Power supply device
An object of the present invention is to provide a highly efficient power supply device. A power supply device 1 according to the present invention includes a bidirectional DC-DC converter 3 and an insulated DC-DC converter 4 . The bidirectional DC-DC converter 3 receives a main battery 5 and outputs a direct-current link voltage Vlink. The insulated DC-DC converter 4 receives the link voltage Vlink and supplies power to a load 7 . The link voltage Vlink, which is an output of the bidirectional DC-DC converter 3 , changes according to the output voltage of the insulated DC-DC converter 4.
1. A power supply device comprising:
a direct current to direct current (DC-DC) converter configured to supply power to a low voltage line; and
a chopper configured to receive a voltage of a high voltage battery and output a link voltage to be input to the DC-DC converter,
wherein the link voltage is changed according to a voltage of the low voltage line, and
wherein a control response speed of the link voltage with respect to a voltage fluctuation of the low voltage line is slower than a fluctuation of the high voltage battery.
2. The power supply device according to claim 1 ,
wherein the DC-DC converter is of an insulation type.
3. The power supply device according to claim 1 ,
wherein the chopper is able to convert power bidirectionally.
4. The power supply device according to claim 1 ,
wherein while the chopper performs a step-up operation, the link voltage is changed according to the voltage of the low voltage line.
5. The power supply device according to claim 4 ,
wherein when a target value of the link voltage is lower than the voltage of the high voltage battery, the chopper fixes a switching state and performs a through operation that brings the link voltage close to the voltage of the high voltage battery.