Patent ID: 8451631

Claim:
A control apparatus applied to a resonance type power conversion circuit comprising a transformer and a switch circuit comprising one switch or a plurality of switches, the control apparatus comprising: an output voltage detector detecting a value of an output voltage of the power conversion circuit; an exciting current peak time detecting unit to detect a peak time of an exciting current of the transformer, the exciting current peak time detector comprising: a peak time detector data buffer to store a value of a primary current of the transformer sequentially; and a peak time detector to detect the exciting current peak time based on data stored in the peak time detector data buffer; and a timing generator to generate switch timing signals on the basis of the output voltage and the peak time, the timing generator comprising: a timing generator data buffer to store an output voltage of the power conversion circuit; an average voltage calculator to calculate an average of the output voltage based on data stored in the timing generator data buffer; a deviation calculator to detect a deviation between an output of the average voltage calculator and a reference voltage and to calculate a time corresponding to the deviation; and a timing generating circuit to generate an off timing signal for a first switch after passage of the calculated time following detection of the peak time by the peak time detector and an on timing signal for a second switch after a reverse voltage is applied to the second switch after the first switched is turned off and before a forward voltage is applied to the second switch.