As usual I realized after I hit send that you probably just divided :)
I should further engage brain before engaging mouth (or typing
fingers).

Hmmm...somehow, though, it sounds to me like he wants to put a 100KHz
sine wave through a transformer designed for 50 or 60Hz. If so, I
don't think that will work very well in terms of core losses, skin
effect losses, winding capacitance, reduced coupling from pri to sec,
etc.

If, on the other hand, he is using 100KHz PWM to synthesize a 50Hz
sine wave, for example, then that should work well (although the PWM
frequency is a bit high).

Sean


On Sat, Aug 9, 2008 at 8:42 AM, Apptech <apptech@paradise.net.nz> 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