Flyback X'mer Clamp RCD Configuration question

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Magnethicc

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Hello Everyone,
In the RCD Clamp of a flyback x'mer I often see two variations:



I can see they both operate the same but I was wondering if there is any differences between the two configurations of the diodes?
Thank you.
 

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Hi,

They are exactly the same.

In a series connection the order of connection does not matter.

Klaus
 

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Same, but use the Right hand one, as you have a nice rail to hook scope (or diff probe) "ground" on to when you look at the rcd clamp capacitor voltage...always try and have your scope probe "ground" hooked to a quiet node, rather than a switching node, if possible.
Also, theyre both missing a bit of series resistance, in series with the diode...and of course, neither is the nice RCDZ clamp....which is good for light load power reduction
 

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