Abstract
An intelligent solar energy-harvesting system for supplying a long term and stable power is proposed. The system is comprised of a solar panel, a lithium battery, and a control circuit. Hardware, instead of software, is used for charge management of the lithium battery, which improves the reliability and stability of the system. It prefers to use the solar energy whenever the sunshine is sufficient, and the lithium battery is a complementary power supply for conditions, such as overcast, rain, and night. The system adapts a maximum power point tracking (MPPT) circuit to take full advantage of solar energy, and it ensures the lithium battery an extremely long life with an appropriate charging method, which shortens the frequency of the battery charge-discharge cycle. This system can be implemented with small power equipment which is especially suitable for outdoor-based wireless sensor nodes in the Internet of Things (IOT).
Highlights
Wireless sensor network (WSN) is the second largest network after the Internet in the world, and it ranks as the first of the ten emerging technologies
Disposable batteries can be used for power supply in WSN, where researchers have made efforts to save the finite battery on power control by routing algorithm and topology optimization [5,6,7]
This paper focuses on an intelligent solar energyharvesting (ISEH) system based on maximum power point tracking (MPPT) for wireless sensor nodes used in Internet of Things (IOT), which prefers to use the solar power and takes the lithium battery as a supplementary under the condition of inadequate illumination
Summary
Wireless sensor network (WSN) is the second largest network after the Internet in the world, and it ranks as the first of the ten emerging technologies. (2)We combine the advantages of other solar-harvesting systems, which are dominated by solar power using a lithium battery as an energy storage and only when the battery voltage drops below a specific level before charging it. (1)Solar power supply We propose a new solution for supplying the power to the sensor nodes, contrasting with that in [28] and [31] In those two papers, the task of the solar power is only for charging the lithium battery and the super capacitor by a DC/DC converter, which may cause part of the solar energy to be wasted. The switch status is maintained by the RS trigger
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