CN102664555B - A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector - Google Patents
A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector Download PDFInfo
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- CN102664555B CN102664555B CN201210149507.4A CN201210149507A CN102664555B CN 102664555 B CN102664555 B CN 102664555B CN 201210149507 A CN201210149507 A CN 201210149507A CN 102664555 B CN102664555 B CN 102664555B
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Abstract
A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector, comprise: piezoelectric element, cover plate, dynamic vibration absorber, energy acquisition circuit and sidewall, piezoelectric element is made up of hang oneself from a beam arm configuration and the second piezoelectric stack of piezoelectric patches and the piezoelectricity that forms of overarm arm, second piezoelectric stack adheres on described sidewall, second piezoelectric stack is provided with cover plate, dynamic vibration absorber comprises the flexible member that mass and damping ratio are less than 0.3, wherein: mass is connected with flexible member, flexible member comprises the 5th support, the 6th support and overarm arm.The present invention can, by operating frequency design in multiple frequency range, realize being easy to collection that apply, efficient vibrational energy.
Description
the application is application number is 201010130519.3, the applying date, to be March 24, denomination of invention in 2010 be " based on dynamic vibration absorber device for collecting piezoelectric vibration energy " the divisional application of application for a patent for invention.
Technical field
what the present invention relates to is a kind of device of technical field of energy utilization, in particular a kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector.
Background technology
the unify common feature of the micro electromechanical systems such as individual mobile device of radio sensing network, micro-electro-mechanical systems is: energy ezpenditure is very low, from a few μ W to hundreds of mW, but require that service time is very long, limiting them and generally can not carry out energy supply with power line very crucially due to service condition.There is the shortcomings such as volume is large, the life-span is short in current battery-powered mode, adopts solar energy, thermal gradient homenergic carries out powering, need to carry out in the environment having corresponding sunlight or thermal gradient, which has limited their application.
there is the energy of abundant vibration mode in environment, these collection of energy are got up for above-mentioned micro electromechanical system power supply becomes a kind of well selection.Piezoelectric is a kind of intellectual material that can realize electromechanical energy and exchange, and just can produce electric energy endlessly when being subject to alternate stress, the power conversion of vibration can be electric energy by it.Now conventional piezoelectric has piezoelectric ceramic and piezopolymer and their compound etc., and wherein the electromechanical conversion efficiency of piezoelectric ceramic is higher, is the preferred material carrying out collection of energy.The generating mode of vibration that piezoelectric ceramic is commonly used is that in the telescopic mould of length, (piezoelectric constant is d to employing E-field normal
31
), in the thickness expansion mould of direction of wave travel, (piezoelectric constant is d to field parallel
33
) and field parallel in the thickness shear mode of direction of wave travel, (piezoelectric constant is d
15
), wherein: d
33
be about d
31
2 ~ 3 times, and d
15
be about d
31
3 ~ 4 times.Adopt suitable mode of operation can improve the efficiency of the data-collection of piezoelectric ceramic according to application scenario.Piezoelectric to be made under specific mode of operation to produce many electricity will apply large stress or make piezoelectric produce large deformation.Piezoelectric stack is that it mainly utilizes the d that piezoelectric constant is higher by stacked together for multi-disc piezoelectric patches and carry out the structure of serial or parallel connection or sections in series, part in parallel on circuit
33
on piezoelectric patches circuit, series connection can improve output voltage, parallel connection can improve output current, series and parallel design can be carried out to the requirement of electric current and voltage according to actual collecting circuit, under onesize external force effect, for onesize piezoelectric patches, the more voluminous raw electricity of stacked sheet number is larger, but sheet number too much adds volume and cost, need require in actual power consumption demand, application space and weigh between deployment cost requirement.By to the connection in series-parallel design on piezoelectric patches circuit in piezoelectric stack, it is made while increase piezoelectric length and lifting surface area, internal driving during piezoelectric material to generate electricity not to be increased or increase very little, so that realize the impedance matching with external circuit.At present, the method for carrying out collection of energy with piezoelectric stack is mainly embedded in vibrating elements, pressure (drawing) power that its two sides is equal to thus produce electric energy.If just piezoelectric stack is pasted on vibrating elements surface, the length of PZT (piezoelectric transducer) will equal quarter-wave multiple, this can make piezoelectric, and size is long at a lower frequency, such as at the nearly 21cm of 5kHz lower piezoelectric material require, thus this mode is only applicable to the frequency range of tens kilo hertzs to up to a hundred kilo hertzs.On piezoelectric stack, additional certain mass is pasted on the spring structure of proton that vibrating elements can be formed and have certain resonance frequency again, near this resonance frequency, energy conversion efficiency is very high, but due to piezoelectric ceramic very hard (rigidity is high), vibration for hundreds of hertz just needs the mass of up to a hundred kilograms, more be difficult to the frequency range being applied to below 50Hz, and piezoelectric ceramic be subject to larger static compression force after piezoelectric modulus have certain decline, make electromechanical conversion efficiency become very low, thus this structure is also difficult to application.
