Piezo Transformer

Piezo Transformer Element

Voltage transformation: Electrical energy into mechanical energy and back again.

Features:

	High efficiency, up to 90%
	High operating frequency.
	High boost ratio.
	15W boost up, 30W boost down.
	Standard versions 2W and 3W boost up
	Small size.
	Low electro-magnetic noise.
	Short circuit proof, non flammable.
	High input/output impedance.
	Custom design contact Fuji & Co

The piezoelectric transformer is made from a ceramic material with a high dielectric constant. It is composed of equal sized elements with different polarization. Element A has a standing wave at f/2. Element B is coupled mechanically and it has a standing wave at nX f/2.

The mechanical energy is stored in the two elements. Boost up or down conversion is possible at very high efficiency levels.

The main application for this piezo element combination is energy transformation but it also functions as a boosting element with bandpass characteristics of second order for low-noise chopper circuits. The piezoelectric transformer vibrates at a resonant frequency determined by the element length. The operating frequency F is subject to the velocity of sound c and the length L. F = c/4L with resonance at f/2. The relation between vibration of the piezo ceramic and stress is shown in the diagram. Zero displacement point is the center of the element.


f/2	f
Solid line: Displacement	Dotted line: Stress

Examples of mechanical dimensions and operating frequencies etc..
Type of element	Size of elements			Weight	Resonant Freq.		Capacitance
	L	W	T	10E-3	f/2	f	C1	C2
	mm			kg.	kHz.		pF
Z0.7N2.7X10R-E(C-205)	10	2.7	0.7	0.15	166	332	270	5.0
Z1.2N5.4X20R-E(C-205)	20	5.4	1.2	1.00	83	166	630	9.0
Z1.8N8.5X37R-E(C-205)	37	8.5	1.8	4.50	45	90	1200	11.5
Z2.9N10.8X40R-E(C-205)	40	10.8	2.9	10.00	42	84	1000	22.0
Z2N13X50R-E(C-205)	50	13.0	2.0	10.20	33	66	2300	14.5

The majority of piezoelectric transformers are made to customer specifications. Please send your enquiry to Fuji & Co using the info request form available at the page top.

Other Paramaters available upon request from Fuji & Co

	Power coefficient
	Equivalent mass
	Equivalent stiffness
	Mechanical loss resistance
	Fixed number of equivalent circuits
	Voltage gain
	Output power

Note:	1) Housing to be prepared at customer's end if necessary.
	2)Multi-Layer elements are available as well.