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Old 03-07-2010, 06:32 PM   #3106 (permalink)
Weisheimer
Mark Weisheimer
 
Join Date: Aug 2009
Location: Columbus Ohio
Posts: 62
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Quote:
Originally Posted by peja1971 View Post
... I use 40 of IRFP260N mosfets and 40 of 200v680uf capacitors and I looking for best solution to drive this huge amount of mosfets. I haven't supplier who can bring me one ixys IXDD414PI 14A mosfet driver or some similar in short time, and I consider to drive it with BDX53 AND BDX54 transistors.
Take a look at how Curtis drove a similar number of mosfets using a totem pole transister drive. Your BDX53/54 are darlington transistors which will require a fairly strong drive circuit. You could use the circuit shown in the top right corner of this PDF file. Q6, Q7, and Q8 is the totem pole drive I am referring to. These are small signal TO-92 style transistors.

http://www.evdl.org/docs/curtis_1221b_schematic.pdf

Also, what is the source of your PWM signal?
What are you using for your freewheel diodes?

You have plenty of reserve using the mosfets and caps that you have
chosen as long as you have good heat sinking for the mosfets.
The caps should be very low ESR as well.

The Vehicle looks like it will be fun!

Cheers
Mark
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