US 11,835,552 B2
Electric current detection device and electric current detection method
Naoki Takigashira, Kanagawa (JP); Masanori Yamashita, Kanagawa (JP); and Kouichi Matsuda, Kanagawa (JP)
Assigned to NISSAN MOTOR CO., LTD., Yokohama (JP); and RENAULT S.A.S., Boulogne-Billancourt (FR)
Appl. No. 17/927,075
Filed by NISSAN MOTOR CO., LTD., Yokohama (JP); and RENAULT S.A.S., Boulogne-Billancourt (FR)
PCT Filed May 28, 2020, PCT No. PCT/IB2020/000514
§ 371(c)(1), (2) Date Nov. 22, 2022,
PCT Pub. No. WO2021/240192, PCT Pub. Date Dec. 2, 2021.
Prior Publication US 2023/0204631 A1, Jun. 29, 2023
Int. Cl. G01R 19/00 (2006.01); G01R 15/14 (2006.01)
CPC G01R 19/0092 (2013.01) [G01R 15/146 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A current detection device comprising:
a shunt resistor connected in series to a path through which a current flows;
a first circuit that converts a voltage across the shunt resistor into a predetermined differential voltage;
a second circuit to which the predetermined differential voltage is input from the first circuit via a pair of wirings, the second circuit amplifying the predetermined differential voltage;
a constant current circuit connected between the pair of wirings; and
an arithmetic circuit that operates the current flowing through the path based on the voltage amplified by the second circuit,
wherein the constant current circuit adjusts an output voltage range of the second circuit.