Battery charging flashlight circuit

Details Battery charging flashlight circuit Battery charging flashlight circuit

H - Electricity

02

J

320/11, 320/2.5

H02J 7/02 (2006.01) H02J 7/00 (2006.01)

Patent

CA 1203279

ABSTRACT A flashlight has a built-in battery charging cir- cuit adapted to be plugged into an associated AC source, and a selector switch for selectively connecting the bat- tery 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 cur- rent flow from the bridge to the battery when the battery voltage reaches a predetermined level.

431339

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