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Offline kazem2114Topic starter
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« on: May 30, 2012, 09:20:11 am »
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Hi guys
I simulated the output of my "Luminous 15000 metal detector"
but I am a little bit confused of output waveforms.
my detector is a "PI detector" and it doesn't work and I wana fix it
"IRF840" is on just for 200usec
Does it mean that my LOOP just search for only 200usec
What I expected to see was that "IRF840" be on for (1-td)
but now it's on for td=200usec
and approximately how much current according to ICs is going to coil(=LOOP)?

Please explain how this part works...
Thanks


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Offline Homefire
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« Reply #1 on: May 30, 2012, 09:45:41 am »
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Have a read here.    This will give you a good Idea on how they work.

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http://users.cecs.anu.edu.au/~Salman.Durrani/_teaching/TA5.pdf


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Offline kazem2114Topic starter
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« Reply #2 on: May 30, 2012, 11:04:43 am »
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I read this article and a lot of others before
but what I see now is dramatically different...
The frequency is about 130 Hz and Duty Cycle is 99%
but I have Current in my coil in 1%
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 Shocked

Posted on: May 30, 2012, 10:59:06 AM
and also my current in this 1% is about 52 mA
How my metal detector can detect metals by 52mA Huh?Huh?Huh?Huh??


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Offline xavier
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« Reply #3 on: May 30, 2012, 03:01:19 pm »
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OK so here are a few questions for you

1) What is the on time?
2) What is the delay time?
3) What is the sample time?

Regards Xavier PS if you do not use the simulator correctly you will not have the correct info out of it (I use a scope)

Posted on: May 30, 2012, 09:58:18 PM
Ho yes nearly forgot there is no such thing as frequency in a PI detector. Only pulse per second

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So many questions so little time

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