Patent ID: 11951919
Assignee: YAZAKI CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 1:
2. An in-vehicle power supply system configured to supply power of a power supply on a vehicle side to an in-vehicle device serving as a load on a vehicle, the in-vehicle power supply system comprising:
a main battery configured to charge and discharge the power of the power supply;
an upper power supply unit configured to supply the power of the power supply power to the main battery;
a first power supply line allocated to conduct the power of the power supply of a first voltage;
a second power supply line allocated to conduct the power of the power supply of a second voltage lower than the first voltage;
a step-down conversion unit configured to step down a voltage of the first power supply line to supply the power of the power supply to the second power supply line;
a capacitor;
a switch unit configured to control circuit connection between the capacitor and the second power supply line; and
a control unit configured to control the switch unit,
wherein the upper power supply unit, the main battery, and an input of the step-down conversion unit are connected to the first power supply line,
wherein an output of the step-down conversion unit and the capacitor are connected to the second power supply line, and
wherein the control unit is configured to:
control the switch unit to charge the capacitor in a case in which a predetermined condition is satisfied while an ignition of the vehicle is OFF; and
control the switch unit to perform discharge of the capacitor while the ignition is ON.