Patent ID: 8476862

Claim:
A power supply controller comprising: an inverter connected to a rotating electrical machine; a fuel cell connected in parallel with a pair of power lines, the pair of power lines being a positive bus bar and a negative bus bar of the inverter; a secondary battery connected in parallel with the pair of power lines; a voltage converter connected in parallel with the pair of power lines, and arranged connected between the fuel cell and the secondary battery; and relay members, provided in the pair of power lines at the output side of the fuel cell, for connecting or disconnecting between the fuel cell and the inverter, and between the fuel cell and the voltage converter, and a control section which includes: a locked state acquisition part that acquires whether or not the rotating electrical machine is in a locked state; a fuel cell control part that, when the rotating electrical machine is in a locked state, changes the output voltage of the fuel cell so as to become a predetermined specified low voltage from a normal control voltage state when the rotating electrical machine is not in a locked state; a voltage converter control part that, when the rotating electrical machine is in a locked state, changes using operation control of the voltage converter an inverter input voltage, which is a voltage across the pair of power lines, from a normal control voltage state when the rotating electrical machine is not in a locked state, to a specified low voltage state where the inverter input voltage is lowered to a predetermined low voltage; and a relay state changing part that changes the relay members from a connected state to a disconnected state when the rotating electrical machine goes from a state where it is not locked to a locked state, so that emission current due to a capacitive component of the fuel cell is not generated, even when the inverter input voltage is lowered.