Power module and inverter based on three-level topology

Abstract

The utility model embodiment's power module based on three electric level topology, include: the first power module of vertical setting in the one side of module, the first power module includes first outer pipe bridge arm, With the second power module of first power module same side parallel setting, second power module includes second outer pipe bridge arm, and the input of first outer pipe bridge arm and the input of second outer pipe bridge arm are connected with direct current input end, Corresponding to the third power module between first power module and second power module and parallel setting in the other side of module, third power module includes inner tube bridge arm, and the output of first outer pipe bridge arm and the output of second outer pipe bridge arm are connected with the input of inner tube bridge arm, and the output of inner tube bridge arm is connected with alternating side, First power module and second power module are Econo DUAL 3 package module, and third power module is 62mm package module. The utility model still provides a kind of inverter. The utility model can realize the detection of circuit temperature while controlling circuit cost.

Description

Technical Field

[0001] This utility model belongs to the field of inverter control technology, and particularly relates to a power module and inverter based on a three-level topology. Background Technology

[0002] In medium- and high-voltage high-power applications, multilevel topologies are widely used due to their advantages such as low harmonic content and high efficiency, with three-level topologies being the most common. A three-level ANPC (Active Neutral Point Clamped) circuit topology is shown below. Figure 1 As shown, a three-level ANPC topology can be constructed using three half-bridge modules: two external modules (T1 / T5 and T6 / T4 modules) and one internal module (T2 / T3 module).

[0003] In a conventional three-level ANPC circuit, the outer transistor is typically used as a high-frequency switch, while the inner transistor is used as a low-frequency switch. Within one power frequency cycle, the outer transistor incurs both conduction and switching losses, while the inner transistor's losses are predominantly conduction losses. Therefore, under the same heat dissipation conditions, the temperature of the outer transistor chip is higher than that of the inner transistor chip.

[0004] Existing three-level ANPC circuits mostly use three identical single-package modules. In current high-power renewable energy inverter and rectifier systems, Econo Dual 3 package and 62mm package IGBT half-bridge modules are relatively widely used, among which: The Econo Dual 3 packaged module contains an internal NTC (Negative Temperature Coefficient) thermistor, which can detect the internal temperature of the module and can be used for protection designs at high temperatures. However, the module is expensive, which puts pressure on cost planning. The 62mm package module does not have an internal NTC thermistor. The module price is relatively low, but it cannot detect the internal temperature of the module. If the temperature becomes too high due to overload, it cannot protect against it in time, which can easily cause the module to fail due to high temperature.

[0005] How to control circuit costs while simultaneously detecting circuit temperature to ensure electrical safety is a technical problem that urgently needs to be solved. Utility Model Content

[0006] This utility model provides a power module based on a three-level topology, aiming to solve the technical problem of how to detect circuit temperature to ensure electrical safety while controlling circuit cost.

[0007] This invention is implemented as follows: a power module based on a three-level topology, comprising: A first power module is vertically disposed on one side of the module, the first power module including a first outer tube bridge arm; A second power module is arranged side-by-side with the first power module. The second power module includes a second external bridge arm, and the input terminals of both the first and second external bridge arms are connected to a DC input terminal. A third power module, which is arranged in parallel to the first power module and the second power module on the other side of the module, includes an inner tube bridge arm. The output ends of the first outer tube bridge arm and the second outer tube bridge arm are connected to the input end of the inner tube bridge arm. The output end of the inner tube bridge arm is connected to the AC side. The first power module and the second power module are Econo DUAL 3 package modules, and the third power module is a 62mm package module.

[0008] Furthermore, the output end of the first outer tube bridge arm and the output end of the second outer tube bridge arm are connected to the input end of the inner tube bridge arm through a first conductive connector; The output end of the inner tube bridge arm is connected to the AC side via a second conductive connector.

