Battery charger with Vbe temperature compensation circuit
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Jul 21, 1988
filing date -
Jul 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery charger supplies to a battery an output voltage having a desired temperature coefficient of voltage. The charger includes an operational amplifier having a summing junction to which a reference current and a feedback signal derived from the amplifier output are supplied. The V.sub.be multiplier circuit includes a bipolar transistor which is biased into its active region so that the charging voltage supplied by the amplifier is temperature corrected in accordance with a negative coefficient of voltage characteristic of the transistor.
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