H-Bridge: Difference between revisions
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I think DRV8701 allows you to mount your own mosfets, which may allow me to increase the power capacity. look for "Full-Bridge Gate Driver" or "full-bridge pre-driver" | I think DRV8701 allows you to mount your own mosfets, which may allow me to increase the power capacity. look for "Full-Bridge Gate Driver" or "full-bridge pre-driver" | ||
http://www.modularcircuits.com/blog/articles/h-bridge-secrets/ | * http://www.modularcircuits.com/blog/articles/h-bridge-secrets/ | ||
* https://www.youtube.com/watch?v=xbJ0dT-VZIQ | |||
== Discrete Driver == | == Discrete Driver == | ||
Revision as of 00:48, 6 April 2019
These end up getting tricky to build discretely, but high power versions get costly.
I think DRV8701 allows you to mount your own mosfets, which may allow me to increase the power capacity. look for "Full-Bridge Gate Driver" or "full-bridge pre-driver"
- http://www.modularcircuits.com/blog/articles/h-bridge-secrets/
- https://www.youtube.com/watch?v=xbJ0dT-VZIQ
Discrete Driver
The bridge itself is pretty simple, but driving it is awful.
Low side is fairly easy. At low voltages, a BJT can be used. At higher voltages, we need to raise the gate voltage because it should only be 10-20v lower than the high side.
The high side driver is a pain because high side N-Chan driving is always a pain. As long as it will never go high for long periods, a bootstrap cap can be used.
VFD
3 half bridges can be used to create a VFD for a 3 phase induction motor.