Small non-contact current sensor with zero power loss “BM14270AMUV-LB”

The world-renowned semiconductor manufacturer ROHM (headquartered in Kyoto, Japan) has developed a variety of industrial equipment and consumer Electronic equipment for high-power data center servers, solar photovoltaic power generation systems, and battery-driven drones that use current to detect working conditions. The non-contact current sensor “BM14270AMUV-LB” integrates the three advantages of non-contact detection, zero power loss (zero heat), and ultra-small size.

Small non-contact current sensor with zero power loss “BM14270AMUV-LB”

In recent years, the global awareness of energy conservation and safety has increased, and environmental protection regulations have become more and more stringent, requiring high-power data center servers and solar photovoltaic power generation systems to realize power visualization and take safety measures. At the same time, the demand for current sensors is increasing year by year. In the past, current sensors using Hall elements consume more current and have lower sensitivity. Therefore, wiring inside the current sensor is required. The market urgently needs small size, low loss, and high reliability. Both current sensors. In response to these issues, ROHM has developed a new product that can detect current without touching it by using MI elements with high sensitivity and low current consumption.

“BM14270AMUV-LB” is a new product that combines the MI element*1 development technology of ROHM’s partner Aichi Steel Co., Ltd., and ROHM’s expertise in semiconductor production technology and sensor control technology advantages. As a current sensor, this product uses MI elements with high sensitivity and low consumption current to achieve non-contact detection (without wiring inside the current sensor), while achieving the industry’s smallest size (3.5mm square) and ultra-low consumption during operation Current (0.07mA, only 1/100 of the previous product). In addition, it also has anti-noise interference magnetic field elimination function, which can be installed on the PCB board without shielding measures. Not only that, the built-in A/D converter uses a digital output, which reduces the burden on the microcontroller and makes it easier to monitor the current. Using the advantages of these products, current detection can be performed with high reliability and ease in a variety of applications, from high-power industrial equipment to small battery-driven equipment.

Samples of this product have been sold in November 2019 (sample price is 1,000 yen/piece, not including tax), and it is expected to be put into mass production temporarily with a monthly output of 100,000 units from January 2020. The production base for the preliminary process is ROHM Apollo Co., Ltd. (Fukuoka, Japan), and the production base for the later process is ROHM Electronics Philippines Inc. (Philippines).

In the future, ROHM will continue to develop high-performance, high-reliability sensor products that are indispensable in the field of industrial equipment and IoT, and contribute to the safety and comfort of society.

Small non-contact current sensor with zero power loss “BM14270AMUV-LB”

<Feature details>

1. Non-contact current detection and zero power loss help improve the reliability of the system

In the past products using Hall elements, if the current line is not laid in the current sensor, the current cannot be detected, and the wiring will cause loss and heating problems. If the current sensor is damaged, the entire system may stop. ROHM’s new product uses the high sensitivity characteristics of MI components to detect current in a non-contact manner. Even in high-voltage applications, there will be no additional loss and heating problems, and no insulation is required. The design is more concise and helpful. To improve the reliability of the system.

2. Small, ultra-low consumption current, very suitable for battery-driven equipment

Conventional products have a large consumption current of the Hall element itself, so when used as a current sensor product, a consumption current of about 10 mA will be generated. The new product utilizes the low consumption current characteristics of MI components to achieve an ultra-low working consumption current of 0.07mA (consumption power at 5V operation is 0.35mW), which is only 1/100th compared with previous products. In addition, compared with the previous size of 6.0mm x 4.9mm, the new product is only 3.5mm square. The industry’s smallest consumption current and ultra-small size are very suitable for battery-driven equipment.

Small non-contact current sensor with zero power loss “BM14270AMUV-LB”

3. It has the function of eliminating the interference magnetic field and can be installed without shielding measures

In the past, products would produce measurement errors due to the influence of terrestrial magnetism and other interfering magnetic fields, and magnetic shielding measures were needed to shield the interference. ROHM’s new product is installed on the reciprocating wiring of the PCB board. The internal double induction unit can eliminate the interference magnetic field that generates noise. It can only detect the magnetic field generated by the current that needs to be measured, so it can achieve high without shielding. Accuracy measurement.

4. Digital output, current detection easier

The built-in A/D converter adopts digital output, which can reduce the burden of the microcontroller when installed in applications such as servers, so that the current can be detected more easily.

<Application example>

◇Applications around infrastructure such as servers, solar photovoltaic power generation systems, power storage systems, power meters, etc.

◇High-power equipment such as robots, FA equipment, air conditioners, etc.

◇Battery-driven applications such as drones

Suitable for various applications in the field of current monitoring and monitoring.

<Explanation of terms>

*1) MI element (Magneto-Impedance element)

Using special amorphous wire components, Aichi Steel Co., Ltd. launched the first in the world. Can detect magnetism and magnetic field. High-sensitivity detection can be performed with a very low consumption current. As a new technology to promote the development of the Internet of Things, it is expected to be applied in various fields.

The Links:   NL2432HC17-01B 2SB1197KT146R