CN102130290A - Isolated Rosen type piezoelectric ceramic transformer - Google Patents
Isolated Rosen type piezoelectric ceramic transformer Download PDFInfo
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- CN102130290A CN102130290A CN2010106067399A CN201010606739A CN102130290A CN 102130290 A CN102130290 A CN 102130290A CN 2010106067399 A CN2010106067399 A CN 2010106067399A CN 201010606739 A CN201010606739 A CN 201010606739A CN 102130290 A CN102130290 A CN 102130290A
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Abstract
The invention discloses an isolated Rosen type piezoelectric ceramic transformer. A rectangular piezoelectric of the transformer is divided into three rectangular areas from the left to the right along the length direction, wherein the first area is an input driving area, the upper surface and the lower surface of the first area is coated with electrodes polarizing along a thickness direction, and the polarizing directions is from the top down or from the bottom up; the second area is an isolation area; and the third area is a power generation area, the left end of the power generation area is coated with a girdle-shaped low-position electrode along four outer surfaces of the piezoelectric, the right end of the power generation area is coated with a high-position electrode, and the low-position electrode and the high-position electrode are separated; and thus, a high isolation effect between input and output is achieved.
Description
Technical field
The present invention relates to a kind of piezoelectric ceramic transformer, particularly a kind of Rosen type piezoelectric ceramic transformer with isolation.
Background technology
The principle of piezoelectric ceramic transformer is to utilize the piezoelectric property of piezoelectric to realize conversion between mechanical energy and the electric energy.According to the difference of vibration mode, piezoelectric ceramic transformer can be divided into longitudinal vibration mode, thickness vibration mode, radial vibration mode and beam mode transformer etc.
As far back as the 1950's, U.S. Luo Sen people such as (Rosen) has just proposed Rosen type piezoelectric ceramic transformer.Rosen type piezoelectric ceramic transformer is the typical case of transverse and longitudinal vibration mode, and it operates mainly under the resonance condition.Common Rosen type piezoelectric transformer is made up of left and right sides two parts, is referred to as " drive part " and " power generation part " respectively.Upper and lower two end faces of drive part are all had silver electrode, and they polarize along thickness direction, can be used as voltage input end: the electrode that power generation part right-hand member head is had is polarization along its length then, can be used as voltage output end.When alternating voltage is added to the input of piezoelectric transformer, by piezoelectric effect, can make piezoelectric transformer generation stretching vibration along its length, be converted to mechanical energy with the electric energy that will import; Power generation part then by direct piezoelectric effect, makes the mechanical energy of stretching vibration along its length be converted to electric energy, thereby produces voltage output Vout.Because the length of piezoelectric transformer is greater than thickness, so its input is a Low ESR, output is a high impedance, and output voltage is step-up transformer greater than input voltage.General defeated several alternating voltages that lie prostrate tens volts of people just can obtain the high pressure output more than several kilovolts.
This traditional Rosen type piezoelectric ceramic transformer as shown in Figure 1, output needs a shared electrode with input, can't accomplish the isolation of importing and exporting.
And piezoelectric ceramic transformer is used for some power source products, and is applied in many signal transmission systems such as industrial test system, medical treatment electronic equipment, power equipment, and it is essential having certain isolation strength.Particularly need isolate the signal that on-site transfer is come at the transmitter of the external environment work of complexity, reach signal transmission conversion after, guarantee operating personnel's safety and on-the-spot normal operation.
Summary of the invention
Have in view of that, the purpose of this invention is to provide a kind of Rosen type piezoelectric ceramic transformer of isolation, this piezoelectric ceramic transformer can be realized the input of transformer and the height isolation of output.
For solving the problems of the technologies described above, the invention provides a kind of Rosen type piezoelectric ceramic transformer of isolation, this piezoelectric transformer is for being divided into rectangular piezoelectric body successively three rectangle regions along its length from left to right: first district drives the district for input, down two surface-coated electrode arranged thereon,, along thickness direction polarization, polarised direction from top to bottom or from bottom to top; Second district is an isolated area; The 3rd district is the generating district, along four outer surface linings of piezoelectrics ring-band shape low position electrode, the right-hand member head is coated with high potential electrode, described low position electrode and described high-order electrode separation in the generating district at generating district left end, wherein high potential electrode polarizes along its length, and polarised direction from top to bottom or from bottom to top; Low position electrode does not polarize.Thereby realize the high isolation effect between input and the output.
As the improvement of such scheme, drive the left end head lining feedback electrode of distinguishing in described input, feedback electrode polarizes along its length; Upper/lower electrode and described left end head that described input drives the district leave dividing strip, and described drive electrode and described feedback electrode are separated.Thereby realize the self-excitation of circuit, realize that simultaneously feedback electrode and input drive the isolation in district.
