Power module based on three-level topology and inverter

Abstract

The utility model relates to the technical field of inverter control, in particular to a three-level topology-based power module and an inverter, which comprise 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 vertically arranged relative to the first power module and the second power module in the same horizontal direction, and a control terminal of the third power module faces the second power module; the input end of the first power module and the input end of the second power module are connected with the direct current input end, the output end of the first power module and the output end of the second power module are connected with the input end of the third power module based on the first conductive connecting piece, and the output end of the third power module is connected to the alternating current side based on the second conductive connecting piece. Compared with the traditional arrangement in a shape like a Chinese character'pin ', the space occupation is smaller, the use of conductive elements is less, the miniaturization of equipment manufacturing is more facilitated, and the manufacturing cost is reduced.

Description

Technical Field

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

[0002] With the rapid development of energy technology, power electronics technology is increasingly widely used in the fields of medium and high voltage and high power. In this field, multi-level 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, as shown in Figure 2 shown, due to the increase in the volume of the power module, the size of the conductive materials required for inter-module connection also increases accordingly. And as an important conductive component in power electronic equipment, the increase in the size of the copper busbar further increases the manufacturing cost of the equipment. It can be seen that the existing three-level circuit topology has problems of large volume and high cost of the power module. Summary of the Utility Model

[0004] The utility model provides a power module based on a three-level topology, aiming to solve the problems of large volume of the power module and large size of the materials required for electrical connection, resulting in high cost, in the prior art due to the structural characteristics of the three-level circuit topology arranged in a triangular pyramid shape.

[0005] The utility model is implemented as follows. In the first aspect, a power module based on a three-level topology is provided, which 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 vertically arranged relative to the first power module and the second power module in the same horizontal direction, and the control terminal of the third power module faces the second power module.

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

[0007] Further, 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 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 first conductive connection member, and the output end of the inner tube bridge arm is connected to the AC side based on the second 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 and the second input end of the second outer tube bridge arm are connected to the DC_N input end. The second input end of the first outer tube bridge arm is connected to the DC_- input end. The first 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 first 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 first 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 laminated copper bus. The DC laminated copper bus 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 second outer tube bridge arm. The DC N pole input end is connected to the DC_N input end, the second input end of the second outer tube bridge arm, and the first input end of the first outer tube bridge arm. The DC negative input end is connected to the DC_- input end and the second input end of the first outer tube bridge arm.

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

[0011] Further, the second conductive connection member includes any one of a laminated copper bus, a copper bar, a cable, and a stacked bus bar for electrically connecting the inner tube bridge arm and the AC side.

[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 based on a fixing member.

[0013] Further, the first conductive connection member has a U-shaped structure.

[0014] Further, one end of the DC laminated copper busbar faces into the receiving groove of the first conductive connection member, and the other end extends out of the DC positive input terminal, the DC N-pole input terminal, and the DC negative input terminal toward the first edge of the radiator. The second conductive connection member has a convex structure, the bottom is close to the outside of the bottom of the receiving groove of the first conductive connection member, and the protrusion is 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 power module based on a three-level topology as described in the first aspect. The DC switch is connected to the input terminal of the power module based on the three-level topology by a DC power supply, 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 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 providing a power module based on a three-level topology, the first power module and the second power module are arranged in the same direction, and at the same time, the position of the third power module is vertically set relative to the first power module and the second power module along the same horizontal direction, ensuring that the third power module, the first power module, and the second power module are arranged side by side in the same horizontal direction. Compared with the traditional product-shaped arrangement, the space occupied is smaller, which is more conducive to reducing the volume of the power module. At the same time, combined with the arrangement of the third power module, the first power module, and the second power module side by side in the same horizontal direction and the setting method of orienting the control terminal of the third power module toward the second power module rather than the DC side, the use of electrical connection conductive materials between the third power module, the first power module, and the second power module can be saved, which is more conducive to realizing the miniaturization of equipment manufacturing and reducing the manufacturing cost. 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 3Schematic diagram of a three-level topology power module 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 Schematic diagram of module connection 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 first conductive connection piece, 5 is the second conductive connection piece, 6 is the DC laminated copper bar, 7 is the radiator, 71 is the first edge, 72 is the second edge, 8 is the fixing piece, 9 is the inverter, 91 is the DC switch, 92 is the DC capacitor, 93 is the inverter reactor, 94 is the AC switch, and 95 is the power module. Detailed implementation manners

