fifth diode D10 and the sixth diode D14.

[0044] Reference Figure 2 As shown, Figure 2 A schematic diagram of the current flow direction of the wake-up process provided in an embodiment of the present application.

[0045] Understandably, Figure 2 The solid arrow in the figure indicates the direction of current flow.

[0046] Depend on Figure 2It can be seen that when the first switch RY1 is closed and the second switch RY2 is open, the current flows out from the N line, flows into the first bridge arm of the first rectifier bridge circuit, and then flows into the capacitor component of the first switching power supply 510, charging the capacitor component of the first switching power supply 510 on the primary side of the first transformer, and then flows into the voltage divider resistor R1 and the unidirectional conduction element D4 in the auxiliary wake-up branch 200. Since the first switch RY1 is closed at this time, the current can directly flow into the L line through the S line and the first switch RY1, thereby forming a charging circuit from the N line of the current loop communication circuit-the first bridge arm of the first rectifier bridge circuit-the capacitor component of the first switching power supply 510-the auxiliary wake-up branch 200-S line-the first switch RY1-L line. In this process, the capacitor component of the first switching power supply 510 is charged. When the capacitor component is fully charged, the voltage across the capacitor component of the first switching power supply 510 is used to provide a working voltage for the main control chip 600 of the outdoor main control board, so that the outdoor unit is awakened from the power-off mode.

[0047] In some embodiments, the embodiments of the present application may also set the first switch RY1 between the S line and the N line of the current loop communication circuit, and the second switch RY2 between the N line and the input end of the first bridge arm in the first rectifier bridge circuit, and one end of the voltage divider resistor R1 of the auxiliary wake-up branch 200 is connected to the S line of the current loop communication circuit, and the other end is connected to the positive end of the unidirectional conduction element D4, and the negative end of the unidirectional conduction element D4 is connected to the positive output end of the first rectifier bridge circuit. When the first switch RY1 is closed and the second switch RY2 is open, the current loop communication circuit forms a charging loop between the N line and the L line through the auxiliary wake-up branch 200 to charge the capacitor component of the first switching power supply 510. Specifically, the current flows out from the N line. Since the first switch RY1 is closed at this time, the current can directly flow into the S line through the first switch RY1, and then flow into the voltage divider resistor R1 and the unidirectional conduction element D4 in the auxiliary wake-up branch 200, and then flow into the capacitor component E5 in the first switching power supply 510, and finally flow out through the first bridge arm of the first rectifier bridge circuit, and flow to the L line, forming a loop of N line-first switch RY1-S line-auxiliary wake-up branch 200-capacitor component E5 in the first switching power supply 510-first bridge arm-L line.

[0048] It can be understood that the conduction element in this embodiment can be a diode such as a photodiode, a light emitting diode, etc., and this embodiment does not make any specific limitation.

[0049] In some embodiments, when the charging of the capacitor component E5 in the first switching power supply 510 is completed, the first switching power supply 510 is working, and the outdoor unit is awakened from the power-off state. The main control chip 600 of the outdoor main control board will close the second switch RY2. When the first switch RY1 and the second switch RY2 are closed at the same time, the current will directly charge the capacitor component E5 in the first switching power supply 510 from the L line to the N line. At this time, the auxiliary wake-up branch 200 is similar to a short-circuited state, and almost no current flows through the channel of the auxiliary wake-up branch 200. That is, when the first switch RY1 and the second switch RY2 are closed at the same time, the entire air-conditioning system can work normally, but the outdoor unit cannot communicate with the indoor unit at this time because the current loop communication circuit is short-circuited by the first switch RY1. If the outdoor unit wants to communicate with the indoor unit, the first switch RY1 needs to be disconnected.

[0050] In some embodiments, the first switching power supply 510 also includes a voltage conversion circuit 300. The secondary side of the first transformer is connected to the main control chip 600 of the outdoor main control board through the voltage conversion circuit 300, so that the voltage level of the output voltage of the secondary side of the first transformer can be adjusted to achieve voltage conversion on the secondary side of the first transformer, and can ensure the specific requirements of the output voltage load. The voltage output end of the voltage conversion circuit 300 is connected to the main control chip 600 of the outdoor main control board, so as to achieve stable power supply to the main control chip 600 of the outdoor main control board and meet the power supply requirements of the main control chip 600 of the outdoor main control board.

