Bus capacitor assembly and frequency converter

Abstract

The utility model discloses a bus capacitor assembly and a frequency converter, and relates to the frequency converter technology field, the bus capacitor assembly comprises a substrate, an input conductive layer, an output conductive layer, a conduction module, an inversion module and a capacitor module, the input conductive layer and the output conductive layer are laid on the substrate, the conduction module is used for being connected with a rectifier bridge, and the inversion module is used for being connected with the capacitor module. The inverter module is used for converting direct current into alternating current, the inverter module is in electric signal connection with the rectifier bridge through the input conducting layer, the output conducting layer and the conduction module, the capacitor module is provided with two terminals, and the two terminals are welded to the input conducting layer and the output conducting layer respectively. According to the technical scheme provided by the utility model, the technical problems of complex installation and low integration degree existing in the conduction of laminated busbars in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a busbar capacitor component and a frequency converter. Background Art

[0002] In modern industrial production, frequency converters (VFDs), as an important electrical control device, are widely used in various applications, enabling precise control of motor parameters such as speed and torque. As a key component of VFDs, the quality and performance of laminated busbars directly impact the operational performance and safety of the entire VFD system. Existing laminated busbars are typically constructed by stacking multiple busbars, resulting in complex installation and low integration.

[0003] Therefore, it is necessary to provide a new busbar capacitor assembly and inverter to solve the above technical problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a busbar capacitor assembly and a frequency converter, aiming to solve the technical problems of complex installation and low integration in the prior art using laminated busbar conduction.

[0005] To achieve the above objectives, the present invention provides a busbar capacitor assembly comprising:

[0006] substrate;

[0007] an input conductive layer and an output conductive layer, wherein the input conductive layer and the output conductive layer are both laid on the substrate;

[0008] A conduction module and an inverter module, wherein the conduction module is used to connect to a rectifier bridge, and the inverter module is used to convert direct current into alternating current. The inverter module is electrically connected to the rectifier bridge through the input conductive layer, the output conductive layer, and the conduction module;

[0009] The capacitor module has two terminals, the two terminals are respectively welded to the input conductive layer and the output conductive layer, and the inverter module is connected in parallel with the capacitor module.

[0010] In one embodiment, the input conductive layer includes a first conductive sheet, a second conductive sheet, and a third conductive sheet, both of which are electrically signal-connected to the first conductive sheet; the output conductive layer includes a fourth conductive sheet and a fifth conductive sheet, both of which are electrically signal-connected to the fourth conductive sheet; the first conductive sheet, the second conductive sheet, and the fifth conductive sheet are sequentially spaced apart along a first direction of the substrate on one end surface of the substrate; and the third conductive sheet and the fourth conductive sheet are sequentially spaced apart along the first direction of the substrate on the other end surface of the substrate;

[0011] The inverter module is connected to the third conductive plate and the fourth conductive plate, the conduction module is connected to the first conductive plate and the fifth conductive plate, and the two connection terminals of the capacitor module are respectively welded to the second conductive plate and the fourth conductive plate.

[0012] In one embodiment, the capacitor module includes a capacitor unit, and two connecting terminals of the capacitor unit are welded to the second conductive plate and the fourth conductive plate respectively.

[0013] In one embodiment, there are a plurality of capacitor units, and the plurality of capacitor units are arranged in a staggered rectangular shape.

[0014] In one embodiment, the inverter module includes three inverter units arranged at intervals and three connecting copper bars arranged in a one-to-one correspondence with the three inverter units, each connecting copper bar passes through the substrate and is connected to the output end of the corresponding inverter unit, the positive pole of each inverter unit is connected to the third conductive plate, and the negative pole of each inverter unit is connected to the fourth conductive plate.

[0015] In one embodiment, an absorption capacitor is provided at a position of the substrate corresponding to each of the inversion units, and the absorption capacitor is connected to the first conductive sheet and the fourth conductive sheet.

[0016] In one embodiment, the conduction module includes an input copper busbar and an output copper busbar, the input copper busbar is connected to the first conductive sheet, and the output copper busbar is connected to the fifth conductive sheet.

[0017] In one embodiment, the busbar capacitor assembly further includes a relay and a charging terminal, and both the relay and the charging terminal are electrically signal-connected to the output conductive layer.

[0018] In one embodiment, bus bars are welded to both the input circuit layer and the output circuit layer.

