High power density low-loss EV type inductor

Abstract

The invention discloses a high power density low-loss EV type inductor and aims to provide an inductor that has small height, small volume, large unit power density, low loss, high reliability, good saturability and higher utilization rate of the cubical space of a whole transformer. The high density low-loss inductor consists of a magnetic core (1) which is formed by the butt joint and adhesion of two horizontally arranged EV type magnetic cores, a framework (2) and a coil winding. The coil winding is wound on the framework (2). The magnetic core (1) is adhered to the framework (2) as a wholeby glue. A pin I (3) and a pin II (4) arranged on the framework (2) are respectively arranged on two end faces of the framework (2). By reasonable design of the height of the magnetic core and the sectional area of a central column, the EV type inductor achieves reasonable matching with the coil, makes full use of area of magnetic flux and greatly improves the power density of unit volume.

Description

technical field [0001] The invention relates to an EV-type inductor with high power density and low loss, which is applied to power factor correction and harmonic filter circuits of various electronic equipment. Background technique [0002] The increasingly wide application of power electronic devices has made the problem of harmonic pollution more and more serious. In order to make the input current harmonics of switching power supplies or electronic ballasts used in electronic devices meet the requirements, a power factor correction (PFC) circuit must be added, and The PFC inductor used therein is an energy storage element with a sufficiently large inductance. [0003] In the switching power supply of various electronic equipment, the output inductance used for switching power supply with output DC (direct current) mainly plays the role of smooth choke and energy storage. It is usually connected in series with the load and must have the ability to withstand large currents...

AI Technical Summary

Problems solved by technology

[0004] At present, the most commonly used method is to make this inductor with a power ferrite core and an air gap. In the prior art, most of the above inductors are made of conventional E-shaped or ring-shaped magnetic cores, which generally have high height and large volume. The unit power cost is high, the cross-sectional area of ​​the magnetic core is not utilized enough, the saturation is poor, the consumption of copper wires is large, the loss is large, and the three-dimensional space utilization rate of the entire transformer is low. This also requires engineers to design small volume, high power density, high The problems faced by efficient inductors

[0005] In addition, due to the limitations of packaging or circuit design in some existing inductors, the output and input ends of the inductor are required to be arranged on both sides of the same end face on the skeleton (vertical skeleton). After adopting this structure, the Coil windings often produce half-turns, resulting in large input and output voltage allocation errors; in addition, due to the height limitation of this type of skeleton, it is difficult to realize the structure of multiple winding slots, and the resonant winding is easy to produce interlayer in the working state. The phenomenon of short circuit, these are the defects that exist in the prior art

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