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公开(公告)号：US20220155351A1
公开(公告)日：2022-05-19
申请号：US17432384
申请日：2020-03-26
Inventor： YUTA SATO , HIROHIDE ICHIHASHI , MITSURU TOMITA , MASAKAZU KOBAYASHI , MANABU HASHIMOTO
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.
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公开(公告)号：US20150270052A1
公开(公告)日：2015-09-24
申请号：US14636995
申请日：2015-03-03
Inventor： AKIRA KATO , KAZUYUKI SAKIYAMA , HIROHIDE ICHIHASHI
Abstract: A coil structure includes: a magnetic core that defines a closed loop magnetic path in which a magnetic flux flows, the magnetic core including a core leg; a coil that is wound around the core leg about a coil axis extending in a first direction, the coil generating the magnetic flux; a detour member that is separate from the magnetic core, the detour member defining a detour magnetic path that detours around the closed loop magnetic path between first and second points, the detour member including a first piece that defines the first point and a second piece that defines the second point; and a fixing portion that includes an adjoining member adjoining the core leg and a connecting portion connecting at least one of the first piece and the second piece to the adjoining member and fixes positional relations among the core leg and the first and second points.
Abstract translation: 线圈结构包括：磁芯，其限定磁通量流过的闭环磁路，所述磁芯包括芯腿; 线圈，其围绕围绕所述芯腿卷绕在沿第一方向延伸的线圈轴线缠绕，所述线圈产生所述磁通量; 与磁芯分离的迂回构件，绕道构件限定围绕第一和第二点之间的闭环磁路绕行的绕路磁路，迂回构件包括限定第一点的第一件和第二件， 定义第二点; 以及固定部，其包括邻接所述芯腿的邻接构件和将所述第一构件和所述第二构件中的至少一个连接到所述邻接构件的连接部，并且固定所述芯腿与所述第一点和所述第二点之间的位置关系。
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公开(公告)号：US20220034943A1
公开(公告)日：2022-02-03
申请号：US17429134
申请日：2020-03-26
Inventor： YUTA SATO , HIROHIDE ICHIHASHI , MITSURU TOMITA , MASAKAZU KOBAYASHI
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.
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公开(公告)号：US20220308093A1
公开(公告)日：2022-09-29
申请号：US17442560
申请日：2020-02-25
Inventor： YUTA SATO , HIROHIDE ICHIHASHI , KAZUTAKA IKEDA
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.
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