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 power supply switch is arranged on the outdoor side and is arranged between the L line of the current loop communication circuit and the alternating current input end of the first switching power supply; the resistance-capacitance module is connected with an S line of the current loop communication circuit and a capacitor assembly of the first switching power supply on the outdoor side; the input end of the frequency modulation module is connected with the L line of the current loop communication circuit on the indoor side, and the output end of the frequency modulation module is connected with the S line of the current loop communication circuit on the indoor side; and 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 resistance-capacitance module, 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. According to the air conditioning system, the space for arranging elements on the indoor main control board can be saved.

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] Inverter split air conditioners, the communication method between the indoor unit and the outdoor unit 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 have large size and height, making it difficult to miniaturize the relays. Summary of the invention

[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 power 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;

[0007] A resistance-capacitance module, 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;

[0008] A frequency modulation module, wherein the input end of the frequency modulation module is connected to the L line of the current loop communication circuit on the indoor side, and the output end of the frequency modulation module is connected to the S line of the current loop communication circuit on the indoor side; when the power switch is disconnected and the frequency of the output end of the frequency modulation module is higher than a preset frequency value, 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 resistor-capacitor module, so as to start the outdoor main control board 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, the first rectifier bridge circuit is connected to the primary side of the first transformer, the capacitor component of the first switching power supply is connected in parallel with the secondary side of the first transformer, the connection point between the capacitor component of the first switching power supply and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board, and the primary side and the secondary side of the first transformer are grounded in common.

[0010] In some embodiments, the RC module includes a RC capacitor and a voltage-divider resistor, and the RC capacitor is connected in series with the voltage-divider resistor; at the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the RC capacitor and the impedance of the voltage-divider resistor cooperate to limit the voltage across the capacitor component of the first switching power supply to be lower than the starting voltage of the outdoor main control board.

[0011] In some embodiments, the first switching power supply further includes a first diode, the positive electrode of the secondary side of the first transformer is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the negative electrode of the secondary side of the first transformer through a capacitor component of the first switching power supply.

[0012] 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.

[0013] In some embodiments, the RC module includes a RC capacitor and a voltage-divider resistor, and the RC capacitor is connected in series with the voltage-divider resistor; at the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the RC capacitor and the impedance of the voltage-divider resistor cooperate to limit the voltage across the capacitor component of the first switching power supply so that the voltage provided by the secondary side of the first transformer is lower than the starting voltage of the outdoor main control board.

[0014] In some embodiments, a control switch is further included, and the control switch is arranged on the outdoor side between the resistor-capacitor module and the capacitor component of the first switching power supply.

[0015] In some embodiments, the air conditioning system further includes a communication power supply, and the communication power supply 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.

[0016] In some embodiments, the communication power supply includes a first resistor, a second resistor, a second diode, a clamping capacitor and a first 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 first zener diode and the first resistor are connected in parallel. The positive electrode of the first zener diode is connected to the L line of the current loop communication circuit through the second resistor and the second diode. The negative electrode of the first zener diode provides a clamping voltage.

[0017] In some embodiments, the frequency modulation module is a solid-state relay, which is used to adjust the frequency of the output end by changing the internal switching frequency, and the power supply switch is a high-power relay.

[0018] 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 frequency modulation module on the indoor side, the frequency modulation module is connected to the L line and the S line of the current loop communication circuit on the indoor side, the air conditioning system is also provided with a resistance and capacitance module on the outdoor side to connect the S line and the capacitor component of the first switching power supply, and the first capacitor component is connected to the N line through the AC input end of the first switching power supply when the power switch is disconnected, thereby forming an energy charging circuit from the L line of the current loop communication circuit-the frequency modulation module-the S line-the resistance and capacitance module-the capacitor component of the first switching power supply-the N line, and utilizing the characteristics of the resistance and capacitance module that the capacitive reactance is larger at low frequencies and smaller at high frequencies, the frequency modulation module is used when the energy charging circuit is not needed to work. The block does not adjust the frequency between the L line and the N line, so that the capacitor component of the first switching power supply cannot be charged to the required voltage. When the outdoor main control board needs to be awakened, the output end of the frequency modulation module outputs the increased frequency, which can charge the capacitor component of the first switching power supply, and then use the voltage across the capacitor component of the first switching power supply 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 RC module and the frequency modulation module are provided with a voltage divider, the power that the frequency modulation module needs to withstand is reduced, and the frequency modulation module does not need to use large-volume devices such as high-power relays, which can save space for layout components on the indoor main control board, and the cost of the indoor main control board can also be lower.

[0019] 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

[0020] Figure 1 is a circuit diagram of an air conditioning system provided in an embodiment of the present application;

[0021] Figure 2 It is a circuit diagram of the current flow during the wake-up process of the outdoor main control board of the air-conditioning system provided by the embodiment of the present application;

[0022] Figure 3 is a circuit diagram of another air conditioning system provided in an embodiment of the present application;

[0023] Figure 4 is a circuit diagram of another air conditioning system provided in an embodiment of the present application;

[0024] Figure 5 It is a circuit diagram of the current flow during the communication process of the current loop communication circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. 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. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0026] 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.

[0027] 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).

[0028] For variable frequency split air conditioners, the communication method between the indoor unit and the outdoor unit is mostly current loop communication. The current loop communication method can realize the power supply and communication between the indoor unit and the outdoor unit through the three power lines of the AC power live line L line, the neutral line N line, and the communication line S line. This communication method 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 to the outdoor unit, and in the standby state, the power supply to the outdoor unit is disconnected, so that the power consumption of the whole machine is reduced during standby. If cooling or heating is required in the standby state, the indoor unit main control board controls the high-power relay to attract, supply power to the outdoor unit and wake up the outdoor main control board.

[0029] As air conditioners have more and more additional functions, the number of components stored in the main control board of the indoor unit of the air conditioner has also increased. In order to arrange more components in a limited space on the indoor main control board, the components usually need to be miniaturized. However, a high-power relay controls the power supply of the entire outdoor unit, withstands a large power, and has a large size and height, making it difficult to miniaturize the relay.

