% fonctionnes de commutation convertisseur triphasé six-step. Jesus Morales
% ELE4801. Machines et entraînements électriques.  Hiver 2018.
close all; clear; clc

f = 100;            w = 2*pi*f;         dt = 1e-6;
t = 0:dt:1/f;       N = length(t);
s1 = zeros(1,N);    s2 = zeros(1,N);    s3 = zeros(1,N);

for n=1:N
    theta = mod(w*t(n)+pi/3,2*pi);
    if theta < pi/3,            s1(n) = 1;      s3(n) = 1;
    elseif theta < 2*pi/3,      s1(n) = 1;
    elseif theta < pi,          s1(n) = 1;      s2(n) = 1;
    elseif theta < 4*pi/3,      s2(n) = 1; 
    elseif theta < 5*pi/3,      s2(n) = 1;      s3(n) = 1;
    elseif theta < 2*pi,        s3(n) = 1;
    end
end

figure
subplot(3,1,1); plot(w*t/(pi/3),s1); grid; ylim([-0.2 1.2]); title('s_1')
subplot(3,1,2); plot(w*t/(pi/3),s2); grid; ylim([-0.2 1.2]); title('s_2')
subplot(3,1,3); plot(w*t/(pi/3),s3); grid; ylim([-0.2 1.2]); title('s_3')