正激类拓扑DC/DC变换器关断过程中肖特基尖峰研究  

Research on Schottky Peaks in the Turn-off Process of Forward Topology DC/DC Converters

作　　者：吴悠然 吴小波 蔡可红[1] WU You-ran;WU Xiao-bo;CAI Ke-hong(No.43 Research Institute of CETC,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第43研究所,合肥230088

出　　处：《混合微电子技术》2020年第3期27-32,共6页Hybrid Microelectronics Technology

摘　　要：在DC/DC变换器的研究和设计中,开启阶段和稳态工作阶段受到较多关注,较多的研究也集中于此。然而,关断过程中的瞬态变化时常会带来一些意想不到的情况,可能使得电路中的某些器件承受较大应力,给DC/DC变换器带来可靠性问题,这点易被忽视。本文聚焦于正激类拓扑关断过程中肖特基二极管的工作状态,通过分析关断过程中欠压保护电路、PWM调制电路、取样反馈电路等模块的下电时序,研究关断时肖特基二极管的尖峰问题,提出解决方案并实际验证。In the research and design of DC/DC convertor,most attention and researches have focused on the start-up phase and steady-state operation stage.However,the transient changes in the turn off process often bring some unexpected situations,which may cause some devices to bear greater stress in the circuit and bring reliability problems to the DC/DC convertor.This paper focuses on the working state of Schottky diode in forward topology turn-off process.By analyzing the power down sequence of undervoltage protection circuit,PWM modulation circuit,sampling feedback circuit and other modules in the process of turn off,the paper studies the spike problem of Schottky diode when switching off,and proposes solutions and practical verification.

关 键 词：开关电源 关断过程 肖特基尖峰 下电时序 

分 类 号：TN402[电子电信—微电子学与固体电子学]