Small-signal analysis and simulation of fuzzy controlled buck converter

In this paper, a fuzzy control method is introduced for Buck converter and a Proportional-Differential (PD) like fuzzy controller is designed. The nonlinear characteristics of the PD like fuzzy controller in small-signal range are analyzed. The analysis shows that the PD like fuzzy controller is equivalent to a modified PD controller which provides an additional correction action. The PD like fuzzy controller can provide faster correction than the conventional PD controller. Therefore, the dynamic performance of the closed loop system could be improved. The simulation under fuzzy control is compared with the simulation under Voltage Mode Control, using Matlab/Simulink. The simulation results demonstrate that fuzzy control has superior performance as compared with Voltage Mode Control.

[1]  Fred C. Lee,et al.  Small-signal modeling of average current-mode control , 1993 .

[2]  Myung-Joong Youn,et al.  A new small signal modeling of average current mode control , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[3]  George Kopasakis.  Fuzzy current-mode control and stability analysis , 2000, Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022).

[4]  P. C. Sen,et al.  DC-to-DC buck converters with novel current mode control , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[5]  C. Q. Lee,et al.  Comparison of fuzzy logic and current-mode control techniques in buck, boost and buck/boost converters , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[6]  Marian K. Kazimierczuk,et al.  Voltage loop of boost PWM DC-DC converters with peak current-mode control , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.

[7]  M. H. Pong,et al.  DSP based fuzzy controlled power converter operating in both continuous and discontinuous conduction modes , 1996, Proceedings of the 1996 IEEE IECON. 22nd International Conference on Industrial Electronics, Control, and Instrumentation.

[8]  Chunxiao Sun,et al.  Discussions on control loop design in average current mode control [PWM DC/DC power convertors] , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[9]  Yan-Fei Liu,et al.  Digital control of switching power converters , 2005, Proceedings of 2005 IEEE Conference on Control Applications, 2005. CCA 2005..

[10]  G. Feng,et al.  A new current mode fuzzy logic controller with extended state observer for DC-to-DC converters , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..