Impulse capacitor

Abstract

An impulse capacitor belongs to the capacitor. A problem of high equivalent series inductance of metallized-film pulse capacitor can be solved. The impulse capacitor is suitable for a pulse power system in which the internal inductance of the capacitor is a nanohenry grade. In the invention, a first group of capacitance film, a first polyester insulation film, a second group of capacitance film, a second polyester insulation film, a third group of capacitance film and a third polyester insulation film are successively wound from inside to outside on a mandrel. A shell is installed out of the third polyester insulation film. Upper end surfaces of the first and second groups of the capacitance films are connected and lower end surfaces are insulated. The lower end surfaces of the second andthe third groups of the capacitance films are connected and the upper end surfaces are insulated. The third group of capacitance film is insulated with the shell. The lower end surface of the first group of capacitance film is taken as a low voltage extraction electrode and is connected with the impulse capacitor shell. The upper end surface of the third group of the capacitance film is taken as high voltage extraction electrode and is connected with a high voltage output terminal of the impulse capacitor. The impulse capacitor can bear the higher application voltage so that the equivalent series inductance of a whole capacitor can be reduced and the nanohenry grade can be reached.

Description

technical field [0001] The invention belongs to capacitors, in particular to a pulse capacitor, which is suitable for a pulse power system requiring the internal inductance of the capacitor to be at the nanohenry level. Background technique [0002] The main energy storage dielectric material used in pulse capacitors is polymer dielectric film, which can be divided into foil capacitors and metallized film capacitors according to the form of metal electrodes. Foil capacitors are made of insulating dielectric film and aluminum foil, impregnated with liquid impregnating agent, and lead-out sheets (electrodes); metallized film capacitors are wound by insulating dielectric films with metal evaporated on the surface. Electrodes and pulse capacitors must have internal inductance and internal resistance. An actual pulse capacitor can be equivalently represented by series capacitance, resistance and inductance. The equivalent series inductance will affect the current peak value, puls...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a pulse capacitor, which is used in a pulse power system, solves the problem that the equivalent series inductance of the existing metallized film pulse capacitor is relatively high, and is suitable for the application field of rapid discharge or large current discharge

Images