CCMBoost变换器输出电容ESR和C的在线监测研究

摘要提出一种非侵入式的在线监测电容方法——基于CCM模式下Boost变换器输出电压纹波的ESR和C的在线监测。在状态监测日益重要的今天，电解电容监测尤为关键。在此背景下，根据以往对电解电容的研究基础，总结了电解电容的失效机理并讨论了相应的电容等效模型和失效判据。在对连续导通模式下Boost变换器的工作状态进行分析的基础上，推导出ESR和C的计算公式。根据理论推导设计相关电路并在Saber中进行了仿真，验证了方案的可行性。同时整个系统具有电路简单，无需电流互感器的优点。79708

毕业论文关键词 Boost铝电解电容在线监测仿真ESR和C

Title Online Monitoring of ESR and C for Output Capacitance in Boost Converter of CCM Mode

Abstract

This paper demonstrates a new method of non-intrusively online monitoring capacitance, which monitors the electrolytic capacitor by ESR and C online based on the Boost converter output voltage ripple in CCM mode。 Nowadays, the circuit state monitoring is becoming increasingly important, and the electrolytic capacitor is extremely crucial to it。 This paper, on the basis of the study on electrolytic capacitor before, sums up the failure mechanism of electrolytic capacitor and discusses its equivalent model ， as well as failure criterion。

According to analysis of boost converter in continuous conduction mode, the ESR and C formula can be derived。 Therefore the corresponding circuits will be designed and the simulation be made in saber to verify the feasibility of the scheme。 At the same time, the whole

system has the advantages of simple circuit and no need for current transformer。

1引言 1

2铝电解电容失效分析 3

2。1铝电解电容的结构及性能特点 3

2。2铝电解电容等效模型及失效分析 5

3基于纹波电压获取铝电解电容容值和等效电阻的理论分析 8

3。1Boost变换器工作模式分析 8

3。2理论推导 10

3。3理论验证 13

4电路设计 18

4。1开关管驱动电路 18

4。1。1MOS管驱动芯片SG3525 18

4。1。2SG3525的工作原理 20

4。1．3SG3525配置 20

4。1。4IR2110驱动加强 21

4。2触发电路 22

4。3采样隔离电路 24

4。4系统电路 24

5仿真结果与分析 26

6结论 35

致谢 36

参考文献 37

第II页本科毕业设计说明书

CCMBoost变换器输出电容ESR和C的在线监测研究:http://www.youerw.com/zidonghua/lunwen_92283.html