Large-current conductive structure of frequency converter
By connecting the conductive strips in parallel with the printed circuit copper foil, combined with the soldering pin module and the horn capacitor, the problem of low conductivity connection efficiency in the high-power inverter is solved, and the entire machine size and lower material cost are achieved. .
Patent Information
- Application Number
- CN202421227535.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In existing high-power inverters, the conductive connection between the main circuit elements leads to low utilization rate of copper discharge and high cost, and the soldering connection of printed circuit boards is difficult to bear high current load, which limits the high-power soldering pin integrated module. application.
The conductive strip is connected in parallel with the printed circuit copper foil, combined with the soldering pin module and the horn capacitor, and the conductive strip is set to welding with the printed circuit copper foil through three-dimensional space, jointly bear the high current load, and passes the copper-clad aluminum or aluminum foil Materials optimize conductive connections to reduce material costs.
The circuit board connection between high-power integrated module and capacitor is realized, the main structure of the inverter is simpler, the overall size is smaller, and the copper consumption and material cost are greatly reduced.
Smart Images
Figure CN222365873U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of power electronics technology, and specifically relates to a high-current conductive structure of a frequency converter. Background Art
[0002] The main circuit components of conventional medium and large power inverters include rectifier modules, inverter modules and electrolytic capacitors. Due to the large current in the main circuit, these components are usually connected to each other using copper bars for conduction and screws.
[0003] In order to reduce the impact of the copper busbar conductor reactance on the circuit, the conductive connection between the main circuit components is usually achieved by using two overlapping copper plates with insulation isolation. The copper plates are covered on the rectifier bridge and inverter module, and large holes are left at different conductive ends to ensure the necessary electrical clearance and creepage distance. As a result, the utilization rate of the copper busbar is greatly reduced, resulting in high costs.
[0004] With the development of circuit integration technology, inverter module component manufacturers continue to launch smaller, more powerful integrated modules that include rectification and inversion. In order to reduce the size, all conductive pins are soldered, usually using printed circuit board welding connections. However, the conductive cross-section of the printed circuit copper foil is small and cannot pass large currents, thus limiting the application of this high-power solder-pin integrated module. Summary of the invention
[0005] In response to the above problems, the present application proposes a high-current conductive structure for a frequency converter, which adopts a high-power welding pin-type integrated module (hereinafter referred to as the welding pin-type module) and a small-volume welding horn electrolytic capacitor (hereinafter referred to as the horn capacitor). The conductive bus is set in three-dimensional space in parallel with the printed circuit copper foil to jointly bear the high current load, thereby realizing the circuit board connection of the high-power integrated module and the capacitor. The main structure of the frequency converter is more streamlined, the size of the whole machine is smaller, the copper consumption is lower, and the material cost and labor cost are greatly reduced.
[0006] To achieve the above objectives, this application adopts the following technical solutions:
[0007] The conductive bus is connected in parallel with the copper foil of the printed circuit to jointly bear the high current load.
[0008] The conductive bar is provided with a plurality of inserting teeth, inserted into the printed circuit board, and welded to the copper foil of the printed circuit board.
[0009] The conductive copper foil and conductive row group connected between the solder pin type module and the horn capacitor, the positive and negative conductive copper foils or conductive rows are arranged in an overlapping manner along the large surface direction, and an insulating layer is padded in the middle.
[0010] The conductive bar is made of copper plate, copper-clad aluminum bar or aluminum bar. When copper-clad aluminum bar is used, the copper plate with insert teeth is riveted to the copper-clad aluminum bar; when aluminum bar is used, the copper plate with insert teeth is laser welded to the aluminum bar. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 A three-dimensional schematic diagram of an example of a high current conductive structure described in this application;
[0012] Figure 2 A side view of an example of a high current conductive structure described in this application;
[0013] Figure 3 A schematic diagram of a welding-type conductive bar as an example of a high-current conductive structure described in this application;
[0014] Figure 4 A schematic diagram of a conductive row group of an example of a high current conductive structure described in this application;
[0015] Figure 5 This is a schematic diagram of a conductive bar material of an example of a high current conductive structure described in this application using a copper-clad aluminum bar;
[0016] Figure 6 This is a schematic diagram of an example of a high current conductive structure described in this application when the conductive bar material is aluminum bar;
[0017] Figure 7 This is an example diagram of the main structure of a conventional inverter described in this application.
[0018] The serial numbers of the above drawings are explained as follows:
[0019] 1-welding pin type module, 2-printed circuit board, 3-welding type conductive bar, 4-lap type conductive bar, 5-conductive bar group one, 51-positive conductive bar, 52-negative conductive bar, 53-insulating part, 6-conductive bar group two, 7-horn capacitor, 8-heat sink, 9-riveted copper plate, 10-tooth insert, 11-copper rivet, 12-welded copper plate, 13-welding hole.
