High-voltage cascade module and cascade system

Abstract

The utility model discloses a high-voltage cascade module and a cascade system, and relates to the field of electric power, a plurality of power units can be connected in series or in parallel, the normal work of the high-voltage cascade module can be realized, and the whole high-voltage cascade module can be suitable for different power requirements due to the two different connection modes; no matter in series connection or parallel connection, the input ends of the high-voltage cascade modules are all connected with the input ends of the first power units, and the output ends of the high-voltage cascade modules are all connected with the output ends of the second power units, so that the universal design of ports of the cascade modules is realized; through series connection or parallel connection, the same high-voltage cascade module can meet different power requirements of the whole system, power required by most cascade modules is covered, a universal and modular design is realized, the structural layout of the high-voltage cascade module with huge difference in different application scenes is avoided, the application cost of the high-voltage cascade module is reduced, and the application range of the high-voltage cascade module is widened. And the universal standardized module design of series design of cascade products is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of electric power, in particular to a high-voltage cascade module and a cascade system. Background Art

[0002] With the continuous development of high-voltage cascade modules, they may be used in high-power application scenarios and low-power application scenarios. In low-power application scenarios, the power range that the high-voltage cascade module needs to cover is small, and a single power tube can meet the application requirements; in high-power application scenarios, the power range that the high-voltage cascade module needs to cover is large, and usually a single power tube cannot meet it, and multiple power tubes need to be connected in parallel to meet high-power application requirements. How to ensure the normal operation of the high-voltage cascade module in application scenarios with different power ranges and meet the application requirements of different power ranges is a technical problem that needs to be solved urgently.

[0003] In the prior art, a high-voltage cascade module including a single power tube and another high-voltage cascade module including a plurality of parallel power tubes are provided, and two separate high-voltage cascade modules are used to respectively realize the application requirements of low-power application scenarios and high-power application scenarios. However, in this case, the overall structural layouts of the two high-voltage cascade modules are quite different, the versatility is poor, the structural design of the whole machine cannot be serialized, and the power cabinets of different models are highly non-standardized; and multiple high-voltage cascade modules for different application scenarios need to be separately provided, resulting in poor module cost control and high costs. Utility Model Content

[0004] The purpose of the utility model is to provide a high-voltage cascade module and a cascade system, which enable the same high-voltage cascade module to meet different power requirements of the entire system through series or parallel connection, covering the power required by most cascade modules, realizing a universal modular design, avoiding the huge differences in structural layouts of the high-voltage cascade module in different applicable scenarios, reducing the application cost of the high-voltage cascade module, and facilitating a universal standardized module design for the serialized design of cascade products.

[0005] In order to solve the above technical problems, the utility model provides a high voltage cascade module, comprising:

[0006] A first port, serving as an input end of the high voltage cascade module;

[0007] A second port, serving as an output end of the high voltage cascade module;

[0008] A plurality of power units, each of which includes an input end and an output end, and the plurality of power units include at least a first power unit and a second power unit, the input end of the first power unit is connected to the first port, and the output end of the second power unit is connected to the second port;

[0009] When the required power of the high-voltage cascade module is less than a threshold value, several of the power units are connected in series, and the input end of the first power unit serves as the input end of the series-connected circuit, and the output end of the second power unit serves as the output end of the series-connected circuit; when the required power of the high-voltage cascade module is greater than the threshold value, several of the power units are connected in parallel.

[0010] Optionally, the power unit includes a first half-bridge IGBT and a second half-bridge IGBT, the first end of the first half-bridge IGBT is connected to the first end of the second half-bridge IGBT, the second end of the first half-bridge IGBT is connected to the second end of the second half-bridge IGBT, the center point of the first half-bridge IGBT serves as the input end of the power unit, and the center point of the second half-bridge IGBT serves as the output end of the power unit.

