Air conditioning fan driving circuit, method, air conditioning system and equipment

Abstract

The present application relates to an air-conditioning fan driving circuit, method, air-conditioning system and equipment. The air-conditioning fan driving circuit includes: a Vienna rectifier coupled to a three-phase power supply, a detection module, a fan inverter module and a control module, and the output capacitor in the Vienna rectifier includes at least two voltage-dividing capacitors connected in series, and the voltage-dividing capacitor is connected in parallel with the fan inverter module through a DC bus, so that the fan inverter module can drive the air-conditioning fan according to the rectified signal output by the Vienna rectifier, and divide the voltage through the voltage-dividing capacitor, so that the withstand voltage level of the fan inverter module can be reduced, thereby greatly reducing the production cost of the system, and solving the high cost problem caused by the high withstand voltage level of the fan inverter module in the existing related technology.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioning fan driving circuit, method, air conditioning system and equipment. Background Art

[0002] With the rapid development of air-conditioning technology, an air-conditioning multi-fan system has emerged, that is, the same air-conditioning system contains at least two fans.

[0003] At present, three-phase power supply is usually used in air-conditioning multi-fan systems, which leads to a relatively high voltage of the DC bus in the air-conditioning multi-fan system, and a fan inverter module with a higher withstand voltage level is required to control the start and operation of the fan. However, as the number of fans used in air-conditioning systems increases, the withstand voltage level of the fan inverter module needs to be higher, which increases the production cost of the air-conditioning system. Summary of the invention

[0004] In view of this, the present application provides an air conditioning fan drive circuit, method, air conditioning system and equipment to solve the high cost problem caused by the high voltage resistance level of the fan inverter module in the existing related technology.

[0005] In a first aspect, an embodiment of the present application provides an air conditioner fan drive circuit, comprising: a Vienna rectifier coupled to a three-phase power supply, a detection module, a fan inverter module, and a control module;

[0006] Wherein, the output capacitor of the Vienna rectifier includes at least two voltage-dividing capacitors connected in series, and the voltage-dividing capacitor is connected in parallel with the fan inverter module through the DC bus of the air-conditioning fan drive circuit;

[0007] The detection module is used to detect the Vienna rectifier and generate a detection sampling signal corresponding to the Vienna rectifier, wherein the detection sampling signal includes a three-phase sampling signal and an output voltage signal;

[0008] The control module is used to determine the line state according to the three-phase sampling signal; if the line state is the first line state, a rectifier tube closing signal is output, and the rectifier tube closing signal is used to close all rectifier transistors in the Vienna rectifier; if the line state is the second line state, modulation is performed according to the three-phase sampling signal and the output voltage signal, and a three-phase modulated wave signal is output;

[0009] The Vienna rectifier is used to perform current rectification based on the three-phase power supply signal provided by the three-phase power supply in combination with the control signal output by the control module, and output a rectified signal, wherein the control signal includes the three-phase modulation wave signal and the rectifier tube closing signal;

[0010] The fan inverter module is used to drive the air-conditioning fan according to the rectified signal.

[0011] Optionally, the at least two voltage-dividing capacitors include a first capacitor and a second capacitor, and the Vienna rectifier includes three groups of single-phase rectifier circuits;

[0012] The first end of each group of single-phase rectifier circuits is electrically connected to the target single-phase power supply in the three-phase power supply through an inductor filter, the second end of each group of single-phase rectifier circuits is electrically connected to the first end of the first capacitor, the third end of each group of single-phase rectifier circuits is electrically connected to the second end of the second capacitor, the third end of each group of single-phase rectifier circuits is electrically connected to a voltage dividing node, and the control end of each group of single-phase rectifier circuits is electrically connected to the control output end of the control module, the control output end of the control module is used to output the rectifier tube shutdown signal or the three-phase modulation wave signal, and the voltage dividing node is a node where the first capacitor, the second capacitor and the single-phase rectifier circuit are connected.

[0013] Optionally, each group of single-phase rectification circuits includes the inductor filter, a first diode, a second diode and a single-phase rectification transistor;

[0014] The input end of the inductor filter is electrically connected to the target single-phase power supply, and the output end of the inductor filter is electrically connected to the anode of the first diode, the cathode of the second diode and the first end of the single-phase rectifier transistor, the cathode of the first diode is electrically connected to the first end of the first capacitor, the second end of the first capacitor is electrically connected to the first end of the second capacitor, the second end of the single-phase rectifier transistor and the voltage dividing node, and the control end of the single-phase rectifier transistor is electrically connected to the control output end of the control module.

[0015] Optionally, the single-phase rectifier transistor includes a first insulated gate bipolar transistor and a second insulated gate bipolar transistor having opposite control polarities;

[0016] A first end of the first insulated gate bipolar transistor is electrically connected to the output end of the inductor filter, the anode of the first diode, and the cathode of the second diode, a second end of the first insulated gate bipolar transistor is electrically connected to the second end of the second insulated gate bipolar transistor, and a first end of the second insulated gate bipolar transistor is electrically connected to the second end of the first capacitor, the first end of the second capacitor, and the voltage dividing node.

[0017] Optionally, the inductive filter includes a filter inductor and a resistor, the first end of the filter inductor is electrically connected to the target single-phase power supply, and the second end of the filter inductor is electrically connected to the anode of the first diode, the cathode of the second diode and the first end of the single-phase rectifier transistor through the resistor.

[0018] Optionally, the fan inverter module includes at least two inverters connected in series and the air-conditioning fans connected one by one to the inverters.

[0019] The control end of each inverter is electrically connected to the drive control end of the control module;

[0020] The control module is also used to output an inverter control signal according to the main control instruction;

[0021] The inverter is specifically configured to output a driving signal to the air-conditioning fan connected to the inverter according to the inverter control signal and based on the rectifier signal.

[0022] Optionally, the at least two voltage-dividing capacitors include a first capacitor and a second capacitor, the DC bus is divided into a first DC bus and a second DC bus, and the at least two inverters include a first inverter and a second inverter;

[0023] The first end of the first inverter is electrically connected to the first end of the first capacitor through the first DC bus, the second end of the first inverter is electrically connected to the first end of the second inverter, the second end of the second inverter is electrically connected to the second end of the second capacitor through the second DC bus, and the second end of the first capacitor is electrically connected to the first end of the second capacitor.

