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Power-User

Join Date: Jan 2010
Location: Hyderabad
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110V DC Power Supplies Through 240V AC UPS to 110V DC Converter

11/02/2013 1:23 PM

When the 110V DC system is with battery backup, the battery would provide large current during fault (+to- fault) in any of the feeders in the 110V DC UPS and the fuses can blow. But, in case the DC system is depending on the battery backup in 240AC UPS upstream, the current magnitude that can be allowed is limited by the diode/thyristor overcurrent withstand capability which is always small and hence fuses of the faulty feeder do not blow.

Is it a practice to include large capacitors on the output side of diodes!

If so, what will be the current that can be expected (in case of positive-to-negative fault)!

Thanks for sharing your knowledge / experience.

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Raghunath
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Guru

Join Date: Oct 2008
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#1

Re: 110V DC power supplies through 240V AC UPS to 110V DC converter

11/02/2013 3:25 PM

Does it look like this?

Or this?

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Guru

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#2

Re: 110V DC power supplies through 240V AC UPS to 110V DC converter

11/02/2013 4:52 PM
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