Patent ID: 8866459

Claim:
A method of converting an input alternating current (AC) signal to an output AC signal using synchronous pulse width modulation comprising: receiving the input AC signal; producing a reference signal based on the input AC signal; producing a first pulse-width modulated signal based on the level of said reference signal; inverting the first pulse width modulated signal, thereby producing a second pulse width modulated signal having an inverse duty cycle; and driving a first and a second converter switches using the first pulse-width modulated signal and the second pulse width modulated signal according to a first and a second modes, thereby producing said output signal, wherein in the first mode, the first converter switch is driven by the first pulse width modulated signal, and the second converter switch is driven by the second pulse width modulated signal, and in the second mode, the first converter switch is driven by the second pulse width modulated signal, and the second converter switch is driven by the first pulse width modulated signal.