[0024] Optionally, the three-phase sampling signal includes a three-phase current signal, the output voltage signal includes a voltage signal of each voltage-dividing capacitor, and the detection module includes a voltage sampling circuit and a current sampling circuit;

[0025] The current sampling circuit is specifically used to sample and detect the input current of the Vienna rectifier to generate the three-phase current signal;

[0026] The voltage sampling circuit is specifically used to perform voltage detection on the voltage-dividing capacitor to generate a voltage signal of the voltage-dividing capacitor.

[0027] Optionally, the three-phase sampling signal also includes a three-phase voltage signal, and the voltage sampling circuit is specifically used to sample and detect the input voltage of the Vienna rectifier to generate the three-phase voltage signal.

[0028] In a second aspect, an embodiment of the present application provides an air-conditioning system, comprising an air-conditioning fan drive circuit as described in any one of the first aspect of the present application.

[0029] In a third aspect, an embodiment of the present application provides an air conditioner fan driving method, which is applied to the air conditioner fan driving circuit as described in any one of the first aspects of the present application, and the method includes:

[0030] Detecting the Vienna rectifier in the air conditioner fan drive circuit to generate a detection sampling signal corresponding to the Vienna rectifier, wherein the detection sampling signal includes a three-phase sampling signal and an output voltage signal;

[0031] Determining a line state according to the three-phase sampling signal;

[0032] If the line state is the first line state, a rectifier tube closing signal is output, and the rectifier tube closing signal is used to close all rectifier transistors in the Vienna rectifier;

[0033] If the line state is the second line state, modulating according to the three-phase sampling signal and the output voltage signal to generate a three-phase modulated wave signal, and outputting the three-phase modulated wave signal to the Vienna rectifier;

[0034] The Vienna rectifier is used to rectify current based on a three-phase power supply signal provided by a three-phase power supply, and output a rectified signal, and the rectified signal is used to drive the air-conditioning fan.

[0035] Optionally, determining the line state according to the three-phase sampling signal includes:

[0036] Calculating according to the three-phase sampling signal to obtain the bus current of the air conditioner fan drive circuit;

[0037] If the bus current is less than the preset switching current, determining the first line state as the line state;

[0038] If the bus current is greater than a preset switching current, the second line state is determined as the line state.

[0039] In a fourth aspect, an embodiment of the present application provides an air-conditioning device, comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; the memory is used to store computer programs; the processor is used to implement the steps of the air-conditioning fan driving method as described in any one of the third aspects of the present application when executing the program stored in the memory.

[0040] The air-conditioning fan driving circuit, method, air-conditioning system and equipment provided in the embodiments of the present application detect the Vienna rectifier through the detection module to generate a detection sampling signal, and the detection sampling signal includes a three-phase sampling signal and an output voltage signal, so that the control module can determine the line state according to the three-phase sampling signal, and output a rectifier tube closing signal when the line state is a first line state, and turn off all rectifier transistors in the Vienna rectifier. When the line state is a second line state, the three-phase sampling signal and the output voltage signal are modulated to output a three-phase modulated wave signal, which is transmitted to the Vienna rectifier, so that the Vienna rectifier can be based on the three-phase power supply signal provided by the three-phase power supply, combined with the control module The control signal output by the control module is rectified, and a rectified signal is output and transmitted to the fan inverter module, so that the fan inverter module can drive the air-conditioning fan according to the rectified signal to control the start-up and operation of the air-conditioning fan, thereby realizing the operation control of the air-conditioning fan, and the output capacitor in the Vienna rectifier includes at least two voltage-dividing capacitors connected in series, and the voltage-dividing capacitor is connected in parallel with the fan inverter module through the DC bus of the air-conditioning fan drive circuit to divide the voltage of the DC bus through the voltage-dividing capacitor, so that the voltage resistance level of the fan inverter module can be reduced, thereby greatly reducing the production cost of the system, and solving the high cost problem caused by the high voltage resistance level of the fan inverter module in the existing related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0044] Figure 1 A structural block diagram of an air conditioner fan drive circuit provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of an air conditioner fan drive circuit provided in an optional embodiment of the present application;

[0046] Figure 3A schematic diagram of the steps of a method for driving a fan circuit of an air conditioner provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of the structure of an air conditioning system provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of the structure of an air-conditioning device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0051] At present, from the perspective of the main loads in the air-conditioning system, the compressor consumes most of the energy, and the fan consumes a small part of the energy. In addition, the Vienna rectifier, as a high-efficiency, high-power power conversion circuit, can be used in the working condition of AC to DC conversion.

[0052] Based on the above, the embodiments of the present application provide an air-conditioning fan drive circuit, method, air-conditioning system and equipment, so as to use a Vienna rectifier in the air-conditioning system, realize the conversion of three-phase alternating current into direct current through the Vienna rectifier, and use a voltage-dividing capacitor to reduce the withstand voltage level of the fan inverter module, thereby greatly reducing the production cost of the system and solving the high cost problem caused by the high withstand voltage level of the fan inverter module in the existing related technology.

[0053] It should be noted that the air conditioning fan refers to the fan used in the air conditioning system, such as the fan in the air conditioning multi-fan system.

[0054] Figure 1 This is a structural block diagram of an air conditioner fan drive circuit provided in an embodiment of the present application. Figure 1As shown, the air-conditioning fan drive circuit provided by the embodiment of the present application may include: a Vienna rectifier 120 coupled to a three-phase power supply 110, a detection module 130, a fan inverter module 150 and a control module 140; wherein, the output capacitor of the Vienna rectifier 120 includes at least two voltage-dividing capacitors connected in series, and the voltage-dividing capacitor is connected in parallel with the fan inverter module 150 through the DC bus of the air-conditioning fan drive circuit, so that the fan inverter module 150 can drive the air-conditioning fan according to the rectified signal output after rectification by the Vienna rectifier 120, so as to realize the start-up and operation control of the air-conditioning fan, and can divide the voltage through the voltage-dividing capacitor, so that the withstand voltage level of the fan inverter module 150 can be reduced, thereby greatly reducing the production cost of the system, and solving the high cost problem caused by the high withstand voltage level of the fan inverter module in the existing related technology.

