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TRIAC/SCR proportional control circuit

United States Patent

5,892,391
April 6, 1999
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
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.
Hughes; Wallace J. (Boston Lake, NY)
The United States of America as represented by the United States (Washington, DC)
08/ 923,629
September 4, 1997
GOVERNMENT CONTRACT RIGHTS The invention described herein was made and/or conceived in the course of or under a contract of the U.S. Department of Energy, according to which the United States Government has rights in this invention and title thereto is in the Department of Energy.