Converter module, converter system, and chip

Abstract

The utility model relates to a converter module and a converter system, the converter module comprises a totem pole circuit, an isolation circuit and an output circuit which are connected in series, and the isolation circuit is connected between the totem pole circuit and the output circuit. The first input end and the second input end of the totem pole circuit are connected with any two phase lines in a three-phase power supply, or a phase line and a zero line of a single-phase power supply. The modular circuit of a three-level structure composed of a totem pole circuit, an isolation circuit and an output circuit can be applied to a single-phase power supply or a three-phase power supply, the output circuit can be connected in series or in parallel to achieve various power or voltage specifications, good scalability is achieved, one converter module can achieve production full-coverage testing, and the production cost is reduced. And the reliability and the cost performance of equipment testing are greatly improved. Moreover, the three-level structure of the converter module is a bidirectional topology, so that feedback testing can be realized, and energy consumed by testing can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of power electronics, in particular to a converter module and a converter system. Background Art

[0002] With the further development of electrification, various power electronic equipment has developed explosively, such as electric vehicles, all-electric ships, all-electric aircraft, etc. The emergence of these devices has also brought new challenges to test equipment. First of all, these devices have a wide range of specifications, including voltage specifications such as 400V, 800V, 1500V, and dozens of power levels. In order to adapt to these specifications, test equipment will need to be over-equipped, which will bring great cost pressure. Secondly, these devices generally have higher testing requirements, such as being able to test system reliability under fast loads or rapid changes in the power grid, and the bandwidth requirements for test equipment are constantly increasing. In addition, as the power levels of these devices become larger and larger, such as 100KW, 200KW, etc., the energy consumed by testing is increasing. Utility Model Content

[0003] In view of this, the technical problem to be solved by the present invention is to provide a suitable test environment for various power electronic devices to match the power and voltage specifications of various power electronic devices. This requires the manufacture of a variety of different power converters, which will greatly increase the test cost and reduce the test efficiency and test reliability.

[0004] In order to solve the above technical problems, according to one embodiment of the utility model, a converter module is provided, wherein the converter module includes a totem pole circuit, an isolation circuit, and an output circuit connected in series, wherein the isolation circuit is connected between the totem pole circuit and the output circuit, and the first input end and the second input end of the totem pole circuit are connected to any two phase lines in a three-phase power supply, or the phase line and the neutral line of a single-phase power supply; the totem pole circuit converts an input voltage into a first DC voltage and outputs it to the isolation circuit, wherein the input voltage includes an AC line voltage between any two phase lines in the three-phase power supply, or a DC voltage between the phase line and the neutral line in the single-phase power supply; the isolation circuit converts the input first DC voltage into a second DC voltage and outputs it to the output circuit in an electrically isolated manner; the output circuit converts the second DC voltage into an output voltage provided to a load, wherein the output voltage includes an AC voltage or a DC voltage.

[0005] In a possible implementation, the totem pole circuit includes a first inductor, a first diode, a second diode, a first power switch tube, a second power switch tube, a third power switch tube, and a fourth power switch tube. The source of the first power switch tube, the drain of the second power switch tube, and the second end of the first inductor are connected to a first connection point. The source of the second power switch tube, the source of the fourth power switch tube, and the anode of the first diode are connected to the second connection point as the second output end of the totem pole circuit. The drain of the fourth power switch tube and the source of the third power switch tube are connected to the third connection point as the second input end of the totem pole circuit. The drain of the third power switch tube, the drain of the first power switch tube, and the cathode of the second diode are connected to the fourth connection point as the first output end of the totem pole circuit. The first end of the first inductor, the cathode of the first diode, and the anode of the second diode are connected to the fifth connection point as the first input end of the totem pole circuit.

[0006] In a possible implementation, the isolation circuit includes a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, an eighth power switch tube, a second inductor, a third inductor, a first capacitor, a second capacitor, and a first isolation transformer; the drain of the fifth power switch tube is connected to the first output end of the totem pole circuit as the first input end of the isolation circuit, the source of the fifth power switch tube is connected to the drain of the sixth power switch tube, and the source of the sixth power switch tube is connected to the second output end of the totem pole circuit as the second input end of the isolation circuit; the second inductor, the primary winding of the first isolation transformer, and the first capacitor are connected in series between the drain and the source of the sixth power switch tube, and the third inductor, the secondary winding of the first isolation transformer, and the second capacitor are connected in series between the drain and the source of the eighth power switch tube; the drain of the seventh power switch tube is connected to the first input end of the output circuit as the first output end of the isolation circuit, the source of the seventh power switch tube is connected to the drain of the eighth power switch tube, and the source of the eighth power switch tube is connected to the second input end of the output circuit as the second output end of the isolation circuit.

[0007] In a possible implementation, the output circuit includes a ninth power switch tube, a tenth power switch tube, an eleventh power switch tube, a twelfth power switch tube, and a fourth inductor.

[0008] The source of the ninth power switch tube, the drain of the tenth power switch tube, and the first end of the fourth inductor are connected to the sixth connection point, the second end of the fourth inductor is the first output end of the output circuit, the source of the tenth power switch tube and the source of the twelfth power switch tube are connected to the seventh connection point as the second input end of the output circuit, the drain of the twelfth power switch tube and the source of the eleventh power switch tube are connected to the eighth connection point as the second output end of the output circuit, and the drain of the eleventh power switch tube and the drain of the ninth power switch tube are connected to the ninth connection point as the first input end of the output circuit.

[0009] In a possible implementation, the converter module further includes a third capacitor and a fourth capacitor, the third capacitor being connected in parallel between the first output end and the second output end of the totem pole circuit; the fourth capacitor being connected in parallel between the first output end and the second output end of the isolation circuit.

