Patent ID: 6703818
Filing Date: 2004-03-09
Classification: H02M

Abstract:
A method for performing power conversion in a transformerless power converter device to provide a converter output AC waveform from a converter input AC waveform, said input waveform having an input power level, an input frequency, an input waveform shape, and an input voltage/current characteristic, comprising the steps of:(a) applying said converter input AC waveform to a converter switch having a converter switch frequency; (b) operating said converter switch at said converter switch frequency to provide a switched waveform, said switched waveform having a plurality of switched waveform notches with a notch repetition rate substantially equal to said converter switch frequency; and (c) filtering said switched waveform to provide said converter output AC waveform having: (1) a an output power level substantially equal to said input power level; (2) an output frequency substantially equal to said input frequency; (3) an output waveform shape substantially similar to said input waveform shape; and (4) an output voltage/current characteristic substantially different from said input voltage/current characteristic whereby the relative input/output power levels, frequencies, waveform shapes and voltage/current characteristics are provided without the use of a transformer.