Effects of Imperfect Sinusoidal Input Currents on the Performance of a Boost PFC Pre-Regulator

Abstract

This paper investigates the effects of applying different input current waveshapes on the performance of a continuous-conduction-mode (CCM) power-factor-correction (PFC) boost pre-regulator. It is found that the output voltage ripple of the pre-regulator can be reduced if the input current is modified to include controlled amount of higher order harmonics. This finding allows us to balance the performance of output regulation and the harmonic current emission when coming to the design of the pre-regulator. An experimental PFC boost pre-regulator prototype is constructed to verify the analysis and show the benefit of the pre-regulator operating with input current containing higher order harmonics.

Elimination of electrolytic capacitor through high-voltage driving of LED aided by third-order harmonic current injection

“…Table I compares the expected lifetime of various types of capacitor [4], from which it can be seen that with the elimination of electrolytic capacitor which has a short lifetime, the lifetime of driver circuits can be matched more closely to the lifetime of the LED light source being driven. In applications where a further reduction in output capacitor's size is desirable, the well-known third order harmonic current injection technique can be employed to further suppress the output voltage ripple for a given output capacitor's size, or to achieve a smaller output capacitor's size for a given output voltage ripple's amplitude [5]- [7].…”

A Model Predictive Current Control Method for Achieving a High Efficiency and High Robustness Boost PFC Converter Operation

“…International standards such as IEC-61000-3-2 have been established to limit harmonics that degrade power quality [2]. To satisfy this, Power Factor Correction (PFC) converters are being adopted as AC-DC pre-regulators in power converters [3]- [8].…”