Patent ID: 7729134

Claim:
A power conversion circuit characterized by comprising: a transformer that includes a primary winding, which has one end connected to a positive electrode side of a direct-current power supply, and a secondary winding, which has one end connected to a negative electrode side of the DC power supply so that its phase is opposite to that of the primary winding, wherein a ratio between numbers of turns of the windings is set to 1:1; a capacitor for outputting voltage, the capacitor having one end connected to the negative electrode side of the DC power supply; a first switch interposed between an other end of the secondary winding of the transformer and the positive electrode side of the direct-current power supply; a second switch interposed between an other end of the primary winding of the transformer and the negative electrode side of the direct-current power supply; a third switch interposed between the other end of the secondary winding of the transformer and an other end of the capacitor; and a fourth switch interposed between the other end of the primary winding of the transformer and the other end of the capacitor.