Resonant power conversion apparatus

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.