Asahi Kasei Emd Corporation

Sentron Ag

Koji Shibahara

Robert Racz

Radivoje S Popovic

Kazutoshi Ishibashi

Yo Yamagata

Shuichi Nagano

Osamu Matsumoto

The present invention provides a current measuring apparatus having an improved structure to inhibit the possible adverse effect of a current in a different phase and the possible generation of an induced electromotive force caused by a measurement target current, enabling the measurement target current to be accurately detected even with the small size of the apparatus.

Current measuring apparatus

A low-cost, current sensor suitable for mass production and a manufacturing method thereof are provided. The current sensor is small with high sensitivity and can be packaged in a standard assembly line which is normally used when an integrated circuit is manufactured. Further, it is possible to obtain a sufficient shielding effect against a disturbance flux without degrading the detecting sensitivity of a flux. A first magnetic materialis bonded to the lower part of a current conductorC. The first magnetic materialhas the function of converging and amplifying a fluxgenerated by the current to be measured. A second magnetic materialis bonded above a magnetic sensor chip. The second magnetic materialhas a shielding function against a disturbance flux entering from the outside.

Current sensor and current sensor manufacturing method

A current measuring method capable of reducing the size of a current sensor while ensuring electric insulation easily and suitable for enhancing reliability by preventing heat generation. A current measuring device comprises a printed board () having a conductor for measurement (), and a noncontact current sensor () being mounted on the printed board (), wherein the current sensor () is mounted on the surface () of the printed board () opposite to the side provided with the conductor for measurement (). Since the current sensor () is mounted on the rear surface (), electric insulation between the secondary conductor of the current sensor () and the conductor for measurement () can be ensured relatively easy.

Current measuring method and current measuring device

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Machida, Japan

Koji Shibahara