A Self-Powered Interface Circuit for Simultaneous Piezoelectric and Electromagnetic Energy Extraction

A self-powered circuit for the combination of synchronized electric charge extraction (SECE) and synchronous magnetic flux extraction (SMFE) interfaces (SP-SECE-SMFE) is proposed, which can simultaneously extract energy from piezoelectric transducer (PZT) and electromagnetic transducer (EMT). It reveals that when the energy extraction time of PZT and EMT is consistent, the electromagnetic energy harvested by SP-SECE–SMFE is greatly improved due to the action of the pulse piezoelectric voltage and demonstrates how to use a resistance to adjust the energy extraction time of PZT. Simulation results show that the output power of SP-SECE–SMFE for the hybrid harvesting of piezoelectric and electromagnetic energy is 1.4–2.4 times higher than that of the sum when they are harvested separately under different frequencies and loads. The experimental results show that the maximum output power achieved by SP-SECE–SMFE is 1.7 times higher than that of the sum when are they harvested by the self-powered circuits of SECE and SMFE, respectively, and is 2.2 times higher than that of the half-bridge rectifier circuit. The simulation and experimental results show the superiority of the proposed SP-SECE–SMFE circuit.