Application of DC/DC Converter in Secondary Power for Spacecraft
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摘要: DC/DC变换器以其可靠性好、集成度高、体积小、效率高等特点, 在航天工程二次电源系统中得到广泛应用. 但是在DC/DC直流变换过程中容易引入或形成各种干扰噪声, 不仅直接影响供电质量, 而且影响航天器的技术性能及指标. 为解决干扰问题, 提高二次电源的可靠性, 结合航天器实际任务, 讨论分析了DC/DC变换器设计应用中的关键技术, 主要包括软启动设计、滤波设计、EMC设计、可靠性设计、抗辐照设计等. 综合采取上述措施后, 二次电源的可靠性大大提高, 浪涌电流减少至原来的1/20, 输出纹波减少至原来的1/4.通过对二次电源输出电压线的传导发射测试(CE)和二次电源机箱的辐射发射测试(RE), 发现其测量值均低于标准中规定的极限值. 实验结果及工程实际应用结果表明, 所提出的设计方案具有良好的效果.Abstract: In aerospace engineering, it is demanded to design a power system of high-reliability, high performance and strong anti-interference ability, to ensure the life of the spacecraft and its reliable operation. The DC/DC converter has been widely used in the secondary power supply in aerospace engineering attributing to its reliability, high integration, small size, high efficiency. But in the DC conversion process, it is easy to introduce various forms of interference and noise, which directly affects the quality of power supply, and consequently affects the spacecraft's technical performance. To solve the interference problem and improve the reliability of the secondary power supply, a number of key techniques have been discussed on the DC/DC design applications, including: soft-start, filter, Electromagnetic Compatibility (EMC), reliability. After taking corresponding measures, reliability of the secondary power supply has been greatly improved, with surge current being reduced to 1/20 of the original level, and the output ripple being reduced to 1/4 of the original level. The measured data of the CE (Conduction emission) and RE (Radiation emission) tests in the EMC were under the limitation of GJB 151A-97. Results of the experiments and actual application show that the anti-interference design is effective.
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Key words:
- Spacecraft /
- Secondary power /
- DC/DC converter /
- Electromagnetic Compatibility (EMC)
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