Origin Electric Company, Limited

Yasuo Kii

Atsushi Nakamura

Ryoji Saito

Mikio Ito

A series resonant power converter in which a resonant copacitor is commonly used in a series resonant circuit and a parallel resonant circuit, whereby a capacitance of the resonant capacitor can be considerably decreased as compared with that of a tank circuit according to a prior art, so that an energy handled by the resonant capacitor can be decreased, which results in decreasing a size of the resonant circuit and also decreasing a power loss. The converter includes means for detecting and computing a voltage applied across a main switch means in its OFF-state and a control circuit for driving the main switch means to its ON-state when the detected and computed value of the voltage drops to a minimum voltage required to sustain oscillation of the series resonant circuit. The minimum voltage is computed by a detecting circuit for detecting an input voltage, a detecting circuit for detecting a voltage of a second resonant circuit and a detecting circuit for detecting a DC output voltage converted to a primary side of a main transformer.

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Tokyo, Japan

Yasuo Kii