Piezoelectric materials also show the opposite effect, called the converse piezoelectric effect, where the application of an electrical field creates mechanical deformation in the crystal. One is set into motion, by the inverse piezoelectric effect, and the other is. Piezoelectric transformer converter for power use nec. Piezoelectric ceramic transformer tamura corporation. The piezoelectric transformer is made from a ceramic material with a high dielectric constant. Lee, chairman electrical engineering abstract piezoelectric ceramics are characterized as smart materials and have been widely used in the area of actuators and sensors. Hutsel a candidate for the degree of doctor of philosophy and hereby certify that in their opinion it is worthy of acceptance. Understanding piezoelectric transformers in ccfl backlight.
May 18, 2019 download general study on piezoelectric transformer book pdf free download link or read online here in pdf. When a voltage is applied to the top piezoelectric it expands, squeezing the lower piezoelectric and inducing a polarization charge. Mechanical force electricity piezoelectric effect electricity mechanical strain converse of piezoelectric effect 6. Jun 22, 2016 not all piezoelectric materials can be poled. Basic electrical engineering pdf notes bee pdf notes. Multi layer transformer steminc piezoceramic discs. Lead zirconate titanate pzt, exempt application of rohs. Dec 08, 2015 piezoelectric transformers pts are for implementing stepup oscillators for ultralow dc voltage energy harvesting eh applications. Consequently, the output load is variable and due to the output capacitance of the transformer the optimal working point change. Electrical characteristics of high power piezoelectric transformer for 28 w fluorescent lamp. Jones piezoelectric materials below curie temp perovskite unit cell unit electric dipole poling of dipoles. The purpose of a transformer is to change electrical.
Jan 07, 2016 piezo transformer boost the input voltage 5v to several kilovolts that cause glow of of neon bulbs. Pdf general study on piezoelectric transformer researchgate. It converts an electrical input into mechanical energy and subsequently reconverts the mechanical energy back to an electrical output. Transducers a transducer is a device that converts energy from one form to another energy forms can be mechanical, visual, aural, electrical, thermal, chemical, etc. A pt utilizes two interconnected piezoelectric elements.
The piezoelectric transformer to measure high voltage. By replacing conventional lc resonant tanks with piezoelectric transformers, inductorless piezoelectric transformer electronic ballasts have been developed for use in fluorescent lamps. The piezoelectric transformer pt was first realized by c. General study on piezoelectric transformer researchgate. Then, the most important features and limitations for the design of the transformer and an estimation of its range of application are discussed. In this work comsol is utilized to obtain the mason lumped parameter model for a. The piezoelectric transformer is a combination of piezoelectric actuators as the primary side and piezoelectric transducers as the secondary side, both of which work in longitudinal or transverse. Simulation of piezoelectric transformers with comsol t. Oct 24, 2016 through the use of piezoelectric transformers pts, it is possible to generate ionic winds in ambient air with significantly smaller voltages 7 v than otherwise possible. Comparing magnetic and piezoelectric transformer approaches in ccfl applications cold cathode fluorescent lamps ccfls are commonly used as a backlight source for color liquid crystal displays lcds used in notebook computers and portable electronic devices. Pdf finite element analysis on piezoelectric ring transformer. With a piezoelectric transformer formed of a ferroelectric element which generates a high voltage in a secondary section upon application of an ac voltage to a primary section, ground electrodes are attached to upper and lower surfaces of the secondary section of the piezoelectric transformer via a dielectric sheet for insulation in tight contact therewith such that a dielectric barrier. Pdf this study describes a multilayer piezoelectric voltage and power transformer that has one direction. Linear piezoelectricity is the combined effect of the linear electrical behavior of the material.
