Flashlight with battery life indicator module

Details Flashlight with battery life indicator module Flashlight with battery life indicator module

1988-02-12

1989-10-24

Husar, Stephen F.

Illumination

Self powered lamp

Rechargeable electrical source of with external connections

362208, 320 48, 340636, F21L 900

Patent

active

048766321

ABSTRACT:
A battery life indicator module that is mounted between a flashlight head assembly containing the light reflector and a battery casing assembly for holding the batteries is disclosed. The battery life indicator module contains an indicator, such as a light-emitting diode (LED). Internal to the battery life indicator module is a circuit which measures the battery level and activates the indicator to display the battery level. The module also provides the necessary electrical connection between the batteries and the light bulb of the flashlight. In the preferred embodiment, three LEDs are used to indicate various levels of charge. The monitoring circuit is activated by the ON/OFF switch of the flashlight so that power is not drained when the flashlight is not in use. The module has threads at its two ends for coupling to the flashlight head assembly and the battery casing assembly. The monitoring circuit contains a pair of voltage dividers for providing two voltages references. These references are provided to two comparators which also monitor the voltage level on the battery. The output of the comparators are provided to two of the LEDs, while the third LED is connected to the output of a NAND gate which has inputs from each of the comparators.

REFERENCES:
patent: 4575784 (1986-03-01), Diau
patent: 4638237 (1987-01-01), Fernandez
patent: 4800336 (1989-01-01), Mikami et al.

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