Battery charging flashlight circuit
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United States of America Patent
Stats
-
Jul 17, 1984
Grant Date -
N/A
app pub date -
Aug 13, 1982
filing date -
Aug 13, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flashlight has a built-in passive battery charging circuit adapted to be plugged into an associated AC source, and a selector switch for selectively connecting the battery to the charging circuit or to the flashlight lamp. The charging circuit includes a transformer with a center-tapped secondary providing a high voltage at one set of terminals and a low voltage at another set of terminals. The high voltage is rectified by an LED and applied through a current-limiting resistor to the selector switch. The low voltage is full-wave rectified by a diode bridge, the output terminals of which are coupled to the selector switch. Also connected across the output terminals of the diode bridge is a Zener diode circuit for terminating current flow from the bridge to the battery when the battery voltage reaches a predetermined level.
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