Actuators free fulltext piezoelectric transformers. The principle of piezoelectric transformer is different from electromagnetic transformers. Piezoelectric transformer pzt is a device which transforms voltage by piezoelectric effect and converse piezoelectric effect of ceramic material. Piezoelectric transformer characterization and application. Multitopology piezoelectric transformer controller 8tssop 0 to 70 piezoelectric sensor datasheets context search. Simulation of piezoelectric transformers with comsol. A leadfree piezoelectric transformer in radial vibration. Download fulltext pdf download fulltext pdf piezoelectric transformers for ultralow voltage energy harvesting applications article pdf available in procedia engineering 87. Piezoelectric converters for dcdc and acdc applications.
The deformation of the central face of the input portion is constrained by the bonded output layer or constraint layer. Piezoelectric transformers of bar, plate, disc, and ring shapes are analytically modeled by the immittance method for onedimensional vibration modes as a function of dimensions, material. Piezoelectric transformers for space applications mrs. With the piezoelectric transformer, the primary and secondaryside electrodes are installed on a piezoelectric ceramic material. Theory of piezoelectric materials and their applications in. A project report on mobile charger using piezoelectric effect submitted by. They behave differently and have a number of advantages, e. A piezoelectric transformer is a device that transforms an ac voltage or current by piezoelectric vibration. Pdf piezoelectric transformer pzt is a device which transforms voltage by piezoelectric effect and converse. With appropriate design and circuitry, it is possible to step up and step down the voltages between the input and output sections of the piezoelectric. In our previous study, a piezoelectric transformer pt using the third symmetric. Input current and output voltage with the driving frequency of piezoelectric transformer.
In response to market demand tamura will provide various types and forms of ultrasonic transducers in all shapes and sizes from low to high frequencies. An introduction to piezoelectricity, piezo transformers and associated power electronics circuits. Piezoelectric transformers and drivers of thereof youtube. The piezoelectric transformer is a product that utilizes both of the two properties. Piezoelectric transformers and dcdc piezo converters piezoelectric transformers. A multilayer piezoelectric transformer is provided using a composite vibration modes for stepup voltage conversion applications. Oscillation is achieved by coupling a common source stage made up of n channel jfets with a piezoelectric transformer acting like a high gain notch filter. Us7821762b2 piezoelectric transformer type ionizer and. Thomsen dtu elektro, technical university of denmark, orsteds plads, building 349, dk2800 kgs. Design of piezoelectric transformer for dcdc converter.
Pts are therefore an interesting field of research. Conventional piezoelectric transformers for generating high voltage are of a switching frequency of several tens of khz and are therefore not within the frequency range of the poweruse. Piezoelectric transformers for ultralow voltage energy harvesting. Design and analysis of piezoelectric transformer converters by chihyi lin fred c.
The principle operation of a piezoelectric transformer pt is a combined function of actuators and sensors so that. Equivalent circuit of the piezoelectric transformer determined using the admittance circle. Piezoelectric transformers for space applications pdf. Design of piezoelectric transformer for dcdc converter with. Electrical characteristics of high power piezoelectric. Element b is coupled mechanically and it has a standing wave at nx f2. Dielectric actuator, high conversion ratio interface, piezoelectric transformer, half bridge converter, microrobotic application. The basic concept of the transformer, shown in fig. Michael bradley2 presented at comsol conference, boston, october 35 2012 1 solid state ceramics, williamsport, pa 17701 usa 2 qortek, williamsport, pa 17701 usa excerpt from the proceedings of the 2012 comsol conference in boston. For publications related to the subject matter of this vid. A transducer can be anything that converts one form of energy to another. Each manufacturer has a unique, and usually proprietary.
Equivalent circuit of the piezoelectric transformer. The mechanical energy is stored in the two elements. The word piezoelectricity means electricity resulting from pressure and latent heat. Piezo transformer boost the input voltage 5v to several kilovolts that cause glow of of neon bulbs. Finite element analysis on piezoelectric ring transformer. In this paper, the piezoelectric instrument transformer is presented to measure voltage in distribution networks.
