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Another option for an inductor input filter?
Another option for an inductor input filter?
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Old 1st June 2017, 07:53 PM   #1
Kay Pirinha is online now Kay Pirinha  Germany
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Default Another option for an inductor input filter?

Hi,

sometime it is adviceable to prefer a LC power supply filter over a CLC one, i.e. an inductor as the first filter element. Given a two way rectifier with a vacuum or a gas filled double diode with direct heating. Usually the first filter element is connected to the center tapped heater winding. Is it a good idea to connect a center tapped choke in parallel with the heater winding and connecting the first filter cap to it's tapping, so that this choke works as the L input? By this way, I think, a gapped core is no more necessary, so the needed inductivity could be achieved by less turns.

Or is it better to use a bifilarly wound choke with a gapped core for this duty?

Best regards!
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Old 1st June 2017, 08:10 PM   #2
DF96 is online now DF96  England
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You would need the AC and DC to go in opposite directions to make use of a common-mode choke. In a PSU smoothing application they go the same way. No free lunches!
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Old 5th June 2017, 08:34 AM   #3
Happy 2017 is offline Happy 2017
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So, which inductor will be use for this design?considering the AC-DC opposite directions?
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Old 5th June 2017, 02:24 PM   #4
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by Happy 2017 View Post
So, which inductor will be use for this design?considering the AC-DC opposite directions?
AC goes in two directions, how do you see "opposite" ?
Mona
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Old 5th June 2017, 03:37 PM   #5
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Choque input filter is my prefered, but in your case you will need a large choque capable of carrying heater current (Several amperes) with negligible DC loss, but with sufficiently high inductance to provide choque input action. So it will be very large, bulky and expensive, although it can run.
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