The classification and characteristics of piezoelectric tran

　　The classification and characteristics of piezoelectric transformer

　　According to different step-up ratio, the piezoelectric transformer can be divided into step-up transformer and step-down transformer.Can through to the ceramic piece length and thickness of the size of the control to change the way it works, when the input impedance is less than the output impedance, implementation is a booster;When the input impedance is greater than the output impedance, is blood pressure reduction.Step-up transformer work in super audio range, while the step-down transformer work within the scope of the power frequency.

　　According to the different methods of mechanical vibration, can be divided into along the length of the vibration, vibration along the thickness, outline expansion type vibration and bending vibration, etc., P said polarization direction, T said vibration direction, Vin said input voltage, output voltage Vout.According to the different structures, and piezoelectric transformer can be divided into longitudinal and vertical type, horizontal vertical type, horizontal type and ring type, etc.

　　The Rosen piezoelectric transformer for transverse and longitudinal type structure.Compared with the ordinary electromagnetic transformer, piezoelectric transformer has prominent advantages: (1) piezoelectric transformer has a high conversion efficiency.No-load transformer efficiency can reach more than 90%, even in applications, the average conversion efficiency are also more than ten percent higher than the electromagnetic transformer.This advantage to make piezoelectric transformer has a considerable appeal in product development design.

　　(2) good manufacturability, simple structure, easy making, easy batch production, can save non-ferrous metals, no magnetic core.(3) the high step-up ratio.No-load step-up ratio can be as high as more than 800.Adjust the step-up ratio on the transformer appearance is not big.(4) high pressure resistance, not wet, not burning, resistance to electromagnetic interference, so the stability and reliability is better.(5) are not afraid of short circuit, when using, not breakdown.

　　(6) the output waveform.For prolonging the life of the load and working stability, and to improve the energy conversion efficiency of the load.(7) small volume, light weight, conforms to the development of the electronic products miniaturization, lightweight trend.(8) is applicable in the field of electronic integration.In compatible with integrated circuit technology has a good development prospect.