A novel variable duty cycle control to achieve optimal reduction of the electrolytic capacitor ripple current for DCM Boost PFC Converter

In power factor correction (PFC) converter, an electrolytic capacitor (E-Cap) is usually used, which has the shortest lifetime. The mathematical relationship between the root mean square (RMS) value of E-Cap's ripple current and the converter's parameters are derived in this paper for DCM boost PFC converter. The corresponding 3rd input current harmonic is figured out for the optimal reduction of the ripple current RMS value so that the E-Cap's lifetime can be greatly improved. A method of fitting the variable duty cycle and the simplified circuit implementation are further proposed. Compared with the constant duty cycle control (CDC), the variable duty cycle control (VDC) also achieves efficiency improvement as the critical inductance is increased and the peak and RMS current value of the power components are therefore decreased. The experimental results from a prototype of 120W are given to verify the effectiveness of the analysis.

[1]  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.

[2]  Issa Batarseh,et al.  Comparison of basic converter topologies for power factor correction , 1998, Proceedings IEEE Southeastcon '98 'Engineering for a New Era'.

[3]  Keyue Smedley,et al.  A topology survey of single-stage power factor corrector with a boost type input-current-shaper , 2001 .

[4]  Shu Fan Lim,et al.  A simple digital DCM control scheme for boost PFC operating in both CCM and DCM , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[5]  Oscar Garcia,et al.  Power factor correction: a survey , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[6]  Luciano S. C e Silva,et al.  Experimental evaluation of the bridgeless interleaved boost PFC converter , 2012 .

[7]  Chi K. Tse,et al.  A family of PFC voltage regulator configurations with reduced redundant power processing , 2001 .

[8]  M. Hasegawa,et al.  A comparison of various buck-boost converters and their application to PFC , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[9]  Chi K. Tse,et al.  A theoretical examination of the circuit requirements of power factor correction , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[10]  T. Kurachi,et al.  Analysis of ripple current of an electrolytic capacitor in power factor controller , 1995, Proceedings of 1995 International Conference on Power Electronics and Drive Systems. PEDS 95.

[11]  Oscar Garcia,et al.  A new family of single stage AC/DC power factor correction converters with fast output voltage regulation , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[12]  J.C. Balda,et al.  Lifetime of Electrolytic Capacitors in Regenerative Induction Motor Drives , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[13]  Sarath Perera,et al.  Lifetime analysis of aluminum electrolytic capacitor subject to voltage fluctuations , 2010, Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010.

[14]  Milan M. Jovanovic,et al.  Comparison between CCM single-stage and two-stage boost PFC converters , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).