Patent ID: 11876400
Assignee: YAZAKI CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 0:
1. A backup power-supply device comprising:
a capacitor that is configured to supply power to a first electronic device and is provided as a backup for a main power supply;
a charging circuit that is provided between the main power supply and the capacitor and is configured to turn on and turn off charging from the main power supply to the capacitor;
a discharging circuit that is provided between the capacitor and the first electronic device and is configured to turn on and turn off discharging from the capacitor to the first electronic device;
a control unit that is configured to control to turn on or turn off the charging circuit to charge the capacitor from the main power supply so that a voltage of the capacitor becomes constant at a target voltage and turns off the discharging circuit to stop discharging from the capacitor to the first electronic device in a case where the main power supply is normal when an ignition is turned on, and turns off the charging circuit to stop charging from the main power supply to the capacitor and turns on the discharging circuit to perform discharging from the capacitor to the first electronic device in a case where an abnormality occurs in the main power supply when the ignition is turned on; and
a first switch that is provided between a second electronic device and the capacitor,
wherein the control unit turns on the discharging circuit and the first switch and turns off the charging circuit after the ignition is turned off to perform discharging from the capacitor to the second electronic device and to stop charging from the main power supply to the capacitor.