Printed circuit board with integrated inductor

• US 20070001796A1
• Filed: 08/24/2004
• Published: 01/04/2007
• Est. Priority Date: 08/26/2003
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Ackermann, Bernd, Waffenschmidt, Eberhardt, Derckx, Henricus, Lier, Wilheimus
• Application Number:
  US10/569,216
• Publication Number:
  US 20070001796A1
• Time in Patent Office: Days
• US Class Current: 336/223
• CPC Class Codes: H01F 2017/0066 with a magnetic layer
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• CPC Class Codes: H05K 1/165 incorporating printed inductors
• CPC Class Codes: H05K 2201/086 for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2203/1572 Processing both sides of a PCB by the same process; Providing a similar arrangement of components on both sides; Making interlayer connections from two sides
• CPC Class Codes: H05K 3/305 Affixing by adhesive

Abstract

Printed Circuit Board with Integrated Inductor. In today'"'"'s electronic devices components such as inductors are required having a small building height. According to the present invention, a core of an inductor may be realized by ferrite plates glued onto a substrate. A winding of the inductor is provided in the substrate. Advantageously, this may allow to provide an inductor having a simple arrangement and a reduced building height.

Claims

1. Printed circuit board with an inductor, comprising:

a substrate, wherein the substrate has a first side and a second side;

an inductor core; and

a first winding;

wherein the first winding is provided in the substrate;

wherein the inductor core comprises a first softmagnetic layer and a second softmagnetic layer;

wherein the first softmagnetic layer is provided on the first side of the substrate and the second softmagnetic layer is provided on the second side of the substrate.

2. The printed circuit board of claim 1,

wherein the substrate comprises an electrically conductive layer;

wherein a wiring is provided; and

wherein the first winding and the wiring are provided in the electrically conductive layer.

3. The printed circuit board of claim 2,

wherein a shorted turn is defined in the electrically conductive layer, which shorted turn surrounds the winding and acts as a portion of a magnetic shield, which shield further includes an electrically conductive layer on top of the first softmagnetic layer.

4. The printed circuit board of claim 1,

wherein the first and second softmagnetic layers are plates of sintered ferrite.

5. The printed circuit board of claim 4,

wherein the substrate is a flex foil;

and

wherein the plates of sintered ferrite are glued to the flex foil.

6. The printed circuit board of claim 1,

wherein the substrate is provided with a through-hole, in which through-hole an electrical connection to an inner end of the first winding is provided and in which through-hole a magnetic bridge between the first and the second softmagnetic layer is provided.

7. The printed circuit board of claim 6, wherein the magnetic bridge comprises a polymer material filled with magnetic particles, which filled polymer material extends at the first and the second side of the substrate as an adhesive between the first and the second softmagnetic layers and the substrate.

8. The printed circuit board of claim 1,

wherein the substrate includes a first layer and a second layer;

wherein the first winding comprises a second winding and a third winding

wherein the second winding is provided on the first layer and the third winding is provided on the second layer such that the second and third windings are provided in the substrate.

9. The printed circuit board of claim 1,

wherein a distance between the first softmagnetic layer and the second softmagnetic layer is selected such that it can be considered as an air gap in a magnetic path of a magnetic flux occurring between the first and second softmagnetic layers during operation of the inductor.

10. Inductor, comprising:

a substrate, wherein the substrate has a first side and a second side;

an inductor core; and

a first winding;

wherein the first winding is provided in the substrate;

wherein the inductor core comprises a first softmagnetic layer and a second softmagnetic layer;

wherein the first softmagnetic layer is provided on the first side of the substrate and the second softmagnetic layer is provided on the second side of the substrate.

11. A method of manufacturing an inductor, the method comprising the steps of:

providing a substrate, wherein the substrate has a first side and a second side;

providing a winding in the substrate; and

providing a first softmagnetic layer on the first side of the substrate and a second softmagnetic layer on the second side of the substrate;

wherein the first and second softmagnetic layers form an inductor core of the inductor.

12. The method of claim 11, further comprising the step of:

providing a wiring such that the wiring and the winding are provided in one conductive layer of the substrate.

13. The method of claim 11,

wherein the first and second softmagnetic layers are plates of sintered ferrite.

14. The method of claim 11,

wherein the substrate is one of a printed circuit board and flex foil;

and

wherein the plates of sintered ferrite are glued to the printed circuit board.