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PEMI6CSP/RW,135 Application Field and Working Principle

EMI/RFI filters, also known as LC, RC networks, are used to reduce the effect of the electric and magnetic fields of electrical and electronic equipment on the surrounding area.

This type of filter is used in applications such as power supplies, motor control systems, medical equipment, telecommunications, audio-video equipment, and any other device where electric or magnetic interference is a concern. In addition, these filters are found in a wide range of industries, including automotive, aerospace, industrial, consumer electronics, and telecommunications.

The working principle of this type of filter requires an alternating current to be passed through an inductor-capacitor (LC) network. The inductor (L) stores energy in the form of a magnetic field, while the capacitor (C) provides an electrical energy storage medium. The LC network produces a frequency-dependent impedance, which is caused by the inductor and capacitor wanting to work in opposition to each other.

The result is a frequency response that is tuned to the frequency of the EMI/RFI source, which provides attenuation of the unwanted signals from the device that is emitting them. The filter also prevents EMI/RFI signals from passing through the device and interfering with other devices.

To ensure reliable operation, the LC network must be designed for the particular application and the desired degree of attenuation. The design process involves selecting the proper components and determining the required frequency response for the application.

Once the LC network is designed, the components must be connected in the correct way to ensure that the circuit performs as intended. This means that the components must be connected in series and parallel arrangements, and the connections must be carefully checked for proper polarity.

EMI/RFI filters are a vital part of any device or system where high levels of electric or magnetic interference are present. With the right components, design, and installation, they can provide reliable attenuation of unwanted signals and reduce the risk of failure due to interference.

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