Large-capacity film capacitor

Abstract

The invention discloses a large-capacity film capacitor, comprising an anode connecting terminal in connection with the anode of a power supply, an anode connecting polar plate welded with the anode of a capacitor core, a cathode connecting terminal in connection with the cathode of the power supply, capacitor cores, and a cathode connecting polar plate welded with the cathode of the capacitor core, wherein the large-capacity film capacitor further comprises a cathode connecting copper foil, an anode connecting copper foil, an anode-cathode insulation plate, a plurality of left polar plate copper foil spacers and a plurality of right polar plate copper foil spacers, and the capacitor cores are arranged in a square shape; the anode connecting copper foil passes through a plurality of the left polar plate copper foil spacers, the anode-cathode insulation plate and a corresponding space among four adjacent capacitor cores, respectively, and is welded integrally with the anode of the capacitor core; and the cathode connecting copper foil passes through a plurality of the right polar plate copper foil spacers, the anode-cathode insulation plate and a corresponding space among the four adjacent capacitor cores, respectively, and is integrally welded with the cathode of the capacitor core. The large-capacity film capacitor in the invention improves the capacitance of the capacitor, reduces the capacitive volume, and reduces the cost.

Description

technical field [0001] The invention relates to a large-capacity film capacitor. Background technique [0002] With the continuous emergence of high-voltage power transmission and distribution, large-scale wind turbines, and the maturity of power conversion technology, power transmission and distribution is particularly important. As a large number of power electronic devices (such as controllable diodes, thyristors, insulated gate bipolar transistors, etc.) used in power transmission and distribution, their work uses controllable switches to achieve power conversion. In order to obtain better electrical performance, device manufacturers continue to increase the switching sensitivity of controllable devices, resulting in an increase in the frequency of devices in circuit use. Although high frequency helps to improve the quality of power supply, it also generates unfavorable characteristics - high frequency ripple. In the circuit, the high-frequency ripple has a great influ...

AI Technical Summary

Problems solved by technology

Therefore, the area of ​​the loop composed of the positive and negative plates and the capacitor core is too large, and the inductance is naturally too large

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