Improved circuitry for portable lighting devices and...

G - Physics – 05 – F

Patent

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Details

G05F 1/00 (2006.01) H02H 3/00 (2006.01)

Patent

CA 2588308

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.

Dispositif électronique portable rechargeable tel qu'une lampe de poche, qui comporte des contacts de charge externes et circuit de protection contre les courts-circuits. Le circuit de protection contre les courts-circuits découple électriquement l'un des contacts de charge exposés de l'alimentation en puissance rechargeable du dispositif lorsque les contacts de charge subissent un court-circuit. Le contact de charge est découplé sans ouverture du circuit de puissance du dispositif, par conséquent le dispositif peut continuer à fonctionner tandis que les contacts de charge subissent le court-circuit. L'alimentation en puissance du dispositif peut être une pile rechargeable au lithium-ion. Une lampe de poche pourvue d'un circuit destiné à réduire la surtension initiale de courant envoyée dans le filament de la lampe lorsque la lampe de poche est allumée est également décrite. Le circuit réduit les stress subis par l'ampoule de lampe lors de l'allumage, ce qui prolonge la durée de vie de l'ampoule de lampe. Une lampe de poche pourvue d'un interrupteur électronique est également décrite.

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