Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1459
| Posted: 04:20am 26 May 2021 |
Nicks:
the nanoverter feedback voltage is about 2.75V.
This is referenced to the nano's ADC voltage reference
and so for the picoverter I just built, it's 5.05V
When the inverter is running, the closed loop control will ensure
the feedback voltage is 2.75V or increase the output AC voltage
to try and get it there.
It's up to us to give it the 2.75V at our desired output AC voltage
by whatever means are needed.
The nanoverter & picoverter Vfb input circuit draws about 1.5mA
so some of the smallest PCB type transformers might not be able
to provide this current.
(you can see where I got the 2.75V from if you look in the nano1 or picoverter
code. somewhere I do a comparison of the feedback voltage sensed
on ADC pin A0 with 0.55 0.55 x 5V = 2.75V)