[0030] It can be seen that in the related art, a high-power relay is usually set in the main control board of the indoor unit of the air conditioner to achieve low-power standby, and when the outdoor unit needs to enter the working state, the indoor unit main control board controls the high-power relay to be attracted, supplying power to the outdoor unit and waking up the outdoor main control board. However, the current high-power relay is large in size and height, occupies a large space on the indoor unit main control board, and the cost of the high-power relay is high, which does not meet the production requirements of miniaturization and low cost of air conditioners.

[0031] Based on this, the present embodiment provides an air-conditioning system. In terms of circuit structure, the air-conditioning system based on the current loop communication circuit is provided with a frequency modulation module on the indoor side. The frequency modulation module is connected to the L line and the S line of the current loop communication circuit on the indoor side. The air-conditioning system is also provided with a resistor-capacitor module on the outdoor side to connect the S line and the capacitor component of the first switching power supply. When the power switch is disconnected, the first capacitor component is connected to the N line through the AC input end of the first switching power supply. Thus, a charging circuit is formed from the L line of the current loop communication circuit-the frequency modulation module-the S line-the resistor-capacitor module-the capacitor component of the first switching power supply-the N line. The characteristics of the resistor-capacitor module that the capacitive reactance is larger at low frequencies and smaller at high frequencies are utilized. When the charging circuit is not needed to work, The frequency modulation module does not adjust the frequency between the L line and the N line, so that the capacitor component of the first switching power supply cannot be charged to the required voltage. When the outdoor main control board needs to be awakened, the output end of the frequency modulation module outputs the increased frequency, which can charge the capacitor component of the first switching power supply, and then use the voltage across the capacitor component of the first switching power supply 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 resistor-capacitor module and the frequency modulation module are provided with a voltage divider, the power that the frequency modulation module needs to withstand is reduced, and the frequency modulation module does not need to use large-volume devices such as high-power relays, which can save space for layout components on the indoor main control board, and the cost of the indoor main control board can also be lower.

[0032] The air conditioning system is described in detail below with reference to the accompanying drawings:

[0033] Reference Figure 1 As shown, Figure 1 : is a circuit diagram of an air conditioning system provided by an embodiment of the present application. A current loop communication circuit is provided between the indoor main control board and the outdoor main control board of the air conditioning system of the embodiment of the present application, and the current loop communication circuit is connected to the AC input terminal of the first switch power supply 300 of the outdoor main control board through the L line and the N line on the outdoor side; the air conditioning system also includes:

[0034] The power switch RY1 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 300;

[0035] The RC module 100 is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply 300 at the outdoor side;

[0036] The frequency modulation module 200 has an input end connected to the L line of the current loop communication circuit on the indoor side, and an output end of the frequency modulation module 200 is connected to the S line of the current loop communication circuit on the indoor side; when the power switch RY1 is disconnected and the frequency of the output end of the frequency modulation module 200 is higher than the preset frequency value, a charging circuit for charging the capacitor component of the first switching power supply 300 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 resistor-capacitor module 100, so as to use the voltage across the capacitor component of the first switching power supply 300 to start the outdoor main control board.

[0037] In some embodiments of the present application, a current loop communication circuit is set between the indoor main control board and the outdoor main control board of the air-conditioning system, and the current loop communication circuit includes a power live wire L line, a neutral wire N line, and a communication wire S line. The current loop communication method can realize power supply and communication between the indoor unit and the outdoor unit through the three power lines of the AC power live wire L line, the neutral wire N line, and the communication wire S line, and the communication method has strong anti-interference ability and low cost; the current loop communication circuit is connected to the AC input end of the first switching power supply 300 of the outdoor main control board through the L line and the N line on the outdoor side, and the air-conditioning system also includes a power supply switch RY1, a resistor-capacitor module 100 and a frequency modulation module Block 200; the power switch RY1 is arranged on the outdoor side, and the power switch RY1 is arranged between the L line of the current loop communication circuit and the AC input end of the first switching power supply 300; the resistor-capacitor module 100 is arranged on the outdoor side, and the resistor-capacitor module 100 is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply 300; the frequency modulation module 200 is arranged on the indoor side, and the input end of the frequency modulation module 200 is connected to the L line of the current loop communication circuit on the indoor side, and the output end of the frequency modulation module 200 is connected to the S line of the current loop communication circuit on the indoor side, therefore, the frequency modulation module 200 is connected to the L line and the S line of the current loop communication circuit on the indoor side. In the standby state, the power switch RY1 is in the disconnected state, and the frequency of the output end of the frequency modulation module 200 is lower than the preset frequency value, thereby realizing low-energy standby; when the outdoor unit needs to enter the working state, the frequency of the output end of the frequency modulation module 200 is adjusted to be higher than the preset frequency value. When the power switch RY1 is disconnected, the L line and the N line of the current loop communication circuit can form an energy charging circuit for charging the capacitor component of the first switching power supply 300 through the S line of the current loop communication circuit and the resistor-capacitor module 100, and the outdoor main control board is started by the voltage across the capacitor component of the first switching power supply 300.

[0038] It can be seen that in the present application, when the power switch RY1 is disconnected, the first capacitor C1 component is connected to the N line through the AC input end of the first switching power supply 300, thereby forming a charging circuit from the L line of the current loop communication circuit-the frequency modulation module 200-S line-the resistance and capacitance module 100-the capacitor component of the first switching power supply 300-the N line. By utilizing the characteristics of the resistance and capacitance module 100 that the capacitive reactance is larger at low frequencies and smaller at high frequencies, in the standby state, the frequency modulation module 200 does not adjust the frequency between the L line and the N line, so that the frequency of the output end of the frequency modulation module 200 is lower than the preset frequency value, so that the capacitor component of the first switching power supply 300 cannot be charged to the required voltage, so the outdoor main control board is not powered. The standby power consumption is reduced. When the outdoor main control board needs to be awakened, the output end of the frequency modulation module 200 outputs a frequency higher than the preset frequency value, which can charge the capacitor component of the first switching power supply 300, and then use the voltage across the capacitor component of the first switching power supply 300 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 resistor-capacitor module 100 and the frequency modulation module 200 are provided with a voltage divider, the power that the frequency modulation module 200 needs to withstand is reduced, and the frequency modulation module 200 does not need to use large-volume devices such as high-power relays, thereby reducing the cost of the indoor main control board and saving space for layout components on the indoor main control board, which meets the needs of miniaturization of air conditioner production.