[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 the present application, by arranging the first power module and the second power module in the same direction, and simultaneously arranging the third power module vertically relative to the positions of the first power module and the second power module along the same horizontal direction, it is ensured that the third power module, the first power module and the second power module are arranged side by side in the same horizontal direction, and the control terminal of the third power module is arranged towards the second power module instead of the DC side. Compared with the traditional triangular arrangement, the space occupied is smaller, which is more conducive to reducing the volume of the power module. At the same time, it can save the use of electrical connection conductive materials between the third power module, the first power module and the second power module, which is more conducive to realizing the miniaturization of equipment manufacturing and reducing the manufacturing cost.

[0026] Example 1

[0027] Combined with Figure 3 and Figure 4As shown in the figure, an embodiment of the present utility model provides a power module based on a three-level topology, including: a first power module 1, a second power module 2, and a third power module 3, each provided with a control terminal. The first power module 1 and the second power module 2 are arranged in the same direction, and the third power module 3 is vertically arranged relative to the first power module 1 and the second power module 2 in the same horizontal direction, and the control terminal of the third power module 3 faces the second power module 2;

[0028] The input end of the first power module 1 and the input end of the second power module 2 are connected to a DC input end. The output end of the first power module 1 and the output end of the second power module 2 are connected to the input end of the third power module 3 based on a first conductive connection member 4, and the output end of the third power module 3 is connected to the AC side based on a second conductive connection member 5.

[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 vertically arranged relative to the first power module 1 and the second power module 2, and one side of the control terminal of the third power module 3 is close to the second power module 2, which is equivalent to that the third power module 3 can be obtained by rotating the first power module 1 or the second power module 2 counterclockwise by 90 degrees.

[0031] More specifically, combined with Figure 2 As shown in the figure, compared with the need to vertically place each power module in a triangular arrangement structure, based on the above setting method, 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 ends to the input end of the third power module 3 through the first conductive connection member 4, and finally connecting the output end of the third power module 3 to the AC side, the DC-side electric energy can be converted to the AC-side output based on the three power modules, which can not only reduce the occupied space of the three power modules, but also make the connection method between the first power module 1, the second power module 2 and the third power module 3 more convenient, and the conductive elements used are fewer than those in the triangular structure, which is more conducive to realizing the miniaturization of the device and reducing costs.

[0032] In order to better illustrate the effect that a power module based on a three-level topology provided by this embodiment can reduce space occupation, combined with Figure 2 、 Figure 3As shown, when the setting gap L of each functional module is the same and is 5 mm, and the length × width of a single power module is 106.4 mm × 61.4 mm, a single power module group in the triangular 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 faces away from the power module connected to the DC side. However, based on the setting method of the three power modules in this embodiment, in the width direction, it occupies the width of two power modules, two gaps L, and the length of one power module. In the length direction, it occupies the length of one power module. And the gap L is much smaller than the length of the power module. If the occupied area is determined by the area, the occupied area of the triangular arrangement is (5 + 61.4×2)×(5 + 106.4×2) = 27834.84 mm², and the occupied area of the setting method provided in this embodiment is (5 + 5 + 61.4×2 + 106.4)×106.4 = 25450.88 mm². It can be seen that the setting method of each power module provided in this embodiment can reduce the space occupation more than the triangular setting method, and thus is more conducive to realizing the miniaturization of the device. At the same time, the control terminal of the third power module 3 in this embodiment faces the second power module 2. Compared with the triangular structure setting method, it can reduce the use of conductive elements. Especially in the case of multiple power module groups connected in parallel, it can also simplify the connection method.