As the improvement of such scheme, described isolated area, dividing strip be surface-coated insulating material.This insulating material comprises polyurethane adhesive, epoxide-resin glue, organic silica gel, phenol glue, polyester glue, polyester-imide glue, polyimides glue.
As the further improvement of such scheme, the zone of not covering electrode in the generating district is coated with insulating polymeric material, thereby realizes and air insulated, reaches better isolation effect.
The present invention also provides a kind of multi-layer piezoelectric transformer that comprises the Rosen type piezoelectric ceramic transformer of above-mentioned isolation, comprise at least two individual layer transformers, form by each individual layer transformer laminated together, wherein alternately laminated between the drive part in each individual layer transformer for the internal chiasma finger shaped layers.
Multi-layer piezoelectric transformer by individual layer transformer composition, driving force, the load-carrying ability of output and the mechanical strength of piezoelectric transformer are significantly improved, number of plies design in the practical application can determine that the number of plies is many more according to applied environment, and it is strong more to export load-carrying ability.
The present invention is provided with isolated area at piezoelectric ceramic body, and at isolated area surface-coated insulating cement, makes piezoelectrics and air isolated, has realized the input of Rosen type piezoelectric ceramic transformer and the height isolation of output like this.
In addition, the present invention is arranged on feedback electrode the end face that drives the district dexterously, thereby does not influence input and the isolation of exporting fully, and feedback electrode is arranged on and drives the termination, district is best choice.
Description of drawings
Fig. 1 is the stereogram of existing common Rosen type piezoelectric ceramic transformer;
The Rosen type piezoelectric ceramic transformer structure vertical view that Fig. 2 isolates for the preferred embodiment of the invention;
The Rosen type piezoelectric ceramic transformer structure side view that Fig. 3 isolates for the preferred embodiment of the invention;
To be Fig. 3 be the profile of Fig. 3 along the B-B face along the profile of A-A face, Fig. 3-2 to Fig. 3-1;
The Rosen type piezoelectric ceramic transformer that Fig. 4 isolates for the embodiment of the invention encapsulates profile entirely;
The Rosen type piezoelectric ceramic transformer isolated area that Fig. 5 isolates for the embodiment of the invention is coated with the envelope profile.
Specific embodiment
Fig. 2～Fig. 5 is this programme preferred embodiment.Piezoelectrics length is represented with L; Driving district's upper/lower electrode fills grid shading, generating district low position electrode and is filled to that black, the high potential electrode in generating district are filled to the horizontal stripe shading, feedback electrode is filled to the slanted bar shading.
Fig. 2, Fig. 3 overlook and schematic side view for the structure of the Rosen type piezoelectric ceramic transformer of isolation of the present invention, in Fig. 2, piezoelectric transformer is for being divided into rectangular piezoelectric body 9 successively three rectangle regions along its length from left to right: first district drives the district for input, down two surface-coated drive electrode 3 (seeing Fig. 3-1) arranged thereon,, along thickness direction polarization, polarised direction from top to bottom or from bottom to top; Second district is an isolated area 4; The 3rd district is generating district, and along four outer surfaces linings of piezoelectrics ring-band shape low position electrode, 5 (seeing Fig. 3-2), the right-hand member head is coated with high potential electrode 7 in the generating district, low position electrode 5 separates with high potential electrode 7, does not contact at generating district left end; High potential electrode 7 polarizes along its length, polarised direction from top to bottom or from bottom to top all can, low position electrode 5 does not polarize; Thereby realize the electric isolating effect between input and the output.
The piezoelectric ceramic transformer that is used for auto-excitation type need be provided with feedback electrode, and generating district and isolated area are added the isolation strength that feedback electrode will inevitably influence transformer greatly on the piezoelectric ceramic cuboid.Drive the left end head lining feedback electrode of distinguishing 1 in input, feedback electrode polarizes along its length; Input drives the upper/lower electrode in district and the dividing strip 2 that the left end head leaves a segment distance, drive electrode 3 is separated with feedback electrode 1, thereby realize the self-excitation of circuit, realizes that simultaneously feedback electrode and input drive the isolation in district.
In theory, the dielectric strength of piezoelectric ceramic body is generally greater than 4000V/mm, and the about 1000V/mm of the dielectric strength of dry air according to the requirement of isolating, can be provided with the length of different isolated areas, and isolated area length is big more, and dielectric strength is big more.The insulating cement if piezoelectrics isolated area surface is not covered, then the dielectric strength of air has just determined the isolation strength of whole piezoelectric transformer, can't realize the height isolation of transformer like this, therefore the isolated area of piezoelectric ceramic body surface needs coating one deck insulating cement that piezoelectrics and air are completely cut off, the isolation strength of whole piezoelectric transformer just depends on the dielectric strength of piezoelectric ceramic body and insulating cement, so just can realize that the height of transformer is isolated.
