Dual modulation technique for high efficiency in high switching buck converters over a wide load range

Author

Tsai, Jen-Chieh ; Huang, Tsung-Ying ; Lai, Wang-Wei ; Chen, Ke-Horng

Author_Institution

Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

3709

Lastpage

3712

Abstract

The design of a compact size switching converter under high switching operation causes a drastically decreasing in power conversion efficiency. This paper presents a dual modulation technique to improve the power conversion efficiency with a little increase in output ripple. Especially, the trade-off between the output ripple and the efficiency can meet the requirement of the portable devices. Simulation results show that the converter can operate at 5 MHz with a supply voltage from 3V to 4.5V. The output voltage ripple can be kept smaller than 30mV when load current varies from 20mA to 800mA. Besides, the power efficiency is higher than 85% over a wide load current range.

Keywords

modulation; power conversion; switching convertors; compact size switching buck converter design; current 20 mA to 800 mA; dual modulation technique; frequency 5 MHz; portable devices; power conversion efficiency; voltage 3 V to 4.5 V; voltage ripple; Buck converters; Circuits; Complexity theory; Costs; Power conversion; Pulse width modulation; Switching converters; Switching frequency; Switching loss; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on

Conference_Location

Paris

Print_ISBN

978-1-4244-5308-5

Electronic_ISBN

978-1-4244-5309-2

Type

conf

DOI

10.1109/ISCAS.2010.5537750

Filename

5537750