Patent ID: 8300428

Claim:
A resonant power conversion apparatus comprising: a transformer having a primary winding, a secondary winding, a tertiary winding connected in series with the secondary winding, and a reset winding connected in series with the primary winding; a first series circuit connected between first and second ends of a DC power source and including a first switch and a second switch; a first capacitor and a first diode that are connected in parallel with the first switch; a second capacitor and a second diode that are connected in parallel with the second switch; a second series circuit connected between the first and second ends of the DC power source and including the primary winding of the transformer and a third diode; a third series circuit connected between the first and second ends of the DC power source and including the reset winding of the transformer and a fourth diode; a reactor connected between a connection point of the first and second switches and a connection point of the secondary and tertiary windings of the transformer; a first auxiliary switch connected between the first end of the DC power source and a first end of the secondary winding of the transformer; a second auxiliary switch connected between the second end of the DC power source and a first end of the tertiary winding of the transformer; and a controller configured to alternately turn on the first and second switches and alternately turn on the first and second auxiliary switches, so that the first and second switches each conduct a zero-voltage switching operation.