The basic structure of chip power inductors

SMD power inductor is one of the commonly used components in electronic circuits. Inductance is a series of coaxial turns made by enameled wire, yarn-covered wire or plastic wire on an insulating skeleton or magnetic core or iron core. It is represented by the letter "L" in the circuit, and its main function is to communicate with each other. The signal is isolated, filtered or combined with capacitors, resistors, etc. to form a resonant circuit. Inductance is generally composed of a skeleton, windings, shields, packaging materials, magnetic cores or iron cores.

1. Skeleton The skeleton generally refers to the bracket on which the coil is wound. Some large fixed or adjustable inductors (such as oscillating coils, choke coils, etc.), most of which are enameled wires (or yarn-covered wires) around the skeleton, and then magnetic cores, copper cores, iron cores, etc. The inner cavity of the skeleton to increase its inductance.

2. Winding Winding refers to a set of coils with prescribed functions, and it is the basic component of inductance. There are single-layer and multi-layer windings. There are two types of single-layer windings: close winding (the wires are wound next to each other) and indirect winding (the wires are separated by a certain distance when winding); the multilayer winding has layered flat winding and random winding. Winding, honeycomb winding and many other methods.

3. Magnetic cores and magnetic rods Magnetic cores and magnetic rods are generally made of nickel-zinc ferrite (NX series) or manganese-zinc ferrite (MX series) and other materials. It has "I" shape, cylindrical shape, cap shape, "E" shape, Various shapes such as can

4. The core material mainly includes silicon steel sheet, permalloy, etc., and its shape is mostly "E" type.

5. In order to prevent the magnetic field generated by some inductors from affecting the normal operation of other circuits and components, a metal screen cover (such as the oscillation coil of a semiconductor radio, etc.) is added to the shield. Using the inductance of the shield will increase the loss of the coil. Choosing an inductor should choose a bussmann patch power inductor, a big brand, and good quality. (Shanghai Huapai Electronics)