Capacitor busbar structure with low stray inductance

Abstract

The utility model discloses a capacitor busbar structure with low stray inductance, which comprises a capacitor body, a positive electrode row and a negative electrode row, the positive electrode row and the negative electrode row are stacked, and an isolation plate is arranged between the positive electrode row and the negative electrode row; the capacitor body is arranged on the anode bar, the anode of the capacitor body is conductively connected with the anode bar, the cathode bar is conductively connected with a conducting strip penetrating through the isolation plate and the anode bar, and the conducting strip is conductively connected with the cathode of the capacitor body. According to the utility model, the positive electrode bar and the negative electrode bar of the capacitor busbar adopt the laminated design, and the laminated layers are insulated and isolated by the isolation plates, so that positive and negative currents can flow in parallel at a short distance after the capacitor is electrified, and the positive and negative electrodes have the same current and opposite directions; therefore, magnetic fields generated by the positive electrode row and the negative electrode row are mutually offset, the inductance value of a loop is greatly reduced, the high-frequency response of the circuit is finally improved, and the signal-to-noise ratio of the circuit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor busbar structure with low stray inductance. Background Art

[0002] The busbar structure commonly used in capacitors on the market today places the positive and negative electrodes on the positive and negative ends of the capacitor core, respectively. This busbar design is simple and easy to weld; however, the capacitors made with this copper busbar design have high stray inductance. This is because the positive and negative currents of the capacitor busbar structure flow in separate directions. The effects of the stray inductance of the capacitor on the circuit are as follows:

[0003] 1: Reduce the circuit frequency response characteristics: parasitic inductance will reduce the high-frequency response of the circuit.

[0004] 2: Loss of signal energy: Stray inductance will perform low-pass filtering on the signal, thereby losing some of the high-frequency signal energy.

[0005] 3: Generate noise: Due to the influence of stray inductance on the signal, it will also generate noise to a certain extent, reducing the signal-to-noise ratio of the circuit. Utility Model Content

[0006] In response to the defects in the prior art, the purpose of the present invention is to provide a capacitor busbar structure with low stray inductance, which can reduce the stray inductance of the capacitor, thereby improving the frequency characteristics of the circuit using the capacitor and improving the signal-to-noise ratio of the circuit.

[0007] The technical solution adopted by the utility model is: a low stray inductance capacitor busbar structure, comprising a capacitor body, a stacked positive electrode row and a negative electrode row, with an isolation plate provided between the positive electrode row and the negative electrode row; the capacitor body is arranged on the positive electrode row and its positive electrode is conductively connected to the positive electrode row, the negative electrode row is conductively connected to a conductive sheet passing through the isolation plate and the positive electrode row, and the conductive sheet is conductively connected to the negative electrode of the capacitor body.

[0008] This technical solution adopts a stacked design for the positive and negative poles of the capacitor busbars, with isolation plates used to insulate the stacks. This allows the positive and negative currents to flow in parallel over a close distance after the capacitor is energized. Since the positive and negative poles have the same current magnitude but opposite directions, the magnetic fields generated by the positive and negative poles cancel each other out, greatly reducing the inductance of the loop, ultimately improving the high-frequency response of the circuit and reducing the signal-to-noise ratio of the circuit.

[0009] Preferably, the positive electrode row is provided with a through hole for the conductive sheet to pass through, and an insulating isolation ring is provided in the through hole for the conductive sheet to pass through.

[0010] Preferably, one side of the positive electrode row is provided with a bending portion that bends upward, and a plurality of groups of positive output terminals arranged in pairs are provided on the bending portion. A negative output terminal connected to the negative electrode row is provided between each pair of positive output terminals, and pressure rivet screws are provided on the positive output terminals and the negative output terminals.

[0011] Preferably, a positive electrode input terminal and a negative electrode input terminal are provided on the side of the positive electrode row and the negative electrode row end opposite to the bent portion, and are electrically connected to the positive electrode row and the negative electrode row respectively.

[0012] The beneficial effects of the present invention are as follows: the present invention adopts a laminated design for the positive and negative poles of the capacitor busbar, and uses an isolation plate for insulation isolation between the laminates, so that after the capacitor is energized, the positive and negative currents can flow in parallel at a close distance. Since the positive and negative poles have the same current magnitude but opposite directions, the magnetic fields generated by the positive and negative poles cancel each other out, greatly reducing the inductance value of the loop, ultimately improving the high-frequency response of the circuit, reducing the signal-to-noise ratio of the circuit, and improving the quality of the capacitor busbar; the utility model has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0014] Figure 1 This is a three-dimensional diagram of a capacitor busbar structure with low stray inductance provided in an embodiment of the present utility model.

[0015] Figure 2 This is an assembly diagram of a capacitor busbar structure with low stray inductance provided in an embodiment of the present utility model.

