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Old 15th November 2007, 01:56 PM   #1
jdec is offline jdec  United States
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Default Hypex transformers - OK with USA voltages?

Hello,

A Hypex distributor in the USA told me that the hypex transformers (TR400, TR501, for the ucd400s) won't work well with US voltages (he doesn't sell hypex transformers but his own custom-made ones). He said that they in Hypex didn't account for the high line voltages we often see in the USA so the ucd400 modules will be running on the edge of operation and in some conditions they will cut-out as the overvoltage protection kicks in.

Has anyone in the US have experienced this when using the hypex transformers? or do you recommend me any transformer for this application?

Thanks,
Jov
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Old 15th November 2007, 04:05 PM   #2
Pierre is offline Pierre  France
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Join Date: Nov 2004
Location: Paris
May I suggest that you use a regulated PSU instead? This way you will get the same voltage no matter what the line conditions are.
But if you want to keep it efficient you should use a switching PSU. Coldamp has some good ones.
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Old 15th November 2007, 04:30 PM   #3
glt is offline glt  United States
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The TR501A is a 42V secondary with 115V on the primaries. If you get 125V on your line, then you will get 45.6V on your secondary. This means 64.3V DC. Take 1.3V diode drop and you end up with 63V which is the maximum specification of the UCD400. So yes, you will be running at the edge of the spec...
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Old 15th November 2007, 05:49 PM   #4
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Default Re: Hypex transformers - OK with USA voltages?

Quote:
Originally posted by jdec
Hello,

A Hypex distributor in the USA told me that the hypex transformers (TR400, TR501, for the ucd400s) won't work well with US voltages (he doesn't sell hypex transformers but his own custom-made ones). He said that they in Hypex didn't account for the high line voltages we often see in the USA so the ucd400 modules will be running on the edge of operation and in some conditions they will cut-out as the overvoltage protection kicks in.

Has anyone in the US have experienced this when using the hypex transformers? or do you recommend me any transformer for this application?

Thanks,
Jov
Some of the earlier series transformer did had sometimes to high voltage what did triggered the overvoltage protection. However all transformers now on stock are fine for world wide operation.

BTW. the overvoltage of the UcD400 is at 68V, all caps are rated for 100V and the FETs are rated for 150V. So...the amps will work fine at 63VDC continious..

Cheers,

Jan-Peter
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Old 16th November 2007, 02:27 PM   #5
jdec is offline jdec  United States
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Join Date: Jun 2007
Thanks guys. Looks like any good transformer that is a 40V secondary with 115V on the primaries will do it for me.

Jan-Peter, BTW, is there any real benefit if I use 2 of your HG stereo PSU instead of 2 of the Mono PSU (80,000uF vs 40,000uF)? or why is that the guys at TNT audio and HardwareAnalysis used 2 stereo psu instead of the monos? I'm going to assemble a dual-mono amplifier with 2 ucd400's.

Thanks again,
Jov
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