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This paper presents the design and implementation of a series-SSHI-phi interface circuit for piezoelectric energy harvesting with improved operating frequency range. Adopting a nonlinear switching architecture, complex impedance matching can be achieved at off-resonance by introducing delay into switching timing. A buck-boost converter following the rectifier is used for resistive-load emulation and...
This paper presents two interface circuit designs that improve the piezoelectric energy harvesting performance at off-resonance. Complex impedance matching at different frequencies is achieved by introducing delay into the conventional switching methods. The proposed techniques can also be used in other applications, such as electromagnetic energy harvesting. The system is analyzed using equivalent...
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