RESONANCE-TYPE POWER CONVERTER

PURPOSE:To prevent magnetic saturation of the title converter, by disposing in an array a reactor of a value smaller than that of the self-inductance of the primary winding of a transformer in equivalence to the primary or secondary winding. CONSTITUTION:A resonance-type DC-DC converter forms a DC input power source with a series circuit of a DC power source Ei and a reactor Li, which is connected to the primary winding of a transformer T through a pair of switching elements Q1 and Q2. A resonance circuit 1 of a resonance capacitor Cr and a reactor Lr is disposed in an array to this primary winding. Switching elements Q1 and Q2 are driven by a drive circuit 2 coming from the resonance type voltage detection winding Ng of the transformer T. On this occasion, for the value of the resonance reactor Lr, the reactor of such a value is used as is sufficiently smaller than that of the self-inductance Li of the whole primary winding. The switching frequency can thereby be heightened to high frequency without regard to the value of the self-inductance Li and the saturation of the transformer core can be prevented.