On Sun, 15 Jul 2007 14:10:40 +0100, "Eycott, George, VF UK - Technology \(TS\)" <[EMAIL PROTECTED]> wrote:
>> But if the output of the invertor was fed through a 1:1 transformer, >> this would remove some of the harmonics - but would it be enough I >> wonder ?. >> >> Why - because a transformer is an inductor and the impedance goes up >> with frequency. > >Ah, but if memory serves the output waveform is related to the rate of >change of the input waveform, so if you feed a series of steps in >(modified sine wave made from lots of square waves added together) you >will get a series of spikes out, which is even worse! > Where's a recently qualified electrical engineer when you need one :-) But a fast rate of change IS higher frequency, and transformers designed for 50Hz will act as a choke and filter out the edges of the waveform - no / yes ? Malcolm -- Malcolm