[0019] In addition, the present invention also provides a frequency converter, comprising:

[0020] a housing, wherein a mounting seat is provided in the housing;

[0021] The busbar capacitor assembly as described above is arranged on the mounting seat.

[0022] The technical solution of the present utility model realizes the electrical signal connection between the inverter module and the rectifier bridge by laying an input conductive layer and an output conductive layer on the substrate to replace the existing laminated busbar, which can simplify the structure and reduce the difficulty and cost of production; by directly welding the capacitor module on the substrate, the integration can be improved. In this embodiment, the conduction module is connected to the external rectifier bridge to transmit the DC power rectified by the rectifier bridge to the bus capacitor assembly. The inverter module is used to convert DC power into AC power and transmit the converted AC power to the external three-phase motor. By directly welding the capacitor module on the substrate, the capacitor module and the substrate can be connected to form a whole, which improves the integration of the bus capacitor assembly and thereby reduces the difficulty of assembling the inverter. By laying input and output conductive layers on a substrate to replace existing laminated busbars, electrical signal connections between the rectifier bridge and inverter module are achieved. This simplifies the structure, reduces manufacturing difficulty, and reduces the use of copper busbars, lowering manufacturing costs. It also increases the overlap area and solves the large parallel spacing problem associated with laminated busbar conduction, thereby reducing stray inductance. This busbar capacitor assembly is applicable to the field of inverter technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the connection structure between the busbar capacitor assembly and the mounting base in the embodiment provided by the utility model;

[0025] Figure 2 for Figure 1 Exploded diagram;

[0026] Figure 3 A schematic structural diagram of the substrate, input conductive layer, and output conductive layer provided by the present invention;

[0027] Figure 4 This is a schematic diagram of the connection structure of the substrate, capacitor module and relay provided by the utility model;

[0028] Figure 5 for Figure 4 Schematic diagram from another perspective.

[0029] Description of Figure Numbers:

[0030] 1. Substrate; 11. Absorption capacitor; 2. Input conductive layer; 21. First conductive sheet; 22. Second conductive sheet; 23. Third conductive sheet; 24. Busbar; 3. Output conductive layer; 31. Fourth conductive sheet; 32. Fifth conductive sheet; 4. Conductive module; 41. Input copper busbar; 42. Output copper busbar; 5. Inverter module; 51. Inverter unit; 52. Connecting copper busbar; 6. Capacitor module; 61. Capacitor unit; 7. Relay; 71. Terminal block; 8. Charging terminal; 9. Mounting base; 91. Mounting column; 92. Accommodation hole.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that meet both A and B.

[0035] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0036] As a key component of the inverter, the laminated busbar serves primarily as a conductive element for the rectifier bridge, inverter module, and capacitor. In existing inverters, the laminated busbar primarily consists of a positive busbar, a negative busbar, a neutral busbar, and insulating paper. This complex structure increases the difficulty of installing the laminated busbar, which in turn increases the difficulty and cost of manufacturing the inverter. Furthermore, the use of the laminated busbar to conduct the rectifier bridge, inverter module, and capacitor results in a relatively dispersed structure, requiring numerous components to be installed, resulting in a low level of integration.

[0037] The utility model provides a busbar capacitor assembly and a frequency converter, aiming to solve the technical problems of complex installation and low integration in the prior art of adopting laminated busbar conduction.

[0038] See also Figures 1 to 3 In one embodiment of the present utility model, the busbar capacitor assembly includes a substrate 1, an input conductive layer 2, an output conductive layer 3, a conduction module 4, an inverter module 5 and a capacitor module 6. The input conductive layer 2 and the output conductive layer 3 are both laid on the substrate 1. The conduction module 4 is used to connect to the rectifier bridge. The inverter module 5 is used to convert direct current into alternating current. The inverter module 5 is connected to the rectifier bridge electrical signal through the input conductive layer 2, the output conductive layer 3 and the conduction module 4. The capacitor module 6 has two terminals, which are respectively welded to the input conductive layer 2 and the output conductive layer 3, and the inverter module 5 and the capacitor module 6 are connected in parallel.

