High-power ac voltage stabilizer

G - Physics – 05 – F

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323/31

G05F 1/20 (2006.01) G05F 1/30 (2006.01) G05F 1/44 (2006.01)

Patent

CA 1140991

17 48,805 ABSTRACT OF THE DISCLOSURE An injection transformer has a primary winding series connected with a pair of inverse parallel-connected thyristors between a pair of input terminals. A control circuit is connected across a pair of output terminals for firing the thyristors. The injection transformer has a secondary winding connected between one of the input terminals and one of the output terminals for producing an injection voltage. A filter has components presenting a high impedance to the harmonic frequencies of the injec- tion voltage and a low impedance to the fundamental fre- quency of the injection voltage, and has components pre- senting a high impedance to the fundamental frequency of the injection voltage and a low impedance to the harmonic frequencies of the injection voltage. The filter is connected such that the flow of current through the thy- ristors is limited, the harmonic frequencies are attenu- ated, and the fundamental frequency is added vectorially to an AC source voltage connectable at the input terminals thus providing a filtered, regulated, AC voltage across the output terminals.

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