Three-level topology power module and inverter

Abstract

The utility model is applicable to the technical field of inverter control, and provides a three-level topology power module and an inverter, comprising a first power module, a second power module and a third power module which are respectively provided with a control terminal, and the first power module and the second power module are arranged in the same direction. The third power module is arranged in a reverse direction relative to the first power module and the second power module, and the first power module, the second power module and the third power module are arranged in a linear manner; the input ends of the first power module and the second power module are connected with a direct current input end, the output ends of the first power module and the second power module are connected with the input end of the third power module through alternating current conductive connecting pieces, and the output end of the third power module is led out based on the alternating current conductive connecting pieces to be connected with an alternating current side. According to the invention, the occupied space of the power module can be reduced, the use of conductive materials is reduced, the miniaturization of equipment manufacturing is facilitated, the cost is saved, and the installation mode is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of inverter control, and particularly relates to a three-level topology power module and an inverter. Background Art

[0002] With the rapid development of energy technology, power electronics technology is increasingly widely used in the field of medium and high voltage and high power. In this field, multilevel topology structures have been widely studied and applied due to their significant advantages such as low harmonic content and high efficiency. Among them, the three-level circuit topology has attracted much attention due to its relatively simple structure and excellent performance.

[0003] The three-level circuit topology can be built with half-bridge modules. The three-level ANPC (Active Neutral Point Clamped) circuit topology is as Figure 1 shown. The existing three-level circuit unit can be composed of three half-bridge modules arranged in a triangular pyramid shape and then combined into a parallel module, as Figure 2 shown. However, due to the structural characteristics of the triangular pyramid arrangement, the power module appears relatively loose in the overall layout, and the limited space resources cannot be fully utilized. This not only leads to an increase in the overall volume of the power module, but also brings inconvenience to the installation, maintenance, and production of the equipment. In addition, due to the increase in the volume of the power module, the size of the conductive materials required for the connection between modules also increases accordingly. As the copper bar is an important conductive component in power electronic equipment, the increase in its size not only increases the manufacturing cost of the equipment, but also when more copper bars are used as conductive components, there will be complex installation and even affect the reliability of the equipment. It can be seen that the existing three-level circuit topology not only has the problem that the power module has a large volume and is not conducive to the miniaturization of the equipment, but also has the problem of high cost due to the large size and large amount of conductive components required. Summary of the Utility Model

[0004] The utility model provides a three-level topology power module, aiming to solve the problems in the prior art that due to the triangular pyramid arrangement of the three-level circuit topology, the power module has a large volume and is not conducive to the miniaturization of the equipment, and the required conductive components have a large size, a large amount of materials, high cost, and complex installation.

[0005] The utility model is implemented as follows. In the first aspect, a three-level topology power module is provided. A three-level topology power module includes a first power module, a second power module, and a third power module respectively provided with control terminals. The first power module and the second power module are arranged in the same direction, the third power module is arranged in the opposite direction relative to the first power module and the second power module, and the first power module, the second power module, and the third power module are arranged in a straight line.

[0006] The input ends of the first power module and the second power module are connected to a DC input end, and the output ends of the first power module and the second power module are connected to the input end of the third power module through an AC conductive connection member. Meanwhile, the output end of the third power module is led out based on the AC conductive connection member and connected to the AC side.

[0007] Further, the first power module includes a first outer tube bridge arm, the second power module includes a second outer tube bridge arm, the third power module includes an inner tube bridge arm. The input end of the first outer tube bridge arm and the input end of the second outer tube bridge arm are connected to the DC input end. 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 based on the AC conductive connection member. The output end of the inner tube bridge arm is led out through the AC conductive connection member.

[0008] Further, the DC input end includes a DC_+ input end, a DC_N input end, and a DC_- input end on the DC side. The first input end of the first outer tube bridge arm is connected to the DC_+ input end. The second input end of the first outer tube bridge arm and the first input end of the second outer tube bridge arm are connected to the DC_N input end. The second input end of the second outer tube bridge arm is connected to the DC_- input end. The output end of the first outer tube bridge arm is connected to the first input end of the inner tube bridge arm based on the AC conductive connection member. The output end of the second outer tube bridge arm is connected to the second input end of the inner tube bridge arm based on the AC conductive connection member.

