CN104538546B - A kind of radial vibration annular piezoelectric Ceramic Composite transformer - Google Patents
A kind of radial vibration annular piezoelectric Ceramic Composite transformer Download PDFInfo
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- CN104538546B CN104538546B CN201410828737.2A CN201410828737A CN104538546B CN 104538546 B CN104538546 B CN 104538546B CN 201410828737 A CN201410828737 A CN 201410828737A CN 104538546 B CN104538546 B CN 104538546B
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Abstract
The present invention relates to a kind of radial vibration annular piezoelectric Ceramic Composite transformer, it includes piezoelectric ceramics inner ring and piezoelectric ceramics outer shroud, metallic conduction ring is coaxially disposed between piezoelectric ceramics inner ring and piezoelectric ceramics outer shroud, piezoelectric ceramics inner ring, piezoelectric ceramics outer shroud and metallic conduction ring it is upper, lower surface is in the same plane, piezoelectric ceramics inner ring, the D/6 of the height H of piezoelectric ceramics outer shroud and metallic conduction ring≤piezoelectric ceramics outer shroud external diameter, new radial direction vibrating piezoelectric ceramic transformer proposed by the present invention, a metal ring is added between inputting and exporting piezoelectric ceramic devices, improvement transformer radiating can be played, increase the power capacity of transformer, and improve the effect of its electromechanical properties, the piezoelectric ceramics annulus of radial polarised is utilized simultaneously, make polarization and the excitation orientation of piezoelectric ceramics annulus consistent, belong to a kind of mode of oscillation of longitudinal effect, it is similar to Kt mode of oscillations, the electromechanics that piezoelectric ceramic transformer can be improved is excited and conversion efficiency.
Description
Technical field
The invention belongs to composite transformer technical field, more particularly to a kind of radial vibration annular piezoelectric Ceramic Composite transformation
Device.
Background technology
At present, traditional approach that alternating voltage is raised and lowered is to utilize electromagnetic transformers.Electromagnetic transformers it is main by
Iron core and the coil composition around iron core.In electromagnetic transformers, primary and secondary coil is that electromagnetism is realized by magnetic core
Coupling.In some electric power and great-power electronic application technology, large-scale electromagnetic transformers are very effective.However, with
The development of science and technology and the process of electronics miniaturization starts, many applications in electronics industry are required for profile chi
Very little less efficient component, thus it is increasing to the demand of small-sized efficient transformer.Due to its intrinsic reason, for example, lead
Relaxation loss in Kelvin effect loss, the conduction loss of thin wire and the magnetic material of body reduces with the size of transformer
And increase rapidly so that existing electromagnetic transformers are difficult to realize efficient small.At present, electromagnetic transformers have become electricity
The maximum electronic device of road plate upper volume, and become one of biggest obstacle of electronics miniaturization.In addition, electromagnetism transformation
The problems such as intrinsic leakage field phenomenon of device and electromagnetic radiation, can all cause certain pollution for environment, thus also be unfavorable for environmental protection
Requirement.
In order to overcome this problem, the miniaturization of electronic device is realized, there has been proposed the concept of piezoelectric ceramic transformer.
Piezoelectric ceramic transformer is substantially intercoupled by two mechanical parts and the piezoelectric ceramics of circuit part mutually insulated resonates
Device (or piezoelectric ceramic transducer and piezoelectric actuator) is constituted.Piezoelectric ceramic transformer is a kind of new voltage or electricity
Current converter part, its operation principle is different from traditional electromagnetic transformers.In piezoelectric ceramic transformer, between primary and secondary
Coupling be not, by traditional galvanomagnetic-effect, but to be realized by means of mechanical couplings and the piezo-electric effect of piezoelectric
's.The concept of piezoelectric ceramic transformer be by the U.S. Rosen in 1954 propose, but be due to piezoceramic material in itself
Capacity of heat transmission is weaker, therefore the phenomenons such as piezoelectric ceramic transformer overheat usually occurs, so as to influence piezoelectric ceramic transformer
Performance.
In addition, piezo ceramic element is essentially all radial polarization in traditional ring-shaped piezo ceramic transformer, i.e. edge
The short transverse of piezoelectric ceramics annulus；While vibration mould of the vibration of annulus along radial direction, now piezoelectric ceramics annulus
State belongs to the Kp mode of oscillations of horizontal effect.
The content of the invention
Make the pole of piezoelectric ceramics annulus it is an object of the invention to provide a kind of piezoelectric ceramics annulus of utilization radial polarised
Change and excitation orientation be consistent so that the electromechanics for improving piezoelectric ceramic transformer excite and conversion efficiency radial vibration ring
Shape piezoelectric ceramics composite transformer.
