Power supply device, control method of power supply device,...

Electricity: battery or capacitor charging or discharging – One cell or battery charges another

Reexamination Certificate

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C320S104000, C320S107000, C320S117000, C320S118000, C320S120000, C307S046000, C307S064000, C307S066000, C307S149000, C180S065100, C123S179300

Reexamination Certificate

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07839116

ABSTRACT:
In a power supply device of the invention, when the state of charge SOC1of a low-voltage battery is lower than a discharging reference value Shi1below a full charge level and when the state of charge SOC2of a high-voltage battery is not lower than a discharging reference value Slow2at a system-off time, the low-voltage battery is charged close to its full charge level with the electric power supplied from the high-voltage battery. The lead acid battery used for the low-voltage battery has the high potential for deterioration in the continuously low state of charge SOC. The lithium secondary battery used for the high-voltage battery has the high potential for deterioration in the continuously high state of charge SOC. The charge of the low-voltage battery in combination with the discharge of the high-voltage battery enables both the low-voltage battery and the high-voltage battery to have respective favorable states of charge with little potentials for deterioration. The technique of the invention thus effectively prevents quick deterioration of both the low-voltage battery and the high-voltage battery.

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