Single inductor multi-PZTs SECE and electromagnetic voltage multiplier rectifier hybrid interface circuit

This paper proposes a single inductor multi-piezoelectric transducers (PZTs) SECE and electromagnetic voltage multiplier rectifier hybrid interface circuit (MP-SECE-VMR), which harvest energy from multi -input PZTs and electromagnetic generator (EMG). The MP-SECE-VMR adopts a voltage multiplier rectifier circuit, utilizing the diode-connected MOSFET configuration which used as diodes to effectively reduce voltage losses during rectification. Experimental tests confirm that this circuit efficiently extracts energy from PZTs despite differences in their phase relationships. The low input voltage from the EMG is effectively elevated through the voltage multiplier rectifier, enabling simultaneous extraction with the PZTs. The proposed MP-SECE-VMR circuit extracts 1.2 mW of power from two PZTs with open-circuit amplitudes of 9 V and 11 V respectively, as well as from an EMG input with an open-circuit amplitude of 3 V and a frequency of 5 Hz. Furthermore, the proposed circuit effectively enhances output power while expanding the working load range compared to single-source energy extraction.