common mode choke basics
The common mode choke, as the name suggests, is used to filter out electronic noise that are common to both the power (live) and the return line. In other words, the common mode choke is used to filter out the electronic noises that are coupled to both the power and the return lines.lmost all electronics circuits require the use of COMMON MODE CHOKES to filter out the conducted switching and Radio Frequency noise coming from the power sources such as Switching Mode Power Supplies (SMPS) or other line power outlets.