低功耗同步BUCK芯片过零检测电路的设计与实现  

A Zero-Crossing Detection Circuit for BUCK Chip

作　　者：沈萍[1] 

机构地区：[1]广西职业技术学院,广西南宁530226

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2017年第6期825-828,共4页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：广西壮族自治区教育厅项目(KY2016YB610)

摘　　要：在轻载模式下,传统过零检测电路会出现"电流倒灌"现象,为了获得性能更优的开关电源变换器,设计了一种低功耗同步BUCK芯片过零检测电路.首先通过电压门限采集和温度补偿提高放大电路的稳定性,大幅度降低"电流倒灌"现象出现的概率,然后采用边沿隐匿电路避免出现电路切换误触发操作,最后采用仿真实验对其性能进行测试与分析.结果表明,当温度处于-40~120℃时,电路的负阈值门限为0.1mV,提高了BUCK转换器的效率和系统的检测精度,而且系统功耗非常低,保证了开关电源工作的稳定性.In the light load mode,the traditional zero detection circuit will be ＂the reverse current phenomenon＂,in order to obtain the switching power converter with better performance,this paper designs a low-power BUCK chip synchronous zero detection circuit.The voltage stability threshold acquisition and temperature compensation is used to improve the amplifier circuit,greatly reduced ＂the reverse current phenomenon＂of probability,and then hidden edge is used to avoid false triggering circuit switching operation,the simulation experiments were conducted to test and analysis of its performance.The results show that when the temperature is -40~120℃,the negative threshold circuit for 0.1 mV,the proposed method improve the detection efficiency and accuracy of the BUCK converter.And the system power consumption is very low,and ensures the stability of switching power supply.

关 键 词：过零检测电路 轻载模式 BUCK芯片 温度补偿 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]