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+//Finding the minimum width of a gate pulse for a thyristor converter
+//Example 17.4(Page No-777) 
+clc
+clear
+//given data
+Ih=500*10^-3//holding current in A
+td=1.5*10^-6//delay time in sec
+a=30*%pi/180//alpha is a delay angle in radians
+L=10*10^-3//load L in H
+R=10//load R in ohms
+V=120//supply voltage in V
+f=60//supply freq in Hz
+Vm=sqrt(2)*V//maximum voltage value in V
+wt=a
+V1=Vm*sin(wt)
+di=V1/L//di is rate of rise of anode current at instant of triggering
+t1=Ih/di//time req by current to reach to holding current value
+tg=(t1+td)*10^6//in microsec
+printf('minimum width of gate pulse tg:%.2f microsec\n',tg)