“…Nonlinear converters are employed with piezoelectric transducers to increase the harvested energy by implementing a virtual impedance that matches the complex conjugate impedance of the piezoelectric transducer [19,26]. Nonlinear converters are employed with piezoelectric transducers to increase the harvested energy by implementing a virtual impedance that matches the complex conjugate impedance of the piezoelectric transducer [19,26].…”