A common-mode inductor, common-mode filter and switching power supply electromagnetic compatibility circuit

Abstract

The invention is suitable for the field of electronics, and provides a common mode choke, a common mode filter and a switching power supply electromagnetic compatible circuit. The common mode choke comprises an amorphous magnetic core which is made from an amorphous material, a first winding and a second winding, wherein the first winding is wound outside the outer wall of the amorphous magnetic core, a dotted terminal of the first winding is an input end of the common mode choke and is connected with a zero line, and a synonym end of the first winding is and an output end of the common mode choke; and the second winding and the first winding are homonymously wound around the outer wall of the amorphous magnetic core, a dotted terminal of the second winding is another input end of the common mode choke and is connected with a live wire, and a synonym end of the second winding is another output end of the common mode choke. The common mode choke provided by the embodiment adopts the amorphous material to produce the magnetic core, a coil is wound around the outer wall of the amorphous magnetic core to form a common mode winding, so that the saturation induction density of the common mode choke is increased to two times, a noise suppression effect is increased, turns per coil are reduced, and the temperature stability and frequency bandwidth are improved.

Description

technical field [0001] The invention belongs to the field of electronics, and in particular relates to a common-mode inductor, a common-mode filter and a switching power supply electromagnetic compatibility circuit. Background technique [0002] With the increasing application of switching power supplies in industrial and household appliances, the mutual interference between electrical appliances has become an increasingly serious problem, and the electromagnetic environment has become more and more concerned by people. There are many types of electromagnetic interference, among which the common mode interference between 10KHz and 30MHz is a very important type. They are mainly transmitted in the form of conduction, which causes great harm to the safe and normal operation of the instrument and must be controlled. A common-mode filter is usually added at the input end to reduce external common-mode interference from entering the electrical appliance through the power line, an...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a common mode inductor, which aims to solve the problems of low saturation magnetic induction, low magnetic permeability, poor temperature characteristics and narrow frequency band of the existing common mode inductors.

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