Weak battery warning circuit

Details Weak battery warning circuit Weak battery warning circuit

2006-05-15

2009-08-25

Le, Thanh C (Department: 2618)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S343100

Reexamination Certificate

active

07580688

ABSTRACT:
A weak battery warning circuit includes a warning circuit for generating an alarm; a battery having a cathode connected to ground; and a controlling circuit comprising a transistor, the transistor having an emitter for receiving an input voltage, a base connected to an anode of the battery via a base resistor, and a collector connected to the warning circuit and also connected to ground via a collector resistor. When the voltage of the battery reduces to a predetermined value, the controlling circuit controls the warning circuit to alarm.

REFERENCES:
patent: 3392379 (1968-07-01), Thomason et al.
patent: 5130633 (1992-07-01), Maruichi
patent: 5794125 (1998-08-01), Grad
patent: RE37281 (2001-07-01), Motegi

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