[0033] More specifically, in combination with Figure 4 As shown, when the third power module 3 is electrically connected to the first power module 1 and the second power module 2, the electrical connection can be achieved through the first conductive connection member 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 electrical connection between the third power module 3 and the AC side is achieved through the second conductive connection member 5. Finally, based on the third power module 3, the electric energy is output to the AC side to output electric energy to the load on the AC side.

[0034] In the embodiment of the present utility model, compared with the triangular arrangement structure, the first power module 1 and the second power module 2 are arranged in the same direction, and at the same time, the position of the third power module 3 relative to the first power module 1 and the second power module 2 is vertically set along the same horizontal direction, ensuring that the third power module 3 is arranged side by side with the first power module 1 and the second power module 2 in the same horizontal direction, and the setting method of setting the control terminal of the third power module 3 towards the second power module 2 instead of the DC side occupies less space, so it is more conducive to reducing the volume of the power module group. At the same time, it can save the use of the electrical connection conductive material between the third power module 3 and the first power module 1 and the second power module 2, and is more conducive to realizing the miniaturization of device manufacturing and reducing the manufacturing cost.

[0035] Example 2

[0036] Combined 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, and the third power module 3 includes an inner tube bridge arm 31. The input end of the first outer tube bridge arm 11 is connected to the input end of the second outer tube bridge arm 21 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 first conductive connection member 4, and the output end of the inner tube bridge arm 31 is connected to the AC side based on the second conductive connection member 5;

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

[0038] Specifically, the DC side includes a storage battery, a solar panel, etc. The above-mentioned first power module 1 may include the first outer tube bridge arm 11 of a three-level ANPC circuit, corresponding to Figure 1 the lower tubes T6 and T4 therein; the second power module 2 is the second outer tube bridge arm 21, corresponding to Figure 1 the upper tubes T1 and T5 therein. 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 may be the inner tube bridge arm 31 of a three-level ANPC circuit, corresponding to Figure 1 T2 and T3 therein.

[0039] More specifically, by connecting the first input end of the first outer tube bridge arm 11 and the second input end of the second outer tube bridge arm 21 to the DC_N input end, connecting the second input end of the first outer tube bridge arm 11 to the DC_- input end, connecting the first input end of the second outer tube bridge arm 21 to the DC_+ input end, connecting the output end of the first outer tube bridge arm 11 to the first input end of the inner tube bridge arm 31 based on the first conductive connection member 4, and connecting the output end of the second outer tube bridge arm 21 to the second input end of the inner tube bridge arm 31 based on the first conductive connection member 4, it serves as the first input end and the second input end of the three-level circuit output to the third power module 3.

[0040] More specifically, combined Figure 4As shown, the above-mentioned first conductive connector 4 may include any one of laminated copper bars, copper strips, cables, and laminated busbars for electrically connecting the inner tube arm 31, the first outer tube arm 11, and the second outer tube arm 21. The above-mentioned second conductive connector 5 may include any one of laminated copper bars, copper strips, cables, and laminated busbars for electrically connecting the inner tube arm 31 and the AC side. By providing diverse ways, selection can be made according to actual needs to achieve the conversion of each power module from electrical energy input to output.

[0041] In this embodiment, based on the arrangement method of each power module in the above embodiment, by correspondingly connecting the input ends of the first outer tube arm 11 and the second outer tube arm 21 to the DC_+ input end, DC_N input end, and DC_- input end of the DC side, the connection between the inner and outer tube arms is realized through the first conductive connector 4, and the inner tube is connected to the AC side through the second conductive connector 5. Not only is the electrical energy on the DC side converted and output to the AC side, but the first conductive connector 4 and the second conductive connector 5 have diversity in selection and can be selected according to the actual situation; at the same time, compared with the triangular structure, it can also reduce the space occupied by the power module and the manufacturing cost of the equipment, which is more conducive to the miniaturization of the equipment.

