Design of Pyroelectric Protection Circuit for Piezoelectric Transducer
This study explores the mechanism of the pyroelectric effect in piezoelectric materials and analyzes the polarization charge generated by temperature changes in the piezoelectric ceramic material employed in a piezoelectric transducer.It was observed that the resulting pyrovoltage heightened the output signal amplitude of the piezoelectric transducer,thereby compromising the output's validity.Consequently,two solutions to mitigate the pyroelectric is-sue were investigated.Following a comparative analysis,an ESD protection circuit incorporating an enhanced diode clamp was devised.This circuit integrated a pyroelectric release loop to discharge the charge,effectively eliminating the impact of pyroelectric voltage on the transmission and reception of useful signals.Finally,the feasibility of the design scheme was verified by comparative experiments.
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