[0010] In a possible implementation, the isolation circuit includes a thirteenth power switch tube, a fourteenth power switch tube, a fifteenth power switch tube, a sixteenth power switch tube, a seventeenth power switch tube, an eighteenth power switch tube, a nineteenth power switch tube, a twentieth power switch tube, a fifth inductor, a sixth inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, and a second isolation transformer; the source of the thirteenth power switch tube and the drain of the fourteenth power switch tube are connected to a tenth connection point, the source of the fourteenth power switch tube and the source of the sixteenth power switch tube are connected to an eleventh connection point, the drain of the sixteenth power switch tube and the source of the fifteenth power switch tube are connected to a twelfth connection point, the drain of the fifteenth power switch tube and the drain of the thirteenth power switch tube are connected to a thirteenth connection point; the fifth inductor and the second isolation transformer are connected to the twelfth connection point. The primary winding and the fifth capacitor are connected in series between the tenth connection point and the twelfth connection point, and the sixth capacitor is connected between the eleventh connection point and the thirteenth connection point; the source of the seventeenth power switch tube and the drain of the eighteenth power switch tube are connected to the fourteenth connection point, the source of the eighteenth power switch tube and the source of the twentieth power switch tube are connected to the fifteenth connection point, the drain of the twentieth power switch tube and the source of the nineteenth power switch tube are connected to the sixteenth connection point, and the drain of the nineteenth power switch tube and the drain of the seventeenth power switch tube are connected to the seventeenth connection point; the sixth inductor, the secondary winding of the second isolation transformer, and the seventh capacitor are connected in series between the fourteenth connection point and the sixteenth connection point, and the eighth capacitor is connected between the fifteenth connection point and the seventeenth connection point.

[0011] In a possible implementation, the output circuit includes a twenty-first power switch tube, a twenty-second power switch tube, a seventh inductor, and a ninth capacitor. The source of the twenty-first power switch tube, the drain of the twenty-second power switch tube, and the first end of the seventh inductor are connected to an eighteenth connection point. The source of the twenty-second power switch tube is connected in series with the ninth capacitor and then connected to the drain of the twenty-first power switch tube. The first end of the ninth capacitor is the first input end of the output circuit, the second end of the ninth capacitor is the second input end of the output circuit, the second end of the seventh inductor is the first output end of the output circuit, and the source of the twenty-second power switch tube is the second output end of the output circuit.

[0012] In one possible implementation, in the case of load power feedback, the output circuit feeds back the load power to the isolation circuit; the isolation circuit realizes the bidirectional flow of power between the first DC voltage and the second DC voltage in an electrically isolated manner; the totem pole circuit feeds back the power fed back by the isolation circuit to a three-phase power supply or a single-phase power supply, or provides power input for the isolation circuit of the subsequent stage.

[0013] According to another embodiment of the utility model, a converter system is provided, which includes a plurality of converter modules as described above, wherein the first input terminal and the second input terminal of the totem pole circuit in each converter module are connected to any two phase lines of a three-phase power supply, or the phase line and the neutral line of a single-phase power supply, and the output circuit in each converter module is connected in parallel and / or in series with the output circuits in any other one or more converter modules to provide voltages of various powers to the load.

[0014] According to another embodiment of the present invention, a chip is provided. The chip includes the converter module as described above.

[0015] The converter module of the embodiment of the utility model includes a three-level structure consisting of a totem pole circuit, an isolation circuit, and an output circuit. The converter module can be applied to a single-phase power supply or a three-phase power supply, and its output circuit can be connected in series or in parallel to achieve a variety of power or voltage specifications, and has good scalability. A converter module can achieve full coverage testing of production, greatly improving the reliability and cost-effectiveness of equipment testing. In addition, the three-level structure of the converter module is a bidirectional topology, which can realize feedback testing, which is conducive to reducing the energy consumed by testing.

[0016] Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 A structural block diagram of a converter module according to an embodiment of the present utility model is shown.

[0019] Figure 2 A circuit diagram of a converter module according to an embodiment of the present utility model is shown.

[0020] Figure 3 A schematic diagram showing another isolation circuit according to an embodiment of the utility model is shown.

[0021] Figure 4 A schematic diagram showing another output circuit according to an embodiment of the utility model is shown.

[0022] Figure 5 A schematic diagram of a converter system according to an embodiment of the present utility model is shown.

[0023] Figure 6 A schematic diagram of another converter system according to an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0024] Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0025] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0026] In addition, in order to better illustrate the utility model, numerous specific details are given in the specific embodiments below. It should be understood by those skilled in the art that the utility model can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the utility model.

[0027] In the related art, power converters are mainly based on modular linear amplification methods to achieve high-quality testing of power electronic equipment. Although this method can obtain a very high-quality testing environment, it consumes a lot of energy, is large in size, and is extremely expensive. There are also manufacturers that produce some power converters based on switching methods, but they are all aimed at certain specific testing environments and do not have a certain degree of versatility. Secondly, current tests generally do not have a feedback function, and even if they have a feedback function, the price is high. These power converters cannot provide a relatively wide range of testing functions. For example: first as a load test, then a battery simulation, then a power grid simulation, and so on. Therefore, there is an urgent need for a unified testing framework to achieve integration of subdivided fields, a converter module to meet the testing needs of multiple fields, to achieve large-scale mass production, and to reduce costs and increase efficiency.

[0028] In view of this, the utility model provides a converter module. Figure 1 FIG. 2 shows a structural block diagram of a converter module according to an embodiment of the present utility model. Figure 1 As shown, the converter module includes a totem pole circuit 1 , an isolation circuit 2 , and an output circuit 3 connected in series, and the isolation circuit 2 is connected between the totem pole circuit 1 and the output circuit 3 .

[0029] Among them, the converter module composed of the totem pole circuit 1, the isolation circuit 2, and the output circuit 3 can be packaged into one chip; or the totem pole circuit 1, the isolation circuit 2, and the output circuit 3 can be packaged into chips separately, and the utility model does not limit this.

[0030] In the example, the totem pole circuit 1 is used to improve the power factor of the power supply, enhance the surge resistance of the converter module, and improve the reliability of the converter module. The totem pole circuit 1 can be a single-phase bridgeless totem pole circuit, or a circuit obtained by deforming the structure of a single-phase bridgeless totem pole circuit, for example, a totem pole circuit 1 obtained by connecting a single-phase bridgeless totem pole circuit in parallel with a capacitor. The embodiment of the utility model does not limit the specific structure of the totem pole circuit 1.

