CN102130291A - Piezoelectric ceramic wafer type isolating signal transformer and manufacturing method thereof - Google Patents
Piezoelectric ceramic wafer type isolating signal transformer and manufacturing method thereof Download PDFInfo
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- CN102130291A CN102130291A CN2010106077263A CN201010607726A CN102130291A CN 102130291 A CN102130291 A CN 102130291A CN 2010106077263 A CN2010106077263 A CN 2010106077263A CN 201010607726 A CN201010607726 A CN 201010607726A CN 102130291 A CN102130291 A CN 102130291A
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Abstract
The invention discloses a piezoelectric ceramic wafer type isolating signal transformer and a manufacturing method thereof. The transformer comprises a piezoelectric ceramic body, an input part, an output part and an isolating part, wherein the piezoelectric ceramic body is of a wafer type; the isolating part extends to another circular surface from one circular surface of the body in the thickness direction, so that the piezoelectric ceramic body is divided into two parts, namely the input part and the output part; a first isolating strip which is covered by an electrode is formed between the input part and the output part; and the input part and the output part are provided with covered electrodes on the upper surface and the lower surface of the body. The signal transformer has a voltage isolating function, high conversion efficiency, a simple structure and a small size.
Description
Technical field
The present invention relates to a kind of transformer, particularly a kind of piezoelectric ceramic disk type isolation signals transformer and preparation method who is applied to the electronics industry such as signal transmission of small-power electric power electronics.
Background technology
Since 20th century the eighties, the research of piezoelectric ceramic transformer and application have obtained very big breakthrough, because piezoelectric transformer has the advantage of following four aspects with respect to electromagnetic transformers: height boosts, the small size of high-energy-density and sheet typeization.Piezoelectric transformer is a kind of transformer that all is different from traditional concept from the material structure to the operation principle, it is to be prepared from through series of process such as high temperature sintering, high voltage polarizations with ferroelectric material, this transformer have sheet type volume little, in light weight, can not puncture, not be afraid of distinguishing features such as short circuit, step-up ratio height, the Miniature Power Unit of making of piezoelectric transformer has not only overcome traditional transformer and has been operated in existing problem under the high pressure conditions, and can adapt to well that electronic equipment is small-sized, the needs of lightness, slimming.
Present piezoelectric transformer is the three end autotransformers of do not have isolating substantially, i.e. input and output voltage altogether, the piezoelectric transformer that boosts of Rosen type as shown in Figure 1, shown in Figure 2 is the voltage-dropping type piezoelectric transformer that vibrates along the thickness direction.Its shortcoming is: input of the transformer of three present end self coupling types and output common ground, there not be the voltage isolation function of input and output, and then comparatively very dangerous in the transmission course of complexity at operational environment, be not suitable for Signal Spacing and get the field; Present piezoelectric transformer mostly is the transformer of length or amplitude direction vibration, less than the conversion efficiency of the transformer of radial vibration.
Simultaneously, in many signal transmission systems such as industrial test system, medical treatment electronic equipment, power equipment, realize that Signal Spacing is the requirement of safety operation, as the isolation between input signal and output signal.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.
Present isolation technology is mostly to use the magnetoelectricity isolation technology substantially or photoelectricity is isolated.The magnetoelectricity isolating transformer substantially all is to use wire-wound transformer, needs to realize input and the isolation of exporting with two wire-wound magnetic core transformers, and the shortcoming of its existence has: (1) two core transformers volume that combines is bigger, does not meet the requirement of sheet type development; (2) transformer kinking technology, the winding of transformer is many, and it is higher that transformer is made complicated cost; (3) the wire-wound magnetic core transformer punctures easily, the easy short circuit of winding department, and isolation effect is bad; (4) having used two wire-wound transformers to isolate has descended the efficiency of transmission of its whole signal.Optocoupler then the life-span shorter, and easy light decay, and cost is higher.
Summary of the invention
Have in view of that, the purpose of this invention is to provide a kind of piezoelectric ceramic disk type isolation signals transformer, this signal transformer has the function of voltage isolation, and conversion efficiency is higher simultaneously; And simple in structure, volume is littler.
