Power conversion device and high-voltage noise filter

Patent metadata

Field	Value
Publication number	US-11257616-B2
Application number	US-201916720995-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Dec 20, 2018
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A high-voltage noise filter of a power conversion device includes: a metal housing; an anode bus bar connecting anodes of a power source and a power module; a cathode bus bar connecting cathodes thereof; a first magnetic core having a through hole where the anode bus bar and the cathode bus bar pass through; an X capacitor having one end connected to the anode bus bar, and the other end connected to the cathode bus bar; a first Y capacitor having one end connected to the anode bus bar, and the other end grounded; a second Y capacitor having one end connected to the cathode bus bar, and the other end grounded; and a first cooling unit connected to the first magnetic core and the metal housing. The anode bus bar partly faces the first cooling unit, and the cathode bus bar partly faces the first cooling unit.

First claim

What is claimed is:

1. A power conversion device comprising:
a power module configured to convert DC current to AC current; and
a high-voltage noise filter configured to suppress an electromagnetic noise generated from the power module,
the high-voltage noise filter including:
a metal housing that is grounded;
an anode bus bar connecting an anode of a power source of the DC current and an anode of the power module;
a cathode bus bar connecting a cathode of the power source and a cathode of the power module;
a first magnetic core formed in an annular shape and having a through hole where the anode bus bar and the cathode bus bar are made to pass through;
an X capacitor having one end connected to the anode bus bar and having another end connected to the cathode bus bar;
a first Y capacitor having one end connected to the anode bus bar and having another end grounded;
a second Y capacitor having one end connected to the cathode bus bar and having another end grounded; and
a first cooling unit connected to the first magnetic core and the metal housing, wherein
a part of the anode bus bar is arranged in a manner facing the first cooling unit, and
a part of the cathode bus bar is arranged in a manner facing the first cooling unit.

2. The power conversion device according to claim 1 , wherein
the first cooling unit has a flat surface portion in contact with an annular flat surface of the first magnetic core.

3. The power conversion device according to claim 1 , wherein
the first cooling unit includes a holding portion connected to an outer peripheral curved surface of the first magnetic core.

4. The power conversion device according to claim 1 , wherein
the first cooling unit includes: a flat surface portion in contact with an annular flat surface of the first magnetic core; and a holding portion connected to an outer peripheral curved surface of the first magnetic core.

5. The power conversion device according to claim 1 , wherein,
in the first cooling unit, a portion arranged in a manner facing the part of the anode bus bar and a portion arranged in a manner facing the part of the cathode bus bar are separated.

6. The power conversion device according to claim 1 , wherein,
in the first cooling unit, a portion arranged in a manner facing the part of the anode bus bar and a portion arranged in a manner facing the part of the cathode bus bar are integrated.

7. The power conversion device according to claim 2 , wherein
the anode bus bar is bent into a protruding shape, and a part of the protruding shape of the anode bus bar is arranged in a manner facing the flat surface portion of the first cooling unit, and
the cathode bus bar is bent into a protruding shape, and a part of the protruding shape of the cathode bus bar is arranged in a manner facing the flat surface portion of the first cooling unit.

8. The power conversion device according to claim 1 , wherein
the high-voltage noise filter includes:
a second magnetic core formed in an annular shape and having a through hole where the anode bus bar and the cathode bus bar are made to pass through; and
a second cooling unit connected to the second magnetic core and the metal housing,
a part of the anode bus bar is arranged in a manner facing the second cooling unit, and
a part of the cathode bus bar is arranged in a manner facing the second cooling unit.

9. The power conversion device according to claim 8 , wherein
the first magnetic core is arranged on the power module side of the first Y capacitor and the second Y capacitor,
the second magnetic core is arranged on the power source side of the first Y capacitor and the second Y capacitor.

10. The power conversion device according to claim 8 , wherein
the first cooling unit has a first flat surface portion in contact with an annular flat surface of the first magnetic core, and
the second cooling unit has a second flat surface portion in contact with an annular flat surface of the second magnetic core.

11. The power conversion device according to claim 10 , wherein
the anode bus bar is bent into a protruding shape, a part of the protruding shape of the anode bus bar is arranged in a manner facing the first flat surface portion of the first cooling unit, and another part of the protruding shape of the anode bus bar is arranged in a manner facing the second flat surface portion of the second cooling unit, and
the cathode bus bar is bent into a protruding shape, a part of the protruding shape of the cathode bus bar is arranged in a manner facing the first flat surface portion of the first cooling unit, and another part of the protruding shape of the cathode bus bar is arranged in a manner facing the second flat surface portion of the second cooling unit.

12. The power conversion device according to claim 1 , further comprising, on an opposite side of the first magnetic core to which the X capacitor is not connected:
a third Y capacitor having one end connected to the anode bus bar and having another end grounded;
a fourth Y capacitor having one end connected to the cathode bus bar and having another end grounded; and
a first cooling unit and a second cooling unit which are connected to the first magnetic core and the metal housing, wherein
a part of an anode bus bar located on a side where the X capacitor is arranged is arranged in a manner facing the first cooling unit,
a part of a cathode bus bar located on the side where the X capacitor is arranged is arranged in a manner facing the first cooling unit,
a part of the anode bus bar located on a side where the X capacitor is not arranged is arranged in a manner facing the second cooling unit, and
a part of the cathode bus bar located on the side where the X capacitor is not arranged is arranged in a manner facing the second cooling unit.

13. The power conversion device according to claim 12 , wherein
each of the first cooling unit and the second cooling unit includes a flat surface portion in contact with the annular flat surface of the first magnetic core.

14. The power conversion device according to claim 12 , wherein
each of the first cooling unit and the second cooling unit includes a holding portion connected to an outer peripheral curved surface of the first magnetic core.

15. The power conversion device according to claim 12 , wherein
each of the first cooling unit and the second cooling unit includes a flat surface portion in contact with the annular flat surface of the first magnetic core, and a holding portion connected to an outer peripheral curved surface of the first magnetic core.

16. The power conversion device according to claim 12 , wherein
in each of the first cooling unit and the second cooling unit, a portion arranged in a manner facing the part of the anode bus bar and a portion arranged in a manner facing the part of the cathode bus bar are separated.

17. The power conversion device according to claim 12 , wherein
in each of the first cooling unit and the second cooling unit, a portion arranged in a manner facing the part of the anode bus bar and a portion arranged in a manner facing the part of the cathode bus bar are integrated.

18. The power conversion device according to claim 13 , wherein
the anode bus bar is bent into a protruding shape, and a part of the protruding shape of the anode bus bar is arranged in a manner facing the flat surface portion of each of the first cooling unit and the second cooling unit, and
the cathode bus bar is bent into a protruding shape, and a part of the protruding shape of the cathode bu

Assignees

• Hitachi Ltd

Inventors

• Noda Masaki
• Funato Hiroki
• Hoda Isao
• Taniguchi Hitoshi

Classifications

• H01F27/40

  Structural association with built-in electric component, e.g. fuse · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H01F27/025

  Constructional details relating to cooling · CPC title

• H02M7/537

  using semiconductor devices only, e.g. single switched pulse inverters · CPC title

• H02M7/003

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title