Inverter building using Wiseguys Power board and the Nano drive board


Author Message
analog8484
Regular Member

Joined: 11/11/2021
Location: United States
Posts: 97
Posted: 05:04pm 11 May 2024      

  wiseguy said  
I dont use an Iron cored transformer and the usual bridge rectifier and electrolytic that was typically used before.

This Nano controller uses the ZMPT107-1 2mA/2mA miniature transformer which is used for AC voltage sense, the secondary feeds a precision full wave rectifier and there is minimal filtering along the feedback path combined with a low pass filter at the voltage feedback input of the Nano.



Thanks for the clarification.  I have used the ZMPT107 and ZMPT101B and they are both quite good, especially for the price.  The only notable issue I have seen is there can be significant unit to unit variance.  So, each unit needs to be checked/calibrated to ensure consistent results.  I have also used the TV-19 5ma/5ma transformer and it appears to be a bit less noisy and has better unit to unit consistency.  But its cost is a little higher.

I suspect the precision rectifier and filter are also key improvement factors.


  KeepIS said  
Just reread your post, the old Nano code that I initially modified is basically the same for the current pwm control code.
.

Good to know the control code didn't change so the improvement is most likely due to the HW changes.