Inrush current effect on EMI filter - diyAudio
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Old 23rd September 2003, 01:23 AM   #1
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Default Inrush current effect on EMI filter

I am a rookie at all this DIY stuff. I got my BSEE about 30 years ago and finally am starting to get to use some of what I learned although I must admit the cobwebs are awful thick. To get started I thought I would build someone elses design and settled on the Pass Penultimate Zen. I plan not to make a regulated supply because I have lots of capacitors at my disposal. I will use about 100,000 uf for each channel. When the switch gets turned on those caps look like a dead short across the bridge until they start charging. I notice a CL-60 thermistor in series to limit the in-rush current. My for you more experienced DIYers, my question is this: I would like to add an emi filter to the AC input and I already have one rated for 6 amps. I was wondering what the odds of me cooking the filter and how much does the CL-60 limit the in-rush current to. Thanks to all.
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Old 23rd September 2003, 02:08 AM   #2
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kWski,

Here's a link to the spec sheet on the cl thermistors. It looks as if the max current for the 60 is 5A.
http://www.thermometrics.com/assets/images/cl.pdf
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Old 23rd September 2003, 02:13 AM   #3
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Inrush current with the CL60 can still be close to 24amps from 240V mains or 12amps from 120V mains.
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Old 23rd September 2003, 03:22 AM   #4
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Quote:
Originally posted by AudioFreak
Inrush current with the CL60 can still be close to 24amps from 240V mains or 12amps from 120V mains.
AF,

Yes, I see that now. The 5A max is the steady state current rating of the device.

Here are some previous discussions on this device and other possibilities for limiting inrush.
Parallel Thermistors
Cl-60
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Old 24th September 2003, 01:40 AM   #5
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Gentlemen,

I think I have found a thermistor that will suit my means in limiting the inrush to under 6 Amps. It is made by Ametherm. Here are the specs:

...........................R@25C..........SSI.......Max Joules........R@Hot
MS2230005.............30.0.............5.0........ .....150................0.230

At 120VAC and 30ohms I would have 4 amps maximum inrush. The thermistor would drop .69 volts and dissipate 2.07 watts when the capacitors are fully charged and the amp draws the max. 3 amps of primary current for the Penultimate Zen.

This this sound right, gents? Or am I too rusty?
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