[0039] In some embodiments of the present application, the current loop communication method can realize power supply and communication between the indoor unit and the outdoor unit through three power lines, namely, the live line L line, the neutral line N line, and the communication line S line of the AC power supply. L1, N1, and S1 are wiring terminals at the indoor main control board, and L2, N2, and S2 are wiring terminals at the outdoor board.

[0040] In one embodiment, the frequency modulation module 200 is a solid-state relay, which is used to adjust the frequency of the output end by changing the internal switching frequency. The power switch RY1 is a high-power relay, and the power switch RY1 is a single-pole single-throw main relay. In the embodiment of the present application, the indoor main control board uses a low-power single-channel solid-state relay as the frequency modulation module 200 to control the frequency value output by the output end of the frequency modulation module 200 to be higher than the preset frequency value, so that a charging loop is formed and the capacitor component of the first switching power supply 300 is charged through the charging loop, and the outdoor main control board is started by the voltage across the capacitor component of the first switching power supply 300. Therefore, the indoor main control board of the present application only needs to use a low-power single-channel solid-state relay as a switching unit, and the outdoor main control board only needs a single-pole single-throw main relay to wake up the outdoor main control board in the power-off mode, without using a high-power relay, which can save space for layout components on the indoor main control board and reduce costs.

[0041] In some embodiments of the present application, the first switching power supply 300 includes a capacitor component, a first rectifier bridge circuit and a first transformer TR1, the first rectifier bridge circuit is connected to the primary side of the first transformer TR1, the capacitor component of the first switching power supply 300 is connected in parallel with the secondary side of the first transformer TR1, the connection point between the capacitor component of the first switching power supply 300 and the secondary side of the first transformer TR1 is connected to the main control chip of the outdoor main control board, and the primary side and the secondary side of the first transformer TR1 are grounded. When the power switch RY1 is disconnected, the first capacitor C1 component is connected to the N line through the first rectifier bridge circuit of the first switching power supply 300, forming an energy charging circuit from the L line of the current loop communication circuit-frequency modulation module 200-S line-resistance and capacitance module 100-capacitor component of the first switching power supply 300-N line, thereby realizing the energy charging circuit to charge the capacitor component of the first switching power supply 300, so that the voltage across the capacitor component of the first switching power supply 300 meets the starting voltage of the outdoor main control board. Since the secondary side of the first transformer TR1 is connected in parallel with the capacitor component of the first switching power supply 300, the secondary side of the first transformer TR1 can play a voltage dividing role. The voltage across the capacitor component of the first switching power supply 300 is adjusted by adjusting the voltage output by the secondary side of the first transformer TR1, which effectively avoids excessive voltage on both sides of the capacitor component of the first switching power supply 300, thereby preventing the capacitor component of the first switching power supply 300 from being damaged, thereby improving the safety of the charging circuit.

[0042] In some embodiments of the present application, the capacitor component of the first switching power supply 300 is on the secondary side of the first transformer TR1, and the capacitor component of the first switching power supply 300 includes a first capacitor C1, a second voltage stabilizing diode DZ2 and a third resistor R3, the third resistor R3 is connected in parallel with the first capacitor C1, the second voltage stabilizing diode DZ2 is connected in parallel with the first capacitor C1, and the negative electrode of the second voltage stabilizing diode DZ2 is connected to the main control chip of the outdoor main control board, and the L line and the N line of the current loop communication circuit are connected through the S line of the current loop communication circuit and the resistor-capacitor module 100 to form an energy charging circuit to the first capacitor C1, so that the energy charging circuit charges the first capacitor C1, and the voltage across the first capacitor C1 is used to start the outdoor main control board. By setting the third resistor R3 in parallel with the first capacitor C1, the third resistor R3 plays a voltage dividing role, which can effectively avoid the problem of the first capacitor C1 being broken down due to the excessively high frequency output by the frequency modulation module 200, thereby improving the safety of the energy charging circuit. By setting the second voltage stabilizing diode DZ2 and the first capacitor C1 in parallel, the voltage across the first capacitor C1 can be stabilized. The cathode of the second voltage stabilizing diode DZ2 is connected to the main control chip of the outdoor main control board, so that the voltage across the first capacitor C1 provides a stable voltage for the main control chip of the outdoor main control board after passing through the second voltage stabilizing diode DZ2, thereby improving the stability of the charging circuit.

[0043] In some embodiments of the present application, the first switching power supply 300 further includes a first diode D1, the positive electrode of the secondary side of the first transformer TR1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the negative electrode of the secondary side of the first transformer TR1 through the capacitor component of the first switching power supply 300. The first diode D1 is provided on the secondary side of the first transformer TR1 to limit the unidirectional conduction of the current, so that the current in the charging loop flows through the resistor-capacitor module 100 and then flows into the capacitor component of the first switching power supply 300 to charge the first capacitor C1, preventing the current from flowing into the first transformer TR1, protecting the first transformer TR1, avoiding component damage, and improving the safety of the first switching power supply 300.

[0044] In some embodiments of the present application, the first switching power supply 300 further includes a second capacitor C2 and a first voltage conversion module 310, the second capacitor C2 and the first voltage conversion module 310 are connected in parallel, the input end of the first voltage conversion module 310 is connected to the negative electrode of the second voltage stabilizing diode DZ2, and the output end of the first voltage conversion module 310 is connected to the outdoor main control board. By setting the first voltage conversion module 310 in the first switching power supply 300, the voltage at both ends of the resistor-capacitor module 100 of the first switching power supply 300 can be converted into a preset voltage value, so that the voltage output at the output end of the first voltage conversion module 310 meets the startup voltage of the outdoor main control board, thereby allowing the outdoor main control board to work normally. By setting the second capacitor C2 in the first switching power supply 300, the second capacitor C2 can be used to smooth the fluctuations in the voltage output at the output end of the first voltage conversion module 310, and can reduce noise, so that the voltage output at the output end of the first voltage conversion module 310 is more stable.

