I'm trying to generate a phase shift PWM signal but no luck , I've followed this video

, I always get different results , especially he uses a library of a summer .
any one knows how to generate phase shift pwm signals. Thx!

 

hi AKA,
Welcome to AAC.
Please post your LTS asc file.
E

 

Hi, Thx for your help. I've attached the simulation file

 

hi AKA,
As you say, he is using a Summing Model, is the Lib file for this Σ on his website.?

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hi AKA,
As you say, he is using a Summing Model, is the Lib file for this Σ on his website.?

E

There is no website , he just show some demonstration on youtube, but no specification on the symbol of summing and no no specification on duty 2.Thx!

 

hi,
Look at these alternative ideas for PWM generation.
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Added:
https://techdocs.altium.com/display/AMSE/SUM+-+Summer+(Single-Ended+IO)

 

I've created a sum function based on the doc posted in #6.
Files attached.

 

What's the difference between phase-shift PWM and normal PWM?

 

What's the difference between phase-shift PWM and normal PWM?

the PWM signal is always 50% and it's the same PWM signal but with added phase (0-360°) , in this example, the phase is proportional to the duty cycle.

 

I've created a sum function based on the doc posted in #6.
Files attached.

View attachment 241769

Thx! , I'll try it.

 

What's the difference between phase-shift PWM and normal PWM?

the PWM signal is always 50% and it's the same PWM signal but with added phase (0-360°) , in this example, the phase is proportional to the duty cycle.

Then that's obviously not PWM (Pulse Width Modulation), it's phase shift modulation, an entirely different animal.

 

See

 

the PWM signal is always 50% and it's the same PWM signal but with added phase (0-360°) , in this example, the phase is proportional to the duty cycle.

? If the PWM duty cycle is a constant 50%, then by this definition the phase will also be constant.

 

Thx! , I'll try it.

I've modified your sim as an attempt to duplicate the video.
Files attached.

 

If the PWM duty cycle is a constant 50%, then by this definition the phase will also be constant.

The duty-cycle may momentarily change slightly when the phase is changed, but certainly you can have a 50% duty-cycle with a phase different from a reference signal of the same frequency (such as a PLL extraction of the clock frequency).
Seems similar to phase-shift-keying (PSK) modulation.