For solving the problems of the technologies described above, the invention provides a kind of piezoelectric ceramic disk type isolation signals transformer, comprise piezoelectric ceramic idiosome, importation, output, it is characterized in that: also comprise isolated part; Described piezoelectric ceramic idiosome is the disk type, described isolated part extends to another disc from one of them disc of idiosome along thickness direction, the piezoelectric ceramic idiosome is divided into two parts of described input and output, forms first isolation strip of not covering electrode between described input and the output; Described importation and output are provided with covering electrodes at the idiosome upper and lower surface.Thereby realize the electric isolating effect between input and the output.
As the improvement of said method, also comprise feedback fraction; Described feedback fraction is arranged in one of them electrode surface of importation, and feedback fraction is provided with covering electrodes, is provided with second isolation strip of not covering electrode between the electrode surface of this importation and the feedback fraction.Include feedback fraction in input electrode, thereby realize the isolation between self-excited circuit and input and the feedback fraction.
Further improvement as said method, in first isolation strip between the importation of not covering electrode and the output and second isolation strip between input electrode face and the feedback fraction is surface-coated that insulating polymeric material arranged, on the isolation strip with macromolecule contour insulating material with itself and air insulated, reach better isolation effect.
The electrode of described importation electrode, output electrode, feedback fraction is provided with separately shape and size according to the requirement of input and output; Described first, second isolation strip is provided with its shape and size according to the insulation request between importation, output, the feedback fraction.
The described first isolation strip part is extended along the diameter symmetry distribution of disk and along thickness direction.The diameter of described disk type piezoelectric ceramic idiosome is 6-25mm, and ratio 〉=10 of diameter and thickness.
The present invention also provides a kind of manufacture method that is used for above-mentioned piezoelectric ceramic isolation signals transformer, may further comprise the steps:
(1) lining top electrode: with described disk type piezoelectric ceramic idiosome cleaning back lining top electrode, described top electrode comprises three zones, is respectively the top electrode of the top electrode of described importation, described output and the electrode of described feedback fraction; Electrode is not covered in isolation strip between the described input and output part, between described input and the feedback fraction;
(2) lining bottom electrode: with the idiosome lining bottom electrode of described lining top electrode, described bottom electrode comprises two zones, is respectively the bottom electrode of described importation, the bottom electrode of described output; Electrode is not covered in isolation strip between the described input and output part;
(3) electrode polarization: with the processing that polarizes of described lining upper/lower electrode;
Described electrode polarization step (3) polarizes along the idiosome thickness direction.
Improvement as said method, can be at the surface-coated insulating polymeric material in isolation strip between the isolation strip between the input of not covering electrode and the output and input and the feedback fraction, to reach better isolation effect, this insulating polymeric material can ooze stain on the surface, isolation strip.
After adopting piezoelectric ceramic isolation signals transformer of the present invention, because its more excellent conversion effect is when realizing conversion of signals, at low power transmission field, can also reach active signal and isolation effect, guarantee the normal operation at operating personnel's work safety and high pressure scene.Simultaneously this transformer device structure simple, be easy to make, volume is little and thin, realizes large-scale production easily, thus cost also descends thereupon.Can also not have electromagnetic interference with piezoelectric transformer in addition, have the plurality of advantages such as self-shield characteristic of load short circuits automatic cut-off work.
Description of drawings
Fig. 1 does not have the structure chart of three end self coupling piezoelectric transformers of isolation features for the Rosen type;
Fig. 2 does not have the structural model of three end self coupling piezoelectric transformers of isolation features for voltage-dropping type;
Fig. 3 is the oscillator of radial vibration mode (two dimension), and it is after the thickness direction polarization, and direction of vibration is the schematic diagram of radial direction;
Fig. 4-1 is the top plan view of the specific embodiment of the invention; Fig. 4-2 is an end view; Fig. 4-3 is importation, output, feedback fraction mode of connection schematic diagram;
Fig. 5 is suffered stress of the disk each several part of embodiment one radial vibration mode correspondence and displacement size curve chart thereof;
Fig. 6 be embodiment one on electric impedance analyzer, record radial vibration the time resonance frequency;
Fig. 7 is the test result of embodiment one, at load R
LUnder the situation for 1Kohm, the relation of its input and output voltage.