[0051] In some embodiments, the air conditioning system also includes a communication power supply 400, which includes an L line and an N line connected to the current loop communication circuit on the indoor side, and is used to provide a clamping voltage to the current loop communication circuit, wherein the communication power supply 400 includes a first resistor R3, a second resistor R4, a first diode D3, a clamping capacitor E1 and a Zener diode DZ2, the clamping capacitor E1 is arranged on the N line of the current loop communication circuit on the indoor side, the clamping capacitor E1, the Zener diode DZ2 and the first resistor R3 are connected in parallel, the positive electrode of the Zener diode DZ2 is connected to the L line of the current loop communication circuit through the second resistor R4 and the first diode D3, the negative electrode of the Zener diode DZ2 provides the clamping voltage, and the first resistor R3 and the second resistor R4 cooperate to divide the voltage to achieve the reduction of the output clamping voltage, and the Zener diode DZ2 can stabilize the reduced voltage, so that the clamping voltage can be provided stably.

[0052] It can be understood that the 24V power supply is generated by the half-wave voltage regulator power supply composed of the first resistor R3, the second resistor R4, the first diode D3, the clamping capacitor E1 and the voltage regulator diode DZ2 in this embodiment, and the power supply is superimposed on the N line.

[0053] It should be noted that in the embodiment of the present application, the positive pole of the first diode D3 is connected to the second resistor R4, and the negative pole is connected to the L line of the current loop communication circuit, so as to realize the unidirectional conduction of the current. The input voltage is reduced to the required voltage level through the voltage division effect of the first resistor R3 and the second resistor R4, and different output voltages can be achieved by adjusting the resistance ratio of the two resistors. The positive pole of the first diode D3 is connected to the connection point of the second resistor R4, which plays a role in reverse blocking the flow of current, determining the clamping direction, and preventing the current from flowing back to the communication power supply 400. The clamping capacitor E1 is connected in parallel with the voltage stabilizing diode DZ2 and the second resistor R4, so as to provide a stable output voltage, wherein the clamping capacitor E1 acts as a storage device, which can provide or absorb charge when the output terminal voltage changes instantaneously to maintain the stability of the output voltage. The negative pole of the voltage stabilizing diode DZ2 is connected to the connection point of the first resistor R3 and the second resistor R4, so as to provide a fixed clamping voltage to ensure that the output voltage is stable within a certain range. The stable provision of the clamping voltage is achieved by the mutual cooperation of various components in the communication power supply 400.

[0054] It is understandable that the magnitude of the clamping voltage output by the communication power supply 400 can be adjusted according to the ratio of the first resistor R3 and the second resistor R4 to meet the working voltage requirements of the main circuit. The resistance values ​​of the first resistor R3 and the second resistor R4 can be set according to the needs of the user, and this embodiment does not impose specific restrictions.

[0055] In some embodiments, the air-conditioning system also includes an indoor data receiving optocoupler IC3 and an indoor data sending optocoupler IC1 arranged on the indoor side, and an outdoor data receiving optocoupler IC4 and an outdoor data sending optocoupler IC2 arranged on the outdoor side, wherein the indoor main control board receives data through the indoor data receiving optocoupler IC3, and the indoor main control board sends data through the indoor data sending optocoupler IC1, similarly, the outdoor main control board receives data through the outdoor data receiving optocoupler IC4, and sends data through the outdoor data sending optocoupler IC2.

[0056] Specifically, the positive electrode of the light-emitting diode of the indoor data receiving optocoupler IC3 is connected to the S line of the current loop communication circuit, and the negative electrode is connected to the photosensitivity component of the indoor data sending optocoupler IC1; one end of the indoor data sending optocoupler IC1 is connected to the negative electrode of the light-emitting diode of the indoor data receiving optocoupler IC3, and the other end is connected to the communication power supply 400; one end of the photosensitive component of the outdoor data sending optocoupler IC2 is connected to the S line of the current loop communication circuit, and the other end is connected to the negative electrode of the light-emitting diode of the outdoor data receiving optocoupler IC4; the positive electrode of the light-emitting diode of the outdoor data receiving optocoupler IC4 is connected to the N line of the current loop communication circuit; the indoor main control board and the outdoor main control board in this embodiment are respectively provided with optocoupler components, so that the connection status and communication status of the indoor main control board and the outdoor main control board can be determined, and the optocoupler transmission is not affected by electromagnetic interference, which improves the anti-interference ability of the communication system and further improves the stability and safety of the air-conditioning system.

