CN201656813U - Node of wireless sensor networks using piezoelectric generator power supply - Google Patents
Node of wireless sensor networks using piezoelectric generator power supply Download PDFInfo
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- CN201656813U CN201656813U CN2010201843454U CN201020184345U CN201656813U CN 201656813 U CN201656813 U CN 201656813U CN 2010201843454 U CN2010201843454 U CN 2010201843454U CN 201020184345 U CN201020184345 U CN 201020184345U CN 201656813 U CN201656813 U CN 201656813U
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Abstract
The utility model relates to a node of wireless sensor networks using piezoelectric generator power supply, an energy self-supplying node of wireless sensor networks. The whole node uses the combine piezoelectric generator power supply, thereby the battery is unnecessary to be changed or charged. The utility model is characterized in that the cantilever beam of the piezoelectric generator is combined cantilever beam structure, and on both sides of each cantilever beam are provided with a plurality of piezoelectric elements, which can obtain the required voltage and current through the series connection and parallel connection. By using the utility model, the defects of the piezoelectric cantilever beam of the bending type piezoelectric generating device such as high working efficiency and fragileness can be corrected. The utility model has advantages of large capacity, high generating efficiency, long service life, and ability of realizing the none-maintenance and 24-hour function of the node of wireless sensor networks.
Description
Technical field
The utility model relates to a kind of wireless sensor network node of piezoelectric generator power supply, it is a kind of wireless sensor network node of energy-autarchic, whole node adopts the power supply of composite type piezoelectric generator, need not to change battery or to battery charge, realizes round-the-clock, non-maintaining work.
Background technology
The distributed network of the oriented mission that wireless sensor network (Wireless Sensor Networks) is made up of great deal of nodes, combine transducer, embedded calculating, modern network and radio communication, multi-field technology such as distributed information processing, by all kinds of microsensors information object is monitored in real time, by embedded microprocessor information is carried out processed, and information is sent to the long-distance user by cordless communication network, in national defense safety, the various controls in industrial or agricultural field, city management, biologic medical, environmental monitoring, rescue and relief work, anti-probably anti-terrorism, all there are important scientific research value and practical value in fields such as deathtrap Long-distance Control, have very wide application prospect.
Existing wireless sensor network node generally adopts powered battery, and the shortcoming of oneself is arranged: traditional battery is big because of its volume, short can not satisfy instructions for use gradually useful life; When battery electric quantity deficiency, leakage or loose contact, the communication sensitivity of wireless sensor network node, communication distance all reduce greatly, when serious even communicate by letter malfunctioningly, therefore need often to change battery, or to battery charge, have increased use cost; Simultaneously, battery contains heavy metal, and the improper meeting of old and useless battery treatment is made serious environmental and polluted.The battery instructions for use that can not satisfy wireless sensor network node fully gradually.
For solving this restriction problem, the science researcher has introduced " energy acquisition " this notion." energy acquisition " said on the ordinary meaning in fact refers in particular to other forms of energy acquisition, is converted to electric energy.Be about to energy conversion in the device environment of living in and be power storage in energy storage devices such as battery, electric capacity to satisfy the demand of device.
The source of energy acquisition comprises solar energy in the environment, vibrational energy, noise, various energy resources such as temperature gradient.Wherein, vibration mechanical energy is a kind of more general energy form, extensively be present in various productions and lifestyle devices such as building, bridge, vehicle, boats and ships, aircraft, electromechanical equipment, also be present in the life process such as limb motion, blood flow, heartbeat of human body, and high energy density (250-330 μ W/cm is arranged
3).Therefore vibration mechanical energy collection is had a very wide range of applications.
Collection and three kinds of modes of the main existence of conversion to vibrational energy: piezoelectric type, electrostatic and electromagnetic type.The energy density of piezoelectric type energy acquisition mode is big, simple in structurely is convenient to microminiaturization.The operation principle of piezo-electric generating is based on direct piezoelectric effect, and the vibration mechanical energy of environment or human body is converted into electric energy.According to the structure difference of piezoelectric generating device, two kinds of generation modes of collision type piezo-electric generating and bending-type piezo-electric generating are arranged.The collision type generating is that stress changes when utilizing piezoelectric element to be collided, and produces electric energy.And the bending-type piezo-electric generating is when utilizing the piezoelectric element bending, and stress changes, and produces electric energy.
