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Old 15th June 2007, 02:24 AM   #1
ozonek is offline ozonek  China
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Question Is MUR3060 good for bridge rectifier?

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.

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Old 15th June 2007, 05:00 AM   #2
sandyK is offline sandyK  Australia
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Default 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.
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Old 15th June 2007, 10:54 AM   #3
ozonek is offline ozonek  China
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Is there any classic surge limiting circuit for the PSU if the ripple cap is over 10000uF ?
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Old 15th June 2007, 11:14 AM   #4
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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.
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Old 15th June 2007, 01:10 PM   #5
djk is offline djk
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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 27,000F, it is also dependant on the resistance in your transformer windings (bigger transformers are harder on rectifiers).
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Old 15th June 2007, 05:43 PM   #6
lgreen is offline lgreen  United States
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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
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