Common mode Choke, also known as common mode choke, is a closed magnetic ring, in which coils with opposite directions and the same number of turns are wound symmetrically. The ideal common-mode choke can suppress the common-mode interference between L (or N) and E, but has no inductive suppression effect on the differential-mode interference between L and N.. However, the incomplete symmetry of actual coil winding will lead to the generation of differential mode leakage inductance. When the signal current or the power supply current flows in the two windings, the directions are opposite, and the generated magnetic fluxes cancel each other, so that the choke coil presents a low impedance. Common-mode noise current (including disturbance current caused by ground loop, also called longitudinal current) flows through the two windings in the same direction, and the generated magnetic fluxes are added in the same direction, so the choke presents high impedance, thus playing a role in suppressing common-mode noise.
Comin modd choke yn yn y bôn deugyfeiriadol hidlo: ar y un llaw, dylai hidlydd allan y y modd cyffredin electromagnetig ymyrraeth ar y signal llinell, arall dylai atal ei hun oddi allyrru electromagnetig ymyrraeth i osgoi effeithio y arferol gwaith arall electronig offer yn yr un yr un yr un electromagnetig amgylchedd. % ����% e2��% e2�% 82% 80% e2% 80% 80% 82
Common-mode choke can trosglwyddo modd gwahaniaethol arwyddion, DC a amledd isel gwahaniaethol-modd signalau can pasio trwy, ond mae'n anrhegion mawr rhwystriant i amledd uchel modd cyffredin sŵn, felly gall yn defnyddio i suppress cyffredin modd cyfredol aflonyddwch.
Cais o modd cyffredin tagu yn Switching Power Supply?
Common modd tagu weithiau galw cyffredin-modd tagu oherwydd ei swyddogaeth yw i suppress it. Mae'n yn yn yn yn newid cyflenwad cylchedau i ffurflen amrywiol hidlo EMI a suppress y tonnau a gynhyrchir gan amrywiol cyflymder uchel signalau o allyrru tuag allan. Fel dangos yn y llinellau cyfochrog yn y cylched, a normal signalau yn yn sylfaenol yn sylfaenol maent pasio drwy. Fodd bynnag% 2c pan modd cyffredin cyfredol llifo, due i yr un cyfeiriad o modd cyffredin cyfredol, bydd cynhyrchu A Magnetig maes yn y y Coil Creu y coil, Gwneud y coil yn ymddangos Fel uchel rhwystriant.
1. Diagram diagram o signal pasio trwy cyffredin modd tagu.
Schematic diagram of the front stage of switching power supply, in which L1 is common mode choke. In order to suppress common-mode interference, we know that common-mode signal is a signal with equal amplitude and phase, and the noise it produces is ground noise, which is the noise of two wires respectively. After understanding the common-mode noise, we will know why common mode choke is connected to the AC side.
