TY - JOUR
T1 - Time-domain design of digital compensators for PWM DC-DC converters
AU - Peretz, Mor Mordechai
AU - Ben-Yaakov, Shmuel
N1 - Funding Information: Manuscript received November 29, 2010; revised February 22, 2011 and May 10, 2011; accepted June 6, 2011. Date of current version December 16, 2011. This work was supported by The Israel Science Foundation under Grant 476/08. The work of M. M. Peretz was supported by the Adams Fellowship Program of the Israel Academy of Sciences and Humanities. This paper is an expanded version of a paper that was presented at the IEEE Applied Power Electronics Conference (APEC) 2007, Anaheim, CA. Recommended for publication by Associate Editor P. Mattavelli.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - A time-domain design method for the digital controller of pulsewidth modulation dc-dc converters was developed. The proposed approach is based on the fact that the closed-loop response of a digitally controlled system is largely determined by the first few samples of the compensator. This concept is used to fit a digital PID template to the desired response. The proposed controller design method is carried out in the time domain and, thus, bypasses errors related to the transformation from the continuous to discrete domain and to discretization. The method was tested by simulations and experimentally. Digital PID controllers for experimental buck- and boost-type converters were designed according to the proposed method and implemented on a TMS320LF2407 DSP core. The measured closed-loop attributes were found to be in good agreement with the design goals. The study was further expanded to investigate the possible realistic closed-loop performance that can be obtained from a system that is controlled by a PID template controller, as well as the stability boundaries of the proposed time-domain controller design approach. The results of the study delineate a normalized map of deviation from the target closed-loop performance goals possible for PID control of switch-mode converters and the areas in which the use of this control law is feasible.
AB - A time-domain design method for the digital controller of pulsewidth modulation dc-dc converters was developed. The proposed approach is based on the fact that the closed-loop response of a digitally controlled system is largely determined by the first few samples of the compensator. This concept is used to fit a digital PID template to the desired response. The proposed controller design method is carried out in the time domain and, thus, bypasses errors related to the transformation from the continuous to discrete domain and to discretization. The method was tested by simulations and experimentally. Digital PID controllers for experimental buck- and boost-type converters were designed according to the proposed method and implemented on a TMS320LF2407 DSP core. The measured closed-loop attributes were found to be in good agreement with the design goals. The study was further expanded to investigate the possible realistic closed-loop performance that can be obtained from a system that is controlled by a PID template controller, as well as the stability boundaries of the proposed time-domain controller design approach. The results of the study delineate a normalized map of deviation from the target closed-loop performance goals possible for PID control of switch-mode converters and the areas in which the use of this control law is feasible.
KW - Closed-loop performance
KW - DC-DC power converters
KW - Digital control
KW - Digital signal processing
KW - Discrete-time analysis
KW - PID control
KW - Pulse width modulation converters
KW - Stability analysis
KW - Time-domain analysis
KW - Voltage-mode control
UR - http://www.scopus.com/inward/record.url?scp=83655172887&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2011.2160358
DO - 10.1109/TPEL.2011.2160358
M3 - Article
SN - 0885-8993
VL - 27
SP - 284
EP - 293
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 1
M1 - 5928425
ER -