Sanyo Electric Co., Ltd.

Akira Matsumoto

Masaki Yugou

Hideki Sakata

Takeshi Oosawa

A power source apparatus of a car is provided with contactors () connected to an output-side of a battery (); a pre-charge circuit () made up of a series connected pre-charge resistor () and a pre-charge relay (), which is connected with a contactor () to supply auxiliary charge to a capacitor () connected to a car-side of the battery (); and a control circuit () to control the contactors () and the pre-charge relay (). The pre-charge resistor () is connected in parallel with a contactor (), and the pre-charge relay () is connected in series with that contactor (). The control circuit () switches the pre-charge relay () ON to pre-charge the car-side capacitor (), and then switches the contactor () ON to connect the battery () to the car-side.

Car power source apparatus

A current detection apparatus includes a current detection section that detects charging current and discharging current of the car driving battery, a level-shift circuit connected to the output-side of the current detection section that shifts the output of the current detection section, and an A/D converter connected to the output-side of the level-shift circuit. The level-shift circuit shifts the current detection section output signal to unbalance the maximum discharging current and maximum charging current that can be detected.

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Kakogawa, Japan

Akira Matsumoto