Driving circuit of three-phase Vienna rectifying circuit and three-phase frequency converter of air conditioner

Abstract

The utility model discloses a driving circuit of a three-phase Vienna rectifying circuit and an air conditioner three-phase frequency converter. The hardware cost, the control complexity and the layout wiring complexity are reduced. The driving circuit comprises three driving modules, namely a first driving module, a second driving module and a third driving module, the input ends of the three driving modules are connected to three paths of control signal output ends of the control circuit in a one-to-one manner; the output end of the first driving module is connected to the control ends of two switching tubes on the A phase of the main circuit of the three-phase Vienna rectifier circuit, and is used for outputting the same path of driving signals to the two switching tubes on the A phase; the output end of the second driving module is connected to the control ends of the two switching tubes on the B phase of the main circuit and is used for outputting the same path of driving signals to the two switching tubes on the B phase; and the output end of the third driving module is connected to the control ends of the two switching tubes on the C phase of the main circuit and is used for outputting the same path of driving signals to the two switching tubes on the C phase.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and particularly relates to a driving circuit of a three-phase Vienna rectifier circuit and an air conditioner three-phase frequency converter. BACKGROUND

[0002] The three-phase Vienna rectifier circuit is a rectifier topology structure widely used in the field of power electronics. It realizes the bidirectional flow of power by accurately controlling the on-off state of the internal bidirectional switch (i.e. six switch tubes), and makes the grid-side current track the grid voltage in real time, so that the system operates in a high power factor state.

[0003] The traditional driving circuit of the three-phase Vienna rectifier circuit is composed of six driving modules. The six driving modules are responsible for receiving six control signals from the control circuit, and independently controlling the on-off state of the six switch tubes according to the six control signals. However, this design scheme needs to deploy more driving modules, which not only increases the hardware cost, but also increases the control complexity and the complexity of layout and wiring. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a driving circuit of a three-phase Vienna rectifier circuit and an air conditioner three-phase frequency converter to reduce the hardware cost, control complexity and layout and wiring complexity. The specific scheme is as follows:

[0005] The first aspect of the present application provides a driving circuit of a three-phase Vienna rectifier circuit, comprising: three driving modules, which are a first driving module, a second driving module and a third driving module;

[0006] The input end of the three driving modules is connected to the three-way control signal output end of the control circuit of the three-phase Vienna rectifier circuit one by one;

[0007] The output end of the first driving module is connected to the control end of the two switch tubes on the A phase of the main circuit of the three-phase Vienna rectifier circuit, and is used for outputting the same driving signal to the two switch tubes on the A phase;

[0008] The output end of the second driving module is connected to the control end of the two switch tubes on the B phase of the main circuit of the three-phase Vienna rectifier circuit, and is used for outputting the same driving signal to the two switch tubes on the B phase;

[0009] The output end of the third driving module is connected to the control end of the two switch tubes on the C phase of the main circuit of the three-phase Vienna rectifier circuit, and is used for outputting the same driving signal to the two switch tubes on the C phase.

[0010] In a possible implementation, the internal circuit structures of the three driving modules are the same.

[0011] In a possible implementation, the first driving module comprises a driving chip, a first resistor and a bidirectional diode.

[0012] A first power supply pin of the driving chip is connected to the first power supply.

[0013] A positive input end of the driving chip is connected to a control signal output end of the control circuit.

[0014] A negative input end of the driving chip is used as an enable end of the driving chip.

[0015] A ground pin of the driving chip is connected to the ground.

[0016] A second power supply pin of the driving chip is connected to a second power supply.

[0017] An output pin of the driving chip is connected to a first end of the bidirectional diode and control ends of two switch tubes on the A phase through the first resistor.

[0018] A clamp pin of the driving chip is connected to the output pin.

[0019] A negative power supply voltage pin of the driving chip is connected to a negative power supply, a second end of the bidirectional diode and input ends of the two switch tubes on the A phase.

[0020] In a possible implementation, the second power supply is a +15V power supply, and the negative power supply is a -7V power supply.

[0021] In a possible implementation, the driving chip is an isolation driving chip.

[0022] In a possible implementation, the first driving module further comprises a first RC filter circuit connected between the control signal output end of the control circuit and the positive input end of the driving chip.

[0023] and / or,

[0024] The first driving module further comprises a second RC filter circuit connected between an enable signal output end of the control circuit and the negative input end of the driving chip.