[0009] Further, the input ends of the first outer tube bridge arm and the second outer tube bridge arm are connected to the DC input end through a DC conductive connection member. The DC conductive connection member includes a DC positive input end, a DC N input end, and a DC negative input end. The DC positive input end is connected to the DC_+ input end and the first input end of the first outer tube bridge arm. The DC N input end is connected to the DC_N input end, the first input end of the second outer tube bridge arm, and the second input end of the first outer tube bridge arm. The DC negative input end is connected to the DC_- input end and the first input end of the second outer tube bridge arm.

[0010] Further, the AC conductive connection member includes any one of a laminated copper busbar, a copper bar, a cable, and a stacked busbar for electrically connecting the first outer tube bridge arm, the second outer tube bridge arm, the inner tube bridge arm, and the AC side.

[0011] Further, the DC conductive connection member includes any one of a laminated copper busbar, a copper bar, a cable, and a stacked busbar for electrically connecting a DC power supply to the first outer tube bridge arm and the second outer tube bridge arm.

[0012] Further, it further includes a radiator, and the first power module, the second power module, and the third power module are attached to the radiator based on a heat conducting member and fixed to the radiator through a fixing member.

[0013] Further, the AC conductive connecting member has a Y-shaped structure.

[0014] Further, one end of the DC conductive connecting member faces into the receiving groove of the DC conductive connecting member, and the other end extends out a DC positive input terminal, a DC N-pole input terminal, and a DC negative input terminal toward the first edge of the radiator. The AC conductive connecting member extends out an AC output terminal on one side close to the second edge of the radiator, wherein the first edge and the second edge are oppositely arranged.

[0015] In a second aspect, an inverter is further provided, which includes a DC switch, a DC capacitor, an inverter reactor, and an AC switch, and further includes a three-level topology power module group as described in the first aspect. The DC switch is connected to the input terminal of a three-level topology power module group by a DC power supply, the DC capacitor is connected in parallel between the DC switch and the input terminal of a three-level topology power module group, the output terminal of a three-level topology power module group is connected to the input terminal of the inverter reactor, and the AC switch is connected to the output terminal of the inverter reactor and the AC output terminal.

[0016] The beneficial effects achieved by the present utility model are as follows: By arranging the first power module and the second power module in the same direction, and arranging the third power module in the opposite direction relative to the first power module and the second power module, and arranging the first power module, the second power module, and the third power module in a linear arrangement, compared with the arrangement in a triangular pyramid shape, the arrangement of each power module provided in this application is more compact, occupies less space, is more conducive to the miniaturization of equipment manufacturing. At the same time, the more compact arrangement will also reduce the size of the connecting materials, thereby reducing the size of the inverter cabinet structure, and thus reducing the equipment cost. In addition, through an AC conductive connecting member, not only the output terminals of the first power module and the second power module are electrically connected to the input terminal of the third power module, but also the output terminal of the third power module is led out and connected to the AC side, thereby realizing the output of converting direct current to alternating current, and the installation method is more convenient. Description of the Drawings

[0017] Figure 1 It is a topology diagram of a three-level inverter topology circuit provided by the prior art;

[0018] Figure 2 It is a circuit connection schematic diagram of a three-level circuit unit provided by the prior art;

[0019] Figure 3 It is a schematic diagram of a three-level topology power module group provided by an embodiment of the present utility model;

[0020] Figure 4 Another schematic diagram of a three-level topology power module provided by an embodiment of the present utility model;

[0021] Figure 5 Another schematic diagram of a three-level topology power module provided by an embodiment of the present utility model;

[0022] Figure 6 A module schematic diagram of an inverter provided by an embodiment of the present utility model.