[0011] Optionally, the first half-bridge IGBT and the second half-bridge IGBT both include a first IGBT and a second IGBT connected in series, the first end of the first IGBT serves as the first end of the half-bridge IGBT to which it belongs, the second end is connected to the first end of the second IGBT and serves as the center point of the half-bridge IGBT to which it belongs, and the second end of the second IGBT serves as the second end of the half-bridge IGBT to which it belongs.

[0012] Optionally, the power unit also includes a first capacitor and a second capacitor, the first end of the first capacitor is respectively connected to the first end of the first half-bridge IGBT and the first end of the second half-bridge IGBT, and the second end is respectively connected to the second end of the first half-bridge IGBT and the second end of the second half-bridge IGBT, the first end of the second capacitor is respectively connected to the first end of the first half-bridge IGBT and the first end of the second half-bridge IGBT, and the second end is respectively connected to the second end of the first half-bridge IGBT and the second end of the second half-bridge IGBT.

[0013] Optionally, the power unit further includes a plurality of fixed capacitors connected in parallel, and the plurality of fixed capacitors are connected in parallel and are connected in parallel at both ends of the first half-bridge IGBT and at both ends of the second half-bridge IGBT.

[0014] Optionally, the high-voltage cascade module further includes a circuit board, and the plurality of power units, the first port and the second port are all arranged at preset fixed positions on the circuit board.

[0015] Optionally, the packaging structures of the plurality of power units are the same, and the sizes of the packaging bodies corresponding to the plurality of power units are consistent.

[0016] In order to solve the above technical problems, the utility model further provides a cascade system, comprising a plurality of high-voltage cascade modules as described above, wherein the plurality of high-voltage cascade modules are connected in series or in parallel.

[0017] The utility model provides a high-voltage cascade module, comprising a plurality of power units and a first port and a second port serving as an input end and an output end respectively. The plurality of power units can be connected in series or in parallel, and both can realize the normal operation of the high-voltage cascade module. The two different connection modes can make the entire high-voltage cascade module suitable for different power requirements; no matter whether they are connected in series or in parallel, the input end of the high-voltage cascade module is connected to the input end of the first power unit, and the output end is connected to the output end of the second power unit, thereby realizing the universal design of the port of the cascade module; through series or parallel connection, the same high-voltage cascade module can meet the different power requirements of the entire system, covering the required power of most cascade modules, realizing universal modular design, avoiding the structural layout of the high-voltage cascade module with huge differences in different application scenarios, reducing the application cost of the high-voltage cascade module, and being conducive to the universal standardized module design of the serialized design of cascade products.

[0018] The utility model also provides a cascade system, which has the same beneficial effects as the above-mentioned high-voltage cascade module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a high-voltage cascade module provided by the utility model;

[0021] Figure 2 This is a structural schematic diagram of a high-voltage cascade module in a series connection mode provided by the utility model;

[0022] Figure 3 A schematic diagram of the structure of a high-voltage cascade module in a parallel connection mode provided by the utility model;

[0023] Figure 4 This is a structural schematic diagram of another high-voltage cascade module provided by the utility model. DETAILED DESCRIPTION

[0024] The core of the utility model is to provide a high-voltage cascade module and a cascade system. Through series or parallel connection, the same high-voltage cascade module can meet the different power requirements of the entire system, covering the required power of most cascade modules, realizing a universal modular design, avoiding the huge differences in structural layout of the high-voltage cascade module in different application scenarios, reducing the application cost of the high-voltage cascade module, and facilitating a universal standardized module design for the serialized design of cascade products.

