Thyristor circuit for current regulation

Electricity: power supply or regulation systems – External or operator controlled – Using a transformer or inductor as the final control device

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323209, 323258, G05F 132

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active

046396624

ABSTRACT:
A thyristor circuit including a primary winding and at least one secondary winding and first and second bipolar thyristor switches connected across respective connections of the secondary winding. The first bipolar thyristor switch bridges N.sub.1 turns of the secondary winding, while the second bipolar thyristor switch bridges N.sub.2 turns of the secondary winding, wherein N.sub.2 is less than N.sub.1. The product between the maximum forward current of the second bipolar switch and the number of turns N.sub.2 is greater than the product between the latching current of the first bipolar thyristor switch and the number of turns N.sub.1 thereof. The second bipolar thyristor switch thus makes it possible to short-circuit the portion of the secondary winding bridged thereby, for operation as a switchable choke, e.g. in a reactive compensator, or as a variable power supply when supplemented by additional components. The second bipolar thyristor switch which bridges a smaller number of windings than the first bipolar thyristor switch expands the operational range of the thyristor circuit and finds particular utility in providing a regulated d.c. power supply.

REFERENCES:
patent: 3195038 (1965-07-01), Fry
patent: 3955134 (1976-05-01), Woodford
patent: 4173039 (1979-10-01), Sun et al.
patent: 4503380 (1985-03-01), Thanawala
patent: 4560917 (1985-12-01), Gyugyi

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