Jump phenomena of current in piezoelectricceramic vibrators under high power conditions

摘要

In order to investigate the origin of current-jump phenomenon when piezoelectric-ceramic vibrators were driven at high power levels, the influence of higher harmonics due to the ferroelectric nonlinearity on the jump phenomenon was studied. Using the equivalent circuit equation including a higher harmonic term, the theoretical calculation was performed. Since the calculated values of current under jump phenomena agree well with the measured ones, the jump phenomenon is due to the higher harmonics caused by ferroelectric nonlinearity. It was also found that the strain jump phenomenon appears when the jump of current occurs around the resonance frequency.