[0025] In a possible implementation, the first driving module further comprises a first capacitor filter circuit connected between the first power supply pin of the driving chip and the ground.

[0026] In a possible implementation, the first driving module further comprises a second filter capacitor circuit connected between the second power supply pin of the driving chip and the second end of the bidirectional diode.

[0027] And / or, the first drive module further comprises: a third filter capacitor circuit connected between a negative power supply voltage pin of the drive chip and a second end of the bidirectional diode.

[0028] In a possible implementation, the first drive module further comprises: a voltage stabilizing circuit connected between an output pin of the drive chip and a first end of the bidirectional diode.

[0029] The voltage stabilizing circuit comprises: a capacitor connected in parallel with the bidirectional diode, and a resistor connected in parallel with the bidirectional diode.

[0030] The second aspect of the present application provides a three-phase Vienna rectifier driving circuit of an air conditioner, comprising the driving circuit of the three-phase Vienna rectifier as in the first aspect or any implementation manner of the first aspect.

[0031] According to the technical solution, the driving circuit of the three-phase Vienna rectifier uses one drive module to control the on-off state of two switching tubes simultaneously according to the characteristic that the two switching tubes of each phase of the three-phase Vienna rectifier are turned on and turned off at the same time, thereby saving half of the number of drive modules used, and reducing the hardware cost, control complexity and complexity of layout and wiring. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements and features are not necessarily drawn to scale.

[0033] Figure 1 A main circuit schematic diagram of a three-phase Vienna rectifier provided by the present application;

[0034] Figure 2 A driving circuit composition block diagram of a three-phase Vienna rectifier provided by the present application;

[0035] Figure 3 A driving circuit composition block diagram of a three-phase Vienna rectifier provided by the present application; Figure 2 A circuit schematic diagram of a drive module in the driving circuit shown;

[0036] Figure 4 A driving circuit composition block diagram of a three-phase Vienna rectifier provided by the present application; Figure 2 A circuit schematic diagram of a drive module in the driving circuit shown;

[0037] Figure 5 A driving circuit composition block diagram of a three-phase Vienna rectifier provided by the present application; Figure 2 A circuit schematic diagram of a drive module in the driving circuit shown;

[0038] Figure 6 Yet another aspect of the present application provides Figure 2 a circuit schematic of a drive module in the drive circuit shown;

[0039] Figure 7 Yet another aspect of the present application provides Figure 2 a circuit schematic of a drive module in the drive circuit shown;

[0040] Figure 8 Yet another aspect of the present application provides Figure 2 a circuit schematic of a drive module in the drive circuit shown. DETAILED DESCRIPTION

[0041] In the following elaboration, in order to ensure the accuracy of the cited and the fluency of the reading, the key technical terms, abbreviations or acronyms involved in the text are summarized and explained as follows:

[0042] IGBT: Insulated Gate Bipolar Transistor, insulated gate bipolar transistor;

[0043] MOSFET: Metal-Oxide-Semiconductor Field-Effect Transistor, metal oxide semiconductor field effect transistor;

[0044] MCU: Micro Controller Unit, micro control unit.

[0045] Three-phase Vienna rectifier circuit is a rectifier topology widely used in the field of power electronics. The main circuit schematic diagram is shown in Figure 1 , which includes a three-phase diode rectifier bridge and a bidirectional switch arranged in each phase; the three-phase diode rectifier bridge is composed of six diodes D1-D6, which are arranged in Y-type (i.e. star) connection mode, responsible for converting the input three-phase AC power L 123 into a pulsating DC voltage (three-phase AC power L 123 The latter can also be connected to an EMC filter to suppress electromagnetic interference); each bidirectional switch is composed of two switching tubes (switching tubes are usually IGBT or MOSFET) and its anti-parallel diode, forming a half-bridge structure that can be bidirectional.

[0046] Three-phase Vienna rectifier circuit realizes bidirectional power flow by precisely controlling the on-off state of internal bidirectional switches, and makes the grid-side current real-time track the grid voltage, so that the system operates in a high power factor state. This feature makes three-phase Vienna rectifier circuit an ideal choice for occasions that require high power factor correction and high-quality DC power supply, such as air conditioner three-phase frequency converters (for example Figure 1As shown, in the three-phase inverter of the air conditioner, the output end of the three-phase Vienna rectifier circuit is connected with the fan 1, the fan 2 and the inverter circuit, and the output end of the inverter circuit is connected with the compressor, the photovoltaic power generation system and the like.