Can be coated with insulator 8 (see figure 5)s around on the isolated area surface; This insulator can be selected materials such as polyurethane adhesive, epoxide-resin glue, organic silica gel, phenol glue, polyester glue, polyester-imide glue or polyimides glue for use.Perhaps in dividing strip 2 and generating district, there is not the zone of covering electrodes can be coated with insulator yet.In addition, also can be coated with insulating barrier 10 (see figure 4)s of above-mentioned material on the surface of whole transformer, all electrodes all pick out by lead-in wire, to increase the better overall isolation effect.
The length that indicates feedback electrode among Fig. 2 is L1.The drive electrode that input drives the district is changeless to the distance of left end head and the length sum L2+L3 of drive electrode, be 1/2 of transformer total length L, polarised direction P is shown in arrow among Fig. 3, from top to bottom, it is the transfer process of finishing electromechanical energy that the input drive part mainly acts on, when input applies a low-voltage driving signal of telecommunication, when the resonance frequency of its driving frequency and transformer is identical, resonance takes place, and the transformer mechanical deformation produces vibration displacement.The length of isolated area is L4, because the piezoelectric ceramics body itself is an insulator, air also is nonconducting, thereby can realize importing the isolation that drives district and generating district.The width of generating district's low position electrode is that the distance of L5, low position electrode and right-hand member head is L6, the length that is positioned at the high potential electrode in generating district of right-hand member head is L7, isolated area length is changeless with generating section length sum L4+L5+L6, it also is 1/2 of transformer total length L, polarised direction P is shown in arrow among Fig. 3, from left to right, polarize along the piezoelectrics length direction, the main effect in generating district is to propagate standing wave and finish high pressure conversion, in of the continuous accumulation of right-hand member head, will produce a high voltage signal output along with electric charge.
As long as guarantee that drive electrode does not link to each other with feedback electrode, L2 is the smaller the better in theory, but considers prepared to the distance L 2 of left end head for drive electrode, and more suitable distance of need selection is generally 1mm.
Isolated area length L 4 can change with insulation request, but increase that can not be unlimited, this need consider from the overall dimension of transformer and the piezoelectric property of transformer.
The distance L 6 of generating district's low position electrode and right-hand member head changes and changes along with isolated area length L 4, but both sums are changeless, are 1/2 of transformer total length L.
Feedback electrode length L 1, generating district's low position electrode length L 7 are very little, are tens microns.
Generating district low position electrode length L 5 is less, generally about 1mm, and wide on the one hand meeting influence the output performance of piezoelectric transformer, this electrode also should not design wide for very expensive silver palladium alloy on the other hand.
Obtain higher isolation strength one deck insulating cement that need be covered on the surface of isolated area or whole transformer, the selection of insulating cement and the requirement of thickness are as the criterion not influence the transformer piezoelectric property.The lining of insulating cement can be selected technologies such as spraying, coating, dipping, pouring.
According to structure as shown in Figures 2 and 3, can make a isolation voltage requirement at the Rosen of 3000V type piezoelectric transformer, this transformer overall dimension: length and width, thick 28mm, 5mm, the 3mm of being respectively, it is to be made for 17 layers by the individual layer piezoelectrics stack of same thickness, all silver-palladium inner electrode is arranged between every layer, make only stone piezoelectrics by sintering, at only stone piezoelectrics surface and end lining top electrode, make a complete transformer then by technologies such as existing silver ink firing, polarization.Figure 4 shows that and select elasticity good insulation glue that the transformer that the mode by embedding will pick out lead-in wire is packaged into an integral body; Shown in Figure 5ly then only be coated with the envelope insulating cement in isolated area.
The above-mentioned transformer related parameter choosing that makes is: drive electrode is 1mm to the distance L 2 of left end head; Input drive electrode length L 3 is 13mm, polarizes along thickness direction; The length L 4 of isolated area is 1.5mm; Generating district low position electrode length L 5 is 1mm; Generating section length L4 is 11.5mm, polarization along its length.
Through test, the operating voltage of this transformer is 5V, output voltage 300-500V; Resonance frequency is 120KHz; Power is 2W; Isolation voltage satisfies the requirement that isolation voltage is 3000V fully greater than 5000V.
