CN202385033U - Single chip cantilever piezoelectric vibration generator - Google Patents
Single chip cantilever piezoelectric vibration generator Download PDFInfo
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- CN202385033U CN202385033U CN2011205560285U CN201120556028U CN202385033U CN 202385033 U CN202385033 U CN 202385033U CN 2011205560285 U CN2011205560285 U CN 2011205560285U CN 201120556028 U CN201120556028 U CN 201120556028U CN 202385033 U CN202385033 U CN 202385033U
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- piezoelectric
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- elastic layer
- vibration generator
- piezoelectric vibration
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Abstract
The utility model relates to a piezoelectric vibration generator, in particular to a single chip cantilever piezoelectric vibration generator. The single chip cantilever piezoelectric vibration generator comprises a base, an elastic layer, a piezoelectric layer, a bonding layer and a mass block. According to the single chip cantilever piezoelectric vibration generator, the elastic layer with large modulus of elasticity, the piezoelectric layer having the same thickness with but different lengths from the elastic layer and the mass block with big density are utilized, accordingly, open circuit output power of the single chip cantilever piezoelectric vibration generator is improved.
Description
Technical field
The utility model relates to a kind of piezoelectric vibration power generation machine, especially a kind of single-chip cantilever type piezoelectric vibrating electricity generator.
Background technology
Low-power consumption products such as microelectronics, wireless network sensor and MEMS have obtained greatly developing; Their main energy-provision way are chemical cells, but chemical cell exists many drawbacks, and are limited like battery life; Need regularly to change, sometimes environmental limitations and change difficulty.Environment exist multiple low-frequency mechanical vibrations can, if can be from surrounding environment harvest energy, realize self energizing, can solve the problem of energy deficiency.Piezoelectric harvester is because of having higher power density and electromechanical coupling factor; Need not extraneous power supply; Do not generate heat, no electromagnetic interference, pollution-free and be easy to the miniaturization of implementation structure, advantage such as integrated, and the energy supply demand that can satisfy this type of low-power consumption product be widely used as the prisoner can element.But the vibration frequency in the environment is generally all lower, is 50Hz like the vibration frequency of automobile engine, and the vibration frequency of power transformer is 100Hz.Collect for low-frequency vibration energy, can adopt the cantilever style monocrystalline piezoelectric energy accumulator of piezoelectric layer and the isometric structure of elastic layer to realize, but the operating efficiency of this structure is lower.
The utility model content
The utility model technical problem to be solved is the deficiency to the above-mentioned background technology, a kind of piezoelectric layer and elastic layer length is provided than the single-chip cantilever type piezoelectric prisoner ability device that is 0.66.
The utility model is for realizing that above-mentioned utility model purpose adopts following technical scheme:
A kind of single-chip cantilever type piezoelectric vibrating electricity generator, said piezoelectric vibration power generation machine is connected with load through lead, and said piezoelectric vibration power generation machine comprises: pedestal, elastic layer, piezoelectric layer, tack coat, mass; Wherein: an end of said elastic layer is fixedly connected with pedestal, and the other end of elastic layer is fixedly connected with mass, and piezoelectric layer is bonded in the upper surface of elastic layer through tack coat, and the upper surface of piezoelectric layer and lower surface are coated with an electrode respectively.
In the said single-chip cantilever type piezoelectric vibrating electricity generator, the thickness ratio of piezoelectric layer and elastic layer is 1: 1, and the ratio of piezoelectric layer and elastic layer effective length is 0.66.
In the said single-chip cantilever type piezoelectric vibrating electricity generator, piezoelectric layer is a PZT-5H type piezoelectric ceramic, and the material of said elastic layer is a stainless steel.
The utility model adopts technique scheme, has following beneficial effect: improved the single-chip cantilever type piezoelectric and shaken
The open circuit power output of moving generator.
Description of drawings
Fig. 1 is a single-chip cantilever type piezoelectric electrification structure model sketch map.