In the bending-type piezoelectric generating device, piezoelectric generally all is to make Piezoelectric Cantilever Beams.Such as Chinese patent CN 100414808C a kind of piezoelectric harvester has been proposed, free end hangs the cantilever beam two sides of lumped mass piece and pastes piezoelectric, in cantilever beam when vibration, is by piezoelectric output electric energy and store, but the electric energy that produces is less, is mainly used in the power supply of microelectronic component.Chinese patent CN101017989A also discloses a kind of piezoelectric cantilever electricity generation system for the micro radio sensing network node power supply, and wherein piezoelectric still sticks on the upper and lower surface of cantilever beam.Chinese patent CN101262189A discloses a kind of piezoelectric generating device that utilizes cantilever beam, and wherein piezoelectric still sticks on the upper and lower surface of metal cantilever beam.United States Patent (USP) WO 2007121092 also described be mainly used in MEMS (micro electro mechanical system) (MEMS) power supply the piezoelectric energy recovery device of cantilever beam structure.Above-mentioned utility model patent all is to utilize the mechanical oscillation of single piezoelectric cantilever to produce electric energy, because the structural limitations of system can only convert the mechanical oscillation of a certain frequency in the external world to electric energy, generating efficiency is low, frequency range is narrow, can only be used for the power supply of miniature electronic system.Chinese patent CN 101272109A discloses a kind of a plurality of piezoelectric cantilevers that utilize two groups of interdigitations, carries out the wideband Blast Furnace Top Gas Recovery Turbine Unit (TRT); Piezoelectric cantilever wherein is directly to be made by piezoelectric element, or makes by piezoelectric element is bonding.Chinese patent CN 101017989A discloses a kind of self-supply micro radio sensing network node based on piezoelectric vibration power generation, utilizes piezoelectric cantilever, converts the vibration mechanical energy of environment to electric energy, is the radio sensing network power supply.
In above-mentioned piezoelectric generating device, piezoelectric cantilever is by two kinds of versions, and a kind of is directly with component affixing together, forms the piezoelectric bimorph cantilever beam structure; Another kind is the two sides that piezoelectric element is sticked on other Material Cantilever Beam, forms the sandwich structure piezoelectric cantilever.
In existing piezo-electric generating patent, no matter the Piezoelectric Cantilever Beams of that a kind of form all is to be pasted mutually by the piezoelectric element of monoblock, or sticks on the two sides of other Material Cantilever Beam by the piezoelectric element of monoblock, forms piezoelectric cantilever.In piezoelectric generating device, piezoelectric commonly used is a piezoelectric ceramic.Because the modulus of elasticity of piezoelectric ceramic is bigger, the piezoelectric cantilever single order flexural resonance frequency of being made by the piezoelectric element of monoblock is higher like this, and the mechanical oscillation that provide by natural environment or human body, vibration frequency is generally very low.Like this, in use, be difficult to make piezoelectric cantilever to reach the resonance operating state, the electric energy of generation is fewer, can't satisfy general power supply needs.And by the piezoelectric cantilever that the piezoelectric element of monoblock is made, piezoelectric fragility wherein is bigger, and easy fracture damage influences useful life of whole piezoelectric generating device.
Summary of the invention
The purpose of this utility model provides a kind of wireless sensor network node of piezoelectric generator power supply, solving above-mentioned piezoelectric cantilever generating for the radio sensing network node power supply all is to utilize the mechanical oscillation of single piezoelectric cantilever to produce electric energy, exist because the structural limitations of system, can only convert the mechanical oscillation of a certain frequency in the external world to electric energy, generating efficiency is low, frequency range is narrow, the deficiency that can only be used for the power supply of miniature electronic system, realize that by the utility model energy output is big, the generating efficiency height, long service life can realize that wireless sensor network node is non-maintaining, all weather operations.
The purpose of this utility model is achieved through the following technical solutions, a kind of wireless sensor network node of piezoelectric generator power supply, comprise by piezoelectric generator, rectifier, pressurizer, controller, the electric supply installation that energy storage device is formed, comprise embedded OS, sensing module, data processing and control module, the wireless sensor network node that radio receiving transmitting module and antenna are formed, it is characterized in that, cantilever beam in the described piezoelectric generator is the composite type cantilever beam structure, some piezoelectric elements are posted on the two sides of each cantilever beam, and some piezoelectric elements on several cantilever beams obtain required voltage and electric current through connection in series-parallel.
Described composite type cantilever beam is made of several cantilever beams that are arranged in order, and each cantilever beam is parallel alternate, and the one end is fixed on the support, other end freedom, and the free end two sides is fixed with mass.
Described piezoelectric element is by piezoelectric and be coated with the electrode that is plated in the piezoelectric upper and lower surface and constitute.
Piezoelectric is one of piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material or its combination in the described piezoelectric element.
Described energy storage device is electric capacity or battery or rechargeable battery.
Described radio receiving transmitting module adopts 802.11b or 802.15.4 or Bluetooth or UWB or RF or IrDA or WiFi or GPRS technology.
