CMS3-1-R Filters

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Common Mode Chokes are cables used to protect sensitive electronic systems from the induction of electromagnetic interference (EMI). The CMS3-1-R is a type of common mode choke designed for low voltage power supply applications, such as industrial automation, medical devices, or audio equipment. It is capable of suppressing EMI from 10kHz to 1GHz with a minimum insertion loss of 0.1dB and a common mode rejection of greater than 40dB.

The CMS3-1-R consists of two parts, an inner and an outer conductor. The inner conductor is made from a high-purity copper wire, and the outer conductor is made from a braid of tinned copper. The choke is constructed in a three-layer winding pattern, which allows it to efficiently suppress both common mode and differential mode EMI in the frequency range of interest. The outer layers of the conductor act as shields, while the inner cable acts as a low inductance core.

The working principle of the CMS3-1-R is based on the skin effect; when high frequencies reach the conductor, the outer layers act as a shield and block the high-frequency noise from reaching the core. This noise is then diverted away from the sensitive electronics that may be connected to the core. Additionally, the wound construction of the cable creates a choke that limits the flow of the noise; this choke reduces the amplitude of the unwanted EMI.

The CMS3-1-R is designed for use in low voltage applications, and therefore has a low resistance of 8 milliohms. This allows it to provide effective EMI suppression without introducing significant resistive losses to the system. Additionally, the choke is temperature-rated to 60°C, making it suitable for use in higher temperature environments.

Overall, the CMS3-1-R is an effective solution for providing effective EMI suppression in a variety of industrial, audio, and medical applications. Its construction allows it to efficiently reduce both common and differential mode EMI, and its low resistance ensures that it does not introduce significant resistive losses to the system. It is temperature-rated for use in higher temperature environments, and has a minimum insertion loss of 0.1dB and a common mode rejection of greater than 40dB.

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