[0047] The conventional drive circuit of the three-phase Vienna rectifier circuit is composed of six drive modules, which receive six control signals from the control circuit of the three-phase Vienna rectifier circuit, such as an MCU, and independently control the turn-on and turn-off of the six switching tubes in the three-phase Vienna rectifier circuit.

[0048] Specifically, the A-phase bidirectional switch is composed of a switching tube S A1 , a switching tube S A2 and their anti-parallel diodes; the output end of the switching tube S A1 is connected with the output end of the switching tube S A2 , the control end of the switching tube S A1 and the control end of the switching tube S A2 are independently connected with their respective drive modules, and the input end of the switching tube S A1 and the input end of the switching tube S A2 are independent of each other; when the switching tube is a MOSFET, the input end of the switching tube is the drain of the MOSFET, the output end of the switching tube is the source of the MOSFET, and the control end of the switching tube is the gate of the MOSFET; when the switching tube is an IGBT, the input end of the switching tube is the collector of the IGBT, the output end of the switching tube is the emitter of the IGBT, and the control end of the switching tube is the gate of the IGBT. The B-phase bidirectional switch is composed of a switching tube S B1 , a switching tube S B2 and their anti-parallel diodes, and the C-phase bidirectional switch is composed of a switching tube S C1 , a switching tube S C2 and their anti-parallel diodes; the connection relationship of the A-phase bidirectional switch can be analogized to the B-phase and the C-phase, because the three-phase Vienna rectifier circuit pursues three-phase symmetry in design.

[0049] However, the conventional drive circuit design scheme of the three-phase Vienna rectifier circuit has at least the following problems due to the need to deploy more drive modules:

[0050] 1) The hardware cost is increased, especially in large-scale production or high-end applications, and the cost problem is particularly prominent.

[0051] 2) The control complexity is significantly increased, which puts higher requirements on the performance of the MCU, because the MCU needs to simultaneously process and accurately output six control signals, increasing the programming difficulty and real-time requirements.

[0052] 3) Increased the complexity of the layout of the wire, thereby increasing the probability of failure due to improper wiring or signal interference. For example, if the control signal generated by the MCU fails to be transmitted to the drive module in time due to delay or interference, it may cause the switch tube to work in an unexpected state, or even be damaged.

[0053] To this end, the embodiment of the present application provides a driving circuit of a three-phase Vienna rectifier circuit. According to the characteristics of the two switch tubes of each phase of the three-phase Vienna rectifier circuit being turned on and turned off at the same time, the driving circuit uses one driving module to control the on-off state of the two switch tubes at the same time, thereby saving half of the number of driving modules used, and thereby reducing the hardware cost, the control complexity and the complexity of the layout of the wire.

[0054] The driving circuit of the three-phase Vienna rectifier circuit provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art can know that the technical solutions provided by the embodiment of the present application are also applicable to similar technical problems as the technology develops and new scenarios appear.

[0055] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, which is only a way of distinguishing the objects with the same attributes used in the description of the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the processes, methods, systems, products or equipment containing a series of units do not have to be limited to those units, but can include other units not clearly listed or inherent to these processes, methods, products or equipment.

[0056] Referring to Figure 2 The driving circuit of the three-phase Vienna rectifier circuit provided by the embodiment of the present application comprises three driving modules, which are a first driving module, a second driving module and a third driving module;

[0057] The input ends of the three driving modules are independently connected to the three-way control signal output ends of the control circuit of the three-phase Vienna rectifier circuit, respectively, for independently receiving the three-way control signals output by the control circuit;

[0058] The output end of the first driving module is connected to the control ends of the two switch tubes on the A phase of the main circuit of the three-phase Vienna rectifier circuit, for outputting the same driving signal to the two switch tubes on the A phase;

[0059] The output end of the second driving module is connected to the control ends of the two switch tubes on the B phase of the main circuit of the three-phase Vienna rectifier circuit, for outputting the same driving signal to the two switch tubes on the B phase;

[0060] The output end of the third driving module is connected to the control ends of the two switch tubes on the C phase of the main circuit of the three-phase Vienna rectifier circuit, for outputting the same driving signal to the two switch tubes on the C phase.