[0055] Specifically, the detection module 130 in the embodiment of the present application is used to detect the Vienna rectifier 120, generate a detection sampling signal corresponding to the Vienna rectifier 120, and transmit the detection sampling signal to the control module 140, so that the control module 140 can realize output control and signal modulation based on the detection sampling signal.

[0056] In one embodiment of the present application, the detection sampling signal corresponding to the Vienna rectifier 120 may include a three-phase sampling signal and an output voltage signal, so that the control module 140 can determine the line state according to the three-phase sampling signal, and output a rectifier tube shutdown signal when the line state is the first line state, shut down all the rectifier transistors in the Vienna rectifier 120, so that the Vienna rectifier 120 performs rectification in a passive LC manner; and when the line state is the second line state, modulate according to the three-phase sampling signal and the output voltage signal, output a three-phase modulation wave signal, and transmit the three-phase modulation wave signal to the Vienna rectifier 120, so that the Vienna rectifier 120 can modulate according to the three-phase modulation wave signal to achieve rectification output control. Wherein, the control module 140 is used to determine the line state according to the three-phase sampling signal; if the line state is the first line state, the rectifier tube shutdown signal is output, and the rectifier tube shutdown signal is used to shut down all the rectifier transistors in the Vienna rectifier 120; if the line state is the second line state, the three-phase sampling signal and the output voltage signal are used to output the rectifier tube shutdown signal. Enter The Vienna rectifier 120 is used to perform current rectification based on the three-phase power supply 110 signal provided by the three-phase power supply 110 and the control signal output by the control module 140, and output a rectified signal, wherein the control signal includes the three-phase modulated wave signal and the rectifier tube closing signal.

[0057] In summary, the air-conditioning fan drive circuit provided in the embodiment of the present application generates a detection sampling signal by detecting the Vienna rectifier 120 coupled to the three-phase power supply 110, and the detection sampling signal includes a three-phase sampling signal and an output voltage signal, so that the control module 140 can determine the line state according to the three-phase sampling signal, and output a rectifier tube closing signal when the line state is a first line state, and turn off all rectifier transistors in the Vienna rectifier 120, and when the line state is a second line state, modulate according to the three-phase sampling signal and the output voltage signal, output a three-phase modulated wave signal, and transmit it to the Vienna rectifier 120, so that the Vienna rectifier 120 can be based on the three-phase power supply 110 signal provided by the three-phase power supply 110. The control module 140 outputs a control signal to perform current rectification, output a rectified signal, and transmit it to the fan inverter module 150, so that the fan inverter module 150 can drive the air-conditioning fan according to the rectified signal to control the start-up and operation of the air-conditioning fan, and the output capacitor in the Vienna rectifier 120 includes at least two voltage-dividing capacitors connected in series, and the voltage-dividing capacitor is connected in parallel with the fan inverter module 150 through the DC bus of the air-conditioning fan drive circuit to divide the voltage of the DC bus through the voltage-dividing capacitor, so that the voltage resistance level of the fan inverter module 150 can be reduced, thereby greatly reducing the production cost of the system, and solving the high cost problem caused by the high voltage resistance level of the fan inverter module 150 in the existing related technology.

[0058] In addition, the fan inverter module 150 in the embodiment of the present application is used to drive the air-conditioning fan according to the rectifier signal, thereby realizing the startup and operation control of the air-conditioning fan and ensuring the normal operation of the air-conditioning fan.

[0059] In some optional embodiments of the present application, the three-phase power supply 110 signal provided by the three-phase power supply 110 may include a three-phase alternating current signal provided by the three-phase power supply 110, and may be specifically used to represent the three-phase alternating current. The Vienna rectifier 120, as a high-efficiency, high-power transformer circuit, may specifically include a three-phase rectifier circuit, and each phase rectifier circuit may be used as a group of single-phase rectifier circuits, so that the Vienna rectifier 120 may realize rectification control of the three-phase power supply 110 signal through three groups of single-phase rectifier circuits.

[0060] Optionally, the at least two voltage-dividing capacitors connected in series in the Vienna rectifier 120 may include a first capacitor C1 and a second capacitor C2. Figure 2As shown, the first end of each group of single-phase rectifier circuits in the Vienna rectifier 120 is electrically connected to the target single-phase power supply in the three-phase power supply 110 through an inductor filter, the second end of each group of single-phase rectifier circuits is electrically connected to the first end of the first capacitor C1, the third end of each group of single-phase rectifier circuits is electrically connected to the second end of the second capacitor C2, the third end of each group of single-phase rectifier circuits is electrically connected to the voltage dividing node, and the control end of each group of single-phase rectifier circuits is electrically connected to the control output end of the control module 140, the control output end of the control module 140 is used to output the rectifier tube closing signal or the three-phase modulated wave signal, and the voltage dividing node is the node where the first capacitor C1, the second capacitor C2 and the single-phase rectifier circuit are connected. Wherein, the target single-phase power supply is the single-phase power supply connected to the single-phase rectifier circuit.

[0061] In some optional embodiments of the present application, each group of single-phase rectifier circuits includes the inductor filter 210, the first diode D1, the second diode D2 and the single-phase rectifier transistor; wherein the input end of the inductor filter 210 is electrically connected to the target single-phase power supply, and the output end of the inductor filter 210 is electrically connected to the anode of the first diode D1, the cathode of the second diode D2 and the first end of the single-phase rectifier transistor, the cathode of the first diode D1 is electrically connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is electrically connected to the first end of the second capacitor C2, the second end of the single-phase rectifier transistor and the voltage dividing node, and the control end of the single-phase rectifier transistor is electrically connected to the control output end of the control module 140, so that the control module 140 can control the conduction and shutdown of the single-phase rectifier transistor by outputting a control signal through the control output end, thereby realizing output control. The control output end of the control module 140 is used to output a control signal to the Vienna rectifier 120, so as to control the conduction and shutdown of the single-phase rectifier transistor through the control signal.