Power and thermal characteristics of piezoelectric transformers safakcan tuncdemir1 w. Piezoelectric converters for dcdc and acdc applications a. Compared with an electromagnetic transformer, it has the following favorable characteristics. Ppt piezoelectric materials powerpoint presentation free. The piezoelectric transformer has an analogous operating mechanism. Users may download and print one copy of any publication from the public portal for the purpose of private study or. It generally consists of a mechanical transformer, a piezoelectric transducer, and an interface circuit. Piezoelectric transformers for space applications v01. It is composed of equal sized elements with different polarization. The physical and piezoelectric properties of pnwpmnpzt ceramics are listed in table 2. Characterization of a piezoelectric transformer plasma source presented by brian t.
It is well known that power density of piezoelectric transformers is limited by mechanical stress. When a moderate voltage is applied to a piezoelectric transformer pt, discharges can form on the edges of the crystal that produce measureable ionic winds. Basic electrical engineering pdf free download links. Dec 12, 2015 piezoelectric transformers are a thing, have you used one. Modeling and analysis of multilayer piezoelectric transformer. The principle operation of a piezoelectric transformer pt is a. Lowprofile cold cathode fluorescent lamp ccfl backlight solutions are commonly used in these applications. An ac voltage at the resonance frequency of the transformer is applied to the primary electrode to excite me. Characterization of a piezoelectric transformer plasma source. Read online general study on piezoelectric transformer book pdf free download link book now. A nanoscale piezoelectric voltage transformer is illustrated in fig 1c. Theory of piezoelectric materials and their applications in civil engineering by antoine ledoux submitted to the department of civil and environmental engineering on may, 2011 in partial fulfillment of the requirements for the degree of master of engineering in civil and environmental engineering 1 abstract.
This invention relates to a method and apparatus for driving a piezoelectric transformer and particularly relates to the method and apparatus for driving the piezoelectric transformer as a high voltage power source for a copier and a printer utilizing an electrophotographic system. These lamps require a high ac voltage for ignition and operation. A piezoelectric transformer is a voltage transformation device that uses direct and inverse piezoelectric effects. Piezoelectric materials crystals which acquire a charge when compressed, twisted or distorted and vice versa quartz silk enamel barium titanatebatio3 7. A high voltage piezoelectric transformer for active interrogation presented by andrew benwell, a candidate for the degree of doctor of philosophy of electrical engineering, and hereby certify that in their opinion it is worthy of acceptance. The power density of piezoelectric transformers calculated by the stress boundary can reach 330 wcm 3. The principle operation of a piezoelectric transformer is a combined function of actuators and sensors so that energy can be transformed from electrical form to electrical form via mechanical vibration. Piezoelectricity is the electric charge that accumulates in certain solid materials such as crystals, certain ceramics, and biological matter such as bone, dna and various proteins in response to applied mechanical stress.
Pdf high power universal piezoelectric transformer researchgate. As can be seen, the high values of the dielectric constant, mechanical quality factor q m and low temperature coefficient of resonant frequency tcf r obtained from the material indicate that the composition ceramics can be used for high power transformer application. Pdf piezoelectric transformers for ultralow voltage. Piezoelectric products, piezo actuators, piezo motors, piezo ceramics, piezo transducers, atila fea software, piezoelectricity. General study on piezoelectric transformer 1kwok k. Ultrasonic waves have been used for many industrial and business purposes in the past, now it is being applied to home appliances. Download piezoelectric transformers for space applications book pdf free download link or read online here in pdf. Piezoelectric transformer is a combination of piezoelectric actuator and transducer. Understanding piezoelectric transformers in ccfl backlight applications market forces are reducing both the size and energy consumption requirements of portable devices such as pdas, internet appliances, and subnotebook computers. Dielectric actuator, high conversion ratio interface, piezoelectric transformer, halfbridge converter, microrobotic application. In a piezoelectric transformer converter for power use that includes a switching circuit that generates alternating current. The piezoelectric transformer field effect transistor. Moreover, the pt can replace the magnetic transformer in many applications such.
Schematics of the proposed highpower, universal piezoelectric transformer. The initial concept of a piezoelectric ceramic transformer was proposed by charles a. This produced electric voltage can be measured using voltage measuring instruments to calculate the value of stress or strain. The piezoelectric energy harvester has been deemed as a potential solution for power shortage and battery maintenance problems in wsns due to its scalability and simplicity.
