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1 Journal of Power Technologies

1 2016

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Optimization analysis of interface circuits in piezoelectric energy harvesting systems

Pang S., Li W., Kan J.

Journal of Power Technologies

2016

Vol. 96, nr 1

1--7

Piezoelectric energy harvesting systems have different interface circuits, including the standard interfacercuit, synchronized switch harvesting on inductor circuit, and synchronized charge extraction circuit. The comparison of an interface circuit with a different interface circuit to determine which is better has been widely investigated. However, for a certain interface circuit, how the parameters can be optimized to increase efficiency in energy collection has rarely been investigated. To improve the energy harvesting efficiency of a certain interface circuit in a fast and convenient manner, three interface circuits, which are the circuits to be optimized, were mainly introduced. A simulation method to optimize the circuit for energy collection was used. The simulation method was implemented in Pspice and includes parametric, sensitivity, and optimization analyses. The output power of parallel synchronized switch harvesting on the inductor circuit can be increased from 20.13 mW to 25.23 mW, and the output power of the synchronized charge extraction circuit can be increased from 11.98 mW to 19.85 mW. Results show that the energy collection performance can be improved by using the optimization simulation method.