Planar inductor based on fractional turn coil structure

Abstract

The invention discloses a planar inductor based on a fractional turn coil structure. A winding of the planar inductor comprises a first coil and a second coil, and the first coil adopts an integer turn coil; the second coil is a single-layer coil and comprises n arc section wires which are not communicated and form a circle; n arc section wires in the second coil are connected in parallel and then are connected in series with the first coil, the current direction of each arc section wire in the second coil is the same as the current direction in the first coil after conduction, the current magnitude of each arc section wire in the second coil is 1 / n of the current magnitude in the first coil, and the magnetic flux generated in the second coil is 1 / n of that of one turn of coil in the first coil. The fractional-turn coil structure is obtained in a shunting mode, the inductor design precision can be improved, winding loss is reduced, the power density of the converter is improved, and errors caused by rounding in a traditional method are reduced.

Description

technical field [0001] The invention relates to the field of inductor structures for power converters, in particular to a planar inductor based on a fractional-turn coil structure. Background technique [0002] Inductor is an important part of power converter; as a magnetic component in the converter, it undertakes the functions of energy storage and filtering. With the development direction of high efficiency, high frequency, planarization, integration and high power density of power electronics technology, it is required that the magnetic components used in power electronic switching power supplies also have high frequency, integration, low loss and high power Density trends. As a kind of magnetic components, inductors have large volume and weight, so their loss ratio is relatively high. In recent years, planar magnetic components have developed rapidly. Planar inductors have the advantages of small volume and weight, low loss, small leakage inductance, good heat dissipa...

AI Technical Summary

Problems solved by technology

[0003] In the process of inductor design, the number of turns calculated by the traditional design method after selecting a certain magnetic core size is usually not an integer, and then it will be rounded; when the number of turns is large, the error of rounding is negligible; but small After rounding the number of turns of the winding, the inductance will have a greater impact on the error and will increase the loss

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