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+// chapter 10
+// example 10.1
+// Determine required supply voltage, thyristor rating and power factor of the supply current
+// page-698-699
+clear;
+clc;
+// given
+m=3; // number of phases
+PF=0.7; // power factor (lagging)
+Edc=190; // in V (load voltage)
+I_L=45; // in A 
+// calculate
+// since Edc=(m/%pi)*Eph*sin(%pi/m), therefore we get
+Eph=Edc/((m/%pi)*sin(%pi/m)); // calculation of required supply voltage
+Eph_max=Eph*sqrt(2); // calculation of required supply voltage maximum value
+Imax=I_L*sqrt(2); // calculation of maximum value of cycloconvertor current
+Irms=Imax/sqrt(3); // calculation of thyristor rms current
+PIV=sqrt(3)*Eph_max; // calculation of peak inverse voltage
+Irms_1_3=sqrt(I_L^2/3); // calculation of rms current for one-third cycle
+Pin=(1/3)*Edc*I_L*PF; // calculation of input power per phase
+pf=Pin/(Eph*Irms_1_3); // calculation of power factor of the supply current
+printf("\nThe required supply voltage is \t\t\t Eph=%.2f V",Eph);
+printf("\nThe thyristor ratings are \t\t\t Irms==%.2f A \t PIV=%.2f V",Irms,PIV);
+printf("\nThe power factor of the supply current is \t pf=%.2f",pf);
+// Note: 1. The answers vary slightly due to precise calculation.
+\ No newline at end of file