Inverters, Chapter 23

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Abstract

Inverters are used to create single or polyphase AC voltages from a DC supply. In the class of polyphase inverters, three-phase inverters are by far the largest group. A very large number of inverters are used for adjustable speed motor drives. The typical inverter for this application is a ‘‘hard-switched’’ voltage source inverter producing pulse-width modulated (PWM) signals with a sinusoidal fundamental [11]. Recently research has shown detrimental effects on the windings and the bearings, resulting from unfiltered PWM waveforms and recommend the use of filters [8,21]. A very common application for single-phase inverters are so-called uninterruptable power supplies (UPS) for computers and other critical loads. Here the output waveforms range from square wave to almost ideal sinusoids. UPS designs are classified as either ‘‘off-line’’ or ‘‘on-line.’’ An off-line UPS will connect the load to the utility for most of the time and quickly switch over to the inverter if the utility fails
Original languageEnglish
Title of host publicationInverters, Chapter 23
PublisherCRC Press
Pages23-1-23-7
ISBN (Print)9780849392931
StatePublished - May 30 2007

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