Development of a Wireless Current Measurement Sensor Node for IoT Applications
Resumo
This work presents the development of an industrial Internet of Things device for current measurement. It is employed a current transformer that is responsible not only for harvesting energy from an electric load but also as an ordinary sensor for current measurement. After proper energy harvesting, a microcontroller unit reads the current through the circuit using its own analog to digital converter. Then, having the acquired data, it transmits by radio frequency to a receiving device, which in turn sends to the Internet. A supercapacitor is used as a reservoir, so the microcontroller can transmit even in the lack of external energy. Also, the microcontroller unit turn off itself from the harvesting circuit in order to measure the current without any error introduced by its own power consumption. A sub-gigahertz wireless sensor network is implemented using a developed sensor node and a proprietary stack is also developed and presented. The experimental procedure showed the sensor node ability to provide 24 transmissions with no power except from the harvesting circuit.
Referências
Wedell, Alex S., et al. 2011. Accurate Supercapacitor Modeling for Energy-Harvesting Wireless Sensor Nodes. IEEE Transactions on Circuits and Systems II: Express Briefs. 2011, pp. 911 - 915.
Bach, Christian. 2009. Current Sensor – Power Line Monitoring for Energy Demand Control. Available at: https://www.enocean.com/fileadmin/redaktion/pdf/app_notes/AN308_C URRENT_SENSOR_Jan09.pdf.
Muller, Ivan, et al. Energy Consumption Estimation for TDMA-based Industrial Wireless Sensor Networks. Industrial Informatics (INDIN), IEEE 14th International Conference on. 2016.
Bach, Christian. 2011. Energy management of the STM 300, functioning principle. Available at: https://www.enocean.com/fileadmin/redaktion/pdf/app_notes/AN208_STM_300_Energy_Storage_Feb2011.pdf.
Bach, Christian. 2009. Current Sensor – Power Line Monitoring for Energy Demand Control. Available at: https://www.enocean.com/fileadmin/redaktion/pdf/app_notes/AN308_CURRENT_SENSOR_Jan09.pdf.
Mars, P. Coupling a Supercapacitor with a Small Energy Harvesting Source. CAP XX. Available at: https://www.eetimes.com/document.asp?doc_id=1279362.
Texas Instruments. 2017. Energy Harvesting From Current Transformer With Supercapacitor for Fault Indicator Reference Design. Available at: http://www.ti.com/lit/ug/tidud59/tidud59.
Cultura II, A. B. and Salameh, Z. M. Cisia. Modeling, Evaluation and Simulation of a Supercapacitor Module for Energy Storage Application. 2015, pp. 876 - 882.
Ahola, J., et al. Design considerations for current transformer based energy harvesting for electronics attached to electric motor. Speedham 2008. DOI: 10.1109/SPEEDHAM.2008.4581191
Campbell, B. and Dutta, P. Gemini: A Non-Invasive, Energy-Harvesting True Power Meter. Real-Time Systems Symposium (RTSS), 2014 IEEE.