through finding the retrieval of prior art, Chinese invention patent notification number: CN1258866, title: piezoelectric generating apparatus, this device comprises the piezoelectric ceramic plate formed by the piezo ceramic element of two plate shapes, they are layerings and are engaged with each other with contrapolarization, wherein by the one or both sides patting piezoelectric ceramic plate with hard beater, thus the bending vibration be activated in piezoelectric ceramic plate is to produce electricity.The time of once patting generating due to beater is of short duration, the beating needing beater to continue could produce stable electric energy, but it is generally suitable only for the situation of low-frequency vibration, particularly beater and needs larger amplitude ability starting of oscillation, and these all limit its application.
Summary of the invention
the object of the invention is to overcome the deficiencies in the prior art, a kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector is provided, adopt dynamic absorber structure conventional in vibration control, be additional on piezoelectric, utilize the strong resonance effect of dynamic vibration absorber to make piezoelectric obtain enough stress, thus produce more electric energy under the low amplitude vibrations of vibrating elements.Because the resonance frequency of dynamic vibration absorber can design in from several hertz to the frequency domain of a few KHz, thus the operating frequency of energy collecting device can be selected in wider frequency domain.In addition, the energy collecting device of small size, little quality can be realized by design, and adopt the structure of piezoelectric stack and piezoelectric cantilever can widen the working band of energy collecting device simultaneously, improve the energy density of energy collecting device, thus acquisition is easy to application, efficiently energy gathering apparatus.
the present invention is achieved by the following technical solutions, the present invention includes: piezoelectric element, cover plate, dynamic vibration absorber and energy acquisition circuit, and wherein: securing cover plate on piezoelectric element, cover plate is connected with dynamic vibration absorber, and energy acquisition circuit is connected with piezoelectric element.
described dynamic vibration absorber comprises: mass and flexible member, and wherein: flexible member is connected with cover plate, mass is connected with flexible member.
the damping ratio of described flexible member is less than 0.3.
described piezoelectric element is piezoelectric stack or piezoelectricity overarm arm configuration.
described piezoelectric stack adopts thickness expansion mould or thickness shear mode.
described energy collection circuit adopts full-bridge rectification filter circuit.
the course of work of the present invention: piezoelectric element produces forced vibration by extraneous vibration element activation, in the working band of energy acquisition circuit, because the damping ratio of flexible member is less than 0.3, dynamic vibration absorber generation strong resonance effect thus drive piezoelectric element to produce the electric current of alternation, alternating current obtains comparatively galvanic current after the filtering of energy acquisition circuit rectifies, thus carries out storing or directly utilizing.
the present invention has the following advantages compared to existing technology: owing to have employed dynamic vibration absorber structure, in the present invention, piezoelectric element does not need the inside embedding extraneous vibration element, larger amplitude is not needed yet, the vibrational energy of surface to little amplitude that can be arranged in vibrating elements is easily collected, and can, by the design of the operating frequency of this device in multiple frequency range, realize being easy to collection that apply, efficient vibrational energy.
