Patent ID: 6163136
Filing Date: 2000-12-19
Classification: H02J

Abstract:
A circuit for charging a battery comprising:a) an oscillator for providing a periodic waveform voltage;b) a switch having an open state and a closed state, said switch receiving said periodic waveform and selectively passing said waveform therethrough when said switch is in said open state;c) a converter for converting said periodic waveform to direct current for charging the battery;d) a comparator for activating said switch;e) a current limiter for detecting a return current from the battery, wherein said current limiter controls said comparator to turn off said switch if a return current is detected;f) a first differential amplifier for determining whether a supply voltage charging the battery drops below a threshold, wherein said differential amplifier controls said comparator to turn on said switch when said voltage supplied to charge the battery drops below the threshold; andg) a cable loss compensator for controlling said differential amplifier.