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首页> 外文期刊>Magnetics, IEEE Transactions on >Conducted EMI Reduction on the Pulse Tube Cryocooler
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Conducted EMI Reduction on the Pulse Tube Cryocooler

机译：降低脉冲管低温冷却器的电磁干扰

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摘要

Pulse tube (PT) cryocoolers can be used to cool SQUIDs, however their electromagnetic interference (EMI) through the conducted high frequency noise currents are normally too large to operate SQUIDs. In this paper, high frequency noise currents of a pulse tube cryocooler system are simultaneously observed at several critical points to analyze conducting paths of the noise currents and to find a solution for this problem. High frequency noise currents are detected by current sensors consisting of a current transformer and a terminating resistor at the secondary side. By covering three-phase power lines and a neutral line connecting the valve motor to the inverter with a copper mesh, and by using it as an additional neutral line, conducted EMI (noise currents) to the cryostat has bee reduced by one fifth. With this treatment, SQUIDs have been operated normally.
机译：脉冲管（PT）低温冷却器可用于冷却SQUID，但是它们通过传导的高频噪声电流产生的电磁干扰（EMI）通常太大而无法运行SQUID。在本文中，在几个关键点同时观察到脉冲管低温冷却器系统的高频噪声电流，以分析噪声电流的传导路径并找到解决该问题的方法。高频噪声电流由电流传感器检测，该电流传感器由次级侧的电流互感器和终端电阻组成。通过用铜网覆盖三相电源线和将阀马达连接到逆变器的中性线，并通过将其用作附加中性线，可将对低温恒温器的传导EMI（噪声电流）降低了五分之一。经过这种处理，SQUID已正常运行。

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