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

["Tim Meehan" <btmeehan@xxxxxxxxx>]

If I understand you correctly, your waveform looks something like this:
(again, awful ascii art - only works with fixed width font)
 _
| |
| |________________
The initial spike lasts 10 microseconds, and the spike repeats every 500
microseconds.  In this case, I am assuming that the spike is a rectangle
(which is prehaps reasonable).  Your average current would be
10usec/500usec*1A = 20mA.

Hope I answered your question :)

Tim

On Nov 16, 2007 8:18 AM, Chris Swinson <list@xxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

> Hi all,
>
> If a curent spike peaks to 1A over 500uS then what is the average curent
> over that cycle ?  further complicates things as actual spike only lasts
> about 10uS then falls in current to zero over the rest of the 500uS
> period..
>
> I am working on a DC res-charge circuit so it draws sharp current pulses.
> My
> NST will be current limited to maybe 100mA (depending on what NST I use)
> so
> just wondering if the 100mA limit will be enough to charge the smoothing
> caps up.
>
> I think it works out at 150mA, at least that seems to be the RMS figure.
> 150mA may take longer to charge the capacitor though I do not see this as
> a
> problem.
>
> I was trying to think how to add a current limiter into my simulation
> without using a resistor but can't think of a way of doing it. 5,000uS
> seems
> to be the charge time on 80mA limit via a resistor though it takes a full
> second of time to charge the smoothing caps up..
>
> Does these figures sound about right ?
>
> cheers,
> Chris
>
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