Hello Andy. http://imagebin.org/246204
Here's a picture of what I scoped the other day, this is the signal coming out from the IC's that we use to fire the igbt's, as you can see those spikes are a little dangerous I think. I've talking a lot with Tim and he's a great help, he's always helping me with his advices and knowledge. About using an arduino or fpga, I've been thinking about that too, I need to catch on with VHDL since I've only made some simple counters and multiplexers but I really like the idea of make a whole system from an fpga. Anyway, the main problem here is after the firing IC's since the oscilator is generating a perfect square wave form. 2013/2/10 andy pugh <bodge...@gmail.com> > On 10 February 2013 22:15, Leonardo Marsaglia > <leonardomarsagli...@gmail.com> wrote: > > based on DIY circuits found on the internet. > > I guess you have seen: > http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html > (Lots of clever stuff, much better done in software now) > > > Anyway, the real deal here is always how to have a clean square signal to > > fire the igbt's. > > Sounds like a job for Arduino or FPGA. I can't help feeling that there > ought to be a suitable Mesa module, but Arduino's have PWMs that share > a clock, so for suitable thresholds are guaranteed not to overlap. I > don't know how smoothly you can change frequency > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > ------------------------------------------------------------------------------ > Free Next-Gen Firewall Hardware Offer > Buy your Sophos next-gen firewall before the end March 2013 > and get the hardware for free! Learn more. > http://p.sf.net/sfu/sophos-d2d-feb > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
