- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
English
Views: 1 Author: Site Editor Publish Time: 2024-09-23 Origin: Site
Inductance can be made by winding a conductive material around a magnetic core, such as copper wire, or by removing the magnetic core or replacing it with ferromagnetic material. Core materials with higher magnetic permeability than air can more tightly confine the magnetic field around the inductive element, thereby increasing the inductance. There are many types of inductors, most of which are made by wrapping an outer enamel coated wire around a ferrite spool, while some protective inductors completely place the coil inside the ferrite. The cores of some inductive components can be adjusted. This can change the size of the inductance. Small inductors can be directly etched onto PCB boards using a method of laying spiral tracks. Small value inductors can also be manufactured using the same process as transistors in integrated circuits. In these applications, aluminum interconnects are often used as conductive materials. Regardless of the method used, the circuit with the most practical constraint applications is still called a "rotator", which exhibits the same characteristics as an inductive element using a capacitor and active component. Inductive components used for high-frequency isolation are often composed of a metal wire that passes through a magnetic column or bead.
Small inductor
Small fixed inductors are usually made by directly winding enameled wire on the magnetic core, mainly used in circuits such as filtering, oscillation, notch, delay, etc. It has two packaging forms: sealed and unsealed, and both forms have two external structures: vertical and horizontal.
1. Vertical sealed fixed inductor adopts the same direction pins. The domestic inductance range is 0.1~2200 μ H (directly marked on the shell), the rated working current is 0.05~1.6A, and the error range is ± 5%~± 10%. The imported inductance has a larger current range and smaller error. Imported TDK series color coded inductors, whose inductance is marked on the surface of the inductor with color dots.
2. Horizontal sealed fixed inductor adopts axial pins, and there are LG1, LGA, LGX and other series domestically produced.
The inductance range of LG1 series inductors is 0.1~22000 μ H (directly marked on the housing)
The LGA series inductor adopts an ultra small structure, similar in appearance to a 1/2W color ring resistor, with an inductance range of 0.22-100 μ H (marked on the housing with a color ring) and a rated current of 0.09~0.4A.
The LGX series color coded inductors are also small package structures, with an inductance range of 0.1~10000 μ H and rated currents in four specifications: 50mA, 150mA, 300mA, and 1.6A.
Adjustable inductor
Commonly used adjustable inductors include oscillation coils for semiconductor radios and row oscillation coils for televisions
Linear coil, intermediate frequency notch coil, frequency compensation coil for audio, blocking coil, etc.
1. Semiconductor radio oscillation coil: This oscillation coil, together with variable capacitors and other components, forms a local oscillation circuit in a semiconductor radio, which is used to generate a local oscillator signal that is 465kHz higher than the radio signal received by the input tuning circuit. The exterior is a metal shielding cover, and the interior is composed of a nylon lining frame, an I-shaped magnetic core, a magnetic cap, and a pin holder. A high-strength enameled wire winding is used on the I-shaped magnetic core. The magnetic cap is mounted on a nylon frame inside the shielding cover and can rotate up and down to change the inductance of the coil by adjusting its distance from the coil. The internal structure of the intermediate frequency notch coil in a television is similar to that of an oscillating coil, except that the magnetic cap has an adjustable magnetic core.
2. Horizontal oscillation coil for television: Horizontal oscillation coil is used in early black and white televisions. It forms a self-excited oscillation circuit (three-point oscillator or intermittent oscillator, multi harmonic oscillator) with peripheral resistive capacitive elements and horizontal oscillation transistors, and is used to generate rectangular pulse voltage signals with a frequency of 15625HZ.
The center of the magnetic core of the coil has a square hole, and the row synchronization adjustment knob is directly inserted into the square hole. By rotating the row synchronization adjustment knob, the relative distance between the magnetic core and the coil can be changed, thereby changing the inductance of the coil, keeping the row oscillation frequency at 15625HZ, and generating synchronous oscillation with the row synchronization pulse sent by the automatic frequency control circuit (AFC).
3. Linear coil: Linear coil is a nonlinear magnetic saturation inductance coil (whose inductance decreases with the increase of current), which is generally connected in series in the deflection coil circuit to compensate for linear distortion of the image using its magnetic saturation characteristics.
A linear coil is made by winding enameled wire around an "I-shaped" ferrite high-frequency core or ferrite magnetic rod, and an adjustable permanent magnet is installed next to the coil. By changing the relative position between the permanent magnet and the coil, the inductance of the coil can be adjusted to achieve linear compensation.
Resistive current inductor
A current blocking inductor refers to an inductive coil used in a circuit to block the path of alternating current,
It is divided into high-frequency blocking coil and low-frequency blocking coil.
1. High frequency choke coil: High frequency choke coil, also known as high-frequency choke coil, is used to prevent high-frequency AC current from passing through.
High frequency choke coils work in high-frequency circuits and are often made of hollow or ferrite high-frequency cores. The skeleton is made of ceramic or plastic materials, and the coil is wound in honeycomb or multi-layer flat sections.
2. Low frequency choke coil: Low frequency choke coil, also known as low-frequency choke coil, is used in current circuits, audio circuits, or field output circuits to prevent low-frequency AC current from passing through.
Usually, the low-frequency choke coil used in audio circuits is called an audio choke coil, the low-frequency choke coil used in field output circuits is called a field choke coil, and the low-frequency choke coil used in current filtering circuits is called a filtering choke coil.
Low frequency blocking coils generally use "E" - shaped silicon steel sheet cores (commonly known as silicon steel sheet cores), Permalloy cores, or ferrite cores. To prevent magnetic saturation caused by large DC currents, appropriate gaps should be left in the iron core during installation
