CN101872834A - Flexual vibration mode piezoelectric transformer - Google Patents
Flexual vibration mode piezoelectric transformer Download PDFInfo
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- CN101872834A CN101872834A CN 201010183331 CN201010183331A CN101872834A CN 101872834 A CN101872834 A CN 101872834A CN 201010183331 CN201010183331 CN 201010183331 CN 201010183331 A CN201010183331 A CN 201010183331A CN 101872834 A CN101872834 A CN 101872834A
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- 239000000919 ceramic Substances 0.000 claims abstract description 61
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 230000010287 polarization Effects 0.000 claims abstract 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- 238000005452 bending Methods 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 10
- 239000000741 silica gel Substances 0.000 claims description 10
- 229910002027 silica gel Inorganic materials 0.000 claims description 10
- 230000004888 barrier function Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000011888 foil Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 230000001419 dependent effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 38
- 239000011229 interlayer Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 238000003475 lamination Methods 0.000 description 7
- 238000010344 co-firing Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Abstract
The invention provides a flexual vibration mode piezoelectric transformer, which comprises a structure of five stacked layers, wherein the first, second, fourth and fifth layers are piezoelectric ceramic layers; the third layer is a metal layer; the directions of polarization of the first and fifth layers are same along the thickness direction, while the directions of polarization of the second and fourth layers are opposite along the thickness direction; an insulating layer is respectively arranged between the first layer and the second layer and between the fifth layer and the fourth layer; a conducting layer is respectively arranged between the second layer and the third layer and between the third layer and the fourth layer; conducting electrodes are arranged on the upper and lower surfaces of the first and fifth layers; and conducting electrodes are arranged on adjacent surfaces of the second layer and the first layer, and adjacent surfaces of the fourth layer and the fifth layer. On the basis of the working principle and performance characteristics of a vertical vibration mode piezoelectric transformer, the invention provides the flexual vibration mode piezoelectric transformer dependent on a planar electromechanical coupling factor kp; and the flexual vibration mode piezoelectric transformer can obtain low-frequency fundamental wave vibration in a small physical dimension, and installation points are accurate and firm.
Description
Technical field
The invention belongs to piezoelectric transformer structure field, particularly relate to a kind of low frequency piezoelectric transformer.
Background technology
Piezoelectric transformer is the new type electronic transformers that grows up in the later stage seventies in last century, proposed in 1956 by C.A.Rosen the earliest and make, it utilizes inverse piezoelectric effect, and electric energy is converted into mechanical energy, utilize direct piezoelectric effect that mechanical energy is converted into electric energy again, reach the transmission of energy.Compare with traditional wire-wound transformer, piezoelectric transformer has that volume is little, in light weight, high temperature resistant, radiation hardness, high reliability, no short circuit puncture, do not produce good characteristics such as electromagnetic interference, and progressively in electronic systems such as high voltage source, electron rectifier, Switching Power Supply, LCD backlight power supply, be widely used.
At present, in the world to the R﹠D work of high frequency piezoelectric transformer carry out very extensive, with the Rosen type piezoelectric transformer in the high pressure low-power device and the thickness vibration in the low-pressure high-power device and radial vibration type piezoelectric transformer is representative, and the research of low frequency piezoelectric transformer is not caused enough attention as yet.In fact, the low frequency piezoelectric transformer has purposes widely equally, and piezoelectric transformer is applied in the power frequency scope, and the electromagnetic type transformer in many civil electric appliance equipment just can be substituted, can save a large amount of energy and metal material, bring huge economic and social benefit.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide and realize low first-harmonic operating frequency and the bending vibration type piezoelectric transformer of being convenient to produce in batches under a kind of small size.
In order to realize the foregoing invention purpose, the technical scheme of employing is as follows:
A kind of bending vibration type piezoelectric transformer, comprise the five-layer structure that stacks mutually, wherein first, two, four and five layers is piezoceramics layer, the 3rd layer is metal level, ground floor is identical along the polarised direction of thickness direction with layer 5, and the second layer and the 4th layer are opposite along the polarised direction of thickness direction, between the described ground floor and the second layer, be provided with insulating barrier between layer 5 and the 4th layer, and second, three, then be provided with conductive layer between four layers, the upper and lower surface of described ground floor and layer 5 is provided with conductive electrode, the surface that the described second layer and ground floor are adjacent, the 4th layer of surface adjacent with layer 5 is provided with conductive electrode.
In the technique scheme, described first and second, four identical with five layers area, the thickness of ground floor and layer 5 is identical, the second layer is identical with the 4th layer thickness, and the thickness of ground floor and layer 5 and the second layer and the 4th layer is different.
Described the 3rd layer area is bigger than the area of other layer.
Adopt the insulating cement close adhesion between the described ground floor and the second layer and between the 4th layer and the layer 5, and between the second layer and the 3rd layer and adopt the electric silica gel close adhesion between the 3rd layer and the 4th layer.
Described piezoelectric transformer input adds sine and instigates voltage, under the effect of inverse piezoelectric effect, the piezoceramics layer of ground floor and layer 5 is done stretching vibration, and direction of vibration is opposite, drive whole piezoelectric transformer and do flexural vibrations, the output second layer and the 4th lamination electroceramics layer produce output voltage on the electrode under the effect of direct piezoelectric effect; The present invention has proposed to depend on planar electromechanical coupling factor k on the basis that takes into full account extensional vibration type piezoelectric transformer operation principle, operating characteristic
pThe bending vibration type piezoelectric transformer, can obtain low frequency first-harmonic vibration with less geometrical size, and mounting points is accurately firm.
Description of drawings
Fig. 1 is embodiment one structural representation;
Fig. 2 is importation and the output STRUCTURE DECOMPOSITION schematic diagram of Fig. 1;
Fig. 3 is embodiment two structural representations;
Fig. 4 is importation and the output STRUCTURE DECOMPOSITION schematic diagram of Fig. 3.
Embodiment
Embodiment one:
Shown in accompanying drawing 1,2, be bar shaped bending vibration type piezoelectric transformer, comprise two parts of input and output, output is clamped in the importation, and output is clamped sheet metal, adopts the preparation of electrode and lamination co-firing technology.The importation comprises two bar shaped piezoelectric ceramic thin sheets 1 and 5, physical dimension is identical, upper and lower surface covering copper electrode, adopt the preparation of electrode and lamination co-firing technology, their outer surface copper electrode parallel connection, draw an input terminal 6 of piezoelectric transformer, the another one input terminal 7 of piezoelectric transformer is drawn in the parallel connection of inner surface copper electrode.Output comprises two bar shaped piezoelectric ceramic thin sheets 2 and 4 and middle sheet metal interlayer 3, bar shaped piezoelectric ceramic thin sheet 2 is identical with 4 physical dimension, upper and lower surface covering copper electrode, adopt the preparation of electrode and lamination co-firing technology, the length of sheet metal interlayer 3 and width are slightly larger than the bar shaped piezoelectric ceramic thin sheet, draw a lead-out terminal 8 of piezoelectric transformer on the sheet metal interlayer 3, the another one input terminal 9 of piezoelectric transformer is drawn in bar shaped piezoelectric ceramic thin sheet 2 and 4 outer surface copper electrode parallel connection.
Use the insulating cement close adhesion between the bar shaped piezoelectric ceramic thin sheet 1 and 2; Use the electric silica gel close adhesion between bar shaped piezoelectric ceramic thin sheet 2 and the sheet metal interlayer 3; Use the electric silica gel close adhesion between sheet metal interlayer 3 and the bar shaped piezoelectric ceramic thin sheet 4; Use the insulating cement close adhesion between the bar shaped piezoelectric ceramic thin sheet 4 and 5; Bar shaped piezoelectric ceramic thin sheet in importation is identical with width with output bar shaped piezoelectric ceramic thin sheet length, the thickness difference, and length is much larger than width and thickness, and the structure of whole piezoelectric transformer is bar-shaped strip; Vertical arrow in the accompanying drawing is the polarised direction of bar shaped piezoelectric ceramic thin sheet.
Close adhesion between each layer of piezoelectric transformer fixedly mounts in fixed installation of nodal point place or the left end (right-hand member) at input and output electrode leading-out terminal place; During work, add the alternation driving voltage, because the bar shaped piezoelectric ceramic thin sheet polarised direction of importation is identical at input, in parallel on the circuit, driving voltage polarity is opposite, passes through inverse piezoelectric effect, under electric field excitation, when a certain moment, wherein a slice was upheld, another sheet then shortened, and made the bar shaped piezoelectric ceramic thin sheet produce flexural vibrations, thereby drive output bar shaped piezoelectric ceramic thin sheet and also do flexural vibrations, by direct piezoelectric effect, produce electric charge at output terminal electrode, and then produce response voltage.
The first-harmonic operating frequency that can be tried to achieve described piezoelectric transformer by electromechanical analogy theory and energy method is:
Wherein:
L is the length of piezoelectric transformer, l
tBe the thickness of piezoelectric transformer, E is the Young's modulus of piezoelectric ceramic, and ρ is a piezoelectric ceramic density;
In addition, length is that the first-harmonic operating frequency that the bar shaped piezoelectric transformer of l is done length longitudinal extension vibration is:
So:
And l
tSo＜＜l is f
1＜＜f '
1
The frequency that the bar shaped piezoelectric transformer that same size is described is done flexural vibrations likens low many of the frequency of extensional vibration to, so can obtain lower first-harmonic operating frequency with less size.Can find by formula (1), square being inversely proportional to of first-harmonic operating frequency and length, that is to say can be with having increased access to the significantly reduction of piezoelectric transformer first-harmonic operating frequency of less length.It can also be seen that from formula (1), first-harmonic operating frequency and its thickness of piezoelectric transformer are inversely proportional to, and can roughly determine the dimensional parameters of transformer like this in design bar shaped bending vibration type piezoelectric transformer according to the material parameter of required operating frequency and piezoelectric ceramic.
Embodiment two:
As shown in Figure 3 and Figure 4, be disk bending vibration type piezoelectric transformer, comprise two parts of input and output, output is clamped in the importation, and output is clamped metal disk, adopts the preparation of electrode and lamination co-firing technology.
The importation comprises two circular piezoelectric ceramic sheets 1 and 5, thickness is identical, radius is identical, upper and lower surface covering copper electrode, adopt the preparation of electrode and lamination co-firing technology, an input terminal 6 of piezoelectric transformer is drawn in their outer surface copper electrode parallel connection, the another one input terminal 7 of piezoelectric transformer is drawn in the parallel connection of inner surface copper electrode.
Output comprises two circular piezoelectric ceramic sheets 2 and 4 and middle sheet metal interlayer 3, circular piezoelectric ceramic sheet 2 is identical with 4 thickness, radius is identical, upper and lower surface covering copper electrode, adopt the preparation of electrode and lamination co-firing technology, bigger and the circular piezoelectric ceramic sheet of the radius of sheet metal interlayer 3, draw a lead-out terminal 8 of piezoelectric transformer on the sheet metal interlayer 3, the another one input terminal 9 of piezoelectric transformer is drawn in circular piezoelectric ceramic sheet 2 and 4 outer surface copper electrode parallel connection.
Use the insulating cement close adhesion between the circular piezoelectric ceramic sheet 1 and 2; Use the electric silica gel close adhesion between circular piezoelectric ceramic sheet 2 and the sheet metal interlayer 3; Use the electric silica gel close adhesion between sheet metal interlayer 3 and the circular piezoelectric ceramic sheet 4; Use the insulating cement close adhesion between the circular piezoelectric ceramic sheet 4 and 5; Importation circular piezoelectric ceramic sheet is identical with output circular piezoelectric ceramic sheet diameter, the thickness difference, and whole piezoelectric transformer is the sandwich sandwich.
Vertical arrow among the figure is the polarised direction of circular piezoelectric ceramic sheet.
Close adhesion between each layer of piezoelectric transformer, around sheet metal interlayer 3, do the freely-supported installation, during work, add the alternation driving voltage at input, because the circular piezoelectric ceramic sheet polarised direction of importation is identical, in parallel on the circuit, driving voltage polarity is opposite, passes through inverse piezoelectric effect, under electric field excitation, when a certain moment, wherein a slice was upheld, another sheet then shortened, and made the circular piezoelectric ceramic sheet produce flexural vibrations, thereby drive output circular piezoelectric ceramic sheet and also do flexural vibrations, by direct piezoelectric effect, produce electric charge at output terminal electrode, and then produce response voltage.
The minimum first-harmonic operating angle frequency that can be tried to achieve described piezoelectric transformer by electromechanical analogy theory and energy method is:
Wherein, a is the radius of piezoelectric transformer ceramic disks, and h is the thickness of piezoelectric transformer, and ρ is a piezoelectric ceramic density, D
eBe effective bending rigidity of piezoelectric transformer, its expression formula is:
Wherein
Be the open circuit compliance constant of piezoelectric ceramic, k
pIt is planar electromechanical coupling factor.
In addition, radius is that the disk diameter of a is to the first-harmonic operating angle frequency of vibration piezoelectric transformer:
Wherein
Be the short circuit compliance constant of piezoelectric ceramic, ρ is a piezoelectric ceramic density.