[0009] Furthermore, the DC input terminal includes a DC-+ input terminal, a DC-N input terminal, and a DC- input terminal on the DC side; The second input terminal of the first outer tube bridge arm is connected to the first input terminal of the second outer tube bridge arm and the DC_N input terminal; The first input terminal of the first outer tube bridge arm is connected to the DC_+ input terminal; The second input terminal of the second outer tube bridge arm is connected to the DC-input terminal; The output end of the first outer tube bridge arm is connected to the first input end of the inner tube bridge arm through the first conductive connector. The output end of the second outer tube bridge arm is connected to the second input end of the inner tube bridge arm through the first conductive connector.

[0010] Furthermore, the input terminals of the first and second outer tube bridge arms are connected to the DC input terminals via DC multilayer copper busbars.

[0011] Furthermore, the DC multilayer copper busbar includes a DC positive input terminal, a DC N-terminal input terminal, and a DC negative input terminal; The DC positive input terminal is connected to the DC_+ input terminal and the first input terminal of the first external tube bridge arm; The DC N-pole input terminal is connected to the DC_N input terminal, the second input terminal of the first external tube bridge arm, and the first input terminal of the second external tube bridge arm. The DC negative input terminal is connected to the DC- input terminal and the second input terminal of the second external tube bridge arm.

[0012] Furthermore, when multiple power modules based on the three-level topology are connected in parallel, the first conductive connector and the DC multilayer copper busbar both span across the multiple power modules based on the three-level topology, and the second conductive connector spans at least two-thirds of the multiple power modules based on the three-level topology.

[0013] Furthermore, the DC stacked copper busbar and the second conductive connector are located on opposite sides of the module; The first conductive connector is located between the DC stacked copper busbar and the second conductive connector, and is offset from the second conductive connector.

[0014] Furthermore, the first conductive connector includes any one of the following for electrically connecting the inner tube bridge arm, the first outer tube bridge arm, and the second outer tube bridge arm: a stacked copper busbar, a copper strip, a cable, and a stacked busbar. The second conductive connector includes any one of the following for electrically connecting the inner tube bridge arm and the AC side: a stacked copper busbar, a copper strip, a cable, and a stacked busbar.

[0015] Furthermore, the power module based on the three-level topology also includes a heat sink. The first power module, the second power module, and the third power module are attached to the upper surface of the heat sink via thermally conductive components and fixed to the heat sink by fasteners.

[0016] This utility model embodiment also provides an inverter, including: DC switches, DC capacitors, inverter reactors, and AC switches; and According to any of the above-described three-level topology-based power modules, the DC switch connects the DC power supply to the input terminal of the three-level topology-based power module, the DC capacitor is connected in parallel between the DC switch and the input terminal of the three-level topology-based power module, the output terminal of the three-level topology-based power module is connected to the input terminal of the inverter reactor, and the AC switch connects the output terminal of the inverter reactor to the AC output terminal.

[0017] In the power module based on a three-level topology of this utility model embodiment, the two outer tube modules, the first power module and the second power module, which have relatively high temperatures during the use of the power module, adopt EconoDual 3 package modules with NTC thermistors. The third power module, which has relatively low temperatures, adopts a 62mm package module without NTC thermistors. Compared with the three-level ANPC circuit using a single package in the prior art, the power module based on the three-level topology of this solution adopts a hybrid package, which retains the temperature detection function of the higher-temperature module while controlling costs, and ensures the electrical safety of the power module. Attached Figure Description

[0018] Figure 1 A topology diagram of a three-level inverter circuit provided for the prior art; Figure 2 The circuit diagrams of the first power module, the second power module, and the third power module according to an embodiment of this utility model are shown below. Figure 3 This is a schematic diagram of the structure of the first power module and the second power module according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the third power module according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a power module based on a three-level topology according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of multiple power modules based on a three-level topology connected in parallel according to an embodiment of this utility model; Figure 7 This is a schematic diagram of the inverter structure according to an embodiment of the present invention.

