Rosa Ciprian

Robust Control Design for Various DC-DC Converters Using µ Synthesis

Friday, August 18, 2000
1:00 PM
410 Dana

Abstract

Feedback control of DC-DC converters is a challenging area of research, due to the nonlinearity and time-variant nature of their models. Averaging technique and different linearization methods allow one to work with linear time-invariant models of DC-DC converters. However, the traditional control design associated with each converter assures only nominal stability and nominal performance. Therefore, it is required to design robust controllers that take into account load and component variations (real parameter uncertainties). In this research we use µ synthesis to design robust controllers for various types of converters. In addition to guaranteeing stability for a wide range of load conditions, the proposed controller rejects disturbances at the converter input while maintaining the control input and the settling time within the specification acceptable for practical implementation.

Thesis Committee:
Prof. B. Shafai (advisor)
Prof. B. Lehman
Mr. Sam Nork (Linear Technology Corporation)