Control device of power supply circuit

A control device for a plurality of power supply circuits including power storage mechanisms and a plurality of relays, each of said power supply circuits including a circuit that has a first relay controlling electric conduction/non-conduction between a load and one electrode of the power storage mechanism and a resistor connected in series to said first relay, a second relay connected in parallel to said circuit, and a third relay controlling electric conduction/non-conduction between the load and another electrode of the power storage mechanism,

• said control device comprising:
• a voltage detection unit detecting a voltage value of said load;
• a processing unit performing a precharge process, upon power supply startup, by causing a conductive state of said first relay and said third relay before causing the conductive state of said second relay and said third relay in each of said power supply circuits, so that a capacitor provided in parallel to said load and being an object of the precharge process is charged up to a charging level in such a way that a failure does not occur in said power supply circuit when electric power is supplied without passing through said resistor, and that the charging level is lower than full charging;
• a full-charge processing unit fully charging said capacitor, after performing said precharge process, with the charging of the capacitor from said charging level lower than full charging to full charging divided in accordance with a charging rate of the capacitor, by sequentially using said second relay and said third relay in each of said power supply circuits;
• and
• a detection unit detecting immobility of any of said second relay and said third relay in each of said plurality of power supply circuits, before said capacitor is fully charged, based on at least one of the detected voltage value of the load and the charging rate of the capacitor.