DC-DC converter

A DC--DC convertor comprising:

• a transformer having a primary winding adapted to be connected in series with a DC power source and a secondary winding;
• a rectifier and smoothing circuit;
• a main switching means, adapted to be connected in series with said DC power source, for connecting said rectifier and smoothing circuit to said secondary winding of said transformer when said main switching means is in an on-state;
• an auxiliary switching circuit connected in parallel with said main switching means, said auxiliary switching circuit comprising a first capacitor connected in parallel with a second capacitor that is connected in series with an auxiliary switching device;
• and
• a signal generating circuit means for providing a first control signal to said main switching means and a second control signal to said auxiliary switching device to control on/off operation of said main switching means and said auxiliary switching device such that both said main switching means and said auxiliary switching device are in an off-state simultaneously in a manner wherein said main switching means turns on after a first rest period has elapsed after said auxiliary switching device turns off and said auxiliary switching device turns on after a second rest period has elapsed after said main switching means turns off, said first rest period being between 1/4 and 1/6 of a resonance period determined by an inductance of said transformer and said first capacitor, and said second rest period being less than 1/2 of a period during which said main switching means is in an off-state.