Originally posted by Ufopolitics
View Post
still waiting for diagram!
Basically your intention seems to be viable (as I understood your words). The implication is usually that controllers perform all kind of checks and supervision at important circuit parts. This might cause them to enter a safety or emergency mode and that is not what we expect.
@ALL: As Ufo experienced a FET driver needs to be double supervised in order to prevent total loss. The problem is that FETs increase their resistance if they get hot. One FET failing causes others to increase their resistance as well ..... -> that is a so called domino effect!
This is the reason industry likes IGBTs for severe power applications. They behave inversely and hence somewaht more safe. For our applications it is not necessary using IGBTs.
Measures for safe FET operation:
1. Use a fuse being adapted to your current application.
2. Provide an emergency switch at your setup in order to imediately stop current in case of damage.
3. Use of a temperature sensor at FETs (definitely an issue for next driver desing)
JS


) so I only recommend them at your own risk...
Things get better



Leave a comment: