用于降压型DC-DC转换器的新颖过零检测电路  

A Novel Zero Current Detector for Buck DC-DC Converter

作　　者：朱宁莉 张威[1] 

机构地区：[1]北京大学微电子研究所,北京100871

出　　处：《微电子学》2014年第2期149-152,共4页Microelectronics

摘　　要：针对降压型DC-DC转换器需要工作在电感电流不连续导通模式(DCM)下的场合,设计了一个输出电压自适应的过零检测方案。该方案通过采集输出电压信息来调整检测到电感零电流后的响应时间,使其在输出电压很大时倒灌电流仍然很小。采用0.5μm BCD工艺,在8V输出电压下进行芯片级仿真,结果显示,与传统过零检测电路相比,新电路的倒灌电流减小了66%。A zero current detector（ZCD）with adapted output voltages was proposed for buck DC-DC converters operating in discontinuous-conduction mode（DCM）.In this technique,response time to detected zero inductance current was adjusted by collecting output voltage values,so that the reverse inductance current remained small even at high output voltages.The circuit was simulated based on 0.5μm BCD process at 8Voutput voltage.Simulation results showed that the proposed method could reduce reverse inductance current by 66%,compared to traditional ZCD.

关 键 词：过零检测电路 降压型DC-DC转换器 倒灌电流 不连续导通模式 

分 类 号：TN433[电子电信—微电子学与固体电子学]