Patent ID: 7218076

Claim:
A battery charging system, comprising: a current source; a battery; a voltage and current regulator, which regulates voltage applied to said battery and current supplied to said battery, said voltage and current regulator comprising: an adjustable band-gap voltage reference diode, a voltage divider potentiometer, a resistor, and a transistor; said adjustable band-gap voltage reference diode in series with said resistor, said series resistor and said band-gap voltage reference diode connected across said current source and said battery, said adjustable band-gap voltage reference diode having a reference input; said voltage divider potentiometer connected across said current source and said battery, said voltage divider potentiometer having an output connected to said reference input of said adjustable band-gap voltage reference diode, and providing a reference input voltage at said reference input to said band-gap, voltage reference diode; said transistor having an emitter and a collector connected across said current source and said battery, said transistor having a base connected to a junction between said series connected resistor and said band-gap voltage reference diode, said band-gap reference diode, said series resistor, and said transistor operating in conjunction with one another to regulate voltage applied to said battery and current supplied to said battery, and an operational amplifier, which amplifies cutoff voltage and provides an output for use with auxiliary devices.