J4 ›› 2015, Vol. 42 ›› Issue (6): 118-123.doi: 10.3969/j.issn.1001-2400.2015.06.021

• Original Articles • Previous Articles     Next Articles

Highly efficient interface circuit for vibrational energy harvesting applications

WANG Jingmin;YANG Zheng;YANG Yintang   

  1. (School of Microelectronic, Xidian Univ., Xi'an  710071, China)
  • Received:2014-11-21 Online:2015-12-20 Published:2016-01-25
  • Contact: WANG Jingmin E-mail:15091627824@163.com

Abstract:

An input-powered vibrational energy harvesting interface circuit is presented. By using a bulk-driven comparator, the lowest input voltage amplitude can be reduced to 02 V. When the input voltage amplitude is low enough, the circuit can automatically shut down by adopting the input-powered, thereby avoiding unnecessary energy loss. Based on standard SMIC 018μm 33V CMOS technology, simulation results show that the voltage conversion efficiency can reach up to 89% when the input voltage equals  02V@100Hz with a load resistance of 40kΩ. The energy conversion efficiency can reach up to 80% when the input voltage equals 025V@100Hz with a load resistance of 40kΩ, and the maximum efficiency can be up to 90%. Input voltages with frequencies in the range of 10~500Hz can be rectified.

Key words: vibrational energy harvesting, an input-powered, CMOS active rectifier, active diode, subthreshold region, bulk-driven