A Current Mode Buck/Boost DC-DC Converter With Automatic Mode Transition and Light Load Efficiency Enhancement

被引：4

作者：

Ma, Yanzhao ^{[1
]}

Wang, Shaoxi ^{[1
]}

Zhang, Shengbing ^{[2
]}

Fan, Xiaoya ^{[2
]}

Zheng, Ran ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Sch Software & Microelect, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Sch Comp Sci, Xian 710072, Peoples R China

来源：

IEICE TRANSACTIONS ON ELECTRONICS | 2015年 / E98C卷 / 06期

基金：

中国国家自然科学基金;

关键词：

automatic mode transition; buck/boost; current mode; high efficiency; BUCK-BOOST CONVERTER; DESIGN; FEEDFORWARD;

D O I：

10.1587/transele.E98.C.496

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A current mode buck/boost DC-DC converter with automatic mode transition is presented in this paper. At heavy load, a control scheme adaptively changes operation mode between peak and valley current modes to achieve high efficiency, small output voltage ripple, and fast transient response. The switching loss is reduced by operating in pure modes, and the conduction loss is reduced by decreasing the average inductor current in transition modes. At light load, the equivalent switching frequency is decreased to reduce the switching loss. An automatic mode transition between heavy load PWM mode and light load PFM mode is achieved by introducing an average load current sensing method. The converter has been implemented with a standard 0.5 mu m CMOS process. The output voltage ripple is less than 10mV in all modes, and the peak efficiency is 95%.

引用

页码：496 / 503

页数：8

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