The waveforms have nothing to do with full bridge or PWM. What you see is a trivial inrush current effect. Why do you worry about it?The voltages of graph 1 and 2 doesn't look right. Why?
Apparently you have been talking about waveforms:I am not talking about waveforms.
Anyway, I guess we should ignore the inrush current point for the time being.The voltages of graph 1 and 2 doesn't look right. Why?
Yes, if the right half bridge shall be driven with the inverted waveform of the left half bridge.My issue is can PWM1H1 and PWM1Li signals enough to drive the Full-Bridge of course using the IR2112.
They do, peak voltage V(P1)-V(P2) is 325 V. Think again.Yes, regarding graphs I had mentioned about incorrect voltages for the top 2 graphs. The graphs have to show the peak values for the 220 V RMS.
Using a low pass filter.I need a 50kHz sine wave output. If SPWM is not used then how can I get sine wave output?
It's the very edge situation.I want 50 kHz sine voltage output and PWM frequency will be 100 kHz.
Hi,
Usually the PWM_frequency to sine_frequency rate should be higher than 20. Makes just 5 different duty_cycle values.
If you want to get an fairly clean SPWM up to 30th overtone, one should consider a PWM frequency of 2 x 50Hz x 30 = 3000Hz.
For sure elaborated analog filters will have a big influence.
Klaus
You mean 3 MHz PWM? Impossible with high voltage Si MOSFET. Might work with GaN, but that's completely different (and very demanding) technology. For the said purpose there are probably more simple ways than MHz PWM.3000Kz = 3kHz PWM can give 50kHz sine wave output? Actually I want 20kHz to 50kHz variable sine wave output.
What are the more simple ways to achieve my requirements.
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