CURRENT DETECTOR

• US 20110224937A1
• Filed: 01/27/2011
• Published: 09/15/2011
• Est. Priority Date: 03/09/2010
• Status: Abandoned Application

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: NISHIMURA, Keisuke
• Application Number:
  US13/014,916
• Publication Number:
  US 20110224937A1
• Time in Patent Office: Days
• US Class Current: 702/106
• CPC Class Codes: G01R 15/202 using Hall-effect devices Hall elements in arrangements for measuring electrical power G01R21/08
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 31/343 in operation
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

Provided is a current detector that, even when the skin effect occurs in a conductor in which a current flows, can detect the current flowing in the conductor with high accuracy. A sensor part that is provided near a conductor and detects magnetic flux in a predetermined magnetic flux detection direction, a current detection part that detects a current flowing in the conductor based on a detection value of the sensor part, a current frequency acquisition part that acquires a current frequency as a frequency of the current flowing in the conductor, and a correction part that corrects the detection value of the sensor part based on the current frequency are provided.

Claims

1. A current detector comprising:

a sensor part that is provided near a conductor having an outer shape with a sectional shape in which a distance from the center of gravity to an outer peripheral surface is non-uniform and detects magnetic flux in a predetermined magnetic flux detection direction;

a current detection part that detects a current flowing in the conductor based on a detection value of the sensor part;

a current frequency acquisition part that acquires a current frequency as a frequency of the current flowing in the conductor; and

a correction part that corrects the detection value of the sensor part based on the current frequency.

2. The current detector according to claim 1, wherein the conductor supplies a drive current when an alternating-current rotating electric machine functions as an electric motor and regenerates a power generation current when the machine functions as a power generator, and the current frequency acquisition part acquires the current frequency based on a rotational speed of the alternating-current rotating electric machine.

3. The current detector according to claim 2, wherein the correction part corrects the detection value by multiplying the detection value of the sensor part by a coefficient in response to the current frequency.

4. The current detector according to claim 2, wherein the correction part corrects the detection value by changing a dynamic range of the sensor part in response to the current frequency.

5. The current detector according to claim 2, wherein the correction part corrects the detection value based on a map in which a correction value in response to the current frequency is stored.

6. The current detector according to claim 1, wherein the current frequency acquisition part acquires the current frequency based on a detection result of the sensor part or the current detection part.

7. The current detector according to claim 6, wherein the correction part corrects the detection value by multiplying the detection value of the sensor part by a coefficient in response to the current frequency.

8. The current detector according to claim 6, wherein the correction part corrects the detection value by changing a dynamic range of the sensor part in response to the current frequency.

9. The current detector according to claim 3, wherein the correction part corrects the detection value based on a map in which a correction value in response to the current frequency is stored.

10. The current detector according to claim 1, wherein the correction part corrects the detection value by multiplying the detection value of the sensor part by a coefficient in response to the current frequency.

11. The current detector according to claim 1, wherein the correction part corrects the detection value by changing a dynamic range of the sensor part in response to the current frequency.

12. The current detector according to claim 1, wherein the correction part corrects the detection value based on a map in which a correction value in response to the current frequency is stored.

13. The current detector according to claim 1, wherein the sectional shape is a flat shape including a rectangular shape and an oval shape.