Auto-tuned, discrete PID controller for DC-DC converter for fast transient response

Ziegler-Nichols tuned PID controller's performances usually are not acceptable for applications requiring precise control. In this paper an improved discrete auto-tuning PID scheme is developed for DC-DC converters where large load changes are expected or the need for fast response time. The algorithm developed in this paper is used for the tuning discrete PID controller to obtain its parameters with a minimum computing complexity and is applied to Synchronous buck converter to improve its performance. To improve the transient response and rise time of the Converter, the controller parameters are continuously modified based on the current process trend. For its implementation a synchronous buck converter is designed and its MATLAB/Simulink model with non-linear parameters is developed and considered. Also, the non-linear effects such as S/H, quantization, delay, and saturation are considered in the close loop model. The simulation results demonstrate the effectiveness of the developed algorithms.

[1]  D. Maksimovic,et al.  Automated Digital Controller Design for Switching Converters , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[2]  Kevin L. Moore,et al.  Relay feedback tuning of robust PID controllers with iso-damping property , 2005, IEEE Transactions on Systems, Man, and Cybernetics, Part B (Cybernetics).

[3]  B. Johansson,et al.  Possibilities of obtaining small-signal models of DC-to-DC power converters by means of system identification , 2000, INTELEC. Twenty-Second International Telecommunications Energy Conference (Cat. No.00CH37131).

[4]  S. S. Ang.  A practice-oriented course in switching converters , 1996 .

[5]  Tore Hägglund,et al.  The future of PID control , 2000 .

[6]  Chanchal Dey,et al.  An improved auto-tuning scheme for PID controllers. , 2009, ISA transactions.

[7]  Yun Li,et al.  PID control system analysis, design, and technology , 2005, IEEE Transactions on Control Systems Technology.

[8]  Wei Zhao,et al.  FPGA implementation of closed-loop control system for small-scale robot , 2005, ICAR '05. Proceedings., 12th International Conference on Advanced Robotics, 2005..

[9]  Tore Hägglund,et al.  Automatic Tuning of Pid Controllers , 1988 .

[10]  D. Maksimovic,et al.  System identification of power converters with digital control through cross-correlation methods , 2005, IEEE Transactions on Power Electronics.

[11]  C. Hang,et al.  Refinements of the Ziegler-Nichols tuning formula , 1991 .

[12]  Chanchal Dey,et al.  An improved auto-tuning scheme for PI controllers. , 2008, ISA transactions.

[13]  D. Maksimovic,et al.  Practical on-line identification of power converter dynamic responses , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[14]  George A. Perdikaris.  Computer Controlled Systems , 1991 .

[15]  XI. REFERENCES , 1966, Carbanion Chemistry.

[16]  K. Åström,et al.  Revisiting the Ziegler-Nichols step response method for PID control , 2004 .

[17]  Chang Chieh Hang,et al.  Towards intelligent PID control , 1989, Autom..

[18]  S. Saggini,et al.  Autotuning of Digitally Controlled DC–DC Converters Based on Relay Feedback , 2007, IEEE Transactions on Power Electronics.

[19]  T. W. Martin,et al.  Digital control for switching converters , 1995, 1995 Proceedings of the IEEE International Symposium on Industrial Electronics.

[20]  D. Maksimovic,et al.  Impact of digital control in power electronics , 2004, 2004 Proceedings of the 16th International Symposium on Power Semiconductor Devices and ICs.

[21]  Alberto Leva,et al.  PID autotuning algorithm based on relay feedback , 1993 .

[22]  Jianping Xu,et al.  Digital Predictive V2 Control of Switching DC-DC Converters , 2006, 2006 IEEE International Conference on Industrial Technology.