CMT-8102

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Common Mode Chokes, otherwise known as CM chokes, are a type of passive component used in radio frequency (RF) electronics applications. CM chokes are designed to block high frequency noise on a conductor carrying a signal while allowing low frequency or DC signals to pass through. Examples of common applications include in switches, motors, and power supplies. One such product is the CMT-8102, manufactured and sold by Cornell Dubilier. In this article, we will discuss the application field of the CMT-8102 as well as its working principle.

Application Field of the CMT-8102

The CMT-8102 is a CM choke designed for use in high-voltage AC applications. Its most common applications are in pulse and brush type motors, where it can provide EMI suppression and overload protection. It can also be used to filter out AC line noise in electronic systems. The device has an insulation rating of 3500Vrms, making it suitable for use in industrial as well as household applications.

Typical applications for the CMT-8102 include power supplies, UPS systems, motor drives, power factor correction circuits, pulsed motor controllers, and more. With a rated current of 5A and a weatherproof rating of -40° to +125°C, the device is suitable for a wide range of temperature and current operating conditions. The device is also RoHS compliant, making it suitable for use in environmentally-friendly applications.

Working Principle of the CMT-8102

The CMT-8102 is a band-reject CM choke, meaning it acts as a filter for high and low-frequency signals traveling along the same conductor. It works by allowing signals in the lower frequency range to pass through, while blocking signals in the higher frequencies, reducing noise and interference. The frequency response of the device is specified as -3dB up to 200kHz, providing effective EMI suppression.

The device consists of two sets of windings, a primary and a secondary. The windings are wound with insulated copper wire in a distributed fashion to provide maximum noise suppression. The two sets of windings are wound in a bifilar (twin strand) configuration, meaning that the windings are twisted together in an equal and opposite winding direction. This results in the common mode noise being cancelled out, while allowing the desired signals to pass through. The device is also resistant to the effects of inductive voltage generated by switching transients, providing further protection for sensitive electronic systems.

In addition to its noise-cancelling capabilities, the CMT-8102 also provides high-voltage safety. The device is rated up to 3500Vrms, and it is able to provide noise and interference filtering up to the rated voltage, resulting in improved system performance and safety.

Conclusion

The CMT-8102 is a high-voltage band-reject CM choke, designed for use in a variety of applications. Its high insulation rating, RoHS compliance, and temperature resistance make it suitable for use in industrial, commercial, and household applications. Its ability to reduce noise and interference, coupled with its high-voltage safety, make it an ideal choice for applications such as motor and power supply systems, power factor correction circuits, and more.

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