Totem pole power factor correction circuits, drives, compressors and air conditioning equipment

Abstract

The present invention discloses a totem pole power factor correction circuit, a driving device, a compressor and an air conditioning device. The totem pole power factor correction circuit includes a power conversion module, an inductor module, a capacitor module and a switch module. The power conversion module includes a plurality of unidirectional conductive units connected in a bridge shape, each unidirectional conductive unit is respectively connected in parallel with a switch unit; the capacitor module includes a first capacitor and a second capacitor connected in series, which are connected in parallel with the output end of the power conversion module; one end of the switch module is connected to an input end of the power conversion module, and the other end of the switch module is connected to the connection point of the first capacitor and the second capacitor. The power conversion module and the switch module of the present invention enable the totem pole power factor correction circuit to switch between different topological structures to meet different load requirements in coordination with different control timings, thereby reducing the power module loss in the circuit. The present invention is widely used in the field of electronic power technology.

Description

Technical Field

[0001] The invention relates to the technical field of electronic power, in particular to a totem pole power factor correction circuit, a driving device, a compressor and an air conditioning device. Background Art

[0002] In the existing electronic power technology, in order to obtain a higher power factor, a power factor correction (Power Factor Correction) circuit is often used to provide a bus voltage. Some existing power factor correction circuits have a boosting effect, that is, the output voltage of the power factor correction circuit is higher than the input voltage. However, when the required voltage and load conditions change greatly, the existing power factor correction circuit cannot provide different working circuits according to the changes in the required voltage and load conditions, so that when the required voltage and load conditions change greatly, the power module loss in the circuit increases. Summary of the invention

[0003] In response to at least one of the above technical problems, the purpose of the present invention is to provide a totem pole power factor correction circuit, a drive device, a compressor and an air-conditioning device, which can enable the totem pole power factor correction circuit to switch between different topological structures to cooperate with different control timings to meet different load requirements, thereby reducing the power module loss in the circuit.

[0004] According to a first aspect of an embodiment of the present invention, a totem pole power factor correction circuit is provided, comprising:

[0005] A power conversion module, comprising a plurality of unidirectional conductive units connected in a bridge shape, each of the unidirectional conductive units being connected in parallel with a switch unit; an input end of the power conversion module being used to connect to an AC power source, and an output end of the power conversion module being used to connect to a load;

[0006] An inductor module, arranged between the power conversion module and the AC power supply;

[0007] A capacitor module, comprising a first capacitor and a second capacitor connected in series; the capacitor module is connected in parallel with the output end of the power conversion module;

[0008] A switch module, one end of which is connected to an input end of the power conversion module, and the other end of which is connected to a connection point between the first capacitor and the second capacitor.

[0009] In this embodiment, a plurality of switch units and unidirectional conduction units are connected in a bridge shape within a power conversion module, and one end of the switch module is connected to an output end of the power conversion module, and the other end of the switch module is connected to a connection point between a first capacitor and a second capacitor, so that the totem pole power factor correction circuit can switch between different topological structures in accordance with different control timings, thereby reducing the loss of functional modules within the circuit.

[0010] The working circuit can be switched according to the voltage requirements of the load with different parameters, so as to reduce the power module loss in the circuit when realizing the boost and voltage doubling functions.

[0011] In addition, the totem pole power factor correction circuit according to the above embodiment of the present invention may also have the following additional technical features:

[0012] Optionally, in one embodiment of the present invention, the power conversion module includes a first unidirectional conduction unit, a second unidirectional conduction unit, a third unidirectional conduction unit, a fourth unidirectional conduction unit, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit;

[0013] The first unidirectional conductive unit is connected in parallel with the first switch unit, the second unidirectional conductive unit is connected in parallel with the second switch unit, the third unidirectional conductive unit is connected in parallel with the third switch unit, and the fourth unidirectional conductive unit is connected in parallel with the fourth switch unit;

[0014] The positive electrode of the first one-way conductive unit is connected to the negative electrode of the second one-way conductive unit, the positive electrode of the third one-way conductive unit is connected to the negative electrode of the fourth one-way conductive unit, the negative electrode of the first one-way conductive unit is connected to the negative electrode of the third one-way conductive unit, and the positive electrode of the second one-way conductive unit is connected to the positive electrode of the fourth one-way conductive unit;

[0015] The positive electrode of the first unidirectional conductive unit and the negative electrode of the second unidirectional conductive unit are the first input terminal of the power conversion module, the positive electrode of the third unidirectional conductive unit and the negative electrode of the fourth unidirectional conductive unit are the second input terminal of the power conversion module, the negative electrode of the first unidirectional conductive unit and the negative electrode of the third unidirectional conductive unit are the first output terminal of the power conversion module, and the positive electrode of the second unidirectional conductive unit and the positive electrode of the fourth unidirectional conductive unit are the second output terminal of the power conversion module.

[0016] In this embodiment, each switch unit in the power conversion module has an active control function, so that the AC input current can be rectified and the input current harmonics and power factor can be improved.

[0017] Optionally, in one embodiment of the present invention, the totem pole power factor correction circuit further includes:

[0018] a fifth unidirectional single-pass unit, wherein the positive electrode of the fifth unidirectional single-pass unit is connected to the first output end of the power conversion module, and the negative electrode of the fifth unidirectional single-pass unit is connected to one end of the capacitor module;

[0019] A sixth unidirectional conductive unit, wherein the positive electrode of the sixth unidirectional conductive unit is connected to the other end of the capacitor module, and the negative electrode of the sixth unidirectional conductive unit is connected to the second output end of the power conversion module.

[0020] In this embodiment, by providing the fifth unidirectional single-pass unit and the sixth unidirectional conducting unit, backflow can be prevented when the AC input voltage is lower than the DC bus voltage, thereby protecting the circuit safety.

[0021] Optionally, in one embodiment of the present invention, the switch module includes a fifth switch unit and a sixth switch unit;

[0022] One end of the fifth switch unit is connected to one end of the sixth switch unit, and the other end of the fifth switch unit is connected to the other end of the sixth switch unit;

[0023] One end of the fifth switch unit and one end of the sixth switch unit are both connected to an input end of the power conversion module, and the other end of the fifth switch unit and the other end of the sixth switch unit are both connected to the connection point of the first capacitor and the second capacitor.

[0024] In this embodiment, two actively controlled switch units are used in the switch module to reduce the power loss during the circuit conduction process when realizing the voltage doubling function.

