In recent years, Power electronic devices are wildly used in the military, industry, agriculture, life and high-tech applications, and power electronics has become one of the key technologies in the field of engineering. But due to wide applications of the electronic products, serious harmonic waves are produced. Now power factor correction has become one of necessary means which can satisfy the requirements of environmental protection. It is one of the key technologies in the future development of switching.
In this paper, Boost circuit for APFC had been analyzed in detail. First, the paper is the Introduction of this paper and mainly introduces the basic concept of PFC, the development of Power Factor, scientific research at home and abroad and the main content of this paper. Second, it briefly introduces the passive power factor correction, then it describes the fundamental principle of the APFC in detail, the control methods, the main circuit topology of APFC, and compares the performance of PFC circuit. Third, it analyzes BOOST topology, describes in the control work patterns of CCM, then designs the overall structure of the Boost AFPC circuit. Fourth, it presents the calculated process of the main circuit’s parameters and results, which mainly includes boost inductor, the output capacitor and power devices. Fifth, it explains the interior structure and working principles of the integrated chip-UC3854 which is commonly used in APFC control, then presents the calculated process of the controlled circuit’s parameters and results, which mainly includes the multiplier’s settings, the oscillation frequency identification, the peak current limit, the design of dynamic circuit and feedback the preliminary design of the compensation network. Finally, Chapter 6 summarizes the full text, sums up the contents of this paper, and puts forward the idea of further work.
Key words Harmonic, Active Power Factor Correction(APFC), Boost Converter, CCM,
UC3854