[0061] Figure 2 The working principle of the embodiment is as follows:

[0062] In the main circuit of the three-phase Vienna rectifier circuit, the two switch tubes of each phase are turned on and turned off at the same time, that is to say: the driving signal received by the control end of the switch tube S A1 is the same as the driving signal received by the control end of the switch tube S A2 , and the switch tube S A1 and the switch tube S A2 are turned on and turned off at the same time; the driving signal received by the control end of the switch tube S B1 is the same as the driving signal received by the control end of the switch tube S B2 , and the switch tube S B1 and the switch tube S B2 are turned on and turned off at the same time; the driving signal received by the control end of the switch tube S C1 is the same as the driving signal received by the control end of the switch tube S C2 , and the switch tube S C1 and the switch tube S C2 are turned on and turned off at the same time.

[0063] Based on this, the control end of the switch tube S A1 is connected to the control end of the switch tube S A2 , and the same driving module, i.e., the first driving module, is shared; at the same time, the control end of the switch tube S B1 is connected to the control end of the switch tube S B2 , and the same driving module, i.e., the second driving module, is shared; at the same time, the control end of the switch tube S C1 is connected to the control end of the switch tube S C2 , and the same driving module, i.e., the third driving module, is shared.

[0064] By allowing the two switch tubes of the same phase to share the same driving module, half of the driving modules can be saved, which has at least the following technical advantages:

[0065] 1) The cost is reduced, especially in large-scale production or high-end applications, and the cost saving effect is particularly significant, because each reduction in components will accumulate into considerable cost savings in mass production. This not only improves the price competitiveness of the product, but also leaves more profit space for the enterprise for research and development investment, quality improvement or market expansion, thereby further enhancing the market competitiveness of the product.

[0066] 2) Control complexity is significantly reduced, which reduces the high requirements on the performance of the MCU, because: the number of control signals that the MCU needs to process and output accurately at the same time is reduced, the MCU can focus more on the execution of core tasks without being distracted too much by complex signal management; at the same time, the programming difficulty and real-time requirements of the MCU are also reduced, making the development and maintenance of the system easier, which helps to shorten the product development cycle, improve development efficiency, and reduce the risk of system failure caused by programming errors or insufficient real-time performance.

[0067] 3) The complexity of the layout wiring is reduced, which helps to reduce the probability of failure caused by improper wiring or signal interference. Clear layout and simplified wiring not only improve the reliability of the system, but also reduce the difficulty of debugging and maintenance. In addition, the simplified layout wiring helps to improve the transmission efficiency and stability of the signal, ensuring that the control signals generated by the MCU can be accurately transmitted to the drive module, thereby controlling the switch tube to work in the expected state, to a large extent, avoiding the problem of unintended operation or damage caused by signal delay or interference.

[0068] In a possible implementation, the internal circuit structures of the three drive modules in the drive circuit of the three-phase Vienna rectifier circuit are the same, because the three-phase Vienna rectifier circuit pursues three-phase symmetry in design.

[0069] In a possible implementation, in the case where the internal circuit structures of the three drive modules are the same, referring to Figure 3 , the first drive module includes: a drive chip U1, a first resistor R1, and a bidirectional diode D1.

[0070] Wherein, the meanings of the pins of the drive chip U1 are as follows:

[0071] 1) Pin 1: first power supply pin (VCC1), used to provide independent power input for a part of functional modules inside the chip.

[0072] 2) Pin 2: positive input end (IN+), used to receive the positive signal input of the external circuit.

[0073] 3) Pin 3: negative input end (IN-), used to receive the negative signal input of the external circuit.

[0074] 4) Pin 4: ground pin (GND1), used to connect the circuit of the chip to the ground line to form a loop.

[0075] 5) Pin 5: second power supply pin (VCC2), similar to the first power supply pin (VCC1), used to provide independent power input for another part of functional modules inside the chip.

[0076] 6) Pin 6: Output pin (OUT), for outputting the processed signal inside the chip to the external circuit.

[0077] 7) Pin 7: Clamp pin (CLAMP), for limiting the amplitude or voltage of the output signal.

[0078] 8) Pin 8: Negative power voltage pin (VEE2), for providing negative voltage to the chip.