[0019] Explanation of key component symbols: Power module based on three-level topology - 10; First power module - 11; First outer tube bridge arm - 111; Second power module - 12; Second outer tube bridge arm - 121; Third power module - 13; Inner tube bridge arm - 131; First conductive connector - 14; Second conductive connector - 15; DC multilayer copper busbar - 16; Heat sink - 17; DC switch - 20; DC capacitor - 30; Inverter reactor - 40; AC switch - 50; Inverter - 100. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0021] In the description of this utility model, it should be understood that the orientation or positional relationship indicated in the description of direction and positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] Please see Figures 1 to 6 The power module 10 based on a three-level topology according to this utility model embodiment includes: A first power module 11 is vertically disposed on one side of the module, and the first power module 11 includes a first outer tube bridge arm 111; A second power module 12 is arranged side-by-side with the first power module 11. The second power module 12 includes a second external bridge arm 121, and the input terminals of the first external bridge arm 111 and the second external bridge arm 121 are connected to a DC input terminal; and The third power module 13, which is located between the first power module 11 and the second power module 12 and is arranged in parallel on the other side of the module, includes an inner tube bridge arm 131. The output ends of the first outer tube bridge arm 111 and the second outer tube bridge arm 121 are connected to the input end of the inner tube bridge arm 131, and the output end of the inner tube bridge arm 131 is connected to the AC side. Among them, the first power module 11 and the second power module 12 are Econo DUAL 3 packaged modules, and the third power module 13 is a 62mm packaged module.

[0025] In the power module 10 based on a three-level topology of this utility model embodiment, the two outer tube modules, the first power module 11 and the second power module 12, which have relatively high temperatures during the use of the power module 10, adopt Econo Dual 3 package modules with NTC thermistors. The third power module 13, which has relatively low temperatures, adopts a 62mm package module without NTC thermistors. Compared with the three-level ANPC circuit using a single package in the prior art, the power module 10 based on the three-level topology of this solution adopts a hybrid package, which retains the temperature detection function of the higher-temperature module while controlling costs, and ensures the electrical safety of the power module 10.

[0026] For the sake of brevity, the term "power module 10" will be used in the following description to refer to the power module 10 based on the three-level topology.

[0027] Specifically, each power module 10 includes three power modules arranged in a triangular pattern: a first power module 11, a second power module 12, and a third power module 13. The first power module 11 and the second power module 12 are of the same type and size, but their type and size differ from that of the third power module 13. The first power module 11 and the second power module 12 are located on the same side of the power module 10, as shown below. Figure 5 As shown above, the third power module 13 is located on the other side of the power module 10, as... Figure 5 As shown on the lower side. The input and output terminals of the first power module 11 and the second power module 12 are located at their respective ends (e.g., top and bottom), and the control terminals are located on their sides. The control terminal of the third power module 13 is located at the end closest to its input terminal. The control terminals of the power modules can be used to control the operating state of the power modules.

[0028] The first power module 11, the second power module 12, and the third power module 13 are arranged on the same horizontal plane. The first power module 11 and the second power module 12 are arranged side by side in the same direction and are perpendicular to each other. At the same time, the third power module 13 is arranged perpendicular to the first power module 11 and the second power module 12, that is, parallel to them, and is positioned between the first power module 11 and the second power module 12, thus forming a triangular shape for the power modules 10.

[0029] The aforementioned first power module 11 may include the first external bridge arm 111 of a three-level ANPC circuit, corresponding to Figure 1 The lower tubes T6 and T4 are in the middle; the second power module 12 is the second outer tube bridge arm 121, corresponding to Figure 1 The upper tubes T1 and T5 in the middle. Figure 2 This is the circuit schematic of the IGBT half-bridge module (first power module 11, second power module 12 and third power module 13).