Embodiment
Fig. 4 is specific embodiments of the invention, and shown in Fig. 4-1, Fig. 4-2, Fig. 4-3, this piezoelectric ceramic isolation signals transformer is the disk type, mainly comprises following part: ceramic idiosome, importation, output, feedback fraction, isolated part.
Isolated part distributes from the diameter symmetry along disk type idiosome, and extends to down disc from last disc along thickness direction, and the piezoelectric ceramic idiosome is divided into two parts of input and output, forms first isolation strip of not covering electrode between input and the output; The first isolation strip width is 0.5～2mm; The left side, first isolation strip is the importation, and upper surface is coated with the top electrode of importation, and lower surface is coated with the bottom electrode of importation; Also be provided with by feedback fraction in the upper surface of this importation, feedback fraction is provided with covering electrodes, and powering on of this importation also is provided with second isolation strip of not covering electrode between pole-face and the feedback fraction; The width of second isolation strip is 0.5～1mm.The right, first isolation strip is an output, the upper and lower surface electrode symmetry of output.
Fig. 4-2 is the side-looking enlarged diagram of Fig. 4-1, and Fig. 4-2 middle twill filling part represents that importation electrode, grid filling part represent that feedback electrode, black filling part represent output electrode.Pottery idiosome thickness be t1, diameter be Φ 1, thickness of electrode to be t2, importation top electrode projected length be that L1, importation bottom electrode projected length are that isolation strip projected length between L6, importation top electrode and the feedback electrode is that L2, feedback electrode projected length are that isolation strip projected length between L3, importation and the output is that L4, output upper/lower electrode projected length are L5, above-mentioned projected length is closed and is: L1+L2+L3=L5=L6, L1+L2+L3+L4/2=L5+L4/2=L6+L4/2=Φ 1/2.
Also can design its counter electrode face magnitude proportion during practical application: when the needs driving force is strong, can increase the electrode area of input according to the requirement of input and output; When the needs fan-out capability is strong, then increase the area of output, this moment, fan-out capability can rise.
At feedback electrode of input design, can realize the self-excited circuit effect, the position of feedback electrode can fix on the input optional position and choose.But when feedback end comprised the center of circle, its feedback frequency and phase place were more near input.
Input and output requirement corresponding to different can change corresponding electrode, and promptly moved on both sides in the past first isolation strip among Fig. 4, and electrode position of just importing, export, feeding back and area are variable.
Width for the isolation strip is generally decided according to the requirement of isolating, and general aerial electric breakdown field strength is about 1000v/mm, and the porcelain body electric breakdown field strength is more than the 4000V/mm, and the electrical breakdown of solidifying after sealing can reach near the 4000v/mm.But the isolation strip can not be too wide, the too wide area that can reduce to import with output electrode, and influence its conversion efficiency.
The present invention utilizes the insulating properties of piezoelectric porcelain body itself, plays the safe effect of isolating output.Between piezoelectric transformer input and output electrode, keep the insulation limit that suits and form the isolation strip, thereby realize transformer input and the isolation of exporting, the isolation of promptly former limit and secondary.And can be according to the width of the suitable isolation strip of the requirement design of isolating, when under the complex environment of higher insulation request, using, can design the isolation strip wideer, reach high purpose of isolating.Two electrode districts add same voltage and polarize simultaneously along thickness direction and can obtain corresponding isolation.
This isolation signals design of transformer is that disc is a key of the present invention.Piezoelectric transformer is according to inverse piezoelectric effect and piezoelectric effect, realizes electricity-machine-electricity conversion, thereby realizes the effect of voltage transitions.The operation principle of operation principle of the present invention and common piezoelectric transformer is basic identical, but the present invention is a pattern of utilizing the vibration of disk planar extension, the one dimension vibration is expanded to two dimension, particularly when the diameter of disk and the ratio Φ/t of thickness 〉=10, polarised direction is vertical with direction of vibration, promptly realizes the radial expansion vibration.Drive electrode and generating electrode by appropriate design obtain better conversion effect.
