source:Industry News Popular:adapter release time:2021-05-11 09:12:04 Article author:sznbone
The figure shows a typical balanced line filter, which is used in offline chargers to limit conducted RFI noise. It can be seen from the figure that two independent inductors L1(a) and L1(b) are wound on the same magnetic core to form a dual-winding common-mode line filter. It can also be seen from the figure that the inductor L2 is one Single winding series inductor.
The figure shows two typical dual-winding common-mode filter inductors.
The common mode filter inductor has two independent windings with the same number of turns. The two windings are connected to the circuit in an inverted manner, so that the series-connected power frequency current can pass through. Therefore, the magnetic field generated by the normal series AC (or even DC) charger current will cancel to zero.
When the two windings are connected in anti-phase and pass a series current, the inductance presented is only the leakage inductance between them. Therefore, the low-frequency line current will not be able to saturate the magnetic core, so materials with high permeability can be used without introducing an air gap in the magnetic core, so that a larger inductance can be obtained with a smaller number of winding turns.
However, for common mode noise (noise current or voltage to ground generated at both ends of the line at the same time), the two windings are parallel and in phase, and exhibit a high inductance under common mode current. Therefore, in order to prevent any effective common mode interference current from being conducted to the input charger circuit, common mode noise current can be introduced into the ground from the bypass circuit through capacitors C1 and C2.
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