tsan500
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Perhaps the capacitor voltage floats when referred to earth potential. I made an illustration (illustration is modified from image shown here https://www.electronics-tutorials.ws/diode/diode_6.html).Looking to picture posted on Post #3, could you please explain to me why when power rectifier's diodes conduct, the midpoint voltage of the DC link varies respect to the negative rail of control board's power supply while DC link voltage is constant?
Red color show the situation during positive peak and blue color is for negative peak.
How much your DC link midpoint voltage varies?