[0031] In the example, the isolation circuit 2 is used to isolate the input signal from the output signal to prevent the input terminal from being damaged due to a fault at the output terminal, or the output terminal from being damaged due to a fault at the input terminal, thereby protecting the circuit safety of the converter module. In addition, by setting the isolation circuit 2, signal interference is effectively reduced, and the signal transmission quality and stability are improved. Among them, the isolation circuit 2 can be a resonant circuit of an isolated DC / DC, such as a CLLC resonant circuit, a dual active bridge circuit (DAB), etc. The embodiment of the utility model does not limit the specific structure of the isolation circuit 2.

[0032] In the example, the output circuit 3 is used to be connected in series or in parallel to provide a variety of power or voltage specifications to cope with different test fields. The output circuit 3 can be a full-bridge structure circuit or a half-bridge structure circuit, which is not limited in the embodiment of the utility model.

[0033] In a possible implementation, the first input terminal AC1 and the second input terminal AC2 of the totem pole circuit 1 are connected to any two phase lines of a three-phase power supply, or a phase line and a neutral line of a single-phase power supply;

[0034] For example, assuming that the power grid connected to the converter module is a DC power supply, whose wires are composed of a phase line (live wire) and a neutral line, the first input terminal AC1 of the totem pole circuit 1 can be connected to the phase line in the single-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 can be connected to the neutral line in the single-phase power supply.

[0035] Assume that the power grid connected to the converter module is a three-phase AC power source, which is composed of three AC potentials with the same frequency, equal amplitude, and phase difference of 120°, and may include three phase lines (VA, VB, VC lines), a neutral line (N line), and a ground line (PE line). The first input terminal AC1 and the second input terminal AC2 of the totem pole circuit 1 can be connected to any two phase lines of the phase line VA, the phase line VB, and the phase line VC in the three-phase power source.

[0036] For example, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VA in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VB in the three-phase power supply. Alternatively, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VA in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VC in the three-phase power supply. Alternatively, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VA in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VC in the three-phase power supply. Alternatively, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VB in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VA in the three-phase power supply. Alternatively, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VC in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VA in the three-phase power supply. Alternatively, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VC in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VA in the three-phase power supply. Alternatively, the first input terminal AC1 of the totem pole circuit 1 is connected to the phase line VC in the three-phase power supply, and the second input terminal AC2 of the totem pole circuit 1 is connected to the phase line VB in the three-phase power supply.

[0037] It can be seen that the first stage of the converter module of the utility model adopts a totem pole circuit 1, which can be applied to a single-phase power supply or a three-phase power supply, thereby improving applicability. Moreover, for high-power equipment to be tested, the first stage can be set to three single-phase totem pole circuits 1, using a delta connection method to enhance surge resistance and improve reliability.

[0038] Furthermore, the converter module of the present invention is a bidirectional topology, the primary totem pole circuit 1, the intermediate isolation circuit 2, and the output circuit 3 of the output stage are all bidirectional, and the converter module can implement feedback testing, further expanding the test range.

[0039] When the converter module supplies power to the load 4, the totem pole circuit 1 converts the input voltage into a first DC voltage and outputs it to the isolation circuit 2. The input voltage includes the AC line voltage between any two phases in the three-phase power supply, or the DC voltage between the phase line and the neutral line in the single-phase power supply. The isolation circuit 2 converts the input first DC voltage into a second DC voltage and outputs it to the output circuit 3 in an electrically isolated manner. The output circuit 3 converts the second DC voltage into an output voltage provided to the load 4. The output voltage includes an AC voltage or a DC voltage.

[0040] In the case of power feedback of the load 4, the output circuit 3 feeds back the power of the load 4 to the isolation circuit 2; the isolation circuit 2 realizes the bidirectional flow of power between the first DC voltage and the second DC voltage in an electrically isolated manner; the totem pole circuit 1 feeds back the power fed back by the isolation circuit 2 to a three-phase power supply or a single-phase power supply, or provides power input for the isolation circuit 2 of the subsequent stage.

[0041] In the example, a main control component can be set for the converter module, and the output end of the main control component can be connected to the control end of the converter module, such as the gate of the power switch tube included in the converter module, to control the working mode of the converter module, whether it is a power supply test of load 4 or a feedback voltage test of load 4.

[0042] The main control component can be implemented by a dedicated hardware circuit, or by general processing hardware (such as a CPU, a single-chip microcomputer, a field programmable logic device FPGA, etc.) combined with executable logic instructions to execute the working process of the main control component. The utility model does not limit the specific implementation method of the main control component.

[0043] For example, assuming that the power grid connected to the converter module is a three-phase AC power supply, and the load 4 is an AC power electronic device, the first input terminal AC1 and the second input terminal AC2 of the totem pole circuit 1 can be connected to any two phases of the three-phase power supply, and the output circuit 3 can adopt a full-bridge structure to provide AC voltage for the load 4. The working mode of the converter module can be controlled by the main control component. When the converter module supplies power to the load 4, the electric energy flows to the load 4 through the converter module, the primary totem pole circuit 1 is an AC-DC rectifier circuit, the intermediate isolation circuit 2 is a DC-DC conversion circuit, and the output circuit 3 of the output stage is a DC-AC inverter circuit; when the load 4 feeds back voltage, the electric energy flows back to the power grid from the load 4 through the converter module, the output circuit 3 of the output stage is an AC-DC rectifier circuit, the intermediate isolation circuit 2 is a DC-DC conversion circuit, and the primary totem pole circuit 1 is a DC-AC inverter circuit.

[0044] It should be noted that although Figure 1 The converter module is introduced as an example above, but those skilled in the art will appreciate that the present invention should not be limited thereto. Figure 1 The converter module shown has a structure that is deformed according to actual application scenarios.

