Modeling and analysis of Buck converter based on parallel current mode control strategy

In this paper, a novel control method is introduced which refers to the concept of parallel current-mode control algorithm to obtain good dynamic performance for Buck converter undergoing a rapid load change and input voltage change. The duty cycle consisting of two terms: voltage term and current term is simple for implementation .Since there are only three additions and two multiplications. Besides, the small-signal model of parallel current-mode controlled Buck converter is presented for the design of compensator to satisfy steady and dynamic requirement of the system. The simulation not only verifies the validity of the compensation, but also demonstrates that the parallel current mode control has superior performance as compared with peak mode control.

[1]  Yan-Fei Liu,et al.  Large-signal modeling of hysteretic current-programmed converters , 1996 .

[2]  Bin Wu,et al.  A direct duty cycle calculation algorithm for digital power factor correction (PFC) implementation , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[3]  Thierry Meynard,et al.  Implementation of a Peak-Current-Control Algorithm Within a Field-Programmable Gate Array , 2007, IEEE Transactions on Industrial Electronics.

[4]  P. Cooke,et al.  Modeling average current mode control [of power convertors] , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[5]  Jianping Xu,et al.  Nonlinear PID in Digital Controlled Buck Converters , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[6]  Chunping Song,et al.  Accuracy analysis of hysteretic current-mode voltage regulator , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[7]  Xiaodong Liu,et al.  Research and simulation of parallel current-mode controlled buck converter , 2008, 2008 3rd IEEE Conference on Industrial Electronics and Applications.

[8]  Tore Undeland,et al.  Power Electronics: Converters, Applications and Design , 1989 .

[9]  Yan-Fei Liu,et al.  High Performance Digital Control Algorithms for DC-DC Converters Based on the Principle of Capacitor Charge Balance , 2006 .

[10]  Yan-Fei Liu,et al.  A Quick Capacitor Charge Balance Control Method to Achieve Optimal Dynamic Response for Buck Converters , 2007, 2007 IEEE Power Electronics Specialists Conference.

[11]  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).

[12]  Jian Sun,et al.  Dynamics of Current-Mode-Controlled DC-to-DC Converters with Input Filter Stage , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[13]  Dan Chen,et al.  Small-signal modeling of DC converters with digital peak-current-mode control , 2008, 2008 IEEE Power Electronics Specialists Conference.