Power conversion apparatus

A power conversion apparatus comprising:

• a transformer including a primary side coil and a secondary side coil;
• a primary side full bridge circuit including a primary side first arm circuit, a primary side second arm circuit and a primary side magnetic coupling reactor, the primary side first arm circuit connecting a primary side first upper arm and a primary side first lower arm in series, the primary side second arm circuit connecting a primary side second upper arm and a primary side second lower arm in series, the primary side magnetic coupling reactor and the primary side coil provided in a bridge part connecting a midpoint of the primary side first arm circuit to a midpoint of the primary side second arm circuit;
• and
• a secondary side full bridge circuit including a secondary side first arm circuit, a secondary side second arm circuit and a secondary side magnetic coupling reactor, the secondary side first arm circuit connecting a secondary side first upper arm and a secondary side first lower arm in series, the secondary side second arm circuit connecting a second upper arm and a second lower arm in series, the secondary side magnetic coupling reactor and the secondary side coil provided in a bridge part connecting a midpoint of the secondary side first arm circuit to a midpoint of the secondary side second arm circuit;
• a primary side port including a first port, the first port provided between a primary side positive bus line and a primary side negative bus line of the primary side full bridge circuit;
• a secondary side port including a second port, the second port provided between a secondary side positive bus line and a secondary side negative bus line of the secondary side full bridge circuit;
• a control unit configured to adjust a phase difference between a switching timing of the primary side first arm circuit and switching timing of the secondary side first arm circuit and between a switching timing of the primary side second arm circuit and switching timing of the secondary side second arm circuit as a phase difference control such that a transmitted power between the primary side port and the secondary side port is adjusted, and
• the control unit-configured to adjust the a frequency of the switching of each of the primary side full bridge circuit and the secondary side full bridge circuit in accordance with a port voltage of at least one of the primary side port and the secondary side port during the phase difference control.