Battery state of charge metering method and apparatus

Details Battery state of charge metering method and apparatus Battery state of charge metering method and apparatus

1981-11-16

1985-12-24

Levy, Stewart J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

320 39, 320 48, 324428, 324435, 324436, 340636, G01N 2742

Patent

active

045609373

ABSTRACT:
The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit is provided for generating a series of voltage pulses on a single output line with each pulse corresponding in length to the binary digital value stored in the integrator to provide a time based resultant indication of the stored binary digital value. A filtering means is included to provide a substantially smooth analog output voltage having an amplitude corresponding to the summation of the pulses.
The system preferably includes a delayed high voltage reset feature to set the integrator to a full charge state in response to voltage levels accompanying charging of the battery.

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Fadrhons, J., "Simple Pulsewidth D/A Converter Accepts Bipolar Code", Electronic Engineering, Jan. 1974, p. 13.

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