HexFRED and SMPS?

Kuro · 26th March 2010, 03:24 AM

I see people routinely replace rectifying diodes in linear power supply with HexFREDs for lower switching noise.

Do I get similar benefit if I replace the rectifying diodes in SMPS with HexFREDs?

Enzo · 26th March 2010, 04:32 AM

Your rectifier diodes in any commercial SMPS should already be fast recovery types.

Kuro · 26th March 2010, 08:58 AM

Quote:

Originally Posted by Enzo

Your rectifier diodes in any commercial SMPS should already be fast recovery types.

It is not fast recovery we want. It is the soft recovery characteristic we want (ie: prevent ringing)

Sch3mat1c · 26th March 2010, 06:12 PM

Ringing is prevented by proper design.

Tim

tvrgeek · 22nd December 2011, 07:04 PM

OK time to see if I actually get fewer harmonics with Hexfred than standard diodes with snubbers in a traditional linear supply. I notice several packaged as dual in common cathode packages, but none in common anode, and only a very few full wave bridges in higher amperage for very high price. I also notice HUGE differences in response time and C between vendors. Anyone found some jewels out there?

tvrgeek · 23rd December 2011, 08:56 PM

I ordered one of these expensive bridges to try in my DH120. We shall see.

26th March 2010, 03:24 AM	#1
Kuro diyAudio Member Join Date: Jun 2008	HexFRED and SMPS? I see people routinely replace rectifying diodes in linear power supply with HexFREDs for lower switching noise. Do I get similar benefit if I replace the rectifying diodes in SMPS with HexFREDs?

26th March 2010, 06:12 PM	#4
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Ringing is prevented by proper design. Tim __________________ Seven Transistor Labs Projects and Resources

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
IRF's Hexfred or Schottky?	eeka chu	Solid State	14	3rd December 2007 02:19 PM
Hexfred diode bridge.	tubee	Solid State	1	4th June 2007 07:31 AM
Snubber for HEXFRED?	pooge	Solid State	3	29th July 2005 02:41 AM
HexFRED - why?	richie00boy	Parts	2	21st November 2003 06:27 PM
How To Build a HEXFred Bridge	li_gangyi	Solid State	13	8th October 2003 02:00 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

26th March 2010, 04:32 AM	#2
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Your rectifier diodes in any commercial SMPS should already be fast recovery types.

22nd December 2011, 07:04 PM	#5
tvrgeek diyAudio Member Join Date: Dec 2009 Location: Md	OK time to see if I actually get fewer harmonics with Hexfred than standard diodes with snubbers in a traditional linear supply. I notice several packaged as dual in common cathode packages, but none in common anode, and only a very few full wave bridges in higher amperage for very high price. I also notice HUGE differences in response time and C between vendors. Anyone found some jewels out there?

23rd December 2011, 08:56 PM	#6
tvrgeek diyAudio Member Join Date: Dec 2009 Location: Md	I ordered one of these expensive bridges to try in my DH120. We shall see.