Design and Simulation of Digital PID Controller for Open loop and Closed Loop Control of Buck Converter

This paper presents an implementation of an open loop and closed loop digital PID controller using microcontroller, 8051 for control of buck converter. The controller is used to change the duty cycle of the converter and thereby, the voltage is regulated. The buck converter, P, PI and PID controller are modeled and are evaluated by computer simulations. It has been found that the transient performance and steady state performance is improved using PID controller. The simulated open loop and closed loop PID controller performance is verified experimentally. The experimental system is found to be more advantageous and cost effective with microcontroller.

[1]  Liping Guo.  Implementation of digital PID controllers for DC-DC converters using digital signal processors , 2007, 2007 IEEE International Conference on Electro/Information Technology.

[2]  V. Yousefzadeh,et al.  Nonlinear digital PID controller for DC-DC converters , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[3]  Jianxin Tang.  PID controller using the TMS320C31 DSK with online parameter adjustment for real-time DC motor speed and position control , 2001, ISIE 2001. 2001 IEEE International Symposium on Industrial Electronics Proceedings (Cat. No.01TH8570).

[4]  John Y. Hung,et al.  Implementation of a fuzzy controller for DC-DC converters using an inexpensive 8-b microcontroller , 1997, IEEE Trans. Ind. Electron..

[5]  Miro Milanovic,et al.  Digitally controlled buck converter , 2004, 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512).

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

[7]  Chin Chang.  Robust control of DC-DC converters: the buck converter , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[8]  T. Ghose,et al.  Converter Based DC Motor Speed Control Using TMS320LF2407A DSK , 2006, 2006 1ST IEEE Conference on Industrial Electronics and Applications.