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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 3
+//example 3.12
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+f=500; //frequency at the load side in Hz
+t=1/f; //time for one cycle in sec
+tseg=t/6; //time of the switching segment in sec
+tcon=3*tseg; //conduction period of each transistor in sec
+tcon1=tcon*10^3; //conduction period of each transistor in msec
+disp(tcon1,'The conduction period of each transistor in msec is')