[0030] Of course, the positions of the upper and lower transistors corresponding to the first power module 11 and the second power module 12 can be interchanged; that is, the first outer transistor bridge arm 111 corresponds to the second power module 12, and the second outer transistor bridge arm 121 corresponds to the first power module 11. The third power module 13 can be the inner transistor bridge arm 131 of a three-level ANPC circuit, corresponding to... Figure 1 T2 and T3 in the example.

[0031] Please see Figures 3 to 5 Furthermore, the output end of the first outer tube bridge arm 111 and the output end of the second outer tube bridge arm 121 are connected to the input end of the inner tube bridge arm 131 through the first conductive connector 14, thereby realizing the electrical connection between the third power module 13 and the first power module 11 and the second power module 12, so that the electrical energy output from the DC side to the first power module 11 and the second power module 12 is output to the third power module 13. The first conductive connector 14 can be approximately L-shaped. The output end of the inner tube bridge arm 131 is connected to the AC side through the second conductive connector 15, and outputs electrical energy to the AC side through the third power module 13 to provide electrical energy to the load on the AC side.

[0032] Furthermore, the first conductive connector 14 includes any one of the following for electrically connecting the inner tube bridge arm 131, the first outer tube bridge arm 111 and the second outer tube bridge arm 121: a stacked copper busbar, a copper strip, a cable and a stacked busbar. The second conductive connector 15 includes any one of the following for electrically connecting the inner tube bridge arm 131 and the AC side: a laminated copper busbar, a copper strip, a cable, and a laminated busbar.

[0033] By providing diverse connection methods, users can choose according to actual needs to realize the conversion of power modules from electrical energy input to output.

[0034] Please see Figures 3 to 5 Furthermore, the DC input terminals include a DC_+ input terminal, a DC_N input terminal, and a DC_- input terminal on the DC side; The second input terminal of the first outer tube bridge arm 111 is connected to the first input terminal and the DC_N input terminal of the second outer tube bridge arm 121; The first input terminal of the first outer tube bridge arm 111 is connected to the DC_+ input terminal; The second input terminal of the second outer tube bridge arm 121 is connected to the DC- input terminal; The output end of the first outer tube bridge arm 111 is connected to the first input end of the inner tube bridge arm 131 through the first conductive connector 14. The output end of the second outer tube bridge arm 121 is connected to the second input end of the inner tube bridge arm 131 through the first conductive connector 14.

[0035] In this embodiment, the DC side includes a battery, a solar panel, etc.

[0036] More specifically, by connecting the second input terminal of the first external bridge arm 111 to the first input terminal of the second external bridge arm 121 to the DC_N input terminal, connecting the first input terminal of the first external bridge arm 111 to the DC_+ input terminal, connecting the second input terminal of the second external bridge arm 121 to the DC_- input terminal, connecting the output terminal of the first external bridge arm 111 to the first input terminal of the inner bridge arm 131 through the first conductive connector 14, and connecting the output terminal of the second external bridge arm 121 to the second input terminal of the inner bridge arm 131 through the first conductive connector 14, a three-level circuit is output to the first and second input terminals of the third power module 13.

[0037] Please see Figures 3 to 5 Furthermore, the input terminals of the first outer tube bridge arm 111 and the second outer tube bridge arm 121 are connected to the DC input terminals via DC multilayer copper busbar 16.

[0038] The DC multilayer copper busbar 16 includes a DC positive input terminal, a DC N-terminal input terminal, and a DC negative input terminal; The DC positive input terminal is connected to the DC_+ input terminal and the first input terminal of the first external tube bridge arm 111; The DC N-pole input terminal is connected to the DC_N input terminal, the second input terminal of the first external tube bridge arm 111, and the first input terminal of the second external tube bridge arm 121; The DC negative input terminal is connected to the DC- input terminal and the second input terminal of the second external tube bridge arm 121.

