Senior Member
Joined: 15/12/2020
Location: United StatesPosts: 178
| Posted: 03:41pm 11 Jan 2022 |
I built a prototype nanoverter and it worked very well in the limits of my testing. But not before I smoked it once or twice. To start troubleshooting this, I suggest you disconnect the control board completely. Use a continuity tester to verify there are no shorted mosfets. Apply power to the board with no control and see if it behaves normally. What I found in one case is that the ir21844 driver chips weren't turning the FETs all the way off and this was apparent even with no control board. Hook up the 'scope and check those outputs. There are many more points to check, but that is a start.
Edited 2022-01-12 02:26 by InPhase