DocumentCode :
3383924
Title :
Constant switching frequency techniques for sliding mode control in DC-DC converters
Author :
Agostinelli, M. ; Priewasser, Robert ; Marsili, Stefano ; Huemer, Mario
Author_Institution :
Networked & Embedded Syst., Univ. of Klagenfurt, Klagenfurt, Austria
fYear :
2011
fDate :
25-27 July 2011
Firstpage :
1
Lastpage :
5
Abstract :
Sliding mode is a very effective control strategy for switch mode DC-DC converters. However, its widespread adoption has been hampered by some of the drawbacks inherent to this control technique. Among these, the most important is apparently the varying operating frequency, which can cause electromagnetic interference (EMI) problems. This problem is particularly critical in portable devices (e.g. smartphones, e-readers) where it is highly desirable that the DC-DC converters operate at a constant switching frequency to avoid interferences with other parts of the system. Several methods have been proposed in previous literature to stabilize the operating frequency of sliding mode controllers. In this paper, some of the most promising techniques are evaluated and applied to a specific test case, i.e. a Buck converter for a wireless system. A detailed model of the DC-DC converter has been developed in order to obtain realistic results. The system parameters have been chosen to reflect an actual commercial application.
Keywords :
DC-DC power convertors; power control; variable structure systems; buck converter; constant switching frequency technique; electromagnetic interference; sliding mode controllers; switch mode DC-DC converter; Clocks; Frequency control; Hysteresis; Sliding mode control; Switches; Switching frequency; Synchronization;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nonlinear Dynamics and Synchronization (INDS) & 16th Int'l Symposium on Theoretical Electrical Engineering (ISTET), 2011 Joint 3rd Int'l Workshop on
Conference_Location :
Klagenfurt
Print_ISBN :
978-1-4577-0759-9
Type :
conf
DOI :
10.1109/INDS.2011.6024831
Filename :
6024831
Link To Document :
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