[0045] In some embodiments of the present application, the first rectifier bridge circuit includes a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6 and a third capacitor C3, the positive electrode of the third diode D3 is connected to the N line of the current loop communication circuit, the negative electrode of the third diode D3 is connected to the positive electrode of the fourth diode D4 through the third capacitor C3, the negative electrode of the fourth diode D4 is connected to the L line of the current loop communication circuit through the power supply switch RY1, the positive electrode of the fifth diode D5 is connected to the L line of the current loop communication circuit through the power supply switch RY1, the negative electrode of the third diode D3 is connected to the positive electrode of the sixth diode D6 through the third capacitor C3, and the negative electrode of the sixth diode D6 is connected to the N line of the current loop communication circuit. By setting the first rectifier bridge circuit to be connected to the secondary side of the first transformer TR1, when the AC voltage on the primary side of the first transformer TR1 is in the negative half cycle, the loop between the third diode D3-the third capacitor C3-the fourth diode D4 is turned on; when the AC voltage on the primary side of the first transformer TR1 is in the positive half cycle, the loop between the fifth diode D5-the third capacitor C3-the sixth diode D6 is turned on, thereby ensuring that the current flows in only one direction on the load, thereby realizing the rectification function.

[0046] In some embodiments of the present application, the first switching power supply 300 further includes a first transistor Q1, the drain of the first transistor Q1 is connected to the positive electrode of the primary side of the first transformer TR1, and the source of the first transistor Q1 is connected to the negative electrode of the primary side of the first transformer TR1. By arranging the first transistor Q1 in the first switching power supply 300, the first transistor Q1 and the primary side of the first transformer TR1 are connected to form a voltage stabilizing circuit to maintain the stability of the output voltage of the primary side of the first transformer TR1; the first transistor Q1 and the primary side of the first transformer TR1 are connected in the first switching power supply 300 to form a protection circuit. When the current is too large, the first transistor Q1 can provide overcurrent protection to avoid component damage.

[0047] In some embodiments of the present application, the RC module 100 is arranged on the outdoor side to connect the S line of the current loop communication circuit and the capacitor component of the first switch power supply 300; the RC module 100 includes a RC capacitor C0 and a voltage divider resistor R0, and the RC capacitor C0 is connected in series with the voltage divider resistor R0; one end of the voltage divider resistor R0 is connected to the S line of the current loop communication circuit, and the other end is connected to one end of the RC capacitor C0, and the other end of the RC capacitor C0 is connected to the capacitor component of the first switch power supply 300. Under the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the RC capacitor C0 and the impedance of the voltage divider resistor R0 cooperate to limit the voltage at both ends of the capacitor component of the first switch power supply 300 to be lower than the starting voltage of the outdoor main control board. By limiting the voltage at both ends of the capacitor component of the first switch power supply 300 to be lower than the starting voltage of the outdoor main control board, the L line and the N line of the current loop communication circuit can be prevented from forming a loop, so that only the indoor main control board has power, and the outdoor main control board is not powered, so that the outdoor unit enters the standby state, and low-power standby can be achieved. When the outdoor main control board needs to be awakened, the frequency outputted by the output terminal of the frequency modulation module 200 is adjusted to be higher than the preset value, so that the capacitor component of the first switching power supply 300 can be charged, and then the voltage across the capacitor component of the first switching power supply 300 is used to provide a working voltage to the main control chip of the outdoor main control board, thereby awakening the outdoor unit; by setting a resistor-capacitor module 100 and a voltage divider with the frequency modulation module 200 in the energy charging circuit, the power that the frequency modulation module 200 needs to withstand is reduced. Therefore, the frequency modulation module 200 does not need to use large-volume devices such as high-power relays, which can save space for layout components on the indoor main control board, and the cost of the indoor main control board can also be lower, while also reducing the energy consumption of the indoor main control board.

[0048] In some embodiments of the present application, the RC module 100 is used to block the 50Hz low-frequency mains current from flowing into the outdoor main control board, and the RC module 100 includes a RC capacitor C0 and a voltage-dividing resistor R0, wherein the RC capacitor C0 is a safety capacitor that withstands high voltage, and has the characteristics of large capacitive reactance at low frequency and small capacitive reactance at high frequency. According to the characteristics of the RC capacitor C0 that the capacitive reactance is large at low frequency and small capacitive reactance at high frequency, after the mains power passes through the RC capacitor C0 and the voltage-dividing resistor R0, the voltage generated on the secondary side of the first transformer TR1 of the first switching power supply 300 cannot drive the outdoor main control board to work. Therefore, the outdoor main control board is not powered, so that the outdoor unit enters the standby state, and low-power standby can be achieved. In addition, even if the 50Hz mains power flows into the frequency modulation module 200 so that the frequency modulation module 200 is in the on state, the outdoor main control board will not be powered without adjusting the frequency of the RC module 100 between the L line and the N line. When the outdoor main control board needs to be awakened, the frequency outputted from the output end of the frequency modulation module 200 needs to be adjusted higher than the preset frequency value. The capacitive reactance of the resistor-capacitor C0 will become lower under high frequency state. Therefore, the frequency outputted from the output end of the frequency modulation module 200 is increased. The capacitive reactance of the resistor-capacitor C0 can be lowered, thereby charging the capacitor component of the first switching power supply 300. Then, the voltage across the capacitor component of the first switching power supply 300 is used to provide the working voltage for the main control chip of the outdoor main control board, thereby awakening the outdoor unit.

