Guru
Joined: 04/10/2019
Location: AustraliaPosts: 678
| Posted: 07:57am 04 Nov 2024 |
Thank you, wiseguy & poida, for your suggestions, much appreciated.
I did try wiseguy's capacitor suggestion today, no joy, if anything it made the regulation worse (down to 195V with the same load).
I shall try measuring the Vfb as poida suggested tomorrow. Meanwhile here are some more details:
The PCB has a ground plane on the component side. The AC voltage is sensed at the toroid winding connection, before any filtering.
A picture of the control board:
And the other side:
And here is how it is located:
Looking down into the inverter, on top of the picture is the heatsink with the power board attached. The driver board is piggy backed onto this with short spacers and the control board on top of that on longer spacers.