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a high-voltage cascade module provided by the utility model; the two output ports of each power unit are the input end and the output end of each power unit, please refer to Figure 2 , Figure 2 This is a structural diagram of a high-voltage cascade module in a series connection mode provided by the utility model; please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a high-voltage cascade module in a parallel connection mode provided by the utility model; please refer to Figure 4 , Figure 4 This is a structural schematic diagram of another high-voltage cascade module provided by the utility model. In order to solve the above technical problems, the utility model provides a high-voltage cascade module 1, including:

[0027] The first port is used as the input end of the high voltage cascade module 1;

[0028] The second port is used as the output end of the high voltage cascade module 1;

[0029] A plurality of power units 2, each of which includes an input end and an output end, and the plurality of power units 2 include at least a first power unit 21 and a second power unit 22, wherein the input end of the first power unit 21 is connected to the first port, and the output end of the second power unit 22 is connected to the second port;

[0030] When the required power of the high-voltage cascade module 1 is less than a threshold value, several power units 2 are connected in series, and the input end of the first power unit 21 serves as the input end of the series-connected circuit, and the output end of the second power unit 22 serves as the output end of the series-connected circuit; when the required power of the high-voltage cascade module 1 is greater than a threshold value, several power units 2 are connected in parallel.

[0031] Specifically, the power unit 2 includes a power tube. When the required power of the high-voltage cascade module 1 is less than a threshold, that is, the high-voltage cascade module 1 needs to be applied in a low-power scenario, a single power tube can meet the requirement of low-power output. Therefore, all power units 2 are connected in series to support the low-power application scenario of the high-voltage cascade module 1. When the required power of the high-voltage cascade module 1 is greater than the threshold, that is, the high-voltage cascade module 1 needs to be applied in a high-power scenario, a single power tube and a single power unit 2 cannot carry high power. It is necessary to connect multiple power tubes, that is, multiple power units 2 in parallel. The multiple power tubes in the multiple parallel power units 2 are also connected in parallel, thereby increasing the power carrying capacity of the entire high-voltage cascade module 1 and enabling the high-voltage cascade module 1 to be normally and effectively applied in high-power scenarios. Regardless of whether it is connected in series or in parallel, the first port corresponding to the input end of the high-voltage cascade module 1 is connected to the input end of the first power unit 21, and the second port corresponding to the output end of the high-voltage cascade module 1 is connected to the output end of the second power unit 22. Therefore, the setting method of the first port and the second port of the high-voltage cascade module 1 can remain fixed, so that the same high-voltage cascade module 1 can achieve multi-functionality by adjusting the connection method of the internal power unit 2, and can be suitable for application scenarios in different power ranges at the same time.

[0032] It is not difficult to understand that the present application does not make any special restrictions on the specific value of the threshold value, etc., and can be selected and adjusted according to the specific situation of the power unit 2; the present application does not make any special restrictions on the specific setting method of the first port and the second port, etc., and the present application does not make any special restrictions on the specific circuit structure, connection method and implementation method of the power unit 2. The input and output ends of each power unit 2 can be realized by a copper bus, and the connection between each other is realized by the connection between the copper bus. The high-voltage cascade module 1 provided in the present application is a universal cascade module for series and parallel connection. By developing a module design, the same power tubes with the same package and different current specifications are used inside the module to realize the same design of several power units 2. Different power segments can be covered by simply adjusting the connection method between the power units 2. There is no need to replace different types of high-voltage cascade modules 1 or adjust the internal implementation method of the high-voltage cascade module 1, thereby realizing the serialization of universal module products.

[0033] Specifically, the connection method of several power units 2 connected in series is as follows: Figure 2As shown, the connection method of several power units 2 connected in parallel is as follows Figure 3 As shown, the setting positions of each power unit 2, the first port and the second port remain unchanged, and only the connection method between the power units 2 is changed, thereby realizing a universal high-voltage cascade module 1. The universal cascade module takes into account the series and parallel capabilities. The same high-voltage cascade module 1 of the same size can basically cover the power range required by most cascade topologies, and can directly cover the current range of 200A-1800A, thereby realizing the universal design of the cascade module.