[0039] In this embodiment, the first outer tube bridge arm 111 and the second outer tube bridge arm 121 can be connected to each input terminal on the DC side through the DC multilayer copper busbar 16. Corresponding to each input terminal on the DC side, the DC multilayer copper busbar 16 is also provided with a DC positive input terminal, a DC N-pole input terminal and a DC negative input terminal, so as to achieve a one-to-one correspondence connection.

[0040] The DC multilayer copper busbar 16 not only enables DC power to be input into the power module 10, but also, by using flat and parallel conductors, effectively reduces self-inductance. Furthermore, when currents flow in opposite directions through the DC multilayer copper busbar 16, the generated magnetic field can be largely canceled out, thereby reducing parasitic mutual inductance. In addition, the structure of the DC multilayer copper busbar 16 increases the effective area of ​​the conductor, which can reduce resistance and impedance and improve current transmission efficiency.

[0041] Please see Figures 3 to 6 Furthermore, when multiple power modules 10 based on a three-level topology are connected in parallel: The first conductive connector 14 and the DC multilayer copper busbar 16 both span multiple power modules 10 based on three-level topology, and the second conductive connector 16 spans at least two-thirds of the multiple power modules 10 based on three-level topology. The DC multilayer copper busbar 16 and the second conductive connector 15 are located on opposite sides of the module; The first conductive connector 14 is located between the DC multilayer copper busbar 16 and the second conductive connector 15, and is offset from the second conductive connector 15.

[0042] In this embodiment, the individual power module 10 is in a relatively regular triangular shape, and the input and output terminals of the first power module 11 and the second power module 12 are located at their top and bottom ends, respectively. The two input terminals of the third power module 13 are located in the same horizontal direction and are perpendicular to the first power module 10 and the second power module 10. The output terminal of the third power module 13 is located in the same horizontal direction as the two input terminals and is located at its own horizontal end.

[0043] When multiple power modules 10 are connected in parallel, the power modules 10 exhibit a regular structural distribution. Specifically, the multiple input terminals of the multiple first power modules 11 / second power modules 12 are in the same horizontal direction, the multiple output terminals of the multiple first power modules 11 / second power modules 12 are in the same horizontal direction, and the multiple input terminals and multiple output terminals of the multiple third power modules 13 are in the same horizontal direction. Based on this: Multiple input terminals of multiple first power modules 11 / second power modules 12 can be uniformly connected through a DC multilayer copper busbar 16 spanning the power module 10. The DC multilayer copper busbar 16 includes three outwardly protruding first connection terminals, namely the DC positive input terminal, the DC N input terminal and the DC negative input terminal mentioned above, which are respectively connected to the DC_+ input terminal, the DC_N input terminal and the DC_- input terminal to realize the input of the DC side power module 10. Multiple output terminals of multiple first power modules 11 / second power modules 12 can be uniformly connected through a first conductive connector 14 spanning the power module 10. The first conductive connector 14 has multiple second connection terminals protruding towards the output terminals of the first power modules 11 / second power modules 12 on the side closest to the first power modules 11 / second power modules 12, and these second connection terminals are connected to the corresponding output terminals. The first conductive connector 14 also has multiple third connection terminals protruding towards the third power module 13 on the side closest to the third power module 13, and these third connection terminals extend to the corresponding third power module 13 and connect to the two input terminals on the corresponding third power module 13, thus realizing the connection between the multiple first power modules 11 and second power modules 12 and the multiple third power modules 13. Multiple output terminals of multiple third power modules 13 can be uniformly connected through a second conductive connector 15 that spans at least two-thirds (actually more than three-quarters) of the power module 10. The second conductive connector 15 has multiple protruding fourth connection terminals on the side near the first power module 11 and the second power module 12. These fourth connection terminals are connected to the multiple output terminals of the multiple third power modules 13 and are parallel to the multiple third connection terminals of the first conductive connector 14, so that the second conductive connector 15 and the first conductive connector 14 are staggered. On the other side of the second conductive connector 15, there is a fifth connection terminal that protrudes outward and is connected to the AC side.