[0025] Optionally, in one embodiment of the present invention, the switch module includes a seventh switch unit, an eighth switch unit, a seventh unidirectional conduction unit and an eighth unidirectional conduction unit;

[0026] The seventh switch unit is connected in parallel with the seventh unidirectional conductive unit, and the eighth switch unit is connected in parallel with the eighth unidirectional conductive unit;

[0027] The positive electrode of the seventh unidirectional conductive unit is connected to the positive electrode of the eighth unidirectional conductive unit, the negative electrode of the seventh unidirectional conductive unit is connected to an input end of the power conversion module, and the negative electrode of the eighth unidirectional conductive unit is connected to the connection point of the first capacitor and the second capacitor.

[0028] In this embodiment, by using a switch unit and a unidirectional conduction unit in the switch module, the applicable working frequency of the switch module is increased, thereby improving working safety.

[0029] Optionally, in one embodiment of the present invention, the switch module includes a ninth switch unit, a ninth unidirectional conduction unit, a tenth unidirectional conduction unit, an eleventh unidirectional conduction unit and a twelfth unidirectional conduction unit;

[0030] The positive electrode of the ninth unidirectional conductive unit and the negative electrode of the tenth unidirectional conductive unit are connected in series to form a first branch;

[0031] The positive electrode of the eleventh one-way conducting unit and the negative electrode of the twelfth one-way conducting unit are connected in series to form a second branch;

[0032] The first branch and the second branch are both connected in parallel with the ninth switch unit;

[0033] The positive electrode of the ninth unidirectional conductive unit is connected to an input end of the power conversion module, and the positive electrode of the eleventh unidirectional conductive unit is connected to a connection point between the first capacitor and the second capacitor.

[0034] In this embodiment, four unidirectional conducting units and one switch unit are provided in the switch module to increase the response time of the switch module and reduce the circuit volume.

[0035] Optionally, in one embodiment of the present invention, the switch module is a relay.

[0036] In this embodiment, the relay has the advantages of simple structure, high safety and reliability, long service life and wide applicability, and does not generate conduction loss like an electronic switch when powered on, which can reduce the manufacturing and use costs of the drive control circuit.

[0037] Optionally, in one embodiment of the present invention, the totem pole power factor correction circuit further includes:

[0038] An AC voltage detection unit, used to detect the voltage waveform of the AC power supply;

[0039] A DC voltage detection unit, used to detect the bus voltage of the load;

[0040] A current detection unit, used to detect the current in the power conversion module;

[0041] A parameter detection unit, used to detect the working parameters of the load;

[0042] A main control unit is connected to the AC voltage detection unit, the DC voltage detection unit, the current detection unit and the parameter detection unit, and is used to determine the working mode of the totem pole power factor correction circuit according to the working parameters of the load and the bus voltage, and to control the power conversion module and the switch module according to the voltage waveform of the AC power supply and the current in the power conversion module to realize the working mode of the totem pole power factor correction circuit.

[0043] In this embodiment, the main control unit controls the working mode of the switch module and the power conversion module according to the working parameters of the load detected by the parameter detection unit, the current in the power conversion module detected by the current detection unit, the bus voltage detected by the DC voltage detection unit, and the output voltage of the power conversion module detected by the AC voltage detection unit to reduce the power module loss.

[0044] According to a second aspect of an embodiment of the present application, a driving device is provided, comprising:

[0045] The totem pole power factor correction circuit of the first aspect;

[0046] An inverter is used to convert the direct current obtained by the totem pole power factor correction circuit into alternating current.

[0047] According to a third aspect of an embodiment of the present application, a compressor is provided, comprising:

[0048] A motor driven by the driving device described in the second aspect.

[0049] According to a fourth aspect of an embodiment of the present application, an air-conditioning device is provided, comprising the compressor described in the third aspect.

[0050] The compressor according to the third aspect embodiment and the air conditioner according to the fourth aspect embodiment of the present invention have at least the following beneficial effects: current harmonics and power factor are improved, and the working mode can be switched according to the severity of the motor load, thereby being able to adapt to voltage requirements under different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the prior art solutions, the following introduction is made to the drawings of the relevant technical solutions in the embodiments of the present application or the prior art solutions. It should be understood that the drawings introduced below are only for the convenience of clearly expressing some embodiments of the technical solutions of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 Schematic diagram of the structure of a first totem pole power factor correction circuit according to an embodiment of the present invention;

[0053] Figure 2 Schematic diagram of the structure of a second totem pole power factor correction circuit according to an embodiment of the present invention;

[0054] Figure 3 A first control signal waveform diagram output by the main control unit in an embodiment of the present invention;

[0055] Figure 4 A second control signal waveform diagram output by the main control unit in an embodiment of the present invention;

[0056] Figure 5 In the uncontrolled rectification mode of the embodiment of the present invention Figure 1 An equivalent structural diagram of a circuit;

[0057] Figure 6 In the synchronous rectification mode of the embodiment of the present invention Figure 1 An equivalent structural diagram of a circuit;

[0058] Figure 7 is a third control signal waveform diagram output by the main control unit in an embodiment of the present invention;

[0059] Figure 8 In the high frequency mode of the embodiment of the present invention Figure 1 An equivalent structural diagram of a circuit;

[0060] Fig. 9 In the high frequency mode of the embodiment of the present invention Figure 1 Another equivalent structural diagram of the circuit;

[0061] Fig.10 In the embodiment of the present invention Fig. 9 An equivalent structural diagram of a circuit;

[0062] Fig.11 In the embodiment of the present invention Fig. 9 An equivalent structural diagram of a circuit;

[0063] Fig.12 In the synchronous rectification mode of the embodiment of the present invention Figure 1 Another circuit diagram of the circuit;

[0064] Fig.13 A schematic structural diagram of a third totem pole power factor correction circuit according to an embodiment of the present invention;

[0065] Fig.14 This is a schematic diagram of the structure of a first switch module in an embodiment of the present invention;

[0066] Fig.15 is a structural schematic diagram of a second switch module in an embodiment of the present invention;

[0067] Fig.16 is a schematic structural diagram of a third switch module in an embodiment of the present invention;

[0068] Fig.17 is a schematic structural diagram of a fourth switch module in an embodiment of the present invention;

[0069] Fig.18 A schematic structural diagram of a fourth totem pole power factor correction circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0070] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 creative work should fall within the scope of protection of the present application.

[0071] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0072] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0073] Reference Figure 1 An embodiment of the present invention provides a totem pole power factor correction circuit, which includes a power conversion module, an inductor module, a capacitor module and a switch module.

