摘要
为解决实际应用中临界导通模式(CRM)下boost转换器软开关时间求解不精确等问题,提出了一种针对非线性电容的分段等效电容模型,基于该模型计算得到最优软开关时间.首先介绍了适用于boost电路谷值开关/零电压开关实现的等效电路,得到软开关谐振过程中的特征微分方程;然后根据非线性微分方程的线性化提出分段等效电容模型,计算软开关过程相关电压电流的解析解;最后利用所求得的解析解迭代得到最优软开关时间.实验结果表明:该方法求得的软开关时间与实际电路的软开关时间的误差在5 ns以内,利用所提出的分段等效电容模型计算的谷值开关/零电压开关时间足够准确,为临界导通模式下boost电路实现软开关提供了指导性的方法.
(CRM) in practical applications,a piecewise equivalent capacitance model for nonlinear capacitors was proposed,and the optimal soft-switching time was calculated based on the model.First,the equivalent circuit suitable for the realization of valley-switching/zero-voltage switching of boost circuit was introduced, and the characteristic differential equation of the resonance process during the soft-switching time was obtained;then the piecewise equivalent capacitance model was proposed according to the linearization of the nonlinear differential equation, and the analytical solutions of voltages and currents was calculated;finally, by using the obtained analytical solutions, the optimal soft-switching time was derived through iteration. Experimental results show that the error between the soft-switching time obtained by this method and the actual circuit is within 5 ns. The soft-switching time calculated by the proposed piecewise equivalent capacitance model is sufficiently accurate, which provides a guiding method for boost circuit to realize soft-switching in practice.
作者
吕典
童乔凌
闵闰
邹雪城
LYU Dian;TONG Qiaoling;MIN Run;ZOU Xuecheng(School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第3期24-28,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(61701184,61640311)。
关键词
软开关
分段等效电容模型
谷值开关
零电压开关
临界导通模式
BOOST电路
oft-switching
piecewise equivalent capacitance model
valley-switching
zero-voltage switching
critical conduction mode
boost circuit
