Capacitors are often used as noise suppression components. But they are not always the optimal solution because they discharge the noise to the ground. Ferrite cores, however, can suppress noise without grounding.
Ferrites have the ability to attract magnetic flux. Hence, when a cable is passed through a ferrite core, it creates a concentrated magnetic field inside the core, which is eventually converted to heat. This heat gets dissipated along with the magnetic loss of the ferrite, which prevents noise emission. That is how ferrite cores can suppress noise without grounding.
Ferrite cores or ferrite beads are also used in case electromagnetic and radio frequency energies interfere with low-level signals. They dissipate high-frequency energies as minute levels of heat energy and, depending on the nature and frequency of the interference, redirect the EMI/RFI signals back down the cable, away from the devices. For long HDMI and digital cable runs, where the wire passes through areas of strong interference, ferrite cores are effective.
この記事は Electronics Bazaar の August 2018 版に掲載されています。
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この記事は Electronics Bazaar の August 2018 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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