DLW21SN121HQ2L

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Common Mode Chokes is a type of electronic circuit element that can be used to filter common mode currents. This type of filter is most commonly used in applications that require strong interference rejection, such as certain high power applications like motor control and in sensitive electronic instrumentation applications where the current supply is shared by many sensitive components. The DLW21SN121HQ2L is one particular model of common mode choke, manufactured by Delta Electronics.

DLW21SN121HQ2L Application Field

The DLW21SN121HQ2L is a low cost and reliable common mode choke, designed to improve the EMI compliance in industrial applications. It is suitable for AC and DC applications, with a wide operating temperature range and excellent electrical performance. The DLW21SN121HQ2L is suitable for filtering of common mode interference in power supplies, motor controls, PWM controls, and instrumentation applications. It is also useful for signal line shielding, where it is used to reduce radially emitted EMI and its coupling.

DLW21SN121HQ2L Working Principle

The DLW21SN121HQ2L uses differential currents to filter out common mode currents. The magnetic core of the DLW21SN121HQ2L is designed to provide a high inductance for the differential currents, while providing less inductance for the common mode currents. This filtering is achieved by the device core material, the design of the winding, the core magnetic coupling, and the distributed capacitance.

The differential currents are induced on the windings of the DLW21SN121HQ2L, and the cores of the device act as an impedance to common mode currents. The cores are so designed that the electromagnetic fields created by the differential currents are concentrated within the core, rather than radiated away and causing interference. This helps to reject the common mode current, along with any unwanted frequencies, while allowing the desired frequencies to pass with minimal loss.

The DLW21SN121HQ2L is capable of providing a variety of EMI performance levels, depending on the application requirement. It is important to ensure that the core material chosen is suitable for the application, and that the windings are wound in such a way that the magnetic field is focused within the core and not radiated.

Conclusion

The DLW21SN121HQ2L is a highly reliable and affordable common mode choke, suitable for a variety of applications. Its design ensures excellent EMI performance, with differential current filtering providing excellent common mode interference rejection. The design of the windings and core acts to concentrate the field within the core, minimizing any unwanted EMI caused by the differential current.

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