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The Class-D power amplifier (PA) is widely used to drive the primary coil of wireless power transfer (WPT) systems. Due to coupling and loading variations, the PA is required to adjust the transmission power quickly, precisely, and efficiently. In this brief, a switching-frequency-modulation-based Sigma-Delta ( $\Sigma\Delta$) modulator is proposed for driving the PA with minimal hardware overhead...
In this paper, enhanced acoustoelectric transduction in an acoustic energy harvester using dual Helmholtz resonators has been reported. The harvester uses a pair of cavities mechanically coupled with a compliant perforated plate to enhance the acoustic coupling between the cavity and the plate. The experimental results show that the volume optimization of the second cavity can significantly increase...
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