[0039] The technical solution of the present utility model realizes the electrical signal connection between the inverter module 5 and the rectifier bridge by laying the input conductive layer 2 and the output conductive layer 3 on the substrate 1 to replace the existing laminated busbar, which can simplify the structure and reduce the difficulty and cost of production; by directly welding the capacitor module 6 on the substrate 1, the integration can be improved. In this embodiment, the conduction module 4 is connected to the external rectifier bridge to transmit the DC power rectified by the rectifier bridge to the bus capacitor assembly. The inverter module 5 is used to convert DC power into AC power and transmit the converted AC power to the external three-phase motor. By directly welding the capacitor module 6 on the substrate 1, the capacitor module 6 can be connected to the substrate 1 to form a whole, thereby improving the integration of the bus capacitor assembly and reducing the difficulty of assembling the inverter. By laying an input conductive layer 2 and an output conductive layer 3 on a substrate 1 to replace the existing laminated busbars, electrical signal connections between the rectifier bridge and the inverter module 5 are achieved. This simplifies the structure, reduces manufacturing difficulty, and reduces the use of copper busbars, lowering manufacturing costs. It also increases the overlap area and solves the problem of large parallel spacing between laminated busbars, thereby reducing stray inductance. This busbar capacitor assembly is applicable to the field of inverter technology.

[0040] It should be noted that substrate 1 is made of an insulating material and does not have conductive properties. Input conductive layer 2 and output conductive layer 3 are made of a conductive material (e.g., copper) and do have conductive properties. The overlap area refers to the size of the overlapping area between two adjacent busbars in a stacked busbar; parallel spacing refers to the distance between the centerlines of adjacent busbars when multiple busbars are installed side by side; and stray inductance refers to the equivalent inductance exhibited by conductors in a circuit, such as connecting wires, component leads, and component bodies. It is caused by factors such as the physical layout and connection method of the conductors. Therefore, by providing input conductive layer 2 and output conductive layer 3 on substrate 1 to increase the overlap area, stray inductance can be reduced.

[0041] See also Figure 3 In one embodiment of the present invention, the input conductive layer 2 includes a first conductive sheet 21, a second conductive sheet 22 and a third conductive sheet 23, both of which are electrically connected to the first conductive sheet 21. The output conductive layer 3 includes a fourth conductive sheet 31 and a fifth conductive sheet 32, which is electrically connected to the fourth conductive sheet 31. The first conductive sheet 21, the second conductive sheet 22 and the fifth conductive sheet 32 ​​are sequentially spaced along a first direction of the substrate 1 on one end surface of the substrate 1. The third conductive sheet 23 and the fourth conductive sheet 31 are sequentially spaced along the first direction of the substrate 1 on the other end surface of the substrate 1. The first direction refers to Figure 3The direction indicated by the X in FIG. 1 is shown; the inverter module 5 is connected to the third conductive plate 23 and the fourth conductive plate 31; the conduction module 4 is connected to the first conductive plate 21 and the fifth conductive plate 32; and the two terminals of the capacitor module 6 are welded to the second conductive plate 22 and the fourth conductive plate 31, respectively. In this embodiment, the second conductive plate 22 and the third conductive plate 23 are both electrically signal-connected to the first conductive plate 21, and the fifth conductive plate 32 is electrically signal-connected to the fourth conductive plate 31. That is, the potentials of the second conductive plate 22 and the third conductive plate 23 are equal to the potential of the first conductive plate 21, and the potentials of the fifth conductive plate 32 and the fourth conductive plate 31 are equal. The inverter module 5 is connected to the third conductive sheet 23 and the fourth conductive sheet 31, and the conduction module 4 is connected to the first conductive sheet 21 and the fifth conductive sheet 32. Specifically, the positive electrode of the inverter module 5 is connected to an external rectifier bridge via the third conductive sheet 23, the first conductive sheet 21, and the conduction module 4, while the negative electrode of the inverter module 5 is connected to the external rectifier bridge via the fourth conductive sheet 31, the fifth conductive sheet 32, and the conduction module 4. This allows the inverter module 5 to communicate with the external rectifier bridge, forming a closed loop. The two terminals of the capacitor module 6 are welded to the second conductive sheet 22 and the fourth conductive sheet 31, respectively. Specifically, one terminal of the capacitor module 6 is connected to the external rectifier bridge via the second conductive sheet 22, the first conductive sheet 21, and the conduction module 4, while the other terminal of the capacitor module 6 is connected to the external rectifier bridge via the fourth conductive sheet 31, the fifth conductive sheet 32, and the conduction module 4. This allows the capacitor module 6 to communicate with the external rectifier bridge, forming another closed loop. This achieves parallel connection between the capacitor module 6 and the inverter module 5.

