HM28-25028LF

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The HM28-25028LF is a common mode choke with superior corrosion and chemical resistance. It is a passive electronic component used for suppressing interference, filtering noise, and providing electrical isolation. Common mode chokes are widely used in automotive, residential, and commercial applications. This article will discuss the application field and working principle of the HM28-25028LF.

Application Field

The HM28-25028LF common mode choke is typically used in automotive applications such as automotive seat memory, infotainment systems, power windows, airbags, and seat belt warning systems. It is also used to filter high-frequency noise and suppress interference on automotive power and signal lines, and reduce common-mode conducted EMI on power buses. In residential and commercial applications, it can be used to filter interference and reduce conducted EMI on audio, video, and data lines.

The HM28-25028LF is designed for a wide operating temperature range of -40°C to 125°C, which makes it suitable for many demanding commercial and industrial applications, such as for computer networking equipment and other industrial automation. The wide temperature range ensures reliable performance in a variety of environmental conditions.

Working Principle

HM28-25028LF common mode chokes work by using a magnetic field to oppose the flow of radio-frequency interference (RFI). The common mode choke acts as a barrier that blocks interference between the input signal and the output. The HM28-25028LF is a two-winding choke with independent windings that provide more effective filtering by suppressing both common-mode and differential-mode noise. The core material of the HM28-25028LF is high-quality alloy steel, which offers superior conductivity and minimizes losses.

The two windings of the HM28-25028LF act as a coupled inductor. When a differential-mode voltage is applied across the two windings, the windings will induce a current in each other in the opposite direction, creating a magnetic field that opposes the flow of differential-mode currents. The current is thus blocked and the differential-mode noise is filtered out.

For common-mode noise, the two windings of HM28-25028LF are connected in series in the same direction. This allows the two windings to induce a current in the same direction, creating a magnetic field that opposes the flow of common-mode currents, thus blocking the current and preventing the noise from passing through the choke. The core material of the HM28-25028LF plays an important role in this process, as it provides a low-resistance path for the magnetic field to flow through, ensuring maximum efficiency.

Conclusion

HM28-25028LF is a common mode choke with superior corrosion and chemical resistance, making it suitable for a wide range of automotive, residential, and commercial applications. It is designed to filter out high-frequency noise and suppress interference on automotive power and signal lines, reduce common-mode conducted EMI on power buses, and filter interference on audio, video, and data lines. The HM28-25028LF works by using a magnetic field to oppose the flow of RFI, blocking the flow of both common-mode and differential-mode currents and providing efficient noise filtering.

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