Pulse width modulator for electronic watthour metering

Details Pulse width modulator for electronic watthour metering Pulse width modulator for electronic watthour metering

1984-03-19

1986-05-27

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

324107, 324118, 324142, 332 9T, 375 22, H03K 700

Patent

active

045918104

ABSTRACT:
A pulse width modulator for an electronic kilowatt-hour meter includes an integrator having its inputs connected to a square wave clock signal and a sine wave signal proportional to the time derivative of current on the metered circuit. A plurality of series-connected inverters are connected to the output of the integrator to function as a comparator which generates a pulse width modulated signal having a duty cycle proportional to metered current. A negative feedback path including a low pass filter is connected between the output of the last inverter and an input to the integrator to compensate for errors produced by the integrator and inverters, thus permitting the use of low cost inverters fabricated on an integrated circuit.

REFERENCES:
patent: 4182983 (1980-01-01), Heinrich et al.
patent: 4250552 (1981-02-01), Elms
patent: 4315212 (1982-02-01), Gamoh
patent: 4368424 (1983-01-01), Miller

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