[0016] Reference numerals: capacitor body 100 , positive electrode row 200 , negative electrode row 300 , separator 400 , conductive sheet 500 , insulating isolation ring 600 , positive output terminal 700 , negative output terminal 800 , positive input terminal 900 , negative input terminal 1000 . DETAILED DESCRIPTION

[0017] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0018] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0019] like Figure 1 and Figure 2 As shown, a specific embodiment of the present invention provides a capacitor busbar structure with low stray inductance. This structure adopts a laminated design to improve the quality of the capacitor busbar; it specifically includes a capacitor body 100, a stacked positive electrode row 200 and a negative electrode row 300, and an isolation plate 400 is provided between the positive electrode row 200 and the negative electrode row 300; the capacitor body 100 is arranged on the positive electrode row 200 and its positive electrode is conductively connected to the positive electrode row 200, and the negative electrode row 300 is conductively connected to a conductive sheet 500 passing through the isolation plate 400 and the positive electrode row 200, and the conductive sheet 500 is conductively connected to the negative electrode of the capacitor body 100.

[0020] like Figure 1 and Figure 2 As shown, through the above arrangement, in this embodiment, the positive electrode row 200 and the negative electrode row 300 of the capacitor busbar adopt a laminated design. After stacking, the isolation plate 400 is insulated and isolated. The capacitor body array is arranged on the positive electrode row 200. The positive electrode of the capacitor body is welded to the positive electrode row 200, and the negative electrode is welded to the conductive sheet 500. When the capacitor is energized, the positive and negative currents can flow in parallel at a close distance. Since the currents are of the same magnitude but in opposite directions, the magnetic fields generated by the positive electrode row 200 and the negative electrode row 300 cancel each other out, greatly reducing the inductance of the loop, ultimately improving the high-frequency response of the circuit and reducing the signal-to-noise ratio of the circuit. In this embodiment, the conductive sheet 500, the positive electrode row 200, and the negative electrode row 300 adopt a copper busbar structure and are conductively connected by welding.

[0021] As previously mentioned, after the conductive sheet 500 is welded to the negative electrode array 300, it needs to pass through the positive electrode array 200 to be welded to the negative electrode of the capacitor body 100. In this embodiment, a through hole is provided on the positive electrode array 200 for the conductive sheet 500 to pass through, and an insulating isolation ring 600 is provided within the through hole for the conductive sheet 500 to pass through. This allows the insulating isolation ring 600 to be secured within the through hole, allowing the conductive sheet 500 to pass through the insulating isolation ring 600 and connect to the negative electrode of the capacitor body 100, providing effective insulation and isolation.

[0022] like Figure 1 and Figure 2As shown, this embodiment has an upwardly curved bend on one side of the positive electrode busbar 200. The bend is provided with multiple pairs of positive output terminals 700. Between each pair of positive output terminals 700 is a negative output terminal 800 connected to the negative electrode busbar 300. Both the positive and negative output terminals 700 are provided with pressure rivets. In this way, the positive and negative electrodes of the capacitor busbar 200 and 300 can be connected to the device via the output terminals on the side. The use of pressure rivets provides greater connection stability. At the same time, this embodiment also provides a positive input terminal 900 and a negative input terminal 1000, electrically connected to the positive and negative electrodes, 200 and 300, respectively, on the side opposite the bend at the ends of the positive and negative electrodes. These terminals are used to connect to input devices.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A capacitor busbar structure with low stray inductance, characterized in that: The invention comprises a capacitor body (100), a positive electrode array (200) and a negative electrode array (300) arranged in a stacked manner, A separator (400) is provided between the positive electrode row (200) and the negative electrode row (300); The capacitor body (100) is arranged on the positive electrode row (200) and its positive electrode is conductively connected to the positive electrode row (200); the negative electrode row (300) is conductively connected to a conductive sheet (500) passing through the isolation plate (400) and the positive electrode row (200); and the conductive sheet (500) is conductively connected to the negative electrode of the capacitor body (100).

2. The low stray inductance capacitor busbar structure according to claim 1, characterized in that: The positive electrode row (200) is provided with a through hole for the conductive sheet (500) to pass through, and an insulating isolation ring (600) is provided in the through hole for the conductive sheet (500) to pass through.

3. The low stray inductance capacitor busbar structure according to claim 1, characterized in that: One side of the positive electrode row (200) is provided with a bent portion that bends upward, and a plurality of groups of positive electrode output terminals (700) arranged in pairs are provided on the bent portion. A negative electrode output terminal (800) connected to the negative electrode row (300) is provided between each pair of positive electrode output terminals (700), and pressure riveting screws are provided on the positive electrode output terminals (700) and the negative electrode output terminals (800).

4. The low stray inductance capacitor busbar structure according to claim 3, characterized in that: A positive electrode input terminal (900) and a negative electrode input terminal (1000) are provided on the side of the positive electrode row (200) and the negative electrode row (300) opposite to the bent portion, and are electrically connected to the positive electrode row (200) and the negative electrode row (300) respectively.

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