To achieve these goals, the technical solution adopted in the present invention includes the piezoelectric ceramics inner ring and pressure being coaxially disposed
Electroceramics outer shroud, is provided with metallic conduction ring, piezoelectric ceramics inner ring, piezoelectricity between piezoelectric ceramics inner ring and piezoelectric ceramics outer shroud
The upper and lower end face of ceramic outer ring and metallic conduction ring in the same plane, piezoelectric ceramics inner ring, piezoelectric ceramics outer shroud and gold
Belong to height H≤piezoelectric ceramics outer shroud outer diameter D/6 of conducting ring.
Above-mentioned metallic conduction ring is any one in aluminium ring, steel loop, copper ring, aluminium alloy or titanium alloy ring, stainless steel ring.
Above-mentioned piezoelectric ceramics outer shroud and piezoelectric ceramics inner ring are the piezoelectric ceramics being made up of emission type piezoelectric energy-conversion material
Ring.
The radial vibration annular piezoelectric Ceramic Composite transformer of the present invention applies when the inner and outer surfaces in piezoelectric ceramics inner ring
One alternating voltage ViWhen, by means of inverse piezoelectric effect, mechanical oscillation will be produced near its resonant frequency, while outside it
The surfaces externally and internally of piezoelectric ceramics outer shroud is exported, due to direct piezoelectric effect, the output electricity of one and input voltage same frequency will be produced
Press signal Vo, so as to realize the conversion of voltage or electric current.Referring to Fig. 1, Fig. 1 is multiple for the radial vibration annular piezoelectric ceramics of the present invention
The electro-mechanical equivalent circuit of transformer is closed, in Fig. 1, the left part of ab lines represents the input piezoelectric ceramics in composite transformer
Ring, i.e. piezoelectric ceramics inner ring, the part between ab lines and cd lines represent metal ring, and the right part of cd lines represents piezoelectric ceramics
The output piezoelectric ceramic ring of transformer, i.e. piezoelectric ceramics outer shroud, therefore, the inside radius a of piezoelectric ceramics inner ring, metallic conduction ring
Inside radius b, the inside radius c of piezoelectric ceramics outer shroud, the height h of the outer radius d of piezoelectric ceramics outer shroud and metallic conduction ring.
After given material and physical dimension, different frequency and not can be just designed using resonance frequency equation (1)
With the piezoelectric ceramic transformer of physical dimension, while can just draw compound change using the voltage transformating ratio equation (2) of transformer
The voltage transformating ratio size of depressor.
The resonance frequency equation of the present invention is formula (1),
Voltage transformating ratio equation is formula (2),
Formula (2)
In formula (1) and (2) equation, the material ginseng of the radial vibration annular piezoelectric ceramic transformer composition material is contained
The mode of oscillation information of number, physical dimension parameter and transformer.
In (1) formula, the π f of ω=2 represent angular frequency, and f represents frequency；
N1Represent that piezoelectric ceramic transformer inputs the electromechanical conversion coefficient of piezoelectric ceramic ring；
C1Represent input direct capacitance.
Z1m=R1m+jX1m, the equivalent mechanical impedance of the inner surface of input piezoelectric ceramic ring is represented, its expression is,
Z2mThe equivalent mechanical impedance of metallic conduction ring inner surface is represented, its expression formula is,
Z3mThe equivalent mechanical impedance of output piezoelectric ceramics ring inner surface is represented, its expression formula is,
R1mRepresent the equivalent mechanical resistance of input piezoelectric ceramics ring inner surface；
X1mRepresent that the equivalent mechanical of input piezoelectric ceramics ring inner surface resists；
ZcRepresent that the reflected resistance of output piezoelectric ceramic ring resists, its expression formula is,
N2Represent that piezoelectric ceramic transformer exports the electromechanical conversion coefficient of piezoelectric ceramic ring；
C2Represent output direct capacitance；Wherein ZcIn R represent the load impedance of composite transformer；
n1And n2Equivalent Transformer in the electro-mechanical equivalent circuit of input and output piezoelectric ceramic ring is represented respectively
Conversion ratio；
In addition, Z11, Z12, Z13；Z21, Z22, Z23And Z31, Z32, Z33Input piezoelectric ceramic ring, metallic conduction ring are represented respectively
And the equivalent mechanical impedance of output piezoelectric ceramic ring, its specific expression formula is,
In addition, it is above-mentioned it is various in,
τ1=Jν(kc)Yν(kd)-Jν(kd)Yν(kc)
b1,b3,b4And b5It is some constants；
K represents wave number；
Jν(kc) Bessel function in special function is represented；
Yν(kd) Nuo Yiman functions are represented；
s-2,v-1Deng expression Lommel function.
