摘要在开关电源中,电解电容作为储存能量的元件,理想情况下上是不会损失能量的, 但是在实际应用中,电容器是会产生损耗的,对于这种电解电容,是最容易失效的一种 元件,但是我们并不希望它在短时间内就失效,因为它的性能参数将会直接影响系统的 稳定与可靠,所以有必要在系统运行的时候,能够随时知道电解电容的性能参数。本篇 文章就提出了一种实时的无需侵入系统的监测技术,针对 DCM Buck 变换器,测量其等 效串联电阻 ESR 和 C,在监测时并不需要使用电流传感器,仅采样脉冲宽度调制和输出 交流分量,结合计算模型就可以得到我们想要的实时数据,最后的仿真结果将验证本文 提出的方法具有可行性。80453
毕业论文关键词:电解电容;等效串联电阻和电解电容;仿真模拟;在线监测;DCM Buck 变换 器
毕 业 设 计 说 明 书 外 文 摘 要
Title An Online Monitoring Scheme of Output Capacitor’s ESR and C for CCM Buck Converters Without Current Sensors
Abstract
In the switching power supply, electrolytic capacitors as energy storage element, is ideally not on the loss of energy, but in practical applications, the capacitor will produce losses, for which electrolytic capacitors are the most likely to fail a element, but we do not want it to fail in a short time, because of its performance parameters will directly affect the stability and reliability of the system, so we need when the system is running, it is possible to know at any time the electrolytic capacitor performance parameters。 This article put forward a real-time monitoring technology without having to penetrate a system for DCM Buck converter, measure the equivalent series resistance ESR and C, when the monitor does not require the use of current sensors, only the sampling pulse width modulation and output AC component, combined model can get real-time data we want, the final results of the simulation will verify the proposed method is feasible。
Keywords : electrolytic capacitor; equivalent series resistance (ESR) and capacitance (C); Simulation; online identification; buck converter
目 录
1 绪论 1
1。1 研究背景 1
1。3 本文提出的方法与手段 2
2 DCM Buck 变换器的 ESR 和 C 的计算模型设计 3
3 电路设计 10
3。1 触发电路的设计 10
3。2 IR2110 的功能原理及主要特点 10
3。2。1 IR2110 的功能与特点 10
3。2。2 触发电路原理图与 IR2110 的功能原理 12
3。3 Buck 变换器主电路的设计与器件参数选取 14
3。3。1 Buck 变换器总电路设计 14
3。3。2 Buck 变换器主电路参数的设计与选取 15
3。3。2。1