Title :
Digitally Controlled Flyback Converter with Online Adaptive Tuning and Estimation
Author :
Yuan, Youchen ; Liu, Jun ; Lv, Yongdong
Author_Institution :
Coll. of Autom. & Electron. Eng., Qingdao Univ. of Sci. & Technol., Qingdao, China
Abstract :
This paper introduces design and implementation of a digital controller for an experimental low-power fly back converter in a solar-powered system with power management. Multiple operating modes are used to maintain high efficiency over wide ranges of input voltages and loads. A current, crossover frequency and phase margin estimation technique to perform load-dependent mode switching and control system stability is proposed and tested. An adaptive tuning digital PID regulator design example is described, with emphasis on practical limitations imposed by the LM3S1138 controller and the program of arithmetic due to sampling and processing. Experiment and simulation results of demonstrating system functionality are presented for a fly back converter.
Keywords :
adaptive control; digital control; estimation theory; microcontrollers; power convertors; power generation control; solar power stations; stability; three-term control; LM3S1138 controller; adaptive tuning digital PID regulator; crossover frequency; digital controller; digitally controlled flyback converter; load dependent mode control; load dependent mode switching; low power fly back converter; online adaptive estimation; online adaptive tuning; phase margin estimation technique; power management; solar powered system; stability control; Estimation; Frequency estimation; Regulators; Switches; Tuning; Adaptive tuning; Crossover frequency; Current estimation; Phase margin;
Conference_Titel :
Internet Computing & Information Services (ICICIS), 2011 International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4577-1561-7
DOI :
10.1109/ICICIS.2011.117