The radial vibration annular piezoelectric Ceramic Composite transformer of the present invention has following advantage：
(1) using the piezoelectric ceramics annulus of radial polarised, make the polarization of piezoelectric ceramics annulus and excitation orientation consistent, category
In a kind of mode of oscillation of longitudinal effect, i.e., similar to Kt mode of oscillations, can improve piezoelectric ceramic transformer electromechanics excite and
Conversion efficiency.
(2) new radial direction vibrating piezoelectric ceramic transformer proposed by the present invention, is inputting and is exporting piezoelectric ceramic devices
Between add a circular metal conducting ring, can play improvement transformer radiating, increase transformer power capacity, and
Improve the effect of its electromechanical properties.
(3) by means of the metallic conduction ring in piezoelectric ceramic transformer, such new piezoelectricity can very easily be changed
The working frequency of ceramic transformer.
(4) by changing the physical dimension of piezoelectric ceramic transformer, it is possible to achieve input voltage is raised and lowered.Together
When, it can also realize effective change of composite transformer voltage transformating ratio by transformer physical dimension optimization design, reach
The purpose of voltage change, and which show the Theroy of Engineering Design of such new piezoelectric ceramic transformer and method.By
Working frequency, voltage transformating ratio and the effective mechanical-electric coupling of such composite transformer can be quickly and easily provided in this theory
Coefficient etc..
Brief description of the drawings
Fig. 1 is the electro-mechanical equivalent circuit of the radial vibration annular piezoelectric Ceramic Composite transformer of the present invention.
Fig. 2 is radial vibration annular piezoelectric Ceramic Composite transformer device structure schematic diagram of the invention.
Fig. 3 is Fig. 2 top view.
Embodiment
Technical scheme is further described in conjunction with drawings and Examples, but the present invention is not limited only to
Following implementation situations.
Referring to Fig. 2 and Fig. 3, radial vibration annular piezoelectric Ceramic Composite transformer of the invention is by piezoelectric ceramics inner ring 3
Connected and composed with piezoelectric ceramics outer shroud 1 and metallic conduction ring 2.
The piezoelectric ceramics inner ring 3 of the present embodiment is circular annuli, in its lateral surface high-temperature-resistant epoxy resin binding agent
With the inwall tight bond of metallic conduction ring 2, the lateral surface of metallic conduction ring 2 in the same way with piezoelectric ceramics outer shroud 1
Inwall tight bond, makes conductive metal ring be coaxially disposed with piezoelectric ceramics inner ring 3, piezoelectric ceramics outer shroud 1, and conductive metal ring
Height it is equal with the height of piezoelectric ceramics outer shroud 1, piezoelectric ceramics inner ring 3, i.e., piezoelectric ceramics inner ring 3, piezoelectric ceramics outer shroud 1 with
And the upper and lower end face of metallic conduction ring 2 is in the same plane, the inside radius of piezoelectric ceramics inner ring 3 is set as a, metallic conduction ring 2
Inside radius be b, the inside radius of piezoelectric ceramics outer shroud 1 is c, and the outer radius of piezoelectric ceramics outer shroud 1 is d, piezoelectric ceramics inner ring 3,
The height of piezoelectric ceramics outer shroud 1 and metallic conduction ring 2 is h.
Specific engineering examples are referring to as follows：
Example 1：
A=0.01m, b=0.012m, c=0.02m, d=0.024m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is made of to use PZT-4 materials, and the material of metallic conduction ring 2 is duralumin, R=50 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=39.23kHz, fa=39.74kHz, voltage gain ratio is
M=1.54.
Example 2：
A=0.01m, b=0.012m, c=0.02m, d=0.024m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is made of to use PZT-4 materials, and the material of metallic conduction ring 2 is duralumin, R=200 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=39.46kHz, fa=39.97kHz, voltage gain ratio is
M=1.57.
Example 3：
A=0.01m, b=0.012m, c=0.02m, d=0.026m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is made of to use PZT-4 materials, and the material of metallic conduction ring 2 is duralumin, R=50 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=36.02kHz, fa=36.42kHz, voltage gain ratio is
M=1.69.
Example 4：
A=0.01m, b=0.012m, c=0.02m, d=0.026m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is made of to use PZT-4 materials, and the material of metallic conduction ring 2 is duralumin, R=200 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=36.21kHz, fa=36.61kHz, voltage gain ratio is
M=1.73.
Example 5：
A=0.01m, b=0.013m, c=0.02m, d=0.025m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is stainless steel, R=100 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=41.69kHz, fa=42.01kHz, voltage gain ratio is
M=2.12.
Example 6：
A=0.01m, b=0.013m, c=0.02m, d=0.025m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is stainless steel, R=300 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=41.69kHz, fa=42.09kHz, voltage gain ratio is
M=2.15.
