US 11,951,919 B2
In-vehicle power supply system
Yasuhiro Kominato, Makinohara (JP); and Sadaharu Okuda, Makinohara (JP)
Assigned to YAZAKI CORPORATION, Tokyo (JP)
Filed by Yazaki Corporation, Tokyo (JP)
Filed on Jul. 7, 2022, as Appl. No. 17/859,579.
Claims priority of application No. 2021-123530 (JP), filed on Jul. 28, 2021.
Prior Publication US 2023/0036795 A1, Feb. 2, 2023
Int. Cl. B60R 16/033 (2006.01); H02J 7/00 (2006.01); H02J 7/34 (2006.01)
CPC B60R 16/033 (2013.01) [H02J 7/0063 (2013.01); H02J 7/0068 (2013.01); H02J 7/345 (2013.01); H02J 2207/20 (2020.01)] 3 Claims
OG exemplary drawing
 
1. 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 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; and
a switch unit configured to control circuit connection between the capacitor and the first power supply line; and
a control unit configured to control the switch unit,
wherein the upper power supply unit, the capacitor, and an input of the step-down conversion unit are connected to the first power supply line,
wherein the main battery and an output of the step-down conversion unit are connected to the second power supply line, and
wherein the control unit is configured to:
control the switch unit to perform discharge of the capacitor in conjunction with switching of an ignition of the vehicle to OFF; and
control the switch unit to cause electric charge accumulated in the capacitor to be discharged in a case in which the power of the power supply is required to be supplied to at least a large electric power load while the ignition is in an ON state.