Transcription of POWER SUPPLY SPECIAL - bearpwr.com
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POWER SUPPLY SPECIAL - bearpwr.com
POWER SUPPLY SPECIALPOWER SUPPLY SPECIALIn ac/dc POWER convertersabove a few watts, a largeinrush current flowswhen the input capacitorsare suddenly charged duringthe initial application ofpower. If unrestricted, theinrush current can easily ex-ceed 50 A at the peak of theac cycle and severely stress theconverter s fuse and input rec-tifiers significantly reducingthe reliability and life expectancyof the modules. POWER - SUPPLY susceptibilityUniversal POWER supplies are particu-larly subject to high inrush currentsince their input capacitors must belarge enough to handle line voltagesas low as 110 Vac, as well as voltagesas high as 240 Vac at turn-on. Design-ers of commercial, industrial, andmedical systems need to pay specialattention to inrush current. In theseenvironments, a POWER - SUPPLY failureor a tripped circuit breaker can be in-convenient at best, and expensive ordangerous at worst.
POWER SUPPLY SPECIAL I n ac/dc power converters above a few watts, a large inrush current flows when the input capacitors are suddenly charged during
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