UT2020-003

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Common mode chokes are a type of electric noise suppression equipment used to reduce the transmission of interference or noise in the power system. The most commonly used type of common mode choke is called the UT2020-003. The UT2020-003 application field is for the suppression of electromagnetic interference (EMI) at frequencies up to 500 MHz. It is especially useful in low voltage applications where high frequency noise can cause interference with signal and data lines.

The UT2020-003 is constructed of two inductors wound in opposite directions on the same core, followed by a capacitive load. This combination of inductors creates what is known as a “balanced response”, which is a form of noise cancellation. The capacitive load then helps to further reduce the level of EMI transmitted by the power system, as well as other nearby electrical noise sources. The combination of these two components, the balanced response of the inductors and the capacitive load, provides effective suppression of EMI.

The working principle of the UT2020-003 is based on a two-stage filtering system that attenuates both common-mode and differential-mode interference. In the first stage, the two inductors act to provide a balanced response that attenuates differential-mode noise. In the second stage, the capacitive loading acts to shape the filter\'s response even further to both common-mode and differential-mode, providing greater attenuation of EMI.

The UT2020-003 is highly effective in suppressing EMI generated form power supply lines, allowing for the transmission of clean, interference-free power at high frequencies. When used in combination with other noise suppression products, such as capacitor-based suppressors or ferrite beads, the UT2020-003 can provide effective noise suppression even at higher frequencies, ensuring the power system remains stable and reliable.

In conclusion, the UT2020-003 is an effective solution for suppressing electromagnetic interference in the power system. Its two-stage filtering system provides balanced response to both common-mode and differential-mode interference to provide maximum suppression of EMI. In combination with other suppressors, the UT2020-003 can provide even greater levels of noise reduction, ensuring a clean and reliable power supply.

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