Supercapacitors power wireless sensors
Today’s sensors are often wireless, powered by a small battery or an energy harvester which may not be able to provide the peak power necessary for data transmission. CAP-XX supercapacitors can be charged at low power and supply the peak power needed.
Supercapacitors deliver peak power for data transmission.
Most wireless sensors are designed to be long lasting, autonomously powered set and forget units. They are typically powered by a small primary battery or for a maintenance free solution, a small energy harvester. Extremely energy efficient electronics coupled with a low power, low data rate wide area wireless technology is essential but even low data rate, “low power” protocols such as LoRa, NB-IoT, and LTE CAT-M1 which enable reporting over a campus area or wide area require power levels in the range of 0.5W – 1.5W. Even short range reporting using BLE requires a peak of power of 10mW. These power levels are beyond most micro energy harvesters, such as a small solar solar cell, or piezo-electric transducer that typically provide < 1mW. The can charge a supercapacitor at very low power and the supercapacitor provides the peak power when data is transmitted. Most batteries can support BLE transmission, but the longer range protocols that require ≥ 0.5W are beyond the capability of most coin cells which have a typical internal impedance of 5Ω – 10Ω. A CAP-XX supercapacitor with an Equivalent Series Resistance of ~100mΩ will easily supply the peak power. CAP-XX supercapacitors have very low leakage current, ~1µA/F , so precious power from a harvester or energy from a battery is not wasted. CAP-XX also offer a range of thin prismatic supercapacitors, ideal for sleek and unobtrusive sensors.
For more details see Application Brief Supercapacitors Power Wireless Sensors.