Magnetic structures for low leakage inductance and very high efficiency

Abstract

A magentic configuration using a plurality of posts and spiting the primary winding on each of the posts and placing the secondary windings together with the rectifiers menas around each posts to minimise the stray and leakage inductance. In this magentic configurations there is a significant reduction of the core material and a reduction of the footprint by a better utilization of the copper. The magentic field is weaving from through a post to the other minimizing the vertical components and forcing the magentic field to be paralel with the winding reducing the ac copper losses. These properties allows this magentic strcuture to be suitable in very high frequency applications and even in application with air core. These magentic structures can be used for transformer inplementation and also for the inductive applications.

Description

RELATED APPLICATION / CLAIM OF PRIORITY[0001]This application is related to and claims priority from Provisional application Ser. No. 61955640, filed Mar. 19, 2014, which provisional application is incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates mechanical construction and its mechanical results for transformer and inductances with utilization in power conversion, data transition and communication.BACKGROUND OF THE INVENTION[0003]There is an industry demand for smaller size and lower profile power converters, which require smaller and lower profile magnetic elements, such as transformer and inductors. For a better consistency in production for magnetic elements, the windings are embedded into the multilayers PCB structures. In such applications, the copper thickness is limited. To be able to use thinner copper and limited numbers of layers for higher current applications, there are several solutions. One solution is to split the currents and ...

AI Technical Summary

Benefits of technology

The invention describes magnetic structures that offer improved magnetic core configuration and winding arrangement. These magnetic structures have a lower leakage inductance, better utilization of copper, a smaller footprint, and are suitable for very high frequency operation. The embodiments of this invention can be used for transformer application or inductive elements. The patent describes the design of a four-legged magnetic structure that merges four E type magnetic cores, resulting in a reduction of total footprint and core loss. Another embodiment is presented in which the output connectors are placed to increase the utilization of copper and decrease the total footprint of the transformer and output choke. These magnetic structures offer a solution for high output current applications.

Problems solved by technology

In such applications, the copper thickness is limited.

The prior art magnetic structures depicted in FIG. 1 can provide some reduction of the leakage inductance but they cannot offer a significant reduction of the total footprint to allow a reduction of the stray inductance.

Function of the winding configuration such a structure can benefit of a lower leakage inductance but it does not address the parasitic inductance, which is caused by the interconnection from the transformer to the power semiconductor devices.

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