[0049] In some embodiments of the present application, the preset frequency value is 50Hz. When the frequency outputted from the output terminal of the frequency modulation module 200 is higher than 50Hz, the capacitive reactance of the resistor-capacitor capacitor C0 becomes low, so that the capacitor component of the first switching power supply 300 is charged, and then the voltage across the capacitor component of the first switching power supply 300 is used to provide the main control chip of the outdoor main control board with a working voltage to wake up the outdoor unit. The preset frequency value can be one of 51Hz, 53Hz, and 55Hz. Those skilled in the art can set the size of the preset frequency value according to actual conditions. The embodiment of the present application does not limit the size of the preset frequency value.

[0050] In some embodiments of the present application, when the indoor main control board needs to wake up the outdoor main control board in the power-off state, it is necessary to control the frequency outputted by the output terminal of the frequency modulation module 200 to be greater than the preset frequency value, and the charging time of the capacitor component of the first switching power supply 300 can be adjusted according to the actual situation. The higher the frequency of the output terminal of the frequency modulation module 200, the shorter the charging time required for the capacitor component of the first switching power supply 300, and the lower the frequency of the output terminal of the frequency modulation module 200, the longer the charging time required for the capacitor component of the first switching power supply 300. Figure 2 As shown, when the charging circuit charges the capacitor component of the first switching power supply 300, the current flows as follows:

[0051] The current flows into the frequency modulation module 200 from the L1 terminal and then flows out, flows from the S1 terminal through the S2 terminal, flows to the RC module 100 and then flows into the capacitor component of the first switching power supply 300, then flows into the first rectifier bridge circuit after passing through the thermal ground DC_N, and flows out from the negative electrode of the first rectifier bridge circuit. The current flows from the negative electrode of the first rectifier bridge circuit through the N2 terminal and then flows to the N1 terminal, completing the charging process of the capacitor component of the first switching power supply 300, and using the voltage across the capacitor component of the first switching power supply 300 to start the outdoor main control board.

[0052] Reference Figure 3 As shown, Figure 3 It is a circuit diagram of another air-conditioning system provided in an embodiment of the present application. The first switching power supply 300 includes a first rectifier bridge circuit and a first transformer TR1. One end of the capacitor component of the first switching power supply 300 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 300 is connected to the negative output end of the first rectifier bridge circuit. The capacitor component of the first switching power supply 300 is connected to the primary side of the first transformer TR1, and the secondary side of the first transformer TR1 is connected to the main control chip of the outdoor main control board.

[0053] In some embodiments of the present application, the first rectifier bridge circuit includes a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6 and a third capacitor C3, the positive electrode of the third diode D3 is connected to the N line of the current loop communication circuit, the negative electrode of the third diode D3 is connected to the positive electrode of the fourth diode D4 through the third capacitor C3, the negative electrode of the fourth diode D4 is connected to the L line of the current loop communication circuit through the power supply switch RY1, the positive electrode of the fifth diode D5 is connected to the L line of the current loop communication circuit through the power supply switch RY1, the negative electrode of the third diode D3 is connected to the positive electrode of the sixth diode D6 through the third capacitor C3, and the negative electrode of the sixth diode D6 is connected to the N line of the current loop communication circuit. By setting the capacitor component of the first switching power supply 300 to be connected to the primary side of the first transformer TR1, and connecting one end of the capacitor component of the first switching power supply 300 to the positive output end of the first rectifier bridge circuit, and connecting the other end of the capacitor component of the first switching power supply 300 to the negative output end of the first rectifier bridge circuit, when the AC voltage on the primary side of the first transformer TR1 is in the negative half cycle, the loop between the third diode D3-the third capacitor C3-the fourth diode D4 is turned on; when the AC voltage on the primary side of the first transformer TR1 is in the positive half cycle, the loop between the fifth diode D5-the third capacitor C3-the sixth diode D6 is turned on, thereby charging the third capacitor C3, and ensuring that the current flows in only one direction on the load, thereby realizing the rectification function.

[0054] It should be noted that since the capacitor component of the first switching power supply 300 is connected to the primary side of the first transformer TR1, and the secondary side of the first transformer TR1 is connected to the main control chip of the outdoor main control board, the voltage across the third capacitor C3 is stepped down through the primary side of the first transformer TR1, and the stepped-down voltage is transmitted to the secondary side of the first transformer TR1, so that the secondary side of the first transformer TR1 provides voltage for the main control chip of the outdoor main control board to start the outdoor control board.

[0055] In some embodiments of the present application, the first switching power supply 300 further includes a first transistor Q1, the drain of the first transistor Q1 is connected to the positive electrode of the primary side of the first transformer TR1, and the source of the first transistor Q1 is connected to the negative electrode of the primary side of the first transformer TR1. By arranging the first transistor Q1 in the first switching power supply 300, the first transistor Q1 and the primary side of the first transformer TR1 are connected to form a voltage stabilizing circuit to maintain the stability of the output voltage of the primary side of the first transformer TR1; the first transistor Q1 and the primary side of the first transformer TR1 are connected in the first switching power supply 300 to form a protection circuit. When the current is too large, the first transistor Q1 can provide overcurrent protection to avoid component damage.

[0056] In some embodiments of the present application, the first switching power supply 300 includes a first transformer TR1 and a first rectifier bridge circuit, and also includes a first diode D1, a third resistor R3, a first capacitor C1, a second Zener diode DZ2, a first voltage conversion module 310 and a second capacitor C2, the third resistor R3 and the first capacitor C1 are connected in parallel, the second Zener diode DZ2 and the first capacitor C1 are connected in parallel, the second capacitor C2 and the first voltage conversion module 310 are connected in parallel, and the negative electrode of the second Zener diode DZ2 is connected to the input end of the first voltage conversion module 310, and the output end of the first voltage conversion module 310 is connected to the main control chip of the outdoor main control board. By setting the first diode D1 on the first switching power supply 300, the current can be limited to be unidirectional, so that the current flowing out from the primary side of the first transformer TR1 flows to the first voltage conversion module 310 after passing through the first diode D1, so that the first voltage conversion module 310 is in a conducting state, and the first voltage conversion module 310 converts the voltage across the second voltage stabilizing diode DZ2 into a preset voltage value, so that the voltage outputted from the output end of the first voltage conversion module 310 meets the startup voltage of the outdoor main control board, so that the outdoor main control board can work normally. By setting the second capacitor C2 on the first switching power supply 300, the second capacitor C2 can be used to smooth the fluctuations in the voltage outputted from the output end of the first voltage conversion module 310, and can reduce noise, so that the voltage outputted from the output end of the first voltage conversion module 310 is more stable.

