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| Common mode radiation analysis and suppression of electronic control system for attitude-control flywheel |
| AN Jing1，2，WU Yi-hui1 |
| 1. National Key Lab of Applied Optics， Changchun Institute of Optics， Fine Mechanics and Physics，Chinese Academy of Sciences，Changchun 130033，China； 2. Zhejiang Industry Polytechnic College， Shaoxing 312000， China |
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Abstract In order to reduce the electromagnetic interference to other electronic equipment, the common mode radiation caused by the heat-sink and switch tube jointly was analyzed using the common mode radiation source of the PWM full bridge circuit as the object of study. The calculation mode of aluminum heat-sink with fins was established. The energy coupling and radiation emission mechanism of the heat-sink was analyzed by means of the numerical calculating method. The suppression effects of shield plate size, position and ventilation holes on the radiation were discussed regarding shield as the main radiation suppression method. The improved structure of the shield plate was also put forward. It was shown that the using of two shielding plates placed in correct position could effectively suppress the radiation. And the longer the shield plate, the better the common mode radiation suppression effect. If there were holes on shield plate then its radiation would be higher than the situation without holes, but the number of holes had little effect on radiation. Using the improved structure, the common mode radiation suppression effect was better than the original model, especially in the 3.9 GHz narrow band range.
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Published: 28 June 2014
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姿控飞轮电控系统共模辐射分析与抑制
为降低飞轮电控系统对其他星载电子设备的电磁干扰，以PWM全桥电路共模辐射源为研究对象，重点分析由开关管和散热片协同导致的共模辐射．建立铝制带鳍散热片计算模型，应用有限元数值计算法分析散热器能量耦合及辐射发射机理，以屏蔽作为主要抑制手段，研究屏蔽板尺寸、放置位置及通风孔对共模辐射抑制效应，并进一步提出屏蔽板改进结构．计算结果表明：使用2块屏蔽板在正确放置时就可有效抑制辐射，且屏蔽板越长，对共模辐射抑制效果越好；屏蔽板上有孔缝存在，对应的辐射就要比无孔时高，开孔个数本身对辐射的影响并不大．改进后的结构对共模辐射抑制效果更优于原结构，尤其体现在3.9 GHz窄频带范围内．
关键词：
姿控飞轮,
共模辐射,
带鳍散热器,
有限元法,
屏蔽板,
通风孔
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