Optimized Power Management Circuit for RF Energy Harvesting System

For many years, RF wireless harvesting systems have been investigated, but only a few of RF sources have been able to generate sufficient energy that can be used as feasible source for ultra low power applications. However, most of power management systems are not efficient at ultra low power sources like RF sources due to power consumption in control circuitry. The solution for this issue can be either power consumption reduction which is limited by physical constraints or another energy source in order to harvest enough power able to deliver it to the load. This Paper presents an optimized power management circuit to improve the efficiency of DC-DC converter, this is accomplished using particle swarm optimization technique, where the converter efficiency is used as the fitness function and inductor and on-time are chosen as optimized parameters. This design improves the DC-DC converter efficiency and the efficiency of optimized power management circuit by 9.25% comparing with conventional power management circuits over a wide range of input power, allowing harvesting more power from RF sources and delivering it to load. This approach is not limited to ultra low power applications; it can easily be extended in portable applications to extend the battery life.