Patent ID: 6798175
Filing Date: 2004-09-28
Classification: H02H,H02J

Abstract:
A power supply circuit which is connected to a battery having an overcurrent protective device, said power supply circuit comprising:a capacitor which is connected in parallel to said battery to be charged by said battery; a voltage detector which detects a terminal voltage across said capacitor; and a restricting device that includes a variable resistor via which said battery is connected to said capacitor, and a controller which controls said output current of said battery by varying a resistance value of said variable resistor in accordance with said terminal voltage detected by said voltage detector, said restricting device restricting an output current of said battery so that said output current of said battery is not interrupted by said overcurrent protective device while said capacitor is being charged with said battery, wherein said variable resistor comprises a plurality of resistors and a corresponding group of switches for switching ON/OFF states of said plurality of resistors.