Question

I need a MATLAB code that sets different firing angles for the positive and negative cycles of a sine wave. Furthermore, the positive and negative cycles may be clipped with different values. Also, is there a way to determine the total harmonic distortion of such signals through MATLAB?

Answer 1

close all,
clear all,
clc,

Fs=1000;
Freq = 10;
t=0:(1/Fs):1;

ClipingVoltage=0.83;
FiringAngle= [];
x=[];
Ig= 0.5;
Signal=[];
ClippedSignal=[];
FlagAngle=1;
for n=1:length(t)
x(n) = sin(2*pi*Freq*t(n));
Signal(n) = x(n);
FiringAngle(n) = (2*pi*t(n)*Freq);
if(x(n) >= Ig && FlagAngle==1), Angle=(FiringAngle(n)*180)/pi; FlagAngle=0; end
ClippedSignal(n)=x(n);
if(x(n) < Ig), Signal(n)=0; FiringAngle(n)=0; end
if(x(n) >= ClipingVoltage), ClippedSignal(n) = ClipingVoltage; end
if(x(n) <= -ClipingVoltage), ClippedSignal(n) = -ClipingVoltage; end
end
subplot(3,1,1); plot(x); grid on, title('Input Sine Wave -> Gate Voltage/Current');
subplot(3,1,2); plot(Signal); grid on, ylim([-1,1]);
title(strcat('Firing Angle at Vg (= ',num2str(Ig),' ) = ',num2str(Angle),' degree'));
%hold on,
subplot(3,1,3); plot(ClippedSignal); grid on, title(strcat('Clipped Signal at Cliping Voltage = ',num2str(ClipingVoltage)));

Input Sine Wave -> Gate Voltage/Current 0.5 800 200 600 1000 1200 Firing Angle at Vg (05) 32.4 degree 0.5 1200 600 800 1000 Clipped Signal at Cliping Voltage-0.83 0.5 0.5. 200400 600 800 1000 1200