Winding inductor of open magnetic circuit

Abstract

The invention discloses a winding inductor of an open magnetic circuit. The inductor comprises an I-shaped ferrite magnetic core consisting of an upper blade, a lower blade of which a surface is provided with two end electrodes and a magnetic core column, and a coil wound on the magnetic core column, wherein the two end electrodes are respectively connected with two ends of the coil, edges of the upper blade and the lower blade of the I-shaped ferrite magnetic core are free of supports, and resin is filled in an external skin of the coil and between the upper blade and the lower blade of the I-shaped ferrite magnetic core, and the winding inductor of the open magnetic circuit is characterized in that the resin is the non-magnetic resin with a low coefficient of heat conductivity. According to the invention, the non-magnetic resin with the low coefficient of heat conductivity is filled between the two blades of the magnetic core, the original electrical characteristics of the existing inductor are not changed, the mechanical strength performance of the inductor can be obviously strengthened, a coefficient of heat expansion of the inductor can be changed, the cold and heat impulsion resistance of the inductor can be strengthened, the damage of thermal radiation on the coil part in a manufacturing process can be stopped, and the high environmental temperature resistance can be strengthened.

Description

technical field [0001] The invention relates to an inductor, in particular to an open magnetic circuit wound inductor. Background technique [0002] The existing open magnetic circuit winding inductor manufacturing method generally includes the following steps: winding, dipping in tin, testing and packaging. Among them, according to the inductance and the size of the maximum DC operating current, the enameled wire with the corresponding diameter is selected to be wound on the soft ferrite core. Soft ferrite cores are poorer in mechanical strength than other metal materials, especially when applied to thin inductors. The word is PCB), above, often due to the poor mechanical strength of the magnetic core, the inductor is damaged and the probability of cracking is high, resulting in the variation of the electrical performance of the inductor, which is difficult to meet the development needs of miniaturization and thinning of the inductor. [0003] A surface-mounted coil discl...

AI Technical Summary

Problems solved by technology

Soft ferrite cores are poorer in mechanical strength than other metal materials, especially when applied to thin inductors. The word is PCB), above, often due to the poor mechanical strength of the magnetic core, the inductance is damaged and the probability of cracking is high, resulting in the variation of the electrical performance of the inductance, which is difficult to meet the development needs of miniaturization and thinning of the inductance.

[0003] A surface-mounted coil disclosed in Chinese patent CN 1230756A has no supports on the edges of the two blades of the drum-shaped magnetic core. The mechanical force ability is significantly reduced, and the device is more susceptible to damage or cracks caused by external force, resulting in variation in the electrical performance of the inductor

In addition, the resistivity of the manganese zinc ferrite is less than 100 ohm m, which is a good conductor, which will significantly reduce the insulation performance between the coils and increase the risk of short circuit in the inductor

[0005] As for a wire-wound electronic component disclosed in Chinese patent CN 1210345A, the filler in the resin is mixed with one or two powders of inorganic materials or metal materials and ferrite powder for magnetic shielding. The inorganic materials have high thermal conductivity Material, in processing and actual use, external heat is easily transferred to the internal coil through conduction, causing the temperature of the internal coil to rise sharply with the ambient temperature, and there is a greater risk of short circuit, and the addition of metal materials that are good conductors also exists risk of short circuit

In addition, adding ferrite powder, in its manufacturing process, its electrical characteristics will have obvious deviations due to the amount of magnetic powder

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