Accompanying drawing explanation
fig. 1 is the structural representation of embodiment 1.
fig. 2 is the structural representation of embodiment 2.
fig. 3 is the structural representation of embodiment 3.
fig. 4 is the structural representation of embodiment 4.
fig. 5 is the structural representation of embodiment 5.
Embodiment
elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
embodiment 1
as shown in Figure 1, the present embodiment comprises: vibrating elements 1, piezoelectric element 2, cover plate 3, dynamic vibration absorber 4 and energy acquisition circuit 5, wherein: vibrating elements 1 is connected with piezoelectric element 2, securing cover plate 3 on piezoelectric element 2, cover plate 3 is connected with dynamic vibration absorber 4, and energy acquisition circuit 5 is connected with piezoelectric element 2.
described dynamic vibration absorber 4 comprises: mass 6 and flexible member 7, and wherein: flexible member 7 is connected with cover plate 3, mass 6 is connected with flexible member 7.
the damping ratio of described flexible member 7 is less than 0.3.
the piezoelectric element 2 of the present embodiment adopts thickness expansion mould, and its piezoelectric constant is d
33
.
described energy acquisition circuit 5 is full-bridge rectification filter circuits, comprising: rectifier bridge 8, filter capacitor 9 and load 10, and wherein: piezoelectric element 2 is connected with rectifier bridge 8, rectifier bridge 8 is connected with filter capacitor 9, load 10 and filter capacitor 9 parallel connection.
in the present embodiment, piezoelectric element 2 is piezoelectric stacks, and flexible member 7 is springs.
the effect of cover plate 3 is protection piezoelectric element 2 and makes the power of flexible member 7 can be evenly distributed to the whole surface of piezoelectric element 2.Because piezoelectric Tensile is easy to damage, and intensity time is by compression higher, thus need to carry out pretension to piezoelectric stack when being applied in the strong occasion of vibration, the structure of double cover plate can be adopted, namely cover plate 3 is all arranged on piezoelectric stack both sides, carry out pretension with screw through piezoelectric, in the middle of such piezoelectric, just need perforation.
the energy that the vibrational system of vibrating elements 1, piezoelectric element 2 and dynamic vibration absorber 4 composition produces when there is resonance is maximum, and now piezoelectric element 2 is stressed is greater than outside exciting force; When excited frequency equals the natural frequency of dynamic vibration absorber 4, piezoelectric element 2 is stressed equals exciting force, and now the energy of whole device generation is also more; When the natural frequency of dynamic vibration absorber 4 equals the natural frequency of vibrating elements 1, the resonance bands of this device is the widest, and the mass ratio now increasing mass 6 and vibrating elements 1 can widen the resonance bands of this device.
embodiment 2
as shown in Figure 2, the dynamic vibration absorber 4 of the present embodiment is the superposition of two flexible members 7 and mass 6, constitutes double-deck power vibration absorbing structure.Dynamic vibration absorber 4 comprises the first spring 11, first mass 12, second spring 13 and the second mass 14, and wherein: the first spring 11 is connected with cover plate 3, the first spring 11, first mass 12, second spring 13 is connected successively with the second mass 14.Namely flexible member 7 comprises: the first spring 11 and the second spring 13, and mass 6 comprises: the first mass 12 and the second mass 14.
other execution modes of the present embodiment are identical with embodiment 1.
this embodiment adopts two springs and mass 6 to constitute Three Degree Of Freedom vibrational system with vibrating elements 1, adds formant number and resonance bands width, thus has widened the bandwidth of operation of whole device.
