Research on interface circuits of multiple piezoelectric generators
HUO Xin-xin1,2, CHU Jin-kui1,2,HAN Bing-feng1,2, YAO Fei1,2
1. Key Laboratory for Dalian University of Technology Precision & Non-traditional Machining of
Ministry of Education, Dalian University of Technology, Dalian 116023, China|2.Key Laboratory for Micro/Nano
Technology and System of Liaoning Province, Dalian University of Technology, Dalian 116023, China
To explore the output power performance of multiple piezoelectric generators which are connected in parallel mode and work cooperatively, four kinds of parallel-connection interface circuits for multiple piezoelectric generators were proposed based on the standard circuit and the synchronized switch harvesting on inductor (SSHI) circuit. The output power in these four kinds of interface circuits was theoretically derived and the influence on it by the phase difference among the exciting forces was studied. The results show that for piezoelectric generators connected in parallel mode, if the piezoelectric generators are rectified after parallel connection and link with standard/ SSHI circuit, the phase difference between exciting forces has effect on the output power, and the output power is decided by the phase difference,the interface circuit and the excitation frequency. If piezoelectric generators are connected in parallel after rectifier bridges and link with standard/SSHI circuit, the phase difference has no effect on the output power and in this situation, the output power is decided by both the interface circuit and the excitation frequency. Compared among the four kinds of interface circuits, a system consists of multiple piezoelectric generators which are connected in parallel after rectifier bridges and link with SSHI circuit has higher output power and wider frequency bandwidth, so its comprehensive results are more acceptable．
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