Patent ID: 7292463

Claim:
A dc-ac converter, comprising: a dc power supply; a transformer having a primary side and at least one secondary side; a semiconductor switch circuit for allowing a primary current from said dc power supply to flow through said primary side in a first and a second directions alternately; a load connected to said secondary side; a current detection circuit for detecting the level of the current through said load to generate a current detection signal; a control signal generation circuit for generating a control signal for controlling said semiconductor switch circuit based on said current detection signal; and a switch driving circuit receiving said control signal and a run-stop signal, said switch driving circuit adapted to provide said semiconductor switch circuit with a switch drive signal in accord with said control signal when said run-stop signal has a logical run-state instructing running, when said run-stop signal has a stop-state instructing stopping, provide said semiconductor switch circuit with a switch drive signal that prevent a primary current form flowing through said primary side.