Patent ID: 6172558
Filing Date: 2001-01-09
Classification: G01R,H03F

Abstract:
A switching amplifier comprising:a plurality n of successively-connected cascade elements, each of said cascade elements being substantially identical, said plurality of cascade elements being odd and greater than or equal to three;each of said cascade elements containing a single phase, controlled power inverter bridge comprised of switch elements; anda control device connected to the respective switch elements in the respective power inverters in the respective cascade elements, said control device operating all of said switch elements with a uniform switching frequency, having a switching period associated therewith, by pulse width modulation, and said control device operating respective, comparable switch elements of the respective cascade elements to drive said respective, comparable switch elements offset from cascade element-to-cascade element by 1/n times said switching period, thereby generating a common-mode charging current in said cascade elements which is easily filterable.