[0062] In an embodiment of the present application, the transistor in the single-phase rectifier transistor can be implemented by an insulated gate bipolar transistor (IGBT) with a relatively low withstand voltage level to reduce system cost. Among them, the control signal output by the control module 140 can be used as a switch tube drive signal, so that the conduction and closing of the single-phase rectifier transistor can be controlled by the switch drive signal to realize the rectification control of the Vienna rectifier 120.

[0063] Optionally, the single-phase rectifier transistor in the embodiment of the present application includes a first insulated gate bipolar transistor G1 and a second insulated gate bipolar transistor G2 with opposite control polarities, so that the control module 140 can control the on and off of the transistors in the same single-phase rectifier circuit through a switch drive signal. Wherein, the first end of the first insulated gate bipolar transistor G1 is electrically connected to the output end of the inductor filter 210, the anode of the first diode D1, and the cathode of the second diode D2, the second end of the first insulated gate bipolar transistor G1 is electrically connected to the second end of the second insulated gate bipolar transistor G2, and the first end of the second insulated gate bipolar transistor G2 is electrically connected to the second end of the first capacitor, the first end of the second capacitor, and the voltage dividing node.

[0064] In some optional embodiments of the present application, the inductor filter 210 includes a filter inductor L and a resistor R, so that the inductor filter 210 can transmit the power signal provided by the target single-phase power supply connected to it to the single-phase rectifier circuit connected to the target single-phase power supply through the filter inductor L and the resistor R. Figure 2 As shown, the first end of the filter inductor L is electrically connected to the target single-phase power supply, and the second end of the filter inductor L is electrically connected to the anode of the first diode D1, the cathode of the second diode D2 and the first end of the single-phase rectifier transistor through the resistor R.

[0065] Of course, the filter inductor L and the resistor R in the inductor filter 210 can also be connected in series with the single-phase rectifier circuit in other connection modes. For example, the first end of the filter inductor L is connected to the target single-phase power supply through the resistor R, and the second end of the filter inductor L is directly connected to the anode of the first diode D1, the cathode of the second diode D2 and the first end of the single-phase rectifier transistor, so that the inductor filter 210 can transmit the power signal provided by the target single-phase power supply to the single-phase rectifier circuit connected to the target single-phase power supply through the filter inductor L.

[0066] As an example of the present application, all the rectifying transistors in the Vienna rectifier can be turned off first, so that the Vienna rectifier 120 can be rectified in a passive LC manner; by turning on the compressor and the air-conditioning fan of the air conditioner, the input current can reach a certain value, and after the input current reaches a certain value, the rectifying transistor in the Vienna rectifier 120 is turned on, that is, the IGBT tube in the Vienna rectifier 120 is turned on to perform power factor correction (Power Factor Correction, PFC), so that the power factor of the Vienna rectifier 120 is 1, achieving the optimal power factor state.

[0067] Specifically, the specific implementation of the air-conditioning fan drive circuit is as follows: the detection module 130 performs voltage and current sampling to measure the three-phase sampling signal and the output voltage signal corresponding to the Vienna rectifier 120, so that the control module 140 can determine the actual value of the line according to the three-phase sampling signal, and then determine the line state according to the actual value of the line. For example, when the actual current value of the line is used as the actual value for determining the line state, after determining the actual current value of the line according to the three-phase sampling signal, the current line state can be determined by judging whether the effective current value of the line is greater than the preset current value. For example, when the effective current value of the line is less than the preset current value, the actual current value of the line can be determined. In this case, the current line state is determined as the first line state, and a rectifier tube shutdown signal is output to shut down all rectifier transistors in the Vienna rectifier 120 through the rectifier tube shutdown signal; and when the effective value of the current of the line is greater than the preset current value, that is, after the effective value of the current of the line reaches the preset current value, the current line state can be switched to the second line state, and can be modulated according to the current input signal, such as performing signal modulation according to the three-phase sampling signal and the output voltage signal detected by the detection module 130 to obtain a three-phase modulated wave signal, and then the three-phase modulated wave signal can be output to the rectifier transistor to open and close the circuit accordingly, thereby realizing the output control of the rectifier transistor.

[0068] Among them, the bus current corresponding to the first line state is less than the bus current corresponding to the second line state; the preset current value refers to the current threshold value pre-set for the line state switching requirement, which can be used as the switching current for judging the line state, and is used to determine the line state, such as when the bus current is less than the preset switching current, the first line state is determined as the current line state of the air-conditioning fan drive circuit; and when the bus current is greater than the preset switching current, the second line state is determined as the current line state of the air-conditioning fan drive circuit, so that the bus current corresponding to the first line state is less than the bus current corresponding to the second line state. When the bus current is equal to the preset switching current, the second line state or the first line state is determined as the current line state of the air-conditioning fan drive circuit, and the embodiment of the present application does not limit this.

[0069] In some optional embodiments of the present application, the three-phase sampling signal detected by the detection module 130 may include a three-phase current signal, so that the control module 140 can determine the line state according to the detected three-phase current signal, such as the actual current value of the line can be determined as the effective current value of the line according to the detected three-phase current signal, and the current line state can be determined by judging whether the effective current value of the line is greater than the preset current value. For example, when the effective current value of the line is less than the preset current value, the current line state is determined as the first line state, and then a rectifier tube shutdown signal is output to shut down all rectifier transistors in the Vienna rectifier 120 through the rectifier tube shutdown signal; and when the effective current value of the line is greater than the preset current value, the current line state is determined to be the second line state, and can be modulated according to the current input signal to obtain a three-phase modulated wave signal, and then the three-phase modulated wave signal can be output to the rectifier transistor to open and close the circuit accordingly.

[0070] Among them, the three-phase current signal refers to the three-phase current sampling signal; the output voltage signal detected by the detection module 130 can include the voltage signal of each voltage-dividing capacitor, so that the control module 140 can determine the voltage on the voltage-dividing capacitor according to the voltage signal to achieve bus voltage protection and voltage equalization control.

