SC-20-100

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Common Mode Chokes are a type of electromagnetic component used to filter out electromagnetic interference. The SC-20-100 is a two-coil common mode choke with an integrated shield that allows it to achieve high common mode noise attenuation. The choke is designed to operate in both power and signal applications, providing a wide range of applications. This article discusses the common mode application fields and working principles of this type of choke.

Common Mode Chokes are used to suppress, reduce, or eliminate common mode current, which is the current that has an equal potential in two directions. This unbalanced current can generate interference in the form of electromagnetic fields. The primary working principle of the common mode choke is to convert the unbalanced current into a balanced current, thus eliminating or reducing the interfering electromagnetic signal.

The SC-20-100 common mode choke is designed to filter out common mode noise from both power and signal lines. It has two windings, one for the power line and the other for the signal line. It also has an integrated shield that helps reduce or completely eliminate common mode noise. In power applications, the common mode choke can reduce cross-talk between circuits, reducing electrical disturbances. For signal applications, the chokes are used to reduce noise and interference in the signals.

The common mode chokes are typically used in applications such as power supplies, data communications, and digital instruments. Power applications include power supplies, data communication boards, and motor control boards. In data communication applications, the chokes are used to reduce electromagnetic interference so that data is transmitted reliably and securely. In digital instruments, the chokes are used to reduce noise while maintaining signal integrity.

The working principle of the common mode choke can be easily understood by considering the effect on an unbalanced current. An unbalanced current flowing in a single wire will generate an electromagnetic field. This field will interact with any conductor or ground potential near it, resulting in interference. However, when the same current flows in two wires, the total voltage is zero, thus reducing the electromagnetic field and its associated interference.

The shield of the SC-20-100 common mode choke helps to reduce the amount of signal leakage between the two windings. As a result, the EMI interference is reduced, allowing more reliable and secure communication over longer distances. The shield also helps prevent accidental coupling to low impedance cables.

In summary, the SC-20-100 two-coil common mode choke is designed for power and signal applications. Its two windings, along with the integrated shield, help reduce common mode noise and interference, enabling the transmission of data reliably and securely over long distances. This type of choke is commonly used in power supply, data communication, and digital instrument applications.

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