Charging voltage control circuit for battery chargers
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United States of America Patent
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-
Oct 19, 1993
Grant Date -
N/A
app pub date -
Dec 24, 1990
filing date -
Dec 24, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Charging voltage and current control circuits for battery chargers provide for a constant output voltage above a first predetermined value of charging current and an increasing output voltage below the first predetermined value of charging current. The charger makes use of a pulse-width modulated control circuit utilizing a variable duty cycle proportional to charging current and couples a signal proportional to charging current via a diode-resistor network to the pulse-width modulator for values below the first predetermined value of charging current. A current limit control circuit provides a current limit function by driving the pulse-width modulator to a minimum duty cycle during overcurrent conditions.
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