[0023] Wherein, 1 is the first power module, 11 is the first outer tube bridge arm, 2 is the second power module, 21 is the second outer tube bridge arm, 3 is the third power module, 31 is the inner tube bridge arm, 4 is the AC conductive connection member, 5 is the DC conductive connection member, 6 is the radiator, 61 is the first edge, 62 is the second edge, 7 is the fixing member, 8 is the inverter, 81 is the DC switch, 82 is the DC capacitor, 83 is the inverter reactor, 84 is the AC switch, and 85 is the power module. Specific embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] In this application, the first power module and the second power module are arranged in the same direction, the third power module is arranged in the opposite direction relative to the first power module and the second power module, and the first power module, the second power module and the third power module are arranged in a straight line. Compared with the arrangement in a triangular pyramid shape, the arrangement of each power module provided by this application is more compact, occupies less space, is more conducive to the miniaturization of equipment manufacturing. At the same time, the more compact arrangement will also reduce the size of the connection materials, thereby reducing the size of the inverter cabinet structure, and thus reducing the equipment cost; in addition, through an AC conductive connection member 4, not only the output ends of the first power module 1 and the second power module 2 are electrically connected to the input end of the third power module 3, but also the output end of the third power module 3 is led out and connected to the AC side, so as to realize the output of DC to AC, and the installation method is more convenient.

[0026] Example 1

[0027] Combined with Figure 3 and Figure 4As shown in the figure, an embodiment of the present utility model provides a three-level topology power module, which includes a first power module 1, a second power module 2, and a third power module 3 respectively provided with control terminals. The first power module 1 and the second power module 2 are arranged in the same direction, the third power module 3 is arranged in the opposite direction relative to the first power module 1 and the second power module 2, and the first power module 1, the second power module 2, and the third power module 3 are arranged in a straight line;

[0028] The input ends of the first power module 1 and the second power module 2 are connected to a DC input end, and the output ends of the first power module 1 and the second power module 2 are connected to the input end of the third power module 3 through an AC conductive connection member 4.

[0029] Specifically, each power module can include three power modules of the same type and size, namely the first power module 1, the second power module 2, and the third power module 3. Among them, a control terminal is provided on one side of each power module close to the input end. The control terminal can be used to control the working state of the power module, and each power module can use a 62mm packaging method.

[0030] More specifically, the first power module 1, the second power module 2, and the third power module 3 are arranged on the same horizontal plane, and the first power module 1 and the second power module 2 are arranged in the same direction, that is, the control terminals face the same direction; at the same time, the third power module 3 is arranged in the opposite direction relative to the first power module 1 and the second power module 2, that is, the control terminal of the third power module 3 faces the opposite direction to the control terminals of the first power module 1 and the second power module 2. The third power module 3 can be obtained by rotating the first or second power module 2 by 180 degrees. The first power module 1, the second power module 2, and the third power module 3 are arranged side by side in the same horizontal direction and are arranged in a straight line. The distance between each power module can be equal.

[0031] More specifically, in combination with Figure 2As shown, compared with the arrangement of the Chinese character "品" which requires each power module to be placed vertically, based on the above arrangement provided in this embodiment, by connecting the input ends of the first power module 1 and the second power module 2 to the DC input end, and connecting the output end to the input end of the third power module 3 through the AC conductive connector 4, and at the same time, connecting the output end of the third power module 3 to the AC side based on the AC conductive connector 4, the DC side power energy is converted to the AC side output based on the three power modules, which can not only reduce the occupied space of a single power module. In addition, based on the same AC conductive connector 4, the first power module 1, the second power module 2 and the third power module 3 are connected, and the output end of the third power module 3 is connected to the AC side. Compared with the connection between the power modules and the connection between the power modules and the AC side, the installation method that requires the connection of conductive elements is more convenient, and the conductive elements used will be less, which is conducive to reducing costs and is more conducive to miniaturization of equipment.

