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Common Mode Chokes

Common mode chokes, more commonly referred to as "chokes" or "impedance chokes", are an essential component in almost any DC-based system. They are used not only to reduce interference from other components, but also to increase electrical isolation to ensure that the system runs smoothly and safely. The ALFT-04-2 is a type of common mode choke that has a wide range of applications in a myriad of industries. In this article, we explore the various applications of the ALFT-04-2 and its working principle.

ALFT-04-2 Application

The ALFT-04-2 common mode choke is a small, flat device measuring 7mm wide, 8mm long, and 3.2mm thick. Its miniature size makes it ideal for thin, compact spaces, and its wide application field provides a broad range of options for various applications. Some of the primary applications of the ALFT-04-2 include:

• Power supplies – Chokes are used for filtering and preventing interference from harmful electromagnetic interference (EMI) in power supplies to ensure a more optimized performance.
• DC motor control – The ALFT-04-2 is used in motor control systems where it prevents common-mode noise and interference from other components, allowing the motor to run more efficiently.
• Industrial machinery – The ALFT-04-2 choke is used in industrial machinery such as automated robotic arms or welding machines to ensure that the system remains free of interference and functions smoothly.
• Cable shielding – Cable shielding helps reduce interference in a variety of electronic components, and the ALFT-04-2 provides a reliable and cost-effective solution.

ALFT-04-2 Working Principle

Chokes are basically passive components composed of magnetic cores, insulated windings, and terminals. The primary working principle of a common mode choke is based on magnetic flux coupling and electromagnetic field cancellation. In a common mode choke, the airflow between windings is blocked so as to produce a pair of magnetic poles. As current passes through the pair of windings, they create two orthogonal electromagnetic fields that are 180 degrees out of phase. This produces a magnetic attraction between the two fields, essentially cancelling each other out. The result is a low-resistance path for the current in one direction while providing high resistance for the current in the opposite direction.

The ALFT-04-2 specifically employs a six-level wire bridge that works to reduce common-mode voltage and noise. It operates on a low profile structure with an integrated magnetic core and two windings that create a low pass filter, allowing only signals with frequencies below the specified frequency to pass through the choke. This helps to reduce high frequency interference and improve the overall signal integrity.

Conclusion

The ALFT-04-2 common mode choke is a versatile device with a wide range of applications in various industries. It is also lightweight and compact, making it an ideal choice for thin and confined spaces. Its working principle employs a six-level wire bridge that helps reduce common-mode voltage and noise for improved signal integrity. With its broad range of applications and its reliable performance, the ALFT-04-2 choke is a smart choice for countless projects.

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