Rabin & Berdo, P.C.
Control apparatus for resonant converter
A control apparatus for a resonant converter that receives a direct current (DC) voltage of a bulk capacitor. The control apparatus includes a forced turn-off control circuit that receives a resonance current detection signal, which has been produced by shunting a resonance current flowing through the resonant converter and converting the shunted resonance current to a voltage, outputs a forced turn-off signal in response to the resonance current detection signal falling between a first variable threshold and a second variable threshold that is smaller than the first variable threshold, and varies the first variable threshold and the second variable threshold in accordance with an input voltage inputted to the forced turn-off control circuit by dividing the DC voltage of the bulk capacitor.
FUJI ELECTRIC CO., LTD.
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Jian
Chen