I wonder if I am mistaken here. The transformer primary is an inductive element. True, there is distributed coil capacity, and a frequency component that makes the system complex. So there will be some "natural" resonance that may not be at 100 KHz and may have a very low Q, regardless of the fact that the transformer was designed to operate at 100 KHz. But by adding the properly selected components, could one not design starting from the LCR characteristic of the primary winding to create a tuned circuit at 100 KHz and 50 ohms Z? Also, would it be true that if the Q is high the stability of the oscillator must be high in order to stay within the resonant bandwidth? So, a high Q may not be desireable and the R component would be a factor? All comments, criticisms, "Oh what stupidity" comments are welcome. ----- Original Message ----- From: "Vasile Surducan" To: "Microcontroller discussion list - Public." Sent: Saturday, August 09, 2008 9:07 AM Subject: Re: EE > Nice way of computing... A square signal bumped with a positive glich > at the end of the rising edge will increase the current with 10-20% at > the same secondary load. > Does the primary impedance seen by the driver will be different ? > > Vasile > > On 8/9/08, Apptech wrote: >> > Where did you get 16 ohms from? >> >> R = V/I. >> The driver sees the load reflected via the transformer. If >> 230 VAC causes 14 amps to flow then the AC is seeing 230/14 >> ~= 16. >> >> In the absence of load the actual transformer impedance will >> be seen but it will very usually b swamped when loaded. >> >> >> Russell >> >> >>>> I have to drive a transformer primary at 230 VAC @ 14 >> >>>> Amps @ 100KHz. I have not yet measured the primary >> >>>> impedance, but I will. >> >> >> >> The impedance you see will be about 16 ohms - ie the >> >> load, >> >> more or less regardless of the transformer's unloaded >> >> impedance. >> >> >> >> >> >> Russell >> >> -- >> 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