Bridge rectifier voltage question

woody · 30th April 2008, 06:53 PM

I have a some 40v schotty rectifiers I would like to use in
a full wave bridge. How do I figure the max ac that a bridge
built with these can handel without exceeding that 40v rating?

I figure that used in a halfwave circuite the max would be ~
14v ac I kind of expect the fullwave configuration would
still have a 14v ac limitation. Kind of related to this I seem
to rember that schotty rectifiers can't be put in seriese for
higher voltage am I right about this?

EWorkshop1708 · 1st May 2008, 01:47 AM

Highest voltage you can use is 40V peak then. (28.28V RMS) I'd recommend 25V or less because it's not hard to kill a rectifier due to overvoltage. IMO high voltage kills the diode easier than high current. I found that out after killing a 45V part.

40V is way low, sounds like it was for 5V or 12V supply. Try a high-voltage super fast diode like MUR3020 or MUR3060. The 3020 is 200V and the 3060 is 600V, both are 30 Amps.

30th April 2008, 06:53 PM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Bridge rectifier voltage question I have a some 40v schotty rectifiers I would like to use in a full wave bridge. How do I figure the max ac that a bridge built with these can handel without exceeding that 40v rating? I figure that used in a halfwave circuite the max would be ~ 14v ac I kind of expect the fullwave configuration would still have a 14v ac limitation. Kind of related to this I seem to rember that schotty rectifiers can't be put in seriese for higher voltage am I right about this?

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1st May 2008, 01:47 AM	#2
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	Highest voltage you can use is 40V peak then. (28.28V RMS) I'd recommend 25V or less because it's not hard to kill a rectifier due to overvoltage. IMO high voltage kills the diode easier than high current. I found that out after killing a 45V part. 40V is way low, sounds like it was for 5V or 12V supply. Try a high-voltage super fast diode like MUR3020 or MUR3060. The 3020 is 200V and the 3060 is 600V, both are 30 Amps.

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