ROHM has recently announced the availability of the industry’s smallest contactless current sensor, the BM14270MUV-LB. It achieves minimum power loss (no heat generation) in an ultra-compact size, making it ideal 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.
ROHM developed a current sensor utilizing a high sensitivity low current MI element that allows for completely contactless current detection. The BM14270MUV-LB was developed by combining ROHM’s industry-leading 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.
Going forward, ROHM will continue to contribute to increase comfort and safety of the society by developing high-performance, high reliability sensors demanded by the IoT and industrial equipment markets.
- Contactless current detection achieves greater system reliability with minimum power loss
Conventional products utilizing Hall elements cannot detect current without drawing current into the sensor itself, generating both loss and heat and possibly causing system stoppage in the event the sensor fails or is damaged. In contrast, the BM14270MUV-LB enables contactless current detection by using a high sensitivity MI sensor.
- Compact, ultra-low-current design optimized for battery-driven devices
In conventional products, current consumed by the Hall element is large, resulting in a current consumption of around 10mA for Hall-based current sensors. On the other hand, ROHM’s latest product using MI technology achieves an industry-low current consumption of just 0.07mA (0.35mW power consumption at 5V operation) – 100x lower than conventional products.
- Built-in disturbance magnetic field cancellation function eliminates the need for shielding
Typically, in conventional products measurement error occurs due to disturbance magnetic fields, such as those due to geomagnetism (i.e. terrestrial), making it necessary to use shields to block interference. Whereas the BM14270MUV-LB includes a function that cancels disturbance magnetic fields using reciprocal wiring, allowing detection of only the magnetic field of the target current to enable high accuracy measurement without the use of shields.
- Digital output facilitates current detection
Digital output from the built-in A/D converter reduces MCU load when mounted in servers and other high power applications, enabling easy current detection.
For more information, log on https://www.rohm.com