Residual capacity indicating device

Details Residual capacity indicating device Residual capacity indicating device

1993-08-09

1995-05-02

Peckman, Kristine L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 48, H02J 700

Patent

active

054123070

ABSTRACT:
A residual capacity indicating device for indicating the residual capacity of a battery, the discharge voltage of which decreases when the same is discharged and the capacity of which increases with the increase of its temperature, comprises differential amplifiers for comparing the output voltage of the battery with reference voltages. LEDs are driven by the outputs of the differential amplifiers, respectively, according to the residual capacity of the battery to indicate the residual capacity of the battery. The reference voltages are determined by a combination of a Zener diode and a pair of resistors connected to each of the inverting terminals of the differential amplifiers. Since the Zener diode has a temperature characteristic opposite that of the resistors, the residual capacity of the battery can correctly be indicated regardless of the variation of the temperature of the battery.

REFERENCES:
patent: 4027231 (1977-05-01), Lohrmann
patent: 4052717 (1977-10-01), Arnold et al.
patent: 4080560 (1978-03-01), Abert
patent: 4426612 (1984-01-01), Wicnienski et al.
patent: 5105180 (1992-04-01), Yamada et al.
patent: 5124627 (1992-06-01), Okada

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