Step-up ratio of the present invention and conversion efficiency thereof are different from the piezoelectric transformer of one dimension model of vibration.Drive end for Rosen type piezoelectric transformer is the transverse field pattern, and generating end is vertical pattern, so the longitudinal electromechanical coupling factor K33 of the transverse electromechanical coupling factor K31 of step-up ratio and efficient and material and material is relevant.The drive end of disk type piezoelectric transformer is the transverse field pattern, and the generating end also is the transverse field pattern, and when only radial vibration being arranged, it boosts, and when efficient is relevant with planar electromechanical coupling factor Kp.For disk type transformer, when its input adds driving voltage, make it produce radial vibration, and be axisymmetric radial expansion, visible disk center is a node, stress T maximum; Circumferential edges is the deformation maximum.As shown in Figure 5.
And, for the caused torsional vibration of the vibration of thickness direction, can reduce the reliability that lead is connected with electrode, the lead of drawing is come off from electrode.Therefore, utilization be the resonance frequency of radial vibration, for the present invention, be 5-20mm according to the diameter of the disk that is provided with, the radially resonance frequency of its correspondence is 100-500KHz, Fig. 6 is a resonance frequency figure of the present invention.
The preparation of the foregoing description one piezoelectric ceramic isolation signals transformer comprises two big steps:
One, the routine of disk type piezoelectric ceramic idiosome preparation: the preparation of (1) ceramic powder: the processing technology according to ceramic powder prepares needed powder, comprises mix grinding (piezoelectric of lead zirconate titanate (PTZ) base)---pre-burning (about 800 ℃)---correct grinding---oven dry; (2) blank forming: 1000---be sintered into porcelain body about 1200 ℃, the base substrate diameter is 6-25mm, and thickness is 1-2mm.
Two, covering electrodes and polarization: (1) lining top electrode: with described disk type piezoelectric ceramic idiosome cleaning back lining top electrode, described top electrode comprises three zones, is respectively the top electrode of the top electrode of described importation, described output and the electrode of described feedback fraction; Electrode is not covered in isolation strip between the described input and output part, between described input and the feedback fraction;
(2) lining bottom electrode: with the idiosome lining bottom electrode of described lining top electrode, described bottom electrode comprises two zones, is respectively the bottom electrode of described importation, the bottom electrode of described output; Electrode is not covered in isolation strip between the described input and output part;
(3) electrode polarization: with the processing that polarizes of described lining upper/lower electrode;
The process conditions of above-mentioned covering electrodes and polarization are all same as the prior art, do not repeat them here; The key point of lining is between the input and output parts, be the isolation strip between importation and the feedback fraction, does not cover electrode, but can be by insulating layer coating, as the macromolecule material of becoming attached to; The key point of polarization for along thickness direction polarization realizing single polarization, to simplify technology, but be not limited to along this direction polarization.Polarization method is not limited to along thickness direction polarization, but for the disk transformer, because along the thickness direction polarization, import identically with the polarised direction of output, can realize single polarization, and polarization process is just simple relatively.Simultaneously, along its thickness direction polarization, because its thickness is less, desired polarized voltage is also lower, is generally hundreds of volts and gets final product.Also smaller to the requirement of polarizer apparatus like this.Because it is circular monolithic, and is simple in structure, the design of electrode is also simple, then be easier to produce in batches, than the Rosen type much more simply.
Be illustrated in fig. 7 shown below, for implementation column under 1K Ω load input and the variation of output.Add the load R of 1kohm at its output
L, measure its input and the relation of output signal.When this signal transformer had following transmission performance: 5～12V input, 5V exported (load R
LBe 1Kohm), isolation reaches 3000VAC, and output voltage reaches more than the 40V when unloaded, and the response time is less than 100us.
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. a piezoelectric ceramic disk type isolation signals transformer comprises piezoelectric ceramic idiosome, importation, output, it is characterized in that: also comprise isolated part; Described piezoelectric ceramic idiosome is the disk type, described isolated part extends to another disc from one of them disc of disk type idiosome along thickness direction, the piezoelectric ceramic idiosome is divided into two parts of described input and output, forms first isolation strip of not covering electrode between described input and the output; Described importation and output are provided with covering electrodes at the idiosome upper and lower surface.
2. piezoelectric ceramic disk type isolation signals transformer according to claim 1 is characterized in that: also comprise feedback fraction; Described feedback fraction is arranged in one of them electrode surface of importation, and feedback fraction is provided with covering electrodes, is provided with second isolation strip of not covering electrode between the electrode surface of this importation and the feedback fraction.