[0034] As a specific embodiment, Figure 4 As shown, based on the high-voltage cascade module 1 provided in the present application, a universal high-voltage cascade module 1 can be developed, and the high-voltage cascade module 1 contains two power units 2, and the two units can be used in series or in parallel, so as to realize the universalization of more power segment modules. The input end and the output end of the first power unit 21 are T1 and T2 respectively, and the input end and the output end of the second power unit 22 are T3 and T4 respectively. The high-voltage cascade module 1 supports the series working mode and the parallel working mode. The series working mode is applied when the current of the IGBT single tube can meet the requirements, the T2 of the first power unit 21 and the T3 of the second power unit 22 are connected, and T1 and T4 are both externally output; the parallel working mode is applied when the IGBT double tubes need to be connected in parallel to meet the requirements, the T1 of the first power unit 21 and the T3 of the second power unit 22 are connected in parallel and then externally output, and the T2 of the first power unit 21 and the T4 of the second power unit 22 are connected in parallel and then externally output.

[0035] The present application designs a universal series-parallel cascade module, and the power tubes in the module can all be selected as universal ME4-packaged IGBT (Insulated Gate Bipolar Transistor) modules. The current supported by this type of IGBT module covers 200A-900A, so that the entire high-voltage cascade module 1 can cover more power segments; the entire high-voltage cascade module 1 adopts a two-power unit 2-in-one module design, and each power unit 2 can be connected in series or in parallel. When the power carried by the IGBT corresponding to a single power unit 2 is insufficient, the power units 2 inside the module can be connected in parallel to achieve coverage of more power segments, thereby realizing a universal design of most power segment modules.

[0036] The utility model provides a high-voltage cascade module 1, comprising a plurality of power units 2 and a first port and a second port serving as an input end and an output end respectively. The plurality of power units 2 can be connected in series or in parallel, and both can realize the normal operation of the high-voltage cascade module 1. The two different connection modes can make the entire high-voltage cascade module 1 suitable for different power requirements; no matter it is connected in series or in parallel, the input end of the high-voltage cascade module 1 is connected to the input end of the first power unit 21, and the output end is connected to the output end of the second power unit 22, thereby realizing the universal design of the port of the cascade module; through series or parallel connection, the same high-voltage cascade module 1 can meet the different power requirements of the entire system, covering the required power of most cascade modules, realizing universal modular design, avoiding the structural layout of the high-voltage cascade module 1 with huge differences in different application scenarios, reducing the application cost of the high-voltage cascade module 1, and being conducive to the universal standardized module design of the serialized design of cascade products.

[0037] Based on the above embodiments:

[0038] As an optional embodiment, the power unit 2 includes a first half-bridge IGBT and a second half-bridge IGBT, the first end of the first half-bridge IGBT is connected to the first end of the second half-bridge IGBT, the second end of the first half-bridge IGBT is connected to the second end of the second half-bridge IGBT, the center point of the first half-bridge IGBT serves as the input end of the power unit 2, and the center point of the second half-bridge IGBT serves as the output end of the power unit 2.

[0039] It is not difficult to understand that the power unit 2 can be realized by two half-bridge IGBTs connected in parallel. The center points of the two half-bridge IGBTs serve as the input and output ends of the power unit 2 respectively. The half-bridge IGBT has a certain anti-unbalance capability and is not very strict on circuit symmetry. It can adapt to a large power range, from tens of watts to kilowatts, further improving the scope of application of the entire high-voltage cascade module 1. The half-bridge IGBT has lower withstand voltage requirements for the internal power tube. The cost of the entire circuit is lower than that of the full-bridge circuit. As the power tube structure inside the power unit 2, the half-bridge IGBT can effectively realize the power unit 2. The two parallel half-bridge IGBTs can further expand the applicable power segment of the entire high-voltage cascade module 1. Figure 4 As shown, the first power unit 21 includes a first half-bridge IGBT Q1 and a second half-bridge IGBT Q2 , and the second power unit 22 includes a first half-bridge IGBT Q3 and a second half-bridge IGBT Q4 .

