Detection of instability and adaptive compensation of digitally controlled switched-mode power supplies

This paper demonstrates the feasibility of detecting an onset of instability by monitoring the pattern of the output voltage error signal, and adaptively changing the compensator parameters in a digitally controlled switched-mode power supply. The techniques are verified on an experimental 90 W, 50 V-to-15 V forward converter where an abrupt change in operating conditions that leads to instability is emulated by removing the input filter damping. It is shown that the system can regain stability and return to regulation. The proposed techniques have potential applications in decentralized active stability control of power management and distribution systems typical for aerospace applications

[1]  R. D. Middlebrook,et al.  Input filter considerations in design and application of switching regulators. , 1976 .

[2]  Robert W. Erickson,et al.  Physical origins of input filter oscillations in current programmed converters , 1992 .

[3]  Karl Johan Åström,et al.  Computer-Controlled Systems: Theory and Design , 1984 .

[4]  Philip T. Krein,et al.  Preventing instability in DC distribution systems by using power buffering , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[5]  Keith R. Godfrey,et al.  Rule-based autotuning based on frequency domain identification , 1998, IEEE Trans. Control. Syst. Technol..

[6]  Steven B. Leeb.  Foreword special issue on digital control in power electronics , 2003 .

[7]  Mehrdad Ehsani,et al.  Stability analysis of large DC solid-state power systems for space , 2000 .

[8]  Scott D. Sudhoff,et al.  Three-dimensional stability analysis of DC power electronics based systems , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[9]  D. Maksimovic,et al.  A modified cross-correlation method for system identification of power converters with digital control , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[10]  K. Siri.  Study of system instability in current-mode converter power systems operating in solar array voltage regulation mode , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[11]  A. Prodic,et al.  Design of a digital PID regulator based on look-up tables for control of high-frequency DC-DC converters , 2002, 2002 IEEE Workshop on Computers in Power Electronics, 2002. Proceedings..

[12]  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..

[13]  Fred C. Lee,et al.  Impedance specification and impedance improvement for DC distributed power system , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[14]  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.

[15]  Eyad H. Abed,et al.  Instability monitoring in boost converters by resonant perturbation and control , 2001, Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148).