VEHICULAR POWER SUPPLY DEVICE AND COOLING CIRCUIT

摘要

This cooling circuit (100) is provided with: a high-voltage-battery cooling unit (130) for cooling high-voltage batteries (31a-33a); a DC-DC converter cooling unit (122) for cooling a DC-DC converter (22); and a charger cooling unit (121) for cooling a charger (21). In the cooling circuit (100), the DC-DC converter cooling unit (122) and the charger cooling unit (121) are arranged in parallel at the downstream side of the high-voltage-battery cooling unit (130).