[0020] It should be specially noted that the above-mentioned drawings are colored schematic diagrams, and the colors thereof are not the natural colors of the components, but are colored only for the convenience of distinction and identification. DETAILED DESCRIPTION
[0021] In conjunction with the above drawings, the specific implementation of the present application is described as follows:
[0022] like Figure 1The figure shows an example of the main structure of an inverter using two solder pin modules 1 and ten horn capacitors 7. A printed circuit board 2 is covered on the solder pin modules 1 and the horn capacitors 7 installed on the heat sink 8, and all the conductive pins of the solder pin modules 1 and the horn capacitors 7 are welded to the copper foil on the printed circuit board 2.
[0023] The input and output ends of the solder pin module 1 are both led out by soldering type conductive bars 3, such as Figure 3 As shown, the welding type conductive bar 3 can be set in different shapes as needed, but the same point is that one end thereof is provided with a plurality of insert teeth 10, which are welded on the printed circuit board 2, and the welding end is usually close to the conductive pin of the solder pin module 1. The other end of the welding type conductive bar 3 can be connected to the overlapping type conductive bar 4 or directly led out as needed.
[0024] The conductive connection between the solder pin module 1 and the horn capacitor 7 adopts the method of connecting the conductive row and the printed circuit copper foil in parallel to jointly bear the large current load. The positive and negative conductive copper foils or conductive rows are arranged in an overlapping manner along the large surface direction, and an insulating layer is provided in the middle; the conductive row group can be arranged parallel to or vertically with the circuit board, preferably arranged vertically with the printed circuit board, which is more conducive to heat dissipation and improves the current carrying density, thereby reducing its cross-sectional size; the positive and negative printed circuit copper foils are respectively laid on both sides of the circuit board, overlapping in a large area, and the glass fiber layer of the circuit board is the insulating layer; and the positive and negative conductive rows form a Figure 4 In the conductive bar group 1 5 shown, the positive conductive bar 51 and the negative conductive bar 52 largely overlap with each other after being separated by an insulating member 53 .
[0025] In order to further reduce the material cost, the conductor connection is realized by replacing copper with aluminum. The above-mentioned welding type conductive bar 3, positive electrode conductive bar 51, negative electrode conductive bar 52 and other conductive bars can be made of copper plate, copper-clad aluminum bar, or aluminum bar.
[0026] Figure 5 It shows that when the conductive bar material is a copper-clad aluminum bar, a riveted copper plate 9 with a plurality of inserts 10 is provided, and a plurality of copper rivets 11 are used to rivet the copper-clad aluminum bar. The inserts 10 of the riveted copper plate 11 are used to be inserted into a printed circuit board 2 and welded to the copper foil of the printed circuit to achieve a conductive connection.
[0027] Figure 6 It shows that when the conductive bar material is an aluminum bar, a welding copper plate 12 with a plurality of inserts 10 is provided, which is laser welded to the aluminum bar, and a long strip welding hole 13 parallel to the current direction is provided on the welding copper plate 12 to increase the weld to increase the conductive cross-sectional area. The inserts 10 of the welding copper plate 12 are used to be inserted into the printed circuit board 2 and welded to the copper foil of the printed circuit to achieve a conductive connection.
[0028] Figure 7This is an example of the main structure of a conventional inverter described in this application. The conductive connection between the main circuit elements is usually achieved by using two overlapping copper plates that are insulated and isolated. The copper plates are covered on the rectifier module and the inverter module. Large holes are left at different conductive ends to ensure the necessary electrical clearance and creepage distance. As a result, the utilization rate of the copper busbar is greatly reduced, resulting in high costs.
[0029] In summary, the beneficial effects of the present application are: by utilizing the three-dimensional space to set up the conductive bus in parallel with the printed circuit copper foil to jointly bear the high current load, the circuit board connection of the high-power integrated module and the capacitor is realized, the main structure of the inverter is more streamlined, the size of the whole machine is smaller, the copper consumption is lower, and the material cost and labor cost are greatly reduced.
Claims
1. A high current conducting structure of a frequency converter, characterized by: The conductive bus and the printed circuit copper foil are connected in parallel to share the high current load. The conductive bar is provided with a plurality of insert teeth (10), inserted on the printed circuit board (2), and welded to the copper foil of the printed circuit board; The conductive copper foil and conductive row group connected between the solder pin module (1) and the horn capacitor (7) have the positive and negative conductive copper foils or conductive rows arranged in an overlapping manner along their large surfaces, with an insulating layer in between; The conductive bar is made of copper plate, copper-clad aluminum bar, or aluminum bar.
2. The high current conductive structure according to claim 1, characterized in that: When the conductive bar material is a copper-clad aluminum bar, a riveted copper plate (9) with a plurality of insert teeth (10) is provided to be riveted to the copper-clad aluminum bar.
3. The high current conductive structure according to claim 1, characterized in that: When the conductive bar material is an aluminum bar, a welding copper plate (12) with a plurality of insert teeth (10) is provided to be laser welded to the aluminum bar.
4. The high current conductive structure according to claim 3, characterized in that: The welding copper plate (12) is provided with a long strip welding hole (13) parallel to the current direction.