[0042] Example 3

[0043] Combined Figure 4 As shown, in this embodiment, the input ends of the first outer tube arm 11 and the second outer tube arm 21 are connected to the DC input end through the DC laminated copper bar 6. The DC laminated copper bar 6 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 second outer tube arm 21. The DC N-pole input end is connected to the DC_N input end, the second input end of the second outer tube arm 21, and the first input end of the first outer tube arm 11. The DC negative input end is connected to the DC_- input end and the second input end of the first outer tube arm 11.

[0044] Specifically, in this embodiment, the first outer tube arm 11 and the second outer tube arm 21 can be connected to each input end of the DC side through the DC laminated copper bar 6. And corresponding to each input end of the DC side, the DC laminated copper bar 6 is also correspondingly provided with a DC positive input end, a DC N-pole input end, and a DC negative input end to achieve one-to-one connection. By setting the DC laminated copper bar 6, not only is the electrical energy on the DC side input into the power module, but the laminated copper bar uses 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 bar increases the effective area of the conductor, can reduce resistance and impedance, and improve the current transmission efficiency.

[0045] Example 4

[0046] Combined with Figure 4 Figure 5 As shown, in this embodiment, the power module further includes a radiator 7. The first power module 1, the second power module 2, and the third power module 3 are attached to the radiator 7 based on a heat-conducting member and fixed to the radiator 7 based on a fixing member 8.

[0047] Specifically, combined with Figure 5 As shown, as a possible implementation manner, for high-power occasions, power modules based on a three-level topology can be used in parallel, and the number of parallel connections can be selected according to power requirements. Figure 5 In it, 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 materials are used; and the form of direct parallel connection can achieve a higher output power level within a smaller volume range. And because the single power module provided in this embodiment occupies a small space, even if multiple are used in parallel, the occupied space is relatively smaller than that of the delta structure, which is more convenient for the layout of each electrical component during the design of the inverter 9, is beneficial to the miniaturization of equipment manufacturing, and at the same time the connection manner is more convenient, fewer conductive components are used, the size of the connection materials is reduced, and correspondingly the size of the cabinet structure can be reduced, so it is more beneficial to reduce costs.

[0048] As a possible implementation manner, Figure 4 is an implementation manner provided based on the parallel connection of two groups of power modules. Among them, for a single power module, in addition to including multiple power modules, a DC laminated copper busbar 6, a first conductive connection member 4, and a second conductive connection member 5, it may also include a radiator 7, and the radiator 7 is rectangular. Combined with Figure 4 As shown, the above-mentioned first conductive connection member 4 can be a laminated copper busbar with an outer tube and an inner tube connected. The second conductive connection member 5 can be an AC output copper busbar. The DC laminated copper busbar 6, the laminated copper busbar with an outer tube and an inner tube connected, and the AC output copper busbar can be respectively connected to the corresponding input terminals or output terminals in the bridge arms of the two power modules by means of screw connection. Among them, the DC laminated copper busbar 6 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, DC N input terminal, and DC negative input terminal of the DC laminated copper busbar 6 are correspondingly connected to the DC_+, DC_N, and DC_- buses; the laminated copper busbar with an outer tube and an inner tube connected is responsible for connecting the outer tube output terminals and inner tube input terminals of each power module; the AC output copper busbar is connected to the inner tube output terminals of each power module and serves as the AC electric energy output terminal of each power module.

[0049] Among them, the above-mentioned radiator 7 may include, but is not limited to, an extruded profile radiator 7, an aluminum radiator 7, 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 7 through the heat conducting member, which is beneficial to the heat of the power module being dissipated in time through the radiator 7 during operation. Among them, connectors such as screws and fixing glue may be used to fix the power module on the radiator 7.

[0050] 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 bus 6, a laminated copper bus with an outer tube and an inner tube connected, and an AC output copper bus can be provided to be respectively connected to the input end and the output end of each bridge arm. In this embodiment, only two groups of power modules connected in parallel are taken as an example for illustration.

[0051] In this embodiment, by providing it to the radiator 7 and attaching the first power module 1, the second power module 2, and the third power module 3 to the radiator 7 based on the heat conducting member, it is beneficial to the heat of the power module being dissipated in time through the radiator 7 during operation, ensuring the working reliability. At the same time, each power module is fixed to the radiator 7 through the fixing member 8 to ensure the installation stability of the power module.

