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Observations on a UPS - follow up to a previous post
Arfa Daily wrote:
But that's my point. You can't have a 'true' sine-based RMS figure for power consumers that draw a pulsed current. Just because it is a sine wave that's *available*, it doesn't mean that the load will draw anything like a sinusoidal current, from it. The only items that will are those that are totally 'passive' in nature, such as light bulbs. Even power supplies that are transformer based, are likely to draw current in pulses from the available sinusoidal supply, and switch mode power supplies, on which most modern consumer electronics are based, most certainly won't draw a sinusoidal current from the supply. Arfa ICs to do the true RMS conversion are dirt cheap these days. http://www.analog.com/library/analogDialogue/archives/34-01/rmsarticle/index.html http://www.analog.com/en/subCat/0,2879,773%255F866%255F0%255F%255F0%255F,00.html -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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