Abstract
Energy is available all around us in various forms such as solar, thermal, piezoelectric, vibrational energies, etc. These forms of energy can be converted into electric energy that can power wireless sensors. Energy consumption of wireless sensor is a bottleneck in various applications that require long life time. This paper presents a detailed power consumption analysis of ZigBee based wireless pulsating sensors, design of an energy harvesting system to cater its power requirements and optimizing the sleep interval to enhance its life time. A low voltage buck-boost converter is used to harvest power from solar panel and power the wireless node. A rechargeable battery is used as a backup power source. The surplus power from the solar panel is used to charge the battery. Super capacitors are provided to meet the peak current requirements of wireless nodes. The circuit was designed, fabricated and tested with an RTD based temperature sensor. Data is logged at different cyclic sleep interval from which the optimized sleep time for minimum average current consumption is evaluated.
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