4:15 PM - 4:45 PM
[10p-M121-6] Battery-free Wireless Sensing System with Energy Management Circuits
Keywords:wireless sensor node, energy harvesting, energy management
The collection and use of sensing data have potential applications in overcoming a variety of societal problems. Unfortunately, battery replacement and other maintenance take a lot of work and are obstacles to the wider use of systems that collect data wirelessly from large numbers of installed sensors. In response, we developed wireless sensors that can operate using the small amounts of energy available in the environment.While solar-powered wireless sensors that do not require battery replacement are already available, they are restricted to outdoor use. By developing an ambient energy management circuit that can efficiently collect small amounts of energy from the environment and sensor signal processing circuits that operate on low levels of power without losing their high accuracy, we made it possible to operate wireless sensors using indoor light.We used the technology to build a prototype sensor for measuring the current drawn by industrial machinery and tested its ability to take measurements inside factories.