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High-power-factor single-stage converter with robust controller for universal off-line applications

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3 Author(s)
Tsai-Fu Wu ; Power Electron. Appl. Res. Lab., Nat. Chung Cheng Univ., Chia-Yi, Taiwan ; Sihh-An Liang ; Yu-Kai Chen

This paper presents a robust-controlled single-stage converter (SSC) operating either in discontinuous conduction mode (DCM) or in continuous conduction mode (CCM) to achieve high power factor for universal line voltage range from 90 to 264 Vrms. At light load, the proposed system is operated in the DCM, while at heavy load the system is operated in the CCM, thus, the DC-link voltage can be properly controlled within a certain voltage range and the efficiency can be improved as well. The overall system is with a robust controller and is operated in a fixed frequency. In the design, the load variation and line voltage variation are treated as plant uncertainty and control disturbance, respectively. The H robust control method is adopted to design a proper robust controller to achieve robust stability and robust performance. The measured results from a prototype have confirmed the effectiveness and feasibility of the proposed system

Published in:

Power Electronics, IEEE Transactions on  (Volume:14 ,  Issue: 6 )

Date of Publication:

Nov 1999

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