TRIAC/SCR proportional control circuit

Details TRIAC/SCR proportional control circuit TRIAC/SCR proportional control circuit

1997-09-04

1999-04-06

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327447, 327451, H03K 1772

Patent

active

058923918

ABSTRACT:
A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage-to frequency converter controls the "reset" input of a R-S flip flop, while an "0" crossing detector controls the "set" input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the "reset" and "set" inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations.

REFERENCES:
patent: 4860149 (1989-08-01), Johnston

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