Patent ID: 7952334
Filing Date: 2011-05-31
Classification: H02M

Abstract:
1. A DC-DC converter comprising: a first series circuit including a first switch element and a second switch element and connected to ends of a DC power source; a second series circuit including a primary winding of a transformer and a capacitor and connected in parallel with one of the first switch element and the second switch element; a rectifying-smoothing circuit configured to rectify and smooth a voltage generated by a secondary winding of the transformer; a controller configured to alternately turn on/off the first and second switch elements according to an output voltage from the rectifying-smoothing circuit; a first timing detector configured to detect ON/OFF states of the first and second switch elements; a second timing detector configured to detect ON/OFF states of the first and second switch elements; and an ON time storing part configured to operate in response to a detection signal from the second timing detector and store an ON time of the first switch element based on an OFF time of the second switch element, wherein the controller turns on the second switch element only for the ON time stored in the ON time storing part.