Patent ID: 6643156
Filing Date: 2003-11-04
Classification: H02M

Abstract:
An apparatus for converting DC power to two-phase AC power, comprising:(a)three one-leg switch inverters wherein a first leg produces VPhase1, the second leg produces Vneutral, and the third leg produces VPhase2 and wherein VPhase1 is out of phase with VPhase2; (b)a controller/driver circuit having a switching waveform generator and first and second sinusoidal reference waveform generators, the sinusoidal waveforms generated at the desired AC output frequency, and the switching signal generated at a higher frequency; (c)means for comparing the switching waveform with the first reference waveform to produce a first pulse width modulated signal which drives the first leg; (d)means for comparing the switching waveform with the second reference waveform to produce a second pulse width modulated signal which drives the third leg; (e)means for determining the slope of the switching waveform which drives the second leg with a 50% duty cycle.