[0074] In an embodiment of the present invention, the power conversion module includes a plurality of unidirectional conduction units and a plurality of switch units, wherein the unidirectional conduction units are connected in the shape of a bridge, and each unidirectional conduction unit is connected in parallel with a switch unit. In an embodiment of the present invention, a diode can be used as a unidirectional conduction unit, or other devices with unidirectional conduction capability can be used as a unidirectional conduction unit; a device with controlled on-off capability such as a triode, a field effect transistor, or an insulated gate bipolar transistor can be used as a switch unit.

[0075] Optionally, in some embodiments, Figure 1 As shown, the power conversion module includes a first unidirectional conducting unit D1, a second unidirectional conducting unit D2, a third unidirectional conducting unit D3, a fourth unidirectional conducting unit D4, a first switch unit Q1, a second switch unit Q2, a third switch unit Q3 and a fourth switch unit Q4. The unidirectional conducting units are connected in the shape of a bridge, which means that the positive electrode of the first unidirectional conducting unit D1 is connected to the negative electrode of the second unidirectional conducting unit D2, the positive electrode of the third unidirectional conducting unit D3 is connected to the negative electrode of the fourth unidirectional conducting unit D4, the negative electrode of the first unidirectional conducting unit D1 is connected to the negative electrode of the third unidirectional conducting unit D3, and the positive electrode of the second unidirectional conducting unit D2 is connected to the positive electrode of the fourth unidirectional conducting unit D4. Each unidirectional conductive unit is connected in parallel with a switch unit, which means that the first unidirectional conductive unit D1 is connected in parallel with the first switch unit Q1, the second unidirectional conductive unit D2 is connected in parallel with the second switch unit Q2, the third unidirectional conductive unit D3 is connected in parallel with the third switch unit Q3, and the fourth unidirectional conductive unit D4 is connected in parallel with the fourth switch unit Q4.

[0076] In an embodiment of the present invention, in a power conversion module composed of devices such as a first unidirectional conductive unit D1 and a first switch unit Q1, the negative pole of the first unidirectional conductive unit D1 and the positive pole of the second unidirectional conductive unit D2 are the output ends of the power conversion module, and the positive pole of the first unidirectional conductive unit D1 and the positive pole of the third unidirectional conductive unit D3 are the input ends of the power conversion module.

[0077] like Figure 1As shown, the input end of the power conversion module is connected to the AC power supply AC through the inductor module L, and the output end of the power conversion module is connected to the load. The output end of the power conversion module is connected in parallel with the capacitor module. In an embodiment of the present invention, the capacitor module includes a first capacitor C1 and a second capacitor C2 connected in series. The switch module SW1 is connected across an input end of the power conversion module and the capacitor module. Specifically, one end of the switch module SW1 is connected to the positive electrode of the third unidirectional conduction unit D3 in the power conversion module, and the other end of the switch module SW1 is connected to the connection point of the first capacitor C1 and the second capacitor C2. The switch module SW1 has two states of on and off. When the switch module SW1 is on, the positive electrode of the third unidirectional conduction unit D3 is connected to the connection point of the first capacitor C1 and the second capacitor C2. When the switch module SW1 is off, the positive electrode of the third unidirectional conduction unit D3 is disconnected from the connection point of the first capacitor C1 and the second capacitor C2.

[0078] In some optional embodiments, such as Figure 2 As shown, the totem pole power factor correction circuit also includes a parameter detection unit with a function of detecting the working parameters of the load, an AC voltage detection unit with a function of detecting the voltage waveform of the AC power supply, a DC voltage detection unit with a function of detecting the bus voltage of the load, a current detection module with a function of detecting the current input from the AC power supply to the power conversion module, and a main control unit for controlling the working modes of the power conversion module and the switch module according to the detected working parameters of the load.

[0079] Specifically, Figure 2 As shown, the internal resistance of the AC voltage detection unit, the DC voltage detection unit and the parameter detection unit is relatively large, that is, they can be regarded as an open circuit when connected in parallel to the circuit, and the internal resistance of the current detection unit is relatively small, and it can be regarded as a short circuit when connected in series to the circuit. Among them, the AC voltage detection unit can be a voltage sensor for detecting the voltage waveform of the AC power supply; the DC voltage detection unit can be a voltage sensor for detecting the bus voltage of the load; the current detection unit can be a current sensor for detecting the current flowing through the power conversion module; the parameter detection unit can be a power meter or a current sensor. When the load is a motor, the parameter detection unit can also be a pressure sensor or a frequency sensor. These sensors can detect the power, current, pressure or frequency of the load respectively, that is, the working parameters detected by the parameter detection unit include one of power, current, pressure or frequency.

[0080] The main control unit can be a single-chip microcomputer, and the main control unit is connected to the AC voltage detection unit, the DC voltage detection unit, the current detection unit, and the parameter detection unit, so as to receive the voltage waveform of the AC power supply, the current flowing through the power conversion module, the bus voltage of the load, and the operating parameters of the load detected by these units. The main control unit is also connected to the control end of the first switch unit Q1, the control end of the second switch unit Q2, the control end of the third switch unit Q3, the control end of the fourth switch unit Q4, and the control end of the switch module SW1 through the IO interface. Figure 2 The connection between the main control unit and the control terminal of the first switch unit Q1 is not specifically drawn, but arrow symbols are used to indicate that the main control unit outputs a control signal to them.

[0081] The main control unit can control the power correction circuit to switch between different topological structures by calling the control program. Specifically, first determine the working mode of the power conversion module and the switch module that needs to be controlled according to the working parameters of the load, and then drive the first switch unit Q1, the second switch unit Q2, the third switch unit Q3, the fourth switch unit Q4 and the switch module SW1 to change the on-off state by executing the program to output the corresponding waveform, forming different on-off state combinations, so that the power conversion module and the switch module work in different working modes.

[0082] In an embodiment of the present invention, the main control unit determines the working mode of the control power conversion module and the switch module according to the working parameters of the load, wherein the working modes of the power conversion module and the switch module include a non-voltage doubling working mode and a voltage doubling working mode, the non-voltage doubling working mode includes a high-frequency switching mode, and the voltage doubling working mode includes an uncontrolled rectification mode and a synchronous rectification mode. Specifically, the main control unit sets successively increasing working parameter thresholds P1, P2, P3 and P4, that is, P1<P2<P3<P4, to form a first working parameter interval [P1, P2], a second working interval [P2, P3] and a third working parameter interval [P3, P4]. If the working parameters of the load are within the first working parameter interval [P1, P2], the main control unit determines that the control power conversion module and the switch module operate in a non-voltage doubling mode; if the working parameters of the load operate in an interval greater than P2, the main control unit determines that the control power conversion module and the switch module operate in a voltage doubling mode. Among them, in the voltage doubling mode, if the working parameters of the load are within the second working parameter range [P2, P3], the main control unit controls the power conversion module and the switch module to operate in the uncontrolled rectification mode; if the working parameters of the load are within the third working parameter range [P3, P4], the main control unit determines to control the power conversion module and the switch module to operate in the synchronous rectification mode.

