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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.10 P.1411~1419

10.1631/jzus.A0820142


Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range


Author(s):  Hai CHEN, Meng-lian ZHAO, Xiao-bo WU, Xiao-lang YAN

Affiliation(s):  Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   zhaoml@vlsi.zju.edu.cn

Key Words:  Integrated circuit, Multi-mode controller, Soft-switched flyback converter, Valley detection


Hai CHEN, Meng-lian ZHAO, Xiao-bo WU, Xiao-lang YAN. Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range[J]. Journal of Zhejiang University Science A, 2008, 9(10): 1411~1419.

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author="Hai CHEN, Meng-lian ZHAO, Xiao-bo WU, Xiao-lang YAN",
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%T Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range
%A Hai CHEN
%A Meng-lian ZHAO
%A Xiao-bo WU
%A Xiao-lang YAN
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0820142

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T1 - Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range
A1 - Hai CHEN
A1 - Meng-lian ZHAO
A1 - Xiao-bo WU
A1 - Xiao-lang YAN
J0 - Journal of Zhejiang University Science A
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SP - 1411
EP - 1419
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A0820142


Abstract: 
This paper presents a multi-mode control scheme for a soft-switched flyback converter to achieve high efficiency and excellent load regulation over the entire load range. At heavy load, critical conduction mode with valley switching (CCMVS) is employed to realize soft switching so as to reduce turn-on loss of power switch as well as conducted electromagnetic interference (EMI). At light load, the converter operates in discontinuous conduction mode (DCM) with valley switching and adaptive off-time control (AOT) to limit the switching frequency range and maintain load regulation. At extremely light load or in standby mode, burst mode operation is adopted to provide low power consumption through reducing both switching frequency and static power dissipation of the controller. The multi-mode control is implemented by an oscillator whose pulse duration is adjusted by output feedback. An accurate valley switching control circuit guarantees the minimum turn-on voltage drop of power switch. The prototype of the controller IC was fabricated in a 1.5-μm BiCMOS process and applied to a 310 V/20 V, 90 W flyback DC/DC converter circuitry. Experimental results showed that all expected functions were realized successfully. The flyback converter achieved a high efficiency of over 80% from full load down to 2.5 W, with the maximum reaching 88.8%, while the total power consumption in standby mode was about 300 mW.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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