Design of power factor corrector for the off-line isolated buck/boost converter by a voltage-follower technique

A voltage-follower controller (VFC) formed by the usual PWM controller is proposed that improves the power factor of the isolated buck/boost (flyback) power converter in the discontinuous conduction mode (DCM). The presented VFC can adaptively control the line current in phase with the input line voltage to achieve nearly unity power factor under the full-load condition. An isolated 50 W buck/boost power converter with VFC in DCM is realized that improves the power factor to 0.994.<<ETX>>

[1]  George C. Chryssis.  High-frequency switching power supplies: Theory and design , 1984 .

[2]  Martin F. Schlecht,et al.  Active Power Factor Correction for Switching Power Supplies , 1987, IEEE Transactions on Power Electronics.

[3]  F.C. Lee,et al.  Design and analysis of a hysteretic boost power factor correction circuit , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[4]  Thomas H. Barton,et al.  Considerations on the Application of Improved Power Factor Converter Structures , 1983, IEEE Transactions on Industry Applications.

[5]  K.-H. Liu,et al.  Current waveform distortion in power factor correction circuits employing discontinuous-mode boost converters , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[6]  Phoivos D. Ziogas,et al.  An AC-to-DC Converter with Improved Input Power Factor and High Power Density , 1986, IEEE Transactions on Industry Applications.

[7]  Phoivos D. Ziogas,et al.  A novel active current waveshaping technique for solid-state input power factor conditioners , 1991 .

[8]  Otmar Kilgenstein.  Switched-mode power supplies in practice , 1989 .

[9]  J. B. Williams,et al.  Design of feedback loop in unity power factor AC to DC converter , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[10]  Richard Keller,et al.  Unity Power Factor off Line Switching Power Supplies , 1984, INTELEC '84 - International Telecommunications Energy Conference.