| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a relay-welding detection circuit that is configured to be high-impedance. <P>SOLUTION: The relay-welding detection circuit detects welding of relays RYP, RYN provided on a charging path from an external power supply PW to a first battery 14, and is provided with: a second battery 15 that can supply a welding-detection power supply independently of the external power supply PW; a transistor switch 17 that is a circuit in which there is substantially zero current flowing in from the external power supply PW side of the relays, and controls whether or not to supply the welding-detection power supply to the second battery 15 on the basis of the voltage at the external power supply PW side of the relays; and a control unit 18 that is electrically insulated from the transistor switch 17, and detects welding on the basis of whether or not the transistor switch 17 has supplied the welding-detection power supply. <P>COPYRIGHT: (C)2013,JPO&INPIT |
