EMIF04-1K030F3 Filters

EMI/RFI Filters (LC, RC Networks)

EMI/RFI filters, like the EMIF04-1K030F3, are integral components in the functioning of electrical circuits. They are used to protect the device, reduce electro-magnetic interference (EMI) and radio frequency interference (RFI) as well as provide compliance with to electro-magnetic compatibility (EMC) regulations. EMI/RFI filters typically utilizes a combination of inductors (L) and capacitors (C), as well as resistors (R) forming LC, RC networks or combinations thereof. In this article, an overview of the EMIF04-1K030F3\'s application field and working principle will be presented.

Application

The EMIF04-1K030F3 is an EMI/RFI filter suitable for a wide range of applications, such as in measuring devices, instrumentation, audio and video systems, broadcast systems and automated systems. It is typically used when a signal source generates a large noise that affects the quality of the signal, leading to either signal distortion, a decrease in signal-to-noise ratio (SNR) and/or attenuation. EMI/RFI filters are designed to reduce the transfer of high frequency noise between circuits, allowing more accurate and reliable communication of the intended signal.

Working Principle

As previously mentioned, EMI/RFI filters primarily relies on LC, RC networks or combinations thereof. These networks can be formed in either a parallel or series configuration. In the case of the EMIF04-1K030F3, it is a parallel configuration RLC network.

In a parallel RLC network, the inductor and capacitor together form an LC tank circuit. This circuit stores energy in its magnetic and electric field. The resistor, is also placed in parallel and is responsible for regulating the current in the circuit as well as adding some additional noise-filtering capabilities of the filter. It functions to dissipate the energy stored in the LC tank circuit, reducing the resonance effect.

electrical components in EMI/RFI filters are typically intended for EMC compliance. The EMIF04-1K030F3 uses metal-oxide varistors (MOV) and thermal fuses to protect against voltage surges. These components are configured to disconnect the power in the event of an overvoltage condition, protecting the load from damage.

Conclusion

The EMIF04-1K030F3 is an ideal EMI/RFI filter for applications with a wide input range that require reliable protection of its electrical circuits. It is designed to reduce the transfer of high frequency noise between circuits and prevent damage due to voltage surges. The filter relies on a parallel RLC network and uses metal-oxide varistors (MOV) and thermal fuses to provide this protection.