3. piezoelectric ceramic disk type isolation signals transformer according to claim 1 and 2, it is characterized in that: there is the lining insulating material on the surface, isolation strip between the isolation strip between described importation and the output and input electrode face and the feedback fraction.
4. piezoelectric ceramic disk type isolation signals transformer according to claim 3 is characterized in that: the electrode of described importation electrode, output electrode, feedback fraction is provided with separately shape and size according to the requirement of input and output; Described first, second isolation strip is provided with its shape and size according to the insulation request between importation, output, the feedback fraction.
5. piezoelectric ceramic disk type isolation signals transformer according to claim 1 is characterized in that: extend along the diameter symmetry distribution of disk and along thickness direction described first isolation strip.
6. piezoelectric ceramic disk type isolation signals transformer according to claim 1 is characterized in that the diameter of described disk type piezoelectric ceramic idiosome is 6-25mm, and ratio 〉=10 of diameter and thickness.
7. the manufacture method of the described piezoelectric ceramic disk of claim 3 a type isolation signals transformer is characterized in that may further comprise the steps:
1. top electrode is covered: with described disk type piezoelectric ceramic idiosome cleaning back lining top electrode, described top electrode comprises three zones, is respectively the top electrode of the top electrode of described importation, described output and the electrode of described feedback fraction; Electrode is not covered in isolation strip between the described input and output part, between described input and the feedback fraction;
2. bottom electrode is covered: with the idiosome lining bottom electrode of described lining top electrode, described bottom electrode comprises two zones, is respectively the bottom electrode of described importation, the bottom electrode of described output;
Electrode is not covered in isolation strip between the described input and output part;
3. electrode polarization: with the processing that polarizes of described lining upper/lower electrode;
8. manufacture method according to claim 7 is characterized in that: 3. described electrode polarization step polarizes along the idiosome thickness direction.
9. manufacture method according to claim 7 is characterized in that: the described isolation strip of the not covering electrode insulating material that is covered is handled.
10. manufacture method according to claim 8 is characterized in that: described insulating material is to be covered with the method for oozing stain.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030852A (en) * | 2018-07-20 | 2018-12-18 | 南京航空航天大学 | A kind of piezoelectric type nuclear electromagnetic pulse isolating device |
| 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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| GB2113459A (en) * | 1982-01-14 | 1983-08-03 | Standard Telephones Cables Ltd | Piezo-electric ceramic couplers |
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| JP2003017772A (en) * | 2001-06-28 | 2003-01-17 | Nippon Soken Inc | Piezoelectric ceramic transformer circuit |
| JP2004253762A (en) * | 2002-12-24 | 2004-09-09 | Kyocera Corp | Piezoelectric transformer |
| CN101615651A (en) * | 2008-06-24 | 2009-12-30 | 金威贸易有限公司 | Insulated piezoelectric transformer |
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2010
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2113459A (en) * | 1982-01-14 | 1983-08-03 | Standard Telephones Cables Ltd | Piezo-electric ceramic couplers |
| JPH05160460A (en) * | 1991-12-05 | 1993-06-25 | Fujitsu Ltd | Piezoelectric transformer |
| JP2003017772A (en) * | 2001-06-28 | 2003-01-17 | Nippon Soken Inc | Piezoelectric ceramic transformer circuit |
| JP2004253762A (en) * | 2002-12-24 | 2004-09-09 | Kyocera Corp | Piezoelectric transformer |
| CN101615651A (en) * | 2008-06-24 | 2009-12-30 | 金威贸易有限公司 | Insulated piezoelectric transformer |
Non-Patent Citations (1)
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| 中国电子学会敏感技术分会等: "《传感器与执行器大全：传感器．变送器．执行器》", 31 March 2010, 机械工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030852A (en) * | 2018-07-20 | 2018-12-18 | 南京航空航天大学 | A kind of piezoelectric type nuclear electromagnetic pulse isolating device |
| CN109030852B (en) * | 2018-07-20 | 2020-02-21 | 南京航空航天大学 | Piezoelectric nuclear electromagnetic pulse isolation device |
| 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 |