[0083] Figure 3Q1 in the figure represents the control signal waveform output to the first switch unit Q1, Q2 represents the control signal waveform output to the second switch unit Q2, Q3 represents the control signal waveform output to the third switch unit Q3, Q4 represents the control signal waveform output to the fourth switch unit Q4, and SW1 represents the control signal waveform output to the switch module SW1. In this embodiment, the switch module or a switch unit receives a high level output by the main control unit and becomes a conducting state, and the switch module or a switch unit receives a low level output by the main control unit and becomes a shutoff state. Figure 3 Us in the figure represents the voltage waveform across the alternating current power source AC, and Is represents the current waveform input from the alternating current power source AC to the power conversion module.

[0084] Specifically, when the AC voltage is large or the bus voltage requirement is small, refer to Figure 3 In the left half of the main control unit, the main control unit outputs a low level to the switch module SW1, and the switch module SW1 is turned off, so that the power conversion module and the switch module SW1 work in the conventional boost mode; when the AC voltage is low or the bus voltage is large due to large load demand, refer to Figure 3 In the right half of the circuit, the main control unit outputs a high level to the switch module SW1, and the switch module SW1 is turned on, so that the power conversion module and the switch module SW1 work in the voltage doubling mode, thereby solving the problems of large loss and weak magnetic depth caused by changes in input voltage and load demand to a certain extent.

[0085] Figure 4 Q1 in the figure represents the control signal waveform output to the first switch unit Q1, Q2 represents the control signal waveform output to the second switch unit Q2, Q3 represents the control signal waveform output to the third switch unit Q3, Q4 represents the control signal waveform output to the fourth switch unit Q4, and SW1 represents the control signal waveform output to the switch module SW1. In this embodiment, the switch module or a switch unit receives a high level output by the main control unit and becomes a conducting state, and the switch module or a switch unit receives a low level output by the main control unit and becomes a shutoff state. Figure 3 Us in the figure represents the voltage waveform across the alternating current power source AC, and Is represents the voltage waveform input from the alternating current power source AC to the power conversion module.

[0086] When the main control unit controls the power conversion module and the switch module to work in the uncontrolled rectification mode according to the load demand, refer to Figure 4 In the left half of the main control unit, the main control unit outputs a high level to the switch module SW1, so that the switch module SW1 is turned on; when the main control unit outputs a low level to the switch units Q1, Q2, Q3 and Q4 respectively, Figure 1 The circuit topology shown is represented by Figure 5 shown.

[0087] When the main control unit controls the power conversion module and the switch module to work in the synchronous rectification mode according to the load demand, refer to Figure 4 In the right half of the circuit, the main control unit outputs a high level to the switch module SW1, turning on the switch module SW1. When the AC power supply is in the positive half cycle, the main control unit outputs a high level to the switch unit Q1, turning on the switch unit Q1, and the main control unit outputs a low level to the switch units Q2, Q3 and Q4, turning off the switch units Q2, Q3 and Q4. When the AC power supply is in the negative half cycle, the main control unit outputs a high level to the switch unit Q2, turning on the switch unit Q2, and the main control unit outputs a low level to the switch units Q1, Q3 and Q4, turning off the switch units Q1, Q3 and Q4. Figure 4 In the right half of the waveform, Figure 1 The circuit topology shown is represented by Figure 6 shown.

[0088] Figure 7 The left half of the diagram shows the control signal waveform output by the main control unit to each switch unit and switch module in the power conversion module when the main control unit controls the power conversion module and the switch module to work in the high-frequency switching mode. Figure 7 The right half of shows the control signal waveform output by the main control unit to each switch unit and switch module in the power conversion module when the main control unit controls the power conversion module and the switch module to work in the synchronous rectification mode.

[0089] Figure 7 Q1 in the figure represents the control signal waveform output to the first switch unit Q1, Q2 represents the control signal waveform output to the second switch unit Q2, Q3 represents the control signal waveform output to the third switch unit Q3, Q4 represents the control signal waveform output to the fourth switch unit Q4, and SW1 represents the control signal waveform output to the switch module SW1. In the embodiment of the present invention, the switch module or a switch unit receives a high level output by the main control unit and becomes a conducting state, and the switch module or a switch unit receives a low level output by the main control unit and becomes a shutoff state. Figure 7 Us in the figure represents the voltage waveform across the alternating current power source AC, and Is represents the voltage waveform input from the alternating current power source AC to the power conversion module.

[0090] When the main control unit controls the power conversion module and the switch module to work in high-frequency switching mode according to load requirements, refer to Figure 7 In the left half of the main control unit, the main control unit outputs a low level to the switch module SW1, so that the switch module SW1 is turned off; when the main control unit detects that the voltage waveform of the AC power supply is in the positive half cycle, the main control unit outputs a low level to the third switch unit Q3 and outputs a high level to the fourth switch unit Q4, so that the third switch unit Q3 is turned off and the fourth switch unit Q4 is turned on, that is, when the voltage waveform of the AC power supply is in the positive half cycle, Figure 1 The circuit topology shown is represented by Figure 8 When the main control unit detects that the voltage waveform of the AC power supply is in the negative half cycle, the main control unit outputs a high level to the third switch unit Q3 and a low level to the fourth switch unit Q4, so that the third switch unit Q3 is turned on and the fourth switch unit Q4 is turned off. That is, when the voltage waveform of the AC power supply is in the negative half cycle, Figure 1 The circuit topology shown is represented by Fig. 9 form.

[0091] The main control unit collects the voltage waveform output by the AC power source AC, and obtains a PWM waveform corresponding to the voltage waveform of the AC power source AC by sampling and comparing the internal analog circuit or executing an algorithm by a digital circuit. In an embodiment of the present invention, the voltage waveform of the AC power source AC may be a sine wave, that is, the PWM waveform obtained by the main control unit may be an SPWM waveform. The main control unit uses the obtained PWM waveform as a control waveform output to the first switch unit Q1 and the second switch unit Q2.

[0092] In the embodiment of the present invention, the PWM waveform output by the main control unit to the first switch unit Q1 and the PWM waveform output to the second switch unit Q2 are in opposite phases. Figure 7 The duty cycle of the PWM waveform output by the main control unit to the first switch unit Q1 is minimum at the voltage zero crossing point and maximum at the voltage peak / valley value, while the duty cycle of the PWM waveform output by the main control unit to the second switch unit Q2 is maximum at the voltage zero crossing point and minimum at the voltage peak / valley value.

