Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1991-12-02
1994-06-21
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307632, H01H 3500
Patent
active
053230620
ABSTRACT:
A trigger control circuit of the kind wherein a load is supplied via a triac with current from an AC voltage supply source under the control of a triac control means in combination with a sensing element. In previous circuits the sensing element is energized by a current from a DC source which is derived by rectification and smoothing of the alternating current of an alternating voltage supply source. These circuits have limitations in integrated circuitry. The sensing element herein is energized by an alternating current to produce a sensed alternating current. The triac control means includes an integration element for producing a control signal which represents of the integral of the difference between a value corresponding to the magnitude of the sensed alternating current and a reference value. The triggering or otherwise of the triac is determined by a latch actuated in response to the magnitude of the control signal relative to one or more threshold levels. The trigger control circuit may be used in thermostats or other sensing devices.
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patent: 3679873 (1972-06-01), Bray et al.
patent: 4172982 (1979-10-01), Kompelien
patent: 4590363 (1986-05-01), Bernard
patent: 4777350 (1988-10-01), Crockett et al.
"RCA Silicon Power Circuits Manual"; RCA-Electronic Components and Devices Division; 1967; pp. 240-243.
"RCA Transistor Thyristor and Diode Manual"; RCA-Solid State Division; 1971; pp. 213-221.
Crawford John S.
Kay Malcolm J.
Tracy Philip A.
Fleming F. M.
Franzblau Bernard
Pellinen A. D.
U.S. Philips Corporation
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