Fig. 2 is piezoelectric layer and the sketch map of elastic layer length ratio with piezoelectric vibration power generation machine open circuit power output relation.
Fig. 3 is the circuit diagram of single-chip low frequency cantilever type piezoelectric vibrating electricity generator powering load.
Label declaration among the figure: 1 is pedestal, and 2 is elastic layer, and 3 is piezoelectric layer, and 4 is tack coat, and 5 is mass, and 6 and 7 is the argent electrode, and 8 and 9 is lead, and 10 are load.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to utility model:
Single-chip cantilever type piezoelectric vibrating electricity generator as shown in Figure 1 comprises: pedestal 1, elastic layer 2, piezoelectric layer 3, mass 5.One end of elastic layer 2 is fixedly connected with pedestal 1, and the other end of elastic layer 2 is fixedly connected with mass 5.
The circuit diagram of single-chip low frequency cantilever type piezoelectric vibrating electricity generator powering load is as shown in Figure 3, and elastic layer 2 exceeds being partially embedded in the pedestal 1 of piezoelectric layer 3, is called stiff end, is called free end with the other end of the corresponding cantilever beam of stiff end.Be fixed with mass 5 at free end, mass 5 is materials such as material with higher density such as tungsten, nickel, lead.Elastic layer 2 bonds together through tack coat 4 with piezoelectric layer 3.The thickness of tack coat is enough thin, makes between electrode 7 and the elastic layer 4 to keep short-circuit condition.The material of elastic layer 2 is a stainless steel, forces down layer 3 and has selected PZT-5H type piezoelectric ceramic for use, and the material of tack coat is 504 seccotines, and its component ratio is A: B=2: 1.Piezoelectric layer 3 thickness and elastic layer 2 thickness equate, piezoelectric layer 2 length L
pAnd the length ratio between the cantilever beam effective length L is 0.66.The upper surface of piezoelectric layer 3 and lower surface are coated with an argent electrode 6 respectively and 7, two argent electrodes 6 are connected with load 10 through lead 8, elastic layer 4 and lead 9 respectively with 7.
Direct piezoelectric effect principle by piezoelectric ceramic:
Can know that when cantilever beam is receiving under the effect of z direction inertia force, piezoelectric layer can produce in the x direction and stretch and compression, and at z to forming coupled electric field.In the formula (1), s
11, ε
33And d
31Be respectively softness factor, dielectric constant and the piezoelectric constant of piezoelectric, D
3Be electric displacement, E
3Be electric field strength, S
1And σ
1Be respectively strain and stress.The d of PZT-5H type piezoelectric ceramic
31 2/ ε
33Ratio is higher, can effectively improve the energy output of piezoelectric vibration power generation machine.
The vibration acceleration of pedestal is A
InThe time, the open circuit power output of vibrating electricity generator does
M is the quality of mass in the formula, L
pBe the length of piezoelectric layer, L is the distance of cantilever beam stiff end to the mass barycenter, is called the effective length of cantilever beam.Z is the position of neutral axis of cantilever beam, z=(t
p 2-η t
s 2)/2 (t
p+ η t
s), t
pBe the thickness of piezoelectric layer, t
sBe the thickness of elastic layer, η=E
p/ E
s, E
sBe the modulus of elasticity of elastic layer, E
pModulus of elasticity for piezoelectric layer.In order to make piezoelectric layer inside have more stress, must avoid piezoelectric layer to receive tension stress and compression simultaneously, so the position of neutral axis must be positioned at elastic layer, that is:
I is the torque inertia of cantilever beam with respect to neutral axis, I=(wt
p 2/ 12)+wt
p(z+t
p/ 2)+η wt
s 2+ η wt
p(z+t
s/ 2), w is the width of cantilever beam.Piezoelectric layer is as shown in Figure 2 with the graph of a relation of piezoelectric vibration power generation machine open circuit power output with elastic layer length ratio.
