At 02:09 AM 1/31/2005, Bob S. wrote: >And PWM's AC Phase control has little to do with a SMPS, other than it >would use MOSFETS or IGBT's instead of a triac/scr's. No Large >eletrolytic Caps involved, No rectifying the AC into DC (hence, no large >caps), no bootstrapping, no hiccup mode, etc, etc.... The Topology is >even totally different. > > > > Inductor Inductor >Hot---------(((((--<-Mosfet---Mosfet->--)))))---LOAD > | >60hz AC Line | > | >Neutral-------------------------------------------| > >Keep in mind that this a crude block diagram, not a detailed scematic, so >please don't go off on a tangent telling me how wrong it is. I've been toying with that concept off and on for quite a while now - no real work done on it, just back of napkin stuff and such. I really do have to get off my duff and get serious about it, though. Just out of curiosity, what was your original application? It almost sounds like one of those wood-burning pens you see in craft shops or at Lee Valley Tools. I've built a couple of those over the years - the pen and nichrome elements came from Lee Valley (Razortip comes to mind) and it was child's play to build my own phase-controlled transformer supplies. I keep one handy near my shop bench for cutting and shaping plastic. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 20 years of Engineering Innovation (1984 - 2004) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist