CN1700485A - Multilayer laminar piezoelectric ceramics step-down auto-transformer and method for making same - Google Patents
Multilayer laminar piezoelectric ceramics step-down auto-transformer and method for making same Download PDFInfo
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- CN1700485A CN1700485A CN 200410018444 CN200410018444A CN1700485A CN 1700485 A CN1700485 A CN 1700485A CN 200410018444 CN200410018444 CN 200410018444 CN 200410018444 A CN200410018444 A CN 200410018444A CN 1700485 A CN1700485 A CN 1700485A
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Abstract
This invention relates to one multi-layer slice piezoelectricity ceramics coupled reducing transformer and its process method, which is characterized by the following: the transformer is composed of two sets of multi-layer piezoelectricity ceramics as voltage input and the one set of layer piezoelectricity ceramics two between the two sets as output end, wherein, the multi-layer piezoelectricity ceramics adopts rolling film and doctor-blade method through sintering.
Description
Technical field
The present invention relates to a kind of by multilayer chip stepdown piezoelectric ceramic autotransformer and preparation method thereof.
Background technology
Piezoelectric ceramic transformer is to be proposed by Shandong gloomy (Rosen) in 1956, it be utilize that piezoelectric ceramic has just and inverse piezoelectric effect, by the mechanical oscillation of voltage drive ceramic body, make the other end of pottery produce voltage by these mechanical oscillation again, thereby in piezoelectric ceramic body, realize the electronic ceramic device of electric energy-mechanical energy-electric energy conversion.Specifically, electrode and polarization orientation to piezoelectric ceramic body reasonably designs exactly, the piezoelectric ceramic that utilizes inverse piezoelectric effect that input is connected produces mechanical oscillation under the voltage effect, the piezoelectric ceramic that output is connected by direct piezoelectric effect produces voltage again.When the impedance of input and output is unequal, will cause that the voltage of input and output side and electric current are also unequal, thereby the voltage and current conversion in the realization circuit between the input and output side.
Piezoelectric ceramic transformer is at function and obvious in appearance electromagnetic type transformer different from the past, it has that device architecture is simple, volume is little, no electromagnetic pollution, the coiling of no electromagnetic type and characteristics such as not flammable, thereby in some high-tension military and civilian equipment, obtained application, as high-voltage signal source of electronic equipment in the submarine and air cleaner etc.But, the piezoelectric ceramic transformer device must be worked near mechanical resonant frequency, frequency bandwidth is narrow, electronic control circuit is all had relatively high expectations, and the dielectric of piezoelectric and mechanical loss are bigger than magnetic material, be easy to generate fracture under the great machinery vibration, the cost of manufacture height, thereby the nineties, development in the past was slow relatively.In recent years, along with developing rapidly of new and high technologies such as computer, mobile communication, microelectronics-mechanical technique, miniaturization, sheet, integrated demand to electronic device suddenly increase, and piezoelectric ceramic transformer receives much attention again owing to meet these new requirements.Because piezoceramic material preparation technology continues to optimize, material property and mechanical strength improve constantly, special later stage eighties functional ceramic device with the common burning technology (being multi-layer chip capacitor (MMLC) technology) of ceramic powder casting film-forming and pottery/interior electrode be incorporated into prepare the multilayer chip piezoelectric ceramic transformer after, the performance of piezoelectric ceramic transformer significantly improves, volume obviously descends, cost of manufacture declines to a great extent, and the ratio of the input and output by the easy regulation voltage of multilayer ceramic structure and the impedance matching that makes load, electronic circuit integrated, modularization makes FREQUENCY CONTROL be tending towards simple, therefore, piezoelectric ceramic transformer research and patent sharply rise, and become current ceramic material at the very active new device of information application.
The situation that piezoelectric ceramic transformer is used at present mainly is the multilayer chip piezoelectric ceramic transformer to boost, and has been used for LCD, electrostatic precipitator, low-power laser pipe and high voltage source etc.All there are relevant patent in company, domestic Shenzhen Fukang Precision Electronic Ceramic Co., Ltd., Tsing-Hua University and Xi'an Kang Hong Information Technology Co., Ltds etc. such as Japan NEC, Tokin.Japan Tokin company adopts piezoelectric d
31Vibration mode has obtained the multilayer chip piezoelectric ceramic step-down transformer of 140kHz; In addition, Japanese NEC Corporation has carried out the multilayer chip piezoelectric ceramic step-down transformer research that is used for the DC-DC transducer, and this transformer utilizes the longitudinal thickness vibration mode to obtain the step-down transformer of operating frequency for 2MHz,
From the above patent of reporting and paper as can be seen, so far the transformation mode of piezoelectric ceramic step-down transformer has all adopted the fundamental mode that is proposed by Rosen, the pottery that is the input and output side of piezoelectric ceramic separates, produce mechanical oscillation by the whole pottery of voltage drive, at the pottery of the other end because direct piezoelectric effect and output voltage reaches the purpose that reduces output voltage by the impedance that reduces output.This transformation mode is highly effective to piezoelectric ceramic step-up transformer, but the piezoelectric ceramic step-down transformer is come with some shortcomings: the ceramic phase of input and output side separates, and volume is difficult to further miniaturization; Because the electric energy of piezoelectric ceramic transformer transmits by mechanical energy, therefore, the piezoelectric ceramic storing electrical energy of input and output side and mechanical energy should be near equating that this brings difficulty for the structural design of piezoelectric ceramic step-down transformer.The input and output side that aspect practical application, requires transformer not altogether, the step-down transformer of leading or altogether, perhaps the lead complexity of Lian Jieing is unfavorable to using appears in the newspapers.
Summary of the invention
An object of the present invention is to provide a kind of multilayer chip from manifold type piezoelectric ceramic step-down transformer.
Another object of the present invention provides a kind of method for preparing the multilayer chip piezoelectric ceramic transformer.
Multilayer chip piezoelectric ceramic proposed by the invention from the manifold type step-down transformer as shown in Figure 1, it is by as two groups of multilayer piezoelectric ceramic sheets 1 of voltage input be clipped between these two groups of multi-layer ceramic chips one group of multilayer piezoelectric ceramic sheet 2 as output and form.Compare with the Rosen type transformation mode that generally adopts in the past, the step-down mode of the piezoelectric ceramic step-down transformer that the present invention proposes is that the coupling effect by the machinery of piezoelectric ceramic and electricity realizes.Version among the present invention is three groups of multilayer chip piezoelectric ceramic pieces the 1, the 2nd, adopts pottery/interior electrode one to burn altogether, scribbles electrode on each potsherd, is series connection on electricity, is the interdigital electrode form.The polarised direction that a key character of the ceramic step-down transformer of pressure of the present invention is the multilayer chip piezoelectric ceramic piece is consistent.The input and output side that another key character of the present invention is a transformer does not connect altogether.
The column structure (accompanying drawing 2,3) that the multilayer chip piezoelectric ceramic step-down transformer that the present invention proposes is built up by multilayer piezoelectric ceramic sheet square or rectangle or circle.The voltage input end of the piezoelectric ceramic step-down transformer that the present invention proposes is added in two surfaces up and down of multi-layer ceramics transformer respectively, and voltage output end is connected with the multilayer chip piezoelectric ceramic of intermediate course respectively.
Piezoelectric ceramic transformer of the present invention is with the vibration of single order or high-order radial mode, or the length resonance type, or resonance type radially.
The number of plies of respectively organizing multilayer chip piezoelectric ceramic 1 and 2 of the present invention can equate, also can be unequal.
The thickness of respectively organizing multilayer chip piezoelectric ceramic 1 and 2 of the present invention can equate, also can be unequal.
Piezoelectric ceramic piece of the present invention adopts and conventionally in the functional ceramic rolls film and The tape casting preparation, and the thickness of the piezoelectric ceramic piece that it is single is 50～250 microns; Used interior electrode can be in high temperature silver electrode, silver-colored palladium electrode or the platinum electrode a kind of according to the sintering temperature of piezoelectric ceramic piece; Its structure is the interdigital electrode form.
The equivalent polarised direction of multilayer piezoelectric ceramic of the present invention is identical.
Multilayer chip piezoelectric ceramic described in the present invention can be that three groups of multilayer chip piezoelectric ceramic form with bonding agent is bonding behind the sintering respectively from the manifold type step-down transformer, also can be that one is burnt altogether and formed.The input and output side of voltage does not connect altogether.
Multilayer chip piezoelectric ceramic of the present invention is as follows from the preparation method of manifold type step-down transformer:
Prepare the piezoelectric ceramic transformer powder by the conventional preparation method of electronic ceramic earlier, then ceramic powder is mixed according to a certain percentage with the organic adhesive auxiliary agent, obtain the thick film forming ceramic slurry.With rolling film or curtain coating technology are prepared into 50～250 microns by requirement on devices thick film ceramic biscuit.With preparing the biscuit of ceramics film with two kinds of forming methods, electrode size is printed by the requirement of piezoelectric ceramic design of transformer in a surface in biscuit film, the ceramic base film that will be printed on electrode pattern then carries out piezoelectric ceramic transformer structure lamination by designing requirement, hot-forming integrated multi-layer ceramics biscuit.The multi-layer ceramics biscuit is placed on slowly to be warming up in the synthetic furnace keeps after a certain temperature constant temperature getting rid of organic binder bond, and then the synthesis temperature that is warming up to pottery carries out synthetic in advance.At last multi-layer ceramics/interior electrode the block after synthetic is carried out heterogeneous burning altogether, obtain having the chip type piezoelectric ceramic body of structure as shown in Figure 1.Piezoelectric ceramic is polarized by electrode orientation, and the multilayer chip piezoelectric ceramic that obtains is from the manifold type transformer.At the multilayer chip piezoelectric ceramic 1 and 2 shown in Fig. 1, they can distinguish one sintering, polarization, bond them into structure shown in Figure 1 with binding agent then, also can superimposed back three layers of once integrated burning altogether form.
In sum, advantage of the present invention is conspicuous:
1. piezoelectric ceramic step-down transformer of the present invention has from the function that is coupled its step-down by machinery between the piezoelectric ceramic piece and electricity series connection.The maximum characteristics of this structure be piezoelectric ceramic transformer mechanical resonance not for another example Rosen type transformer but play the function of adjusting the phase place between input voltage and the electric current like that as the transmission media of energy.
2. by aforementioned 1 characteristics, the pottery of input and output side is because the machinery series connection, and input impedance and volume can further reduce.
3. piezoelectric ceramic step-down transformer of the present invention, its input and output voltage is not altogether.
4. the structural design of piezoelectric ceramic transformer is more flexible, can regulate the step-down ratio of transformer by application requirements effectively, and obtain high power conversion efficiency.Step-down ratio can reach 0.16, and power conversion efficiency is expected to can be widely used in the electronic products such as mobile communication of new generation, mobile phone up to 98%.
Description of drawings
Fig. 1 multilayer chip piezoelectric ceramic is from the structural representation of the transformer that is coupled.1 is the piezoelectric ceramic that is connected with input terminal voltage among the figure, and 2 is the piezoelectric ceramic that is connected with input terminal voltage.
The rectangular length resonance type of Fig. 2 multilayer chip piezoelectric ceramic is from being coupled transformer.3 is the piezoelectric ceramic that is connected with input terminal voltage in the rectangle piezoelectric ceramic transformer among the figure, and 4 is the piezoelectric ceramic that is connected with input terminal voltage.
Fig. 3 cylindrical radial resonance type multilayer chip piezoelectric ceramic is from being coupled transformer.3 is the piezoelectric ceramic that is connected with input terminal voltage in the cylindrical piezoelectric ceramic transformer among the figure, and 4 is the piezoelectric ceramic that is connected with input terminal voltage.
Embodiment
Further specify substantive distinguishing features of the present invention and obvious improvement below by specific embodiment:
Embodiment 1
It is the power piezoelectric ceramic that piezoelectric ceramic transformer material adopts PZT, its material property is mainly radially electromechanical coupling factor 0.56, dielectric coefficient 1200, dielectric loss 0.4%, mechanical quality factor Q m＞1200, and piezoelectric transformer has high mechanical strength when free state mechanical resonance.The piezoelectric ceramic structure is a rectangle, and structure as shown in Figure 2.Device size: 5 * 20 * 3mm, the input number of plies is 3 layers, and the output number of plies is a layer 9, and its transformation performance is as shown in the table: this transformer is when frequency 90.6kHz, and transformation ratio (γ) is 1/6.6, and power conversion efficiency η is 98%.(the 2nd row sees the following form)
| f(kHz) | ?Vin ?(V) | ?Iin(mA) | ?θ ?(°) | ?Vout ?(V) | ?Iout ?(mA) | ?γ | ?η ?(％) |
| 70.0 | ?40.72 | ?8.92 | ?93 | ?0.53 | ?18.2 | ?1/80 | ?50 |
| 90.6 | ?40.98 | ?12.11 | ?17 | ?6.10 | ?82.8 | ?1/6.6 | ?98 |
| 160.0 | ?40.48 | ?20.0 | ?100 | ?1.24 | ?30.66 | ?1/33 | ?27 |
The subscript in of voltage V and electric current I represents input in the formula
The subscript out of voltage V and electric current I represents output
Embodiment 2
It is the power piezoelectric ceramic that piezoelectric ceramic transformer material adopts PZT, its material property is mainly radially electromechanical coupling factor 0.56, dielectric coefficient 1200, dielectric loss 0.4%, mechanical quality factor Q m＞1200, and piezoelectric transformer has high mechanical strength when free state mechanical resonance.
The piezoelectric ceramic structure is round shape, and structure as shown in Figure 3.Device size: diameter 15mm, height 2.8mm, the input number of plies is 3 layers, and the output number of plies is a layer 9, and its main performance is as shown in the table.
| f(kHz) | ?Vin(V) | ?Iin(A) | θ (°) | ?Vout ?(V) | ?Iout ?(A) | ?γ | ?η ?(％) |
| 165.8 | ?30.37 | ?0.324 | 7 | ?9.57 | ?0.924 | ?0.315 | ?92.4 |
| 165.9 | ?30.36 | ?0.318 | 8 | ?9.42 | ?0.912 | ?0.311 | ?90.0 |
| 166.9 | ?30.45 | ?0.266 | 4 | ?8.85 | ?0.855 | ?0.29 | ?93.8 |
| 168.0 | ?30.51 | ?0.243 | -3 | ?8.52 | ?0.825 | ?0.28 | ?95.1 |
Claims (10)
1. multilayer chip piezoelectric ceramic autocoupling type step-down transformer, it is characterized in that described step-down transformer is made up of three groups of multilayer chip piezoelectric ceramic, upper and lower two groups of chip type piezoelectric potteries (1) are connected with Input voltage terminal, middle one group of chip type piezoelectric pottery (2) is connected with output voltage terminal, and the equivalent polarised direction of described three groups of multilayer chip piezoelectric ceramic is identical.
2. step-down transformer according to claim 2 is characterized in that three groups of multilayer chip piezoelectric ceramic are square, rectangle or circle.
3. step-down transformer according to claim 1, its feature are that also three groups of multilayer chip piezoelectric ceramic adopt superimposed mode to form column structure.
4. according to claim 1,2 or 3 described step-down transformers, it is characterized in that the number of plies of three groups of multilayer chip piezoelectric ceramic is equal or unequal.
5. according to claim 1,2 or 3 described step-down transformers, it is characterized in that the thickness of three groups of multilayer chip piezoelectric ceramic is equal or unequal.
6. according to claim 1,2 or 3 described step-down transformers, it is characterized in that piezoelectric ceramic is with single order or the vibration of high-order radial mode; Or it is the length resonance type, or radially a kind of in the resonance type.
7. according to claim 1,2 or 3 described step-down transformers, it is characterized in that the input and output side of voltage does not connect altogether.
8. a method for preparing the multilayer chip stepdown piezoelectric ceramic autotransformer prepares piezoelectric ceramic powder by the conventional preparation method of electronic ceramic earlier, then ceramic powder is mixed in proportion with the organic adhesive auxiliary agent, obtains the thick film forming ceramic slurry.With rolling film or the curtain coating technology is made the thick film ceramic biscuit, it is characterized in that on a surface of the biscuit of ceramics film of two kinds of forming methods preparation by the requirement printing electrode size of piezoelectric ceramic design of transformer, the ceramic base film that will be printed on electrode pattern then carries out piezoelectric ceramic transformer structure lamination by designing requirement, hot-forming integrated multi-layer ceramics biscuit; The multi-layer ceramics biscuit is placed on to be warming up in the synthetic furnace keeps after a certain temperature constant temperature getting rid of organic binder bond, and then the synthesis temperature that is warming up to pottery carries out synthetic in advance; At last multi-layer ceramics/interior electrode the block after synthetic is carried out heterogeneous burning altogether, obtain having the chip type piezoelectric ceramic body; Again piezoelectric ceramic is polarized by electrode orientation, thereby obtain the multilayer chip piezoelectric ceramic from the manifold type transformer.
9. step-down transformer preparation method according to claim 8, it is characterized in that adopting the biscuit of ceramics thickness of the method preparation of rolling film or curtain coating is the 50-250 micron; Used interior electrode is high temperature silver electrode, silver-colored palladium electrode or platinum electrode; Its structure is the interdigital electrode form.
10. according to Claim 8 or the preparation method of 9 described step-down transformations, it is characterized in that three groups of multilayer chip piezoelectric ceramic or integral sintering, polarization respectively, be formed by stacking with binding agent then, or superimposed back three layers of once integrated burning altogether form.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872834A (en) * | 2010-05-20 | 2010-10-27 | 中山大学 | Flexual vibration mode piezoelectric transformer |
| CN109888086A (en) * | 2019-02-27 | 2019-06-14 | 北京信息科技大学 | A kind of piezoelectric transformer and preparation method thereof based on scissoring vibration |
| CN110534639A (en) * | 2019-08-09 | 2019-12-03 | 上海交通大学 | A kind of nano generator and preparation method thereof |
| CN110803928A (en) * | 2019-12-06 | 2020-02-18 | 电子科技大学 | Preparation method of heterogeneous stacked multilayer ceramic capacitor of antiferroelectric material system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996015560A1 (en) * | 1994-11-10 | 1996-05-23 | Beijing Wide Tech. Electron & Electric Equipment Co. Ltd. | Composite piezoelectric ceramic transformer and manufacture method thereof |
| JPH08153914A (en) * | 1994-11-25 | 1996-06-11 | Philips Japan Ltd | Piezoelectric ceramic transformer |
| CN1217427C (en) * | 2001-05-30 | 2005-08-31 | 香港理工大学 | Piezoelectric ceramic step-up transformer in bending vibration mode and its making process |
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- 2004-05-19 CN CNB2004100184444A patent/CN100539229C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872834A (en) * | 2010-05-20 | 2010-10-27 | 中山大学 | Flexual vibration mode piezoelectric transformer |
| CN101872834B (en) * | 2010-05-20 | 2014-04-02 | 中山大学 | Flexual vibration mode piezoelectric transformer |
| CN109888086A (en) * | 2019-02-27 | 2019-06-14 | 北京信息科技大学 | A kind of piezoelectric transformer and preparation method thereof based on scissoring vibration |
| CN110534639A (en) * | 2019-08-09 | 2019-12-03 | 上海交通大学 | A kind of nano generator and preparation method thereof |
| CN110534639B (en) * | 2019-08-09 | 2021-08-13 | 上海交通大学 | Nano generator and preparation method thereof |
| CN110803928A (en) * | 2019-12-06 | 2020-02-18 | 电子科技大学 | Preparation method of heterogeneous stacked multilayer ceramic capacitor of antiferroelectric material system |
| CN110803928B (en) * | 2019-12-06 | 2022-06-03 | 电子科技大学 | Preparation method of heterogeneous stacked multilayer ceramic capacitor of antiferroelectric material system |
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