Can know by formula (2); The elastic layer 2 of stainless steel has higher modulus of elasticity; It is big to have mass 5 quality that the material of higher density processes, and piezoelectric layer 3 thickness and elastic layer 2 thickness equate to have guaranteed that position of neutral axis is positioned at elastic layer 2, and when piezoelectric layer 3 length L
pAnd the length ratio between the cantilever beam effective length L is 0.66 o'clock, and the power output of single-chip low frequency cantilever type piezoelectric vibrating electricity generator is maximum.
Claims (3)
1. single-chip cantilever type piezoelectric vibrating electricity generator, said piezoelectric vibration power generation machine is connected with load through lead, it is characterized in that comprising: pedestal, elastic layer, piezoelectric layer, tack coat, mass; Wherein: an end of said elastic layer is fixedly connected with pedestal, and the other end of elastic layer is fixedly connected with mass, and piezoelectric layer is bonded in the upper surface of elastic layer through tack coat, and the upper surface of piezoelectric layer and lower surface are coated with an electrode respectively.
2. single-chip cantilever type piezoelectric vibrating electricity generator according to claim 1, the thickness that it is characterized in that said piezoelectric layer and elastic layer is than being 1:1, the ratio of piezoelectric layer and elastic layer effective length is 0.66.
3. single-chip cantilever type piezoelectric vibrating electricity generator according to claim 1 is characterized in that said piezoelectric layer is a PZT-5H type piezoelectric ceramic, and the material of said elastic layer is a stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205560285U CN202385033U (en) | 2011-12-28 | 2011-12-28 | Single chip cantilever piezoelectric vibration generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205560285U CN202385033U (en) | 2011-12-28 | 2011-12-28 | Single chip cantilever piezoelectric vibration generator |
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| Publication Number | Publication Date |
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| CN202385033U true CN202385033U (en) | 2012-08-15 |
Family
ID=46633503
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205560285U Expired - Fee Related CN202385033U (en) | 2011-12-28 | 2011-12-28 | Single chip cantilever piezoelectric vibration generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420542A (en) * | 2011-12-28 | 2012-04-18 | 东南大学 | Single-chip cantilever type piezoelectric vibration generator |
| CN104135186A (en) * | 2013-05-03 | 2014-11-05 | 纳米新能源（唐山）有限责任公司 | Cantilever beam structure friction generator and generator set |
| CN104786754A (en) * | 2014-01-22 | 2015-07-22 | 纳米新能源（唐山）有限责任公司 | self-powered tire pressure monitoring system |
| CN105656346A (en) * | 2016-03-18 | 2016-06-08 | 河南师范大学 | Piezoelectric single wafer type inertia piezoelectric motor |
-
2011
- 2011-12-28 CN CN2011205560285U patent/CN202385033U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420542A (en) * | 2011-12-28 | 2012-04-18 | 东南大学 | Single-chip cantilever type piezoelectric vibration generator |
| CN104135186A (en) * | 2013-05-03 | 2014-11-05 | 纳米新能源（唐山）有限责任公司 | Cantilever beam structure friction generator and generator set |
| WO2014176937A1 (en) * | 2013-05-03 | 2014-11-06 | 纳米新能源（唐山）有限责任公司 | Friction generator and generator set of cantilever beam structure |
| CN104786754A (en) * | 2014-01-22 | 2015-07-22 | 纳米新能源（唐山）有限责任公司 | self-powered tire pressure monitoring system |
| CN104786754B (en) * | 2014-01-22 | 2017-06-30 | 纳米新能源（唐山）有限责任公司 | A kind of self-powered pressure of tire monitoring system |
| CN105656346A (en) * | 2016-03-18 | 2016-06-08 | 河南师范大学 | Piezoelectric single wafer type inertia piezoelectric motor |
| CN105656346B (en) * | 2016-03-18 | 2018-07-10 | 河南师范大学 | Piezoelectric monocrystal chip inertia piezoelectric motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20141228 |
|
| EXPY | Termination of patent right or utility model |