[0052] Example 5

[0053] As Figure 4 shown, in this embodiment, the first conductive connector 4 has a U-shaped structure; one end of the DC laminated copper bus 6 faces into the receiving groove of the first conductive connector 4, and the other end extends out the DC positive input terminal, the DC N-pole input terminal, and the DC negative input terminal toward the first edge 71 of the radiator 7. The second conductive connector 5 has a convex structure, the bottom is close to the outside of the bottom of the receiving groove of the first conductive connector 4, and the protrusion is close to the second edge 72 of the radiator 7, where the first edge 71 and the second edge 72 are oppositely arranged.

[0054] Specifically, the first conductive connector 4 may have a U-shaped structure. By setting it to a U-shaped structure, whether it is one group of power modules or multiple groups of power modules, not only can the electrical connection between the inner tube bridge arm 31 and the outer tube bridge arm of the power module be realized, but when the DC laminated copper bus 6 is connected to each outer tube bridge arm of each power module, a part of the DC laminated copper bus 6 can also be accommodated in the receiving groove of the first conductive connector 4, saving the occupied space to a greater extent. Extending the respective input terminals to the first edge 71 of the radiator 7 on the other side will not occupy more space either.

[0055] More specifically, the second conductive connector 5 is arranged in a convex structure and connected to the output end of the inner tube bridge arm 31 of the power module. The bottom is close to the outer side of the bottom of the receiving groove of the first conductive connector 4, and the protrusion is close to the second edge 72 of the radiator 7 to serve as the output end of the AC side to realize the output of AC electric energy. Regardless of the number of power modules, the output ends of the inner tube bridge arms 31 of each power module can be connected to the second conductive connector 5 to realize the output of high power by multiple modules.

[0056] In this embodiment, by arranging the first conductive connector 4 in a U-shaped structure, not only can the electrical connection between the inner tube bridge arm 31 and the outer tube bridge arm of the power module be realized, but also when the DC laminated copper busbar 6 is connected to each outer tube bridge arm of each power module, a part of the DC laminated copper busbar 6 can be accommodated in the receiving groove of the first conductive connector 4, saving the occupied space to a greater extent; by arranging the second conductive connector 5 in a convex structure, the wide side of the bottom can be connected to the inner tube output ends of multiple power modules, and the AC output end is arranged as a protrusion, rather than being the same width as the bottom, which can save the use of materials, thus saving costs, and can realize the output of electric energy by multiple power modules through a unified port.

[0057] Example 6

[0058] Combined with Figure 6 As shown, in this embodiment, an inverter is provided, including a DC switch 91, a DC capacitor 92, an inverter reactor 93, an AC switch 94, and a power module based on a three-level topology in any of the above embodiments. The DC switch 91 is connected to the DC power supply and the input end of the power module based on the three-level topology. The DC capacitor 92 is connected in parallel between the DC switch 91 and the input end of the power module based on the three-level topology. The output end of the power module based on the three-level topology is connected to the input end of the inverter reactor 93. The AC switch 94 is connected to the output end of the inverter reactor 93 and the AC output end.

[0059] Specifically, the inverter 9 includes a DC switch 91, a DC capacitor 92, a power module based on a three-level topology ( Figure 6The power module 95), inverter reactor 93 and AC switch 94 therein. The inverter 9 can convert the DC power supply into an AC power supply for use in households, commercial and industrial settings, etc. Among them, the DC switch 91 can be used to control the switching state of the DC voltage at the input end to ensure that the DC voltage output by the inverter 9 is within a stable range. When the input voltage of the inverter 9 changes, the DC switch 91 will automatically adjust the magnitude of the output current to maintain current stability. The DC capacitor 92 can be used to stabilize the DC side voltage, buffer the instantaneous energy exchange during the switching process of the DC side and AC side of the inverter 9, effectively suppress the fluctuation of the DC side voltage, and ensure the stability of the AC output voltage. The power module can convert DC power into AC power to meet the requirements of different electrical equipment for AC power. The inverter reactor 93 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 9. The AC switch 94 is used to control the switching state of the AC power to ensure that the AC power output by the inverter 9 meets the equipment requirements. In the circuit of the inverter 9, the AC switch 94 may be used to control the on / off of the AC output, protect the equipment from damage, or adjust the output waveform, etc.

