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multiple out SMPS checking

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rohantopo

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Hello everyone,
I need to check a multiple output smps for its voltage and current rating.
The input for this SMPS is 380 volts 3 phase without neutral. and there there 7 isolated outputs. I need to test each output for its rated voltage and current. i heard resistive load wont work as the design does not have a neutral. please let me know if there is any other way to test it.

Thanks and regards,
Rohan
 

KlausST

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Hi,

SMPS outputs usually are DC. And it's outputs are isolated from input.
I can't find a cause why resistive load should not work.In my eyes it is the best way to check SMPS.

Klaus
 

SunnySkyguy

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Neutral ( near ground ) has nothing to do with an isolated output, nor does a resistive load.

But best test method is active load test with MOSFET bank and control voltage with current sense and step load tests, cross load regulation etc., water cooled. or external dummy heater load resistors ( ceramic heaters are cheap.) or use Nicrhome wire in water.
 

hobbyckts

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SMPS Output is isolated from the input. So there should be problem testing with resistive load
 

KlausST

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Hi,

SMPS Output is isolated from the input. So there should be problem testing with resistive load
Can you explain where/why you see the problem?

Klaus
 

hobbyckts

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Hi,



Can you explain where/why you see the problem?

Klaus
Sorry it was type writing error. Actually it has to be

SMPS Output is isolated from the input. So there should not be problem testing with resistive load
 

rohantopo

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How can I calculate the wattage of the resistor?
 

rohantopo

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Thank you so much for your responses!
 

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