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Title: An improved LQR-based controller for switching dc-dc converters
Authors: Leung, FHF 
Tam, PKS
Li, CK
Issue Date: Oct-1993
Source: IEEE transactions on industrial electronics, Oct. 1993, v. 40, no. 5, p. 521-528
Abstract: In a previous paper, an account had been given to the various aspects for the control of PWM-type switching dc-dc converters, and an LQR-based digital combined observer controller had been proposed. This paper reports the progress on further research in this topic. It is found that the design of the state estimator (observer) according to the previous paper will lead to a steady-state error in the output voltage in comparison with the reference value and there are difficulties in designing state estimators for converters with uncertain parameters. This paper presents an improved design so that the drawbacks mentioned above can be overcome. By applying the theory of state-variable feedback, a general approach for controlling PWM-type switching dc-dc converters with or without 'unstable' zeros, and capable of achieving good regulation and rejection to modest disturbances, will be presented. An application example based on a published Ćuk converter will also be given.
Keywords: Electric converters
Error analysis
State estimation
Switching systems
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE transactions on industrial electronics 
ISSN: 0278-0046
EISSN: 1557-9948
DOI: 10.1109/41.238013
Rights: © 1993 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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