[0042] See also Figure 4 In one embodiment of the present invention, busbars 24 are welded to both the input circuit layer and the output circuit layer. The busbar 24 is a large conductor used to transmit electrical energy, primarily for carrying high currents. In this embodiment, by welding the busbars 24 to the input conductive layer 2 and the output conductive layer 3, the current carrying capacity of the input conductive layer 2 and the output conductive layer 3 can be increased to meet the current carrying capacity and temperature rise requirements of the inverter. Specifically, busbars 24 are welded to the first conductive sheet 21, the second conductive sheet 22, the third conductive sheet 23, the fourth conductive sheet 31, and the fifth conductive sheet 32. In a specific embodiment, the busbars 24 can be metal sheets. Alternatively, the current carrying capacity of the input conductive layer 2 and the output conductive layer 3 can be increased by wave soldering or other methods to meet the current carrying capacity and temperature rise requirements of the inverter. Furthermore, to better protect the conductive layer, insulating material can be applied to the end surface of the conductive layer facing away from the substrate 1.

[0043] See also Figure 1 、 Figure 2 and Figure 4In one embodiment of the present invention, the capacitor module 6 includes a capacitor unit 61, and the two connecting terminals of the capacitor unit 61 are respectively welded to the second conductive plate 22 and the fourth conductive plate 31. In this embodiment, by directly welding the two connecting terminals of the capacitor unit 61 to the second conductive plate 22 and the fourth conductive plate 31, the capacitor unit 61 can be connected to the substrate 1 to form a whole, thereby improving the integration of the busbar capacitor assembly. During the assembly process of the inverter, there is no need to install the capacitor unit 61 separately. Instead, it is only necessary to install the busbar capacitor assembly with the capacitor unit 61 welded to it. This can simplify the installation process and reduce the difficulty of assembling the inverter.

[0044] See also Figure 4 In one embodiment of the present invention, the number of capacitor units 61 is multiple, and the multiple capacitor units 61 are arranged in a rectangular staggered manner. The busbar capacitor assembly in this embodiment uses a smaller capacitor unit 61. By connecting multiple capacitor units 61 in parallel to meet the capacitance value required by the inverter, the production cost can be reduced. Specifically, in order to meet the capacitance value required by the inverter, the related art directly connects a large capacitor unit 61 to the circuit, while this solution uses multiple small capacitor units 61 connected in parallel to the circuit. The total price of the multiple small capacitor units 61 used to achieve the same capacitance value is less than the price of the large capacitor unit 61. Therefore, by connecting multiple capacitor units 61 in parallel to the circuit to meet the capacitance value required by the inverter, the production cost can be reduced; and the space occupied by the capacitor module 6 can also be reduced, thereby improving space utilization. In this embodiment, the number of capacitor units is 14, and the 14 capacitor units 61 are arranged in two rows, and the two rows of capacitor units 61 are both sinusoidally distributed, that is, the multiple capacitor units are arranged in four rows, and the multiple capacitor units 61 in any two adjacent rows are staggered. It should be noted that when multiple small capacitors are connected in parallel, their total capacity is the sum of the capacities of each capacitor. For example, if two 10μF capacitors are connected in parallel, the total capacity that can be achieved is 20μF.

