Low-inductance power capacitor

A technology of power capacitors and capacitors, which is applied to the terminals of fixed capacitors and parts of fixed capacitors, etc., which can solve problems such as damage to absorption capacitors and affect the normal operation of equipment, and achieve reduced self-inductance, uniform heat dissipation, and short current flow paths Effect

CN104465082AActive Publication Date: 2015-03-25ANHUI TONGFENG ELECTRONICS
6 Cites 9 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-03-25

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention relates to a low-inductance power capacitor which comprises a cover plate assembly, a shell and a capacitor core set fixed into the shell. The capacitor core set is formed by overlapping a plurality of capacitance cores in a layering mode. A positive electrode leading copper strip and a negative electrode leading copper strip are mutually overlapped and arranged on the two sides of the non-metal-spraying face of the capacitor core set. Insulating layers are arranged between overlapped parts of the connecting parts of the positive electrode leading copper strip and the negative electrode leading copper strip and a terminal. The metal spraying faces of the two ends of each capacitor core are electrically connected to auxiliary leading copper strips respectively in a welding mode, wherein the auxiliary leading copper strips are transversely arranged. The two ends of each auxiliary leading copper strip of each end of the capacitor core set are fixed to the positive electrode or negative electrode leading copper strip through welding. The double leading copper strips are arranged on the two sides of the capacitor core set, the path for leading currents to the copper strips is the shortest, the current density is reduced, the self-inductance of the capacitor can be reduced obviously, and the safety performance of equipment like a current transformer can be improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a power capacitor, in particular to a low inductance power capacitor. Background technique

[0002] At present, the market demand for high-power converters is increasing, and the IGBT power unit responsible for the current conversion task requires higher output current, greater output power, and greater power density. In order to meet these performances of the high-power converter, the self-inductance of the DC support capacitor in the inverter is required to be as small as possible. The higher the switching frequency of the converter, the greater the output current and the greater the rate of change of the current; then the greater the voltage induced on the DC bus. According to the formula: U=L*di / dt, it can be seen that improving the inductance value of the capacitor itself will greatly reduce the induced voltage of the converter under the condition of large output current and high switching frequency.

[0003] The high-po...

Examples

Embodiment Construction

[0014] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0015] Such as figure 1 As shown, the present invention includes a cover plate assembly 1 , a casing 2 and a capacitor core group 3 fixed in the casing 2 . One or more capacitor core groups 3 can be arranged side by side, and the outside of each capacitor core group 3 is wrapped with an insulating film and placed in the casing 2, and the insulating film is placed on the figure 1 is not drawn in. The positive and negative poles of the capacitor core group 3 are electrically connected to t...