Tiny contactless current sensor features minimum power loss

December 21, 2018 // By Ally Winning
ROHM has introduced what the company claims is the industry’s smallest contactless current sensor which has minimum power loss in an ultra-compact size, suiting it for industrial equipment and consumer devices that detect operating conditions via current, including battery-driven drones, solar power systems, and servers in data centers requiring high power.

The BM14270MUV-LB uses a high sensitivity low current MI element that allows for completely contactless current detection. It combines ROHM’s semiconductor production and sensor control technologies with Aichi Steel’s MI (Magneto-Impedance) element.

The resulting contactless current sensor eliminates the need to draw current within the sensor to measure it. The sensor itself only consumes 0.07mA current and comes in a 3.5 x 3.5 mm package.

A disturbance magnetic field cancellation function protects against noise, making shielding unnecessary. The digital output from the built-in A/D converter reduces MCU load, facilitating easy current monitoring.


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