I have been trying to find a good way to produce three phase PWM sine waves, and I was getting stuck on the concept while looking at the phase-to-phase PWM signals. But then I realized that it just required generating three sine waves on the AH/AL, BH/BL, and CH/CL bridge pairs. Also, the PWM values need to be offset by 1/2 the peak value. So I made a spreadsheet that illustrates the waveforms of the individual bridges to ground, as well as the phase-to-phase voltages A-B, B-C, and C-A. Here is the spreadsheet and graphs:

I plan to implement this on a PIC and will post source code and other details. Feel free to add suggestions and discussion.

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Member## PStechPaul

MemberI have been trying to find a good way to produce three phase PWM sine waves, and I was getting stuck on the concept while looking at the phase-to-phase PWM signals. But then I realized that it just required generating three sine waves on the AH/AL, BH/BL, and CH/CL bridge pairs. Also, the PWM values need to be offset by 1/2 the peak value. So I made a spreadsheet that illustrates the waveforms of the individual bridges to ground, as well as the phase-to-phase voltages A-B, B-C, and C-A. Here is the spreadsheet and graphs:

I plan to implement this on a PIC and will post source code and other details. Feel free to add suggestions and discussion.

Three_Phase_Sine_Waves.ods

http://enginuitysystems.com/pix/electronics/Three_Phase_Sine_Waves.ods

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