Solve common problems of piezoelectric ceramic driving power

Question 1: Under the excitation of the piezoelectric ceramic driving power, the maximum drive displacement drops from 45um to 33um. What is the reason?

We need to explain in different situations. If there is no ignition, it means there is no breakdown or short circuit, and there is displacement output. Only the drive displacement of custom piezoelectric hemisphere is reduced in the high-voltage part. It is estimated that the improper use of piezoelectric ceramics, such as applying reverse voltage or depolarization under great pressure, which causes the strain coefficient of piezoelectric ceramics to change, so the displacement is reduced.

Problem two: ordinary high-voltage module power supplies on the market. For example, with a voltage of 1000v and a current of 1mA, can the piezoelectric ceramic drive power ?

Because of the capacitive load, the higher frequency of the piezoelectric ceramic drive power, the smaller impedance, but the capacitance value of the piezoelectric ceramic is relatively small, so its current is also very small. The energy formula of the capacitor = CU*U/2, so the higher the voltage, the more energy the piezoelectric ceramic piezo ceramics tube converts into mechanical energy. The deformation of the piezoelectric ceramic is related to the voltage, and it is useless to measure current. The current of professional piezoelectric ceramics is related to voltage and working frequency. Piezoelectric ceramics have the resonant frequency. At the resonant frequency, the current is estimated to be up to tens of mA. It is enough) to drive piezoelectric ceramics.

Question 3: What is the design idea of the amplifying circuit part of the piezoelectric ceramic drive power supply?

The restriction is to amplify the 0~5V output from the front end to 0~300 and supply the piezoelectric ceramics. In what way is the error magnifying type?

According to the question, here are two ideas:

The first idea is to directly amplify with field effect tube, power supply voltage of DC 450V, power filter, output coupling electrolytic withstand voltage of 600V and above;

The second idea is to use a field effect tube (ordinary power transistor) to directly amplify it and use a 60 times ratio high-efficiency transformer to increase it to 0-300V.

The use of piezoelectric ceramics piezo ceramic disc as a load is mainly an amplifying circuit based on voltage amplification. The noise of the simple circuit will be correspondingly smaller. The specific compensation circuit can be increased or decreased according to actual needs.