Circuit for measuring discharging and charging current of a batt

Details Circuit for measuring discharging and charging current of a batt Circuit for measuring discharging and charging current of a batt

1992-05-27

1993-10-19

Strecker, Gerard R.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

320 48, 324433, 324429, 340636, G01R 3136, G01N 2742, H02J 704

Patent

active

052549518

ABSTRACT:
A current measuring circuit for measuring discharging current and charging current of a battery, which is selectively connected to a load and a charger. The current measuring circuit comprises a resistor connected in series with the battery having a sufficiently low resistance value as not to substantially restrain the output current from the battery and a differential amplifier for amplifying a potential difference between both ends of the resistor. By providing a switch for short-circuiting one input terminal and the other input terminal of the differential amplifier, an offset/drift voltage of the differential amplifier can be obtained. This offset/drift voltage is used for correcting the output voltage from the differential amplifier at the time of current measurement and, thereby, the discharging current and charging current of the battery can be measured accurately.

REFERENCES:
patent: 4823086 (1989-04-01), Whitmire et al.

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