[0045] The converter module of the above embodiment of the utility model is a modular circuit with a three-level structure consisting of a totem pole circuit 1, an isolation circuit 2, and an output circuit 3, which can be applied to a single-phase power supply or a three-phase power supply, and its output circuit 3 can be connected in series or in parallel to achieve a variety of power or voltage specifications, and has good scalability. A converter module can achieve full coverage testing of production, greatly improving the reliability and cost-effectiveness of equipment testing. In addition, the three-level structure of the converter module is a bidirectional topology, which can realize feedback testing, which is conducive to reducing the energy consumed by testing.

[0046] Figure 2 A schematic diagram of a converter module according to an embodiment of the present invention is shown below. Figure 2 Take the converter module of the present invention as an example to explain it in detail.

[0047] In one possible implementation, Figure 2As shown, the totem pole circuit 1 includes a first inductor L1, a first diode D1, a second diode D2, a first power switch tube Q1, a second power switch tube Q2, a third power switch tube Q3, and a fourth power switch tube Q4. The source of the first power switch tube Q1, the drain of the second power switch tube Q2, and the second end of the first inductor L1 are connected to a first connection point P1, and the source of the second power switch tube Q2, the source of the fourth power switch tube Q4, and the anode of the first diode D1 are connected to a second connection point P2 as a second output end of the totem pole circuit 1. The drain of the fourth power switch tube Q4 and the source of the third power switch tube Q3 are connected to the third connection point P3 as the second input terminal AC2 of the totem pole circuit 1, the drain of the third power switch tube Q3, the drain of the first power switch tube Q1, and the cathode of the second diode D2 are connected to the fourth connection point P4 as the first output terminal of the totem pole circuit 1, and the first end of the first inductor L1, the cathode of the first diode D1, and the anode of the second diode D2 are connected to the fifth connection point P5 as the first input terminal AC1 of the totem pole circuit 1.

[0048] In the totem pole circuit 1, the first inductor L1 is used as an energy storage element, the first power switch tube Q1 and the second power switch tube Q2 connected to the first inductor L1 can work as slow tubes, the third power switch tube Q3 and the fourth power switch tube Q4 can work as fast tubes, and the switching frequency of the first power switch tube Q1 and the second power switch tube Q2 is lower than the switching frequency of the third power switch tube Q3 and the fourth power switch tube Q4. A main control component can be provided, and the output end of the main control component can be connected to the gates of the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, and the fourth power switch tube Q4, so as to control the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, and the fourth power switch tube Q4 to be switched on or off alternately.

[0049] For example, when the first power switch tube Q1 is turned on and the second power switch tube Q2 is turned off, if the third power switch tube Q3 is turned on and the fourth power switch tube Q4 is turned off, the first inductor L1 is charged; if the third power switch tube Q3 is turned off and the fourth power switch tube Q4 is turned on, the first inductor L1 is discharged.

[0050] When the first power switch tube Q2 is turned on and the second power switch tube Q1 is turned off, if the third power switch tube Q3 is turned on and the fourth power switch tube Q4 is turned off, the first inductor L1 is discharged; if the third power switch tube Q3 is turned off and the fourth power switch tube Q4 is turned on, the first inductor L1 is charged.

[0051] Among them, the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, and the fourth power switch tube Q4 can play the role of switches in the circuit, and can be NPN power switch tubes or PNP power switch tubes, and the embodiments of the utility model are not limited to this.

[0052] The first diode D1 and the second diode D2 can protect the circuit, for example, to prevent the first inductor L1 from generating a reverse current due to its self-inductance, thereby affecting the circuit or damaging the device.

[0053] The totem pole circuit 1 of the utility model can not only realize the grid-connected inverter function of forward charging and reverse discharging, but also can adjust the amplitude and phase of the input current by controlling the duty cycle of each power switch tube, control the quality of the grid-side current to reduce the probability of harmonic pollution, and provide a relatively stable DC voltage for the subsequent circuit. In addition, the totem pole circuit 1 of the utility model adopts a triangle connection method, which further enhances the surge resistance of the converter module.

[0054] In one possible implementation, Figure 2 As shown, the isolation circuit 2 includes a fifth power switch tube Q5, a sixth power switch tube Q6, a seventh power switch tube Q7, an eighth power switch tube Q8, a second inductor L2, a third inductor L3, a first capacitor C1, a second capacitor C2, and a first isolation transformer T1. The drain of the fifth power switch tube Q5 is connected to the first output end of the totem pole circuit 1 as the first input end of the isolation circuit 2, the source of the fifth power switch tube Q5 is connected to the drain of the sixth power switch tube Q6, and the source of the sixth power switch tube Q6 is connected to the second output end of the totem pole circuit 1 as the second input end of the isolation circuit 2; the second inductor L2, the first The primary winding of the isolation transformer T1 and the first capacitor C1 are connected in series between the drain and source of the sixth power switch tube Q6, and the third inductor L3, the secondary winding of the first isolation transformer T1, and the second capacitor C2 are connected in series between the drain and source of the eighth power switch tube Q8; the drain of the seventh power switch tube Q7 is connected to the first input end of the output circuit 3 as the first output end of the isolation circuit 2, the source of the seventh power switch tube Q7 is connected to the drain of the eighth power switch tube Q8, and the source of the eighth power switch tube Q8 is connected to the second input end of the output circuit 3 as the second output end of the isolation circuit 2.

[0055] like Figure 2As shown, the isolation circuit 2 can be a CLLC resonant circuit, which is a bidirectional DC-DC topology based on the resonance principle. The topology is composed of four power switch tubes (for example, the fifth power switch tube Q5 to the eighth power switch tube Q8), two inductors (for example, the second inductor L2, the third inductor L3) and two capacitors (the first capacitor C1, the second capacitor C2), wherein the inductor and the capacitor form a resonant circuit. When the power switch tube is closed or opened, a resonant waveform will be generated in the resonant circuit, thereby realizing the conversion of the input voltage.

[0056] Among them, a main control component can be set, and the output end of the main control component can be connected to the gate of the fifth power switch tube Q5 to the eighth power switch tube Q8 to control the fifth power switch tube Q5 to the eighth power switch tube Q8 to be turned on or off to generate a resonant waveform.

