A high voltage power EMI filter based on the ceramic capacitor

GAN Hengqian; SUN Jinghai; JIANG Peng; SI Keke

doi:10.16511/j.cnki.qhdxxb.2022.26.035

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (11) : 1789-1795. DOI: 10.16511/j.cnki.qhdxxb.2022.26.035

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A high voltage power EMI filter based on the ceramic capacitor

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Abstract

Radio astronomical observations are very sensitive to electromagnetic interference (EMI), so the EMI from the radio telescope's own electrical equipment must be strictly shielded. The five-hundred-meter aperture spherical radio telescope (FAST) power supply system containing 6 power stations of 10 kV whose shielding effectiveness need to be 90 dB at least. A high voltage, high current EMI filter was built to protect the FAST equipment from the equipment EMI. The EMI filter uses a high voltage ceramic capacitor that can work at 10 kV and 100 A with an insertion loss of more than 90 dB. The core components of the EMI filter are the feed-through ceramic capacitors and an inductor having a group of magnetic rings. Its enclosure is made of 12-cm diameter stainless steel tube that has advantages such as stable performance, simple structure, safe and secure and light weight. Passing the strictly test, the EMI filter was installed on the power station to provide the required shielding effectiveness of 100 dB that meet the FAST electromagnetic environment protection criterion.

Key words

electromagnetic inference / power filter / high voltage ceramic capacitor / shielding effectiveness

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GAN Hengqian, SUN Jinghai, JIANG Peng, SI Keke. A high voltage power EMI filter based on the ceramic capacitor[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(11): 1789-1795 https://doi.org/10.16511/j.cnki.qhdxxb.2022.26.035

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