What are the common inductors

 

Custom inductor manufacturer tells you

SMD INDUCTOR

Like resistors and capacitors, inductors are one of the most generally used unresistant bias in circuit design. Inductor is an energy storehouse element, which can convert electric energy and glamorous energy into each other, and substantially plays a part in filtering, oscillating, stabilizing current and restraining electromagnetic hindrance in the circuit. When inductors are used in this circuit, you have to know these parameters of inductors!

When you look at some circuit schematics, you'll find that inductance symbols are used in the circuit. After looking at the parameters on the symbol, I came indeed more confused. When did the unit of inductor come OHM? In fact, this isn't an inductor, but a glamorous blob. Next, we will add some knowledge about the difference and connection between inductors and glamorous globules.

First explain the function of glamorous globules in the circuit, the topmost part of series glamorous globules in the signal transmission line is to suppress the hindrance signal, from the principle point of view, the glamorous globules can be original to an inductor, note that this is a simple inductor. The real inductor coil has distributed capacitance, that is, the inductor we use is original to an inductor connected in resemblant with a distributed capacitor.

Overview of Inductance

Theoretically, to suppress the conducted hindrance signal, it's needed that the larger the quantum of inductance, the better, but for the  inductor coil, the lesser the inductance, the lesser the distributed capacitance of the inductor coil, and the goods of the two will cancel each other out.

At the morning, the impedance of the inductor coil increases with the increase of frequence, but when its impedance increases to the outside, the impedance decreases fleetly with the increase of frequence, which is due to the effect of resemblant distributed capacitance. When the impedance increases to the outside, it's the place where the distributed capacitance of the inductor coil resonates with the original inductor in parallel. The larger the inductance of the inductor coil is, the lower the reverberative frequenceis.However, also the final choice of the inductor coil will have to be its minimal limit, the glamorous blob, If we want to further ameliorate the repression frequence. Still, the distributed capacitance of the through- core inductor is several times to dozens of times lower than that of the single- circle inductor coil, so the working frequence of the through- heart inductor is advanced than that of the single- circle inductor coil. The inductance of glamorous globules is generally fairly small, about between a many microbeads and dozens of microbeads. Another use of glamorous globules is to do electromagnetic shielding, its electromagnetic shielding effect is better than the shielding effect of shielding line, which utmost people don't pay important attention to. The system of use is to let a brace of cables pass through the middle of the glamorous globules, so when there's an electric current flowing out of the double cables, utmost of the glamorous field will be concentrated in the glamorous globules, and the glamorous field will no longer radiate outward. Because the glamorous field produces eddy current in the glamorous blob, the direction of the eddy current producing the power line is just contrary to that of the power line on the face of the captain, which can offset each other. Thus, the glamorous blob also has a shielding effect on the electric field, that is, the glamorous blob has a strong shielding effect on the electromagnetic field in the captain.

The advantage of using glamorous globules for electromagnetic shielding is that the glamorous globules don't need to be predicated, and the trouble of grounding needed by the shielding line can be avoided. Using glamorous globules as electromagnetic shielding, for double cables, it's original to connecting a common-mode repression inductor in the line, which has a strong repression effect on common-mode hindrance signals.

It can be seen that the inductor coil is substantially used for EMI repression of low- frequence hindrance signals, while glamorous globules are substantially used for EMI repression of high- frequence hindrance signals. Thus, for EMI repression of a wide-band hindrance signal, several inductors of different parcels must be used at the same time to be effective. In addition, to suppress the common mode conducted hindrance signal by EMI, we should also pay attention to suppressing the connection position between the inductor and the Y capacitor. The Y capacitor and repression inductor should be as close as possible to the input of the power force, that is, the position of the power outlet, and the high frequence inductor should be as close as possible to the Y capacitor, while the Y capacitor should be as close as possible to the ground line connected to the earth (the ground line of the three- core power cord), which is effective for EMI repression.

The below is the preface of common inductors, if you want to know further about inductors, please feel free to communicate us.

Inductors from China