POWER SUPPLY DEVICE

摘要

The purpose of the present invention is to provide a power supply device with high efficiency. The power supply device 1 of the present invention is provided with: a bidirectional DC-DC converter 3 that receives a main battery 5 and outputs a DC link voltage Vlink; and an insulation-type DC-DC converter 4 that receives the link voltage Vlink and supplies power to a load 7. The link voltage Vlink output from the bidirectional DC-DC converter 3 is changed according to the output voltage of the insulation-type DC-DC converter 4.