Circuit for preventing battery damage

Details Circuit for preventing battery damage Circuit for preventing battery damage

1999-02-02

2000-03-21

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

320135, H02J 700

Patent

active

060406828

ABSTRACT:
A circuit for disconnecting a battery from a battery powered load whenever he battery's output voltage drops below a specified battery cell voltage. The circuit includes a relay having a coil and a normally open contact which connects the battery to its load when the coil is energized. When the battery's output voltage drops below the specified battery cell voltage, which is about 1.8 volts per cell, the relay coil will de-energize disconnecting the battery from the load. A battery charger continuously charges the battery to maintain its output voltage. The relay coil is energized closing the relay contact when the battery charges to a predetermined charging voltage which is approximately 2.2 VDC per cell. Closing the relay contact again connects the battery to its load.

REFERENCES:
patent: 4721899 (1988-01-01), Weil
patent: 5691619 (1997-11-01), Vingsbo
patent: 5784268 (1998-07-01), Steffek et al.
patent: 5825099 (1998-10-01), Kwon

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