Patent ID: 9705410
Date: 2017-07-11
CPC Classifications: H02M,Y02B

Claim:
1. A power conversion apparatus comprising: a transformer having a primary coil and a secondary coil; a primary-side full bridge circuit having a first arm circuit where a first arm at a high side and a second arm at a low side are connected in series and a second arm circuit where a third arm at a high side and a fourth arm at a low side are connected in series, the primary coil being included in a bridge part that connects a connected point at which the first arm and the second arm are connected with a connected point at which the third arm and the fourth arm are connected; a secondary-side full bridge circuit having a third arm circuit where a fifth arm at a high side and a sixth arm at a low side are connected in series and a fourth arm circuit where a seventh arm at a high side and an eighth arm at a low side are connected in series, the secondary coil being included in a bridge part that connects a connected point at which the fifth arm and the sixth arm are connected with a connected point at which the seventh arm and the eighth arm are connected; a control part controlling a first phase difference between switching of the first arm circuit and switching of the third arm circuit and a second phase difference between switching of the second arm circuit and switching of the fourth arm circuit in such a manner that power is transmitted from the secondary-side full bridge circuit to the primary-side full bridge circuit; and a current sensor measuring a current flowing through the secondary coil, wherein the control part corrects a turn-off timing of the fifth arm in such a manner that a first integral value acquired from integrating a measured value from the current sensor for a first integral interval approaches zero, or corrects a turn-off timing of the seventh arm in such a manner that a second integral value acquired from integrating the measured value from the current sensor for a second integral interval approaches zero, wherein a first interval denotes an interval between a turn-off timing of the first arm and a turn-on timing of the seventh arm, the first integral interval denotes an interval acquired from delaying the first interval by a response delay period of time of the current sensor, a second interval denotes an interval between a turn-off timing of the third arm and a turn-on timing of the fifth arm, and the second integral interval denotes an interval acquired from delaying the second interval by the response delay period of time of the current sensor.