Electronic watthour meter

Details Electronic watthour meter Electronic watthour meter

1981-12-23

1984-10-02

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324107, G01R 1132

Patent

active

044750811

ABSTRACT:
An electronic watthour meter includes a power flow direction detector circuit which detects the power flow direction and a pulse width modulation circuit for converting a voltage signal proportional to the load voltage into a pulse signal. In accordance with the output of the power flow direction circuit, the polarity of the output signal of the pulse width modulation circuit is either inverted or not inverted. A multiplication circuit produces the product of the voltage signal proportional to the load voltage and a voltage signal proportional to the load current under the control of the output of the pulse modulation circuit.

REFERENCES:
patent: 2900605 (1959-08-01), Squires et al.
patent: 3731190 (1973-05-01), Schwendtner
patent: 4058768 (1977-11-01), Milkovic
patent: 4315212 (1982-02-01), Gamoh

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