Common Mode Chokes: How They Reduce Electromagnetic Interference
Electromagnetic interference (EMI) is defined as the disturbance of caused by the electromagnetic field emitted by electrical appliances. The degradation or obnoxious performance of the electronic system could arise from noise and the resulting system malfunction. This is further aggravated in places crowded with electronic structures, for example, charger transformers and power supply cores. In these situations, engineers try to incorporate several techniques, and one of they is using common mode chokes.
How common mode chokes do work?
Common mode choke is an inductor that is made specifically for eliminating high-frequency noise on the power lines of electronic circuits. They have the task of selectively removing interfering signals running parallel to the length of any cable, accordingly, reducing the extent of electromagnetic interference. In such cases, those chokes constitute an Indispensible component where they are put into use as in charger transformers to ensure the signal is not disturbed.
The Principles of Operation of Common Mode Chokes
The functioning of common mode chokes is primarily based on inductance. When a high-frequency noise current flows through the choke coils, a magnetic field is generated that counteracts the current change thereby enabling the choking of the noise. This helps to equalize the differential signals in the circuit and hence the interference is minimized. In regard to the charger transformers, such devices are essential in ensuring that the voltage levels are steady and information is not distorted when power is supplied.
Usage of Charger Transformers in Device Applications
Charger transformers are used in devices such as laptops, smartphones and tablets to receive the ac mains power supply and charge the dc batteries. Such transformers have a good level of susceptibility to the EMI because of their switching mode of operation. With the help of introducing such common mode chokes in the design, the amount of electromagnetic interference caused by the charger can be alleviated so that a non-invasive charger can be used without any negative effects on the components or communication systems.
To conclude, chokes of the common mode type are efficient tools in countering electromagnetic interference. They are a great help regarding signal fidelity, increasing safety of devices and ensuring normative provisions approval. For engineers looking for high-grade components to use in their designs, looking for LIWANG HIGH-TECH. Due to our status in the sphere of production of efficient common mode chokes and other electronics, we are ready to meet your engineering needs.