Conventional AC-DC converters usually employ afull wave rectifier bridge with a simple capacitorfilter to draw power from the AC line. This ”bulk”capacitor must be big enough to supply the totalpower during most of each half-cycle, while instantaneousline voltage is below the DC rectifiedvoltage. Consequentely, the line current waveformis a narrow pulse, and the power factor ispoor (0.5-0.6) due to the high harmonic distortionof the current waveform.
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