基于同步整流技术的Buck变换器研究  

Buck Converter Research Based on Synchronous Rectifier Technology

作　　者：刘东立 张逸凡 李欣桐 刘华宇 Liu Dongli;Zhang Yifan;Li Xintong;Liu Huayu(Heilongjiang University of Science and Technology,School of Electrical Engineering and Automation,Harbin 150027,Heilongjiang)

机构地区：[1]黑龙江科技大学电气与控制工程学院,黑龙江哈尔滨150027

出　　处：《电动工具》2020年第2期21-25,共5页Electric Tool

基　　金：黑龙江省2019年大学生创新创业训练计划(201910219072)。

摘　　要：Buck变换器作为一种基本的开关电源变换器,在电力变换场合具有广泛的应用。为解决Buck变换器工作在电感电流连续状态下,续流二极管关断时存在较大的反向电流过冲问题,采用了同步整流技术。用MOS管代替续流二极管,通过控制电路输出180°互补的PWM波来驱动开关MOS管和续流MOS管,消除了续流结束时的反向尖峰电流,提高Buck变换器的效率,减小开关MOS管的电应力,降低整个设备的电磁干扰,提高变换器运行可行性。分析带有同步整流技术的Buck变换器工作原理,对其进行电路仿真,仿真结果验证整个变换器具有可行性与实用性。As a basic switching power converter, Buck converter is widely used in power conversion field. In order to solve the problem of reverse spikes at the time of turning off fly-wheel diode when Buck converter works in continuous inductance current state, synchronous rectifier technology is adopted. MOS tube is used instead of fly-wheel diode. MOS tube and fly-wheel MOS tube are driven by 180°complementary PWM wave through control circuits, which eliminates reverse peak current at end of continuous current, improves efficiency of Buck converter, reduces the electric stress of MOS switch tube and the electromagnetic interference of whole equipment, and improves the feasibility of converter operation. Working principle of Buck converter with synchronous rectifier technology is analyzed and its circuit simulation is carried out. Simulation results verify feasibility and practicability of whole converter.

关 键 词：BUCK 续流二极管 尖峰电流 同步整流 

分 类 号：TM911[电气工程—电力电子与电力传动]