[0040] Specifically, the first half-bridge IGBT and the second half-bridge IGBT connected in parallel can effectively realize the power unit 2, and the entire circuit structure is simple and easy to implement, which can further expand the power segment applicable to the entire high-voltage cascade module 1, improve the application scope of the entire high-voltage cascade module 1, clarify the internal structure of the power unit 2, and is conducive to the simple implementation of the power unit 2 and the entire high-voltage cascade module 1.

[0041] As an optional embodiment, the first half-bridge IGBT and the second half-bridge IGBT both include a first IGBT and a second IGBT connected in series, the first end of the first IGBT serves as the first end of the half-bridge IGBT to which it belongs, the second end is connected to the first end of the second IGBT and serves as the center point of the half-bridge IGBT to which it belongs, and the second end of the second IGBT serves as the second end of the half-bridge IGBT to which it belongs.

[0042] It is not difficult to understand that the half-bridge IGBT includes a first IGBT and a second IGBT connected in series, and the connection point of the first IGBT and the second IGBT in series is the center point of the corresponding half-bridge IGBT. The control mode and working process of the first IGBT and the second IGBT can be selected and adjusted according to the specific application scenario of the high-voltage cascade module 1, and this application does not make any special restrictions here. Figure 4 As shown, the two half-bridge IGBTs in the first power unit 21, namely Q1 and Q2, each include two IGBT devices connected in series, and the two half-bridge IGBTs in the second power unit 22, namely Q3 and Q4, each include two IGBT devices connected in series.

[0043] Specifically, the first IGBT and the second IGBT connected in series can effectively realize a half-bridge IGBT, and the half-bridge IGBT inside each power unit 2 can be implemented using this structure. The unified implementation method of the power unit 2 can further improve the versatility of the power unit 2, and further ensure the versatility of the entire high-voltage cascade module 1. The entire circuit structure is simple and easy to implement, and the internal structure of the power unit 2 is further clarified, which is conducive to the simple implementation of the power unit 2 and the entire high-voltage cascade module 1.

[0044] As an optional embodiment, the power unit 2 also includes a first capacitor and a second capacitor, the first end of the first capacitor is respectively connected to the first end of the first half-bridge IGBT and the first end of the second half-bridge IGBT, and the second end is respectively connected to the second end of the first half-bridge IGBT and the second end of the second half-bridge IGBT, the first end of the second capacitor is respectively connected to the first end of the first half-bridge IGBT and the first end of the second half-bridge IGBT, and the second end is respectively connected to the second end of the first half-bridge IGBT and the second end of the second half-bridge IGBT.

[0045] It is not difficult to understand that a first capacitor and a second capacitor connected in parallel at both ends of the first half-bridge IGBT and the second half-bridge IGBT can be added to the power unit 2. Further adding capacitors connected in parallel at both ends of the half-bridge IGBT can further improve the stability of the circuit of the entire power unit 2 and improve the power quality. The specific types and implementation methods of the first capacitor and the second capacitor are not particularly limited in this application. Figure 4 As shown, a first capacitor SC1 and a second capacitor SC2 may be additionally provided in the first power unit 21 , and a first capacitor SC3 and a second capacitor SC4 may be additionally provided in the second power unit 22 .

[0046] Specifically, the stability of the entire circuit can be further improved by adding a first capacitor and a second capacitor connected in parallel with the two half-bridge IGBTs. The entire circuit structure is simple and easy to implement, and the internal structure of the power unit 2 is further clarified, which is conducive to the simple implementation of the power unit 2 and the entire high-voltage cascade module 1, further improving the working stability of the power unit 2, and ensuring the stability and reliability of the entire high-voltage cascade module 1.

[0047] As an optional embodiment, the power unit 2 further includes a plurality of fixed capacitors connected in parallel, and the plurality of fixed capacitors are connected in parallel and are connected in parallel between two ends of the first half-bridge IGBT and two ends of the second half-bridge IGBT.

