Piezoelectric power generation interface circuits

Abstract

New power conversion circuits are presented that interface to a piezoelectric power generator. Measured results are presented for a synchronous rectifier with voltage doubler connected to the piezoelectric membrane. The power efficiency is 88% and the output power is 2.5 /spl mu/W with a 100 k/spl Omega/, 100 nF load. An improved circuit based on the synchronous rectifier achieves 1.4 V, 20 /spl mu/W and more than 90% efficiency.