Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1997-10-17
1999-03-02
Do, Diep N.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324427, 340636, G01N 27416
Patent
active
058776281
ABSTRACT:
A warning device for detecting power of a real time clock battery of a computer including a comparator which is connected in parallel to the battery which provides power to a real time clock. The positive input terminal of the comparator is coupled to the positive pole of the battery. The negative input terminal is coupled to the system power supply which is connected to a Zener diode. The Zener diode is in avalanch region to generate a voltage drop which forms a predetermined reference voltage. When the power of the battery is less than the reference voltage, a signal is sent to a chip set in order to generate a warning signal informing that the power will be used up.
REFERENCES:
patent: 4517517 (1985-05-01), Kinney
patent: 4521735 (1985-06-01), Kageyama et al.
patent: 5072103 (1991-12-01), Nara
patent: 5428252 (1995-06-01), Walker et al.
Do Diep N.
Twinhead International Corp.
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