Title :
A New Control Method for Switched Buck-Boost DC-DC Converters with Delta-Sigma Modulation for Mobile Equipment
Author :
Kobori, Yasunori ; Furuya, Tetsuya ; Kono, Masashi ; Shimizu, Tsuyoshi ; Kobayashi, Haruo
Author_Institution :
Electron. & Comput. Course, Gunma Univ., Kiryu
Abstract :
This paper presents a new approach to creating high-performance DC-DC converter systems for mobile-phone applications. The required supply voltage is 2.5 V, and the output voltage of recent lithium-ion secondary-batteries ranges from 4.2 V to about 2 V as they discharge. We have developed a bridge-configuration switching regulator that toggles between voltage-buck and voltage-boost modes, and maintains output voltage regulation even with a small input-output voltage differential. It uses delta-sigma modulation, switches smoothly between voltage-buck and voltage-boost modes with plusmn6 mV ripple (at constant load), and load regulation is within plusmn20 mV for a load current step of 0.5 A
Keywords :
DC-DC power convertors; delta-sigma modulation; lithium; mobile handsets; secondary cells; switches; 4.2 to 2 V; Li; bridge-configuration switching regulator; delta-sigma modulation; input-output voltage differential; mobile equipment; mobile-phone; output voltage regulation; secondary-batteries; switched buck-boost DC-DC converters; voltage-boost modes; voltage-buck modes; Batteries; Bridge circuits; DC-DC power converters; Delta-sigma modulation; Pulse width modulation; Pulse width modulation converters; Radio control; Signal processing; Switching converters; Voltage control;
Conference_Titel :
Intelligent Signal Processing and Communications, 2006. ISPACS '06. International Symposium on
Conference_Location :
Yonago
Print_ISBN :
0-7803-9732-0
Electronic_ISBN :
0-7803-9733-9
DOI :
10.1109/ISPACS.2006.364850