By formula (2) as can be known, square being inversely proportional to of the first-harmonic operating frequency of described piezoelectric transformer and radius, know that by formula (3) disk diameter is inversely proportional to the first-harmonic operating frequency of vibration piezoelectric transformer and the first power of radius, the flexural vibrations that disk is described are compared with radial vibration, can obtain the significantly reduction of piezoelectric transformer first-harmonic operating frequency with less radius increment.It can also be seen that from formula (2), the first-harmonic operating frequency of piezoelectric transformer is directly proportional with its thickness, can roughly determine the dimensional parameters of transformer like this in design disk bending vibration type piezoelectric transformer according to the material parameter of required operating frequency and piezoelectric ceramic.
Claims (8)
1. bending vibration type piezoelectric transformer, it is characterized in that comprising the five-layer structure that stacks mutually, wherein first, two, four and five layers is piezoceramics layer, the 3rd layer is metal level, ground floor is identical along the polarised direction of thickness direction with layer 5, and the second layer and the 4th layer are opposite along the polarised direction of thickness direction, between the described ground floor and the second layer, be provided with insulating barrier between layer 5 and the 4th layer, and second, three, then be provided with conductive layer between four layers, the upper and lower surface of described ground floor and layer 5 is provided with conductive electrode, the surface that the described second layer and ground floor are adjacent, the 4th layer of surface adjacent with layer 5 is provided with conductive electrode.
2. bending vibration type piezoelectric transformer according to claim 1, it is characterized in that described first and second, four identical with five layers area, the thickness of ground floor and layer 5 is identical, and the second layer is identical with the 4th layer thickness, and the thickness of ground floor and layer 5 and the second layer and the 4th layer is different.
3. bending vibration type piezoelectric transformer according to claim 1 and 2 is characterized in that described the 3rd layer area is bigger than the area of other layer.
4. bending vibration type piezoelectric transformer according to claim 1, it is characterized in that between the ground floor and the second layer and the 4th layer and layer 5 between adopt the insulating cement close adhesion, and between the second layer and the 3rd layer and adopt the electric silica gel close adhesion between the 3rd layer and the 4th layer.
5. bending vibration type piezoelectric transformer according to claim 1, it is characterized in that being divided into from top to bottom five layers, ground floor and layer 5 are bar shaped piezoelectric ceramic thin sheet oscillator, and physical dimension is identical, polarize along the thickness direction with bar shaped piezoelectric ceramic thin sheet Surface Vertical, polarised direction is identical; The second layer and the 4th layer also are the bar shaped piezoelectric ceramic thin sheet, and physical dimension is identical, along with the thickness direction polarization of bar shaped piezoelectric ceramic thin sheet Surface Vertical, polarised direction is opposite; The length of ground floor, layer 5 and the second layer, the 4th layer of bar shaped piezoelectric ceramic thin sheet is identical with width, the thickness difference; The 3rd layer is the bullion thin slice, and length and width are more bigger than bar shaped piezoelectric ceramic thin sheet; Adopt between the ground floor and the second layer between insulating cement close adhesion, the second layer and the 3rd layer with between the electric silica gel close adhesion, the 3rd layer and the 4th layer with using the insulating cement close adhesion between electric silica gel close adhesion, the 4th layer and the layer 5; Ground floor, the second layer, the 4th layer, layer 5 bar shaped piezoelectric ceramic thin sheet upper and lower surface are coated with copper electrode.
6. bending vibration type piezoelectric transformer according to claim 5, the importation that it is characterized in that ground floor and layer 5 bar shaped piezoelectric ceramic thin sheet composition piezoelectric transformer, their outer surface copper electrode parallel connection, draw an input terminal of piezoelectric transformer, the parallel connection of inner surface copper electrode, draw the another one input terminal of piezoelectric transformer, two input terminals draw the end that node is located at piezoelectric transformer; The second layer, the 4th layer of bar shaped piezoelectric ceramic thin sheet and three-layer metal thin slice are formed the output of piezoelectric transformer, the three-layer metal thin slice is drawn a lead-out terminal of piezoelectric transformer, the outer surface copper electrode parallel connection of the second layer and the 4th layer of bar shaped piezoelectric ceramic thin sheet, draw the another one lead-out terminal of piezoelectric transformer, two lead-out terminals draw the end that node is located at piezoelectric transformer.
7. bending vibration type piezoelectric transformer according to claim 1 is characterized in that being divided into from top to bottom five layers, and ground floor and layer 5 are the circular piezoelectric ceramic sheet, thickness is identical, radius is identical, polarizes along the thickness direction with circular piezoelectric ceramic sheet Surface Vertical, and polarised direction is identical; The second layer and the 4th layer are the circular piezoelectric ceramic sheet also, and thickness is identical, and radius is identical, along with the thickness direction polarization of circular piezoelectric ceramic sheet Surface Vertical, polarised direction is opposite; The radius of ground floor, layer 5 and the second layer, the 4th layer of circular piezoelectric ceramic sheet is identical, the thickness difference; The 3rd layer is the metal foil disk, and radius ratio circular piezoelectric ceramic sheet is bigger; Between the ground floor and the second layer with between insulating cement close adhesion, the second layer and the 3rd layer with between the electric silica gel close adhesion, the 3rd layer and the 4th layer with using the insulating cement close adhesion between electric silica gel close adhesion, the 4th layer and the layer 5; Ground floor, the second layer, the 4th layer, layer 5 circular piezoelectric ceramic sheet upper and lower surface are coated with copper electrode.
8. bending vibration type piezoelectric transformer according to claim 7, the importation that it is characterized in that ground floor and layer 5 circular piezoelectric ceramic sheet composition piezoelectric transformer, ground floor and the parallel connection of layer 5 piezoelectric ceramic piece outer surface copper electrode, draw an input terminal of piezoelectric transformer, the parallel connection of inner surface copper electrode, draw the another one input terminal of piezoelectric transformer, the node of drawing of two input terminals is located at the outer ledge place, and is in relative both sides; The second layer, the 4th layer of circular piezoelectric ceramic sheet and three-layer metal thin slice are formed the output of piezoelectric transformer, the three-layer metal thin slice is drawn a lead-out terminal of piezoelectric transformer, the outer surface copper electrode parallel connection of the second layer and the 4th layer of circular piezoelectric ceramic sheet, draw the another one lead-out terminal of piezoelectric transformer, the node of drawing of two lead-out terminals is located at the outer ledge place, and is in relative both sides.
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| CN201010183331.5A CN101872834B (en) | 2010-05-20 | 2010-05-20 | Flexual vibration mode piezoelectric transformer |
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| CN201010183331.5A CN101872834B (en) | 2010-05-20 | 2010-05-20 | Flexual vibration mode piezoelectric transformer |
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| CN101872834B CN101872834B (en) | 2014-04-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760395A (en) * | 2014-01-02 | 2014-04-30 | 国家电网公司 | Multiple-output electronic voltage transformer for GIS |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1130292A (en) * | 1995-08-04 | 1996-09-04 | 北京伟泰电子电器有限公司 | Multiple layer piezoelectric ceramic transformer and its producing method |
| CN1388596A (en) * | 2001-05-30 | 2003-01-01 | 香港理工大学 | Piezoelectric ceramic step-up transformer in bending vibration mode and its making process |
| CN1700485A (en) * | 2004-05-19 | 2005-11-23 | 中国科学院上海硅酸盐研究所 | Multilayer laminar piezoelectric ceramics step-down auto-transformer and method for making same |
| WO2006046597A1 (en) * | 2004-10-26 | 2006-05-04 | Murata Manufacturing Co., Ltd | Conductive paste and stacked type piezoelectric ceramic component |
| CN101404318A (en) * | 2008-10-21 | 2009-04-08 | 杭州电子科技大学 | Circular piezoelectric transformer |
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2010
- 2010-05-20 CN CN201010183331.5A patent/CN101872834B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1130292A (en) * | 1995-08-04 | 1996-09-04 | 北京伟泰电子电器有限公司 | Multiple layer piezoelectric ceramic transformer and its producing method |
| CN1388596A (en) * | 2001-05-30 | 2003-01-01 | 香港理工大学 | Piezoelectric ceramic step-up transformer in bending vibration mode and its making process |
| CN1700485A (en) * | 2004-05-19 | 2005-11-23 | 中国科学院上海硅酸盐研究所 | Multilayer laminar piezoelectric ceramics step-down auto-transformer and method for making same |
| WO2006046597A1 (en) * | 2004-10-26 | 2006-05-04 | Murata Manufacturing Co., Ltd | Conductive paste and stacked type piezoelectric ceramic component |
| CN101404318A (en) * | 2008-10-21 | 2009-04-08 | 杭州电子科技大学 | Circular piezoelectric transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760395A (en) * | 2014-01-02 | 2014-04-30 | 国家电网公司 | Multiple-output electronic voltage transformer for GIS |
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