[0093] In the embodiment of the present invention, the frequency of the PWM waveform can be determined according to the device type of the first switch unit Q1 and the second switch unit Q2. For example, if field effect transistors are used as the first switch unit Q1 and the second switch unit Q2, the frequency of the PWM waveform can be 30Khz-100Khz, and if insulated gate bipolar transistors are used as the first switch unit Q1 and the second switch unit Q2, the frequency of the PWM waveform can be 3Khz-30Khz.

[0094] Driven by the PWM waveform, the first switch unit Q1 and the second switch unit Q2 are alternately switched on and off at a high frequency during the entire cycle of the voltage waveform of the AC power supply. Figure 7 , the PWM waveform driving the first switch unit Q1 is in phase with the PWM waveform driving the second switch unit Q2, so during the alternating on and off of the first switch unit Q1 and the second switch unit Q2, when the first switch unit Q1 is turned on, the second switch unit Q2 is turned off, and when the first switch unit Q1 is turned off, the second switch unit Q2 is turned on. Fig. 9Take the circuit shown in as an example, at this time, the voltage output by the AC power source AC is in the negative half cycle. In this embodiment, the voltage of the cathode of the fourth switch unit Q4 is higher than the voltage of the anode of the first switch unit Q1. When the first switch unit Q1 is turned on and the second switch unit Q2 is turned off, Fig. 9 The topology of the circuit shown is equivalent to Fig.10 As shown, at this time, both ends of the inductor module L are connected to the AC power supply AC, the AC power supply AC charges the inductor module L, and the capacitor module supplies power to the load; when the first switch unit Q1 is turned off and the second switch unit Q2 is turned on, Fig. 9 The topology of the circuit shown is equivalent to Fig.11 As shown, at this time, the inductor module L, the first capacitor C1 and the second capacitor C2 are connected in series, the inductor module L discharges to charge the first capacitor C1 and the second capacitor C2, and the inductor module L also discharges to supply power to the load. Fig.10 and Fig.11 Under the two topological structures, the two ends of the capacitor module can obtain a voltage higher than the output voltage of the AC power supply AC, achieving a boost effect, and because the control waveform output by the second switch unit Q2 when the main control unit turns on the first switch unit Q1 is a PWM waveform corresponding to the voltage waveform of the AC power supply AC, refer to Figure 7 , the waveform of the current Is input from the AC power supply AC to the power conversion module is also a sine wave, thereby improving the input current harmonics and power factor.

[0095] Fig.10 and Fig.11 The circuit equivalent topology shown is based on Fig. 9 The circuit shown is obtained by analyzing the situation that the output voltage of the AC power supply is in the negative half cycle. Due to the symmetry of the circuit, when the output voltage of the AC power supply is in the positive half cycle, that is, Figure 8 The circuit shown can also be analyzed to obtain the same conclusion, that is, a voltage higher than the output voltage of the AC power supply AC can be obtained at both ends of the capacitor module to achieve a boost effect, and the waveform of the current Is input from the AC power supply AC to the power conversion module is also a sine wave, thereby improving the input current harmonics and power factor.

[0096] When the main control unit controls the power conversion module and the switch module to work in the synchronous rectification mode, refer to Figure 7 In the right half of the main control unit, the main control unit outputs a high level to the switch module SW1, so that the switch module SW1 is turned on; the main control unit outputs a high level to the switch module SW1, and the main control unit outputs a low level to the third switch unit Q3 and the fourth switch unit Q4, so that the third switch unit Q3 and the fourth switch unit Q4 are turned off. Figure 1 The circuit topology shown is equivalent to Fig.12 , Fig.12In the structure shown, the first unidirectional conductive unit D1 and the second unidirectional conductive unit D2 can be independently controlled by the main control unit to perform synchronous rectification.

[0097] Depend on Fig.12 It can be seen from the circuit structure shown that as the positive and negative half-cycles of the alternating current power supply AC switch, the current flowing through the power conversion module either flows through the first unidirectional conduction unit D1 or flows through the second unidirectional conduction unit D2. The main control unit can determine whether the current flows through the first unidirectional conduction unit D1 or the second unidirectional conduction unit D2 according to the direction of the current.

[0098] When the main control unit detects that current flows through the first unidirectional conduction unit D1, the main control unit outputs a high level to the first switch unit Q1, so that the first switch unit Q1 is turned on. If the main control unit does not detect that current flows through the first unidirectional conduction unit D1, the main control unit outputs a low level to the first switch unit Q1, so that the first switch unit Q1 is turned off. When the main control unit detects that current flows through the second unidirectional conduction unit D2, the main control unit outputs a high level to the second switch unit Q2, so that the second switch unit Q2 is turned on. If the main control unit does not detect that current flows through the second unidirectional conduction unit D2, the main control unit outputs a low level to the second switch unit Q2, so that the second switch unit Q2 is turned off. When the first switch unit Q1 is turned on and the second switch unit Q2 is turned off, it is equivalent to the AC power supply AC being connected to the two ends of the first capacitor C1 through the inductor module L to charge the first capacitor C1; when the first switch unit Q1 is turned off and the second switch unit Q2 is turned on, it is equivalent to the AC power supply AC being connected to the two ends of the second capacitor C2 through the inductor module L to charge the second capacitor C2. The two ends of the first capacitor C1 and the two ends of the second capacitor C2 can respectively obtain the voltage of the AC capacitor AC. The capacitor module formed by the first capacitor C1 and the second capacitor C2 in series can obtain a voltage equivalent to twice the output voltage of the AC capacitor AC at its two ends, thereby achieving a voltage doubling effect.

[0099] In summary, the power conversion module and the switch module in the embodiment of the present invention enable the totem pole power factor correction circuit to switch between different topologies to meet different load requirements in conjunction with different control timings, thereby reducing the power module loss in the circuit. The beneficial effects of the totem pole power factor correction circuit in the embodiment of the present invention can be summarized as follows: when the operating parameters of the load such as power, current, pressure or frequency are in a smaller first operating parameter interval [P1, P2], the load is lightly loaded, under the control of the main control unit, the power conversion module and the switch module operate in a high-frequency switching mode, so that the totem pole power factor correction circuit can control the input current waveform to follow the input voltage change, thereby improving the input current harmonics and power factor, raising the bus voltage, and achieving boost output; when the operating parameters of the load such as power, current, pressure or frequency are in a larger second operating parameter interval [P2, P3] or a third operating interval [P3, P4], the load is heavily loaded, under the control of the main control unit, the power conversion module and the switch module can operate in an uncontrolled rectification mode or a synchronous rectification mode, and the totem pole power factor correction circuit can achieve a double voltage output and has a strong load carrying capacity. The totem pole power factor correction circuit in the embodiment of the present invention can switch between different topological structures to meet different load requirements in conjunction with different control timings, thereby reducing the power module loss in the circuit.

