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ahmad_imran
Joined: 09 Jul 2004
Posts: 10
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 20 Jul 2004 8:52 Low Pass Filter |
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Hi everyone,
Is anyone know how to design very accurate low pass filter that can support 16 Amp current.
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brmadhukar
Joined: 21 Jun 2002
Posts: 844
Helped: 29
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| 21 Jul 2004 4:18 Re: Low Pass Filter |
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You have to have very large inductances and low ESRs. What is the frequency U need to filter?
B R M
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mrcube_ns
Joined: 10 Apr 2002
Posts: 416
Helped: 10
Location: Dark side of the Moon
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| 21 Jul 2004 7:19 Re: Low Pass Filter |
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Did you maybe selected wrong forum (microcontrolers)?
OK, first you have to say which one low pass filter you want (butterworth, Bessel or so...).
Second, you have to know how good filrating you need (10dB/dec, 20dB/dec ...)
Third, on what frequency you want to start filtering.
16 Amps => I suppose you dont need digital filer (see first line).
Mr.Cube
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pisoiu
Joined: 31 Dec 2002
Posts: 889
Helped: 24
Location: Romania
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| 21 Jul 2004 7:23 Re: Low Pass Filter |
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Moved here from microcontroller area.
/pisoiu
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DoctorX
Joined: 02 Sep 2004
Posts: 73
Location: USA
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| 15 Sep 2004 1:33 Re: Low Pass Filter |
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| ahmad_imran wrote: |
Hi everyone,
Is anyone know how to design very accurate low pass filter that can support 16 Amp current. |
You should use high-current-rating passive inductors plus some heavy duty capacitors, as the current is large. For accuracy, you may have to tune it, unless you can get very accurate components.
You might be able to design an active filter using some high-power opamps, but the chance is pretty dim.
In both cases, make sure you do large signal simulation. When nonlinear characteristics kick in at such a high current, the filter performance may degrade/change a lot from small signal.
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IanP
Joined: 05 Oct 2004
Posts: 6346
Helped: 1505
Location: West Coast
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| 06 Jan 2005 4:25 Re: Low Pass Filter |
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Item very similar to filters used for motors and variable speed drives (mains side).
Attached is its diagram.
Wire gauge: Φ2mm...14 turns for each L.
Filter mounted in a steel box (good shield).
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