一种低功耗同步BUCK芯片的过零检测电路设计

同步BUCK芯片在轻载模式下会产生因电感电流倒灌而产生的额外功耗。针对这一问题,设计了一款过零检测电路。该电路采用两个不同电压门限采集技术,并对门限进行温度补偿,有效限制了电感电流的倒灌;同时设计了边沿隐匿电路,避免电路切换时引起的误触发。该过零检测电路基于0.25μm BCD工艺设计,利用HSPICE仿真验证。当系统温度在-40℃~120℃变化时,负阈值电压容差仅为0.2 m V,实现了高精度的过零检测,且静态功耗极低。...

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Bibliographic Details
Published in电子技术应用 Vol. 41; no. 11; pp. 118 - 120
Main Author 周朝阳 冯全源
Format Journal Article
LanguageChinese
Published 西南交通大学微电子研究所,四川成都,611756 2015
Subjects
BUCK变换器
不连续导通模式
轻载模式
过零检测
轻载模式
light load mode
BUCK变换器
不连续导通模式
过零检测
zero-cross detection
BUCK converter
DCM
Online AccessGet full text
ISSN0258-7998
DOI10.16157/j.issn.0258-7998.2015.11.033

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Summary:同步BUCK芯片在轻载模式下会产生因电感电流倒灌而产生的额外功耗。针对这一问题,设计了一款过零检测电路。该电路采用两个不同电压门限采集技术,并对门限进行温度补偿,有效限制了电感电流的倒灌;同时设计了边沿隐匿电路,避免电路切换时引起的误触发。该过零检测电路基于0.25μm BCD工艺设计,利用HSPICE仿真验证。当系统温度在-40℃~120℃变化时,负阈值电压容差仅为0.2 m V,实现了高精度的过零检测,且静态功耗极低。
Bibliography:BUCK converter ; light load mode ; zero-cross detection ; DCM
The synchronous BUCK converter will generate additional power loss caused by the reverse inductor current in the light load mode. A zero-crossing detection circuit was designed for this problem. By using two different thresholds acquisition technology, with the temperature compensation for the threshold,the current backward flowing is avoided;Edge occult circuit is also designed to avoid false triggering at svdtching moment.The zero-crossing detection circuit is designed based on 0.25μm BCD process,and car- fled on HSPICE.The simulation result shows that the negative threshold tolerance is only 0.2 mV when the system temperature vari- ous from -40℃to 120 ℃, and the static power consumeption is very low.
Zhou Chaoyang, Feng Quanyuan （Institute of Microelectronics, Southwest Jiaotong University, Chengdu 611756, China）
11-2305/TN
ISSN:0258-7998
DOI:10.16157/j.issn.0258-7998.2015.11.033