Capacity increasing application of piezoelectric ceramic capacitor

Capacity increasing application of piezoelectric ceramic capacitor

  • CN 108,109,844 B
  • Filed: 11/25/2017
  • Issued: 08/31/2021
  • Est. Priority Date: 11/25/2016
  • Status: Active Grant
First Claim
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1. The capacity-increasing application of a piezoelectric ceramic capacitor, wherein the piezoelectric ceramic capacitor comprises a sheet-shaped, annular, cylindrical shell-shaped or focusing bowl-shaped piezoelectric ceramic body and electrode layers on two opposite surfaces of the piezoelectric ceramic body, the static dielectric constant of the piezoelectric ceramic body is 60000, the thickness of the piezoelectric ceramic body is 0.01-5mm, the static capacitance value of the capacitor is C0, the piezoelectric ceramic capacitor is used in a circuit for loading a voltage U between the two electrode layers, and the capacity-increasing application is characterized in that:

  • a blank area with the width less than 10mm is reserved on the periphery of the piezoelectric ceramic body on the electrode layer on one side of the piezoelectric ceramic capacitor, and the poling treatment is carried out by adopting the poling voltage of 500-10000V/mm;

    the loading voltage U is not higher than half of the polarization voltage of the alternating current, and the loading voltage U is 10-20000V of alternating current;

    the capacitor has a capacitance value C which increases with an increase in the applied voltage U, and is used as a capacitor having a capacity-increasing effect with an increase in voltage;

    the difference between the capacitance value C and the initial capacitance value C0 is in positive-variable corresponding relation with the voltage, the capacitance value is increased gradually, and the capacitance value C is increased to 2-4 times of the initial capacitance value C0 at most.

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