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Re: [TCML] how to work out average current ?



Hi Tim,

Hi Chris - I'm not sure which of the waveforms was your current waveform. I
think that it was the turquoise one.  I see up and down spikes, but from

yes you guessed right, it was the triangle shaped one. spikes to about 1.1Amps and slowly drops over about 500uS or so.



what I could tell - the time between the up spike and the down spike is 10
miliseconds. If the current waveform is truly just as much above 0 amps as it is below 0 amps - the average current would be 0 amps. If you wanted to
find the root mean square current, that can also be done semi-easily.

Well true the pulse is pos and neg, I am just thinking towards a single cycle..



I'm just not particularly familliar with the type of coil you are making -
or I would be able to probably just give you the answer ...


Its just a DC res-charge design. the current is AC amps form the NST secondary. As I can't draw 1.1Amps form the secodnary, it will be limited to about 100mA so it would take maybe 10times longer to charge...



Since you have a simulator, you may also be able to save the current
waveform to a text file of some sort.  You could send the file to me and I
will integrate it for you - or I could help you write a formula for a
spreadsheet program to do it. I do this sort of stuff all the time and I'd
be happy to do it for you ...


The current waveform is the turquoise one... really out of a 50hz wave you are only looking at really 1 fully AC cycle in total. I could overlay the AC waveform.. the tank volts is the red line running at 400hz..



For the average current, you integrate it and divide by the length of the
waveform (in time).

For the root mean square current, you square each 'y' value, integrate the
waveform, divide by the length in time, then you take the square root of
that value.

If your waveform has bipolar pulses (just as many positive current as
negative current) you'll need to do the RMS method.

The RMS way the simulate calculates it as 150mA.. I know 80mA limited via a resistor will *just* charge up in between each mains cycle. So 100mA should be about the right figure.. each 50mA though is an addition of another NST. so just trying to work out what would fit.. The figure has to be between 80mA and 150mA so maybe 100mA is the way to go...

Chris







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