Battery type and temperature identification circuit

Details Battery type and temperature identification circuit Battery type and temperature identification circuit

1993-05-17

1996-02-06

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 39, H02P 904, H02P 1100

Patent

active

054898340

ABSTRACT:
A battery identification circuit for determining the temperature and the type of a battery used in an electrical apparatus such as a portable radio telephone. The temperature and the type of a battery of the apparatus are measured with the help of an analog to digital converter. The voltage specifying the temperature is scaled to different voltage levels according to the type of battery. The temperature measurement algorithm is selected according to the present voltage level. The battery temperature is detected by measuring the voltage drop across a negative temperature coefficient (NTC) first resistor. The measured voltage is scaled to different levels by a second resistor to provide an identification of the battery type.

REFERENCES:
patent: 3667026 (1972-05-01), Bogut et al.
patent: 4006396 (1977-02-01), Bogut
patent: 4746852 (1988-05-01), Martin
patent: 5063340 (1991-11-01), Kalenowsky
patent: 5153496 (1992-10-01), LoForge
patent: 5252906 (1993-10-01), Busson
patent: 5309080 (1994-05-01), Odendahl et al.
patent: 5332957 (1994-06-01), Lee

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