AC adapter including differential comparator for tracking battery voltage during trickle charge

Year	Description
1992	Invention patented by Hai N. Nguyen on September 29th, 1992. Abstract: A differential input comparator for controlling the output voltage of an AC adapter to track the voltage of a rechargeable battery during trickle charge. An output voltage sensing circuit typically used to regulate the AC adapter output voltage at a maximum level is modified to regulate the output voltage at a minimum DC voltage approximately equivalent to a fully discharged battery plus a nominal voltage level. The differential input comparator is coupled to a current limiter coupled in the charge path of the battery and to the sense signal to provide a separate current path used to modify the voltage level of the sense signal. The differential input comparator regulates the voltage across the current limiter to the nominal voltage level by controlling the AC adapter output voltage through the sense signal during trickle charge of the battery.
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Invention: AC adapter including differential comparator for tracking battery voltage during trickle charge