Battery remaining amount warning circuit

Details Battery remaining amount warning circuit Battery remaining amount warning circuit

2005-06-21

2005-06-21

Tso, Edward H. (Department: 2838)

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

Reexamination Certificate

active

06909288

ABSTRACT:
It is an object of the present invention to provide a battery remaining amount warning circuit capable of issuing a battery remaining amount warning after battery power is fully used, consuming less power and issuing a warning at appropriate timing for various types of battery. The A/D converter measures a voltage value of the battery and when the voltage value of the battery falls to a specified level due to consumption, etc., of the battery, the A/D converter intermittently feeds the dummy-load circuit with a difference current representing a difference between a current value in a specific operating mode and a current value in another operating mode, measures the voltage of the battery and detects a voltage drop of the battery. When the difference current flows into the dummy-load circuit, a load applies to the battery the moment the current flows, causing a voltage drop.

REFERENCES:
patent: 4356481 (1982-10-01), Kuki
patent: 5969529 (1999-10-01), Eiraku et al.
patent: 55-136818 (1980-10-01), None
patent: 63-3538 (1988-01-01), None
patent: 2000-56370 (2000-02-01), None

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