stm32 pwm wave control

faraway_99

stm32 pwm wave control [Copy link]

As shown in the figure below, it is necessary to refer to the zero crossing point of Iab to control the output of Vg1 and Vg2 PWM waveforms; it is known that the frequencies of Vg1, Vg2, and Iab are the same; Vg1 and Vg2 have the same duty cycle, a phase difference of 180 degrees, and a duty cycle of 2/3; Requirements: The high level of the Vg1 PWM waveform needs to be symmetrical with the zero crossing point of Iab, and the phase of Vg2 lags 180 degrees relative to Vg1. Is there a good method for the above control? Please recommend and discuss.

maychang

"It is known that the frequencies of Vg1, Vg2, and Iab are the same" Vg1 and Vg2 are generated by your stm32, and their frequencies are controlled by you. How can you say "It is known that the frequencies of Vg1, Vg2, and Iab are the same"? You can only say "It is required that the frequencies of Vg1, Vg2, and Iab are the same".

maychang

If the green and purple lines in the waveform have nothing to do with the text in the first post, then you must first measure the lab signal for several cycles, calculate its average value, and then start outputting Vg1 and Vg2. During the output of Vg1 and Vg2, you also need to measure the lab zero crossing point and correct it once per cycle.