Current sensor and its manufacturing method, electrical control device, and current sensor design method

摘要

PROBLEM TO BE SOLVED: To reduce a measurement error when a conductor is not energized, improve measurement accuracy, and reduce the thickness of a current sensor, a manufacturing method thereof, an electric control device provided with the current sensor, and a design method of the current sensor. I will provide a. A current sensor includes a magnetic detection unit capable of detecting magnetism, a first magnetic shield, and a second magnetic shield, and a first magnetic shield is provided on each of the first shield portion and the vicinity of both ends thereof. It has two continuous second shield portions, and the second magnetic shield has two continuous fourth shield portions in the vicinity of the third shield portion and both ends thereof, and has a first shield portion and a third shield portion. There is a conductor placement area between the parts, the magnetic detection part is located between the first shield part and the conductor placement area, and the magnetic detection part is in the third direction of the two fourth shield parts. In relation to the length along the conductor, it is provided at a magnetic field canceling position where the magnetic field in the second direction at the time of non-energization after a predetermined current flows through the conductor becomes substantially zero. [Selection diagram] Fig. 1