Asahi Kasei Kabushiki Kaisha

Asahi Kasei Emd Corporation

Shuichi Nagano

Kazutoshi Ishibashi

Koji Shibahara

Horst-Lothar Fiedler

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

A sensor produces an output that changes linearly with absolute temperature. In response to the output, a reference voltage generator produces reference voltages Vhigh and Vlow that change linearly with absolute temperature. A Schmidt trigger compares the output signal from a sensor signal amplifier with the reference voltages for performing on-off output. A sensor signal amplifier with a temperature-independent amplification factor amplifies the output signal from the sensor while performing offset compensation. A sensor signal processing circuit is formed out of thin-film silicon disposed on an insulating substrate. The output from the sensor undergoes accurate temperature compensation over a wide temperature range from a low temperature to a high temperature, achieving a reliable operation with accuracy at high temperature.

Growing community of inventors

Numazu, Japan

Shuichi Nagano