Single phase, double-ended thyristor inverter with choke-coupled

Details Single phase, double-ended thyristor inverter with choke-coupled Single phase, double-ended thyristor inverter with choke-coupled

1982-06-07

1984-06-19

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 75, H02M 7515

Patent

active

044556004

ABSTRACT:
A parallel inverter circuit for converting DC voltage to a variable AC voltage. One terminal of the DC source is connected to an inductor and, in turn, through a pair of gate-controlled, main rectifiers (SCR's), to the opposite ends of a transformer primary winding. A center tap of the primary winding is connected to the other terminal of the DC source. A commutating capacitance is connected across the transformer primary winding and a means is provided for alternately gating the rectifiers. The level of the voltage wave generated across the primary winding of the transformer is varied by means of two gate-controlled, auxiliary rectifiers (SCR's) connected in parallel across the primary winding in reverse directions, and by a pair of additional windings coupled to the inductor referred to above and including one such winding in series with one of the auxiliary rectifiers and another winding in series with the other auxiliary rectifier. The auxiliary rectifiers are gated so that one initially opens a circuit path bypassing the previously gated main rectifier as that rectifier is commutated. After commutation, the other auxiliary rectifier conducts current to continue shorting across the primary winding of the transformer to produce a zero voltage interval. A phase-adjustable gating means is provided for the auxiliary rectifiers.

REFERENCES:
patent: 3343065 (1967-09-01), Gurnett
patent: 3418559 (1968-12-01), Rolfes
Int. J. Electronics, Dec. 1980, vol. 49, No. 6, pp. 503-512.

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