[0057] In some embodiments of the present application, the RC module 100 includes a RC capacitor C0 and a voltage-dividing resistor R0, and the RC capacitor C0 is connected in series with the voltage-dividing resistor R0; at the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the RC capacitor C0 and the impedance of the voltage-dividing resistor R0 cooperate to limit the voltage across the capacitor component of the first switching power supply 300 so that the voltage provided by the secondary side of the first transformer TR1 is lower than the starting voltage of the outdoor main control board.

[0058] In one embodiment, the capacitor component of the first switching power supply 300 is a third capacitor C3, and the resistor-capacitor module 100 is arranged on the outdoor side to connect the S line of the current loop communication circuit and the third capacitor C3; the resistor-capacitor capacitor C0 is connected in series with the voltage-dividing resistor R0; specifically, one end of the voltage-dividing resistor R0 is connected to the S line of the current loop communication circuit, and the other end is connected to one end of the resistor-capacitor capacitor C0, and the other end of the resistor-capacitor capacitor C0 is connected to the third capacitor C3. Under the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the resistor-capacitor capacitor C0 and the impedance of the voltage-dividing resistor R0 cooperate to limit the voltage across the third capacitor C3 to limit the voltage on the primary side of the first transformer TR1, thereby limiting the voltage provided by the secondary side of the first transformer TR1 to be lower than the starting voltage of the outdoor main control board, so that the L line and the N line of the current loop communication circuit do not form a loop, so that the outdoor main control board cannot be powered on, and the outdoor unit enters the standby state, realizing low-power standby. When the outdoor main control board needs to be awakened, the frequency output of the output terminal of the frequency modulation module 200 is adjusted to be higher than the preset value, so that the current flows out from the L line of the current loop communication circuit, and flows into the third capacitor C3 of the first switch power supply 300 after passing through the frequency modulation module 200, the S line, and the resistor-capacitor module 100 in sequence, so that the charging circuit charges the third capacitor C3 of the first switch power supply 300, and the third capacitor C3 is connected in parallel with the primary side of the first transformer TR1, and the voltage across the third capacitor C3 is used to provide a voltage for the secondary side of the first transformer TR1, and the secondary side of the first transformer TR1 provides a working voltage to the main control chip of the outdoor main control board with the voltage dropped, so as to wake up the outdoor unit. The present application reduces the power that the frequency modulation module 200 needs to bear by setting the resistor-capacitor module 100 and the frequency modulation module 200 to divide the voltage in the charging circuit. Therefore, the frequency modulation module 200 does not need to use large-volume devices such as high-power relays, which can save space for layout components on the indoor main control board, and the cost of the indoor main control board can also be lower, while also reducing the energy consumption of the indoor main control board.

[0059] It should be noted that, in some embodiments of the present application, the third capacitor C3 is a high-voltage electrolytic capacitor. In the present application, the RC module 100 is connected to the primary side of the first transformer TR1 to realize the charging of the high-voltage electrolytic third capacitor C3. By limiting the voltage across the charging terminals of the high-voltage electrolytic third capacitor C3, the voltage provided by the secondary side of the first transformer TR1 is lower than the starting voltage of the outdoor main control board.

[0060] In some embodiments of the present application, the RC module 100 is used to block the 50Hz low-frequency mains current from entering the outdoor main control board, and the RC module 100 includes a RC capacitor C0 and a voltage-dividing resistor R0, wherein the RC capacitor C0 is a safety capacitor that can withstand high voltage, and has the characteristics of large capacitive reactance at low frequency and small capacitive reactance at high frequency. According to the characteristics of the RC capacitor C0 that the capacitive reactance is large at low frequency and small at high frequency, after the mains power passes through the RC capacitor C0 and the voltage-dividing resistor R0, the voltage across the third capacitor C3 of the first switching power supply 300 makes the voltage provided by the secondary side of the first transformer TR1 lower than the starting voltage of the outdoor main control board, and the outdoor main control board cannot be driven to work. Therefore, the outdoor main control board is not powered, so that the outdoor unit enters the standby state, and low-power standby can be achieved.

[0061] In addition, even if the 50Hz mains electricity flows into the frequency modulation module 200 so that the frequency modulation module 200 is in the on state, the outdoor main control board will not be powered without adjusting the frequency of the resistor-capacitor module 100 between the L line and the N line. When the outdoor main control board needs to be awakened, the frequency outputted from the output end of the frequency modulation module 200 needs to be adjusted to be higher than the preset frequency value, and the capacitive reactance of the resistor-capacitor capacitor C0 will become lower in the high frequency state. Therefore, the frequency outputted from the output end of the frequency modulation module 200 after the increase can reduce the capacitive reactance of the resistor-capacitor capacitor C0, thereby charging the third capacitor C3 of the first switching power supply 300, and then using the voltage across the third capacitor C3 of the first switching power supply 300 to make the voltage provided by the secondary side of the first transformer TR1 meet the starting voltage of the outdoor main control board, thereby awakening the outdoor unit.

[0062] In some embodiments of the present application, the preset frequency value is 50Hz. When the frequency outputted from the output terminal of the frequency modulation module 200 is higher than 50Hz, the capacitive reactance of the resistor-capacitor capacitor C0 becomes low, so that the capacitor component of the first switching power supply 300 is charged, and then the voltage across the capacitor component of the first switching power supply 300 is used to provide the main control chip of the outdoor main control board with a working voltage to wake up the outdoor unit. The preset frequency value can be one of 51Hz, 53Hz, and 55Hz. Those skilled in the art can set the size of the preset frequency value according to actual conditions. The embodiment of the present application does not limit the size of the preset frequency value.

