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Author Topic: what is the Crest Factor ?  (Read 1471 times)
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satya
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« on: March 02, 2010, 12:28:05 12:28 »

hi

what is the Crest Factor  in a ups ?

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satya
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explorer
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« Reply #1 on: March 02, 2010, 05:06:45 17:06 »

Google says:
•The crest factor or peak-to-average ratio (PAR) or peak-to-average power ratio (PAPR) is a measurement of a waveform, calculated from the peak ...
en.wikipedia.org/wiki/Crest_factor

•This is the ratio between the peak current and the average current required by the load. Computers normally exhibit a crest factor of 2 to 3 ...
www.noahtec.com/power-glossary-terms.htm

•the ratio of the peak voltage to rms voltage of a signal, which is given by the following formula: For a sine wave the crest factor is 1.414, for ...
zone.ni.com/devzone/cda/tut/p/id/4439

•In an AC circuit, Crest Factor is the mathematical ratio of the peak to RMS values of a waveform. Crest factor is sometimes used for describing ...
www.powerstream.com/glossary.html

•The ratio of the non-linear peak current to the true RMS current. A sine wave has a crest value of 1.4142. For switchmode power supplies this ratio ranges from 2 to 4.
www.powersource.net/glossary.htm

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Triodethom
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« Reply #2 on: March 02, 2010, 05:27:44 17:27 »

 The crest factor is used to explain that the peaks require higher rated parts than an average amount would. Explorer reference are very good. that's why you will see high voltage caps in a switching power supply normally with a good margin of safety and the diodes will be larger than the output by some factor say 3 or more .   
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