[0044] The above describes how the DC-DC stacked copper busbar 16, the first conductive connector 14, and the second conductive connector 15 are connected to the DC side, the first power module 11 / second power module 12, the third power module 13, and the AC side, respectively, thus establishing a circuit structure from the DC side to the AC side.

[0045] At this time, the DC stacked copper busbar 16 and the second conductive connector 15 are located on opposite sides of the module, and the first conductive connector 14 is located between the DC stacked copper busbar 16 and the second conductive connector 15, and is offset from the second conductive connector 15. The structure of the DC stacked copper busbar 16, the first conductive connector 14 and the second conductive connector 15, as well as the overall structure of the multiple power modules 10 connected in parallel, are relatively neat and beautiful. This can reduce the use of conductive materials and facilitate the production and manufacturing of parts and the subsequent installation and disassembly of the multiple power modules 10 connected in parallel.

[0046] Please see Figure 6 Furthermore, the power module based on the three-level topology also includes a heat sink 17. The first power module 11, the second power module 12 and the third power module 13 are attached to the upper surface of the heat sink 17 through a thermally conductive component and fixed to the heat sink 17 by fasteners.

[0047] Optionally, the heat sink 17 may include, but is not limited to, an extruded profile heat sink 17, an aluminum heat sink 17, etc. Optionally, the thermal conductive component may include thermal grease, thermal adhesive, thermal pads, and thermal shims, etc. Optionally, screws, fixing adhesive, or other fasteners can be used to fix the power module to the heat sink 17.

[0048] In this embodiment, by setting up a heat sink 17 and attaching the first power module 11, the second power module 12, and the third power module 13 to the heat sink 17 using thermally conductive components, the heat generated by the power modules during operation can be dissipated through the heat sink 17 in a timely manner, ensuring operational reliability. Simultaneously, fasteners are used to secure each power module to the heat sink 17, ensuring the stability of the power module installation.

[0049] As one possible embodiment, please refer to Figure 6 As shown, for high-power applications, the power module 10 based on the three-level topology can be used in parallel, and the number of parallel modules can be selected according to the power requirements.

[0050] Figure 6 In this design, the connection between the three input terminals on the DC side and the three power modules 10, as well as the connection between the first power module 11, the second power module 12 and the third power module 13 in each power module 10, is simpler and uses less conductive connection material.

[0051] Moreover, the direct parallel connection can achieve higher output power levels within a smaller volume, which facilitates the layout of various electrical components in the design of the inverter 100, and is conducive to the miniaturization and integration of equipment manufacturing. At the same time, the connection method is more convenient, fewer conductive components are used, the size of the connection materials is reduced, and the cabinet structure size can be reduced accordingly, which is more conducive to reducing costs.

[0052] As one possible implementation, Figure 6 This implementation is based on three sets of power modules 10 connected in parallel. Each power module 10 includes multiple power modules, a DC multilayer copper busbar 16, a first conductive connector 14, a second conductive connector 15, and may also include a heat sink 17, which may be rectangular. The first power module 11, the second power module 12, and the third power module 13 in the three sets of power modules 10 can be attached to the surface of the heat sink 17 via thermally conductive components, which facilitates the timely dissipation of heat from the power modules through the heat sink 17 during operation.

[0053] Combination Figure 6 As shown, the first conductive connector 14 can be a stacked copper busbar connecting the outer tube and the inner tube, and the second conductive connector 15 can be an AC output copper busbar. The DC stacked copper busbar 16, the stacked copper busbar connecting the outer tube and the inner tube, and the AC output copper busbar can be connected to the corresponding input or output terminals of the bridge arms in the three power modules 10 by means of screw connection.

