Pulse-width-modulated switching converters arepower circuits in which the semiconductor devicesswitch between on and off states at a rate that isfast compared to the frequencies of the input andoutput waveforms. Control of the converter isexercised by varying the ratio of on-time to totalswitching period of the controlling switches,thereby controlling the width of the pulsesapplied to the output. This is called pulse-width modulation orPWM control.
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