[0057] It is worth noting that in this embodiment, the indoor data receiving optocoupler IC3, the indoor data sending optocoupler IC1, the outdoor data receiving optocoupler IC4, and the outdoor data sending optocoupler IC2 can form a communication loop, and the power supply for the communication loop comes from the 24V power supply generated by the half-wave zener diode power supply composed of the first resistor R3, the second resistor R4, the first diode D3, the clamping capacitor E1 and the zener diode DZ2 in the communication power supply 400, and the power supply is superimposed on the N line.

[0058] In some embodiments, during the communication between the indoor main control board and the outdoor main control board, after the outdoor main control board wakes up, the outdoor main control board will attract the outdoor data receiving optocoupler IC4 and the outdoor data sending optocoupler IC2, and wait to receive the command sent by the indoor main control board. At this time, the indoor main control board attracts the indoor data sending optocoupler IC1 and the indoor data receiving optocoupler IC3, and sends instructions through the indoor data sending optocoupler IC1. The outdoor main control board receives the instructions sent by the indoor main control board through the outdoor data receiving optocoupler IC4, and returns the corresponding response instructions through the outdoor data sending optocoupler IC2. The indoor main control board receives the response instructions sent by the outdoor main control board through the indoor receiving optocoupler, so that the wake-up status or working status of the outdoor main control board can be determined through the change of the optocoupler, thereby realizing the detection of the working status of the outdoor main control board. The current flow during the communication process is shown as follows.

[0059] Reference Figure 3 As shown, Figure 3 A schematic diagram of the direction of current flow during the communication process provided in an embodiment of the present application.

[0060] Understandably, Figure 3 The solid arrow in the figure indicates the direction of current flow.

[0061] In some embodiments, the current loop communication circuit is connected to the AC input terminal of the second switching power supply 520 of the indoor main control board through the L line and the N line on the indoor side.

[0062] In some embodiments, after the outdoor main control board is awakened, the outdoor main control board will pull in the outdoor data receiving optocoupler IC4 and wait for the command from the indoor main control board. Figure 3 As shown, after the current flows out from the clamping capacitor E1 of the communication power supply 400, it flows through the N line, then flows from the outdoor data receiving optocoupler IC4 to the outdoor data sending optocoupler IC2, and finally flows from the indoor data receiving optocoupler IC3 to the 0V voltage point of the indoor data sending optocoupler IC1, forming a loop of clamping capacitor E1-N line-outdoor data receiving optocoupler IC4-outdoor data sending optocoupler IC2-indoor data receiving optocoupler IC3-indoor data sending optocoupler IC1-0V voltage point, completing a communication process.

[0063] It should be noted that during the communication between the outdoor main control board and the indoor main control board, due to the blocking of the unidirectional conductive element D4 in the auxiliary wake-up branch 200, the current will not flow into the first rectifier bridge circuit through the auxiliary wake-up branch 200. Therefore, the circuit can save a relay or avoid the use of double-pole or single-pole double-throw relays, thereby greatly reducing costs.

[0064] In some embodiments, the first switching power supply 510 also includes a second diode D5, the positive electrode of the secondary side of the first transformer is connected to the positive electrode of the second diode D5, and the negative electrode of the second diode D5 is connected to the main control chip 600 of the outdoor main control board through the voltage conversion circuit 300, thereby limiting the direction of current flow, thereby protecting the voltage conversion circuit 300 and avoiding component damage under reverse voltage, overvoltage or overcurrent conditions.

[0065] In some embodiments, the second switching power supply 520 includes a second rectifier bridge circuit and a second transformer, one end of the capacitor component of the second switching power supply 520 is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the second switching power supply 520 is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the second switching power supply 520 is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the main control chip of the indoor main control board, so that the AC signal can be converted into a DC signal through the second rectifier bridge circuit, the capacitor component is connected to the positive output end and the negative output end of the second rectifier bridge circuit, so that the fluctuation of the output voltage can be smoothed, the primary side of the second transformer is connected to the capacitor component of the second switching power supply 520 to determine the voltage across the capacitor component, so that the secondary side of the second transformer can sense different voltage outputs according to the voltage changes on the primary side, thereby realizing stable power supply to the main control chip of the indoor main control board.

[0066] It should be noted that the second rectifier bridge in this embodiment includes a third bridge arm and a fourth bridge arm, each bridge arm is respectively provided with a connected diode, and the input end of the third bridge arm in the second rectifier bridge circuit is connected to the N line, and the first switch RY1 is arranged between the S line and the input end of the fourth bridge arm.

