Low inductance integral capacitor assembly

摘要

The invention provides an integral high-voltage capacitor assembly that yields very low self inductance and provides voltage and current multiplication. The capacitor assembly has two or four capacitors connected in series, with each capacitor made up of a stack of capacitor cells (40) also connected in series. Each of the capacitor cells (40) includes an arrangement of a pair of elongate foil electrodes (10) separated by dielectric (20, 30), and multiply-folded in a substantially flat, wound configuration. In the case of the two-capacitor assembly, in one embodiment the adjacent capacitor cells of the first capacitor (11) are connected in series by joining their foil electrodes on only one longitudinal side of the foil electrodes, while the adjacent capacitor cells of the second capacitor (12) are connected in series by joining their foil electrodes on both longitudinal sides of the foil electrodes. By connecting two units of the two-capacitor assemblies in different ways, various four-capacitor assemblies (80; 90) can be configured to provide enhanced voltage and current multiplication.

主权项

1. A high-voltage capacitor assembly, comprising:
a first capacitor (11); and a second capacitor (12); each capacitor comprising a stack of capacitor cells (40) connected in series; each of the capacitor cells (40) comprising an arrangement of a pair of elongate foil electrodes (10) separated by dielectric (20, 30) and multiply-folded in a substantially flat, wound configuration; wherein adjacent cells of the stack comprising the first capacitor are connected in series by joining their foil electrodes on one longitudinal side of the foil electrodes; wherein adjacent cells of the stack comprising the second capacitor are connected in series by joining their foil electrodes on both longitudinal sides of the foil electrodes; and wherein the first and second capacitors are connected in series and integrated into an enclosure (70); wherein the assembly includes external electrodes (17) that are connected internally to the first and second capacitors (11, 12); wherein the external electrodes comprise on said one longitudinal side a first pair of external electrodes connected to the first and second capacitors in series, and on the other longitudinal side a second pair of external electrodes connected to the second capacitor; and wherein the pairs of external electrodes are connected to the respective capacitor foil electrodes via partially insulated sheet-like conductive elements that are bent longitudinally to form two inverted L-shapes (21, 22) or two U-shapes (23).