Abstract:

Energy scavenging technology could provide an efficient  method to solve a wireless sensor nodes’ power supply problem in a smart grid. The energy conditional unit’s performance directly affected the quality and efficiency of the energy scavenging system. The model of the typical energy conditioning unit was established, the formula of conditional circuit average power was deduced and the factors which would influence efficiency of the circuit and switch control strategy were analyzed. A new type of conditioning circuit topology design was proposed, which could improve the waveform of output voltage through inductance freewheeling. An impact factor β was defined and the feasibility of the advanced structure was certificated. The selection principle of the components parameter was proposed and the results of simulation and experiments both indicated that the improved topologies could overcome  shortcomings such as output waveform, and could improve the work efficiency of an energy scavenging system.

Key words: smart monitoring, energy scavenging device, conditioning unit, impact factor, topology optimization