Patent ID: 7835161

Claim:
A dc-ac converter, comprising: a dc power supply; a transformer having a primary side and at least one secondary side; a switch circuit having a first and a second semiconductor switches connected in series with each other via said primary side to allow a primary current from said dc power supply to flow through said primary side in a first direction, and a third and fourth semiconductor switches connected in series with each other via said primary side to allow a primary current from said dc power supply to flow through said primary side in a second direction; a current detection circuit for detecting a detection current associated with the current through a load connected to said secondary side; a triangular signal generation circuit for generating a triangular signal train for pulse-width modulation (PWM); a PWM circuit for generating a PWM signal upon comparison of a feedback signal based on said detection current received from said current detection circuit with said triangular signal train; a logic circuit for generating a drive signal for driving said first semiconductor switch, said second semiconductor switch, said third semiconductor switch and fourth semiconductor switch in accordance with said PWM signal.