Thank you for the reply Sean. I do not mean PWM. I mean fixed frequency, sinusoid, at 100 KHz. I had the transformer wound special for this application. I have in mind an H-bridge and I have been looking over IGBTs. I want to spec the margin of error to be +25% for power. The transformer is for a power supply for an special instrument that I have designed. This transformer cannot be found off-the-shelf : - ) I have never designed with IGBTs before but I do not see that as a problem. I am a little puzzled on the selection since I have never specified one either. I will appreciate any input, comments, criticisms or remarks that anyone has to offer. ----- Original Message ----- From: "Sean Breheny" To: "Microcontroller discussion list - Public." Sent: Saturday, August 09, 2008 1:18 AM Subject: Re: EE > Hi Rich, > > What is the application? When you say "at 100KHz" do you mean that as > the PWM frequency or do you mean that the overall frequency > (fundamental frequency) of the drive voltage is 100KHz. If you mean > the latter, then this has got to be a very special transformer. > > I would suspect that the best way to do this would be with an H bridge > made from four IGBTs or regular BJTs, although 100KHz is really > pushing it there. You can find FETs that work at those voltages but > they are not that common, especially with a reasonably low Rds_on. > > Sean > > On Fri, Aug 8, 2008 at 10:51 PM, Rich wrote: >> I have to drive a transformer primary at 230 VAC @ 14 Amps @ 100KHz. I >> have not yet measured the primary impedance, but I will. I am wondering >> if anyone has already worked with Power FET complements at that high >> current and voltage, and which FETs may have been used. >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist