CAX-0.4-100

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Common mode chokes (CMCs) are a type of electrical filter commonly used in electronic application circuits to suppress noise and improve signal quality. They are designed to minimize the flow of common-mode currents through a device by restricting electromagnetic interference (EMI). The CAX-0.4-100 is a common mode choke from AT&S group, now widely used in many applications. This paper will discuss the application fields and working principles of the CAX-0.4-100.

Application Field:

The CAX-0.4-100 has been developed for many years and proven to be a reliable and cost-effective solution for various applications in a wide range of industries. It is suitable for use in DC motor drives, inverters and frequency converters, consumer applications such as white goods and home automation, and automotive applications such as powertrains, body controllers, and infotainment systems. It is especially useful for applications where there is a need to suppress common mode noise. Typical applications include signal and control lines, bus systems, audio lines, as well as power lines.

Working Principle:

The CAX-0.4-100 works on the principle of inductive and capacitive reactance to interdict common-mode noise, that is, noise conducted through a shared connection between transmitting and receiving circuits. It consists of two or more coils or windings, each with a preferred direction of current, which are wound magnetically coupled together. These coupled windings form a dual-layer configuration, one for differential-mode and the other for common-mode filtering.

The CAX-0.4-100 has two kinds of core materials; ferrites and high-frequency iron powder cores. When the current passes through one winding, a magnetic field is generated in the ferrite material. The magnetic field of one winding affects the other winding and generates a voltage/current, inducing a counteracting current which cancels out any common-mode currents. This counteracting current causes a voltage drop across the series inductor, leading to a reduction of common-mode current to a minimum.

In addition, the CAX-0.4-100 also utilizes capacitive elements to reduce common-mode noise from capacitive coupling between transverse channels. The capacitive elements intersects the current in different directions, resulting in a voltage drop across the choke. This voltage drop is what is called the common-mode voltage. It helps to further reduce the amount of common-mode current, thus reducing the amount of noise in the circuitry.

The CAX-0.4-100 is a useful addition to many application fields due to its integrated solution for suppressing common-mode noise. It can be an effective, low-cost means of minimizing the effects of EMI from transversal channels. In addition, its dual core technology allows for inductive and capacitive filtering in a single unit, thus making it a more effective solution. The superior power handling capacity and high inductance of this device make it ideal for applications with high currents and long transmission lines.

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