[0100] Optionally, in some embodiments, Fig.13 The circuit shown in Figure 1 Two unidirectional conduction units are added to the circuit shown. Figure 1 A fifth unidirectional conductive unit D5 and a sixth unidirectional conductive unit D6 are additionally provided in the circuit shown, wherein the positive electrode of the fifth unidirectional conductive unit D5 is connected to an output end of the power conversion module, and the negative electrode of the fifth unidirectional conductive unit D5 is connected to one end of the capacitor module; the positive electrode of the sixth unidirectional conductive unit D6 is connected to the other end of the capacitor module, and the negative electrode of the sixth unidirectional conductive unit D6 is connected to the other output end of the power conversion module.

[0101] This embodiment can prevent backflow when the AC input voltage is lower than the bus voltage by adding the fifth unidirectional conductive unit D5 and the sixth unidirectional conductive unit D6, thereby protecting the circuit safety.

[0102] Optionally, in some embodiments, the switch module can switch between two states, an on state and an off state, under the control of the main control unit, and one switch unit or two switch units can be used to construct the switch module.

[0103] like Fig.14 In the circuit shown, two switch units are used to build a switch module. Figure 1 The switch module SW1 in the circuit is replaced by a fifth switch unit Q5 and a sixth switch unit Q6.

[0104] Fig.14 In the circuit shown, the fifth switch unit Q5 and the sixth switch unit Q6 are connected in parallel, one end of the parallel circuit is connected to the positive electrode of the third unidirectional conductive unit D3, and the other end of the parallel circuit is connected to the connection point of the first capacitor C1 and the second capacitor C2. Fig.14 The circuit composed of the fifth switch unit Q5 and the sixth switch unit Q6 is Figure 1 The switch module SW1 in is equivalent.

[0105] One output end of the main control unit is connected to the control end of the fifth switch unit Q5, and one output end of the main control unit is connected to the control end of the sixth switch unit Q6. Fig.14 In the circuit shown, the connection lines between the fifth switch unit Q5, the sixth switch unit Q6 and the main control unit are omitted.

[0106] Fig.14 In the circuit shown, the on-off state of the fifth switch unit Q5 and the sixth switch unit Q6 determines the on-off state of the switch module SW1, that is, if either the fifth switch unit Q5 or the sixth switch unit Q6 is turned on, the switch module SW1 is turned on, and if both the fifth switch unit Q5 and the sixth switch unit Q6 are turned off, the switch module SW1 is turned off.

[0107] In an embodiment of the present invention, when the main control unit determines that the control power conversion module and the switch module operate in a non-voltage doubling mode, the main control unit outputs a low level to the fifth switch unit Q5 and the sixth switch unit Q6 respectively so that the fifth switch unit Q5 and the sixth switch unit Q6 are both turned off, and thus the equivalent switch module SW1 is turned off to achieve a high-frequency switching mode.

[0108] In the embodiment of the present invention, when the main control unit determines that the control power conversion module and the switch module operate in the voltage doubling mode, the main control unit can output a high level to the fifth switch unit Q5 and the sixth switch unit Q6 respectively, so that the fifth switch unit Q5 and the sixth switch unit Q6 are both turned on, so the equivalent switch module SW1 is turned on to realize the synchronous rectification mode. The main control unit can also output a high level to the fifth switch unit Q5 when the voltage output by the alternating current power supply AC is in the positive half cycle, so that the fifth switch unit Q5 is turned on, and the equivalent switch module SW1 is turned on to realize the high-frequency switching mode; when the voltage output by the alternating current power supply AC is in the negative half cycle, the main control unit outputs a high level to the sixth switch unit Q6, so that the sixth switch unit Q6 is turned on, and the equivalent switch module SW1 is turned on to realize the high-frequency switching mode.

[0109] like Fig.15 In the circuit shown, two switch units can be used to build a switch module. Figure 1The switch module SW1 in the circuit is replaced with a circuit consisting of a seventh switch unit Q7, an eighth switch unit Q8, a seventh unidirectional conduction unit D7 and an eighth unidirectional conduction unit D8, and the following is obtained: Fig.15 The circuit shown.

[0110] exist Fig.15 In the circuit shown, one end of the seventh switch unit Q7 is connected to one end of the eighth switch unit Q8, the other end of the seventh switch unit Q7 is connected to the positive electrode of the third unidirectional conduction unit D3, and the other end of the eighth switch unit Q8 is connected to the connection point of the first capacitor C1 and the second capacitor C2. The seventh unidirectional conduction unit D7 is connected in parallel with the seventh switch unit Q7, and the positive electrode of the seventh unidirectional conduction unit D7 is connected to the positive electrode of the third unidirectional conduction unit D3. The eighth unidirectional conduction unit D8 is connected in parallel with the eighth switch unit Q8, and the negative electrode of the eighth unidirectional conduction unit D8 is connected to the connection point of the first capacitor C1 and the second capacitor C2. That is, Fig.15 The circuit composed of the seventh switch unit Q7, the eighth switch unit Q8, the seventh unidirectional conduction unit D7 and the eighth unidirectional conduction unit D8 is Figure 1 The switch module SW1 in is equivalent.

[0111] One output end of the main control unit is connected to the control end of the seventh switch unit Q7, and one output end of the main control unit is connected to the control end of the eighth switch unit Q8. Fig.15 In the circuit shown, the connection lines between the seventh switch unit Q7, the eighth switch unit Q8 and the main control unit are omitted.

[0112] like Fig.15 In the circuit shown, when one of the seventh switch unit Q7 and the eighth switch unit Q8 is turned on and the other is turned off, a unidirectional conduction circuit is formed with the seventh unidirectional conduction unit D7 and the eighth unidirectional conduction unit D8. Specifically: Fig.15 In the circuit, when the seventh switch unit Q7 is turned on and the eighth switch unit Q8 is turned off, the seventh switch unit Q7 and the eighth unidirectional conduction unit D8 form a unidirectional conduction circuit from left to right; when the seventh switch unit Q7 is turned off and the eighth switch unit Q8 is turned on, the eighth switch unit Q8 and the seventh unidirectional conduction unit D7 form a unidirectional conduction circuit from right to left.