[0057] In such Figure 2 In the isolation circuit 2 shown, soft switching is achieved through the resonance process of the resonant inductor and capacitor, and bidirectional buck-boost operation is realized, which has the advantages of low cost, high reliability, and good anti-interference performance.

[0058] In one possible implementation, Figure 3 A schematic diagram of another isolation circuit 2 according to an embodiment of the present utility model is shown. Figure 3 As shown, the isolation circuit 2 includes a thirteenth power switch tube Q13, a fourteenth power switch tube Q14, a fifteenth power switch tube Q15, a sixteenth power switch tube Q16, a seventeenth power switch tube Q17, an eighteenth power switch tube Q18, a nineteenth power switch tube Q19, a twentieth power switch tube Q20, a fifth inductor L5, a sixth inductor L6, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a second isolation transformer T2.

[0059] The source of the thirteenth power switch tube Q13 and the drain of the fourteenth power switch tube Q14 are connected to the tenth connection point P10, the source of the fourteenth power switch tube Q14 and the source of the sixteenth power switch tube Q15 are connected to the eleventh connection point P11, the drain of the sixteenth power switch tube Q16 and the source of the fifteenth power switch tube Q15 are connected to the twelfth connection point P12, and the drain of the fifteenth power switch tube Q15 and the drain of the thirteenth power switch tube Q13 are connected to the thirteenth connection point P13; the fifth inductor L5, the primary winding of the second isolation transformer T2, and the fifth capacitor C5 are connected in series between the tenth connection point P10 and the twelfth connection point P12, and the sixth capacitor C6 is connected between the eleventh connection point P11 and the thirteenth connection point P13;

[0060] The source of the seventeenth power switch tube Q17 and the drain of the eighteenth power switch tube Q18 are connected to the fourteenth connection point P14, the source of the eighteenth power switch tube Q18 and the source of the twentieth power switch tube Q20 are connected to the fifteenth connection point P15, the drain of the twentieth power switch tube Q20 and the source of the nineteenth power switch tube Q19 are connected to the sixteenth connection point P16, the drain of the nineteenth power switch tube Q19 and the drain of the seventeenth power switch tube Q17 are connected to the seventeenth connection point P17; the sixth inductor L6, the secondary winding of the second isolation transformer T2, and the seventh capacitor C7 are connected in series between the fourteenth connection point P14 and the sixteenth connection point P16, and the eighth capacitor C8 is connected between the fifteenth connection point P15 and the seventeenth connection point P17.

[0061] contrast Figure 2 The isolation circuit 2 in the Figure 3 The isolation circuit shown adds two active bridges, for example, the primary side of the second isolation transformer T2 is composed of an active bridge consisting of a thirteenth power switch tube Q13, a fourteenth power switch tube Q14, a fifteenth power switch tube Q15, and a sixteenth power switch tube Q16, and the secondary side of the second isolation transformer T2 is composed of an active bridge consisting of a seventeenth power switch tube Q17, an eighteenth power switch tube Q18, a nineteenth power switch tube Q19, and a twentieth power switch tube Q20.

[0062] Among them, a main control component can be set, and the output end of the main control component can be connected to the gate of the thirteenth power switch tube Q13 to the nineteenth power switch tube Q19, which is used to control the thirteenth power switch tube Q13 to the nineteenth power switch tube Q19 to turn on or off, and generate a resonant waveform. In actual applications, the control method adopted by the main control component may include: single phase shift control method (Singe Phase Shift, SPS), dual phase shift control method (Dual Phase Shift, DPS), three-phase control method (Triple Phase Shift, TPS), two-stage control method, voltage balance control method, etc., and the utility model does not limit this.

[0063] The isolation circuit 2 is set as a dual active bridge converter, each active bridge has voltage output and current output capabilities, can realize bidirectional transmission of voltage and current, and realize high-efficiency, high-power density power conversion.

[0064] In a possible implementation, the output circuit 3 includes a ninth power switch tube Q9, a tenth power switch tube Q10, an eleventh power switch tube Q11, a twelfth power switch tube Q12, and a fourth inductor L4. The source of the ninth power switch tube Q9, the drain of the tenth power switch tube Q10, and the first end of the fourth inductor L4 are connected to a sixth connection point P6. The second end of the fourth inductor L4 is the first output end OUT1 of the output circuit 3. The source of the tenth power switch tube Q10 and the source of the twelfth power switch tube Q12 are connected to a seventh connection point P7 as the second input end of the output circuit 3. The drain of the twelfth power switch tube Q12 and the source of the eleventh power switch tube Q11 are connected to an eighth connection point P8 as the second output end OUT2 of the output circuit 3. The drain of the eleventh power switch tube Q11 and the drain of the ninth power switch tube Q9 are connected to a ninth connection point P9 as the first input end of the output circuit 3.

[0065] In the example, the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11, and the twelfth power switch tube Q12 form a full-bridge structure, and a main control component can be set. The output end of the main control component can be connected to the gates of the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11, and the twelfth power switch tube Q12, and is used to control the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11, and the twelfth power switch tube Q12 to be turned on or off, thereby realizing bidirectional control of the output current 4.

[0066] For example, by controlling the ninth power switch tube Q9 to be turned on, the tenth power switch tube Q10 to be turned off, the eleventh power switch tube Q11 to be turned off, and the twelfth power switch tube Q12 to be turned on, the output voltage between the first output terminal OUT1 and the second output terminal OUT2 of the output circuit 3 is positive.

[0067] By controlling the ninth power switch tube Q9 to turn off, the tenth power switch tube Q10 to turn on, the eleventh power switch tube Q11 to turn on, and the twelfth power switch tube Q12 to turn off, the output voltage between the first output terminal OUT1 and the second output terminal OUT2 of the output circuit 3 is negative.

[0068] By controlling the ninth power switch tube Q9 , the tenth power switch tube Q10 , the eleventh power switch tube Q11 , and the twelfth power switch tube Q12 to be turned on or off, an AC or DC output voltage can be provided for the load 4 .

