SYNCHRONOUS CONTROLLING METHOD FOR INTERFACE AND OPTIMIZATION OF A PIEZOELECTRIC ENERGY HARVESTING DEVICE, CONTROLLING CIRCUIT AND INTERFACE CIRCUIT

摘要

Synchronous controlling method for interface and optimization of a piezoelectric energy harvesting device, controlling circuit and interface circuit » Invention pertains to an electronic circuit that performs the function of interfacing a piezoelectric generator with an electrical load or a component for storing an electrical energy by this generator. It discloses an improved method for controlling the switch of a Synchronous Electric Charge Extractionharvesting circuit, where the stage of discharging the piezoelectric branch toward the output branch is triggered at an instant t1' different from the instant of the maximum piezoelectric voltage V M and/or displacement X. Invention also discloses a method for optimizing, possibly in real- time, the control parameters of a SECE method in function of a mismatch between the actual excitation frequency of the piezoelectric generator and its natural mechanical frequency. This method applies to SECE method such phase shifting only, or with anticipated interruption t2' only, or with both of them. Invention also discloses a device implementing such a synchronization method, enabling a particularly simple, efficient and robust operation.