开关电源传导干扰建模与仿真分析

通过对某开关电源的主电路进行建模仿真,对该电路的传导干扰分四种情况进行分析.研究了共模、差模传导干扰的传播形式,并采用仿真分析验证了输入滤波器能有效降低电路的传导干扰.     

舰船通信集成交互调影响评估方法

多部舰载通信电台集成共用一副天线时,因非线性效应产生大量交互调产物,对通信接收信道及舰船电磁环境造成干扰.首先构建交互调产物数学模型,求解出交互调产物数量与通信集成路数和交互调产物阶数之间的关系.然后以超短波通信为例,通过计算交互调干扰对天线带内可用频率资源的最恶劣影响情况,以及交互调产物在天线工作频带内的频率分布情况,给出评估交互调对频域影响程度的方法示例.最后提出降低通信集成路数或高阶非线性效应、天线收发分置、提高发射频率相关性且收发异频等建议措施,减小通信集成受到的交互调影响.     

A line impedance stabilization network for pulse current injection北大核心CSCD

［Objective］Aiming at the deficiency of the existing line impedance stability network (LISN) in the electromagnetic pulse protection capability, a LISN suitable for the pulse current injection (PCI) test of electrical and electronic equipment is proposed. ［Methods］Aiming at the characteristics of high peak value and fast rise of the pulse current in PCI testing, the circuit structure and physical structure of the LISN are improved on the existing basis through PSpice time-domain and frequency-domain simulation combined with engineering design requirements, thereby giving it good nanosecond pulse protection performance and impedance stability at the same time. Pulse current protection performance test and impedance curve test experiments are then designed and carried out.［Results］The experimental results show that the improved LISN can attenuate the injected pulse current by 60 times, while the error of its impedance curve is less than 5% compared with the Type 5 µH LISN in GJB 151B-2013. ［Conclusions］The proposed LISN has good impedance stability and decoupling ability, and can be used in the PCI testing of electrical and electronic equipment in order to protect the power supply and improve the repeatability of testing. © 2023 Chinese Journal of Ship Research. All rights reserved.