[0071] For example, in the case where the detection module 130 includes a voltage sampling circuit and a current sampling circuit, voltage sampling can be performed through the voltage sampling circuit to detect the voltage on the voltage-dividing capacitor and generate a voltage signal of the voltage-dividing capacitor as an output voltage signal; and current sampling can be performed through the current sampling circuit, and the sampled three-phase current signal can be transmitted to the control module 140 as a three-phase sampling signal, so that the control module 140 can determine the line state according to the three-phase current signal. Among them, the current sampling circuit is specifically used to sample and detect the input current of the Vienna rectifier 120 to generate the three-phase current signal; the voltage sampling circuit is specifically used to perform voltage detection on the voltage-dividing capacitor to generate the voltage signal of the voltage-dividing capacitor.

[0072] Of course, in addition to the three-phase current signal, the three-phase sampling signal detected by the detection module 130 in the embodiment of the present application may also include other types of three-phase sampling signals, such as the three-phase voltage signal obtained by the detection module 130 through the voltage sampling circuit by sampling and detecting the input voltage of the Vienna rectifier 120. Therefore, in some optional embodiments of the present application, the three-phase sampling signal detected by the detection module 130 includes a three-phase voltage signal, so that the control module 140 can determine the line state according to the three-phase voltage signal detected by the detection module 130. For example, in the case where the detection module 130 includes a voltage sampling circuit, the input voltage of the Vienna rectifier 120 can be sampled and detected by the voltage sampling circuit to generate a three-phase voltage signal, and the three-phase voltage signal can be transmitted to the control module 140 as a three-phase sampling signal, so that the control module 140 can determine the line state according to the three-phase voltage signal. Among them, the three-phase voltage signal refers to the three-phase voltage sampling signal

[0073] As an example of the present application, when the detection module 130 includes a voltage sampling circuit and a current sampling circuit, the detection module 130 can perform voltage and current sampling through the voltage sampling circuit and the current sampling circuit, so as to transmit the sampled three-phase current signal and the three-phase voltage signal as the three-phase sampling signal to the control module 140, so that the control module 140 can determine the effective value of the current of the line according to the three-phase current signal and / or the three-phase voltage signal, so as to determine the current state of the line by judging whether the effective value of the current is greater than the preset current value. For example, when the preset current value is 2A, By judging whether the effective value of the current of the circuit is greater than 2A, when the effective value of the current of the circuit is less than 2A, the current circuit state can be determined to be the first circuit state, and a rectifier tube shutdown signal can be output to shut down all rectifier transistors in the Vienna rectifier 120, so that when the effective value of the current of the circuit is greater than 2A, the circuit state can be switched to the second circuit state, and the three-phase modulation wave signal can be obtained according to the current input signal. The three-phase modulation wave signal can then be output to the rectifier transistor to turn on the rectifier transistor through the switch tube drive signal contained in the three-phase modulation wave signal to achieve control of the rectifier transistor. The current sampling circuit is specifically used to sample and detect the input current of the Vienna rectifier 120 to generate the three-phase current signal; the voltage sampling circuit is specifically used to perform voltage detection on the voltage-dividing capacitor to generate the voltage signal of the voltage-dividing capacitor.

[0074] Of course, in addition to performing voltage detection on the voltage-dividing capacitor, the voltage sampling circuit in the embodiment of the present application can also be used to sample and detect the input voltage of the Vienna rectifier 120 to measure the three-phase voltage on the input side of the Vienna rectifier 120 and generate the three-phase voltage signal, so that the control module 140 can determine the line status according to the three-phase voltage signal.

[0075] Therefore, in an optional embodiment of the present application, the voltage sampling circuit is also specifically used to sample and detect the input voltage of the Vienna rectifier 120 to generate a three-phase voltage signal, so that the detection module 130 can transmit the three-phase voltage signal as a three-phase sampling signal to the control module 140, and then the control module 140 can determine the line status according to the three-phase voltage signal. For example, after receiving the three-phase voltage signal, the control module 140 can determine the voltage sampling value according to the three-phase voltage signal, and can replace the voltage sampling value with the actual current effective value of the line, so as to determine the current line state by judging whether the current effective value is greater than the preset current value. For example, when the current effective value is less than the preset current value of 2A, the current line state is determined as the first line state, and then a rectifier tube shutdown signal is output to shut down all rectifier transistors in the Vienna rectifier 120; after the current effective value is greater than the preset current value of 2A, the current line state is switched to the second line state, and modulated according to the current input signal to obtain a three-phase modulated wave signal, which can then be output to the rectifier transistor to turn on the rectifier transistor in the Vienna rectifier 120 through the three-phase modulated wave signal.

[0076] It can be seen that the detection module 130 in the embodiment of the present application can measure the three-phase current on the input side of the Vienna rectifier 120 through the current sampling circuit to generate a corresponding three-phase current signal. For example, the current sampling circuit can use a current transformer to obtain a current sampling value, and then the current sampling value can be converted into an actual value of the line through the control module 140. The actual value of the line can represent the operating state of the line, so that the actual value of the current sampling can be used as a basis for switching the on and off states of the rectifier transistor.

[0077] In addition, the detection module 130 in the embodiment of the present application can measure the three-phase voltage on the input side of the Vienna rectifier 120 and the voltage on the output side capacitor through the voltage sampling circuit, that is, the three-phase voltage on the input side of the Vienna rectifier 120 and the voltage of the output side voltage-dividing capacitor are detected through the voltage sampling circuit to generate a three-phase voltage signal based on the detected three-phase voltage, and transmit it to the control module 140 as a three-phase sampling signal, so that the control module 140 can determine the input voltage effective value according to the three-phase voltage signal, and then implement input high voltage and low voltage protection according to the input voltage effective value, such as when the input voltage effective value is greater than 265 V, and trigger low voltage protection when the effective value of the input voltage is less than 165V, and can generate a voltage signal of the voltage-dividing capacitor based on the detected voltage of the voltage-dividing capacitor, as an output voltage signal, which is transmitted to the control module 140, so that the control module 140 can determine the output side voltage value according to the output voltage signal, and the output side voltage value can include the voltage value on the voltage-dividing capacitor, so as to realize bus voltage protection and voltage equalization control based on the voltage value on the voltage-dividing capacitor, such as triggering high voltage protection when the total bus voltage is higher than 850V, and triggering low voltage protection when the total bus voltage is lower than 450V. The embodiments of the present application do not make specific restrictions on this.