[0079] Still referring to Figure 3 Pin 1 of the driving chip U1 is connected to the first power supply (e.g. +3.3V power supply);

[0080] Pin 2 is connected to a control signal output terminal of the control circuit, for receiving the control signal output by the control circuit, which is used to control the output state of Pin 6 of the driving chip U1;

[0081] Pin 3 is connected to be used as the enable terminal of the driving chip U1;

[0082] Pin 4 is connected to ground;

[0083] Pin 5 is connected to the second power supply (e.g. +15V power supply);

[0084] Pin 6 is connected to the first end of the bidirectional diode D1 and the control terminals of the two switch tubes on phase A through the first resistor R1;

[0085] Pin 7 is connected to Pin 6;

[0086] Pin 8 is connected to the negative power supply (e.g. -7V power supply), the second end of the bidirectional diode D1, and the input terminals of the two switch tubes on phase A.

[0087] Figure 3 The working principle of the embodiment shown is as follows:

[0088] Figure 3 In the embodiment shown, Pin 8 is connected to the negative power supply instead of ground, because compared to the case where Pin 5 is connected to the second power supply and Pin 8 is connected to ground, the scheme where Pin 5 is connected to the second power supply and Pin 8 is connected to the negative power supply can provide a larger voltage difference between the control terminals and the input terminals of the switch tubes. Voltage difference is one of the important factors affecting driving capability. A larger voltage difference usually means that a larger current or higher power output can be generated, thereby driving a heavier load or achieving a faster response speed.

[0089] The first resistor R1 is a driving resistor, used for limiting current, voltage division, etc.

[0090] The bidirectional diode D1 is used to clamp the voltage difference in the circuit within a certain range, preventing the voltage from being too high or too low, which helps to ensure the stability and reliability of the circuit, especially in the case of large power supply voltage fluctuations.

[0091] In one possible implementation, based on the above Figure 3 In the illustrated embodiment, driver chip U1 is an isolation driver chip whose primary function is to isolate the left and right sides from noise, interference, etc. This isolation is crucial to ensuring system stability and reliability, especially when processing high-frequency, high-power, or sensitive signals.

[0092] In one possible implementation, based on the above Figure 3 In the illustrated embodiment or any expanded embodiment thereof, the control circuit outputs three control signals which are respectively sent to the three driving modules; the control circuit outputs one enable signal to the enable terminals of the three driving modules.

[0093] In one possible implementation, based on the above Figure 3 The embodiment shown or any of its extended embodiments, see Figure 4 The first driving module also includes: a first RC filter circuit 100 connected between the control signal output terminal of the control circuit and pin 2 of the driving chip U1; the first RC filter circuit 100 is composed of a resistor R2 and a capacitor C1, one end of the capacitor C1 is grounded GND, and the other end of the capacitor C1 is connected to pin 2 and connected to the control signal output terminal of the control circuit through the resistor R2.

[0094] The working principle of the RC filter circuit is to filter out the high-frequency components and retain the low-frequency components in the input signal through the charge and discharge characteristics of the capacitor. By adjusting the values ​​of the resistor and capacitor, the cutoff frequency and filtering effect of the RC filter circuit can be changed to meet different application requirements.

[0095] In one possible implementation, based on the above Figure 3 The embodiment shown or any of its expanded embodiments, still refer to Figure 4 The first driving module also includes: a second RC filter circuit 200 connected between the enable signal output terminal of the control circuit and pin 3 of the driving chip U1; the second RC filter circuit 200 is composed of a resistor R3 and a capacitor C2, one end of the capacitor C2 is grounded GND, and the other end of the capacitor C2 is connected to pin 3 and connected to the enable signal output terminal of the control circuit through the resistor R3.

[0096] In one possible implementation, based on the above Figure 3 The embodiment shown or any of its expanded embodiments, still refer to Figure 5 The first driving module further includes a first capacitor filter circuit 300 connected between pin 1 and ground GND. The first capacitor filter circuit 300 is formed by a filter capacitor C3 and a filter capacitor C4 connected in parallel, and the capacitances of the filter capacitors C3 and C4 are not equal.

[0097] The working principle of the first filter capacitor circuit is as follows: the capacitor filter is to realize the filtering of the signal by using the charging and discharging characteristics of the capacitor. When the power supply voltage is higher than the voltage required by the load, the capacitor will be charged; when the power supply voltage is lower than the voltage required by the load, the capacitor will be discharged. Through the charging and discharging process of the capacitor, the fluctuation of the power supply voltage is suppressed, thereby achieving the purpose of filtering. The two capacitors in parallel can cover a wider range of filter frequencies. The large capacitor can store more electric energy, which helps to offset the change of low-frequency signal, while the small capacitor has a lower self-resonant frequency and can provide lower impedance to filter out high-frequency signals. Therefore, this design can effectively filter out low-frequency and high-frequency noise at the same time.