[0045] See also Figure 1 and Figure 2In one embodiment of the present invention, the inverter module 5 includes three inverter units 51 spaced apart and three connecting copper bars 52 corresponding to the three inverter units 51. Each connecting copper bar 52 passes through the substrate 1 and is connected to the output terminal of the corresponding inverter unit 51. The positive electrode of each inverter unit 51 is connected to the third conductive plate 23, and the negative electrode of each inverter unit 51 is connected to the fourth conductive plate 31. The conduction module 4 includes an input copper bar 41 and an output copper bar 42. The input copper bar 41 is connected to the first conductive plate 21, and the output copper bar 42 is connected to the fifth conductive plate 32. In this embodiment, the three connecting copper bars 52 are respectively connected to the V-phase, U-phase, and W-phase electrical signals of an external three-phase motor. Each inverter unit 51 transmits the inverted AC power to the V-phase, U-phase, and W-phase of the external three-phase motor through the corresponding connecting copper bar 52. The input copper bar 41 is connected to the positive electrode of an external rectifier bridge, and the output copper bar 42 is connected to the negative electrode of the external rectifier bridge. Specifically, the positive electrode of each inverter unit 51 is connected to the positive electrode of the external rectifier bridge through the third conductive sheet 23, the first conductive sheet 21, and the input copper busbar 41, and the negative electrode of each inverter unit 51 is connected to the negative electrode of the external rectifier bridge through the fourth conductive sheet 31, the fifth conductive sheet 32, and the output copper busbar 42. This enables each inverter unit 51 to be connected to the external rectifier bridge to form a closed loop. In a specific embodiment, the inverter unit 51 can be an insulated gate bipolar transistor (IGBT), which is a composite fully controlled voltage-driven power semiconductor device composed of a bipolar junction transistor (BJT) and an insulated gate field effect transistor (MOS). In this embodiment, an external copper busbar is also provided on the substrate 1. The external copper busbar is connected to the first conductive sheet 21. The external copper busbar and the output copper busbar 42 serve as connection ports for connecting to the positive and negative electrodes of an external device to provide direct current to the external device.

[0046] See also Figure 2 In one embodiment of the present invention, an absorption capacitor 11 is provided at a position corresponding to each inverter unit 51 on the substrate 1. The absorption capacitor 11 is connected to the first conductive plate 21 and the fourth conductive plate 31. Since the first conductive plate 21 and the third conductive plate 23 have the same potential, the absorption capacitor 11 is electrically connected to the third conductive plate 23 and the fourth conductive plate 31. Specifically, the absorption capacitor 11 is a special type of capacitor, mainly used in power electronic equipment to suppress voltage spikes and absorb excess energy, thereby protecting sensitive components in the circuit. In this embodiment, the absorption capacitor 11 and the inverter unit 51 are both used to connect the third conductive plate 23 and the fourth conductive plate 31, that is, the absorption capacitor 11 is connected in parallel with the inverter unit 51, wherein the absorption capacitor 11 plays the role of absorbing spike voltage. Connecting the absorption capacitor 11 in parallel with the inverter unit 51 can eliminate the spike voltage caused by the stray inductance of the conductive plates, thereby avoiding damage to the inverter unit 51.

[0047] See also Figure 4 and Figure 5 In one embodiment of the present invention, the busbar capacitor assembly further includes a relay 7 and a charging terminal 8, and the relay 7 and the charging terminal 8 are both welded to the output conductive layer 3. In this embodiment, the relay 7 is welded to the fifth conductive sheet 32, and the charging terminal 8 is welded to the fourth conductive sheet 31 and is used to connect an external pre-charging resistor. The controller is used to control the on and off of the circuit so that the pre-charging resistor connected to the charging terminal 8 is connected to the circuit or the pre-charging resistor is disconnected from the circuit. Specifically, before the DC power rectified by the rectifier bridge is input to the busbar capacitor assembly, the relay 7 and the pre-charging resistor are connected in parallel to the circuit, which can charge the capacitor unit 61 in the capacitor module 6, thereby preventing the capacitor unit 61 from being damaged. In a specific embodiment, the busbar capacitor assembly is also provided with a terminal 71 connected to the electrical signal of the relay 7. The terminal 71 is used to connect to the control line of the external controller so that the relay 7 is connected to the external controller, thereby enabling the staff to transmit signals to the relay 7 through the external controller and perform regulation.

[0048] See also Figure 5 In one embodiment of the present invention, the number of relays 7 is multiple, and the multiple relays 7 are arranged at intervals. In this embodiment, multiple relays 7 are connected to the circuit in parallel. The volume of the relays 7 in this embodiment is relatively small. By connecting multiple small relays 7 to the circuit in parallel to meet the load requirements of the frequency converter, the production cost can be reduced. Specifically, in order to meet the load requirements of the frequency converter, in the related art, large relays 7 are usually directly installed by bolting, while the present application adopts multiple small relays 7 directly welded to the bus capacitor assembly, wherein the total price of multiple small relays 7 used to meet the same load requirements is less than the price of large relays 7. Therefore, by connecting multiple small relays 7 to the circuit in parallel to meet the load requirements of the frequency converter, the production cost can be reduced. In addition, by directly welding the relays 7 to the substrate 1, the relays 7 can be connected to the substrate to form a whole, thereby improving the integration of the bus capacitor assembly and reducing the difficulty of assembling the frequency converter.