Example 7：
A=0.01m, b=0.013m, c=0.02m, d=0.028m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is stainless steel, R=100 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=38.18kHz, fa=38.49kHz, voltage gain ratio is
M=3.34.
Example 8：
A=0.01m, b=0.013m, c=0.02m, d=0.028m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is stainless steel, R=300 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=38.17kHz, fa=38.48kHz, voltage gain ratio is
M=3.54.
Example 9：
A=0.01m, b=0.018m, c=0.02m, d=0.022m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is copper, R=10 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=35.25kHz, fa=35.68kHz, voltage gain ratio is
M=0.99.
Example 10：
A=0.01m, b=0.013m, c=0.02m, d=0.022m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is copper, R=200 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=37.026kHz, fa=37.544kHz, voltage gain ratio
For M=1.21.
Example 11：
A=0.01m, b=0.013m, c=0.02m, d=0.022m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is titanium alloy, R=50 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=43.763kHz, fa=44.498kHz, voltage gain ratio
For M=1.403.
Example 12：
A=0.015m, b=0.02m, c=0.028m, d=0.03m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is copper, R=50 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=25.774kHz, fa=26.236kHz, voltage gain ratio
For M=1.139.
Example 13：
A=0.015m, b=0.02m, c=0.028m, d=0.03m, h=0.005m, piezoelectric ceramics inner ring 3 and piezoelectricity pottery
Porcelain outer shroud 1 is PZT-4, and the material of metallic conduction ring 2 is titanium alloy, R=50 ohm of load impedance.
Utilize resonance frequency equation formula (1) and voltage gain ratio formula (2), it can be deduced that the present embodiment piezoelectric ceramics is combined
The working frequency fr and antiresonant frequency fa of transformer be respectively：Fr=30.083kHz, fa=30.739kHz, voltage gain ratio
For M=1.30.
The metallic conduction ring 2 of the present invention can be using any commercially available metal material such as aluminium alloy, steel.Metallic conduction
Ring 2, piezoelectric ceramics inner ring 3, the radial thickness of piezoelectric ceramics outer shroud 1 and axial height etc. can be according to actual boosting, step-downs
Need to be adjusted, above-described embodiment is only the implementation situation of part, as long as NM design parameter meets the present invention's
Mentality of designing, belongs to the same design of the present invention, within protection scope of the present invention.
Claims (2)
1. a kind of radial vibration annular piezoelectric Ceramic Composite transformer, it is characterised in that：Including in the piezoelectric ceramics that is coaxially disposed
Ring (3) and piezoelectric ceramics outer shroud (1), metallic conduction ring is provided between piezoelectric ceramics inner ring (3) and piezoelectric ceramics outer shroud (1)
(2), the upper and lower end face of piezoelectric ceramics inner ring (3), piezoelectric ceramics outer shroud (1) and metallic conduction ring (2) in the same plane,
The height H of piezoelectric ceramics inner ring (3), piezoelectric ceramics outer shroud (1) and metallic conduction ring (2)≤piezoelectric ceramics outer shroud (1) external diameter
D/6；
Above-mentioned metallic conduction ring (2) is any one in aluminium ring, steel loop, copper ring, aluminium alloy or titanium alloy ring, stainless steel ring
Kind.
2. radial vibration annular piezoelectric Ceramic Composite transformer according to claim 1, it is characterised in that：The piezoelectricity pottery
Porcelain outer shroud (1) and piezoelectric ceramics inner ring (3) are the piezoelectric ceramic rings being made up of emission type piezoelectric energy-conversion material.
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| CN115790949A (en) * | 2022-09-28 | 2023-03-14 | 武汉地震工程研究院有限公司 | Bolt connection state monitoring method based on wearable intelligent gasket |
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| CN2459632Y (en) * | 2000-11-10 | 2001-11-14 | 周雷 | Ultrasonic wave transducer |
| CN101404318A (en) * | 2008-10-21 | 2009-04-08 | 杭州电子科技大学 | Circular piezoelectric transformer |
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| US6617757B2 (en) * | 2001-11-30 | 2003-09-09 | Face International Corp. | Electro-luminescent backlighting circuit with multilayer piezoelectric transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2459632Y (en) * | 2000-11-10 | 2001-11-14 | 周雷 | Ultrasonic wave transducer |
| CN101404318A (en) * | 2008-10-21 | 2009-04-08 | 杭州电子科技大学 | Circular piezoelectric transformer |
Non-Patent Citations (1)
| Title |
|---|
| 新型径向复合压电超声换能器的研究;王帅军;《中国优秀硕士学位论文全文数据库（电子期刊）工程科技II辑》;20111130;"4.2 径向复合环换能器的径向振动研究"部分、附图4-10 * |
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