Alps Alpine Co., Ltd.

Alps Green Devices Co., Ltd.

Yasuo Kotera

Manabu Tamura

Ken Matsue

Hisanori Kiyomatsu

A current sensor includes a plurality of unit groups mounted in a first case and a current sensor includes a first case that is made of a resin and includes a first opposing part, a second case that is made of a resin and includes a second opposing part, a substrate mounted in at least one of the first case and second case, and a plurality of unit groups mounted in the first case and second case, each unit group measuring an induced magnetic field. second case, each unit group measuring an induced magnetic field. Each of the plurality of unit groups includes one or more measurement units arranged in a second direction. A current path and a first magnetic shield, each of which is formed integrally with a first opposing part, are positioned so as to be separated by a first distance. In all unit groups, all first distances are substantially the same. The current path and a magneto-electric conversion element, which is formed integrally with a second opposing part, are positioned so as to be separated by a second distance. In all measurement units included in a unit group shared among them, all second distances are substantially the same. The second distance differs for each unit group. The thickness of the first opposing part in a first direction is substantially constant. The thickness of the second opposing part in the first direction is substantially constant.

Current sensor

There is provided a current sensor capable of performing malfunction determination with high accuracy even under the influence of an adscititious magnetic field. A current sensor includes first and second current sensor units, a computation unit, a storage unit, and a determination processing unit. The first current sensor unit measures a target current. The first and second current sensor units have almost the same sensitivity. The computation unit calculates and outputs an addition value and a difference value of outputs of the first and second current sensor units. In the storage unit, the addition and difference values output from the computation unit are stored. The determination processing unit determines whether a malfunction has occurred by using the addition and difference values stored in the storage unit. The determination processing unit determines that a malfunction has occurred, in a case where there is a correlation between the addition and difference values.

Growing community of inventors

Miyagi-ken, Japan

Yasuo Kotera