pwm signal generation

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Rmzn
Rmzn 2011-4-17
hi; i want to generate i pwm signal for an inverter. For this, i have a sinus signal which has amplitude btw -5 and +5. But i need to chop its negative intervals. how can i implement this in digital signal processing tools? i will use this in f2808 dsp chip for generating triggering signals to the mosfets..

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Paulo Silva
Paulo Silva 2011-4-17
f=1e3;a0=0;AmpSin=5; %sample wave values
t0=0;tf=0.01;Ts=1e-6; %time vector and resolution
v=0;AmpPwm=1; %Pwm options, increase v for lower dutty-cycle
t=t0:Ts:tf; %create the time vector
fun=AmpSin*sin(2*pi*f*t+a0); %create the function
pwm=AmpPwm*(fun>v); %get the pwm
%plot it just to know if its working
clf
plot(t,fun)
hold on
plot(t,pwm,'r')
Alternative implementation in simulink
  2 个评论
Rmzn
Rmzn 2011-4-17
Thanks Mr Paula;
but i didnt mean this. i need this process in simulink model,i have a discrete sinusoidal Soruce which is used from "Signal Processing Toolbox". can you suggest sth to do this ??
thanks very much..
Paulo Silva
Paulo Silva 2011-4-17
I'm sorry but you only mentioned simulink now, please follow Arnaud suggestion or do the same thing I did with my code on simulink (it's just simple math and comparison blocks)

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Arnaud Miege
Arnaud Miege 2011-4-17
Use the Saturation block.
HTH,
Arnaud
  1 个评论
Rmzn
Rmzn 2011-4-17
thanks a lot Mr Arnoud.! That is what i was looking for :))

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