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Old 11th January 2005, 08:07 PM   #1
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Default PSU Ringing

I have a high-current power supply for my Zen amplifiers - 2 channels operating at 2A each, for a total of 4A. At first, I was using a choke-loaded diode bridge (otherwise known as choke regulation). I use the choke to improve power factor and lower peak currents - sure, output voltage is lower, but peak currents are dramatically reduced (it is also dangerous - if the load is removed, the voltage shoots up!). I'm only using 3 to 6mH, so it's not into continuous conduction.

I bought a 66 volt Avil-Lindberg transformer from PartsExpress. It's a great deal! After the choke, I get about 50V. I have both channels on the same PSU, so that if one channel fails, the second channel continues to load the choke (choke-loaded power supplies require a load to regulate voltage).

I had a horrible ringing in the PSU. When the diode turned off, a very sharp high frequency spike would appear. I removed the bridge and made a half-wave using ultrafast diodes from IXYS. The ringing is still there.

It must be the choke loading - as the choke drags current out of the diode, the PN junction slams shut. But since it's not continuous conduction, it's at zero current! What's happening, and how do I fix it? I tried a snubber, but it just resonated with the choke - big mistake!
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Old 11th January 2005, 08:31 PM   #2
Steven is offline Steven  Netherlands
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The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973
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