Electronic ampere-hour meter

Details Electronic ampere-hour meter Electronic ampere-hour meter

1978-12-08

1981-04-28

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324111, 324118, 324428, G01R 2106

Patent

active

042648610

ABSTRACT:
An amp-hour meter for a load driven by direct current, such as an electric vehicle, comprises a modulator connected across a resistor in series with the load for amplitude-modulating a pulse train from a multivibrator translated by a demodulator into a unipolar voltage varying with the load current. A sampler converts this voltage into a train of output pulses, generated at a rate proportional to the voltage level, whose count is numerically displayed as a measure of current consumption. The multivibrator, the demodulator, an intervening amplifier, the sampler and the display unit are serially energized with stabilized voltage and reduced current via a supply network connected across the load, this network including a ballast lamp in series with a Zener diode.

REFERENCES:
patent: 2637820 (1953-05-01), McCreary
patent: 2663846 (1953-12-01), Gilbert
patent: 2897445 (1959-07-01), Goodale
patent: 2919408 (1959-12-01), Brown
patent: 2994825 (1961-08-01), Anderson
patent: 3041535 (1962-06-01), Cochran
patent: 3484681 (1969-12-01), Grady, Jr. et al.
patent: 3805157 (1974-04-01), Acks et al.
patent: 3971980 (1976-07-01), Jungfer et al.

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