Remaining battery charge calculation system in electronic...

Details Remaining battery charge calculation system in electronic... Remaining battery charge calculation system in electronic...

2007-03-29

2010-10-05

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S134000, C324S429000

Reexamination Certificate

active

07808209

ABSTRACT:
An electronic device has a voltage converter configured to convert output voltage of a battery for supplying power for operating an electronic device into a preset voltage for output, a constant current load unit configured to receive the voltage output by the voltage converter and output a preset constant current, a battery voltage detector configured to detect the output voltage of the battery, and a remaining charge calculator configured to calculate the remaining charge of the battery based on a first battery voltage obtained by the battery voltage detector when operation of the constant current load unit is stopped and a second battery voltage obtained by the battery voltage detector when the constant current load unit is operating.

REFERENCES:
patent: 4438431 (1984-03-01), Toyomura
patent: 2005/0088138 (2005-04-01), Sasaki
patent: 2005/0225295 (2005-10-01), Sato
patent: 2004-150951 (2004-05-01), None
Raw Machine Translation of JP 2004-150951 (Yamada), May 27, 2004.

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