[0069] For another example, during the feedback test of the load 4, the fourth inductor L4 is used as an energy storage element, the ninth power switch tube Q9 and the tenth power switch tube Q10 connected to the fourth inductor L4 can work as slow tubes, the eleventh power switch tube Q11 and the twelfth power switch tube Q12 can work as fast tubes, and the switching frequency of the ninth power switch tube Q9 and the tenth power switch tube Q10 is less than the switching frequency of the eleventh power switch tube Q11 and the twelfth power switch tube Q12. Among them, a main control component can be set, and the output end of the main control component can be connected to the gates of the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11, and the twelfth power switch tube Q12, for controlling the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11, and the twelfth power switch tube Q12 to be staggered on or off. For details, please refer to the full-bridge structure in the totem pole circuit 1, which will not be repeated here.

[0070] By setting the output circuit 3 to a full-bridge structure, the input and output of the output circuit 3 of the bidirectional topology can be either AC or DC, which is more flexible and can be applied in a wider range of scenarios.

[0071] In one possible implementation, Figure 4 A schematic diagram of another output circuit 3 according to an embodiment of the present utility model is shown. Figure 4 As shown, the output circuit 3 includes a twenty-first power switch tube Q21, a twenty-second power switch tube Q22, a seventh inductor L7, and a ninth capacitor C9. The source of the twenty-first power switch tube Q21, the drain of the twenty-second power switch tube Q22, and the first end of the seventh inductor L7 are connected to the eighteenth connection point P18. The source of the twenty-second power switch tube Q22 is connected in series with the ninth capacitor C9 and then connected to the drain of the twenty-first power switch tube Q21. The first end of the ninth capacitor C9 is the first input end of the output circuit 3, the second end of the ninth capacitor C9 is the second input end of the output circuit 3, the second end of the seventh inductor L7 is the first output end OUT1 of the output circuit 3, and the source of the twenty-second power switch tube Q22 is the second output end OUT2 of the output circuit 3.

[0072] In the example, the twenty-first power switch tube Q21 and the twenty-second power switch tube Q22 form a half-bridge structure, and a main control component can be set. The output end of the main control component can be connected to the gate of the twenty-first power switch tube Q21 and the twenty-second power switch tube Q22 to control the twenty-first power switch tube Q21 and the twenty-second power switch tube Q22 to be turned on or off, thereby realizing bidirectional control of the output current 4.

[0073] For example, if the twenty-first power switch tube Q21 is turned off and the twenty-second power switch tube Q22 is turned on, the seventh inductor L7 is charged, and the electric energy fed back by the load 4 can be stored.

[0074] For another example, if the twenty-first power switch tube Q21 is turned on and the twenty-second power switch tube Q22 is turned off, the seventh inductor L7 is discharged, and can provide electrical energy for the load 4 or the ninth capacitor C9.

[0075] The output circuit 3 of the utility model adopts a half-bridge structure, and the circuit is simple. The electric energy provided by the output circuit 3 to the load 4, or the electric energy fed back by the load 4 is direct current.

[0076] In one possible implementation, Figure 2 As shown, the converter module further includes a third capacitor C3 and a fourth capacitor C4, wherein the third capacitor C3 is connected in parallel between the first output end and the second output end of the totem pole circuit 1; and the fourth capacitor C4 is connected in parallel between the first output end and the second output end of the isolation circuit 2.

[0077] By setting the third capacitor C3 and the fourth capacitor C4, not only can they be used to filter noise and interference in the circuit, but they can also be used to compensate for the reactive power of the inductive load of the power system to increase the power factor, improve the voltage quality and reduce line loss.

[0078] According to another embodiment of the present invention, a converter system is provided, wherein the converter system comprises a plurality of Figure 1 In the converter module shown, the first input terminal AC1 and the second input terminal AC2 of the totem pole circuit 1 in each converter module are connected to any two phase lines in a three-phase power supply, or the phase line and the neutral line of a single-phase power supply, and the output circuit 3 in each converter module is connected in parallel and / or in series with the output circuit 3 in any other one or more converter modules to provide voltages of various powers to the load 4.

[0079] Figure 5 A schematic diagram of a converter system according to an embodiment of the present utility model is shown as follows: Figure 5 As shown, the converter system includes three converter modules whose outputs are connected in series, for example: converter module 51 , converter module 52 , and converter module 53 .

[0080] The first input terminal AC1 of the converter module 51 is connected to the phase line VA of the three-phase power supply, and the second input terminal AC2 of the converter module 51 is connected to the phase line VB of the three-phase power supply; the first input terminal AC1 of the converter module 52 is connected to the phase line VB of the three-phase power supply, and the second input terminal AC2 of the converter module 52 is connected to the phase line VC of the three-phase power supply; the first input terminal AC1 of the converter module 53 is connected to the phase line VC of the three-phase power supply, and the second input terminal AC2 of the converter module 53 is connected to the phase line VA of the three-phase power supply.

[0081] The second output terminal OUT2 of the converter module 51 is connected to the first output terminal OUT1 of the converter module 52, and the second output terminal OUT2 of the converter module 52 is connected to the first output terminal OUT1 of the converter module 53. The voltage between the first output terminal OUT1 of the converter module 51 and the second output terminal OUT2 of the converter module 53 is used as the output voltage ( Figure 5 The power supply at both ends of the capacitor C10). The capacitor C10 is used as a filter circuit and may or may not be added, and the present invention does not impose any limitation on this.

[0082] In this way, by connecting the outputs of multiple converter modules in series, the range of the output voltage can be greatly increased. The more converter modules are connected in series, the greater the range of the output voltage.

[0083] Figure 6 A schematic diagram of another converter system according to an embodiment of the present utility model is shown as follows: Figure 6 As shown, the converter system includes six converter modules, for example, converter module 61, converter module 62, converter module 63, converter module 64, converter module 65, and converter module 66. The outputs of converter module 61, converter module 62, and converter module 63 are connected in series to form a first circuit, the outputs of converter module 64, converter module 65, and converter module 66 are connected in series to form a second circuit, and the outputs of the first circuit and the second circuit are connected in parallel to form a converter system.