[0054] The DC multilayer copper busbar 16 is the DC power input of the power module 10, and is connected to the input terminals of the first outer tube bridge arm 111 and the second outer tube bridge arm 121 of each power module 10. The DC positive input terminal, DC N input terminal and DC negative input terminal of the DC multilayer copper busbar 16 are connected to the DC_+, DC_N and DC_- buses respectively. The multilayer copper busbar connecting the outer tube and the inner tube is responsible for connecting the outer tube output terminal and the inner tube input terminal of each power module 10. The AC output copper busbar is connected to the inner tube output terminal of each power module 10 and serves as the AC power output terminal of each power module 10.

[0055] It should be noted that, regardless of how many power modules 10 are connected in parallel, the connection method of a single power module 10 can be used as the basis to provide a DC multilayer copper busbar 16, a multilayer copper busbar with outer tube and inner tube connection, and an AC output copper busbar to be connected to the input and output terminals of each bridge arm respectively.

[0056] In this embodiment, only three sets of power modules 10 connected in parallel are used as an example for illustration.

[0057] Please see Figures 1 to 7 The inverter 100 of this utility model embodiment includes: DC switch 20, DC capacitor 30, inverter reactor 40, and AC switch 50; and According to any of the above-mentioned three-level topology-based power modules 10, DC switch 20 connects DC power supply to the input terminal of three-level topology-based power module 10, DC capacitor 30 is connected in parallel between DC switch 20 and the input terminal of three-level topology-based power module 10, the output terminal of three-level topology-based power module 10 is connected to the input terminal of inverter reactor 40, and AC switch 50 connects the output terminal of inverter reactor 40 to AC output terminal.

[0058] In the inverter 100 of this utility model embodiment, the two outer tube modules, the first power module 11 and the second power module 12, which have relatively high temperatures during the use of the power module 10, adopt Econo Dual 3 packaged modules with NTC thermistors. The third power module 13, which has relatively low temperatures, adopts a 62mm packaged module without NTC thermistors. Compared with the three-level ANPC circuit using a single package in the prior art, the power module 10 based on the three-level topology in this solution adopts a hybrid package, which retains the temperature detection function of the higher-temperature module while controlling costs, and ensures the electrical safety of the power module 10.

[0059] The inverter 100 can convert DC power into AC power for use in homes, businesses, and industries. In this embodiment, the inverter 100 includes a DC switch 20, a DC capacitor 30, and a power module 10 based on a three-level topology, all electrically connected in sequence. Figure 7 The power module 10), inverter reactor 40 and AC switch 50 are included, among which: The DC switch 20 can be used to connect or disconnect the inverter 100 from the DC input power supply. When in the open position, the contacts have an insulation distance that meets the specified requirements and play an isolation role. When in the closed position, it can carry the current under normal circuit conditions and the short-circuit current for a short time. The DC capacitor 30 can be used to stabilize the DC side voltage, buffer the instantaneous energy exchange during the switching process between the DC and AC sides of the inverter 100, effectively suppress the fluctuation of the DC side voltage, and ensure the stability of the AC output voltage. The power module 10 can convert DC power into AC power to meet the AC power requirements of different electrical appliances; Inverter reactor 40 is used to form a filter circuit to smooth the output waveform of inverter 100, reduce voltage and current harmonic content, and make the output waveform close to an ideal sine wave to meet the needs of the power grid or load. The AC switch 50 is used to connect or disconnect the inverter 100 from the AC power grid or load. If a circuit breaker is used, it can also realize the overload and short circuit protection function of the inverter 100, protect the safety of the inverter 100 and the connected equipment, and reduce the expansion of the fault range.

[0060] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power module based on a three-level topology, characterized in that, include: A first power module is vertically disposed on one side of the module, the first power module including a first outer tube bridge arm; A second power module is arranged side-by-side with the first power module. The second power module includes a second external bridge arm, and the input terminals of both the first and second external bridge arms are connected to a DC input terminal. A third power module, which is arranged in parallel to the first power module and the second power module on the other side of the module, includes an inner tube bridge arm. The output ends of the first outer tube bridge arm and the second outer tube bridge arm are connected to the input end of the inner tube bridge arm. The output end of the inner tube bridge arm is connected to the AC side. The first power module and the second power module are Econo DUAL 3 package modules, and the third power module is a 62mm package module.

