Yes! You are absolutely correct. The term is interelectrode capacitance. Thank you for catching my sloppy phrase. ----- Original Message ----- From: "jim" To: "Microcontroller discussion list - Public." Sent: Sunday, August 10, 2008 10:42 AM Subject: Re: EE > All, > > Nitpicking here, but the correct term is "Capacitance", not "Capacity". > > > Regards, > > Jim > ----- Original Message ----- > From: "Rich" > To: "Microcontroller discussion list - Public." > Sent: Sunday, August 10, 2008 12:23 AM > Subject: Re: EE > > >>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 >> > > -- > 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