[0063] Reference Figure 4 As shown, Figure 4It is a circuit diagram of another air conditioning system provided by an embodiment of the present application, wherein a current loop communication circuit is arranged 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 switch power supply 300 of the outdoor main control board through an L line and an N line on the outdoor side; the air conditioning system further comprises a power switch RY1, which is arranged between the L line of the current loop communication circuit and the AC input terminal of the first switch power supply 300 on the outdoor side; a resistor-capacitor module 100, which is connected to a capacitor component of the S line of the current loop communication circuit and the first switch power supply 300 on the outdoor side; a frequency modulation module 200, The input end of the frequency modulation module 200 is connected to the L line of the current loop communication circuit on the indoor side, and the output end of the frequency modulation module 200 is connected to the S line of the current loop communication circuit on the indoor side; the resistance-capacitance module 100 includes a resistance-capacitance capacitor C0 and a voltage-dividing resistor R0, and the resistance-capacitance capacitor C0 is connected in series with the voltage-dividing resistor R0; under the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the resistance-capacitance capacitor C0 and the impedance of the voltage-dividing resistor R0 cooperate to limit the voltage across the capacitor component of the first switching power supply 300 so that the voltage provided by the secondary side of the first transformer TR1 is lower than the starting voltage of the outdoor main control board.

[0064] The air conditioning system also includes a control switch, which is arranged on the outdoor side between the RC module 100 and the capacitor component of the first switch power supply 300. By arranging the control switch between the RC module 100 and the capacitor component of the first switch power supply 300, when the outdoor unit needs to be on standby, the control switch is in an off state, so that a loop cannot be formed between the RC module 100 and the first switch power supply 300, so the RC module 100 cannot charge the capacitor component of the first switch power supply 300, and then the voltage across the capacitor component of the first switch power supply 300 can be limited so that the voltage provided by the secondary side of the first transformer TR1 is lower than the starting voltage of the outdoor main control board, so that the outdoor unit is in a standby state, reducing the power consumption of the air conditioning system. In addition, since the third capacitor C3 of the first switch power supply 300 is a high-voltage electrolytic capacitor, when the outdoor unit is on standby, the control switch is in an off state, avoiding the formation of the L line-frequency modulation module 200-S line-RC module 100-capacitor component of the first switch power supply 300-N line charging circuit of the current loop communication circuit, thereby improving the safety of the charging circuit in the standby state of the outdoor unit.

[0065] In some embodiments of the present application, the air conditioning system includes a first switching power supply 300, a power switch RY1, a resistor-capacitor module 100, and a frequency modulation module 200, and also includes a communication power supply 400. The communication power supply 400 includes an L line and an N line arranged on the indoor side, and the communication power supply 400 is connected to the current loop communication circuit. The communication power supply 400 is used to provide a clamping voltage to the current loop communication circuit. Specifically, the communication power supply 400 includes a first resistor R1, a second resistor R2, a second diode D2, a clamping capacitor, and a first voltage regulator diode DZ1. The clamping capacitor is on the indoor side, and the clamping capacitor is arranged on the N line of the current loop communication circuit. The clamping capacitor, the first voltage regulator diode DZ1, and the first resistor R1 are connected in parallel. The positive electrode of the first voltage regulator diode DZ1 is connected to the L line of the current loop communication circuit through the second resistor R2 and the second diode D2, and the negative electrode of the first voltage regulator diode DZ1 is used to provide a clamping voltage.

[0066] In some embodiments of the present application, a current loop communication circuit is set between the indoor main control board and the outdoor main control board of the air conditioning system. The current loop communication circuit is connected to the AC input terminal of the first switch power supply 300 of the outdoor main control board through the L line and the N line on the outdoor side. The current loop communication circuit is provided with an indoor data transmission optocoupler IC1, an indoor data receiving optocoupler IC3, an outdoor data receiving optocoupler IC4 and an outdoor data transmission optocoupler IC2. The indoor data transmission optocoupler IC1 is used for data transmission of the indoor main control board, the outdoor data transmission optocoupler IC2 is used for data transmission of the outdoor main control board, the indoor data receiving optocoupler IC3 is used for data reception of the indoor main control board, and the outdoor data receiving optocoupler IC4 is used for data reception of the outdoor main control board. When the outdoor main control board wakes up, the outdoor data receiving optocoupler IC4 will be attracted to wait for the command of the indoor main control board. The clamping capacitor of the communication power supply 400 is on the indoor side, and the clamping capacitor is set on the N line of the current loop communication circuit. One end of the clamping capacitor is connected to the indoor data transmission optocoupler IC1, and the other end of the clamping capacitor is connected to the diode of the outdoor data receiving optocoupler IC4.

[0067] When the outdoor main control board wakes up, the outdoor main control board and the indoor main control board will communicate with each other. The cathode of the first voltage stabilizing diode DZ1 is used to provide a clamping voltage. Figure 5 As shown, Figure 5 : is a circuit diagram of the current flow direction during the communication process of the current loop communication circuit provided by an embodiment of the present application. The current flow direction during the communication process of the current loop communication circuit is:

[0068] The current flows out from the cathode of the first voltage-stabilizing diode DZ1 of the communication power supply 400, passes through the N1 terminal of the N line to the N2 terminal, and then flows into the anode of the diode of the outdoor data receiving optocoupler IC4, and then flows from the diode of the outdoor data receiving optocoupler IC4 to the collector of the transistor of the outdoor data sending optocoupler IC2, and flows out from the emitter of the transistor of the outdoor data sending optocoupler IC2, and then flows from the anode of the twelfth diode D12 to the S1 terminal from the S2 terminal, and then flows through the anode of the thirteenth diode D13 to the anode of the indoor data receiving optocoupler IC3, and flows out from the cathode of the diode of the indoor data receiving optocoupler IC3, and finally flows to the collector of the transistor of the indoor data sending optocoupler IC1 to form a loop, completing a communication process. The impedance of the RC module 100 to the communication signal is much greater than the impedance when the indoor data receiving optocoupler IC3 and the indoor data sending optocoupler IC1 are turned on. Therefore, the RC module 100 will not affect the signal transmission between the current loop communication circuits.

