北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (1): 198-209.doi: 10.13700/j.bh.1001-5965.2019.0154

• 论文 • 上一篇    下一篇

Boost电路开关瞬间电压尖峰产生机理及抑制方法

于兆龙, 葛红娟, 李尚, 杨帆   

  1. 南京航空航天大学 自动化学院, 南京 211106
  • 收稿日期:2019-04-04 发布日期:2020-01-21
  • 通讯作者: 葛红娟 E-mail:allenge@nuaa.edu.cn
  • 作者简介:于兆龙,男,硕士研究生。主要研究方向:半导体器件建模、高效率逆变技术;葛红娟,女,博士,博士生导师,教授。主要研究方向:矩阵变换器的建模与控制、电机驱动、适航技术等。
  • 基金资助:
    国家自然科学基金(51737006)

Mechanism of voltage spike production during switching transients and its suppression methods in Boost converter

YU Zhaolong, GE Hongjuan, LI Shang, YANG Fan   

  1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • Received:2019-04-04 Published:2020-01-21
  • Supported by:
    National Natural Science Foundation of China (51737006)

摘要: Boost变换器常用作两级式逆变器的前级升压电路,由于电路中寄生参数的存在,开关瞬间输出电压叠加有瞬态尖峰,降低了波形质量,甚至影响逆变器的正常工作。为了抑制直流环节电压尖峰,研究了Boost电路开关瞬态过程,针对瞬态电路开关特性和开关器件工作状态,建立了基于金属氧化物半导体场效应晶体管(MOSFET)和肖特基二极管(SBD)的换流单元的解析模型,进一步分析了不同寄生参数对开关瞬态电流特性的影响,以及导致电压尖峰的机理等。仿真分析了寄生参数与输出电压尖峰大小的关系,提出了“减缓开关速度”和“降低输出端寄生电感”2种从源头抑制输出电压尖峰的方法。仿真和实验表明,这2种抑制方法能够有效减小电压尖峰,提高Boost电路的输出电压性能。

关键词: Boost电路, 开关特性, 电压尖峰, 瞬态模型, 寄生参数

Abstract: Boost converter is often used as the pre-stage circuit in double-stage inverter. Because of the existence of parasitic parameters in the circuit, the output voltage will be superimposed with transient spikes, which reduces the waveform quality and even affects the operation of inverter. In order to suppress the voltage spikes, the switching transient of Boost converter is studied. Aimed at the switching characteristics of transient circuit and the operation status of switching devices, an analytical model of commutation unit based on metal-oxide-semiconductor field-effect transistor (MOSFET) and Schottky barrier diode (SBD) is established, and the influence of parasitic parameters on the current characteristics during switching transient, as well as the mechanism of causing voltage spikes, is analyzed. The relationships between the parasitic parameters and the output voltage spikes are analyzed and compared by simulation, and two methods are proposed to suppress the output voltage spikes, which are "slowing down the switching speed" and "reducing the output terminal parasitic inductance". The validity of these two methods to reduce voltage spikes and improve output voltage performance of Boost converters has been verified by simulation and experiments.

Key words: Boost converter, switching characteristics, voltage spikes, transient model, parasitic parameters

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