100A High Power Rectifier Diodes with Forward Voltage Drop >200mV wanted - diyAudio
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Old 25th August 2011, 05:24 PM   #1
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Default 100A High Power Rectifier Diodes with Forward Voltage Drop >200mV wanted

Who knows such diodes?
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Old 25th August 2011, 11:17 PM   #2
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What blocking voltage?
For that low <200mV drop at 100A, use MOSFETs.
Although the power dissipation is medium 20W (0.2V@100A), the current is too much for many single semi packages, and PC boards unless you use heavy copper or busbars.

Silicon Schottky Diodes look like Vf=0.7V at 100A
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Old 26th August 2011, 05:09 AM   #3
RJM1 is offline RJM1  United States
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Close but not quite there.
20V 120A Vf typ .27V @ Tj=150C
http://www.sensitron.com/data_sheets/4142.pdf
Got to keep them hot.
Vf typ .42V @ Tj=25C

Last edited by RJM1; 26th August 2011 at 05:13 AM.
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Old 26th August 2011, 05:17 AM   #4
jcx is offline jcx  United States
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probably want to search: synchronous rectification
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Old 26th August 2011, 08:07 AM   #5
Elvee is offline Elvee  Belgium
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GPD (Germanium Power Devices) used to make germanium schottky rectifiers of up to 1200A, but it doen't seem they are still in that business anymore.
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Old 26th August 2011, 10:59 AM   #6
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Quote:
Originally Posted by RJM1 View Post
Close but not quite there.
20V 120A Vf typ .27V @ Tj=150C
http://www.sensitron.com/data_sheets/4142.pdf
Got to keep them hot.
Vf typ .42V @ Tj=25C
http://www.sensitron.com/tempresult_...ber=SD275SE30A
thank you for all advices. Unfortunately no supplier like digikey SD275SE30A offer this diode
I will check as soon as possible a supplier by phone. MOSFET's in general also a good solution but too complicated in the desired application.

I want to use this diode in a diy humbuster (hum-filter, DC filter, DC blocker - circuit idea from me in the PDF attachement) to prevent the electrolytic capacitor against too high voltage in the reverse mode.

The feature of my circuit should be checking out the most effective filtering of unwanted dc components by turning on the mains plug.

If the mains plug not in the right way connected, the arise voltage about the polarized cap shold be as low as possible - therefore the desire of such a diode.

An other solution could be special electrolytic caps with extra high voltage for the reverse mode.
But I don't like topologies (used very often) so called "back-to-back" series connection or anti-parallel connection of electrolytics, because I cannot find anywhere exactly investigations about the behaviour while high current draw (e.g. while the moment of inrush current from a big toroidal transformer).
Such topologies you will find a lot by this URLs here on diyaudio:
Variations of DC Main Filter against buzzing Toroid Transformers - what is the right?
DC blocker diode/cap orientation
dc filter

DC Blocking Filter for Mains
dc blocker test report
?? DIY PS Audio Humbuster
noise from transformer
http://www.analog-forum.de/wbboard/i...threadID=44915
Attached Files
File Type: pdf DC Main DC Filter + inrush current lim-own idea.pdf (10.7 KB, 17 views)

Last edited by tiefbassuebertr; 26th August 2011 at 11:19 AM.
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