Triac control circuit

Details Triac control circuit Triac control circuit

1995-05-31

1997-01-07

Nguyen, Matthew V.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

327452, G05F 500

Patent

active

055920730

ABSTRACT:
A common and inexpensive integrated 555 timing circuit is used to vary the timing of triac firing pulses in response to a control voltage. A trigger pulse generator generates a pulse at each zero cross-over of an AC line. This pulse initiates a variable, one shot pulse generator which generates a rectangular pulse. The rectangular pulse terminates following a time interval which is controlled by the magnitude of a control input signal. A pulse forming circuit generates a triac firing pulse at the termination of the rectangular pulse from the one shot pulse generator.

REFERENCES:
patent: 4362988 (1982-12-01), Weimer
patent: 4977877 (1990-12-01), Dykstra
patent: 5194782 (1993-03-01), Richardson et al.
patent: 5270698 (1993-12-01), Hoyle et al.
patent: 5450521 (1995-09-01), Redlich
patent: 5471360 (1995-11-01), Ishikawa et al.
Harris Semiconductor "Linear & Telecom ICs", 1991, pp. 8-126-8-127.
National Semiconductor, "Special Purpose Linear Devices", 1989, pp. 9-33.
Ramshaw, R. S., "Power Electronics Semiconductor Switches", Chapman and Hall, 1993, p. 198.

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