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Can I
operate the power supply at zero load?
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The
minimum load a power supply can work to and maintain its load regulation is dependant
on the output choke (in a forward converter) it has and the close loop performance of
the power supply. Usually the minimum load for a given power supply is specified.
Minimum load requirements are more applicable on a multiple output power supply where
cross regulation and load regulation get effected. Basically a power supply needs to be
designed to meet the zero load operation criteria.
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It is
the ability of a system to vary the output voltage of a power supply to verify system
performance with respect to it’s input voltage.
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Can I
achieve Load sharing between two multiple output power supplies
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Yes,
provided you have a power supply dedicated to do that. A dedicated power supply should
have:
(a) Post regulated outputs with tight regulation.
(b) If you want N+1 redundancy then the power supply should have ORing diodes for each
of the outputs. This will maintain output voltage in the event of a power supply
developing a fault.
(c) Both power supplies should have a current share signal for each of the outputs to
let the other power supply/ies know the load it is supplying and thus ensure load
sharing between the N power supplies working in parallel.
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What is
the difference between EN60950, EN61010 and EN60601?
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They
are safety standards for the IT, Laboratory Equipment and Medical equipment
respectively.
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Can I
get a power supply with 0.99 power factor to comply with the EN61000-3-2?
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EN61000-3-2 deals with the first 39 harmonics of the input current to the
power supply at AC supply frequency. As long as each of these harmonics are below the
limits set in the EN61000-3-2 standard then the power supply is compliant. You do not
need a power factor of 0.99.
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