[0048] Furthermore, on the basis of the first capacitor and the second capacitor, a plurality of fixed capacitors connected in parallel at both ends of the first half-bridge IGBT and the second half-bridge IGBT can be added to the power unit 2 to further improve the stability of the circuit of the entire power unit 2. The specific type, number of settings and implementation methods of the fixed capacitors are not particularly limited in this application. Figure 4 As shown, six capacitors including fixed capacitors C1 to C6 may be added to the first power unit 21 , and six capacitors including fixed capacitors C7 to C12 may be added to the second power unit 22 .

[0049] Specifically, on the basis of the first capacitor and the second capacitor, several fixed capacitors connected in parallel at both ends of the first half-bridge IGBT and the second half-bridge IGBT can be added in the power unit 2 to further improve the stability of the entire circuit. The entire circuit structure is simple and easy to implement, and the internal structure of the power unit 2 is further clarified, which is conducive to the simple implementation of the power unit 2 and the entire high-voltage cascade module 1, further improving the working stability of the power unit 2, and ensuring the stability and reliability of the entire high-voltage cascade module 1.

[0050] As an optional embodiment, the high-voltage cascade module 1 further includes a circuit board, and the plurality of power units 2, the first port and the second port are all arranged at preset fixed positions on the circuit board.

[0051] It is not difficult to understand that in order to realize the standard modularization of the high-voltage cascade module 1, the several power units 2, the first port and the second port inside the high-voltage cascade module 1 are set based on the preset fixed position when setting. In the application process of the high-voltage cascade module 1, the several power units 2, the first port and the second port are always kept fixed in the preset fixed position. It is only necessary to adjust the different connection methods of the output copper bars of each power unit 2 according to the application scenario, unify the layout and arrangement of the high-voltage cascade module 1, so that the setting method of the entire high-voltage cascade module 1 is standardized and suitable for different application scenarios; the specific type and implementation method of the circuit board, etc. are not specifically limited in this application, and the specific implementation method of the preset fixed position, etc. are not specifically limited in this application, and can be set according to the design size and shape of the high-voltage cascade module 1. In different power application scenarios of the high-voltage cascade module 1, in addition to the connection method between each power unit 2, the setting method of each power unit 2, the setting method of the first port and the second port, etc. can all be kept consistent, further ensuring the versatility of the entire high-voltage cascade module 1.

[0052] Specifically, the present application realizes different connection methods by connecting two or more power units 2 through different arrangements of their own output copper bars, thereby realizing a series layout or a parallel layout. However, regardless of the series layout or the parallel layout, the size and internal layout of the high-voltage cascade module 1 remain the same, thereby realizing the standard modularization of different power modules of the mainstream cascade topology. The power units 2 can be unified into one size, and the overall machine has high consistency in structural layout, further improving the standardization of the entire high-voltage cascade module 1.

[0053] As an optional embodiment, the packaging structures of the plurality of power units 2 are the same, and the sizes of the packaging bodies corresponding to the plurality of power units 2 are consistent.

[0054] It is not difficult to understand that in order to further improve the standard uniformity of the high-voltage cascade module 1 and the versatility and standardization of the power unit 2, the packaging structure of each power unit 2, the size and shape of the package body formed after packaging, etc. can be kept consistent, so as to achieve unified and standardized power units 2. This application does not make any special restrictions on the packaging method adopted by each power unit 2 and the specific implementation method of the package body.

[0055] Specifically, the present application designs a universal series-parallel cascade module, which contains two units inside the module. The two units can work in series or in parallel. The series and parallel operation meet the different power requirements of the system, covering the required power of most cascade modules, and realizing a universal modular design; the specific implementation methods and packaging processes of each internal power unit 2 can be kept consistent, further realizing a universal standardized module design for the serialized design of cascade products.

[0056] In order to solve the above technical problems, the utility model further provides a cascade system, comprising a plurality of high-voltage cascade modules 1 as described above, wherein the plurality of high-voltage cascade modules 1 are connected in series or in parallel.

