Customer stories

FUJIKURA COMPOSITES Inc.' "Battery-Free Liquid Detection Sensor" is a self-powered liquid detection sensor that utilizes a magnesium-air battery. When liquid comes into contact with the magnesium-air battery, it begins generating power, which is then used to wirelessly transmit data. Since the sensor generates its own power using liquid, there is no risk of battery depletion during standby periods when no leaks are detected, allowing for long-term operation and reducing maintenance needs. Additionally, unlike traditional wired sensors that require manual installation by personnel, this product eliminates that need, making it suitable for applications in locations where wiring and power installation are difficult or for applications that demand cost reduction.　This solution holds significant potential for infrastructure applications, such as detecting water leaks caused by aging water pipes or monitoring river water levels.　It supports quick and efficient flood prevention and infrastructure maintenance.

The liquid detection sensor is equipped with AKM's DC/DC converter for energy harvesting, AP4470. This product step-up the electromotive force from the magnesium-air battery to 3.3 V and outputs it to power other electronic components. Since the step-up circuit built into AP4470 operates with an input voltage of 200 mV or higher, it can generate power even from the small amount of energy provided by just a few drops of liquid. AP4470 can step-up voltage with input power as low as 1 µW, contributing to improved sensitivity in liquid detection.