| 摘要 |
A transformer has a secondary winding with an intermediate tap. Two switching elements are connected in series between terminals of the primary winding. A dc power source is connected between a connecting point of the switching elements and the intermediate tap of the primary winding. By turning on and off the switching elements alternately, parallel resonance is produced by primary self inductance and a capacitor provided on the primary side of the transformer. Series resonance is produced by leakage inductance between the primary and secondary sides and a capacitor provided on the secondary side. Turning on of the switching elements at a zero-voltage state and turning off of the switching elements at a zero-current state are realized. Since this transformer is a push-pull type one, currents flowing through the switching elements are reduced to half of a half bridge type transformer.
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