Title :
PWM/PSM Dual-Mode Controller for High Efficiency DC-DC Buck Converter
Author :
Ye, Yidie ; Qiu, Jianping ; Dong, Lingling ; HE, Lenian
Author_Institution :
Inst. of VLSI design, Zhejiang Univ., Hangzhou, China
Abstract :
This paper introduces a novel method of realizing PWM/PSM dual-mode controller for high efficiency DC-DC buck converters. A minimum duty cycle control module is added to the PWM control loop, and with a simple logic control, the system can work in PSM mode when the load is light to improve the efficiency of the system over wide load range. A testing chip of the dual-mode DC-DC buck converter is implemented by CSMC´s 0.5 ¿m 40 V BCD process. The testing results proved the system functioned well in both PWM mode and PSM mode, and switched smoothly between the two modes. The efficiency is greatly improved when the load is light. It is no less than 75% over the whole load range and can reach 91% with heavy load.
Keywords :
BIMOS integrated circuits; DC-DC power convertors; PWM power convertors; power integrated circuits; BCD process; DC-DC buck converter; PWM PSM dual-mode controller; PWM control loop; duty cycle control; logic control; pulse skipping modulation; size 0.5 mum; testing chip; voltage 40 V; Buck converters; Control systems; DC-DC power converters; Lighting control; Logic; Pulse width modulation; Pulse width modulation converters; Switches; Switching frequency; Voltage;
Conference_Titel :
Power and Energy Engineering Conference (APPEEC), 2010 Asia-Pacific
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-4812-8
Electronic_ISBN :
978-1-4244-4813-5
DOI :
10.1109/APPEEC.2010.5448331