[0049] The present invention also provides a frequency converter including the aforementioned bus capacitor assembly. The specific structure of the bus capacitor assembly is similar to that of the aforementioned embodiments. Since the frequency converter utilizes all of the technical solutions of all of the aforementioned embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and therefore, no further details will be given here.

[0050] See also Figure 1In a specific embodiment, the inverter includes a housing and the above-mentioned busbar capacitor assembly. A mounting seat 9 is provided in the housing, and the busbar capacitor assembly is provided on the mounting seat 9. Specifically, a mounting post 91 is provided on the mounting seat 9, and the busbar capacitor assembly is mounted on the mounting post 91 by bolts. In order to avoid electrical signal connection between the busbar capacitor assembly and the mounting seat 9, an insulating post can be provided between the busbar capacitor assembly and the mounting post 91. In addition, the mounting seat 9 is provided with an accommodating hole 92 at the position corresponding to each capacitor unit 61, and the capacitor unit 61 is accommodated in the accommodating hole 92, which can reduce the volume of the inverter and make the structure of the inverter more compact.

[0051] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A busbar capacitor assembly, characterized in that: include: substrate; an input conductive layer and an output conductive layer, wherein the input conductive layer and the output conductive layer are both laid on the substrate; A conduction module and an inverter module, wherein the conduction module is used to connect to a rectifier bridge, and the inverter module is used to convert direct current into alternating current. The inverter module is electrically connected to the rectifier bridge through the input conductive layer, the output conductive layer, and the conduction module; The capacitor module has two terminals, the two terminals are respectively welded to the input conductive layer and the output conductive layer, and the inverter module is connected in parallel with the capacitor module.

2. The busbar capacitor assembly according to claim 1, wherein: The input conductive layer includes a first conductive sheet, a second conductive sheet and a third conductive sheet, both of which are electrically connected to the first conductive sheet. The output conductive layer includes a fourth conductive sheet and a fifth conductive sheet, both of which are electrically connected to the fourth conductive sheet. The first conductive sheet, the second conductive sheet and the fifth conductive sheet are sequentially spaced apart along a first direction of the substrate on one end surface of the substrate. The third conductive sheet and the fourth conductive sheet are sequentially spaced apart along the first direction of the substrate on the other end surface of the substrate. The inverter module is connected to the third conductive plate and the fourth conductive plate, the conduction module is connected to the first conductive plate and the fifth conductive plate, and the two connection terminals of the capacitor module are respectively welded to the second conductive plate and the fourth conductive plate.

3. The busbar capacitor assembly according to claim 2, wherein: The capacitor module includes a capacitor unit, and two connecting terminals of the capacitor unit are respectively welded to the second conductive plate and the fourth conductive plate.

4. The busbar capacitor assembly according to claim 3, wherein: There are multiple capacitor units, and the multiple capacitor units are arranged in a rectangular staggered manner.

5. The busbar capacitor assembly according to claim 2, wherein: The inverter module includes three inverter units arranged at intervals and three connecting copper bars arranged in a one-to-one correspondence with the three inverter units. Each connecting copper bar passes through the substrate and is connected to the output end of the corresponding inverter unit. The positive electrode of each inverter unit is connected to the third conductive plate, and the negative electrode of each inverter unit is connected to the fourth conductive plate.

6. The busbar capacitor assembly according to claim 5, characterized in that: An absorption capacitor is provided at a position of the substrate corresponding to each of the inversion units, and the absorption capacitor is connected to the first conductive sheet and the fourth conductive sheet.

7. The busbar capacitor assembly according to claim 2, wherein: The conduction module includes an input copper busbar and an output copper busbar, the input copper busbar is connected to the first conductive sheet, and the output copper busbar is connected to the fifth conductive sheet.

8. The busbar capacitor assembly according to any one of claims 1 to 7, characterized in that: The busbar capacitor assembly further includes a relay and a charging terminal, both of which are electrically signal-connected to the output conductive layer.

9. The busbar capacitor assembly according to any one of claims 1 to 7, characterized in that: The input circuit layer and the output circuit layer are both welded with bus bars.

10. A frequency converter, characterized in that: include: a housing, wherein a mounting seat is provided in the housing; The busbar capacitor assembly according to any one of claims 1 to 9, wherein the busbar capacitor assembly is arranged on the mounting seat.

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