Title :
Design of an off-line AC/DC controller based on Skip Cycle Modulation
Author :
Fuhua, Li ; Hanxiang, Wang ; Zhenghao, Lu ; Weiguo, Xie
Author_Institution :
Dept. of Microelectron., Soochow Univ., Suzhou, China
Abstract :
This paper analyses the principles of SCM (skip cycle modulation) in switching converters. A controller for AC/DC flyback converter based on SCM is proposed. Four key building blocks, namely the oscillator, skip cycle comparator, digital control and two control loops are used to achieve skipping cycle control. This circuit is designed in CSMC 0.5 ¿m BCD process and verified by Hspice simulation. The simulation results show that the switching efficiency of the converter is not affected by the change of the load. It solves the problem of low efficiency at light loads in PWM mode.
Keywords :
AC-DC power convertors; PWM power convertors; switching convertors; AC-DC flyback converter; CSMC BCD process; Hspice simulation; PWM mode; digital control; off-line AC-DC controller design; oscillator; size 0.5 mum; skip cycle comparator; skip cycle modulation; skipping cycle control; switching converters; Annealing; CMOS technology; Gallium arsenide; Gold; III-V semiconductor materials; Materials science and technology; Optical pulses; Pulsed laser deposition; Semiconductor diodes; Semiconductor lasers; PWM; skip cycle;
Conference_Titel :
Integrated Circuits, ISIC '09. Proceedings of the 2009 12th International Symposium on
Conference_Location :
Singapore
Print_ISBN :
978-9-8108-2468-6
