Current sensor-free transfer window alignment with combined energy harvesting and current measurement capabilities

An energy harvesting circuit has been developed to power an IoT network which measures energy consumption at the outlet level. This work integrates the rectification and down-stream voltage regulation stages, allowing the capacitor voltage to be used to measure current. An experimental prototype is developed to demonstrate the proposed algorithm. • A new energy harvesting algorithm is developed for current transformers. • Enables use of ultra low-power IoT sensor nodes. • Transfer Window Alignment is implemented direct without current sensing. • Primary current is estimated, and energy is harvested simultaneously.