Shunt resistance type current sensor

Patent metadata

Field	Value
Publication number	US-9395396-B2
Application number	US-201314413551-A
Country	US
Kind code	B2
Filing date	Jun 19, 2013
Priority date	Jul 11, 2012
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

A shunt resistance type current sensor includes a bus bar that is a path of an electric current to be measured, a circuit board that is installed over the bus bar, a pair of connecting members that electrically connect the circuit board with the bus bar, a voltage detection unit that is provided on the circuit board and detects a voltage value applied to the circuit board through the pair of connecting members so as to calculate a level of the electric current flowing through the bus bar, and a temperature sensor that is provided on the circuit board to face the bus bar and detects a temperature of the bus bar to allow the voltage detection unit to perform a correction regarding the calculation of the level of the electric current.

First claim

The invention claimed is:

1. A shunt resistance type current sensor comprising:
a bus bar that is a path of an electric current to be measured;
a circuit board that is installed over the bus bar;
a pair of connecting members that electrically connect the circuit board with the bus bar;
a voltage detection unit that is provided on the circuit board and detects a voltage value applied to the circuit board through the pair of connecting members so as to calculate a level of the electric current flowing through the bus bar; and
a temperature sensor that is provided on the circuit board to face the bus bar and detects a temperature of the bus bar to allow the voltage detection unit to perform a correction regarding the calculation of the level of the electric current;
wherein the voltage detection unit includes a temperature detection portion for detecting the temperature of the bus bar, and determines an abnormality of the temperature sensor based on the temperature detected by the temperature detection portion and the temperature detected by the temperature sensor.

2. The shunt resistance type current sensor according to claim 1 , wherein the voltage detection unit determines that the temperature sensor is abnormal, when a difference between the temperature detected by the temperature detection portion and the temperature detected by the temperature sensor is greater than a predetermined value.

3. The shunt resistance type current sensor according to claim 1 further comprising a high thermal conductivity material that is disposed between the bus bar and the circuit board to thermally connect the bus bar and the circuit board.

Assignees

• Yazaki Corp

Inventors

• Kageyama Emi
• Sato Takashi

Classifications

• G01R31/364

  Battery terminal connectors with integrated measuring arrangements · CPC title

• G01R19/32 Primary

  Compensating for temperature change · CPC title

• G01R15/146

  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

• 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

• G01R31/3696

  Physics · mapped topic