Power conversion device
A control circuit performs at least one of a first phase shift control and a second phase shift control. The first phase shift control outputs a primary-side control signal so that a positive voltage is applied to a primary-side winding, and then outputs a secondary-side control signal so that a positive voltage is applied to a secondary-side winding when the voltage of the capacitor is higher than a battery voltage primary-side conversion value during activation of a bidirectional DC/DC. The second phase shift control 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.
1 . 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.
2 . The power conversion device according to claim 1 , further comprising:
an AC/DC converter that converts alternating-current power into direct-current power and outputs the direct-current power to the bidirectional DC/DC converter.
3 . The power conversion device according to claim 1 , wherein the control circuit is configured to perform the first phase shift control when the voltage of the capacitor is higher than the battery voltage primary-side conversion value, and to perform the second phase shift control when the voltage of the capacitor is lower than the battery voltage primary-side conversion value.
4 . The power conversion device according to claim 2 , wherein the capacitor is arranged between the AC/DC converter and the bidirectional DC/DC converter.