PowerPool: Multi-source Ambient Energy harvesting

Energy has become the bottleneck issue restricting the development of IoT. Ambient energy harvesting is a promising mechanism to resolve the contradiction between continuous perception and energy costs of IoT devices. Multi-source Ambient energy harvesting could further increase the availability and stability of energy supply. However, when multiple energy sources work together, it is a challenge to address issues as current backflow and low efficiency due to the difference in energy level.We establish the energy pool model to achieve multi-source energy harvesting fusion. We build an unified access interface for different energy sources, where MOSTEF is used to replace the diode for achieving unidirectional conduction and preventing current backflow. We implement the prototype and evaluate it with different energy sources such as wind, light, radio frequency and piezoelectric energy. The experiment results suggest that energy transmission loss of the interface is less than one percent of total energy.