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From: Kopi on 14 Apr 2010 03:10
Hello!

I've made a space vector PWM model in Simulink which outputs duty cycles for three phases (say A, B, C or U, V, W).
Now I am stuck because I don't know how to convert duty cycles to times when phase is ON and OFF. (and use a center aligned PWM)

I've tried to made a timer with level 2-Sfunction and c - code (and clock_t) but didn't get it work =/

So how this problem is solved? I hope that description below helps to understand what I mean..

T = switching time (in seconds)
tA = duty cycle for phase A (percentages)

time_zero = (T - T * tA) / 2
time_one = T * tA

output = 0 ; when ( 0 < timer <= time_zero )
output = 1 ; when ( time_zero < timer <= (time_one + time_zero) )
output = 0 ; when ( (time_one + time_zero) < timer <= T )
then clear timer.

Is this possibel at all?

Thanks for help and sorry of my english skills =)

---- Kopi -----
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