Take you to identify the packaging quality of shielded chip inductors
1. Judgment of the good and bad inductance of the shielded patch
The quality of SMD inductors can not be ignored, because now not to mention what to do, the first thing customers ask is usually how many of these products are there, and some times ignore the problem of quality.
So why analyze the *** and bad of shielded chip inductance?In today's chip inductor market, without excellent inductor quality, no matter how low it is, it will definitely make the company lose the purpose of consumption. When analyzing the quality of the chip inductor, the customer can have a greater decision when consuming, and can choose the best in it, rather than just relying on a certain **.
SMD inductors. 
The basic purpose of inductance consumption chip inductor is application, other things are not the quality of chip inductors, if the industry caters, it is recommended to be able to go to the manufacturer to carry out field investigations, if the industry can not tolerate, can refer to the evaluation of other users, each other very. It is not enough to pay attention only to product quality, but also through the after-sales system of chip inductor manufacturers.
Perfect after-sales system is a guarantee for the rights and interests of users, the company can be based on the professionalism of the salesman, and the professionalism of the after-sales personnel to carry out analysis. All in all, one is to look at the product quality, and the other is to look at the after-sales quality, these two parts can be done, so that the chip inductor manufacturers are trustworthy.
Shielded chip inductors.
Second, the advantages of shielded chip inductors:
SMD inductor is a chip electromagnetic induction element wound with insulated wire, which is a kind of commonly used inductive element. When a chip inductor passes an electric current through the circuit, a magnetic field is generated, and the magnetic flux of the magnetic field is eventually applied to the circuit. SMD inductors are generally divided into thin-film chip inductors, wire-wound chip inductors, and multilayer chip inductors. Let's analyze the types of chip inductors and their advantages and disadvantages.
1. Thin-film chip inductor: It can maintain the characteristics of high Q value, high stability, high precision and small problem solving in the microwave frequency band. The internal magnetic field distribution is concentrated, which ensures that the device parameters do not change much after placement, especially above 100MHz, showing very good frequency characteristics.
2. Wound chip inductance: the inductance range is wide, the inductance accuracy is high, the loss is small, and the allowable current is large. In particular, its production process is very inheritable, simple and low-cost. The disadvantage is that the size is limited, and the downsizing is limited. Ceramic-based wire-wound inductors maintain a stable inductance and a fairly high Q value at very high frequencies.
SMD inductors, also known as: power inductors, SMD inductors, SMT inductors, and high-current inductors. Surface-mount high-power inductors. Its inductor is an electromagnetic induction element wound with enameled wire, yarn-wrapped wire and other insulated wires, and is also one of the components commonly used in electronic circuits.
The chip inductors produced by chip inductor manufacturers are basically the same, so how to distinguish their quality, you can first use a universal meter to measure the inductance, whether the error meets the requirements, and what is the proportion of inductance?Generally, the inductance of poor quality inductance does not meet the requirements, and the error will be relatively large. When the AC voltage passes through the chip inductor, the inductive reactance of the inductance will have a certain effect on the current, similar to the resistance effect on the current, so when we analyze the circuit, we can use the inductance of the chip inductor to adjust this structure.
Common classifications of inductance coils:
1 Single-layer coil.
A single-layer coil is made of insulated wires that are wound around a paper tube or bakelite skeleton one by one. Such as transistor radio, medium wave antenna coils.
2 Hive-style coils.
If the plane of the coil wound is not parallel to the rotating plane, but intersects at a certain angle, this kind of coil is called a honeycomb coil. The number of times the wire bends back and forth after one rotation is often called the number of vertices. The advantages of the honeycomb winding method are small size, small distributed capacitance, and large inductance. The honeycomb coils are wound by the honeycomb winding machine, and the more vertices, the smaller the distributed capacitance.
3 Ferrite core and iron powder core coils.
The amount of inductance of the coil is related to the presence or absence of a magnetic core. Inserting a ferrite core into an air-core coil increases the amount of inductance and improves the quality factor of the coil.
4 copper core coils.
Copper core coils are used more in the ultra-short wave range, and the position of rotating copper core ** ring is used to change the inductance, which is more convenient and durable.
5 color-coded inductance coils.
It is a high-frequency inductance coil that is encapsulated with epoxy resin or plastic after some enameled wire is wound around the magnetic core. It operates at frequencies from 10kHz to 200MHz and has an inductance of 0Between 1uh and 3300uh. Color-coded inductors are inductors with a fixed amount of inductance, and the inductance is marked with a color ring in the same way as a resistor. Its unit is UH.
6 Chokes (chokes).
The coil that restricts the passage of alternating current is called a choke, which is divided into a high-frequency choke and a low-frequency choke.
7 Deflection coil.
The deflection coil is the load of the output stage of the TV scanning circuit, and the deflection coil requirements: high deflection sensitivity, uniform magnetic field, high Q value, small size, and low quality.