[0032] In order to better illustrate the effect of reducing space occupation by a three-level topology power module provided in this embodiment, Figure 2 , Figure 3 As shown, when the setting gap L of each functional module is the same and is 5mm, and the length × width of a single power module is 106.4mm×61.4mm, a single power module of the herringbone arrangement structure needs to occupy the width of two power modules and a gap L in the width (horizontal direction), and the length of two power modules plus a gap L in the length (vertical direction). At the same time, the control end of the functional module directly connected to the AC side is away from the power module connected to the DC side; but based on the setting method of the three power modules in this embodiment, the width occupies the width of three power modules and two gaps L, and the length occupies the length of one power module. If the occupied area is determined by the area, the area occupied by the herringbone arrangement is (5+61.4×2)×(5+106.4×2)=27834.84mm, and the area occupied by the setting method provided in this embodiment is (61.4×3+5+5)×106.4=20666.88mm. It can be seen that the arrangement of each power module provided in this embodiment is more compact, which can reduce space occupancy compared to the herringbone arrangement, and is more conducive to miniaturization of the equipment. A more compact arrangement can also reduce the use of conductive elements, especially when there are multiple power modules in parallel, and can also simplify the connection method.

[0033] More specifically, combined Figure 4As shown, when the third power module 3 is electrically connected to the first power module 1 and the second power module 2, conductive connection can be achieved through the AC conductive connector 4, so as to output the electric energy output from the DC side to the first power module 1 and the second power module 2 to the third power module 3. The third power module 3 is also electrically connected to the AC side based on the AC conductive connector 4, and finally, the electric energy is output to the AC side through the third power module 3 to output electric energy to the load on the AC side. Among them, the AC conductive connector 4 includes any one of laminated copper bars, copper strips, cables and stacked busbars for electrically connecting the first outer tube bridge arm 11, the second outer tube bridge arm 21, the inner tube bridge arm 31 and the AC side. In this embodiment, the AC conductive connector 4 is an AC laminated copper bar.

[0034] In the embodiment of the present utility model, by arranging the first power module 1 and the second power module 2 in the same direction, and arranging the third power module 3 in the opposite direction relative to the first power module 1 and the second power module 2, and arranging the first power module 1, the second power module 2 and the third power module 3 in a straight line arrangement. Compared with the triangular arrangement, the arrangement of each power module provided in this application is more compact, occupies less space, is more conducive to the miniaturization of equipment manufacturing. At the same time, the more compact arrangement will also reduce the size of the connection materials, and then reduce the size of the inverter cabinet structure, thereby reducing the equipment cost; in addition, through an AC conductive connector 4, not only the output ends of the first power module 1 and the second power module 2 are electrically connected to the input end of the third power module 3, but also the output end of the third power module 3 is led out and connected to the AC side, so as to realize the output of DC to AC, and the installation method is more convenient.

[0035] Example 2

[0036] Combined with Figure 1 and Figure 3 As shown, in this embodiment, the first power module 1 includes a first outer tube bridge arm 11, the second power module 2 includes a second outer tube bridge arm 21, the third power module 3 includes an inner tube bridge arm 31. The input ends of the first outer tube bridge arm 11 and the second outer tube bridge arm 21 are connected to the DC input end. The output end of the first outer tube bridge arm 11 and the output end of the second outer tube bridge arm 21 are connected to the input end of the inner tube bridge arm 31 based on the AC conductive connector 4, and the output end of the inner tube bridge arm 31 is led out through the AC conductive connector 4.

[0037] The DC input terminal includes a DC_+ input terminal, a DC_N input terminal, and a DC_- input terminal on the DC side. The first input terminal of the first outer tube bridge arm 11 is connected to the DC_+ input terminal. The second input terminal of the first outer tube bridge arm 11 and the first input terminal of the second outer tube bridge arm 21 are connected to the DC_N input terminal. The second input terminal of the second outer tube bridge arm 21 is connected to the DC_- input terminal. The output terminal of the first outer tube bridge arm 11 is connected to the first input terminal of the inner tube bridge arm 31 based on the AC conductive connection member 4. The output terminal of the second outer tube bridge arm 21 is connected to the second input terminal of the inner tube bridge arm 31 based on the AC conductive connection member 4.