[0057] It is not difficult to understand that the high-voltage cascade module 1 can also be connected in series or in parallel according to application requirements during the application process. The present application does not make any special restrictions on the specific setting method of the high-voltage cascade module 1 during the application process. The high-voltage cascade module 1 of this type with strong versatility provided by the present application can be suitable for a variety of application scenarios. Therefore, each high-voltage cascade module 1 in the cascade system can be implemented using the high-voltage cascade module 1 of this type provided by the present application, without the need to additionally design other types of high-voltage cascade modules 1, which greatly reduces the cost of designing the high-voltage cascade module 1 and the entire cascade system.

[0058] For an introduction to a cascade system provided by the present invention, please refer to the above-mentioned embodiment of the high-voltage cascade module 1, and the present invention will not be described in detail here.

[0059] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0060] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high voltage cascade module, characterized in that: include: A first port, serving as an input end of the high voltage cascade module; A second port, serving as an output end of the high voltage cascade module; A plurality of power units, each of which includes an input end and an output end, and the plurality of power units include at least a first power unit and a second power unit, the input end of the first power unit is connected to the first port, and the output end of the second power unit is connected to the second port; When the required power of the high-voltage cascade module is less than a threshold value, several of the power units are connected in series, and the input end of the first power unit serves as the input end of the series-connected circuit, and the output end of the second power unit serves as the output end of the series-connected circuit; when the required power of the high-voltage cascade module is greater than the threshold value, several of the power units are connected in parallel.

2. The high voltage cascade module according to claim 1, characterized in that: The power unit includes a first half-bridge IGBT and a second half-bridge IGBT, the first end of the first half-bridge IGBT is connected to the first end of the second half-bridge IGBT, the second end of the first half-bridge IGBT is connected to the second end of the second half-bridge IGBT, the center point of the first half-bridge IGBT serves as the input end of the power unit, and the center point of the second half-bridge IGBT serves as the output end of the power unit.

3. The high voltage cascade module according to claim 2, characterized in that: The first half-bridge IGBT and the second half-bridge IGBT both include a first IGBT and a second IGBT connected in series, the first end of the first IGBT serving as the first end of the half-bridge IGBT to which it belongs, the second end being connected to the first end of the second IGBT and serving as the center point of the half-bridge IGBT to which it belongs, and the second end of the second IGBT serving as the second end of the half-bridge IGBT to which it belongs.

4. The high voltage cascade module according to claim 3, characterized in that: The power unit also includes a first capacitor and a second capacitor, wherein the first end of the first capacitor is connected to the first end of the first half-bridge IGBT and the first end of the second half-bridge IGBT respectively, and the second end is connected to the second end of the first half-bridge IGBT and the second end of the second half-bridge IGBT respectively, and the first end of the second capacitor is connected to the first end of the first half-bridge IGBT and the first end of the second half-bridge IGBT respectively, and the second end is connected to the second end of the first half-bridge IGBT and the second end of the second half-bridge IGBT respectively.

5. The high voltage cascade module according to claim 4, characterized in that: The power unit further includes a plurality of fixed capacitors connected in parallel, wherein the plurality of fixed capacitors are connected in parallel and are connected in parallel at both ends of the first half-bridge IGBT and at both ends of the second half-bridge IGBT.

6. The high voltage cascade module according to any one of claims 1 to 5, characterized in that: The high-voltage cascade module further includes a circuit board, and the plurality of power units, the first port and the second port are all arranged at preset fixed positions on the circuit board.

7. The high voltage cascade module according to claim 6, characterized in that: The packaging structures of the power units are the same, and the sizes of the packaging bodies corresponding to the power units are consistent.

8. A cascade system, characterized in that: It comprises a plurality of high-voltage cascade modules as claimed in any one of claims 1 to 7, wherein the plurality of high-voltage cascade modules are connected in series or in parallel.

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