H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/42
H02M 7/515 (2006.01)
Patent
CA 1192258
VARIABLE SINGLE PHASE INVERTER ABSTRACT OF THE DISCLOSURE A parallel inverter circuit for converting DC volt- age 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 recti- fiers (SCR's) connected in parallel across the primary wind- ing in reverse directions, and by a pair of additional wind- ings coupled to the inductor referred to above and including one such winding in series with one of the auxiliary recti- fiers 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 commu- tation, the other auxiliary rectifier conducts current to continue shorting across the primary winding of the trans- former to produce a zero voltage interval. A phase- adjustable gating means is provided for the auxiliary recti- fiers.
421376
Lortec Power Systems Inc.
Macrae & Co.
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