POWER CONVERSION APPARATUS

摘要

A full-bridge circuit has serial first arms and serial second arms. Another full-bridge circuit has serial third arms and serial fourth arms. Primary and secondary coils of a transformer are included, respectively, in a part connecting a middle point of the first arms and a middle point of the second arms and a part connecting a middle point of the third arms and a middle point of the fourth arms. A switching phase difference between the first arms and the third arms and a switching phase difference between the second arms and the fourth arms are adjusted, and transmission power between these full-bridge circuits is controlled. Connections of respective electrodes of a power source are inversely connected to respective polarity buses of the other full-bridge circuit. A phase of switching in one of the third and fourth arms other one having a short-circuit failure is inverted.

主权项

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.