Current detection apparatus and power supply control apparatus

Patent metadata

Field	Value
Publication number	US-11899043-B2
Application number	US-202017605466-A
Country	US
Kind code	B2
Filing date	Apr 14, 2020
Priority date	Apr 26, 2019
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

Provided is current detection apparatus for detecting current flowing through a power supply path of a power supply control apparatus. The power supply path includes a first conductor and a second conductor. The current detection apparatus includes: a first and a second shunt resistor connected in parallel between the first and the second conductor, and a current detection circuit detecting: (1) current flowing through the first shunt resistor; and (2) current flowing from the first to the second conductor via both the first and second shunt resistors. The current detection apparatus further includes an arithmetic circuit that calculates current flowing through the power supply path based on a correlative relationship between the current flowing from the first to the second conductor via both the first and the second shunt resistor and current flowing through the first shunt resistor, and the current detected by the current detection circuit.

First claim

The invention claimed is:

1. A current detection apparatus for detecting current flowing through a power supply path of a power supply control apparatus,
wherein the power supply path includes a flat plate-shaped first conductor, second conductor, and third conductor that are arranged on a substrate,
the current detection apparatus further comprises:
a first semiconductor switching element and a second semiconductor switching element that are connected in parallel between the first conductor and the third conductor arranged on the substrate,
a first shunt resistor and a second shunt resistor that are connected in parallel between the first conductor and the second conductor arranged on the substrate;
a current detection circuit that is arranged on the substrate and is configured to detect current flowing through the first shunt resistor; and
an arithmetic circuit arranged on the substrate, and

the arithmetic circuit calculates current flowing through the power supply path based on a correlation between current flowing from the first conductor to the second conductor via both the first shunt resistor and the second shunt resistor and current flowing through the first shunt resistor, and the current detected by the current detection circuit.

2. The current detection apparatus according to claim 1 , wherein a first path in which current flows through the power supply path via the first shunt resistor has a smaller current division ratio than a second path in which current flows through the power supply path via the second shunt resistor.

3. The current detection apparatus according to claim 2 , wherein a path resistance of the first path in which current flows through the power supply path via the first shunt resistor is greater than a path resistance of the second path in which current flows through the power supply path via the second shunt resistor.

4. The current detection apparatus according to claim 2 , wherein the first path in which current flows through the power supply path via the first shunt resistor is longer than a second path in which current flows through the power supply path via the second shunt resistor.

5. The current detection apparatus according to claim 2 , wherein the distance between the first shunt resistor and the second shunt resistor is 5 mm or less.

6. The current detection apparatus according to claim 1 , wherein a path resistance of the first path in which current flows through the power supply path via the first shunt resistor is greater than a path resistance of the second path in which current flows through the power supply path via the second shunt resistor.

7. The current detection apparatus according to claim 6 , wherein the first path in which current flows through the power supply path via the first shunt resistor is longer than a second path in which current flows through the power supply path via the second shunt resistor.

8. The current detection apparatus according to claim 6 , wherein the distance between the first shunt resistor and the second shunt resistor is 5 mm or less.

9. The current detection apparatus according to claim 1 , wherein the first path in which current flows through the power supply path via the first shunt resistor is longer than a second path in which current flows through the power supply path via the second shunt resistor.

10. The current detection apparatus according to claim 9 , wherein the distance between the first shunt resistor and the second shunt resistor is 5 mm or less.

11. The current detection apparatus according to claim 1 , wherein the distance between the first shunt resistor and the second shunt resistor is 5 mm or less.

12. A power supply control apparatus including the current detection apparatus according to claim 1 .

13. The power supply control apparatus according to claim 12 , wherein a first path in which current flows through the power supply path via the first shunt resistor has a smaller current division ratio than a second path in which current flows through the power supply path via the second shunt resistor.

14. The power supply control apparatus according to claim 12 , wherein a path resistance of the first path in which current flows through the power supply path via the first shunt resistor is greater than a path resistance of the second path in which current flows through the power supply path via the second shunt resistor.

15. The power supply control apparatus according to claim 12 , wherein the first path in which current flows through the power supply path via the first shunt resistor is longer than a second path in which current flows through the power supply path via the second shunt resistor.

Assignees

• Autonetworks Technologies Ltd
• Sumitomo Wiring Systems
• Sumitomo Electric Industries

Inventors

• Masuda Ryosuke
• Kato Masayuki
• Sawano Shunichi

Classifications

• G01R15/146 Primary

  Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop (if no voltage isolation is involved G01R1/203 or G01R19/0092) · CPC title

• G01R19/2513

  Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging · CPC title

• G01R19/0092 Primary

  Measuring current only · CPC title

• G01R1/203

  Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts (resistors in general H01C; microwave or radiowave terminations H01P1/26; coupling devices H01R) · CPC title