embodiment 3
as shown in Figure 3, the flexible member 7 of the present embodiment comprises: the first support 15, second support 16, the 3rd spring 17 and the first lever 18, mass 6 comprises: the 3rd mass 19 and the 4th mass 20, wherein: the first support 15 and the 4th mass 20 lay respectively at the two ends of the first lever 18, second support 16 is connected with cover plate 3 with the first lever 18 respectively, first support 15 is connected with the 3rd mass 19, and the 3rd mass 19 is connected with the 3rd spring 17, and the 3rd spring 17 is connected with cover plate 3.
other execution modes of the present embodiment are identical with embodiment 1.
this structure is applicable to being applied in the conditional occasion of weight.
embodiment 4
as shown in Figure 4, the flexible member 7 of the present embodiment comprises: the 3rd support 21, the 4th support 22 and overarm arm 23, wherein: one end and the 4th support 22 of overarm arm 23 are fixedly linked, the other end is provided with mass 6,4th support 22 and cover plate 3 are fixedly linked, 3rd support 21 and overarm arm 23 are flexibly connected, and the both sides of overarm arm 23 adhere to piezoelectric patches 24 respectively, and the damping ratio of whole flexible member 7 is less than 0.3.
in the present embodiment, starting of oscillation element 1 is provided with vertical sidewall 25, sidewall 25 adheres to the first piezoelectric stack 26, first piezoelectric stack 26 is provided with cover plate 3, and hang oneself from a beam arm configuration and the first piezoelectric stack 26 of the piezoelectricity that piezoelectric patches 24 and overarm arm 23 form constitutes the piezoelectric element 2 of the present embodiment.One end and the overarm arm 23 of the 3rd support 21 are movably connected, and the other end and sidewall 25 are fixedly linked.
the contact-making surface of sidewall 25 and the first piezoelectric stack 26 is provided with the angle of 10 ~ 15 degree, and this makes the first piezoelectric stack 26 main by the Tension and Compression power being parallel to polarized electric field.
be provided with two rectifier bridges 8 in energy acquisition circuit 5 to be connected with the first piezoelectric stack 26 with piezoelectric patches 24 respectively, the alternating current that piezoelectricity is exported becomes the direct current of unidirectional output, decrease the coupling of two kinds of structure output electricity, the numerical value of appropriate design filter capacitor 9 can provide more stable voltage to load 10.
other execution modes of the present embodiment are identical with embodiment 1.
in the present embodiment: when vibrating elements 1 vibrates, dynamic vibration absorber 4 just can resonate at certain band frequency, because cantilever beam 23 fixes by the 3rd support 21 and the 4th support 22, so just, the stress of alternation can be produced on two piezoelectric stacks, and due to the free partial-length of cantilever beam 23 longer, the stress that mass 6 up-down vibration produces can produce lever amplification effect on the 4th support 22, and this will increase the generating capacity of piezoelectric stack greatly.The length direction of the first piezoelectric stack 26 is arranged along the Width of cantilever beam 23, can reduce the length of cantilever beam 23 standing part like this, increases the amplification of lever.In fact, owing to adopting cantilever beam 23, the resonance frequency of dynamic vibration absorber 4 is more, can carry out efficient vibration energy harvesting in multiple frequency range.
embodiment 5
as shown in Figure 5, the present embodiment adopts the comparatively large (d of piezoelectric constant
15
) thickness shear mode, the second piezoelectric stack 27 is pasted on upright side walls 25, and the contact-making surface of sidewall 25 and the second piezoelectric stack 27 does not have angle.In the present embodiment, flexible member 7 comprises: cantilever beam 23, the 5th support 28 and the 6th support 29, wherein: the 5th support 28 one end is fixed on sidewall 25, and one end is connected with cantilever beam 23,6th support 29 one end is fixed on cover plate 3, and one end is connected with cantilever beam 23.The both sides of cantilever beam 23 are provided with piezoelectric patches 24.
other execution modes of the present embodiment are identical with embodiment 4.
