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The PE energy harvesting circuit converts AC voltage V BA from the PE transducer into a DC output voltage V rect. Therefore, maintaining efficient PE energy harvesting over the PE transducer’s wide operating range is still a challenge for circuit design.įigure 1 shows the PE energy harvesting system, which consists of the PE transducer, circuit, and a load. The harvesting circuit’s objective is to achieve efficient energy extraction from the PE transducer while minimizing the power dissipation of the circuit. Various PE energy harvesting circuits to improve efficiency have been reviewed. Many researchers have focused on the first two points, rectification and maximum power tracking, due to a PE transducer’s source impedance characteristics.
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The general purpose of the PE energy harvesting circuit requires: (1) rectification, (2) maximum power tracking, and (3) output voltage regulation. It is very suitable for small-scale energy harvesting due to the high power density and easy scalability of the PE transducer. Piezoelectric (PE) energy harvesting has attracted immense interest due to its potential for applications such as the Internet of Things (IoT) and implant devices. A power conversion efficiency of 83.2% is achieved. The experimental results show that, compared with the full-bridge (FB) circuit, the amount of power harvested from a PE cantilever and the Voltage Range of Interest (VRI) of the proposed circuit is increased by 2.9 times and by 4.4 times, respectively. Eleven simple discrete components prototyped the circuit. The circuit is self-powered and has the capability of starting without the help of an external battery. The hybrid SSHI circuit using the two resonant loops enables the proposed circuit’s output voltage to no longer be limited.
#DIODE BRIDGE RECTIFIER CALCULATOR SERIES#
One resonant loop is typically used for the parallel SSHI scheme, and the other for the series SSHI scheme. It uses the two resonant loops for flipping the capacitor voltage and energy transfer in each half cycle. The proposed circuit addresses this problem. A typical SSHI circuit cannot transfer the power from a PE cantilever into the load when the rectified voltage is higher than a certain voltage. This paper presents a piezoelectric (PE) energy harvesting circuit, which integrates a Synchronized Switch Harvesting on Inductor (SSHI) circuit and a diode bridge rectifier.