Title :
Robust control of current-mode controlled converters
Author :
Liaw, C.U. ; Chiang, S.J.
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
A robust controller for multimodule current-mode push-pull power converters is presented. First, the small-signal equivalent circuit and transfer function model of the converter system are found. Then the slope compensation is selected and model reduction is performed using the concept of dominant energy mode. Based on the reduced converter models, a PI (proportional-integral) controller is quantitatively and systematically designed to the prescribed specifications. A robust controller is proposed and augmented to improve the control performance when parameter variations caused by system configuration change and by operating point shift occur. The performance of the converter and the effectiveness of the proposed controller are demonstrated by simulated and experimental results
Keywords :
control system analysis; control system synthesis; electric current control; equivalent circuits; power convertors; transfer functions; PI control; current control; design; dominant energy mode; model reduction; multimodule current-mode push-pull power converters; operating point shift; parameter variations; performance; robust; slope compensation; small-signal equivalent circuit; transfer function model; Control systems; Equivalent circuits; Frequency; Power system reliability; Reduced order systems; Robust control; Switches; Switching circuits; Switching converters; Transfer functions;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1993. APEC '93. Conference Proceedings 1993., Eighth Annual
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0983-9
DOI :
10.1109/APEC.1993.290754
