Power source of detailed analyse switch inputs end in all model and anti-noise circuit of wrong standard inductance
[introduction] the alleged signal that need a standard is two size the signal with equal, opposite way. Plan institute is shown is in all model and circuit of wrong standard inductor, this also is the EMI filter in loop of input of report of town of communication of switch power source, the L1 in circuit, L2 is wrong standard inductor, l3 and L4 are in all modular inductor, c1 is X capacitance, c2 and C3 are Y capacitance. This circuit inputs report of 220V communication town, output voltage is added in rectification circuit.
The alleged signal that need a standard is two size the signal with equal, opposite way.
Plan institute is shown is in all model and circuit of wrong standard inductor, this also is the EMI filter in loop of input of report of town of communication of switch power source, the L1 in circuit, L2 is wrong standard inductor, l3 and L4 are in all modular inductor, c1 is X capacitance, c2 and C3 are Y capacitance. This circuit inputs report of 220V communication town, output voltage is added in rectification circuit.
1. In all modular inductor
Switch power source arises in all limits of modular noise frequency from 10kHz ～ 50MHz taller even, for effective attenuation these noise, the requirement is inside this frequency limits in all modular inductor can be offerred enough tall inductance.
Explain should understand before principle of modular inductor job in all in all modular inductor structure, this conduces to understanding in all modular inductor is restrained in all the model is high frequency noise. Plan institute is shown is in all graph of modular inductor objective and structural sketch map.
In all two groups of coil of modular inductor are circled on magnetism annulus, circle same v/LIT all over the ground number, same direction is circled make, it is a group of coil are circled in only left, another group of coil are circled in on the right side of. In all the manganese zinc ferrite that modular coil uses tall magnetism conductance or blame brilliant material, in order to rise in all modular coil function.
(A) normal alternating current has flowed in all modular inductor analysis. If plan institute is shown, 220V alternating current is wrong standard electric current, it has flowed in all if what the direction of modular coil L3 and L4 shows in the graph, strange magnetic field way is opposite and abortion of the report in two coil is quits. At this moment the effect that normal signal electric current basically suffers coil resistor (this one impact is very little) , and a few damp that cause because of leakage feeling (inductance) , the frequency that increases 220V alternating current has 50Hz only, in all amount of modular inductor inductance is not large, so in all modular inductor is very small to inductance of normal 220V alternating current, do not affect 220V alternating current to be opposite overall power supply.
(B) in all modular electric current has flowed in all modular inductor analysis. When in all modular electric current has flowed in all when modular inductor, voltaic direction is shown like plan institute. As a result of in all modular electric current is in it is in modular inductor in all with direction, the generation inside coil L3 and L4 is the same as directional magnetic field, increased the inductance amount of coil L3, L4 at this moment, increased L3, L4 to be opposite namely in all the inductance of modular electric current, make in all modular electric current got bigger inhibition, achieve attenuation in all the purpose of modular electric current, rose to restrain in all the action of modular interference noise.
Add C2 of capacitance of on two Y and C3 to be opposite in all the filter wave action of modular interference noise, in all modular interference got apparent inhibition.
2. Differ modular inductor
Plan institute is shown is graph of objective of wrong standard inductor and structural sketch map, apparent it and in all modular inductor is different.
Magnetism core material has wrong standard inductor 3 kinds. The lowest of unit volume cost of core of iron silicon aluminous magnetic particle, because this suits most,make the civil inductor that need a standard. Iron nickel the 50 prices with core of magnetic particle of iron nickel molybdenum are far core of aluminous magnetic particle of outclass iron silicon, suit for military use and the situation with bulk and a few pairs of performance high demands more.
Plan institute is shown is circuit of wrong standard inductor, l1, L2 and X capacitance series connection form wrong standard inductor loop, because L1, L2 is high frequency to needing a standard the inductance of interference is big, and X capacitance C1 is small to the capacitive reactance of high frequency interference, such will wrong standards disturb noise filter to divide, and in cannot adding the circuitry from the back, achieve control wrong standard the purpose of noise of high frequency interference.
