Is MUR3060 good for bridge rectifier?

ozonek · 15th June 2007, 02:24 AM

I have 8 MUR3060 and plan to build a 100Wx2 amplifier. Is this device a better choice over the KBPC3510 bridge rectifier?

MUR3060 is the high current version of MUR860. (30A, 600V) and this device has 3 legs which are two diodes in parrallel.

sandyK · 15th June 2007, 05:00 AM

Generally these fast devices have a much lower surge rating than the KBPC3510. Look at this parameter in their data sheets. If you have a lot of capacitance in the PSU, it may be worthwhile using some kind of surge limiter to reduce current for a short period on switchon. Otherwise the fast devices may fail, This has been reported in several forum postings.
SandyK

ozonek · 15th June 2007, 10:54 AM

Is there any classic surge limiting circuit for the PSU if the ripple cap is over 10000uF ?

richie00boy · 15th June 2007, 11:14 AM

Those diodes will be more than enough for a power amplifier of the power you want, without any surge protection. I run 20A diodes in a 1x400W system that I use for parties and have never had a problem.

djk · 15th June 2007, 01:10 PM

A 6A general purpose rectifier

http://www.onsemi.com/pub/Collateral/MR750-D.PDF

has a 60hz surge current of 400A, the MUR3060 is only 150A (per leg).

A 2R5 inrush current limiter

http://www.cantherm.com/products/the...therm_mf72.pdf

works well in most audio amplifier applications. The 2R5 model is rated for 5A and less than 0R095 at that current. In very large amplifiers (above 100W/ch) you may want to short it out with a relay after a short delay.

I have lost 400A surge rectifiers with caps as small as 27,000µF, it is also dependant on the resistance in your transformer windings (bigger transformers are harder on rectifiers).

lgreen · 15th June 2007, 05:43 PM

Quote:

Originally posted by ozonek
Is there any classic surge limiting circuit for the PSU if the ripple cap is over 10000uF ?

I've done this before-

Soft Start Circuit

Implemented in Krell Clone

15th June 2007, 05:00 AM	#2
sandyK diyAudio Member Join Date: Apr 2007 Location: Sydney	Is MUR3060 good for bridge rectifier Generally these fast devices have a much lower surge rating than the KBPC3510. Look at this parameter in their data sheets. If you have a lot of capacitance in the PSU, it may be worthwhile using some kind of surge limiter to reduce current for a short period on switchon. Otherwise the fast devices may fail, This has been reported in several forum postings. SandyK

15th June 2007, 11:14 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Those diodes will be more than enough for a power amplifier of the power you want, without any surge protection. I run 20A diodes in a 1x400W system that I use for parties and have never had a problem. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

15th June 2007, 01:10 PM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	A 6A general purpose rectifier http://www.onsemi.com/pub/Collateral/MR750-D.PDF has a 60hz surge current of 400A, the MUR3060 is only 150A (per leg). A 2R5 inrush current limiter http://www.cantherm.com/products/the...therm_mf72.pdf works well in most audio amplifier applications. The 2R5 model is rated for 5A and less than 0R095 at that current. In very large amplifiers (above 100W/ch) you may want to short it out with a relay after a short delay. I have lost 400A surge rectifiers with caps as small as 27,000µF, it is also dependant on the resistance in your transformer windings (bigger transformers are harder on rectifiers). __________________ Candidates for the Darwin Award should not read this author.

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15th June 2007, 10:54 AM	#3
ozonek diyAudio Member Join Date: Jun 2006	Is there any classic surge limiting circuit for the PSU if the ripple cap is over 10000uF ?

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