Power conversion device

A power conversion device, comprising:

• a bidirectional DC/DC converter connected to a battery;
• and
• a capacitor arranged at an input end of the bidirectional DC/DC converter, wherein
• the bidirectional DC/DC converter includes:
• a transformer including a primary-side winding and a secondary-side winding;
• a primary-side full-bridge circuit connected to the primary-side winding and including multiple primary-side switching elements;
• a secondary-side full-bridge circuit connected to the secondary-side winding and including multiple secondary-side switching elements;
• and
• a control circuit that outputs a primary-side control signal for switching on and off the primary-side switching elements and a secondary-side control signal for switching on and off the secondary-side switching elements, thereby converting an input voltage, input to the primary-side full-bridge circuit, into an output voltage, output from the secondary-side full-bridge circuit, and outputting the output voltage to the battery,
• a value obtained by multiplying a voltage of the battery by a turn ratio of the transformer is defined as a battery voltage primary-side conversion value, and
• the control circuit is configured to perform, during activation of the bidirectional DC/DC, at least one of a first phase shift control that outputs the primary-side control signal so that a positive voltage is applied to the primary-side winding, and then outputs the secondary-side control signal so that a positive voltage is applied to the secondary-side winding when a voltage of the capacitor is higher than the battery voltage primary-side conversion value, and a second phase shift control that outputs the secondary-side control signal so that a positive voltage is applied to the secondary-side winding, and then outputs the primary-side control signal so that a positive voltage is applied to the primary-side winding.