fast bridge rectifier

MurrayP · 23rd February 2006, 04:43 AM

HI,

can anyone here point me toward a fast recovery bridge rectifier in the same package as the standard 25A/35A metal packages please?

thanks

Murray

Dr. Apathy · 23rd February 2006, 11:27 AM

What is the purpose of a rectifier recovering quickly, and what does it recover from?

MurrayP · 23rd February 2006, 05:00 PM

it's to do with how fast it stops reverse conduction when reverse biased. Fast rectifiers create less noise in audio power supply rectifier circuits.

Nigel Goodwin · 23rd February 2006, 05:13 PM

Quote:

Originally posted by MurrayP
it's to do with how fast it stops reverse conduction when reverse biased. Fast rectifiers create less noise in audio power supply rectifier circuits.

Do they? - I would have imagined just the opposite?.

They are usually used in switchmode PSU's and line output fed supplies - anything that runs at a higher frequency. Generally you don't see them used as normal mains rectifiers.

MurrayP · 23rd February 2006, 05:41 PM

oops - please excuse my looseness with words - most fast rectifiers these days are also soft recovery. I equated fast with soft recovery. With fast soft recovery you don't tend to get the snap off effect that you do with conventional rectifiers. That can be beneficial even at 50Hz in reducing what is often heard as buzz in power supplies from the rectifier noise. That is the same noise that the small cap often placed across the bridge diodes similarly suppresses. I hope I'm not going to regret prolonging this - I wasn't after an argument - just a direction to any such diode pack.

Nigel Goodwin · 23rd February 2006, 08:26 PM

No argument, I was just asking - I'd never heard that before. I also thought the small capacitors across the rectifiers were to help prevent them being damaged by mains borne spikes?.

lgreen · 23rd February 2006, 08:48 PM

Quote:

Originally posted by Nigel Goodwin
No argument, I was just asking - I'd never heard that before. I also thought the small capacitors across the rectifiers were to help prevent them being damaged by mains borne spikes?.

Nope, I think the mains borne spikes are suppressed by line rated capacitors across the AC mains. The caps across the rectifiers are to supress the noise generated by the switching of the rectifier diodes and need not be mains rated.

Can't help you with the same package-- but for something that is relatively close check out the IXYS VBE models (figures 24, 74) here.

audiorasp · 23rd February 2006, 09:41 PM

MurrayP, this part may be what you are looking for:

http://www.diotec-usa.com/35dbps.PDF

Problem is, though, I don't think you can buy these through regular distributors, and their minimum order is probably more than one person would be willing to buy.

Lee1234 · 23rd February 2006, 09:54 PM

The background of the music is much quieter with the fast rectifiers-it seems to make a sharper contrast(dynamic range) in the music.More difference between loud and soft passages. An old Audio Am article explained it. Less Rf floating in the curcuits.

Lee1234 · 23rd February 2006, 09:54 PM

Makes a big difference in preamps. Never tried it in power Amps so I don't know there.

23rd February 2006, 04:43 AM	#1
MurrayP diyAudio Member Join Date: Oct 2001 Location: Napier, New Zealand	fast bridge rectifier HI, can anyone here point me toward a fast recovery bridge rectifier in the same package as the standard 25A/35A metal packages please? thanks Murray

23rd February 2006, 08:26 PM	#6
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	No argument, I was just asking - I'd never heard that before. I also thought the small capacitors across the rectifiers were to help prevent them being damaged by mains borne spikes?. __________________ Nigel Goodwin

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23rd February 2006, 11:27 AM	#2
Dr. Apathy diyAudio Member Join Date: Feb 2006 Location: BrisVegas, Australia	What is the purpose of a rectifier recovering quickly, and what does it recover from?

23rd February 2006, 05:00 PM	#3
MurrayP diyAudio Member Join Date: Oct 2001 Location: Napier, New Zealand	it's to do with how fast it stops reverse conduction when reverse biased. Fast rectifiers create less noise in audio power supply rectifier circuits.

23rd February 2006, 05:41 PM	#5
MurrayP diyAudio Member Join Date: Oct 2001 Location: Napier, New Zealand	oops - please excuse my looseness with words - most fast rectifiers these days are also soft recovery. I equated fast with soft recovery. With fast soft recovery you don't tend to get the snap off effect that you do with conventional rectifiers. That can be beneficial even at 50Hz in reducing what is often heard as buzz in power supplies from the rectifier noise. That is the same noise that the small cap often placed across the bridge diodes similarly suppresses. I hope I'm not going to regret prolonging this - I wasn't after an argument - just a direction to any such diode pack.

23rd February 2006, 09:41 PM	#8
audiorasp diyAudio Member Join Date: Feb 2001 Location: Sacramento, CA	MurrayP, this part may be what you are looking for: http://www.diotec-usa.com/35dbps.PDF Problem is, though, I don't think you can buy these through regular distributors, and their minimum order is probably more than one person would be willing to buy.

23rd February 2006, 09:54 PM	#9
Lee1234 diyAudio Member Join Date: Sep 2005 Location: California	The background of the music is much quieter with the fast rectifiers-it seems to make a sharper contrast(dynamic range) in the music.More difference between loud and soft passages. An old Audio Am article explained it. Less Rf floating in the curcuits.

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