Patent ID: 9647534
Date: 2017-05-09
CPC Classifications: H02M,Y02B

Claim:
1. A power conversion apparatus comprising: a power conversion circuit that forms a closed loop by connecting a first inductor and a first capacitor to both ends of an AC power supply in series, forms a closed loop by connecting a first switch and a second switch in series, connecting a third switch and a fourth switch in series, and respectively connecting the first switch and the third switch, and the second switch and the fourth switch, connects a series circuit consisting of the first capacitor, a second inductor different from the first inductor, and a primary winding of a transformer between a connection point of the first switch and the second switch, and a connection point of the third switch and the fourth switch, connects a second capacitor different from the first capacitor between a connection point of the first switch and the third switch, and a connection point of the second switch and the fourth switch, includes a rectification smoothing circuit in a secondary winding of the transformer, and connects a load to an output of the rectification smoothing circuit; and a control unit configured to supply a gate driving signal for alternately opening and closing a set of the first switch and the fourth switch, and a set of the second switch and the third switch to a set of the first switch and the fourth switch, and a set of the second switch and the third switch such that a current in which a high frequency component is mixed into a low frequency component of the AC power supply flows through the power conversion circuit and a frequency of the high frequency component is modulated in synchronization with a phase of the low frequency component of the AC power supply based on a power supply voltage that is obtained by a detection unit configured to detect the voltage of the AC power supply, a circuit current that is obtained by a detection unit configured to detect the circuit current flowing through the power conversion circuit, and a capacitor voltage obtained by a detection unit configured to detect a voltage of the second capacitor.