Patent ID: 6605925
Filing Date: 2003-08-12
Classification: H02J

Abstract:
A rechargeable power source circuit comprising: a secondary battery; a switching circuit for controlling an amount of current flowing in the secondary battery; overcharge detecting means for detecting an overcharged state of the secondary battery and outputting a corresponding signal; overcurrent detecting means for detecting an overcurrent state of the secondary battery and outputting a corresponding signal; a logic circuit for receiving the output signals of the overcharge detecting means and the overcurrent detecting means and outputting signals for controlling the switching circuit; a battery charger detecting circuit for detecting when a battery charger is connected to charge the secondary battery; a transistor connected between a power source voltage and an overcurrent detecting terminal for allowing the overcurrent detecting terminal to return to a normal state from the overcurrent state when a load is disconnected from the secondary battery; and a diode connected in series with the transistor for preventing a current to flow from the battery charger to the secondary battery.