Converter module and converter

Abstract

The present application provides a converter module and converter, which can construct multiple circuit topologies by setting up the basic structure of the first variable sub-circuit and the second variable sub-circuit, and connecting the first variable sub-circuit and the second variable sub-circuit through a composite busbar. Each circuit topology can adapt to the corresponding power supply network and can be applicable to multiple application scenarios.

Description

Technical Field

[0001] The present application relates to the technical field of train converters, and in particular to a water converter module and a converter. Background Art

[0002] The high-frequency auxiliary converter suitable for subway DC (Direct Current) 1500V input consists of: filter unit, chopper unit, resonant unit, inverter unit and charging unit. Figure 1 A schematic diagram of the structure of a high-frequency auxiliary converter provided in the related art is shown in FIG. Figure 1 As shown, the chopper unit utilizes a three-level chopper circuit, the high-frequency isolation unit utilizes a resonant converter circuit (LLC) series resonant circuit, the three-phase inverter unit utilizes a three-level inverter circuit, and the charger unit utilizes an isolated half-bridge DC / DC circuit. The high-frequency auxiliary converter has a wide input voltage range of DC1000V-DC1800V. This voltage is pre-regulated by the chopper unit and converted to a 1050V DC voltage. This intermediate voltage is isolated and transformed through the LLC resonant circuit, converting it to 700VDC. This voltage is then output through a three-phase inverter to 380V AC. The charger also draws power from the LLC output voltage, converting it to 110V (or 24V) DC via an isolated half-bridge DC / DC circuit. This circuit is mainly used in the 1500V power supply system of urban rail, but there are problems for the application scenarios of DC750V power supply for light rail or DC3600V power supply for train. If it is a DC3600V power supply system, the input voltage of the post-stage LLC will be as high as 2520V, and 3300V voltage-resistant power devices are required, resulting in higher device losses and expensive material costs. For the DC750V power supply system, the input voltage of the post-stage LLC is only 525V. Since the LLC soft switching time margin is positively correlated with the input voltage, it will cause higher switching losses in high-power applications, increasing the risk of device damage. In other words, the current high-frequency auxiliary converter has the problem of not being able to adapt to a wide input voltage range and can only be used in the DC1500V application scenario of the subway. Summary of the Invention

[0003] In response to the problems in the above-mentioned related technologies, the present application provides a water converter module and a converter, which can connect the first variable sub-circuit and the second variable sub-circuit through a composite busbar to construct multiple circuit topologies, which can adapt to multiple application scenarios.

[0004] The present application provides a converter module, comprising: a first variable subcircuit and a second variable subcircuit, and a composite busbar, wherein the first variable subcircuit and the second variable subcircuit have the same structure, and the first variable circuit and the second variable subcircuit include: a first chopper switch tube, a second chopper switch tube, a first chopper diode, a second chopper diode, a first chopper capacitor, a second chopper capacitor, a first resonant switch tube, a second resonant switch tube, a third resonant switch tube, a fourth resonant switch tube, and a resonant capacitor, wherein the collector of the first chopper switch tube is connected to the positive electrode of the first chopper diode, the negative electrode of the first chopper diode is connected to the positive electrode of the first chopper capacitor and the collector of the first resonant switch tube, and the emitter of the first chopper switch tube is connected to the collector of the second chopper switch tube. The emitter of the second chopper switch tube is connected to the cathode of the second chopper diode, the cathode of the second chopper capacitor is connected to the anode of the second chopper diode and the emitter of the fourth resonant switch, the emitter of the first resonant switch tube is connected to the anode of the resonant capacitor and the collector of the second resonant switch tube, and the emitter of the third resonant switch tube is connected to the collector of the fourth resonant switch tube; the collector of the first chopper switch tube of the first variable sub-circuit is used to connect the positive electrode of the power supply network, and the emitter of the second chopper switch tube of the second variable sub-circuit is connected to the negative electrode of the power supply network. The composite busbar can be used to connect the first variable sub-circuit and the second variable sub-circuit to construct multiple circuit topologies, each of which can adapt to the corresponding power supply network.

[0005] In some embodiments, the composite busbar includes a first connection structure, which is used to connect the collector of the first resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the collector of the third resonant switch tube, and to connect the emitter of the second resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the emitter of the fourth resonant switch tube, and to connect the emitter of the second chopper switch tube of the first variable circuit with the collector of the first chopper switch tube of the second variable circuit.

[0006] In some embodiments, the voltage of the power grid comprises 1500V.

