help with igbt triggering usin microcontroller or microprocessor

[overLord]

hi.. 'm workin on a vfd ( variable frequency drive) for motors.. i need help wit picking the best suited m.c / m.p for this.. better if its an open source.. the igbt has to triggered between 10 - 1000 times a sec.. plz suggest..

 

[(*steve*)]

What issues are you having?

I wouldn't think the uC/uP makes any real difference.

I'd be considering optocoupling the output to the driver for the IGBT, and then using an appropriate driver to get the required gate current.

 

[overLord]

i need a uc/up because i need to provide a heads up display of frequency n speed etc. n i also have to interface a key pad to vary the freq.
i understand that optocoupler can be used to drive an igbt. n tat it also prevents rapid voltage changes.. but how can i use it for this app, this is my first time in this area so plz don mind if i end up talkin rubbish..

 

[(*steve*)]

OK, the first thing is that you should probably use a proper gate driver for the IGBT. It may be overkill in your application but it helps prevent switching losses. Switching losses can be a large contributor to the total dissipation of the device and may be unexpected.

Get the datasheet for a gate driver (I believe that mosfet and IGBT drivers are practically identical) and see if it tells you how to interface an opto-coupler to it.

Driving the optocoupler is essentially as simple as driving a LED. Choose a series resistor as you would for a LED connected to one of the outputs of the uC.

When I said the uC/Up doesn't mak any real difference, what I was saying is that there is no need for a special uP or uC. Pretty much anything will be able to be used.