noise and or rfi supression for dimmers for evaluation tests - diyAudio
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Old 5th July 2005, 12:00 PM   #1
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Default noise and or rfi supression for dimmers for evaluation tests



I'm loking for the concepts, principles, specifications, design rules, equations for design a noise and/or RFI supressor coil or torroid for a dimmer that ha s to deliver 2 kW of power, mains 230 Vac and 50 hz the frequency of mains.
Thank you, byplease folks help, me, help to set the foundations of tarspek!
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Old 5th July 2005, 04:39 PM   #2
EC8010 is offline EC8010  United Kingdom
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Hopefully, you'll get a better response here.
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Old 5th July 2005, 09:14 PM   #3
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The simplest filtering approach for dimmers is to place an inductor in series with the load, whose purpose is to limit the turn-on dI/dt slope across the mains wiring, thus dramatically reducing radiated EMI.

That inductor should be sized to handle the peak current drawn by the highest nominal load without saturating. The inductance value should be high enough to limit di/dt to reasonable values, take 5A/us as a refference, but low enough to avoid excessive lag in the current waveform.

For 230V AC mains and 2KW load, a 68uH 13A inductor would be fine.
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Old 8th July 2005, 07:27 PM   #4
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Hi there........I suggest everyone digests www.onsemi.com app AN1048/D.

->When in... on semi web site, type in <suppression> in the upper box and enter.

richj
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