Phase-initiation control arrangement, particularly for a three-p

Details Phase-initiation control arrangement, particularly for a three-p Phase-initiation control arrangement, particularly for a three-p

1972-05-24

1976-03-23

Shoop, William M.

Electricity: power supply or regulation systems

Remote sensing

307252T, G05F 500

Patent

active

039463044

ABSTRACT:
The invention relates to a phase initiation control circuit for a three phase system which comprises three sets of blocking elements of the TRIAC type. Regulation is achieved by displacing the moment at which a control impulse is sent to each blocking element to render it conducting for the remainder of the half cycle. Associated with each phase is a continuously chargeable capacitor which, upon a predetermined voltage being reached, discharges to produce a control impulse and also is completely discharged through the collector emitter path of a junction transistor at the zero cross-over of the particular voltage phase. The capacitors are charged through charging transistors and are discharged to produce said control impulses through unijunction transistors and impulse transformers.

REFERENCES:
patent: 3437911 (1969-04-01), Gutzwiller
patent: 3487292 (1969-12-01), Tibbetts
G. E. SCR Manual, 4th Edition, pp. 189-191, 205-207; 1967.

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