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Old 5th April 2010, 11:27 PM   #1
exurbia is offline exurbia  Australia
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Default multiple SMPS

This may be a simple question, I certainly hope it has a simple answer.

Can SMPS supplies be parallel connected , and if so how do you stop power imbalance ?
I.E get equal loads on them.

TIA, Peter.
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Old 6th April 2010, 03:24 AM   #2
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There is no simple answer. In order to share loads, the load currents must be monitored and the appropriate drive adjustments made. Other solutions can work but some will degrade regulation, such as series equalizing resistors.
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Old 6th April 2010, 03:51 AM   #3
exurbia is offline exurbia  Australia
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Dagnabbit, I kinda thought there would be no simple answer otherwise my load resistors wouldn't have started smoking as the power supplies started whining.....
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Old 6th April 2010, 06:21 AM   #4
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Quote:
Originally Posted by exurbia View Post
Can SMPS supplies be parallel connected , and if so how do you stop power imbalance ?
yes, but they must be designed that way, current limited... even better,they need to have this option, current sharing, I have seen this on many

but still, I think you can do it with any, but you will need resistors on output of each of them
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Old 6th April 2010, 06:37 AM   #5
exurbia is offline exurbia  Australia
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Yeah, i was told by an "smps expert" to use a 56k 5 watt resistor on each unit to force current sharing. I wired it all up as suggested, turned it on with a load attached and the R's caught fire. The smps' just whined like crazy and now won't stop whining. They are like a small dog.....
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