Voltage filter and power conversion device

Patent metadata

Field	Value
Publication number	US-10979014-B2
Application number	US-201916682032-A
Country	US
Kind code	B2
Filing date	Nov 13, 2019
Priority date	Nov 15, 2018
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

To improve the performance of the voltage filter. Rather than reducing an area of a region surrounded by a closed loop formed in a voltage filter 12 A, an induced electromotive force generated in the voltage filter 12 A itself is reduced by forming a pair of a closed loop CA and a closed loop CB in which the directions of the generated induced electromotive forces are opposite to each other by making a wiring 100 (anode wiring) intersect a wiring 200 (cathode wiring).

First claim

What is claimed is:

1. A voltage filter comprising:
a first cathode terminal and a first anode terminal aligned in a second direction orthogonal to a first direction;
a first cathode relay terminal which is electrically connected to the first cathode terminal via a first cathode wiring and aligned with the first anode terminal in the first direction;
a first anode relay terminal which is electrically connected to the first anode terminal via a first anode wiring and aligned with the first cathode terminal in the first direction;
a second cathode terminal which is electrically connected to the first cathode relay terminal via a second cathode wiring and aligned with the first cathode relay terminal in the first direction;
a second anode terminal which is electrically connected to the first anode relay terminal via a second anode wiring, and aligned with the first anode relay terminal in the first direction;
a first capacitive element which is electrically connected between the second cathode wiring and the second anode wiring; and
a second capacitive element and a third capacitive element which are connected in series between the first cathode wiring and the first anode wiring, wherein
the first cathode wiring and the first anode wiring intersect at an intersection,
the second capacitive element is provided closer to a side of the first cathode terminal than the intersection, and
the third capacitive element is also provided closer to a side of the first anode terminal than the intersection.

2. The voltage filter according to claim 1 , wherein
the second cathode wiring is composed of a cathode bus bar, and
the second anode wiring is composed of an anode bus bar.

3. The voltage filter according to claim 2 further comprising:
an LC filter, wherein
the LC filter includes
a parasitic inductance included in the second cathode wiring;
a parasitic inductance included in the second anode wiring; and
a capacitance of the first capacitive element.

4. A power conversion device, comprising:
an inverter configured to generate an AC voltage from a DC voltage for driving a motor;
a control unit configured to control the inverter; and
a voltage filter configured to be electrically connected to the inverter, wherein
the voltage filter includes
a first cathode terminal and a first anode terminal aligned in a second direction orthogonal to a first direction;
a first cathode relay terminal which is electrically connected to the first cathode terminal via a first cathode wiring and aligned with the first anode terminal in the first direction;
a first anode relay terminal which is electrically connected to the first anode terminal via a first anode wiring and aligned with the first cathode terminal in the first direction;
a second cathode terminal which is electrically connected to the first cathode relay terminal via a second cathode wiring and aligned with the first cathode relay terminal in the first direction;
a second anode terminal which is electrically connected to the first anode relay terminal via a second anode wiring, and aligned with the first anode relay terminal in the first direction;
a first capacitive element which is electrically connected between the second cathode wiring and the second anode wiring; and
a second capacitive element and a third capacitive element which are connected in series between the first cathode wiring and the first anode wiring, wherein

the first cathode wiring and the first anode wiring intersect at an intersection,
the second capacitive element is provided closer to a side of the first cathode terminal than the intersection, and
the third capacitive element is also provided closer to a side of the first anode terminal than the intersection.

5. The power conversion device according to claim 4 , wherein
the second cathode wiring is composed of a cathode bus bar, and
the second anode wiring is composed of an anode bus bar.

6. The power conversion device according to claim 4 , further comprising:
an LC filter, wherein
the LC filter includes
a parasitic inductance included in the second cathode wiring;
a parasitic inductance included in the second anode wiring; and
a capacitance of the first capacitive element.

Assignees

• Hitachi Ltd

Inventors

• Taniguchi Hitoshi
• Funato Hiroki

Classifications

• H02M1/123

  Suppression of common mode voltage or current · CPC title

• H01G4/35

  Feed-through capacitors or anti-noise capacitors · CPC title

• H02M1/126 Primary

  using passive filters · CPC title

• H03H7/427

  Common-mode filters (H02J3/01 and H02M1/126 takes precedence) · CPC title

• H02M7/5395

  by pulse-width modulation · CPC title