MOSFET H Bridge

As long as you're using N channels where N channels should be, P channels where P channels should be, you've got your sources and drains in the right places, and you're within the current ratings of the FETs, it should work.

Check your wiring.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

Don't try to PWM this one. The shoot-through losses are going to be horrific.

John

10K, around 1000pf and no T-on/T-off handling? Hoo boy, I can already here a loud bang.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

at

Ok, I've done some more testing and found a couple of problems. Most were just wiring, and I've fixed them. But now the whole thing just shorts out. I've found the problem is the lower N channel MOSFETS. They are always conducting. When C or D is high, There is 12V between the drain and +ve rail. But when C or D is low, there is still 12V. I.e. the MOSFET for some reason is not turning off. I'm having the same problem with PCB and breadboard versions. Any ideas as to what could be wrong?

BTW I'm not planning to use it form PWM; just forward and reverse.