H-Bridge: Difference between revisions
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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. | 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. | |||
[[Category:Electronics]] | [[Category:Electronics]] | ||
Revision as of 22:09, 5 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/
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.