The word inductor is an inductor similar to the Chinese character "work". It is generally a kind of plug-in inductor. The coil is wound on the I-core core according to actual needs. At the same time, two pins are drawn and the sleeve is set with a heat shrink sleeve. Tube, this makes the I-shaped inductor, the general coil winding different manufacturers will have different winding methods, because the word inductor can have a large volume and the core selection diversity, so the rated current and inductance value can be improved To the required value. Therefore, the word inductor has the characteristics of high power, high saturation, low impedance, high Q value, and automatic plug-in. We will find that the larger I-shaped inductors are mostly used in power supply applications, not signal processing.

   We will find that the larger I-shaped inductors are mostly used in power supply applications, not signal processing.

First, the meaning of the word inductance

   1, I-shaped inductor

   Its predecessor is a flex-type chip inductor, and the I-shaped inductor is an improvement. The baffle effectively enhances the energy storage capacity, changes the EMI direction and size, and reduces the RDC. It can also be said to be a compromise between signal communication inductance and POWER inductance.

SMD type I-shaped inductors are mainly used for small power supply switching from several hundred kHz to one or two MHz, such as digital camera LED boost, ADSL, etc. for lower frequency part of signal processing or POWER use, it The Q value is 20,30, which is quite suitable for signal processing; RDC is lower than the flex-type chip inductor, and it is very easy to use as POWER. Of course, a large I-shaped inductor is definitely used for POWER. .

  The shortcoming of the I-shaped inductor is still the open magnetic circuit, which has the problem of EMI. In addition, the noise problem is larger than the flex-type chip inductor. I personally think that the I-shaped inductor is definitely not a refined structure, and the improvement space is still very large!

Second, the main parameters of the word inductor

  1. Inductance: The inductance L is the inherent characteristic of the inductor itself. It is directly related to the nominal relationship of voltage and current. The inductance is the important parameter of the inductor.

  2, the inductive reactance: the capacitance corresponds to the capacitive reactance, the inductance corresponds to the inductive reactance, which is the size of the coil to the alternating current, the inductive reactance value XL = 2πfL;

  3, Q value: the Q value of the inductor is a physical quantity of the coil, the higher the Q value, the smaller the loop loss, the Q value is generally tens to hundreds, its value Q = ωL / R;

  4. Rated current: The current allowed in the coil. When designing the circuit, the current limit should be fully considered, especially in high frequency chokes.

  What items need to be tested for I-shaped inductors? Southern Electric Inductance Engineer provides you with the knowledge of inductance every day!