[0113] In an embodiment of the present invention, when the main control unit determines that the control power conversion module and the switch module operate in a non-voltage doubling mode, the main control unit outputs a low level to the seventh switch unit Q7 and the eighth switch unit Q8 respectively, so that the seventh switch unit Q7 and the eighth switch unit Q8 are both turned off, and thus the equivalent switch module SW1 is turned off to achieve a high-frequency switching mode.

[0114] In the embodiment of the present invention, when the main control unit determines that the control power conversion module and the switch module work in the voltage doubling mode, the main control unit can output a high level to the seventh switch unit Q7 and the eighth switch unit Q8 respectively, so that the seventh switch unit Q7 and the eighth switch unit Q8 are both turned on, so the equivalent switch module SW1 is turned on to realize the voltage doubling mode. The main control unit can also output a high level to the seventh switch unit Q7 when the voltage output by the alternating current power source AC is in the positive half cycle, so that the seventh switch unit Q7 is turned on. Since the voltage output by the alternating current power source AC is in the positive half cycle, the voltage applied to the negative electrode of the seventh unidirectional conduction unit D7 is the positive voltage of the alternating current power source AC, and the voltage applied to the negative electrode of the eighth unidirectional conduction unit D8 is the voltage of the second capacitor C2. After discharge, the voltage of the second capacitor C2 is lower than the positive voltage of the alternating current power source AC. Therefore, the seventh switch unit Q7 and the eighth unidirectional conduction unit D8 form a unidirectional conduction circuit from left to right, and the equivalent switch module SW1 is turned on to realize high-frequency switching. Mode; the main control unit can also output a high level to the eighth switch unit Q8 when the voltage output by the alternating current power supply AC is in the negative half cycle, so that the eighth switch unit Q8 is turned on. Since the voltage output by the alternating current power supply AC is in the negative half cycle, the voltage applied to the cathode of the seventh unidirectional conduction unit D7 is the negative voltage of the alternating current power supply AC, and the voltage applied to the cathode of the eighth unidirectional conduction unit D8 is the voltage of the second capacitor C2, and the voltage of the second capacitor C2 is higher than the negative voltage of the alternating current power supply AC. Therefore, the eighth switch unit Q8 and the seventh unidirectional conduction unit D7 form a unidirectional conduction circuit from right to left, and the equivalent switch module SW1 is turned on to realize the high-frequency switching mode.

[0115] like Fig.16 In the circuit shown, a switch unit can be used to build a switch module. Figure 1 The switch module SW1 in the circuit is replaced with a circuit consisting of a ninth switch unit Q9, a ninth unidirectional conduction unit D9, a tenth unidirectional conduction unit D10, an eleventh unidirectional conduction unit D11 and a twelfth unidirectional conduction unit D12, and the following is obtained: Fig.16 The circuit shown.

[0116] Fig.16 In the circuit shown, the positive electrode of the ninth switch unit Q9 and the negative electrode of the tenth unidirectional conduction unit D10 are connected in series to form a first branch, the positive electrode of the eleventh unidirectional conduction unit D11 and the negative electrode of the twelfth unidirectional conduction unit D12 are connected in series to form a second branch, and the first branch, the second branch and the ninth switch unit Q9 are connected in parallel. The positive electrode of the ninth unidirectional conduction unit D9 is connected to the positive electrode of the third unidirectional conduction unit D3, and the positive electrode of the eleventh unidirectional conduction unit D11 is connected to the connection point of the first capacitor C1 and the second capacitor C2, that is, Fig.16The circuit composed of the ninth switch unit Q9, the ninth unidirectional conduction unit D9, the tenth unidirectional conduction unit D10, the eleventh unidirectional conduction unit D11 and the twelfth unidirectional conduction unit D12 is Figure 1 The switch module SW1 in is equivalent.

[0117] Fig.16 In the circuit shown, the ninth unidirectional conducting unit D9, the tenth unidirectional conducting unit D10, the eleventh unidirectional conducting unit D11 and the twelfth unidirectional conducting unit D12 form a full-bridge rectifier, which can rectify the current flowing through the ninth switch unit Q9.

[0118] An output terminal of the main control unit is connected to the control terminal of the ninth switch unit Q9. Fig.16 The connection line between the ninth switch unit Q9 and the main control unit is omitted in the circuit shown.

[0119] exist Fig.16 In the circuit shown, the on-off state of the ninth switch unit Q9 determines the on-off state of the switch module SW1 , that is, the ninth switch unit Q9 is turned on to realize the switch module SW1 is turned on, and the ninth switch unit Q9 is turned off to realize the switch module SW1 is turned off.

[0120] In the embodiment of the present invention, when the main control unit determines that the control power conversion module and the switch module operate in the non-voltage doubling mode, the main control unit outputs a low level to the ninth switch unit Q9, so that the ninth switch unit Q9 is turned off, and thus the equivalent switch module SW1 is turned off to realize the high-frequency switching mode in the non-voltage doubling mode. When the main control unit determines that the control power conversion module and the switch module operate in the voltage doubling mode, the main control unit outputs a high level to the ninth switch unit Q9, so that the ninth switch unit Q9 is turned on, and thus the equivalent switch module SW1 is turned on to realize the voltage doubling mode.

[0121] In addition, when the totem pole power factor correction circuit adopts Fig.13 When the circuit is shown, the switch module SW1 can also be replaced by a relay. Fig.17 As shown, one output terminal of the main control unit is connected to the coil in the relay SW2. Fig.17 The connection line between the coil of relay SW2 and the main control unit is omitted in the circuit shown.

[0122] exist Fig.17 In the circuit shown, the on-off state of the relay SW2 determines the on-off state of the switch module SW1 , that is, the relay SW2 is turned on to realize the switching module SW1 is turned on, and the relay SW2 is turned off to realize the switching module SW1 is turned off.

[0123] In the embodiment of the present invention, when the main control unit determines that the control power conversion module and the switch module operate in the non-voltage doubling mode, the main control unit outputs a low level to the relay SW2, so that the relay SW2 is turned off, and thus the equivalent switch module SW1 is turned off, so as to realize the high-frequency switching mode in the non-voltage doubling mode. When the main control unit determines that the control power conversion module and the switch module operate in the voltage doubling mode, the main control unit outputs a high level to the relay SW2, so that the relay SW2 is turned on, and thus the equivalent switch module SW1 is turned on to realize the voltage doubling mode.

[0124] Optionally, in some embodiments, Fig.18 As shown, the totem pole power factor correction circuit in the embodiment is connected to the inverter and the motor in sequence, and the totem pole power factor correction circuit outputs a driving signal to the inverter, and the inverter drives the motor to work, and the motor can be used for a compressor. That is, the load to be driven by the totem pole power factor correction circuit in the embodiment can be clearly the inverter and the motor. Fig.18 The compressor shown has the advantages of the totem pole power factor correction circuit in the embodiment, that is, switching between different topological structures to cooperate with different control timings to meet different load requirements, thereby reducing the power module loss in the circuit.