2. The power module based on a three-level topology according to claim 1, characterized in that, The output end of the first outer tube bridge arm and the output end of the second outer tube bridge arm are connected to the input end of the inner tube bridge arm through a first conductive connector; The output end of the inner tube bridge arm is connected to the AC side via a second conductive connector.

3. The power module based on a three-level topology according to claim 2, characterized in that, The DC input terminals include a DC-+ input terminal, a DC-N input terminal, and a DC-- input terminal on the DC side; The second input terminal of the first outer tube bridge arm is connected to the first input terminal of the second outer tube bridge arm and the DC_N input terminal; The first input terminal of the first outer tube bridge arm is connected to the DC_+ input terminal; The second input terminal of the second outer tube bridge arm is connected to the DC-input terminal; The output end of the first outer tube bridge arm is connected to the first input end of the inner tube bridge arm through the first conductive connector. The output end of the second outer tube bridge arm is connected to the second input end of the inner tube bridge arm through the first conductive connector.

4. The power module based on a three-level topology according to claim 3, characterized in that, The input terminal of the first outer tube bridge arm and the input terminal of the second outer tube bridge arm are connected to the DC input terminal via a DC multilayer copper busbar.

5. The power module based on a three-level topology according to claim 4, characterized in that, The DC multilayer copper busbar includes a DC positive input terminal, a DC N-terminal input terminal, and a DC negative input terminal; The DC positive input terminal is connected to the DC_+ input terminal and the first input terminal of the first external tube bridge arm; The DC N-pole input terminal is connected to the DC_N input terminal, the second input terminal of the first external tube bridge arm, and the first input terminal of the second external tube bridge arm. The DC negative input terminal is connected to the DC- input terminal and the second input terminal of the second external tube bridge arm.

6. The power module based on a three-level topology according to claim 4 or 5, characterized in that, When multiple power modules based on the three-level topology are connected in parallel, the first conductive connector and the DC multilayer copper busbar both span across the multiple power modules based on the three-level topology, and the second conductive connector spans at least two-thirds of the multiple power modules based on the three-level topology.

7. The power module based on a three-level topology according to claim 6, characterized in that, The DC stacked copper busbar and the second conductive connector are located on opposite sides of the module; The first conductive connector is located between the DC stacked copper busbar and the second conductive connector, and is offset from the second conductive connector.

8. The power module based on a three-level topology according to claim 2, characterized in that, The first conductive connector includes any one of the following for electrically connecting the inner tube bridge arm, the first outer tube bridge arm, and the second outer tube bridge arm: a stacked copper busbar, a copper strip, a cable, and a stacked busbar. The second conductive connector includes any one of the following for electrically connecting the inner tube bridge arm and the AC side: a stacked copper busbar, a copper strip, a cable, and a stacked busbar.

9. The power module based on a three-level topology according to claim 1, characterized in that, The power module based on the three-level topology also includes a heat sink. The first power module, the second power module and the third power module are attached to the upper surface of the heat sink through a thermally conductive component and fixed to the heat sink by fasteners.

10. An inverter, characterized in that, include: DC switches, DC capacitors, inverter reactors, and AC switches; as well as According to any one of claims 1 to 9, the power module based on a three-level topology is wherein the DC switch is connected to the DC power supply and the input terminal of the power module based on the three-level topology, the DC capacitor is connected in parallel between the DC switch and the input terminal of the power module based on the three-level topology, the output terminal of the power module based on the three-level topology is connected to the input terminal of the inverter reactor, and the AC switch is connected between the output terminal of the inverter reactor and the AC output terminal.

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