Patent ID: 9377491
Filing Date: 2016-06-28
CPC Classification: G01R

Claim Text:
1. A shunt resistor based current sensor comprising: a busbar that includes a shunt resistor portion, and that has a substantially planar plate shape; a circuit board that is disposed on the busbar; a pair of connection terminal portions that are disposed corresponding to both end portions of the shunt resistor portion, and that are electrically connected to the circuit board; a voltage detecting unit that is disposed on the circuit board, and that detects a value of a voltage which is applied to the circuit board through the pair of connection terminal portions, in order to detect a magnitude of a current to be measured flowing through the busbar; and a temperature detecting unit that is disposed on the circuit board, and that detects a temperature of a vicinity of the busbar in order to allow the voltage detecting unit to perform correction, wherein the temperature detecting unit is placed positionally corresponding to a central portion of the shunt resistor portion in the busbar; and wherein, interposed between the busbar and the circuit board is a connecting portion that thermally couples the busbar to the temperature detecting unit.