By M. Ramamoorty
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Additional info for An Introduction to Thyristors and Their Applications
With positive voltage Vb applied between b2 and bt (Fig. 3a), the potential of point C will be '1Vb, where '1, referred to as the intrinsic standoff ratio, is determined by the relative magnitudes of the internal resistances R2 and Rt, respectively, of top (base 2) and bottom (base 1) regions of the device. As long as the emitter voltage Ve is less than the potential of C, the emitter-base I diode will be reverse-biased and emitter current ie will be negative and equal in magnitude to the reverse leakage current as shown by curve PR in Fig.
Here, the supply is given to the load for some time, called the on-time, and is cut off during the off-time. By controlling the on-time and off-time durations, power control is obtained. The circuit for this type of control is shown enclosed THYRISTORS 27 by dashed lines in Fig. 10a. A fixed value for R is used. A saturablecore reactor is shown as T1 in Fig. 10a. The negative current through the primary winding of T1 is prevented by diode D2. Thus, the positive half-cycle of the applied voltage raises the flux level in the core, and after a few cycles the core will be saturated.
14 shows the electrical equivalent of the thermal circuit. Capacitor C1 corresponds to the thermal capacity of the junction. The 1j - Tc = Pd avRs, Heat input Junction--. J +,_____-" C~Caslng Fig. 14 Electrical equivalent of thermal circuit. thcrm~l resistance between the junction and casing is R.. Cc and Rc are THYRISTORS 31 the thermal capacity and thermal resistance, respectively, of the surrounding medium. The heat input is represented by a current source. When the potential of node J is such that the current through Re is equal to the input current, the steady state is reached.