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+//Tested on Windows 7 Ultimate 32-bit

+//Chapter 3 Semiconductor Diodes and Miscellaneous Devices Pg no. 99 and 100

+clear;

+clc;

+

+//Given Data

+

+Vin1=50;//input voltage in volts

+Vin2=75;//input voltage in volts

+Vz=15;//zener breakdown voltage in volts

+Pmax=1;//diode maximum power dissipation in watts

+R=3.9D3;//value of resistor in ohms

+Rload=3D3;//value of load resistance in ohms

+

+//Solution

+//With reference to Figure 3.32

+disp("Case (a)");

+disp("Vin=50V");

+Vbc=Vz;//voltage across diode in volts

+Vab=Vin1-Vbc;//voltage across resiston in volts

+I=Vab/R*1000;//battery current in milli-amperes

+Iload=Vbc/Rload*1000;//current through load in milli-amperes

+Iz=I-Iload;//current through diode in milli-amperes

+Izmax=Pmax/Vz*1000;//maximum current through diode in milli-amperes

+

+printf("\n Battery current I = %.2f mA\n Zenner current Iz = %.2f mA\n Load current Iload = %d mA",I,Iz,Iload)

+

+disp("Case (b)");

+disp("Vin=75V");

+Vbc=Vz;//voltage across diode in volts

+Vab=Vin2-Vbc;//voltage across resiston in volts

+I=Vab/R*1000;//battery current in milli-amperes

+Iload=Vbc/Rload*1000;//current through load in milli-amperes

+Iz=I-Iload;//current through diode in milli-amperes

+Izmax=Pmax/Vz*1000;//maximum current through diode in milli-amperes

+

+printf("\n Battery current I = %.2f mA\n Zenner current Iz = %.2f mA\n Load current Iload = %d mA",I,Iz,Iload)

+

+printf("\n\n Load current remains constant for any voltage input.");