[0078] Optionally, the fan inverter module 150 in the embodiment of the present application may include at least two inverters 220 connected in series and the air-conditioning fans M connected to the inverters 220 one by one, and the control end of each inverter 220 is electrically connected to the drive control end of the control module 140, so that the inverter 220 can output a drive signal to the air-conditioning fan M connected thereto, thereby realizing the drive of the air-conditioning fan M in the air-conditioning multi-fan system. Among them, the control module 140 is also used to output an inverter control signal according to a master control instruction; the inverter 220 is specifically used to output a drive signal to the air-conditioning fan M corresponding to the inverter 220 based on the rectifier signal according to the inverter control signal.

[0079] In some optional embodiments of the present application, the DC bus in the air-conditioning fan M driving circuit is divided into a first DC bus and a second DC bus. The at least two voltage-dividing capacitors included in the output capacitor of the Vienna rectifier 120 may specifically include a first capacitor C1 and a second capacitor C2, and the first capacitor C1 may be directly connected to the first DC bus, and the second capacitor C2 may be directly connected to the second DC bus. For example, when wiring an even number of fans in an air-conditioning multi-fan system, the first end of the first capacitor C1 may be connected to the first DC bus, the second end of the first capacitor C1 may be connected to the first end of the second capacitor C2, and the second end of the second voltage-dividing voltage may be connected to the second DC bus, so as to divide the DC bus in the air-conditioning fan M driving circuit into a first DC bus and a second DC bus, and the first DC bus and the second DC bus serve as the upper and lower buses of DC power, which may be connected to half of the fans respectively, and the voltage may be divided by the first capacitor C1 and the second capacitor C2, so that the fan inverter module 150 may select an IGBT with a low withstand voltage level as the inverter 220 for driving the air-conditioning fan M, thereby greatly reducing the production cost of the system.

[0080] In some optional embodiments of the present application, at least two inverters 220 connected in series in the fan inverter module 150 include a first inverter and a second inverter, the first end of the first inverter is electrically connected to the first end of the first capacitor C1 through the first DC bus, the second end of the first inverter is electrically connected to the first end of the second inverter, the second end of the second inverter is electrically connected to the second end of the second capacitor C2 through the second DC bus, and the second end of the first capacitor C1 is electrically connected to the first end of the second capacitor C2, so that voltage can be divided by the first capacitor C1 and the second capacitor C2, so that the withstand voltage level of the inverter 220 is reduced by using the voltage-dividing capacitor at the hardware level, and each air-conditioning fan M in the air-conditioning multi-fan system can be evenly distributed to the first capacitor C1 and the second capacitor C2 through the inverter 220, thereby greatly reducing the production cost of the system.

[0081] As an example of the present application, taking the case where the rectifying transistors in the Vienna rectifier 120 are all IGBT tubes, when the current of 2A is preset as the switching current, the IGBT tube in the Vienna rectifier 120 can be turned off first, so that the Vienna rectifier 120 can be rectified in a passive LC manner, and the compressor and the air conditioner fan M of the air conditioner can be turned on, so that after the input current reaches the switching current of 2A, the IGBT tube in the Vienna rectifier 120 is turned on, that is, the power factor correction PFC is turned on. The specific implementation is as follows:

[0082] First, voltage and current sampling is performed through the detection module 130 to measure the three-phase voltage and three-phase current on the input side of the Vienna rectifier 120 and the voltage on the output side capacitor; specifically, the voltage sampling circuit in the detection module 130 can use a resistor divider circuit to obtain a voltage sampling value in a differential sampling manner, and then convert it into an actual value of the line; the current sampling circuit in the detection module 130 can use a current transformer to obtain a current sampling value, and then convert the current sampling value into an actual value of the line. The actual value of the line can represent the operating state of the line, and the actual value of the current sampling can be used to switch the rectifier tube on and off. When the effective value of the current is less than 2A, the IGBT tube in the Vienna rectifier 120 is turned off, and when the effective value of the current is greater than 2A, the IGBT tube in the Vienna rectifier 120 is turned on. In addition, the actual value of the input side voltage sampling can be used for input high voltage and low voltage protection. By detecting the effective value of the input voltage, the high voltage protection can be triggered when the effective value of the input voltage is greater than 265V, and the low voltage protection can be triggered when the effective value of the input voltage is less than 165V; and the actual value of the output side voltage sampling can be used for bus voltage protection and voltage equalization control. When the total bus voltage is higher than 850V, the high voltage protection can be triggered, and when the total bus voltage is lower than 450V, the low voltage protection can be triggered.

[0083] Second, based on the detection sampling signal obtained by voltage and current sampling, the control module 140 is used for control and modulation. For example, it can be modulated according to the current input signal to obtain a three-phase modulation wave of the switch tube. Specifically, the current input signal can include a three-phase voltage signal and a three-phase current signal on the power input side, so that the three groups of single-phase rectifier circuits in the Vienna rectifier 120 can be controlled based on the three-phase voltage signal and the three-phase current signal. For example, the phase of the power grid can be obtained through a phase-locked loop according to the three-phase voltage signal and the three-phase current signal, so that the three-phase input side current can be stabilized according to the phase through the current control loop, and the DC output side inductor voltage can be stabilized through the voltage control loop. Then, comparative calculations are performed to modulate according to the space vector to determine the size sector interval of the vector voltage, so that a three-phase modulation wave signal can be generated according to the obtained sector interval of the vector voltage.

[0084] Third, output control is performed according to the three-phase modulation wave signal. Specifically, the three-phase modulation wave signal can be output to the IGBT tube in the Vienna rectifier 120. The IGBT tube serves as a switch tube, and the on-off time of the IGBT tube can be controlled by the three-phase modulation wave signal to open and close the circuit accordingly, thereby controlling the output of the Vienna rectifier 120 and the output of the inverter 220, and the opening and closing of the inverter 220 can be switched according to the main control instruction sent by the control module 140. The embodiment of the present application does not impose specific restrictions on this.

