A multi-modes charge-pump based high efficiency wide input range DC-DC converter

Author

Guo, Rong ; Liang, Zhigang ; Huang, Alex

Author_Institution

Semicond. Power Electron. Center, North Carolina State Univ., Raleigh, NC, USA

fYear

2010

fDate

12-16 Sept. 2010

Firstpage

2706

Lastpage

2712

Abstract

A high efficiency charge-pump based wide input range DC-DC converter is proposed. The first stage is a multi-modes charge-pump and the second stage is a synchronous buck converter. The charge-pump is unregulated and adaptively switches between 1x, 0.5x, and 0.33x modes according to input voltage. It does the rough voltage conversion while buck converter does the fine voltage regulation. As they exhibit different efficiency tendency within the same input range, the total efficiency can get improved by combining them, especially at high input voltage. Detailed theoretical efficiency analysis and comparison between multi-modes charge-pump and synchronous Buck are given in this paper. The control benefits brought by the two-stage solution of wide input range DC-DC converter are also analyzed. A 10 W prototype is built to verify the benefits of proposed solution. Experiment results show that the highest efficiency improvement is 7% at heavy load and 16% at light load.

Keywords

DC-DC power convertors; charge pump circuits; voltage control; DC-DC converter; charge-pump circuit; fine voltage regulation; power 10 W; rough voltage conversion; synchronous buck converter; Capacitors; Charge pumps; Converters; Equations; Mathematical model; Switching loss; Voltage control; Charge Pump; DC-DC converter; Efficiency; Wide input range;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2010 IEEE

Conference_Location

Atlanta, GA

Print_ISBN

978-1-4244-5286-6

Electronic_ISBN

978-1-4244-5287-3

Type

conf

DOI

10.1109/ECCE.2010.5618049

Filename

5618049