Types of electric currentRectification of a sine wave produces pulsed DC.
Pulsed DC (PDC) or pulsating direct current is a periodic current which changes in value but never changes direction. Some authors use the term pulsed DC to describe a signal consisting of one or more rectangular ("flat-topped"), rather than sinusoidal, pulses.[1]
Pulsed DC is commonly produced from AC (alternating current) by a half-wave rectifier or a full-wave rectifier. Full wave rectified ac is more commonly known as Rectified AC. PDC has some characteristics of both alternating current (AC) and direct current (DC) waveforms. The voltage of a DC wave is roughly constant, whereas the voltage of an AC waveform continually varies between positive and negative values. Like an AC wave, the voltage of a PDC wave continually varies, but like a DC wave, the sign of the voltage is constant.
Pulsating direct current is used on PWM controllers.
^Chapter 2 of "Introductory Signals and Circuits" by Jose B. Cruz, Jr. and M. E. Van Valkenburg, Blaisdell Publishing Company, 1967.
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