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Separated power inductor based on a lead frame

A technology of lead frame and power inductance, which is applied in the direction of inductance with magnetic core, inductance/transformer/magnet manufacturing, transformer/inductor coil/winding/connection, etc. It can solve the problems of complex structure and inconvenient manufacturing, and achieve Small footprint, simple production, thin profile effect

Active Publication Date: 2012-01-04
ALPHA & OMEGA SEMICON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These non-wound discrete inductors require multiple layers and have complex structures that are inconvenient to manufacture

Method used

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  • Separated power inductor based on a lead frame
  • Separated power inductor based on a lead frame
  • Separated power inductor based on a lead frame

Examples

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Embodiment Construction

[0060] The present invention will now be described in detail in conjunction with the accompanying drawings, which are used as examples of the present invention so that those skilled in the art can implement the present invention. It should be noted that the following figures and examples are not meant to limit the scope of the present invention. Some of the components of the present invention may be realized in part or in whole by known elements, and among these known elements, only those parts necessary for understanding the present invention will be set forth, and the detailed description of the remaining known elements will be are omitted so as not to obscure the content of the present invention. Additionally, the present invention encompasses, by way of illustration, present and future known equivalents to those referred to herein.

[0061] The invention provides a discrete power inductor based on a lead frame. Embodiments of the invention include a magnetic core having ...

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Abstract

The invention relates to separated power inductor based on a lead frame, which comprises a top lead frame and a bottom lead frame; a coil is formed by the lead feet, which encircles a single closed-loop magnetic core. The coil comprises internal connection of the internal part between the top and the bottom lead frames and an exterior connection section, and the magnetic core clipped between the top and the bottom lead frames. A plurality of the lead feet of the top and the bottom lead frames are provided with non-linear step structure to ensure that the lead feet of the top lead frame can becoupled with lead feet of the adjacent bottom lead frame and encircled the magnetic core to form the coil. The advantage of the separated power inductor based on a lead frame lies in that a compact power inductor is provided which has a maximized inductor coefficient in a unit area. The power inductor of the invention also provides power inductor combining small physical size and minimum turn number, which is provided with relatively small covering surface and thin outline. Besides, the power inductor of the invention can be produced with low cost and high yield simply through current semi-conductor encapsulation technology.

Description

technical field [0001] The present invention relates generally to discrete inductors, and more particularly to discrete inductors having top and bottom lead frames, the internal connection pins of which form a coil around a closed-loop magnetic core. Background technique [0002] A review of the prior art discrete inductors has demonstrated a variety of configurations, including packaged wire wound inductors with either circular or planar windings around a magnetic core. Typical cores are toroidal cores, "I" barrel cores, "T" barrel cores, and "E" barrel cores. Other known structures include wire wound with iron powder cores and metal alloy dust cores. It is also known to form a surface mount discrete inductor provided with windings around the magnetic core. Fabrication of wirewound inductors is an inefficient and complicated step. The open bobbin is especially used to facilitate winding around the cylindrical core. In the case of toroidal cores, the windings must be pas...

Claims

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Application Information

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IPC IPC(8): H01F41/00H01F17/04H01F27/29H01F27/28
CPCH01L2924/0002
Inventor 弗兰茨娃·赫尔伯特冯涛张晓天鲁军
Owner ALPHA & OMEGA SEMICON LTD
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