[0085] Figure 3The following is a schematic diagram of the steps of an air conditioner fan driving circuit method provided in an embodiment of the present application. The air conditioner fan driving circuit method provided in an embodiment of the present application can be applied to the air conditioner fan driving circuit described in any of the above embodiments of the present application, such as Figure 3 As shown, the air conditioner fan driving circuit method may specifically include the following steps:

[0086] Step 310, detecting the Vienna rectifier in the air conditioner fan drive circuit, generating a detection sampling signal corresponding to the Vienna rectifier, the detection sampling signal including a three-phase sampling signal and an output voltage signal;

[0087] Step 320, determining the line state according to the three-phase sampling signal;

[0088] Step 330, if the line state is the first line state, outputting a rectifier tube closing signal, wherein the rectifier tube closing signal is used to close all rectifier transistors in the Vienna rectifier;

[0089] Step 340: If the line state is the second line state, modulation is performed according to the three-phase sampling signal and the output voltage signal to generate a three-phase modulated wave signal, and the three-phase modulated wave signal is output to the Vienna rectifier.

[0090] The Vienna rectifier is used to rectify current based on a three-phase power supply signal provided by a three-phase power supply, and output a rectified signal, and the rectified signal is used to drive the air-conditioning fan.

[0091] It can be seen that the air-conditioning fan driving method provided by the present application detects the Vienna rectifier in the air-conditioning fan driving circuit to generate a detection sampling signal corresponding to the Vienna rectifier, and the detection sampling signal includes a three-phase sampling signal and an output voltage signal, and then determines the line state according to the three-phase sampling signal, so that when the line state is the first line state, a rectifier tube closing signal is output, so that all rectifier transistors in the Vienna rectifier can be closed by the rectifier tube closing signal, so that the Vienna rectifier rectifies the three-phase alternating current provided by the three-phase power supply in a passive LC manner and outputs a rectifier signal; and when the line state is the second line state, modulation is performed according to the three-phase sampling signal and the output voltage signal to generate a three-phase modulation wave signal, and the three-phase modulation wave signal is output to the Vienna rectifier, so that the Vienna rectifier can control the on-time and off-time of the rectifier transistor according to the three-phase modulation wave signal to achieve power factor correction, thereby making the power factor of the Vienna rectifier 1, achieving the best power factor state.

[0092] In some optional embodiments of the present application, determining the line state based on the three-phase sampling signal may specifically include: performing calculations based on the three-phase sampling signal to obtain the bus current of the air-conditioning fan drive circuit; if the bus current is less than a preset switching current, determining the first line state as the line state; if the bus current is greater than a preset switching current, determining the second line state as the line state.

[0093] It should be noted that, for the purpose of simple description, the method embodiments are expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited to the described order of actions, because according to the embodiments of the present application, certain steps may be performed in other orders or simultaneously.

[0094] like Figure 4 As shown, an embodiment of the present application provides an air-conditioning system 400, comprising an air-conditioning fan drive circuit 410, and the air-conditioning fan drive circuit 410 can be the air-conditioning fan drive circuit described in any embodiment of the present application, so that the air-conditioning system 400 can realize the conversion of three-phase alternating current into direct current through the Vienna rectifier in the air-conditioning fan drive circuit 410, and reduce the withstand voltage level of the fan inverter module by using a voltage-dividing capacitor, thereby greatly reducing the production cost of the system, and solving the high cost problem caused by the high withstand voltage level of the fan inverter module in the existing related technology.

[0095] In a specific implementation, the air-conditioning system provided in the embodiment of the present application can be used as a control system for air-conditioning equipment. The detection module detects the Vienna rectifier coupled to the three-phase power supply and generates a detection sampling signal, so that the control module can determine the line state according to the three-phase sampling signal included in the detection sampling signal, and output a rectifier tube closing signal when the line state is a first line state, and close all rectifier transistors in the Vienna rectifier. When the line state is a second line state, the output voltage signal included in the three-phase sampling signal and the detection sampling signal is modulated, and the three-phase modulated wave signal generated after the modulation is transmitted to the Vienna rectifier, so that the Vienna The rectifier can control the on and off of the rectifier transistor according to the three-phase modulation wave signal to achieve power factor correction, and perform current rectification based on the three-phase power supply signal provided by the three-phase power supply in combination with the control signal output by the control module, output the rectified signal, and transmit it to the fan inverter module, so that the fan inverter module can drive the air-conditioning fan according to the rectified signal to control the start-up of the air-conditioning fan and realize the operation control of the air-conditioning fan, and divide the voltage of the DC bus through the voltage-dividing capacitor, so that the withstand voltage level of the fan inverter module can be reduced, thereby greatly reducing the production cost of the system and solving the high cost problem caused by the high withstand voltage level of the fan inverter module in the existing related technology.

[0096] like Figure 5 As shown, an embodiment of the present application further provides an air-conditioning device, comprising: a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114, and the memory 113 is used to store computer programs; the processor 111 is used to implement the steps of the air-conditioning fan driving method provided by any of the aforementioned method embodiments when executing the computer program stored in the memory 113.

[0097] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the air conditioner fan driving circuit method provided by any of the aforementioned method embodiments is implemented.

[0098] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0099] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0100] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0101] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An air conditioner fan drive circuit, It is characterized in that include: Vienna rectifier, detection module, fan inverter module and control module coupled to the three-phase power supply; Wherein, the output capacitor of the Vienna rectifier includes at least two voltage-dividing capacitors connected in series, and the voltage-dividing capacitor is connected in parallel with the fan inverter module through the DC bus of the air-conditioning fan drive circuit; The detection module is used to detect the Vienna rectifier and generate a detection sampling signal corresponding to the Vienna rectifier, wherein the detection sampling signal includes a three-phase sampling signal and an output voltage signal; The control module is used to determine the line state according to the three-phase sampling signal; if the line state is the first line state, a rectifier tube closing signal is output, and the rectifier tube closing signal is used to close all rectifier transistors in the Vienna rectifier; if the line state is the second line state, modulation is performed according to the three-phase sampling signal and the output voltage signal, and a three-phase modulated wave signal is output; The Vienna rectifier is used to perform current rectification based on the three-phase power supply signal provided by the three-phase power supply in combination with the control signal output by the control module, and output a rectified signal, wherein the control signal includes the three-phase modulation wave signal and the rectifier tube closing signal; The fan inverter module is used to drive the air-conditioning fan according to the rectified signal; The fan inverter module includes at least two inverters connected in series and the air-conditioning fans connected one by one to the inverters; The control end of each inverter is electrically connected to the drive control end of the control module; The control module is also used to output an inverter control signal according to the main control instruction; The inverter is specifically configured to output a driving signal to the air-conditioning fan connected to the inverter according to the inverter control signal and based on the rectifier signal.