[0084] The first input terminal AC1 of the converter module 61 is connected to the phase line VA of the three-phase power supply, and the second input terminal AC2 of the converter module 61 is connected to the phase line VB of the three-phase power supply; the first input terminal AC1 of the converter module 62 is connected to the phase line VB of the three-phase power supply, and the second input terminal AC2 of the converter module 62 is connected to the phase line VC of the three-phase power supply; the first input terminal AC1 of the converter module 63 is connected to the phase line VC of the three-phase power supply, and the second input terminal AC2 of the converter module 63 is connected to the phase line VA of the three-phase power supply.

[0085] The first input terminal AC1 of the converter module 64 is connected to the phase line VA of the three-phase power supply, and the second input terminal AC2 of the converter module 64 is connected to the phase line VB of the three-phase power supply; the first input terminal AC1 of the converter module 65 is connected to the phase line VB of the three-phase power supply, and the second input terminal AC2 of the converter module 65 is connected to the phase line VC of the three-phase power supply; the first input terminal AC1 of the converter module 66 is connected to the phase line VC of the three-phase power supply, and the second input terminal AC2 of the converter module 66 is connected to the phase line VA of the three-phase power supply.

[0086] The second output terminal OUT2 of the converter module 61 is connected to the first output terminal OUT1 of the converter module 62, the second output terminal OUT2 of the converter module 62 is connected to the first output terminal OUT1 of the converter module 63, and the voltage between the first output terminal OUT1 of the converter module 61 and the second output terminal OUT2 of the converter module 63 serves as the output voltage of the first circuit.

[0087] The second output terminal OUT2 of the converter module 64 is connected to the first output terminal OUT1 of the converter module 65, the second output terminal OUT2 of the converter module 65 is connected to the first output terminal OUT1 of the converter module 66, and the voltage between the first output terminal OUT1 of the converter module 64 and the second output terminal OUT2 of the converter module 66 serves as the output voltage of the second circuit.

[0088] The first output terminal OUT1 of the converter module 61 is connected to the first output terminal OUT1 of the converter module 64 at the connection point P19, and the second output terminal OUT2 of the converter module 63 is connected to the second output terminal OUT2 of the converter module 66 at the connection point P20. The voltage between the connection point P19 and the connection point P20 is used as the output voltage of the converter system ( Figure 6 The voltage across the capacitor C11 is measured). The capacitor C11 is used as a filter circuit and may or may not be added, and the present invention does not impose any limitation on this.

[0089] In this way, by connecting the outputs of multiple converter modules in series, the range of output voltage can be greatly increased, and by connecting the outputs of multiple converter modules in parallel, the output current can be greatly increased. The more converter modules are connected in series, the larger the range of output voltage; the more converter modules are connected in parallel, the larger the output current.

[0090] It should be noted that although Figure 5 and Figure 6 The converter system is introduced as an example, but those skilled in the art will appreciate that the present invention should not be limited thereto. In fact, the converter system may include multiple converter modules, and the present invention does not limit the number of converter modules included in the converter system, or the series or parallel relationship of the outputs of the multiple converter modules.

[0091] In a possible implementation, the utility model provides a chip, wherein the chip includes the converter module described above.

[0092] In a possible implementation, the utility model provides an electronic device, wherein the electronic device includes the converter module as described above.

[0093] In a possible implementation, the utility model provides a board card, wherein the board card includes a plurality of converter modules, and outputs of the converter modules are connected in series and / or in parallel.

[0094] In summary, the converter module of the utility model can be used in a mixed manner for single-phase and three-phase, with source and load integrated, and has extremely strong elasticity, excellent isolation capability, and excellent scalability of power and voltage range. The converter module is a bidirectional topology with a three-stage structure, and the front stage is a bridgeless totem pole circuit 1, which can achieve relatively high efficiency while taking into account reliability, and can be used for single-phase and three-phase. The middle stage is an isolation circuit 2 (such as a CLLC resonant circuit or a dual active bridge conversion circuit), which is implemented based on a soft switching method and has a relatively good power density. The output circuit 3 of the output stage is a full-bridge or half-bridge structure. The advantage of this converter module is that single-phase and three-phase can be used, and the output can be connected in series or in parallel to achieve a variety of power or voltage specification levels to cope with different test fields.

[0095] In actual applications, since the converter module has strong scalability, the outputs of multiple converter modules can be connected in series or in parallel to form a converter system, combining various power and voltage specifications. Among them, since the converter module is a bidirectional topology, the converter system composed of multiple converter modules is also bidirectional, which can realize the feedback test function and further expand the test range. In addition, from the application level, a converter module can achieve full coverage testing of production and large-scale mass production, with excellent reliability and cost performance.

[0096] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A converter module, characterized in that: The converter module comprises a totem pole circuit, an isolation circuit and an output circuit connected in series, wherein the isolation circuit is connected between the totem pole circuit and the output circuit, and the first input end and the second input end of the totem pole circuit are connected to any two phase lines of a three-phase power supply, or the phase line and the neutral line of a single-phase power supply; The totem pole circuit converts an input voltage into a first DC voltage and outputs it to the isolation circuit, wherein the input voltage includes an AC line voltage between any two phase lines in the three-phase power supply, or a DC voltage between a phase line and a neutral line in the single-phase power supply; The isolation circuit converts the input first DC voltage into a second DC voltage and outputs it to the output circuit in an electrically isolated manner; The output circuit converts the second DC voltage into an output voltage provided to a load, wherein the output voltage includes an AC voltage or a DC voltage.

