Abstract
Current flows to charge a capacitor only when the instantaneous AC voltage exceeds the voltage on the capacitor. Thus, a single phase off-line supply draws a current pulse during a small fraction of the half cycle duration. Between those current peaks, the load draws the energy stored inside the input capacitor. There are two major reasons for the recent surge in interest in power factor correction. The first is that equipment with higher power rating may be operated from the power line when the power factors of the equipment are high, and the second reason is that the IEC standards force manufacturers to apply power factor correction to most equipment. This chapter provides an overview of power factor correction and harmonic control as applied to electronic products and power electronic subsystems.
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