Power factor improvement using DCM Cuk converter with coupled inductor

Most of the power factor regulator topologies in continuous conduction mode result in bulky magnetics, and in discontinuous conduction mode result in high harmonic content. To solve these problems a Cuk topology is presented in discontinuous conduction mode (DCM) with coupled inductors for power factor regulation, the unique feature exhibited by the converter that makes the converter better than the other converter in DCM operation for power factor regulation. Inductive coupling is used to transfer the ripple from the input to the output side thereby reducing the switching harmonics in the line current. Experimental results obtained on a 500 W prototype are also presented.

[1]  Slobodan Cuk.  Coupled Inductor and Integrated Magnetics Techniques in Power Electronics , 1983, INTELEC '83 - Fifth International Telecommunications Energy Conference.

[2]  Slobodan Cuk,et al.  Input current shaper using Cuk converter , 1992, [Proceedings] Fourteenth International Telecommunications Energy Conference - INTELEC '92.

[3]  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.

[4]  Jose A. Cobos,et al.  The determination of the boundaries between continuous and discontinuous conduction modes in PWM DC-to-DC converters used as power factor preregulators , 1992 .