Title :
Robust control of multimodule current-mode controlled converters
Author :
Liaw, C.M. ; Chiang, S.J.
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
fDate :
10/1/1993 12:00:00 AM
Abstract :
A robust controller for multimodule current-mode push-pull converters is presented. First, the small-signal equivalent circuit and the transfer function model of the multimodule converter system are obtained. Then, the selection of slope compensation and the model reduction are performed using the concept of dominant energy mode. Based on the reduced converter model, a PI (proportional plus integral) controller is quantitatively designed according to the prescribed regulating specifications using a systematic design procedure. A robust controller is proposed and augmented to improve the control performance when the parameter variations caused by system configuration change and operating point shift have occurred. The performance of the converter and the effectiveness of the proposed controller are demonstrated by simulation and experimental results
Keywords :
electric current control; equivalent circuits; power convertors; transfer functions; two-term control; PI controller; multimodule current-mode controlled converters; operating point shift; reduced converter model; robust controller; simulation; slope compensation; small-signal equivalent circuit; system configuration change; transfer function model; Circuits; Control system synthesis; Control systems; Helium; Optimal control; Power system reliability; Reduced order systems; Robust control; Switching converters; Transfer functions;
Journal_Title :
Power Electronics, IEEE Transactions on