Patent ID: 9537414
Date: 2017-01-03
CPC Classifications: H02M

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 including a first upper arm and a first lower arm connected in series, and a second arm circuit including a second upper arm and a second lower arm connected in series, wherein the primary coil is included in a first bridge part that connects a first middle point between the first upper arm and the first lower arm and a second middle point between the second upper arm and the second lower arm; a secondary-side full-bridge circuit having a third arm circuit including a third upper arm and a third lower arm connected in series, and a fourth arm circuit including a fourth upper arm and a fourth lower arm connected in series, wherein the secondary coil is included in a second bridge part that connects a third middle point between the third upper arm and the third lower arm and a fourth middle point between the fourth upper arm and the fourth lower arm; and a control part that adjusts a first phase difference between switching in the first arm circuit and switching in the third arm circuit and a second phase difference between switching in the second arm circuit and switching in the fourth arm circuit, and controls transmission power transmitted between the primary-side full-bridge circuit and the secondary-side full-bridge circuit, wherein when a short-circuit failure is detected in one of the third upper arm and the fourth upper arm, the control part switches a connection of a positive electrode of a power source to a negative-polarity bus of the secondary-side full-bridge circuit, switches a connection of a negative electrode of the power source to a positive-polarity bus of the secondary-side full-bridge circuit, and inverts a phase of switching in one of the third arm circuit and the fourth arm circuit other than the one having the short-circuit failure.