noise and or rfi supression for dimmers for evaluation tests

dannymansbach · 5th July 2005, 12:00 PM

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!

EC8010 · 5th July 2005, 04:39 PM

Hopefully, you'll get a better response here.

Eva · 5th July 2005, 09:14 PM

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.

richwalters · 8th July 2005, 07:27 PM

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

5th July 2005, 12:00 PM	#1
dannymansbach diyAudio Member Join Date: Jul 2005 Location: nethanya, israel	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! __________________

5th July 2005, 04:39 PM	#2
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	Hopefully, you'll get a better response here. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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5th July 2005, 09:14 PM	#3
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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.

8th July 2005, 07:27 PM	#4
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	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