[0007] In some embodiments, the composite busbar also includes: a second connection structure, which is used to connect the emitter of the second resonant switch tube in the first variable sub-circuit and the second variable sub-circuit to the negative electrode of the first chopping capacitor and the collector of the third resonant switch tube; and to connect the emitter of the second chopping switch tube in the first variable sub-circuit to the collector of the second chopping switch tube in the second variable sub-circuit.

[0008] In some embodiments, the voltage of the power supply network includes: 3600V.

[0009] In some embodiments, the composite busbar also includes: a third connection structure, which is used to connect the collector of the first resonant switch tube in the first variable subcircuit and the second variable subcircuit to the emitter of the third resonant switch tube, and connect the emitter of the second resonant switch tube in the first variable subcircuit and the second variable subcircuit to the emitter of the fourth resonant switch tube, and connect the collector of the first chopper switch in the first variable subcircuit to the collector of the first chopper unit in the second variable subcircuit, and connect the emitter of the second chopper switch tube in the first variable subcircuit to the emitter of the second chopper unit of the second chopper switch tube in the second variable subcircuit.

[0010] In some embodiments, the voltage of the power supply network includes: 750V.

[0011] In some embodiments, the rated voltage of the chopper switch tube is 1200V, and the rated voltage of the resonant switch tube is 1700V.

[0012] An embodiment of the present application provides a converter, including the converter module.

[0013] In some embodiments, the converter further includes: a heat sink, and the converter module is disposed on the heat sink.

[0014] The present application provides a converter module and converter, which can construct multiple circuit topologies by setting up the basic structure of the first variable sub-circuit and the second variable sub-circuit, and connecting the first variable sub-circuit and the second variable sub-circuit through a composite busbar. Each circuit topology can adapt to the corresponding power supply network and can be applicable to multiple application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, the present application will be described in more detail based on embodiments with reference to the accompanying drawings.

[0016] Figure 1 A schematic structural diagram of a high-frequency auxiliary converter provided in the related art;

[0017] Figure 2 A schematic structural diagram of a first variable sub-circuit and a second variable sub-circuit provided in an embodiment of the present application;

[0018] Figure 3 A schematic structural diagram of a composite busbar provided in an embodiment of the present application connecting the first variable sub-circuit and the second variable sub-circuit;

[0019] Figure 4 A schematic structural diagram of another composite busbar provided in an embodiment of the present application connecting the first variable sub-circuit and the second variable sub-circuit;

[0020] Figure 5This is a structural diagram of another composite busbar provided in an embodiment of the present application connecting the first variable sub-circuit and the second variable sub-circuit.

[0021] In the drawings, like components are given like reference numerals, and the drawings are not drawn to scale. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limiting this application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0024] If similar descriptions of "first\second\third" appear in the application documents, the following explanation will be added. In the following description, the terms "first\second\third" are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0026] Based on the problems existing in the related art, an embodiment of the present application provides a converter module, which includes: a first variable subcircuit and a second variable subcircuit, and a composite busbar, wherein the first variable subcircuit has the same structure as the second variable subcircuit, and the first variable circuit and the second variable subcircuit include: a first chopper switch tube, a second chopper switch tube, a first chopper diode, a second chopper diode, a first chopper capacitor, a second chopper capacitor, a first resonant switch tube, a second resonant switch tube, a third resonant switch tube, a fourth resonant switch tube, and a resonant capacitor, the collector of the first chopper switch tube is connected to the positive electrode of the first chopper diode, the negative electrode of the first chopper diode is connected to the positive electrode of the first chopper capacitor and the collector of the first resonant switch tube, and the emitter of the first chopper switch tube is connected to the The collector of the second chopper switch tube and the negative electrode of the first chopper capacitor, the emitter of the second chopper switch tube is connected to the negative electrode of the second chopper diode, the negative electrode of the second chopper capacitor is connected to the positive electrode of the second chopper diode and the emitter of the fourth resonant switch, the emitter of the first resonant switch tube is connected to the positive electrode of the resonant capacitor and the collector of the second resonant switch tube, and the emitter of the third resonant switch tube is connected to the collector of the fourth resonant switch tube; the collector of the first chopper switch tube of the first variable sub-circuit is used to connect to the positive electrode of the power supply network, and the emitter of the second chopper switch tube of the second variable sub-circuit is connected to the negative electrode of the power supply network. The composite busbar can be used to connect the first variable sub-circuit and the second variable sub-circuit to construct multiple circuit topologies, each of which can adapt to the corresponding power supply network.

