空间电源变换器电磁兼容与非匹配滤波器设计

Electromagnetic Compatibility and Non-matched Filter Design for Space Power Converter

电磁兼容是空间产品设计和测试的一项重要内容,滤波器是抑制电磁干扰和提高可靠性及技术指标的有效手段。简要介绍了电源变换器母线滤波器的特点,对滤波器型式和参数的优化选择原理进行了分析,重点论述了非匹配阻抗滤波器的设计方法,在详细的理论分析基础上得出了准确的非匹配谐振频率点和有效的补偿方法。通过具体案例详细介绍了整个设计过程,并对设计结果进行了最坏情况分析和仿真验证。结果证明:本方法能够有效抑制非匹配谐振,最大程度地降低了对元件参数的精度要求,在任何非匹配阻抗(内阻和负载电阻)情况下,也就是母线电压大范围变化或任何功率等级情况下可保证滤波器的峰值系数小于1.2。

Electromagnetic compatibility(EMC) is an important content in the design and test for aerospace products,and filters are effective methods for suppressing electromagnetic interference(EMI) and improving the reliability as well as technical indicators.In this paper,the characteristics of the filter connecting the main bus and the converter are introduced briefly,the principle for selecting the filter’s optimal type and parameters is analyzed,and the design method for the filter with non-matched impedance is discussed especially.On the basis of detailed theoretical analysis,the accurate non-matched resonance frequency and the effective compensation method are obtained.Through a specific case study,the overall design process is introduced in detail,and the worst-case analysis and simulations on the design result are conducted.Results show that the proposed method can effectively suppress the non-matched resonance and reduce the precision requirement for part parameters to a maximum degree; in any non-matched situation(including internal resista-nce and load resistance),the peaking factor can be kept to be less than 1.2 in the wide range of bus voltage variation or at any power level.