Optimal control for sub-unity power factor correction

Document Type

Conference Proceeding

Publication Date



Department of Electrical and Computer Engineering


This paper introduces an optimal control method for input current of a boost converter to reduce the double frequency voltage ripple at the load terminals. Using a calculus of variations method, the ideal current waveform is calculated and it is given as a reference current to a boost converter under a hysteretic control scheme. Both simulation and experimental results show a nearly 50 % reduction in capacitor size while the converter still meets IEC-61000-3-2 (class A) harmonics requirements with a power factor of 0.8 or higher. Therefore, using smaller size capacitors essentially resulted in lower cost, smaller size and higher reliability.

Publisher's Statement

© 2012 IEEE. Publisher’s version of record: https://doi.org/10.1109/ECCE.2012.6342524

Publication Title

2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012