[0027] Figure 2 The schematic diagram of the structure of the first variable sub-circuit and the second variable sub-circuit provided in the embodiment of the present application is as follows: Figure 2 As shown, in order to distinguish the first variable sub-circuit and the second variable sub-circuit, different symbols are used in the figure. The first variable circuit includes: a first chopper switch tube Qb1, a second chopper switch tube Qb2, a first chopper diode Db1, a second chopper diode Db2, a first chopper capacitor Cb1, a second chopper capacitor Cb2, a first resonant switch tube Q1, a second resonant switch tube Q2, a third resonant switch tube Q3, a fourth resonant switch tube Q4, and a resonant capacitor C s, the c-terminal of Qb1 is connected to the +-terminal of Db1, the -terminal of Db1 is connected to the +-terminal of Cb1, and is also connected to the c-terminal of Q1; the e-terminal of Qb1 is connected to the c-terminal of Qb2, and is also connected to the -terminal of Cb1; the e-terminal of Qb2 is connected to the -terminal of Db2, the -terminal of Cb2 is connected to the +-terminal of Db2, and is also connected to the e-terminal of Q4; the e-terminal of Q1 is connected to the +-terminal of Cs, the e-terminal of Q1 is connected to the c-terminal of Q2, and the e-terminal of Q3 is connected to the c-terminal of Q4; the c-terminal of Qb1 is used to connect to the positive pole of the power supply network.

[0028] The second variable circuit includes: a first chopper switch tube Qb3, a second chopper switch tube Qb4, a first chopper diode Db3, a second chopper diode Db4, a first chopper capacitor Cb3, a second chopper capacitor Cb4, a first resonant switch tube Q5, a second resonant switch tube Q5, a third resonant switch tube Q6, a fourth resonant switch tube Q7, and a resonant capacitor. The c-terminal of Qb3 is connected to the +-terminal of Db3, the -terminal of Db3 is connected to the +-terminal of Cb3, and is also connected to the c-terminal of Q5; the e-terminal of Qb3 is connected to the c-terminal of Qb4 and is also connected to the -terminal of Cb3; the e-terminal of Qb4 is connected to the -terminal of Db4, the -terminal of Cb4 is connected to the +-terminal of Db4, and is also connected to the e-terminal of Q8; the e-terminal of Q5 is connected to the +-terminal of Cs, the e-terminal of Q5 is connected to the c-terminal of Q6, and the e-terminal of Q7 is connected to the c-terminal of Q8. The c-terminal of Qb3 is used to connect to the positive pole of the power supply network.

[0029] The composite busbar can be used to connect the first variable sub-circuit and the second variable sub-circuit to construct a plurality of circuit topologies, each of which can adapt to a corresponding power supply network.

[0030] In an embodiment of the present application, the composite busbar can be used to connect the first variable sub-circuit and the second variable sub-circuit to form three circuit topologies, and the power supply network voltage corresponding to each circuit topology may include: 1500V, 3600V, and 750V.

[0031] The converter module provided in the embodiment of the present application can construct multiple circuit topologies by setting up the basic structure of the first variable sub-circuit and the second variable sub-circuit, and connecting the first variable sub-circuit and the second variable sub-circuit through a composite busbar. Each circuit topology can adapt to the corresponding power supply network and can be applicable to multiple application scenarios.

[0032] In some embodiments, the composite busbar includes a first connection structure, which is used to connect the collector of the first resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the collector of the third resonant switch tube, and to connect the emitter of the second resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the emitter of the fourth resonant switch tube, and to connect the emitter of the second chopper switch tube of the first variable circuit with the collector of the first chopper switch tube of the second variable circuit.

[0033] Continuing with the above example, Figure 3 A schematic structural diagram of a composite busbar connecting the first variable sub-circuit and the second variable sub-circuit provided in an embodiment of the present application is shown as follows: Figure 3 As shown, the C end of Q1 is connected to the C end of Q3, the C end of Q5 is connected to the C end of Q7, the e end of Q2 is connected to the e end of Q4, the e end of Q6 is connected to the e end of Q8, and the e end of Qb2 is connected to the C end of Qb3.

[0034] In this embodiment, the composite busbar's first connection structure connects two three-level chopper circuits in series, with the subsequent resonant circuit adopting a full-bridge LLC topology. This structure is suitable for a 1500V DC power supply network. A single chopper circuit has a 750V DC input and a 1050V DC output. Therefore, a 1200V switching device can be used for the chopper tube, and a 1700V switching device can be used for the resonant tube.

