Watthour meter or wattmeter comprising hall sensors

Details Watthour meter or wattmeter comprising hall sensors Watthour meter or wattmeter comprising hall sensors

1988-12-23

1990-11-20

Eisenopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324117H, G01R 2108

Patent

active

049721410

ABSTRACT:
A watthour meter or a wattmeter comprising Hall sensors and possessing a precise linearity of the conversion of low voltage into frequency within a broad dynamic range. The required linearity is achieved by providing a multiplication-adding circuit MS with a current output, to which the noninverting input of the last operational amplifier in the circuit is connected, by providing a current-frequency converter IFC with a differential integrator DI comprising an active compensation feedback circuit, by shunting the output and the input of the converter IFC by a compensation circuit CC to compensate the ripple, offset and charge injections of electronic switches, and by placing the Hall sensors so that the magnetic induction direction in the slits of a ferromagnetic yoke is different for each sensor of a pair of them.

REFERENCES:
patent: 4764720 (1988-08-01), Nystrom
patent: 4808918 (1989-02-01), Rozman
Analoge Integrierte Schaltungen, p. 288, M. Herpy, 1976.
Operational Amplifiers, pp. 155-156, G. B. Clayton, 1971.

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