Based on this, the tutorial describes vital elements of the piezo transformer such as electrical equivalent circuit, soft switching and the longitudinal mode transformer. Download general study on piezoelectric transformer book pdf free download link or read online here in pdf. Especially, the piezoelectric transformers are becoming more and more usable in electrical devices owing to several advantages such as small. Contained within this report is a comprehensive design and analysis of a new product. Us5923542a method and apparatus for driving piezoelectric. Suggested for use where a low input voltage piezo transformer is required. The coupling effect between the electrical and mechanical energy is used to produce voltage stepup or stepdown, galvanic isolation, balanced inputoutput voltage etc. Piezoelectric transducer working, circuit, advantages. High voltage pts piezoelectric materials and devices. However, no piezoelectric transformer has ever reached such a high power density in practice. All books are in clear copy here, and all files are secure so dont worry about it. These devices are manufactured using piezoelectric materials that are driven at resonance. Piezoelectric nonresonant transformer to measure high.
Oscillation is achieved by coupling a common source stage made up of n channel jfets with a piezoelectric tran. This conversion is referred to as the direct piezoelectric effect. A piezoelectric transducer also known as a piezoelectric sensor is a device that uses the piezoelectric effect to measure changes in acceleration, pressure, strain, temperature or force by converting this energy into an electrical charge. Read online piezoelectric transformers for space applications book pdf free download link book now. On a system well dimensioned, it can go as low as 5vrms with output power 4w. Apr 01, 2016 the characteristics of the piezoelectric transformers are well known when the load impedance is a pure resistor.
Piezoelectric transformers are an alternative to wire wound magnetic transformers. General study on piezoelectric transformer ieee conference. Author links open overlay panel juhyun yoo a kwanghee yoon a sangmo. The design will utilize zigbee wireless transmission for communication. Multilayer piezo transformer 55 khz 4w smmtf55p4s80. Piezoelectric transformers pts are solidstate devices that transform electrical energy into electrical energy by means of a mechanical vibration.
Transformtor operates at a particular resonance frequency. Design of interleaved multilayer rosen type piezoelectric transformer. Design and construction of a multifunction piezoelectric transformer. Comparing magnetic and piezoelectric transformer approaches. Highvoltage piezoelectric transformers have been adopted by power electronic engineers and researchers worldwide. Power enhancement of piezoelectric transformers by adding. The characterization and modeling of piezoelectric transformers are studied and developed for use in electronic ballasts. An input portion polarized to deform radially is bonded to an output portion via a bondline or constraint layer. However, when piezoelectric transformers are used in acdc or dcdc converters, there are nonlinear electronic circuits connected before and after the transformer. Piezoelectric transformers are a thing, have you used one. Frontiers impingement cooling using the ionic wind. Transformers tutorial this piezo tutorial provides a basic introduction to piezoelectric transformers.
A free powerpoint ppt presentation displayed as a flash slide show on id. Design and analysis of piezoelectric transformer converters. It is derived from the greek word piezein, which means to squeeze or. Structure of 100 w highefficiency piezoelectric transformer. A piezoelectric disk generates a voltage when deformed change in shape is greatly exaggerated 7. New insight into piezoelectric energy harvesting with. Piezoelectric materials exhibit the property of piezoelectricity, according to which on the application of any type of mechanical stress or strain leads to the generation of an electric voltage proportional to the applied stress. A leadfree piezoelectric transformer in radial vibration modes. Red piezoelectric crystals blue sensor housing the black electrode is where the charge from the crystals accumulates before it is conditioned by the yellow, microcircuit.
250 842 1411 342 1261 1090 960 1346 1215 869 1127 1240 416 1255 576 997 590 110 232 734 961 846 387 286 527 1586 275 23 552 205 532 304 231 1224 566 1271 717 778 1316 305 1055 168 1148 808 663 929 493 184 1492 397