Limit-Cycle Oscillations Based Auto-Tuning System for Digitally Controlled DC-DC Power Supplies

This paper introduces a new method and system for parameter extraction and automated controller adjustment, suitable for low power digitally controlled DC-DC switch-mode power supplies (SMPS). The system allows closed-loop calibration throughout regular converter operation. During a short-lasting te...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power electronics 2007-11, Vol.22 (6), p.2211-2222
Main Authors: Zhao, Zhenyu, Prodic, Aleksandar
Format: Article
Language:English
Subjects:
Applied sciences
Auto-tuning
Automatic control
Calibration
Capacitance
Circuit properties
Control systems
Converters
Digital circuits
Digital control
Dynamical systems
Effectiveness
Electric potential
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical machines
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Frequency estimation
Limit cycle oscillations
limit-cycle oscillations (LCOs)
Limit-cycles
low-power dc-dc converters
Oscillations
Parameter estimation
Parameter extraction
Power electronics, power supplies
Power supplies
Power supply
Regulation and control
Switched-mode power supply
Testing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper introduces a new method and system for parameter extraction and automated controller adjustment, suitable for low power digitally controlled DC-DC switch-mode power supplies (SMPS). The system allows closed-loop calibration throughout regular converter operation. During a short-lasting test phase, SMPS parameters, such as output capacitance and load, are estimated by examining the amplitude and frequency of intentionally introduced limit cycle oscillations in duty ratio control variable as well as from its steady state value. Accordingly, a digital compensator is automatically constructed to provide fast dynamic response and good output voltage regulation. In addition, the load estimation data are used for improving efficiency of a converter having segmented transistors. It is performed through a selection of driving sequence resulting in minimized sum of switching and conduction losses. The effectiveness of the system is demonstrated on an experimental 400 kHz, 9 V-to-3.3 V, 10 W, digitally controlled synchronous buck converter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2007.909307