Bias-Flip Technique for Frequency Tuning of Piezo-Electric Energy Harvesting Devices

Journal of Low Power Electronics and Applications

Jianying Zhao²  Yogesh Ramadass¹  Jeffrey Lang³  Jianguo Ma² 

[1] Texas Instruments, Inc., 12500 TI Blvd., Dallas, TX 75243, USA; E-Mail:;Tianjin University, School of Electronic Information Engineering, 92 Weijin Rd, Nankai Dist., Tianjin, China, E-Mails:;Massachusetts Institute of Technology, EECS Dept, 77 Mass Ave, Cambridge, MA 02139, USA; E-Mail:

关键词: energy harvesting;    bias-flip;    piezo-electric;   

DOI  :  10.3390/jlpea3020194

来源: mdpi

【 摘 要 】

Devices that harvest electrical energy from mechanical vibrations have the problem that the frequency of the source vibration is often not matched to the resonant frequency of the energy harvesting device. Manufacturing tolerances make it difficult to match the Energy Harvesting Device (EHD) resonant frequency to the source vibration frequency, and the source vibration frequency may vary with time. Previous work has recognized that it is possible to tune the resonant frequency of an EHD using a tunable, reactive impedance at the output of the device. The present paper develops the theory of electrical tuning, and proposes the Bias-Flip (BF) technique, to implement this tunable, reactive impedance.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.