[0067] Specifically, the third bridge arm includes a seventh diode D7 and an eighth diode D11, the anode of the seventh diode D7 is connected to the cathode of the eighth diode D11, the fourth bridge arm includes a ninth diode D8 and a tenth diode D12, the anode of the ninth diode D8 is connected to the cathode of the tenth diode D12, and the input end of the third bridge arm is between the seventh diode D7 and the eighth diode D11, and the input end of the fourth bridge arm is between the ninth diode D8 and the tenth diode D12.

[0068] It can be understood by those skilled in the art that Figure 1-3 The schematic diagrams shown in the figure do not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0069] The features disclosed in the various product embodiments provided by the utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0070] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed to multiple network nodes. Exemplarily, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be electrical, mechanical, or other forms. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0071] It will be appreciated by those skilled in the art that the system disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.

[0072] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An air conditioning system, characterized in that: A current loop communication circuit is provided between the indoor main control board and the outdoor main control board of the air conditioning system, and the current loop communication circuit is connected to the AC input end of the first switch power supply of the outdoor main control board through the L line and the N line on the outdoor side; the air conditioning system also includes: A first switch is connected to the L line and the S line of the current loop communication circuit on the indoor side; A second switch is arranged on the outdoor side between the L line of the current loop communication circuit and the AC input terminal of the first switching power supply; An auxiliary wake-up branch is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply on the outdoor side; when the first switch is closed and the second switch is opened, a charging loop for charging the capacitor component of the first switching power supply is formed between the L line and the N line of the current loop communication circuit through the S line of the current loop communication circuit and the auxiliary wake-up branch, so as to start the outdoor main control board by using the voltage across the capacitor component of the first switching power supply.

2. The air conditioning system according to claim 1, characterized in that: The first switching power supply includes a first rectifier bridge circuit and a first transformer, one end of the capacitor component of the first switching power supply is connected to the positive output end of the first rectifier bridge circuit, the other end of the capacitor component of the first switching power supply is connected to the negative output end of the first rectifier bridge circuit, and the capacitor component of the first switching power supply is connected to the primary side of the first transformer, and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board.

3. The air conditioning system according to claim 2, characterized in that: The auxiliary wake-up branch includes a unidirectional conductive element and a voltage-dividing resistor, the negative end of the unidirectional conductive element is connected to the S line of the current loop communication circuit, the positive end of the unidirectional conductive element is connected to one end of the voltage-dividing resistor, and the other end of the voltage-dividing resistor is connected to the connection point between the capacitor component of the first switching power supply and the negative output end of the first rectifier bridge circuit.

4. The air conditioning system according to claim 2, characterized in that: The first switching power supply further includes a voltage conversion circuit, and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board through the voltage conversion circuit.

5. The air conditioning system according to claim 1, characterized in that: The air conditioning system further includes a communication power supply, which includes an L line and an N line connected to the current loop communication circuit on the indoor side and is used to provide a clamping voltage to the current loop communication circuit.

6. The air conditioning system according to claim 5, characterized in that: The communication power supply includes a first resistor, a second resistor, a first diode, a clamping capacitor and a Zener diode. The clamping capacitor is arranged on the indoor side of the N line of the current loop communication circuit. The clamping capacitor, the Zener diode and the first resistor are connected in parallel. The positive electrode of the Zener diode is connected to the L line of the current loop communication circuit through the second resistor and the first diode, and the negative electrode of the Zener diode provides a clamping voltage.

7. The air conditioning system according to any one of claims 1 to 6, characterized in that: The first switch is a low power relay, and the second switch is a high power relay.

8. The air conditioning system according to claim 4, characterized in that: The first switching power supply also includes a second diode, the positive electrode of the secondary side of the first transformer is connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the main control chip of the outdoor main control board through the voltage conversion circuit.

9. The air conditioning system according to claim 1, characterized in that: The current loop communication circuit is connected to the AC input terminal of the second switch power supply of the indoor main control board through the L line and the N line on the indoor side.

10. The air conditioning system according to claim 9, characterized in that: The second switching power supply includes a second rectifier bridge circuit and a second transformer, one end of the capacitor component of the second switching power supply is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the second switching power supply is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the second switching power supply is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the main control chip of the indoor main control board.

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