US 6,211,767 B1 · High power planar transformer

Abstract

A Low-to-High-Power, high reliability, high efficiency, small size transformer for power supply/DC—DC converter applications, using an inner layer winding constructed in a multilayers PCB and perfectly insulated with respect to the secondary, each layer having one ore more loops, interconnected to other layer by vias and contacted with simple pads, or any other contact type, including special connectors inserted in the PCB. The secondary is a special cooper strip designed as one or more one-turn strip, with pins designed for mechanical attachment and electrical contact. All the secondary strips on one side of the PCB, are perfectly symmetrical to the ones on the other side, so that they are interchangeable, and can be mounted on either side of the PCB. The secondary may be contacted directly to the strips, or with any other type of power connector inserted in the PCB. The magnetics are either E+I type, or I type, and the PCB has dedicated rectangular slots to accommodate the magnetics, and also special metalized holes to receive the secondary pins.

Claims23

Dependent claims

A transformer, comprising:

a) a multilayer board, having multiple layers of dielectric sheets;
b) a first transformer core extending through said layers of dielectric sheets;
c) a first set of electrically conductive buried windings, each of said buried windings encircling said first transformer core, and, each of said buried windings contained between two adjoining layers of said dielectric sheets;
d) at least one copper strip encircling the said magnetic core secured to a first surface of said multilayer board over said buried winding;
wherein said copper strip has bent pins for accurate positioning on said multilayer board.

2 more elements

A magnetic structure, comprising:

a) a first multilayer board, having multiple layers of dielectric sheets;
b) at least a second multilayer board, having multiple layers of dielectric sheets;
c) a first transformer core extending through said layers of dielectric sheets of said first multilayers board and said second multilayer board;
d) a first set of electrically conductive buried windings, each of said buried windings of said first multilayer board encircling said first transformer core, and, each of said buried windings contained between two adjoining layers of said dielectric sheets;
e) a second set of electrically conductive buried windings, each of said buried windings of said first multilayer board encircling said first transformer core, and, each of said buried windings contained between two adjoining layers of said dielectric sheets;
f) a least a copper strip encircling said magnetic core secured to first surface of said second multilayer board over said buried winding;
wherein said copper strip has a first set of bent pins to accurate positioning on said second multilayer board and a second set of bent pins to accurate positioning on said first multilayer board.

4 more elements

Dependencies are inferred from the claim text.

High power planar transformer

Life of this patent

High power planar transformer

Life of this patent

Abstract

Claims23