[0125] Optionally, in some embodiments, Fig.18 The compressor shown can be applied to air conditioning equipment.

[0126] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above implementation. As long as the technical effect of the present invention is achieved by the same means, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention. Within the scope of protection of the present invention, its technical scheme and / or implementation method may have various modifications and changes.

Claims

1. A totem pole power factor correction circuit, characterized in that: include: The power conversion module comprises a plurality of unidirectional conductive units connected in a bridge shape, each of the unidirectional conductive units being connected in parallel with a switch unit; The input end of the power conversion module is used to connect to an AC power source, and the output end of the power conversion module is used to connect to a load; An inductor module, arranged between the power conversion module and the AC power supply; A capacitor module, comprising a first capacitor and a second capacitor connected in series; the capacitor module is connected in parallel with the output end of the power conversion module; a switch module, wherein one end of the switch module is connected to an input end of the power conversion module, and the other end of the switch module is connected to a connection point between the first capacitor and the second capacitor; Wherein, the power conversion module includes a first unidirectional conduction unit, a second unidirectional conduction unit, a third unidirectional conduction unit, a fourth unidirectional conduction unit, a first switch unit, a second switch unit, a third switch unit and a fourth switch unit; The first unidirectional conductive unit is connected in parallel with the first switch unit, the second unidirectional conductive unit is connected in parallel with the second switch unit, the third unidirectional conductive unit is connected in parallel with the third switch unit, and the fourth unidirectional conductive unit is connected in parallel with the fourth switch unit; The positive electrode of the first one-way conductive unit is connected to the negative electrode of the second one-way conductive unit, the positive electrode of the third one-way conductive unit is connected to the negative electrode of the fourth one-way conductive unit, the negative electrode of the first one-way conductive unit is connected to the negative electrode of the third one-way conductive unit, and the positive electrode of the second one-way conductive unit is connected to the positive electrode of the fourth one-way conductive unit; The positive electrode of the first unidirectional conductive unit and the negative electrode of the second unidirectional conductive unit are the first input end of the power conversion module, the positive electrode of the third unidirectional conductive unit and the negative electrode of the fourth unidirectional conductive unit are the second input end of the power conversion module, the negative electrode of the first unidirectional conductive unit and the negative electrode of the third unidirectional conductive unit are the first output end of the power conversion module, and the positive electrode of the second unidirectional conductive unit and the positive electrode of the fourth unidirectional conductive unit are the second output end of the power conversion module; The working modes of the power conversion module and the switch module include a non-voltage doubling working mode and a voltage doubling working mode. The non-voltage doubling working mode includes a high-frequency switching mode, and the voltage doubling working mode includes an uncontrolled rectification mode and a synchronous rectification mode.

2. The totem pole power factor correction circuit according to claim 1, characterized in that: The totem pole power factor correction circuit also includes: a fifth unidirectional single-pass unit, wherein the positive electrode of the fifth unidirectional single-pass unit is connected to the first output end of the power conversion module, and the negative electrode of the fifth unidirectional single-pass unit is connected to one end of the capacitor module; A sixth unidirectional conductive unit, wherein the positive electrode of the sixth unidirectional conductive unit is connected to the other end of the capacitor module, and the negative electrode of the sixth unidirectional conductive unit is connected to the second output end of the power conversion module.

3. The totem pole power factor correction circuit according to claim 1, characterized in that: The switch module includes a fifth switch unit and a sixth switch unit; One end of the fifth switch unit is connected to one end of the sixth switch unit, and the other end of the fifth switch unit is connected to the other end of the sixth switch unit; One end of the fifth switch unit and one end of the sixth switch unit are both connected to an input end of the power conversion module, and the other end of the fifth switch unit and the other end of the sixth switch unit are both connected to the connection point of the first capacitor and the second capacitor.

4. The totem pole power factor correction circuit according to claim 1, characterized in that: The switch module includes a seventh switch unit, an eighth switch unit, a seventh unidirectional conduction unit and an eighth unidirectional conduction unit; The seventh switch unit is connected in parallel with the seventh unidirectional conductive unit, and the eighth switch unit is connected in parallel with the eighth unidirectional conductive unit; The positive electrode of the seventh unidirectional conductive unit is connected to the positive electrode of the eighth unidirectional conductive unit, the negative electrode of the seventh unidirectional conductive unit is connected to an input end of the power conversion module, and the negative electrode of the eighth unidirectional conductive unit is connected to the connection point of the first capacitor and the second capacitor.

5. The totem pole power factor correction circuit according to claim 1, characterized in that: The switch module includes a ninth switch unit, a ninth unidirectional conductive unit, a tenth unidirectional conductive unit, an eleventh unidirectional conductive unit and a twelfth unidirectional conductive unit; The positive electrode of the ninth unidirectional conductive unit and the negative electrode of the tenth unidirectional conductive unit are connected in series to form a first branch; The positive electrode of the eleventh one-way conducting unit and the negative electrode of the twelfth one-way conducting unit are connected in series to form a second branch; The first branch and the second branch are both connected in parallel with the ninth switch unit; The positive electrode of the ninth unidirectional conductive unit is connected to an input end of the power conversion module, and the positive electrode of the eleventh unidirectional conductive unit is connected to a connection point between the first capacitor and the second capacitor.

6. The totem pole power factor correction circuit according to claim 1, characterized in that: The switch module is a relay.

7. The totem pole power factor correction circuit according to claim 1, characterized in that: The totem pole power factor correction circuit also includes: An AC voltage detection unit, used to detect the voltage waveform of the AC power supply; A DC voltage detection unit, used to detect the bus voltage of the load; A current detection unit, used to detect the current in the power conversion module; A parameter detection unit, used to detect the working parameters of the load; A main control unit is connected to the AC voltage detection unit, the DC voltage detection unit, the current detection unit and the parameter detection unit, and is used to determine the working mode of the totem pole power factor correction circuit according to the working parameters of the load and the bus voltage, and to control the power conversion module and the switch module according to the voltage waveform of the AC power supply and the current in the power conversion module to realize the working mode of the totem pole power factor correction circuit.

8. A driving device, characterized in that: include: The totem pole power factor correction circuit as claimed in any one of claims 1 to 7; An inverter is used to convert the direct current obtained by the totem pole power factor correction circuit into alternating current.

9. A compressor, characterized in that: include: A motor driven by the driving device according to claim 8.

10. An air conditioning device, characterized in that: Comprising the compressor of claim 9.

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