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航天遥感任务中,为了得到较高的信噪比及系统稳定性,对二次电源供电系统具有较高的性能要求。DC-DC模块具有高可靠性、高集成度、高效率等优点,广泛应用于航空航天工程项目。然而,DC-DC模块在转换过程中,其固有噪声和外界引入噪声会对整个成像系统的EMI产生很大影响。综合EMI/EMC考虑,系统采用母线电源经滤波器进入电源系统,输出单元与负载间引入滤波电路减小输出纹波。最后,针对整个电源板的直流压降及电流密度分布进行仿真分析,确保了工程应用中的稳定性与可靠性。
Space remote sensing mission, in order to get a higher signal to noise ratio and system stability, the secondary power supply system has high performance requirements. DC-DC module with high reliability, high integration, high efficiency, etc., are widely used in aerospace engineering projects. However, the DC-DC module in the conversion process, its inherent noise and noise introduced outside the entire imaging system EMI will have a significant impact. Comprehensive EMI / EMC considerations, the system uses bus power filter into the power supply system, the output unit and the load is introduced between the filter circuit to reduce the output ripple. Finally, the DC voltage drop and current density distribution of the whole power board are simulated and analyzed to ensure the stability and reliability in engineering application.