[0038] Specifically, the device providing DC power on the DC side can include a storage battery, a solar panel, etc. The above-mentioned first power module 1 can include the first outer tube bridge arm 11 of a three-level ANPC circuit, corresponding to Figure 1 the upper tubes T1 and T5 in Figure 1 . The second power module 2 is the second outer tube bridge arm 21, corresponding to Figure 1 the lower tubes T4 and T6 in

[0039] . Of course, the positions of the upper tubes and lower tubes corresponding to the first power module 1 and the second power module 2 can be exchanged, that is, the first outer tube bridge arm 11 is corresponding to the second power module 2, and the second outer tube bridge arm 21 is corresponding to the first power module 1. The third power module 3 can be the inner tube bridge arm 31 of a three-level ANPC circuit, corresponding to Figure 1 T2 and T3 in

[0039] .

[0040] In this embodiment, based on the arrangement of each power module in the above embodiment, by connecting the input ends of the first outer tube bridge arm 11 and the second outer tube bridge arm 21 to the DC_+ input end, DC_N input end, and DC_- input end of the DC side correspondingly, and realizing the connection between the inner and outer tube bridge arms through the AC conductive connector 4 while connecting the inner tube to the AC side, not only the electric energy on the DC side is converted and output to the AC side, but also it is more convenient compared to the installation method where conductive elements are required for the connection between power modules and the connection between power modules and the AC side respectively, and relatively fewer conductive elements are used, which is more conducive to the miniaturization of the device.

[0041] Example 3

[0042] Combined with Figure 4 As shown, in this embodiment, the input ends of the first outer tube bridge arm 11 and the second outer tube bridge arm 21 are connected to the DC input end through the DC conductive connector 5. The DC conductive connector 5 includes a DC positive input end, a DC N-pole input end, and a DC negative input end. The DC positive input end connects the DC_+ input end to the first input end of the first outer tube bridge arm 11. The DC N-pole input end connects the DC_N input end, the first input end of the second outer tube bridge arm 21, and the second input end of the first outer tube bridge arm 11. The DC negative input end connects the DC_- input end and the first input end of the second outer tube bridge arm 21.

[0043] Specifically, the above DC conductive connector 5 includes any one of a laminated copper busbar, a copper bar, a cable, and a stacked busbar for electrically connecting the DC power supply to the first outer tube bridge arm 11 and the second outer tube bridge arm 21. In this embodiment, the DC conductive connector 5 is a DC laminated copper busbar. The first outer tube bridge arm 11 and the second outer tube bridge arm 21 are connected to each input end of the DC side through the DC laminated copper busbar. And corresponding to each input end of the DC side, a DC positive input end, a DC N-pole input end, and a DC negative input end are correspondingly arranged on the DC laminated copper busbar to achieve one-to-one connection, thereby realizing the input of direct current. Moreover, the laminated copper busbar adopts flat and parallel conductors, which can effectively reduce self-inductance. At the same time, when currents flowing in opposite directions pass through the laminated copper plates, the generated magnetic fields can be largely offset, thereby reducing parasitic mutual inductance. In addition, the structure of the laminated copper busbar increases the effective area of the conductor, can reduce resistance and impedance, and improve the current transmission efficiency.

[0044] Example 4

[0045] Combined with Figure 4 Figure 5As shown, in this embodiment, the power module further includes a heat sink 6. The first power module 1, the second power module 2, and the third power module 3 are attached to the heat sink 6 based on a heat conducting member and fixed to the heat sink 6 based on a fixing member 7.

[0046] Specifically, in combination with Figure 5 As shown, as a possible implementation manner, for high-power applications, a three-level topology power module can be used in parallel, and the number of parallel modules can be selected according to the power requirement. Figure 5 In, the connection manner of the three input terminals on the DC side to the two power modules and the connection manner between the third power modules 3 in each power module are simpler than the delta connection manner, and less conductive connection material is used; and the direct parallel connection form can achieve a higher output power level within a smaller volume range. Moreover, since the single power module provided in this embodiment occupies a small space, even if multiple modules are used in parallel, the occupied space is smaller than that of the delta structure, which is more convenient for the layout of each electrical component during the design of the inverter, is beneficial to the miniaturization of equipment manufacturing, and at the same time, the connection manner is more convenient, less conductive elements are used, the size of the connection material is reduced, and correspondingly, the size of the cabinet structure can be reduced, so it is more beneficial to reduce costs.

