Digital Controller for Single-Phase DCM Boost PFC Converter with High Power Factor over Wide Input Voltage and Load Range

Daying SUN  Weifeng SUN  Qing WANG  Miao YANG  Shen XU  Shengli LU  

IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.4   pp.377-385
Publication Date: 2014/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.377
Type of Manuscript: PAPER
Category: Electronic Circuits
power factor correction,  discontinuous conduction mode,  digital control,  input power factor,  digital pulse width modulator,  

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A new digital controller for a single-phase boost power factor correction (PFC) converter operating at a discontinuous conduction mode (DCM), is presented to achieve high input power factor over wide input voltage and load range. A method of duty cycle modulation is proposed to reduce the line harmonic distortion and improve the power factor. The loop regulation scheme is adopted to further improve the system stability and the power factor simultaneously. Meanwhile, a novel digital pulse width modulator (DPWM) based on the delay lock loop technique, is realized to improve the regulation linearity of duty cycle and reduce the regulation deviation. The single-phase DCM boost PFC converter with the proposed digital controller based on the field programmable gate array (FPGA) has been implemented. Experimental results indicate that the proposed digital controller can achieve high power factor more than 0.99 over wide input voltage and load range, the output voltage deviation is less than 3V, and the peak conversion efficiency is 96.2% in the case of a full load.