[0060] In this embodiment, for the power module based on the three-level topology provided in the above embodiment, compared with the arrangement structure of the product shape, the first power module 1 and the second power module 2 are arranged in the same direction, and at the same time, the third power module 3 is vertically arranged relative to the positions of the first power module 1 and the second power module 2 along the same horizontal direction, ensuring that the third power module 3 is arranged side by side with the first power module 1 and the second power module 2 in the same horizontal direction, and the control terminal of the third power module 3 is oriented towards the second power module 2 instead of the DC side, which occupies less space. Therefore, it is more conducive to reducing the volume of the power module, and at the same time, it can save the use of electrical connection conductive materials between the third power module 3 and the first power module 1 and the second power module 2, which is more conducive to realizing the miniaturization of equipment manufacturing and reducing the manufacturing cost. Therefore, the inverter 9 provided in this embodiment can also achieve the above-mentioned various embodiments and reach the corresponding effects, which will not be elaborated here.

[0061] The terms "first", "second", etc. in the specification and claims of the present invention or 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 at 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.

[0062] It should be understood that in the present utility model, "a plurality of" means two or more. " / or" is merely a variable relationship describing associated objects, indicating that there can be three relationships. For example, A / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Including A, B, and C", "including A, B, C" means that all of A, B, and C are included. "Including A, B, or C" means that one of A, B, and C is included. "Including A, B, and / or C" means that any one or any two or all three of A, B, and C are included.

[0063] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A power module based on a three-level topology, 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 vertically relative to the first power module and the second power module in the same horizontal direction, and the control terminal of the third power module faces the second power module; The input end of the first power module and the input end of the second power module are connected to the DC input end, the output end of the first power module and the output end of the second power module are connected to the input end of the third power module based on the first conductive connection component, and the output end of the third power module is connected to the AC side based on the second conductive connection component.

2. A power module based on a three-level topology 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 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 first conductive connecting member, and the output end of the inner tube bridge arm is connected to the AC side based on the second conductive connecting member.

3. A power module based on a three-level topology 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 and the second input end of the second outer tube bridge arm are connected to the DC_N input end, the second input end of the first outer tube bridge arm is connected to the DC_- input end, the first 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 first conductive connecting member, 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 first conductive connecting member.

4. A power module based on a three-level topology 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 laminated copper busbar, and the DC laminated copper busbar 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 second outer tube bridge arm, the DC N-pole input end is connected to the DC_N input end, the second input end of the second outer tube bridge arm and the first input end of the first outer tube bridge arm, and the DC negative input end is connected to the DC_- input end and the second input end of the first outer tube bridge arm.

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

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

7. A power module based on a three-level topology 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 a heat conductive member, and are fixed to the heat sink based on a fixing member.

8. The power module based on three-level topology according to claim 7, characterized in that: The first conductive connecting member has a U-shaped structure to form a receiving groove.

9. A power module based on a three-level topology according to claim 8, characterized in that: One end of the DC laminated copper busbar faces the receiving groove of the first conductive connector, and the other end extends the DC positive input terminal, DC N-pole input terminal and DC negative input terminal toward the first edge of the heat sink. The second conductive connector is a convex structure, with its bottom close to the outer side of the bottom of the receiving groove of the first conductive connector, and the protrusion 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 power module based on a three-level topology as described in any one of claims 1 to 9, wherein the DC switch connects a DC power supply and an input end of the power module based on a three-level topology, the DC capacitor is connected in parallel between the DC switch and the input end of the power module based on a three-level topology, the output end of the power module based on a three-level topology 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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