Ricoh Company, Ltd.

Seiichi Ishiduka

Masato Kobayashi

Hirohito Murate

A power supply device includes a power supply line, control circuitry, and a first switch. The power supply line supplies voltage from a first power supply unit to a load. The control circuitry controls voltage supply from the first power supply unit. The first switch is connected between a second power supply unit and the control circuitry. The control circuitry causes the first power supply unit to start the voltage supply on condition that the first switch is in a closed state and a voltage of the power supply line is not greater than a first threshold voltage, and causes the first power supply unit to start the voltage supply on condition that the voltage of the power supply line is not greater than a second threshold voltage higher than the first threshold voltage when the first switch changes from an open state to the closed state.

Growing community of inventors

Kanagawa, Japan

Seiichi Ishiduka