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Old 30th April 2010, 06:42 PM   #21
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I'm not sure I understand the two supplies, or the voltage doubler. A single Hammond 270HX with a CLC supply and a choke (Hammond 159S) will be easier, and better, and probably cheaper too -- you can buy the pair for under $100.
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Old 30th April 2010, 06:50 PM   #22
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looks good to me, you could probably drop the 150r to <50

the first cap doesnt need to be so big either, but it does no harm being so
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Old 30th April 2010, 06:56 PM   #23
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looks good to me, you could probably drop the 150r to <50

the first cap doesnt need to be so big either, but it does no harm being so
I don't think I can drop the resistor further and get under 330VDC for the B+, unless you're saying that the current will run lower than 200mA for the entire circuit?

Kofi
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Old 30th April 2010, 07:01 PM   #24
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drop the first cap, it will lower the B+
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Old 30th April 2010, 07:05 PM   #25
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Yes. Set the reporting delay for ~10 seconds. Then, set the simulation time for ~30ms. This will give you a good look at both the amount of ripple, and the shape of the ripple.
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Old 30th April 2010, 07:06 PM   #26
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If you drop the first cap low enough, the ripple on it allows the inductor to store energy and deliver it at a lower voltage to the second cap. It starts looking like a buck converter instead of just an LC filter.
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Old 30th April 2010, 07:15 PM   #27
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Quote:
Originally Posted by adamus View Post
drop the first cap, it will lower the B+
Quote:
Originally Posted by dsavitsk View Post
Yes. Set the reporting delay for ~10 seconds. Then, set the simulation time for ~30ms. This will give you a good look at both the amount of ripple, and the shape of the ripple.
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If you drop the first cap low enough, the ripple on it allows the inductor to store energy and deliver it at a lower voltage to the second cap. It starts looking like a buck converter instead of just an LC filter.
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Old 30th April 2010, 07:16 PM   #28
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that is almost no ripple. for a push pull that is completely insignificant

a nice film for the first and a nice heacy duty cap for the second and you will be ok.
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Old 30th April 2010, 07:29 PM   #29
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Kofi: A Hammond 270HX based supply would be full wave center tapped; you can change the bridge rectification in PSUD to full wave CT to reflect this. One difference between the two is that you need 2X voltage rated diodes in the FWCT config compared to bridge rectification.

Add V/1386L to your nominal current rating for the choke current rating to allow for ripple current if you are going to use a choke. (V is transformer secondary voltage & L is choke L).

I also used 1200V 8A Fairchild stealth diodes bypassed by 10nf 2Kv caps and a pair of Hammond 270EX transformers in my BH monos (orig schema).
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Old 30th April 2010, 07:45 PM   #30
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that is almost no ripple. for a push pull that is completely insignificant

a nice film for the first and a nice heacy duty cap for the second and you will be ok.
If we need to go film for the first cap, I can only consider Solen 630V PPEs. For the second, I was going to grab a regular old electrolytic and go with that.

Why does a film cap make a difference as the first cap? I always thought the last cap was the one you "heard".

Kofi
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