[0098] In a possible implementation, based on the above Figure 3 embodiment or any of its extended embodiments, referring to Figure 6 , the first driving module further comprises a second filter capacitor circuit 400 connected between the pin 5 and the second end of the bidirectional diode D1. The second filter capacitor circuit 400 is formed by the filter capacitor C5 and the filter capacitor C6 in parallel, and the capacitance values of the filter capacitor C5 and the filter capacitor C6 are not equal.

[0099] In a possible implementation, based on the above Figure 3 embodiment or any of its extended embodiments, referring to Figure 7 , the first driving module further comprises a third filter capacitor circuit 500 connected between the pin 8 and the second end of the bidirectional diode D1. The third filter capacitor circuit 500 is formed by the filter capacitor C7 and the filter capacitor C8 in parallel, and the capacitance values of the filter capacitor C7 and the filter capacitor C8 are not equal.

[0100] In a possible implementation, based on the above Figure 3 embodiment or any of its extended embodiments, referring to Figure 8 , the first driving module further comprises a voltage stabilizing circuit 600 connected between the pin 6 and the first end of the bidirectional diode D1. The voltage stabilizing circuit 600 comprises: a capacitor C9 connected in parallel with the bidirectional diode D1, and a resistor R4 connected in parallel with the bidirectional diode D1.

[0101] The working principle of the voltage stabilizing circuit 600 is as follows:

[0102] The capacitor C9 plays a role in stabilizing the voltage in the circuit. Specifically, the capacitor can store electric charges and release the electric charges in the circuit to maintain the stability of the voltage. When the voltage in the circuit rises, the capacitor will absorb the excess electric charges; when the voltage decreases, the capacitor will release the stored electric charges, thereby maintaining the stability of the voltage to a certain extent.

[0103] The parallel resistor R4 functions to provide a continuous current for the capacitor C9. In the circuit, if the capacitor C9 is directly disconnected from the circuit after discharging, the inductance in the circuit may generate a counter electromotive force, which may cause damage to other elements in the circuit. To avoid this situation, a resistor R4 can be connected in parallel to provide a discharge path for the capacitor C9, i.e. a continuous current path. In this way, when the capacitor C9 discharges, the current can flow back to the power supply through the resistor R4, thereby avoiding the generation of a high counter electromotive force.

[0104] In addition, the embodiment of the present application further discloses a three-phase frequency converter of an air conditioner, comprising any one of the driving circuits provided above.

[0105] An air conditioning system is a complex system designed to regulate the temperature, humidity, air flow, and air quality of an indoor environment to provide a comfortable and healthy indoor environment. An air conditioner is an important component of an air conditioning system. An air conditioner is a device used to regulate the temperature and humidity of an indoor environment, which absorbs indoor hot air through a reciprocating cycle, and then discharges indoor heat through condensation, evaporation, compression, and other processes, and then sends cold air back to the indoor environment to achieve indoor air cooling or heating.

[0106] A three-phase frequency converter of an air conditioner is a power electronic device applied in an air conditioning system, mainly used to regulate and control the speed of an air conditioner compressor. By changing the frequency of the power supply, the three-phase frequency converter can achieve stepless speed regulation of the motor (i.e. the air conditioner compressor), thereby meeting the precise control requirements of the air conditioning system for refrigeration or heating capacity.

[0107] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present application. Therefore, the embodiments of the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A driving circuit of a three-phase Vienna rectifier circuit, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

2. The driving circuit of a three-phase Vienna rectifier circuit as defined in claim 1, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

3. The driving circuit of a three-phase Vienna rectifier circuit as defined in claim 2, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

4. The driving circuit of a three-phase Vienna rectifier circuit as defined in claim 3, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

5. The driving circuit of a three-phase Vienna rectifier circuit according to claim 3, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

6. The driving circuit of a three-phase Vienna rectifier circuit according to any one of claims 3 to 5, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

7. The driving circuit of a three-phase Vienna rectifier circuit according to any one of claims 3 to 5, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

8. The driving circuit of a three-phase Vienna rectifier circuit according to any one of claims 3 to 5, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

9. The driving circuit of a three-phase Vienna rectifier circuit according to any one of claims 3 to 5, characterized in that The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

10. An air conditioner three-phase frequency converter, characterized by, The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit. The application relates to a driving circuit of a three-phase Vienna rectifier circuit.

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