Power conversion device and power conversion method
A power conversion method of a power conversion device including a primary side port disposed in a primary side circuit and a secondary side port disposed in a secondary side circuit magnetically coupled to the primary side circuit with a transformer, the power conversion device adjusting transmission power transmitted between the primary side circuit and the secondary side circuit by changing a phase difference between switching of the primary side circuit and switching of the secondary side circuit, and changing a voltage of the secondary side port by a DC-DC converter connected to the secondary side port, the power conversion method including: monitoring a voltage ratio of a voltage of the primary side port and the voltage of the secondary side port; and causing the DC-DC converter to operate when the voltage ratio deviates from the reference value by the specified value or more.
1. A power conversion method of a power conversion device including a primary side port disposed in a primary side circuit and a secondary side port disposed in a secondary side circuit magnetically coupled to the primary side circuit with a transformer, the power conversion device adjusting transmission power transmitted between the primary side circuit and the secondary side circuit by changing a phase difference between switching of the primary side circuit and switching of the secondary side circuit, and changing a voltage of the secondary side port by a DC-DC converter that is connected to the secondary side port, the power conversion method comprising:
monitoring a voltage ratio of a voltage of the primary side port and the voltage of the secondary side port;
determining whether the voltage ratio deviates from a reference value by a specified value or more; and
causing the DC-DC converter to operate when the voltage ratio deviates from the reference value by the specified value or more.
2. The power conversion method according to claim 1 , wherein the voltage of the secondary side port is maintained to be a value within a specified range.
3. The power conversion method according to claim 1 , wherein the voltage ratio is dependent on the voltage of the secondary side port.
4. The power conversion method according to claim 1 , wherein elements included in the DC-DC converter and components included in the primary side circuit and the secondary side circuit are shared.
5. A power conversion device comprising:
a primary side circuit including a primary side port;
a secondary side circuit including a secondary side port and being magnetically coupled to the primary side circuit with a transformer;
a control unit controlling transmission power transmitted between the primary side circuit and the secondary side circuit by changing a phase difference between switching of the primary side circuit and switching of the secondary side circuit; and
a DC-DC converter that is connected to the secondary side port and changes a voltage of the secondary side port,
wherein the control unit is configured to
monitor a voltage ratio of a voltage of the primary side port and the voltage of the secondary side port;
determine whether the voltage ratio deviates from a reference value by a specified value or more; and
cause the DC-DC converter to operate when the voltage ratio deviates from the reference value by the specified value or more.
6. The power conversion device according to claim 5 , wherein the voltage of the secondary side port is maintained to be a value within a specified range.
7. The power conversion device according to claim 5 , wherein the voltage ratio is dependent on the voltage of the secondary side port.
8. The power conversion device according to claim 5 , wherein elements included in the DC-DC converter and components included in the primary side circuit and the secondary side circuit are shared.