Planar transformer having integrated ring core

Patent metadata

Field	Value
Publication number	US-11443887-B2
Application number	US-201716341029-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Oct 10, 2016
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

A planar, in particular intrinsically safe transformer, having: a sandwich-type layer structure having a plurality of layers extending horizontally and arranged vertically on top of one another, including a first and a second conductive layer and at least one insulating inner layer disposed between the two conductive layers, a plurality of electrical circuits, wherein a first electrical circuit and at least a second electrical circuit are galvanically isolated from each other; and at least one ring-type magnetic core having a hole, which acts at least on the first electrical circuit and the second electrical circuit. The core is arranged within the at least one insulating inner layer, a conductor of the first electrical circuit and a conductor of the second electrical circuit each have a winding with at least one winding turn, and the at least one winding turn of the first electrical circuit and the at least one winding turn of the second electrical circuit each run along the first conductive layer and along the second conductive layer and through the at least one insulating inner layer and through the hole of the core.

First claim

The invention claimed is:

1. A planar, intrinsically safe transformer having a vertical dimension and a horizontal dimension, comprising:
a sandwich-type layer structure including a plurality of layers extending horizontally and arranged vertically on top of one another, comprising a first and a second conductive layer and at least one insulating inner layer disposed between the two conductive layers;
a plurality of electrical circuits, wherein a first electrical circuit and at least a second electrical circuit are galvanically isolated from each other; and
at least one ring-type magnetic core having a hole, which acts at least on the first electrical circuit and on the second electrical circuit, wherein the core is arranged within the at least one insulating inner layer;
a conductor of the first electrical circuit and a conductor of the second electrical circuit each have a winding with at least one winding turn, wherein the at least one winding turn of the first electrical circuit and the at least one winding turn of the second electrical circuit each extends along the first conductive layer and along the second conductive layer and through the at least one insulating inner layer and through the hole of the core; and
an insulation provided around the magnetic core enclosing the magnetic core in all spatial directions, wherein the insulation is formed by the insulating inner layer and has a thickness, which guarantees a second isolation distance between the core and all other electrically conductive structures of the electric circuits and which is equal to or greater than half a first minimum isolation distance, wherein the first minimum isolation distance is defined as a minimum separation distance between the first electrical circuit and the second electrical circuit.

2. The transformer as claimed in claim 1 , wherein:
at least one first conductive track for the first electrical circuit and at least one second conductive track for the second electrical circuit are defined by each of the first conductive layer and the second conductive layer; and
the at least one winding turn of the first electrical circuit comprises the first conductive track of the first conductive layer and the first conductive track of the second conductive layer, which are interconnected at one of their free end portions through a conductive via extending through the at least one insulating inner layer; and
the at least one winding turn of the second electrical circuit comprises the second conductive track of the first conductive layer and the second conductive track of the second conductive layer, which are interconnected at one of their free end portions through a conductive via extending through the at least one insulating inner layer.

3. The transformer as claimed in claim 1 , wherein at least one of the first electrical circuit and the second electrical circuit comprises a plurality of winding turns, and wherein the plurality of winding turns of an electrical circuit are interconnected such that a conductive track of the one winding turn is connected to a conductive track of the further winding turn at one of their free conductive track end portions through a conductive via extending through the at least one insulating inner layer.

4. The transformer as claimed in claim 3 , wherein the first electrical circuit and the at least second electrical circuit have a first isolation distance to each other, and wherein the first isolation distance between the electrical circuits at least corresponds to the first minimum isolation distance at any geometric location of the transformer.

5. The transformer as claimed in claim 1 , wherein at least one of the first conductive layer and the second conductive layer is an outer layer of the sandwich-type layer structure; and wherein each conductor of the first electrical circuit extending along an outer conductive layer has a third isolation distance to each conductor of the at least second electrical circuit extending along the same outer conductive layer; and wherein the third isolation distance between the electrical circuits corresponds at least to a second minimum isolation distance at any geometric location of the respective outer conductive layer of the transformer.

6. The transformer as claimed in claim 1 , wherein the sandwich-type layer structure comprises at least one insulating outer layer; and wherein at least one of the first conductive layer and the second conductive layer are disposed between an insulating inner layer and an insulating outer layer.

7. The transformer as claimed in claim 6 , further comprising a conductive layer disposed between two insulating layers so that the conductive layer comprises an inner conductive layer of the sandwich-type layer structure, each conductor of the first electrical circuit extending along an inner conductive layer has a first isolation distance to each conductor of the at least second electrical circuit extending along the same inner conductive layer; and wherein the first isolation distance between the electrical circuits corresponds at least to the first minimum isolation distance at any geometric location of the respective inner conductive layer of the transformer.

8. The transformer as claimed in claim 1 , wherein the at least one insulating inner layer has a ring-type recess in which the ring-type magnetic core is embedded.

9. The transformer as claimed in claim 1 , wherein at least two insulating inner layers are arranged on top of one another and joined to each other, in particular pressed together.

Assignees

• Phoenix Contact Gmbh & Co

Inventors

• Scholz Peter

Classifications

• H01F2019/085

  Transformer for galvanic isolation · CPC title

• H01F27/2804 Primary

  Printed windings · CPC title

• H01F19/08

  Transformers having magnetic bias, e.g. for handling pulses · CPC title

• H01F27/2895

  Windings disposed upon ring cores · CPC title