For driving force, the load-carrying ability of output and the mechanical strength that makes piezoelectric transformer significantly improves, can be by the multi-layer piezoelectric transformer of individual layer transformer composition, at least comprise two individual layer transformers, stacked by existing process layer by each individual layer transformer and to form, it is alternately laminated wherein to carry out the internal chiasma finger shaped layers by existing technology between the drive part in each individual layer transformer.Number of plies design in the practical application can determine that the number of plies is many more according to applied environment, and it is strong more to export load-carrying ability.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim institute restricted portion.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the Rosen type piezoelectric ceramic transformer of an isolation, it is characterized in that being divided into three rectangle regions from left to right successively along transformer rectangular piezoelectric body length direction: first district drives the district for input, down two surface-coated electrode arranged thereon,, along thickness direction polarization, polarised direction from top to bottom or from bottom to top; Second district is an isolated area; The 3rd district is the generating district, along four outer surface linings of piezoelectrics ring-band shape low position electrode, the right-hand member head is coated with high potential electrode, described low position electrode and described high-order electrode separation in the generating district at generating district left end, wherein high potential electrode polarizes along its length, and polarised direction from top to bottom or from bottom to top; Low position electrode does not polarize.
2. the Rosen type piezoelectric ceramic transformer of isolation according to claim 1 is characterized in that: drive the left end head lining feedback electrode in district in described input, feedback electrode polarizes along its length; Upper/lower electrode and described left end head that described input drives the district leave dividing strip, and described drive electrode and described feedback electrode are separated.
3. the Rosen type piezoelectric ceramic transformer of isolation according to claim 1 and 2 is characterized in that: described isolated area and isolation strip be surface-coated insulating material.
4. the Rosen type piezoelectric ceramic transformer of isolation according to claim 3, it is characterized in that: described insulating material is polyurethane adhesive or epoxide-resin glue or organic silica gel or phenol glue or polyester glue or polyester-imide glue or polyimides glue.
5. the Rosen type piezoelectric ceramic transformer of isolation according to claim 1 is characterized in that: described generating district is the zone of the covering electrodes insulating material that all is covered not.
6. the Rosen type piezoelectric ceramic transformer of isolation according to claim 5, it is characterized in that: described insulating material is polyurethane adhesive or epoxide-resin glue or organic silica gel or phenol glue or polyester glue or polyester-imide glue or polyimides glue.
7. the Rosen type piezoelectric ceramic transformer of isolation according to claim 1 and 2 is characterized in that: be coated with insulating cement on the surface of whole transformer, and described all electrodes pick out by lead-in wire all.
8. the Rosen type piezoelectric ceramic transformer of isolation according to claim 1 and 2 is characterized in that: the length that described input drives the district is half of described piezoelectrics length.
9. the Rosen type piezoelectric ceramic transformer of isolation according to claim 1 is characterized in that: described piezoelectrics are fired by at least two individual layer piezoelectrics stacks and are formed.
10. multi-layer piezoelectric transformer that comprises the Rosen type piezoelectric ceramic transformer of claim 1 or 2 described isolation, it is characterized in that: comprise at least two individual layer transformers, form by each individual layer transformer laminated together, wherein alternately laminated between the drive part in each individual layer transformer for the internal chiasma finger shaped layers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106067399A CN102130290A (en) | 2010-12-27 | 2010-12-27 | Isolated Rosen type piezoelectric ceramic transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106067399A CN102130290A (en) | 2010-12-27 | 2010-12-27 | Isolated Rosen type piezoelectric ceramic transformer |
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| CN102130290A true CN102130290A (en) | 2011-07-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115148892A (en) * | 2022-05-25 | 2022-10-04 | 珠海多创科技有限公司 | Signal isolator and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1325584A (en) * | 1969-10-18 | 1973-08-01 | Sumitomo Electric Industries | Piezoelectric ceramic transformers |
| CN1125352A (en) * | 1994-07-18 | 1996-06-26 | 株式会社东金 | Piezzo transformer and voltage transforming device using same |
| CN1392617A (en) * | 2001-06-19 | 2003-01-22 | 株式会社村田制作所 | Method for producing piezoelectric transformer and device for producing piezoelectric transformer |
| US20040174098A1 (en) * | 2003-03-04 | 2004-09-09 | Yu-Hsiang Hsu | Optimized piezoelectric transformer apparatus with maximum energy conversion efficiency |
-
2010
- 2010-12-27 CN CN2010106067399A patent/CN102130290A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1325584A (en) * | 1969-10-18 | 1973-08-01 | Sumitomo Electric Industries | Piezoelectric ceramic transformers |
| CN1125352A (en) * | 1994-07-18 | 1996-06-26 | 株式会社东金 | Piezzo transformer and voltage transforming device using same |
| CN1392617A (en) * | 2001-06-19 | 2003-01-22 | 株式会社村田制作所 | Method for producing piezoelectric transformer and device for producing piezoelectric transformer |
| US20040174098A1 (en) * | 2003-03-04 | 2004-09-09 | Yu-Hsiang Hsu | Optimized piezoelectric transformer apparatus with maximum energy conversion efficiency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115148892A (en) * | 2022-05-25 | 2022-10-04 | 珠海多创科技有限公司 | Signal isolator and preparation method thereof |
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Application publication date: 20110720 |