Circuitry for portable lighting devices and portable rechargeable electronic devices
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United States of America Patent
Stats
-
Oct 27, 2009
Grant Date -
Mar 22, 2007
app pub date -
Sep 7, 2006
filing date -
Dec 7, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A portable rechargeable electronic device, such as a flashlight, with external charging contacts and a short protection circuit is disclosed. The short protection circuit electrically uncouples one of the exposed charging contacts from the rechargeable power supply for the device when the charging contacts are short circuited. The charging contact is uncoupled without opening the power circuit for the device; thus, the device can continue to operate while the charging contacts are shorted. The power supply for the device may be a rechargeable lithium-ion battery pack. A flashlight with a circuit for reducing the initial surge of current that is sent through the lamp filament when a flashlight is turned on is also provided. The circuit reduces the stresses placed on the lamp bulb when it is turned on, thereby extending the life expectancy of the lamp bulb. A flashlight with an electronic switch is also disclosed.
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