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In Reply to: RE: How to connect LL2733 for choke input posted by KevinC on November 06, 2016 at 15:42:09
Great! Thank you.
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You might still consider using a small value film cap after the rectifiers. There will be a short window in every AC cycle where the rectifiers are not conducting. As the magnetic field in the choke collapses it will generate a high voltage spike. A small cap before the choke will help mitigate that issue.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
Ok, Thank you. Good to know. Tried to model it with PSU Designer II, but it didn't work out. How small should it be?
Edits: 11/07/16
My guess is you'd be looking at 0.2-1.0uF. It will increase the output voltage somewhat and also increase the output impedance of the PS by a small amount. Be sure to use a cap that is rated for high ripple current. Some of my projects that are designs of Kevin's use a Gentech 1.0uF cap that he favors and the big mono-blocks with a 600V B+ use 850V rated GE 0.68uF caps. Morgan Jones 4th ed. has a graph that illustrates the change in voltage and output impedance with different cap values.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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