Power factor controller

Details Power factor controller Power factor controller

1981-05-01

1984-01-17

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Power-factor control

318798, H02P 540

Patent

active

044266090

ABSTRACT:
A power factor controller for a motor is of the type having a bidirectional triode thyristor and a circuit for sensing the voltage across the thyristor to determine the time by which the current lags the line voltage and for generating a signal voltage across an integrating capacitor that is inversely proportional to the current lag time. In addition, a voltage ramp generator produces a ramp voltage having a slope that increases as the lag time decreases. A sum of the signal voltage and ramp voltage is applied to the input of a threshold detector that triggers firing of the thyristor when a predetermined threshold is reached. The entire controller employs only five integrated switches or gates and two individual transistors, and power dissipation, size and cost are thereby minimized.

REFERENCES:
patent: 4297628 (1981-10-01), Hedges
patent: 4298834 (1981-11-01), Opfer
"Improved Power-Factor Controller" Marshall Space Flight Center, NASA Tech Briefs Summer 80.

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