Inductor need to pay attention to content

Magnetic type:

Core material: There are ferrite, Sendust, manganese core, iron core, nanocrystalline

Wire: Insulated wire

Iron core advantages:

High initial permeability (this is the basic requirements of common mode inductors), high saturation magnetic flux density, temperature stability than ferrite (which can be understood as a small temperature rise), the frequency characteristics of more flexible, because of the high permeability can be small Make a lot of sense, to adapt to a wider frequency;

Overall advantage:

Because the initial permeability is 5-20 times that of ferrite, the inhibitory effect on conducted interference is far greater than that of ferrite.

High saturation magnetic induction of nanocrystals is better than ferrite, so it is not easy to saturate under high current.

The temperature rise is lower than the UF series, I actually test: the temperature is lower by nearly 10 degrees (personal test value for reference only);

Structural flexibility to make it adaptable, from the process of change, you can adapt to different needs (see energy-saving lamps with a magnetic ring inductance, the use of very flexible);

Distribution capacitance will be smaller, because the winding area is wider, the volume is relatively small;

The number of turns used in the ring is less, the distribution parameters are smaller, and the efficiency is better (for the specific analysis, I guess it is due to the diameter of the wire).

Overall disadvantage:

Magnetic aperture is small, difficult to threading the machine, you need to manually around, time-consuming and labor-intensive, high processing costs, low efficiency. This is especially important as cost pressures continue to increase.

Pressure than the UF is not big advantage: I myself think, because I saw a lot of magnetic core common mode cable tie separated with the middle, so not very reliable, and some pulled the middle of a certain distance, the line fixed with glue , A long time, how about reliability? If the inductance requirements are relatively large, the line will be crowded together, there is little doubt on the safety.

Installation inconvenience, a higher failure rate --- Sharing from enthusiasts: "The general performance is the same, the same diameter magnetic ring to do than the UF10.5 sense of the volume is high, easy to achieve. UF10.5 is better, a difference of about 5 DB! Magnetic ring if the picture is relatively cheap as age, but not good plug-ins, the fault is relatively large. If added a base is not cheap, more expensive than the UF10.5 "

application:

Because of cost factors, the magnetic ring is mostly used in high-power power supply, enthusiasts describe: "low-power magnetic ring is too high," is justified.

Of course, because of its small size, the volume of the low-power power requirements, the use of magnetic ring is also a very OK choice.

The overall performance is better than the UF system. If the cost of pressure is not a big project, you can consider the use of magnetic ring. My actual test reached, with a lower margin of the magnetic ring more. And the feeling is still smaller than the UF.

Say UF / UU series of common mode!

Material: basically ferrite, of course, this ferrite is also different, there are generally MXO-manganese zinc and NXO-nickel zinc. The main advantages of nickel-zinc are: low initial permeability (less than 1000u), but can work at relatively high frequencies (greater than 100MHZ), to maintain the same permeability. Very strong and great.

NXO resistivity than MXO high. The use of ferrite to dampen high frequency clutter frees high-frequency noise as thermal energy, which explains the temperature issues with common mode inductors.

Common Mode Inductance: The two coils are wound on the same core with the same number of turns and phases (wound in the opposite direction). In this way, when the normal current in the circuit flows through the common-mode inductor, the current reverses the magnetic field in the inductors with the same phase and cancels each other. At this time, the normal signal current is mainly affected by the coil resistance Sense caused by the damping); when the coil current flow through the common-mode interference, the coil will be generated in the same direction of the magnetic field and increase the inductance of the coil, the coil showed high impedance, resulting in a strong damping effect to This attenuation of common-mode current, to achieve the purpose of filtering.

Overall advantage:

The most important point: low cost can be used around the machine, efficient, commonly used UU9.8 or UU10.5;

A skeleton, winding process should be better control, you can do a higher amount of inductance;

Pressure and reliability is better? Common mode for the magnetic ring;

Good plug-in, good installation. Four feet, no problem alignment holes; the basic use of small current power supply, because the diameter can not be used very thick, so the current can not be too large;

Overall disadvantage:

Space factors: packaging location, large size, unlike the magnetic ring so small and exquisite;

Fever is more serious, but also based on my measured: 90V input full load at room temperature, can be up to 90 degrees;

application:

Generally used in more stringent cost control, or low-power situations;