[0035] In some embodiments, the composite busbar also includes: a second connection structure, which is used to connect the emitter of the second resonant switch tube in the first variable sub-circuit and the second variable sub-circuit to the negative electrode of the first chopping capacitor and the collector of the third resonant switch tube; and to connect the emitter of the second chopping switch tube in the first variable sub-circuit to the collector of the second chopping switch tube in the second variable sub-circuit.

[0036] Continuing with the above example, Figure 4 Another structural diagram of a composite busbar provided in an embodiment of the present application connecting the first variable sub-circuit and the second variable sub-circuit is shown as follows: Figure 4 As shown, the e-terminal of Q2 is connected to the -terminal of Cb1 and the c-terminal of Q3; the e-terminal of Q6 is connected to the -terminal of Cb3 and the c-terminal of Q7; the e-terminal of Qb2 is connected to the c-terminal of Qb3.

[0037] In the embodiment of the present application, two three-level chopper circuits are connected in series via the composite busbar's second connection structure, and the subsequent resonant circuit adopts a series half-bridge LLC topology. This structure is suitable for a DC3600V power supply network. The input of a single chopper circuit is DC1800V, and the output is DC2100V. Therefore, both the chopper and resonant tubes can use 1700V switching devices. If the first connection structure is still used for a 3600V power supply network, the resonant tube must use a 3300V device, which will significantly increase the cost and size.

[0038] In some embodiments, the composite busbar also includes: a third connection structure, which is used to connect the collector of the first resonant switch tube in the first variable subcircuit and the second variable subcircuit to the emitter of the third resonant switch tube, and connect the emitter of the second resonant switch tube in the first variable subcircuit and the second variable subcircuit to the emitter of the fourth resonant switch tube, and connect the collector of the first chopper switch in the first variable subcircuit to the collector of the first chopper unit in the second variable subcircuit, and connect the emitter of the second chopper switch tube in the first variable subcircuit to the emitter of the second chopper unit of the second chopper switch tube in the second variable subcircuit.

[0039] Continuing with the above example, Figure 5 Another structural diagram of a composite busbar provided in an embodiment of the present application connecting the first variable sub-circuit and the second variable sub-circuit is shown as follows: Figure 5As shown, the C end of Q1 is connected to the C end of Q3, the C end of Q5 is connected to the C end of Q7, the e end of Q2 is connected to the e end of Q4, the e end of Q6 is connected to the e end of Q8, the e end of Qb2 is connected to the e end of Qb4, and the C end of Qb3 is connected to the C end of Qb1.

[0040] In this embodiment, two three-level chopper circuits are connected in parallel via the composite busbar's third connection structure, resulting in a full-bridge LLC topology for the subsequent resonant circuit. This structure is suitable for a 750V DC power supply network. A single chopper circuit has a 750V DC input and a 1050V DC output. Therefore, a 1200V switching device can be used for the chopper tube, and a 1700V switching device can be used for the resonant tube.

[0041] In the embodiment of the present application, the following formula is the soft switching margin of LLC:

[0042]

[0043] This formula characterizes the freewheeling time of the switching device's body diode. During this time, switching is achieved at zero voltage. A larger margin indicates a higher tolerance for pulse and driver delay errors, which in turn increases the likelihood of achieving soft switching. As shown in the following formula, the soft switching margin is positively correlated with the square of the LLC input voltage. For a DC750V supply, if the composite busbar is connected using the first connection configuration, the LLC input voltage is only 525V. However, using the composite busbar's third connection configuration to connect the first and second variable sub-circuits increases the LLC input voltage to DC1050V, significantly improving the soft switching margin.

[0044] The present invention provides a converter module that utilizes a single basic module (i.e., a first variable subcircuit and a second variable subcircuit) that can be configured into a variety of topologies to suit different application scenarios. Within a certain voltage level and power range, the module structure remains unchanged; capacitors and switching components only need to be replaced to adapt to the input grid voltage and power level, thus reducing the workload of module design.

[0045] In the embodiments of the present application, the configured composite busbar includes: a first connection structure, a second connection structure, and a third connection structure, which allows for flexible topology changes. The composite busbar has a fixed external structure; only minor changes to the connection structure are required to implement a half-bridge series LLC topology at a DC3600V grid voltage, and an input three-level chopper parallel topology at a DC750V grid voltage and high power, providing flexible configuration.

[0046] In the embodiment of the present application, the design of a new module only requires configuring the composite busbar, capacitors, and switching devices in the module to complete the module design work. The structural components of the modules with different configurations are completely unified and mass-produced, which can greatly reduce costs.

