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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.

An Optimal Kinematics Calculation Method for a Multi-DOF Manipulator

Zheng Y., Liu J., Kan J.

Przegląd Elektrotechniczny

2012

R. 88, nr 7b

320--323

Because of the complexity and time-consumption kinematics calculation, it is difficult to get solutions that can meet the requirements of kinematics calculation and real-time motion control simultaneously for the multi-degree of freedom (DOF) manipulator by a single processor. Based on the coordinate rotation digital computer (CORDIC) algorithm, the high-speed inverse kinematics calculation for a six-DOF manipulator is implemented in a co-processor and the motion control strategy is implemented in a host-processor. A pipelined architecture is adopted to reduce the time-consumption of the inverse kinematics calculation. The architecture of the parallel processing method is presented particularly. The experiment shows that time-consumption of the kinematics calculation is greatly reduced and the calculation results meet the requirement on the control accuracy.

Bazując na algorytmie CORDIC (coordinate rotation digital computer) zaproponowano metodę obliczania kinematyki manipulatora o sześciu stopniach swobody. Zastosowano architekturę potokową i równoległe przetwarzanie danych. Osiągnięto znaczące skrócenie czasu obliczeń.