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Analysis of high‐power factor AC‐DC boost converter
Author(s) -
Nagao Michihiko,
Nakakohara Takashi,
Jinno Masahito,
Harada Koosuke
Publication year - 1995
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391150613
Subject(s) - boost converter , ripple , power factor , control theory (sociology) , ćuk converter , waveform , flyback converter , buck–boost converter , mathematics , voltage , physics , engineering , electrical engineering , computer science , control (management) , artificial intelligence
This paper presents analysis of a high‐power factor ac‐dc converter with a boost converter operating in the discontinuous conduction mode (DCM) and the critical conduction mode (CRM). The converter can be expressed by a nonlinear differential equation for each mode. The equation in DCM is solved analytically by separating its variable (output voltage) into two terms of a ripple component and a direct component, and by linearizing the equation for the ripple component. On the other hand, the equation in CRM can be solved analytically. Furthermore, the source current waveform of the converter is expanded into the Fourier series. As a result, the output voltage, its ripple and the power factor of the converter in DCM and CRM are derived as a function of the circuit parameters, respectively, and verified experimentally. These equations exhibit clearly the effect of each circuit parameter of the converter and the difference between the converter in DCM and in CRM. The converter operating in CRM produces sinusoidal ac current with unity power factor.