By M. Ramamoorty
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Additional info for An Introduction to Thyristors and Their Applications
Communications and Electronics), 1960, p. 699. , The ratings ofSCRs when switching into high currents, IEEE Trans. (Communications and Electronics), 1963, p. 575. Newsam, B. al resistance: Its measurement and use in the rating of thyristor, lEE Conference Publication, No. 53, 1969, p. 85. Reed, J. , Dyer, R. , Power thyristor rating practices, Proc. IEEE, 1961, p. 1288. Rice, J. , Nickels, L. , Commutation dv/dt effects in thyristor 3-phase bridge converters, IEEE Trans. (lOA), 1968, p. 665. 1 SERIES-PARALLEL OPERATION OF SCRs Silicon-controlled rectifiers are now available with a voltage rating upto 10 kV and a current rating upto 1200 A.
More details on the on-off control scheme are given in Chapter 10. Transformer T can be introduced as shown in Fig. 2. I 2a to isolate the control circuit from the main power circuit if AC or pulse-firing is used for the gate drive. Diode D1 prevents negative source current and diode D2 limits the reverse voltage across the gate and the cathode. 12b shows a unijunction transistor (UJT) relaxation oscillator where the output pulses are coupled to the SCR gate through the isolation transformer T.
The capacitor 46 AN INTRODUCTION TO THYRISTORS AND THEIR APPLICATIONS discharges t~rough the triac gate. When the triac fires, the voltage drop across AB wlll be zero and the capacitor voltage will be reset to zero. A A Load R B Fig. 2 Diac phase-controlled circuit. similar operation takes place in th,e negative half-cycle, and a negative gate pulse will be applied when the diac breaks down in the reverse direction. By varying resistance R, the charging rate of capacitor C can be changed and thus the :firing angle can be controlled.