[0047] As a possible implementation manner, Figure 4 This is an implementation manner provided based on the parallel connection of two power modules. Among them, for a single power module, in addition to including multiple power modules, a DC conductive connection member 5, and an AC conductive connection member 4, it also includes a heat sink 6, and the heat sink 6 is placed in a rectangular shape under each power module. In Figure 4 In, the above-mentioned AC conductive connection member 4 is an AC laminated copper busbar, the second conductive connection member is an AC output copper busbar, and the DC laminated copper busbar and the AC laminated copper busbar can be connected to the corresponding input terminals or output terminals of the bridge arms in the two power modules respectively by means of screw connection. Among them, the DC laminated copper busbar is the input of the DC electric energy of the power module and is connected to the input terminals of the first outer tube bridge arm 11 and the second outer tube bridge arm 21 of each power module. The DC positive input terminal, the DC N input terminal, and the DC negative input terminal of the DC laminated copper busbar are correspondingly connected to the DC_+, DC_N, and DC_- buses; the AC laminated copper busbar is responsible for connecting the outer tube output terminals and the inner tube input terminals of each power module and collecting the inner tube output terminals of each power module, and outputs as the AC electric energy output terminal of each power module.

[0048] Among them, the above-mentioned radiator 6 may include, but is not limited to, an extruded profile radiator 6, an aluminum radiator 6, etc. The above-mentioned heat-conducting member may include thermal grease, thermal adhesive, thermal pad, thermal gasket, etc. The first power module 1, the second power module 2, and the third power module 3 in the two groups of power modules may be respectively attached to the surface of the radiator 6 through the heat-conducting member, which is beneficial to the heat of the power module being dissipated in time through the radiator 6 during operation. Among them, a connecting member may be used to fix the power module on the radiator 6, and the connecting member includes screws, fixing glue, etc.

[0049] It should be noted that regardless of the number of power modules connected in parallel, based on the connection method of a single power module, a DC laminated copper busbar and an AC laminated copper busbar can be provided to be respectively connected to the input end and the output end of each arm. In this embodiment, only two groups of power modules connected in parallel are taken as an example for illustration.

[0050] In this embodiment, by providing it to the radiator 6 and attaching the first power module 1, the second power module 2, and the third power module 3 to the radiator 6 based on the heat-conducting member, it is beneficial to the heat of the power module being dissipated in time through the radiator 6 during operation, ensuring the working reliability. At the same time, each power module is fixed to the radiator 6 through the fixing member 7 to ensure the installation stability of the power module.

[0051] Example 5

[0052] Such as Figure 4 As shown, in this embodiment, the AC conductive connecting member 4 has a Y-shaped structure; one end of the DC conductive connecting member 5 faces the receiving groove of the DC conductive connecting member 5, and the other end extends out a DC positive input terminal, a DC N-pole input terminal, and a DC negative input terminal toward the first edge 61 of the radiator 6, and the AC conductive connecting member 4 extends out an AC output terminal near the second edge 62 of the radiator 6, wherein the first edge 61 and the second edge 62 are oppositely arranged.

[0053] Specifically, the AC conductive connecting member 4 may have a Y-shaped structure and form a receiving groove. Whether it is a single group of power modules or multiple groups of power modules connected in parallel, it can not only realize the electrical connection between the inner tube arm 31 and the outer tube arm of the power module, but also when the DC laminated copper busbar is connected to each outer tube arm of each power module, a part of the DC laminated copper busbar can be received in the receiving groove of the AC conductive connecting member 4, saving the occupied space to a greater extent. The other side of the DC laminated copper busbar extends out each input terminal toward the first edge 61 of the radiator 6, and it will not occupy a larger space either.