[0069] In some embodiments of the present application, a current loop communication circuit is arranged on the indoor side, and the current loop communication circuit is connected to the AC input end of the control switch power supply 500 of the indoor main control board through the L line and the N line. The control switch power supply 500 is used to provide a working voltage for the frequency modulation module 200 so that the frequency modulation module 200 can work normally, ensuring that when the outdoor main control board needs to be awakened, the output end of the frequency modulation module 200 can work normally and output a frequency higher than a preset value, so that a charging circuit for charging the capacitor component of the first switch power supply 300 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 resistor-capacitor module 100, so as to use the voltage across the capacitor component of the first switch power supply 300 to start the outdoor main control board.

[0070] The control switch power supply 500 includes a second rectifier bridge circuit and a second transformer TR2, one end of the capacitor component of the control switch power supply 500 is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the control switch power supply 500 is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the control switch power supply 500 is connected to the primary side of the second transformer TR2, and the secondary side of the second transformer TR2 is connected to the main control chip of the indoor main control board.

[0071] The control switch power supply 500 also includes a second transistor Q2, which is arranged on the secondary side of the second transformer TR2, the drain of the second transistor Q2 is connected to the positive electrode of the secondary side of the second transformer TR2, and the negative electrode of the second transistor Q2 is connected to the negative electrode of the secondary side of the second transformer TR2. By arranging the second transistor Q2 in the control switch power supply 500, the second transistor Q2 is connected to the secondary side of the second transformer TR2 to form a voltage stabilizing circuit to maintain the stability of the output voltage of the secondary side of the second transformer TR2; in addition, the second transistor Q2 is connected to the secondary side of the second transformer TR2 to form a protection circuit, and when the current is too large, the second transistor Q2 can provide overcurrent protection to avoid component damage.

[0072] The control switch power supply 500 further includes a seventh diode D7, a fourth capacitor C4 and a second voltage conversion module 510. The seventh diode D7 and the fourth capacitor C4 are connected in parallel, the second voltage conversion module 510 and the fourth capacitor C4 are connected in parallel, and the anode of the seventh diode D7 is connected to the anode of the second transformer TR2, and the cathode of the seventh diode D7 is connected to the output end of the second voltage converter. By setting the anode of the seventh diode D7 to be connected to the anode of the second transformer TR2, the unidirectional conduction function of the current can be realized.

[0073] The second rectifier bridge circuit includes a fifth capacitor C5, an eighth diode D8, a ninth diode D9, a tenth diode D10 and an eleventh diode D11, the anode of the eighth diode D8 is connected to the N line, the cathode of the eighth diode D8 is connected to the anode of the ninth diode D9 through the fifth capacitor C5, the cathode of the ninth diode D9 is connected to the frequency modulation module 200, the anode of the tenth diode D10 is connected to the cathode of the eleventh diode D11 through the fifth capacitor C5, and the cathode of the eleventh diode D11 is connected to the N line.

[0074] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

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 power 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; A resistance-capacitance module, 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; A frequency modulation module, wherein the input end of the frequency modulation module is connected to the L line of the current loop communication circuit on the indoor side, and the output end of the frequency modulation module is connected to the S line of the current loop communication circuit on the indoor side; when the power switch is disconnected and the frequency of the output end of the frequency modulation module is higher than a preset frequency value, 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 resistor-capacitor module, so as to start the outdoor main control board 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, the first rectifier bridge circuit is connected to the primary side of the first transformer, the capacitor component of the first switching power supply is connected in parallel with the secondary side of the first transformer, the connection point between the capacitor component of the first switching power supply and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board, and the primary side and the secondary side of the first transformer are grounded.

3. The air conditioning system according to claim 2, characterized in that: The RC module includes a RC capacitor and a voltage-dividing resistor, and the RC capacitor is connected in series with the voltage-dividing resistor; at the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the RC capacitor and the impedance of the voltage-dividing resistor cooperate to limit the voltage across the capacitor component of the first switching power supply to be lower than the starting voltage of the outdoor main control board.

4. The air conditioning system according to claim 2, characterized in that: The first switching power supply further includes a first diode, the anode of the secondary side of the first transformer is connected to the anode of the first diode, and the cathode of the first diode is connected to the cathode of the secondary side of the first transformer through a capacitor component of the first switching power supply.

5. 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.

6. The air conditioning system according to claim 5, characterized in that: The RC module includes a RC capacitor and a voltage-dividing resistor, wherein the RC capacitor is connected in series with the voltage-dividing resistor; at the voltage frequency of the L line and the N line of the current loop communication circuit, the capacitive reactance of the RC capacitor and the impedance of the voltage-dividing resistor cooperate to limit the voltage across the capacitor component of the first switching power supply so that the voltage provided by the secondary side of the first transformer is lower than the starting voltage of the outdoor main control board.

7. The air conditioning system according to claim 6, characterized in that: It also includes a control switch, which is arranged on the outdoor side between the resistor-capacitor module and the capacitor component of the first switching power supply.

8. 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.

9. The air conditioning system according to claim 8, characterized in that: The communication power supply includes a first resistor, a second resistor, a second diode, a clamping capacitor and a first 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 first zener diode and the first resistor are connected in parallel. The positive electrode of the first zener diode is connected to the L line of the current loop communication circuit through the second resistor and the second diode. The negative electrode of the first zener diode provides a clamping voltage.

10. The air conditioning system according to any one of claims 1 to 9, characterized in that: The frequency modulation module is a solid-state relay, which is used to adjust the frequency of the output end by changing the internal switching frequency, and the power supply switch is a high-power relay.

11. 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 control switch power supply of the indoor main control board through the L line and the N line on the indoor side.

12. The air conditioning system according to claim 11, characterized in that: The control switch power supply includes a second rectifier bridge circuit and a second transformer, one end of the capacitor component of the control switch power supply is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the control switch power supply is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the control switch 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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