Circuit board and power conversion apparatus having circuit board

Patent metadata

Field	Value
Publication number	US-9484142-B2
Application number	US-201615046656-A
Country	US
Kind code	B2
Filing date	Feb 18, 2016
Priority date	May 21, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

The present invention discloses a circuit board, including a substrate and a magnetic core, where the magnetic core is embedded into the substrate, at least one turn of a winding conductor wound around the magnetic core is arranged on the substrate, each turn of the winding conductor includes a first end-surface conductor and a second end-surface conductor that are separately arranged on two ends of the magnetic core, and each turn of the winding conductor further includes a first side-surface conductor that penetrates through the magnetic core from an inner side of the magnetic core and a second side-surface conductor that penetrates through the magnetic core from an outer side of the magnetic core. The circuit board and the power conversion apparatus having the circuit board provided by the present invention, achieve larger inductance, save materials, and reduce cost for fabricating a power conversion apparatus.

First claim

What is claimed is:

1. A circuit board, comprising:
a substrate and a magnetic core, wherein the magnetic core is in an annular shape and the magnetic core has an inner side and an outer side, wherein the magnetic core is embedded into the substrate, at least one turn of a winding conductor wound around the magnetic core is arranged on the substrate, each turn of the winding conductor comprises a first end-surface conductor and a second end-surface conductor that are separately arranged on two ends of the magnetic core, and each turn of the winding conductor further comprises a first side-surface conductor that penetrates through the inner side of the magnetic core and a second side-surface conductor that is arranged on the outer side of the magnetic core, wherein the first side-surface conductor is electrically connected to the first end-surface conductor and the second end-surface conductor, and the second side-surface conductor is electrically connected to the second end-surface conductor, wherein the second side-surface conductor is disposed on the surface of the lateral side of the substrate.

2. The circuit board according to claim 1 , wherein the first end-surface conductor is arranged on one end surface of the substrate, and the second end-surface conductor is arranged on the other end surface of the substrate.

3. The circuit board according to claim 1 , wherein:
a first via hole is arranged on the substrate and located on the inner side of the magnetic core, and the first side-surface conductor is a conductor filled in the first via hole; or
a first plated-through hole that penetrates through and arranged on the inner side of the magnetic core is arranged on the substrate, and the first side-surface conductor is a conductor that is plated on an inner side wall of the first plated-through hole.

4. The circuit board according to claim 1 , wherein:
a second via hole is arranged on the substrate and located on the outer side of the magnetic core, and the second side-surface conductor is a conductor filled in the second via hole; or
a second plated-through hole is arranged on the substrate, wherein the second plated-through hole is located on the outer side of the magnetic core, and the second side-surface conductor is a conductor that is plated on an inner side wall of the second plated-through hole.

5. The circuit board according to claim 1 , wherein the second side-surface conductor is a conductor plated on a side wall of the substrate.

6. The circuit board according to claim 1 , wherein the magnetic core is vertically or horizontally embedded into the substrate.

7. The circuit board according to claim 1 , wherein the magnetic core has an annular shape, a polygonal annular shape, a combined shape of a “U” shape and an “I” shape, a combined shape of an “E” shape and an “I” shape, or a combined shape of an “E” shape and another “E” shape.

8. The circuit board according to claim 1 , wherein:
the magnetic core has a polygonal annular shape and a plurality of head-tail connected edges; and
the winding conductor has at least two turns, wherein at least one turn of the winding conductor is wound around one edge of the magnetic core and at least the other one turn of the winding conductor is wound around another edge of the magnetic core, or all the winding conductor is wound around a same edge of the magnetic core.

9. The circuit board according to claim 1 , wherein:
top and bottom ends of the substrate are end surfaces, wherein the end surfaces comprise a front surface and a rear surface that are oppositely arranged, and an outer peripheral wall of the substrate is a side surface of the substrate;
an area formed by projection of the magnetic core on the front surface or rear surface of the substrate is an area in which the magnetic core is located;
the first end-surface conductor is arranged on the front surface of the substrate, and the second end-surface conductor is arranged on the rear surface of the substrate;
the winding conductor has at least two turns, and the winding conductor comprises a first turn of the winding conductor and a second turn of the winding conductor, a first electronic component is arranged on the front surface of the substrate, and the magnetic core is horizontally arranged, wherein the first electronic component is located outside the area in which the magnetic core is located; and
the first end-surface conductor of the first turn of the winding conductor is connected to the first electronic component and extends to the area in which the magnetic core is located, the first side-surface conductor of the first turn of the winding conductor is a first conductive via hole, the first end-surface conductor of the first turn of the winding conductor is electrically conductive to a metal layer on the rear surface of the substrate through the first conductive via hole, the second end-surface conductor of the first turn of the winding conductor is connected to the first side-surface conductor of the first turn of the winding conductor, extends to the side surface of the substrate, and is connected to the second side-surface conductor, and the second side-surface conductor of the first turn of the winding conductor is arranged on the side surface of the substrate and connected to the second end-surface conductor of the second turn of the winding conductor; the first end-surface conductor of the second turn of the winding conductor is connected to the second side-surface conductor of the first turn of the winding conductor and extends to the area in which the magnetic core is located, the first side-surface conductor of the second turn of the winding conductor is a second conductive via hole, the first end-surface conductor of the second turn of the winding conductor is electrically conductive to the metal layer on the rear surface of the substrate through the second conductive via hole, the second end-surface conductor of the second turn of the winding conductor is connected to the first side-surface conductor of the second turn of the winding conductor and extends to the side surface of the substrate, and the second side-surface conductor of the second turn of the winding conductor is arranged on the side surface of the substrate and connected to the second end-surface conductor of the first turn of the winding conductor.

10. The circuit board according to claim 1 , wherein:
top and bottom ends of the substrate are end surfaces, wherein the end surfaces comprise a front surface and a rear surface that are oppositely arranged, and an outer peripheral wall of the substrate is a side surface of the substrate;
an area foamed by projection of the magnetic core on the front surface or rear surface of the substrate is an area in which the magnetic core is located;
the first end-surface conductor is arranged on the front surface of the substrate, and the second end-surface conductor is arranged on the rear surface of the substrate;
the winding conductor has at least two turns, comprising a first turn of the winding conductor and a second turn of the winding conductor, a first electronic component is arranged on the front surface of the substrate, and the magnetic core is horizontally arranged, wherein the first electronic component is located outside the area in which the magnetic core is located;
a plated-through hole penetrating through the substrate is arranged within the area in which the magnetic core is located;
the first end-surface conductor of the first turn of the winding conductor is connected to the first electronic component, extends to a side wall of the plated-through hole, and is connected to the first side-surface conductor of the first turn of the winding conductor, the first side-s

Assignees

• Huawei Tech Co Ltd

Inventors

• Guo Quan
• Zhu Yongfa
• Han Chengzhang

Classifications

• H01F27/2804 Primary

  Printed windings · CPC title

• H05K1/0298

  Multilayer circuits · CPC title

• H05K3/429

  Plated through-holes specially for multilayer circuits, e.g. having connections to inner circuit layers · CPC title

• H02M3/06

  using resistors or capacitors, e.g. potential divider · CPC title

• H05K2201/086

  for inductive purposes, e.g. printed inductor with ferrite core · CPC title