[0047] In the embodiment of the present application, it is possible to ensure that modules with different input voltage levels and different capacities have a unified design style and consistent size, forming a family of products and enhancing replaceability.

[0048] Based on the aforementioned converter module, an embodiment of the present application further provides a converter, which includes the converter module in any of the aforementioned embodiments.

[0049] In some embodiments, the converter further includes: a heat sink, and the converter module is disposed on the heat sink.

[0050] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0051] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, object, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, object, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, object, or apparatus comprising the element.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0053] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0054] In addition, all functional units in the embodiments of the present application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the above-mentioned integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0055] Those skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROMs), magnetic disks, optical disks, and other media that can store program codes.

[0056] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a controller to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks or optical disks.

[0057] The above is merely an embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A converter module, characterized in that: include: A first variable subcircuit and a second variable subcircuit, and a composite busbar, wherein the first variable subcircuit has the same structure as the second variable subcircuit, and the first variable subcircuit and the second variable subcircuit include: a first chopper switch tube, a second chopper switch tube, a first chopper diode, a second chopper diode, a first chopper capacitor, a second chopper capacitor, a first resonant switch tube, a second resonant switch tube, a third resonant switch tube, a fourth resonant switch tube, and a resonant capacitor; the collector of the first chopper switch tube is connected to the positive electrode of the first chopper diode, the negative electrode of the first chopper diode is connected to the positive electrode of the first chopper capacitor and the collector of the first resonant switch tube, and the emitter of the first chopper switch tube is connected to the collector of the second chopper switch tube and the first chopper capacitor. The negative electrode of the second chopper switch tube is connected to the negative electrode of the second chopper diode, the negative electrode of the second chopper capacitor is connected to the positive electrode of the second chopper diode and the emitter of the fourth resonant switch, the emitter of the first resonant switch tube is connected to the positive electrode of the resonant capacitor and the collector of the second resonant switch tube, and the emitter of the third resonant switch tube is connected to the collector of the fourth resonant switch tube; the collector of the first chopper switch tube of the first variable sub-circuit is used to connect to the positive electrode of the power supply network, and the emitter of the second chopper switch tube of the second variable sub-circuit is connected to the negative electrode of the power supply network. The composite busbar can be used to connect the first variable sub-circuit and the second variable sub-circuit to construct multiple circuit topologies, each circuit topology can adapt to a corresponding power supply network; The composite busbar includes a first connection structure, which is used to connect the collector of the first resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the collector of the third resonant switch tube, and to connect the emitter of the second resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the emitter of the fourth resonant switch tube, and to connect the emitter of the second chopper switch tube of the first variable circuit with the collector of the first chopper switch tube of the second variable circuit.

2. The converter module according to claim 1, characterized in that The voltage of the power supply network comprises 1500V.

3. The converter module according to claim 1, characterized in that The composite busbar also includes: a second connection structure, which is used to connect the emitter of the second resonant switch tube in the first variable sub-circuit and the second variable sub-circuit with the negative electrode of the first chopping capacitor and the collector of the third resonant switch tube; and to connect the emitter of the second chopping switch tube in the first variable sub-circuit with the collector of the second chopping switch tube in the second variable sub-circuit.

4. The converter module according to claim 3, characterized in that The voltage of the power supply network includes: 3600V.

5. The converter module according to claim 3, characterized in that: The composite busbar also includes: a third connection structure, which is used to connect the collector of the first resonant switch tube in the first variable subcircuit and the second variable subcircuit with the emitter of the third resonant switch tube, and connect the emitter of the second resonant switch tube in the first variable subcircuit and the second variable subcircuit with the emitter of the fourth resonant switch tube, and connect the collector of the first chopper switch in the first variable subcircuit with the collector of the first chopper unit in the second variable subcircuit, and connect the emitter of the second chopper switch tube in the first variable subcircuit with the emitter of the second chopper unit of the second chopper switch tube in the second variable subcircuit.

6. The converter module according to claim 5, characterized in that The voltage of the power supply network includes: 750V.

7. The converter module according to claim 1, characterized in that The rated voltage of the chopper switch tube is 1200V, and the rated voltage of the resonant switch tube is 1700V.

8. A converter, characterized in that: The converter module comprises the converter module according to any one of claims 1 to 7.

9. The converter according to claim 8, characterized in that The converter further includes a heat sink, and the converter module is arranged on the heat sink.

Images