[0054] In addition, the AC conductive connection member 4 is arranged in a Y-shaped structure. The part extending from the bottom to one side of the second edge 62 of the radiator 6 will serve as the output end of the inner tube bridge arm 31 and the AC output end of the AC side conduction. The conductive elements required for electrically connecting between the bridge arms and the conductive elements required for electrically connecting between the bridge arm and the AC output are simultaneously realized through the integrally formed AC conductive connection member 4, making the installation more convenient.

[0055] Example 6

[0056] Combined with Figure 6 As shown, in this embodiment, an inverter is provided, which includes a DC switch 81, a DC capacitor 82, an inverter reactor 83, an AC switch 84, and a three-level topology power module in any one of the above embodiments. The DC switch 81 is connected to the DC power supply and the input end of a three-level topology power module. The DC capacitor 82 is connected in parallel between the DC switch 81 and the input end of a three-level topology power module. The output end of a three-level topology power module is connected to the input end of the inverter reactor 83. The AC switch 84 is connected to the output end of the inverter reactor 83 and the AC output end.

[0057] Specifically, the inverter 8 includes a DC switch 81, a DC capacitor 82, a three-level topology power module ( Figure 6 the power module 85 therein), an inverter reactor 83, and an AC switch 84 that are electrically connected in sequence. Through the inverter 8, the DC power supply can be converted into an AC power supply for use in households, commercial and industrial occasions, etc. Among them, the DC switch 81 can be used to control the switching state of the DC voltage to ensure that the DC voltage output by the inverter 8 is within a stable range. When the input voltage of the inverter 8 changes, the DC switch 81 will automatically adjust the magnitude of the output current to maintain current stability. The DC capacitor 82 can be used to stabilize the DC side voltage, buffer the instantaneous energy exchange during the switching processes on the DC side and the AC side of the inverter 8, effectively suppress the voltage fluctuation on the DC side, and ensure the stability of the AC output voltage. The power module 85 can convert direct current into alternating current to meet the requirements of different electrical equipment for alternating current. The inverter reactor 83 is used for current limiting to prevent damage to other components due to excessive current when a fault occurs in the internal circuit of the inverter 8. The AC switch 84 is used to control the switching state of the alternating current to ensure that the alternating current output by the inverter 8 meets the equipment requirements. In the inverter 8 circuit, the AC switch 84 may be used to control the on / off of the AC output, protect the equipment from damage, or adjust the output waveform, etc.

[0058] In this embodiment, for the three-level topology power module provided in the above embodiment, compared with the arrangement structure of the triangular arrangement, the first power module 1 and the second power module 2 are arranged in the same direction, the third power module 3 is arranged in the opposite direction to the first power module 1 and the second power module 2, and the first power module 1, the second power module 2 and the third power module 3 are arranged in a linear arrangement. Compared with the triangular arrangement, the arrangement of each power module provided in this application is more compact, occupies less space, is more conducive to the miniaturization of equipment manufacturing. At the same time, the more compact arrangement will also reduce the size of the connection material, and then reduce the size of the inverter 8 cabinet structure, thereby reducing the equipment cost; in addition, through an AC conductive connection member 4, not only the output ends of the first power module 1 and the second power module 2 are electrically connected to the input end of the third power module 3, but also the output end of the third power module 3 is led out and connected to the AC side, so as to realize the output of DC to AC, and the installation method is more convenient. Therefore, the inverter 8 provided in this embodiment can also achieve the above-mentioned various embodiments and reach the corresponding effects, which will not be elaborated here.

[0059] The terms "first", "second", etc. in the specification and claims of the present invention or in the above drawings are used to distinguish different objects, rather than to describe a specific order. The mention of "embodiment" in this article means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0060] It should be understood that in the present invention, "a plurality of" means two or more. "And / or" is only a variable relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. "Including A, B, and C" and "including A, B, C" mean that all of A, B, and C are included. "Including A, B, or C" means including any one of A, B, and C. "Including A, B, and / or C" means including any one or any two or all three of A, B, and C.