2. The air conditioner fan driving circuit according to claim 1, It is characterized in that The at least two voltage-dividing capacitors include a first capacitor and a second capacitor, and the Vienna rectifier includes three groups of single-phase rectifier circuits; The first end of each group of single-phase rectifier circuits is electrically connected to the target single-phase power supply in the three-phase power supply through an inductor filter, the second end of each group of single-phase rectifier circuits is electrically connected to the first end of the first capacitor, the third end of each group of single-phase rectifier circuits is electrically connected to the second end of the second capacitor, the third end of each group of single-phase rectifier circuits is electrically connected to a voltage dividing node, and the control end of each group of single-phase rectifier circuits is electrically connected to the control output end of the control module, the control output end of the control module is used to output the rectifier tube shutdown signal or the three-phase modulation wave signal, and the voltage dividing node is a node where the first capacitor, the second capacitor and the single-phase rectifier circuit are connected.

3. The air conditioner fan driving circuit according to claim 2, It is characterized in that Each group of single-phase rectification circuits comprises the inductor filter, a first diode, a second diode and a single-phase rectification transistor; The input end of the inductor filter is electrically connected to the target single-phase power supply, and the output end of the inductor filter is electrically connected to the anode of the first diode, the cathode of the second diode and the first end of the single-phase rectifier transistor, the cathode of the first diode is electrically connected to the first end of the first capacitor, the second end of the first capacitor is electrically connected to the first end of the second capacitor, the second end of the single-phase rectifier transistor and the voltage dividing node, and the control end of the single-phase rectifier transistor is electrically connected to the control output end of the control module.

4. The air conditioner fan driving circuit according to claim 3, It is characterized in that The single-phase rectifier transistor includes a first insulated gate bipolar transistor and a second insulated gate bipolar transistor having opposite control polarities; A first end of the first insulated gate bipolar transistor is electrically connected to the output end of the inductor filter, the anode of the first diode, and the cathode of the second diode, a second end of the first insulated gate bipolar transistor is electrically connected to the second end of the second insulated gate bipolar transistor, and a first end of the second insulated gate bipolar transistor is electrically connected to the second end of the first capacitor, the first end of the second capacitor, and the voltage dividing node.

5. The air conditioner fan driving circuit according to claim 3, It is characterized in that The inductor filter includes a filter inductor and a resistor, a first end of the filter inductor is electrically connected to the target single-phase power supply, and a second end of the filter inductor is electrically connected to the anode of the first diode, the cathode of the second diode and the first end of the single-phase rectifier transistor through the resistor.

6. The air conditioner fan driving circuit according to claim 1, It is characterized in that The at least two voltage-dividing capacitors include a first capacitor and a second capacitor, the DC bus is divided into a first DC bus and a second DC bus, and the at least two inverters include a first inverter and a second inverter; The first end of the first inverter is electrically connected to the first end of the first capacitor through the first DC bus, the second end of the first inverter is electrically connected to the first end of the second inverter, the second end of the second inverter is electrically connected to the second end of the second capacitor through the second DC bus, and the second end of the first capacitor is electrically connected to the first end of the second capacitor.

7. The air conditioner fan driving circuit according to any one of claims 1 to 6, It is characterized in that The three-phase sampling signal includes a three-phase current signal, the output voltage signal includes a voltage signal of each voltage-dividing capacitor, and the detection module includes a voltage sampling circuit and a current sampling circuit; The current sampling circuit is specifically used to sample and detect the input current of the Vienna rectifier to generate the three-phase current signal; The voltage sampling circuit is specifically used to perform voltage detection on the voltage-dividing capacitor to generate a voltage signal of the voltage-dividing capacitor.

8. The air conditioner fan driving circuit according to claim 7, It is characterized in that The three-phase sampling signal also includes a three-phase voltage signal, and the voltage sampling circuit is specifically used to sample and detect the input voltage of the Vienna rectifier to generate the three-phase voltage signal.

9. An air conditioning system, It is characterized in that It comprises the air conditioner fan driving circuit as described in any one of claims 1 to 8.

10. A method for driving an air conditioner fan, It is characterized in that Applied to the air conditioner fan driving circuit according to any one of claims 1 to 8, the method comprises: Detecting the Vienna rectifier in the air conditioner fan drive circuit to generate a detection sampling signal corresponding to the Vienna rectifier, wherein the detection sampling signal includes a three-phase sampling signal and an output voltage signal; Determining a line state according to the three-phase sampling signal; If the line state is the first line state, a rectifier tube closing signal is output, and the rectifier tube closing signal is used to close all rectifier transistors in the Vienna rectifier; If the line state is the second line state, modulating according to the three-phase sampling signal and the output voltage signal to generate a three-phase modulated wave signal, and outputting the three-phase modulated wave signal to the Vienna rectifier; Wherein, the Vienna rectifier is used to perform current rectification based on the three-phase power supply signal provided by the three-phase power supply, and output the rectified signal to the fan inverter module in the air-conditioning fan drive circuit; the fan inverter module is used to drive the air-conditioning fan according to the rectified signal; The fan inverter module includes at least two inverters connected in series and the air-conditioning fans connected one by one to the inverters; the control end of each inverter is electrically connected to the driving control end of the control module in the air-conditioning fan driving circuit; The inverter is specifically configured to output a driving signal to the air-conditioning fan connected to the inverter based on the rectifier signal according to the inverter control signal output by the control module.

11. The air conditioner fan driving method according to claim 10, It is characterized in that Determining the line state according to the three-phase sampling signal comprises: Calculating according to the three-phase sampling signal to obtain the bus current of the air conditioner fan drive circuit; If the bus current is less than the preset switching current, determining the first line state as the line state; If the bus current is greater than a preset switching current, the second line state is determined as the line state.

12. An air conditioning device, It is characterized in that include: A processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory, used to store computer programs; The processor is used to implement the steps of the air conditioning fan driving method as claimed in claim 10 or 11 when executing the program stored in the memory.

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