Self-powered HP-LED intelligent energy management system with adaptive brightness adjustment

Abstract

The energy harvesting system achieved from one environmental energy channel is facing more and more challenges in meeting the power supply of electronic energy-consuming devices. In this study, a combined photovoltaic (PV) and Thermoelectric Generator (TEG) energy management system is proposed with intelligent self-powered technique for high-power light-emitting diodes (HP-LED) lighting. Both the solar energy and waste heat induced by PV and HP-LED are synchronously converted into electrical energy. Self-powered by this gathered power, an adaptive light intensity control of HP-LED is also realized using the established feedback path between ambient light and HP-LED light. Experimental results show that the supply voltage of the TEG required for startup of the whole system can be decreased as 20.8 mV. Only 10 s is needed to complete the startup process under sufficient light, while 25 s in case of insufficient conditions. This energy management scheme can provide a new technology for future smart home and greenhouse planting.