A High-Efficiency, Ripple-Control Buck Converter with Mode-Hop Enhancement

Author

Rokhsat-Yazdi, Ehsan ; Fzali-Kusha, Ali

Author_Institution

Control & Intell. Process. Centre of Excellence, Univ. of Tehran, Tehran, Iran

Volume

1

fYear

2009

fDate

28-30 Dec. 2009

Firstpage

443

Lastpage

447

Abstract

In this paper, a simple yet efficient auto mode-hop ripple control structure for buck converters with light load operation enhancement is proposed. The converter, which operates under a wide range of input and output voltages, makes use of a state-dependent hysteretic comparator. Depending on the output current, the converter automatically changes the operating mode. This improves the efficiency and reduces the output voltage ripple for a wide range of output currents for given input and output voltages. The sensitivity of the output voltage to the circuit elements is less than 14%, which is seven times lower than that for conventional converters.

Keywords

power convertors; voltage control; buck converters; hysteretic comparator; light load operation enhancement; mode-hop enhancement; mode-hop ripple control structure; output voltage ripple; output voltage sensitivity; Automatic control; Buck converters; Circuits; Dynamic voltage scaling; Hysteresis; Power transistors; Switches; Switching frequency; Zero current switching; Zero voltage switching; Auto-Mode-Hop; Buck Converter; High-Efficiency; Ripple Control; Variable Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer and Electrical Engineering, 2009. ICCEE '09. Second International Conference on

Conference_Location

Dubai

Print_ISBN

978-1-4244-5365-8

Electronic_ISBN

978-0-7695-3925-6

Type

conf

DOI

10.1109/ICCEE.2009.76

Filename

5380448