basic stamp & large H-briges

Carl R

Hi I'm hoping that someone could help out a bit. I built a H-bridge using IRFP054N mosfet that i got from a wheelchair controller that didn't work right. The H-bridge works good controlling a 500W brushed motor F/R with 12V, although it's suppose to be 24V that i have not yet tried. The trouble I'm having is figuring out how to run the mosfet, the gate-to-source voltage shows +-20V and if that's the case i would need a transistor to handle 20V source and a 20V drain with a variable gate of 1.4V to 5V so the basic stamp can control it. I can't seem to find information on high power H-bridges for brushed motors, or is there a different way to control these mosfit. I'm still new to all of this. I found the mosfits at Jameco.

IRFP054N mosfet. http://www.jameco.com/Jameco/Products/ProdDS/1562232.pdfowen

erco

That link is bad. I think you meant http://www.jameco.com/Jameco/Products/ProdDS/1562232.pdf

But I love your innocent misspelling of mosfit. Sounds like a misfit mosfet!

RDL2004

A little extra got tacked on to the end

http://www.jameco.com/Jameco/Products/ProdDS/1562232.pdf

LoopyByteloose

There seems to be two schools of thought. One is to use a mosfet driver chip between the uC (your BasicStamp) and the Power Moset. The other is to use a transistor to drive the Power Mosfet.

I think that second is more reasonable for the hobbyist as useful parts are easier to come by. It may be that using 2n2222 and 2n2907 transistors are quite adequate or other simple transistors. I am not 100% as I have found that it is very difficult to find anything on the web for good examples.

I'dt try using Google to search images of MOSfet H-bridge schematics. You might snag something that doesn't come up in a keyword search. Occasionally this works for me.

If I find something, I'll post links here. Here is one.

http://www.electoday.com/bbs/viewthread.php?action=printable&tid=14014