Claims (3)
1. a Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector, comprise: piezoelectric element, cover plate, dynamic vibration absorber and energy acquisition circuit, it is characterized in that, also comprise sidewall (25), described piezoelectric element is made up of hang oneself from a beam arm configuration and the second piezoelectric stack (27) of piezoelectric patches (24) and overarm arm (23) piezoelectricity that forms, second piezoelectric stack (27) adheres on described sidewall (25), second piezoelectric stack (27) is provided with cover plate (3), described dynamic vibration absorber comprises the flexible member that mass (6) and damping ratio are less than 0.3, wherein: mass is connected with flexible member, described flexible member comprises the 5th support (28), 6th support (29) and overarm arm (23), wherein: one end the respectively with five support (28) of overarm arm (23) and one end of the 6th support (29) are connected, the other end of the 5th support (28) is fixed on described sidewall (25), the other end of the 6th support (29) is fixed on described cover plate (3), energy acquisition circuit is connected with piezoelectric element.
2. Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector according to claim 1, is characterized in that, the both sides of described overarm arm (23) are respectively equipped with piezoelectric patches (24).
3. Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector according to claim 1, is characterized in that, described energy collection circuit is current rectifying and wave filtering circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149507.4A CN102664555B (en) | 2010-03-24 | 2010-03-24 | A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149507.4A CN102664555B (en) | 2010-03-24 | 2010-03-24 | A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector |
| CN2010101305193A CN101741278B (en) | 2010-03-24 | 2010-03-24 | Dynamic vibration absorber-based device for collecting piezoelectric vibration energy |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101305193A Division CN101741278B (en) | 2010-03-24 | 2010-03-24 | Dynamic vibration absorber-based device for collecting piezoelectric vibration energy |
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| CN102664555A CN102664555A (en) | 2012-09-12 |
| CN102664555B true CN102664555B (en) | 2015-09-30 |
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| CN103414379B (en) * | 2013-08-28 | 2015-08-12 | 上海交通大学 | Based on the piezoelectric energy gatherer of linear resonator and non-linear vibration generator |
| CN103731066B (en) * | 2013-12-13 | 2015-12-09 | 东南大学 | Multidirectional vibration generating device |
| CN106160573B (en) * | 2016-06-15 | 2017-11-21 | 浙江师范大学 | A kind of self-excitation piezoelectric harvester for river monitoring |
| CN106026771B (en) * | 2016-06-15 | 2017-11-24 | 浙江师范大学 | It is a kind of from frequency modulation piezoelectricity current energy accumulator |
| CN106549625B (en) * | 2016-12-08 | 2018-12-28 | 清华大学 | A kind of composite pavement energy collecting device |
| CN107769610B (en) * | 2017-10-20 | 2020-02-18 | 上海工程技术大学 | Luggage rack power generation device |
| CN108448939B (en) * | 2018-05-02 | 2020-01-31 | 厦门大学 | composite piezoelectric-thermoelectric automobile exhaust micro energy collector |
| CN109861584B (en) * | 2019-04-09 | 2024-02-09 | 苏州市职业大学 | Power generation device for collecting arm swing energy |
| CN112532108B (en) * | 2020-12-07 | 2022-02-22 | 上海大学 | Vibration energy collecting device based on piezoelectric stack and electromagnetic induction |
| CN114094707B (en) * | 2021-11-24 | 2024-07-05 | 国网上海市电力公司 | Substation auxiliary control system and method based on OPCUA |
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| KR0165517B1 (en) * | 1996-03-07 | 1999-05-01 | 김광호 | Vibration detecting sensor |
| JP4546471B2 (en) * | 2003-07-30 | 2010-09-15 | ザ・ボーイング・カンパニー | Strain energy shuttle apparatus and method for vibration energy collection |
| CN101272109A (en) * | 2008-05-07 | 2008-09-24 | 中国科学院电工研究所 | Broad-band piezoelectricity oscillating generating set |
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