电子器件Issue(3)：408-411,4.DOI:10.3969/j.issn.1005-9490.2014.03.007
一种新颖的同步BUCK芯片过零检测电路的设计
Design of a Novel Zero-Cross Detection Circuit for Synchronous BUCK Converter
摘要
Abstract
The phenomenon that inductor current flow backward appears when synchronous BUCK converter works in light load mode,and the efficiency of the system will be reduced. In response to this problem,a novel zero-cross detection circuit is designed. By using the channel resistance when the MOS transistor is working in linear region to realize negative threshold voltage for zero-cross detection comparator,the happening of current backward flowing is avoided. Edge occult circuit is also designed to avoid false triggering at switching moment. The zero-cross detection circuit is based on 0. 5 μm BCD technology,and has been carried on HSPICE. The simulation result shows that the negative threshold tolerance is only 9 mV when system ranges in temperature from -25 ℃ to 50 ℃,and the zero-cross detection circuit works well.关键词
BUCK变换器/轻载模式/过零检测/同步Key words
BUCK converter/light load mode/zero_cross detection/synchronous分类
信息技术与安全科学引用本文复制引用
黄苏平,冯全源..一种新颖的同步BUCK芯片过零检测电路的设计[J].电子器件,2014,(3):408-411,4.基金项目
国家自然科学基金重大项目(60990320,60990323) （60990320,60990323）
国家863计划重大项目(2012AA012305) （2012AA012305）
国家自然科学基金面上项目(61271090) （61271090）
四川省科技支撑计划项目(2012GZ0101) （2012GZ0101）
