Common mode choke coil is an important part of switching power supply, frequency converter, UPS power supply and other equipment. Working principle of inductor: When the working current flows through two coils wound in opposite directions, two magnetic fields H1 and H2 that cancel each other out are generated. At this time, the working current is mainly affected by the damping of the coil's ohmic resistance and the small leakage inductance at negligible working frequencies. If there is an interference signal flowing through the inductor, the inductor will exhibit high impedance, generating a strong damping effect to attenuate the interference signal.
1.Detailed explanation of the working principle, functions, characteristics and applications of common mode choke coil：
Common mode choke coil is an important part of switching power supply, frequency converter, UPS power supply and other equipment. Its working principle: When the working current flows through two coils wound in opposite directions, two magnetic fields H1 and H2 that cancel each other out are generated. At this time, the working current is mainly affected by the damping of the coil's ohmic resistance and the small leakage inductance at negligible working frequencies. If there is an interference signal flowing through the coil, the coil will exhibit high impedance, generating a strong damping effect to attenuate the interference signal.
2.Functions of common mode choke coil:
Common mode choke coil is essentially a bidirectional filter: on the one hand, it needs to filter out the common mode electromagnetic interference on the signal line; on the other hand, it needs to suppress its own electromagnetic interference from emitting outwards, avoiding affecting the normal operation of other electronic equipment in the same electromagnetic environment. Common mode choke coil can transmit differential mode signals, DC and common mode signals with very low frequencies can pass through, while it presents a large impedance to high-frequency common mode noise, which can be used to suppress common mode current interference.
3.Characteristics of common mode choke coil:
Common mode choke coil adopts ferrite core and double-wire winding, with high common mode noise suppression and low differential mode noise signal suppression capabilities. It is difficult to deform in high-speed signals, small in size, easy to use, and has excellent balance, ease of use, high quality, and other advantages. In addition, it has small impedance in the working frequency band, large impedance at the interference frequency, stable inductance value, good thermal stability, and various structural forms and impedance characteristics can be selected.
Daily applications of common mode choke coil:
1.Switching power supply noise suppression filter
2.Electrostatic noise filter for power lines and signal lines
3.Radiation interference suppressor for converters and ultrasonic equipment, etc.