Triac failure detector

Details Triac failure detector Triac failure detector

1981-11-30

1983-08-23

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318729, 361100, 361 90, 363 54, H02P 540

Patent

active

044006578

ABSTRACT:
A failure detector is provided for detecting unidirectional failures in triacs, particularly as used in power factor controllers for induction motors. In a first embodiment, the triac voltage waveform is sensed and upon detection of an unbalanced signal, corresponding to failure of the triac in either the positive or negative direction, the triac is turned full on in both directions. In a second embodiment, a pair of pulsed signals are derived, the pulse durations of which are proportional to the phase difference between the load current and voltage for each half cycle, and the triac is turned full on responsive to a difference in pulse duration between the half cycle signals. An unidirectional open circuit detector is adapted to use a signal from either of the first and second embodiments to turn the triac off in response to an open circuit failure in either direction.

REFERENCES:
patent: 3737744 (1973-06-01), Bader, Jr.
patent: 4025836 (1977-05-01), Naito et al.
patent: 4355343 (1982-10-01), Gross
patent: 4361793 (1982-11-01), Nordell

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