Power source apparatus for a car

摘要

The invention relates to a power source apparatus including a first switching element (8) for controlling the power feed in the direction from a high-voltage battery (6) to an inverter (5), and a second switching element (9) for the power feed in the direction from the inverter (5) to a low-voltage battery (7), and the voltage at the direct current side is controlled to be higher than that of the high-voltage battery (6) when a battery controller (12) for controlling the first and second switching elements (8, 9) breaks down.