[1] [1] GONG Lijiao,PAN Qiaosheng,LI Wei,et al.Harvesting vibration energy using two modal vibrations of a folded piezoelectric device［J］.Applied Physics Letters,2015,107(3):033904.

[2] [2] GONG Lijiao,PAN Chengliang,PAN Qiaosheng,et al.Theoretical analysis of dynamic property for piezoelectric cantilever triple-layer benders with large piezoelectric and electromechanical coupling coefficients［J］. Journal of Advanced Dielectrics,2016,6(3):1650017.

[3] [3] OTTMAN G,HOFMANN F H,LESIEUTRE G A.Optimized piezoelectric energy harvesting circuit using step-down converter in discontinuous conduction mode［J］. IEEE Transactions on Power Electronics,2003,18(2):696-703．

[4] [4] TAYLOR G W,BURNS J R,KAMMANN S A,et al.The energy harvesting eel: A small subsurface ocean/river power generator［J］. IEEE Journal of Oceanic Engineering,2001,26(4):539-547．

[5] [5] LEFEUVRE E.Piezoelectric energy harvesting device optimization by synchronous electric charge extraction［J］. Journal of Intelligent Material Systems and Structures,2005,16(10):865-876．

[6] [6] GUYOMAR D,BADEL A,LEFEUVRE E,et al.Toward energy harvesting using active materials and conversion improvement by nonlinear processing［J］. IEEE Transction on Ultrasonics, Ferroelectrics, and Frequency Control,2005,52(4):584-595．

[7] [7] LALLART M,GARBUIO L,PETIT L,et al. Double synchronized switch harvesting (DSSH) :A new energy harvesting scheme for efficient energy extraction［J］. IEEE Transactions on Ultrasonic, Ferroelectrics, and Frequency Control,2008,55(10):2119-2130．

[9] [9] WU Yipeng,BADEL A,FORMOSA F,et al.Piezoelectric vibration energy harvesting by optimized synchronous electric charge extraction［J］. Journal of Intelligent Material Systems and Structures,2013,24(12):1445-1458．

[10] [10] LIANG J,CHUNG S H.Best voltage bias-flipping strategy towards maximum piezoelectric power generation［J］. Journal of Physics Conference,2013,476(1):2025.

[12] [12] WU Yipeng, BADEL A, FORMOSA F,et al. Self-powered optimized synchronous electric charge extraction circuit for piezoelectric energyharvesting［J］. Journal of Intelligent Material Systems and Structures, 2014, 25(17): 2165-2176．

[13] [13] LIANG J. Improved design and analysis of self-powered synchronized switch interface circuit for piezoelectric energy harvesting systems［J］. IEEE Transactions on Industrial Electronics, 2011, 59(4):1950-1960.

[14] [14] LALLART M,WU W,YAN L,et al. Inductorless synchronized switch harvesting using a piezoelectric oscillator［J］. IEEE Transactions on Power Electronics,2020,35(3):2585-2594.

[15] [15] CHEN Zhiyuan,MAN-KAY L,PUI-IN M,et al.Fully integrated Inductor-less flipping-capacitor rectifier for piezoelectric energy harvesting［J］. IEEE Journal of Solid-State Circuits, 2017, 52(12):3168-3180．

[16] [16] LEFEUVRE E,BADEL A,RICHARD C,et al.A comparison between several vibration-powered piezoelectric generators for standalone systems［J］. Sensors & Actuators A Physical, 2006, 126(2):405-416.

[17] [17] OTTMAN G K,HOFMANN H F,BHATT A C,et al.Adaptive piezoelectric energy harvesting circuit for wireless remote power supply［J］. IEEE Transactions on Power Electronics, 2002,17(5):669-676.

[18] [18] WANG Hongtao,SHI Dongyu,ZHENG Shijie.Synchronous charge extractionand voltage inversion(SCEVI) :A new efficient vibration-based energy harvesting scheme［J］. Journal of Vibroengineering,2015,17(2):1037-1050.