Electricity: power supply or regulation systems – External or operator controlled – Phase controlled switching using electronic tube or a three...
Patent
1988-07-27
1990-01-02
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Phase controlled switching using electronic tube or a three...
323326, 323241, G05F 1455
Patent
active
048915718
ABSTRACT:
A control device for switching a thyristor in a circuit including an a.c. voltage source, which comprises firing signal circuit having an input for receiving control signals, an output for providing firing signals for a thyristor and a detector for detecting zero-crossings of an a.c. voltage provided by the a.c. voltage source. The firing signal circuit further comprises an accumulating circuit for accumulating the control signals and for providing a firing signal when both the detector detects a zero-crossing of the a.c. voltage and the value of the accumulated signals is equal to or exceeds a first predetermined value, and subtracting circuit for subtracting a second predetermined value from the value of the accumulated signals when the firing signal is provided.
REFERENCES:
patent: 3562625 (1971-02-01), Van Den Broek
patent: 3691452 (1972-09-01), Aguiar
patent: 3909703 (1975-09-01), Braddock
patent: 3990000 (1976-11-01), Digneffe
patent: 4287468 (1981-09-01), Sherman
patent: 4337509 (1982-06-01), Omae et al.
H. Dowalski, "Preparation Schwingungspaketsteuerung mit triacs", vol. 29, No. 7, Radio Fernsehen Elektronik, Jul. 1980.
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