Tool/software:
Hello, experts and masters,
Based on the circuit of PMP20873(Totem-pole PFC), I designed the voltage feedback of positive/negative half cycle.
However, after actual voltage division, the waveform given to the ADC has negative voltage generated. (The yellow one of the right picture.)
I also used psim simulation to verify. (The gray one of the left picture.)
How can I solve this problem?
Assuming that the PMP20873 circuit design is not used for feedback, is there any other way to feedback the positive/negative half-cycle voltage without a transformer?
Note: The ground of the ADC feedback I designed is not connected to the ground of the PFC output.
Is this where the problem occurs?
