Smallest contactless current sensor minimises power loss

December 21, 2018 //By Nick Flaherty
Smallest contactless current sensor minimises power loss
Rohm has launched a contactless current sensor that is says is the industry's smallest.

The BM14270MUV-LB achieves minimum power loss with no heat generation in a 3.5mm 2 footprint for industrial equipment and consumer devices that detect operating conditions via current, including battery-driven drones, solar power systems, and servers in data centres requiring high power. 

Conventional current sensors using hall elements typically feature large current consumption and low sensitivity, making it necessary to draw current within the sensing element itself. As such until now there were no current sensors on the market that provided high reliability and low loss in a compact form factor.

Instead the Rohm current sensor uses a high sensitivity low current MI element that allows for completely contactless current detection. The BM14270MUV-LB was developed by combining Rohm's semiconductor production and sensor control technologies with Aichi Steel’s MI (Magneto-Impedance) element. The result is a contactless current sensor that eliminates the need to draw current within the sensor to measure it. The sensor itself consumes very low current (0.07mA – 100x smaller than conventional products)and includes a disturbance magnetic field cancellation function to protect against noise, making shielding unnecessary. Digital output from the built-in A to D converter reduces MCU load, facilitating easy current monitoring. These features allow users to easily detect the current of virtually any application with high reliability, from compact battery-driven devices to high power industrial equipment.

Samples will be available in Janaury with production in April.

www.rohm.com/eu

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