公开(公告)号：US12203962B2

公开(公告)日：2025-01-21

申请号：US17442560

申请日：2020-02-25

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuta Sato ,  Hirohide Ichihashi ,  Kazutaka Ikeda

IPC: G01R15/18 ,  G01R1/20 ,  G01R19/00 ,  G01R19/25 ,  H01F38/30

Abstract: A current measurement system is configured to measure an alternating-current (AC) current flowing through a conductor. The AC current has a frequency within a measurement range. The system includes a current sensor and a shunt resistor. The current sensor includes a measurement coil configured to be magnetically coupled to the conductor. The shunt resistor has both ends electrically connected to both ends of the measurement coil, respectively. An output voltage across the both ends of the shunt resistor is saturated at a saturation point in a saturation frequency of the frequency of the AC current. An upper limit value of the measurement range including the frequency is higher than a fundamental frequency of the AC current. The saturation frequency is higher than or equal to the upper limit value. The current measurement system improves sensitivity to frequency components higher than the fundamental frequency of the AC current.

公开(公告)号：US11761989B2

公开(公告)日：2023-09-19

申请号：US17429134

申请日：2020-03-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuta Sato ,  Hirohide Ichihashi ,  Mitsuru Tomita ,  Masakazu Kobayashi

IPC: G01R15/18 ,  G01R19/15

CPC classification number: G01R15/186 ,  G01R19/15

Abstract: A current sensor is configured to detect a current flowing through an electrical conductor. The current sensor includes a core and a coil wound around the core. The core has a hollow therein configured to allow the electrical conductor to pass through the hollow. The core substantially has a C-shape having a gap connected to the hollow. The core has a pair of end surfaces facing each other in a facing direction across the gap. The core includes plural split cores joined to one another. Each pair of split cores of the plural split cores adjacent to each other have respective joining surfaces joined to each other. The respective joining surfaces of the each pair of split cores being parallel to the facing direction. This current sensor has a desired sensitivity characteristic.

公开(公告)号：US11726113B2

公开(公告)日：2023-08-15

申请号：US17432384

申请日：2020-03-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuta Sato ,  Hirohide Ichihashi ,  Mitsuru Tomita ,  Masakazu Kobayashi ,  Manabu Hashimoto

IPC: G01R31/18 ,  G01R15/18 ,  G01R19/00

CPC classification number: G01R15/186 ,  G01R19/0053

Abstract: A current sensor is configured to detect a current flowing through an electrical conductor. The current sensor includes a core and a coil wound around the core. The core has a hollow configure to allow the electrical conductor to pass through the hollow. The core substantially has a C-shape haying a gap connected to the hollow. At least a part of the gap of the core is located inside the coil. This current sensor suppresses the influence of external noise.