2. The converter module according to claim 1, characterized in that: The totem pole circuit includes a first inductor, a first diode, a second diode, a first power switch tube, a second power switch tube, a third power switch tube, and a fourth power switch tube. The source of the first power switch tube, the drain of the second power switch tube, and the second end of the first inductor are connected to the first connection point, the source of the second power switch tube, the source of the fourth power switch tube, and the anode of the first diode are connected to the second connection point as the second output end of the totem pole circuit, the drain of the fourth power switch tube and the source of the third power switch tube are connected to the third connection point as the second input end of the totem pole circuit, the drain of the third power switch tube, the drain of the first power switch tube, and the cathode of the second diode are connected to the fourth connection point as the first output end of the totem pole circuit, and the first end of the first inductor, the cathode of the first diode, and the anode of the second diode are connected to the fifth connection point as the first input end of the totem pole circuit.

3. The converter module according to claim 1, characterized in that: The isolation circuit includes a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, an eighth power switch tube, a second inductor, a third inductor, a first capacitor, a second capacitor, and a first isolation transformer. The drain of the fifth power switch tube is connected to the first output end of the totem pole circuit as the first input end of the isolation circuit, the source of the fifth power switch tube is connected to the drain of the sixth power switch tube, and the source of the sixth power switch tube is connected to the second output end of the totem pole circuit as the second input end of the isolation circuit; The second inductor, the primary winding of the first isolation transformer, and the first capacitor are connected in series between the drain and the source of the sixth power switch tube, and the third inductor, the secondary winding of the first isolation transformer, and the second capacitor are connected in series between the drain and the source of the eighth power switch tube; The drain of the seventh power switch tube is connected to the first input end of the output circuit as the first output end of the isolation circuit, the source of the seventh power switch tube is connected to the drain of the eighth power switch tube, and the source of the eighth power switch tube is connected to the second input end of the output circuit as the second output end of the isolation circuit.

4. The converter module according to claim 1, characterized in that: The output circuit includes a ninth power switch tube, a tenth power switch tube, an eleventh power switch tube, a twelfth power switch tube, and a fourth inductor. The source of the ninth power switch tube, the drain of the tenth power switch tube, and the first end of the fourth inductor are connected to the sixth connection point, the second end of the fourth inductor is the first output end of the output circuit, the source of the tenth power switch tube and the source of the twelfth power switch tube are connected to the seventh connection point as the second input end of the output circuit, the drain of the twelfth power switch tube and the source of the eleventh power switch tube are connected to the eighth connection point as the second output end of the output circuit, and the drain of the eleventh power switch tube and the drain of the ninth power switch tube are connected to the ninth connection point as the first input end of the output circuit.

5. The converter module according to any one of claims 1 to 4, characterized in that: The converter module further includes a third capacitor and a fourth capacitor, The third capacitor is connected in parallel between the first output terminal and the second output terminal of the totem pole circuit; The fourth capacitor is connected in parallel between the first output terminal and the second output terminal of the isolation circuit.

6. The converter module according to claim 1, characterized in that: The isolation circuit includes a thirteenth power switch tube, a fourteenth power switch tube, a fifteenth power switch tube, a sixteenth power switch tube, a seventeenth power switch tube, an eighteenth power switch tube, a nineteenth power switch tube, a twentieth power switch tube, a fifth inductor, a sixth inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, and a second isolation transformer. The source of the thirteenth power switch tube and the drain of the fourteenth power switch tube are connected to the tenth connection point, the source of the fourteenth power switch tube and the source of the sixteenth power switch tube are connected to the eleventh connection point, the drain of the sixteenth power switch tube and the source of the fifteenth power switch tube are connected to the twelfth connection point, and the drain of the fifteenth power switch tube and the drain of the thirteenth power switch tube are connected to the thirteenth connection point; The fifth inductor, the primary winding of the second isolation transformer, and the fifth capacitor are connected in series between the tenth connection point and the twelfth connection point, and the sixth capacitor is connected between the eleventh connection point and the thirteenth connection point; The source of the seventeenth power switch tube and the drain of the eighteenth power switch tube are connected to the fourteenth connection point, the source of the eighteenth power switch tube and the source of the twentieth power switch tube are connected to the fifteenth connection point, the drain of the twentieth power switch tube and the source of the nineteenth power switch tube are connected to the sixteenth connection point, and the drain of the nineteenth power switch tube and the drain of the seventeenth power switch tube are connected to the seventeenth connection point; The sixth inductor, the secondary winding of the second isolation transformer, and the seventh capacitor are connected in series between the fourteenth connection point and the sixteenth connection point, and the eighth capacitor is connected between the fifteenth connection point and the seventeenth connection point.

7. The converter module according to claim 1, characterized in that: The output circuit includes a twenty-first power switch tube, a twenty-second power switch tube, a seventh inductor, and a ninth capacitor. The source of the twenty-first power switch tube, the drain of the twenty-second power switch tube, and the first end of the seventh inductor are connected to the eighteenth connection point, the source of the twenty-second power switch tube is connected in series with the ninth capacitor and then connected to the drain of the twenty-first power switch tube. Among them, the first end of the ninth capacitor is the first input end of the output circuit, the second end of the ninth capacitor is the second input end of the output circuit, the second end of the seventh inductor is the first output end of the output circuit, and the source of the twenty-second power switch tube is the second output end of the output circuit.

8. The converter module according to any one of claims 1 to 4, characterized in that: In the case of load power feedback, the output circuit feeds back the load power to the isolation circuit; The isolation circuit realizes a bidirectional flow of power between the first DC voltage and the second DC voltage in an electrically isolated manner; The totem pole circuit feeds back the power fed back by the isolation circuit to a three-phase power supply or a single-phase power supply, or provides power input for the isolation circuit at a subsequent stage.

9. A converter system, characterized in that: The converter system comprises a plurality of converter modules as claimed in any one of claims 1 to 8, wherein the first input terminal and the second input terminal of the totem pole circuit in each converter module are connected to any two phase lines of a three-phase power supply, or the phase line and the neutral line of a single-phase power supply, and the output circuit in each converter module is connected in parallel and / or in series with the output circuits in any other one or more converter modules to provide voltages of various powers to the load.

10. A chip, characterized in that: The chip comprises the converter module according to any one of claims 1 to 8.

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