[0061] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-level topology power module, comprising a first power module, a second power module and a third power module, each of which is provided with a control terminal, wherein: The first power module and the second power module are arranged in the same direction, the third power module is arranged in the opposite direction relative to the first power module and the second power module, and the first power module, the second power module and the third power module are arranged in a straight line; The input ends of the first power module and the second power module are connected to the DC input end, and the output ends of the first power module and the second power module are connected to the input end of the third power module through an AC conductive connector. At the same time, the output end of the third power module is connected to the AC side based on the AC conductive connector.

2. A three-level topology power module according to claim 1, characterized in that: The first power module includes a first outer tube bridge arm, the second power module includes a second outer tube bridge arm, and the third power module includes an inner tube bridge arm. The input end of the first outer tube bridge arm and the input end of the second outer tube bridge arm are connected to a DC input end, 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 based on the AC conductive connector, and the output end of the inner tube bridge arm is led out through the AC conductive connector.

3. A three-level topology power module according to claim 2, characterized in that: The DC input end includes a DC_+ input end, a DC_N input end and a DC_- input end on the DC side, the first input end of the first outer tube bridge arm is connected to the DC_+ input end, the second input end of the first outer tube bridge arm and the first input end of the second outer tube bridge arm are connected to the DC_N input end, the second input end of the second outer tube bridge arm is connected to the DC_- input end, the output end of the first outer tube bridge arm is connected to the first input end of the inner tube bridge arm based on the AC conductive connecting piece, and the output end of the second outer tube bridge arm is connected to the second input end of the inner tube bridge arm based on the AC conductive connecting piece.

4. A three-level topology power module according to claim 3, characterized in that: The input ends of the first outer tube bridge arm and the second outer tube bridge arm are connected to the DC input end through a DC conductive connector, and the DC conductive connector includes a DC positive input end, a DC N-pole input end and a DC negative input end. The DC positive input end is connected to the DC_+ input end and the first input end of the first outer tube bridge arm, the DC N-pole input end is connected to the DC_N input end, the first input end of the second outer tube bridge arm and the second input end of the first outer tube bridge arm, and the DC negative input end is connected to the DC_- input end and the first input end of the second outer tube bridge arm.

5. A three-level topology power module according to claim 3, characterized in that: The AC conductive connector includes any one of a laminated copper busbar, a copper strip, a cable and a laminated busbar for electrically connecting the first outer tube bridge arm, the second outer tube bridge arm, the inner tube bridge arm and the AC side.

6. A three-level topology power module according to claim 4, characterized in that: The DC conductive connector includes any one of a laminated copper busbar, a copper strip, a cable and a laminated busbar for electrically connecting the DC power supply with the first outer tube bridge arm and the second outer tube bridge arm.

7. A three-level topology power module according to claim 4, characterized in that: It also includes a heat sink, and the first power module, the second power module and the third power module are attached to the heat sink based on the heat conducting member and are fixed on the heat sink through a fixing member.

8. A three-level topology power module according to claim 7, characterized in that: The AC conductive connecting piece is in a Y-shaped structure.

9. A three-level topology power module according to claim 8, characterized in that: One end of the DC conductive connector faces the receiving groove of the DC conductive connector, and the other end extends to the first edge of the heat sink to form a DC positive input terminal, a DC N-pole input terminal and a DC negative input terminal, and the AC conductive connector extends an AC output terminal on the side close to the second edge of the heat sink, wherein the first edge and the second edge are arranged opposite to each other.

10. An inverter, comprising a DC switch, a DC capacitor, an inverter reactor and an AC switch, characterized in that: It also includes a three-level topology power module as described in any one of claims 1 to 9, the DC switch connects a DC power supply and an input end of a three-level topology power module, the DC capacitor is connected in parallel between the DC switch and the input end of a three-level topology power module, the output end of a three-level topology power module is connected to the input end of the inverter reactor, and the AC switch connects the output end of the inverter reactor and the AC output end.

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