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Old 31st January 2012, 10:23 PM   #1
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Default help with choke power supply

Hi, I like chokes in power supplies but my understanding is very poor. I have been using duncans power supply tool and the equations given in Morgan Jones to come up with the two following possibilities.I use chokes because I think to my ear they give massive dynamics and a cleaner sound. So I thought I would see what happens if in a srpp output stage I use three...Morgan Jones mentions that chokes filter as well as provide power. The first example shows three 20henry chokes...BUT in the second the choke values gradually decrease...If I use this staggered choke arrangement will I have just as much dynamics as three "20's" as well as achieving better power supply filtering?Or am I barking up the wrong tree?Alan
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Old 31st January 2012, 10:25 PM   #2
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having trouble getting the pictures to upload hopefully this has worked
Attached Images
File Type: jpg same chokes.JPG (28.0 KB, 157 views)
File Type: jpg staggered choke.JPG (26.5 KB, 154 views)
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Old 31st January 2012, 11:15 PM   #3
DF96 is offline DF96  England
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You need to check how they behave when the load current changes. LC circuits can resonate. Power supplies with chokes can resonate at subsonic frequencies which may correspond to the musical envelope.
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Old 31st January 2012, 11:37 PM   #4
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hi, most people add extra uf after a choke to kill resonance ... and I found that if I used a choke with low internal resistance and a capacitor of high uf and used morgan jones: indeed the resonance problem was sorted BUT when you used the power simulator it did not like the high uf...So I know where I can buy these chokes off the shelf and their high internal resistance means only a low uf is needed to address resonance...I do not want to add external resistors to the chokes as I want a resistorless supply...so are you saying if thge resonance is okay its better to used the staggered supply?
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Old 3rd February 2012, 11:23 PM   #5
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Why not put the choke first and use it to its maximum to regulate the diode current? It works much better, particularly if you use tuned snubbers to remove the small remaining switching spikes completely, as suggested by Morgan Jones.

One way to ensure there is enough resistance or capacitance for critical damping is to model the circuit in spice with a simple AC swept frequency source. You can model the ESR of the caps and chokes and see whether any damping is not enough.
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