The basic working principle and characteristics of monolithic (multi-layer) piezoelectric ceramic transformer

Applications of the positive piezoelectric effect are mainly used in gas igniters such as gas stoves. Ignition systems for gas lighters, etc. The basic working principle is: a spring is compressed by external force, released after pressing to the apex, and the spring force pushes a heavy hammer to hit the piezoelectric ceramic column to produce a high-pressure spark of thousands of volts and ignite the combustible gas.
The application of the inverse piezoelectric effect is mainly used in piezoelectric buzzers, such as music greeting cards, doorbells. Pager. Mobile phone ringing, etc. The basic working principle is: when an alternating electric field is applied to the piezoelectric ceramic plate, the piezoelectric ceramic plate produces a corresponding deformation, that is, vibration, and when the vibration frequency is in the audio band, the corresponding sound will be emitted.
The application of this characteristic and the principle of mechanical resonance is also widely used in the manufacture of resonators, frequency selectors, delay lines, filters and other electronic components.
The basic composition of a piezoelectric ceramic transformer is to combine the application of a piezoelectric buzzer with the application of a piezoelectric igniter to form a piezoelectric harmonic oscillator. At one end of the buzzer (called the drive end) input a sinusoidal alternating voltage consistent with the resonant frequency of the piezoelectric transformer, the piezoelectric resonator generates vibration, conducts to one end of the ignition (called the power generation end), and generates a continuous sine wave voltage, depending on the structural characteristics of the piezoelectric transformer, it can be input low voltage, output high voltage (step-up type), or input high voltage, output low voltage (step-down type). If low-frequency modulation is added to the high-frequency drive voltage through the modem, the signal transmission can be achieved.
Piezoelectric ceramics are brittle materials, in order to ensure their mechanical strength, piezoelectric transformers must have a certain thickness, and the driving voltage of the above transformers is quite limited. For this reason, the monolith (multi-layer) piezoelectric ceramic transformer project came into being.