The utility model is by constituting the composite type cantilever beam with the cantilever beam in the piezoelectric generator by several, simultaneously post some piezoelectric elements on the two sides of each cantilever beam, some piezoelectric elements obtain required voltage and electric current through connection in series-parallel, and the utility model advantage mainly contains: (1) single order crooked syntony frequency is lower; (2) piezoelectric element is not fragile in use, has increased the useful life of device.This structure changes into electric energy to vibration mechanical energy along with the vibration of surrounding environment.Replace the monoblock piezoelectric element to stick on the cantilever beam two sides with the multi-disc piezoelectric element, make the single order crooked syntony frequency of piezoelectric cantilever lower, in natural environment, or when Blast Furnace Top Gas Recovery Turbine Unit (TRT) carried, be easy to make cantilever beam to reach the crooked syntony state, at this moment, the STRESS VARIATION on cantilever beam surface reaches maximum, piezoelectric element output voltage (electric current) also reaches maximum, and generating efficiency is the highest.Simultaneously the piezoelectric element serial or parallel connection on the cantilever beam is connected.If be connected in series, to compare with single piezoelectric element, the output voltage of two piezoelectric elements increases and is twice, and electric current is constant; If be connected in parallel, to compare with single piezoelectric element, the output current of two piezoelectric elements increases and is twice, and voltage is constant.Concrete connecting mode can be according to the demand decision of output electric weight.The utility model overcomes the shortcoming of piezoelectric cantilever operating frequency height in the present bending-type piezoelectric generating device, easy fracture damage, the utility model energy output is big, generating efficiency is high, long service life, can realize non-maintaining, all weather operations of wireless sensor network node.
Description of drawings
Fig. 1 is the structural representation of piezoelectric element in the utility model.
Fig. 2 is the end view of cantilever beam in the utility model.
Fig. 3 is the vertical view of cantilever beam in the utility model.
Fig. 4 is the structural representation of piezoelectric generator in the utility model.
Fig. 5 is the utility model structural representation.
Embodiment
Further specify the utility model with specific embodiment in conjunction with the accompanying drawings, Fig. 1 has described the structure of piezoelectric element in the utility model, and piezoelectric element comprises piezoelectric 2, electrode 1 and 3.Electrode 1,3 is coated with the two sides that is plated in piezoelectric 2, and piezoelectric 2 is positioned at the centre of two electrodes, similar sandwich structure; The polarised direction of piezoelectric 2 is parallel to thickness direction.Because direct piezoelectric effect when piezoelectric element 2 is subjected to ess-strain, will produce electric charge and voltage on electrode.
Fig. 2 and Fig. 3 have described end view and the vertical view that the cantilever beam structure of some piezoelectric elements has been pasted on the two sides, piezoelectric element 5,6,7,8,9,10 ... stick on equably by glue-line on the upper and lower surface of cantilever beam 4; The free end two sides of cantilever beam 4 is fixed with mass 11,12 symmetrically.The crooked syntony frequency of cantilever beam 4 is determined jointly by material, the physical dimension of cantilever beam 4, piezoelectric element and mass 11,12.When vibration takes place in cantilever beam 4, stick on the stress that piezoelectric element on the cantilever beam 4 will be subjected to alternation, on the electrode 1,3 of piezoelectric element, produce electric charge and voltage, convert vibration mechanical energy to electric energy.If resonance take place for cantilever beam 4, then the stress that is subjected to of piezoelectric element will reach maximum, and the electric weight that piezoelectric element produces also can reach maximum.
Fig. 4 has described the structure of piezoelectric generator, and several have the different structure size, and upper and lower surface is pasted the cantilever beam 4,15,16,17 of some piezoelectric elements ..., an end of each cantilever beam is fixed on the support 13, other end freedom; Whole piezoelectric generator is installed in 14 li on shell.When the vibration of external environment causes crust of the device and mount vibration, cantilever beam will be vibrated, produce electric energy.When the vibration frequency of external environment during near the resonance frequency of cantilever beam, will make cantilever beam generation resonance, the electric weight of generation reaches maximum.Because the piezoelectric generator resonance frequency is lower in the utility model, the vibration of external environment causes the resonance of piezoelectric generator easily, and farthest the vibrational energy in the absorbing environmental is realized efficient power generation.
Fig. 5 has described the utility model structural representation.Piezoelectric generator 19 converts the vibration mechanical energy of mechanical vibration source 18 electric energy of alternation to, and rectifier 20 converts the electric energy of alternation to the electric energy of direct current.Pressurizer 21 is adjusted into the needed voltage and current of energy storage device with direct current energy.Controller 22 prevents that energy storage device to the piezoelectric element reverse charging, also carrying out charge protection to storage device, prevents to overcharge.Energy storage device 23 gets up the power storage that piezoelectric generator produces, and is the radio sensing network node power supply.Storage device can be electrochemical capacitor, rechargeable battery, super capacitor etc.After signal process data processing that transducer 25 collects and control module 26 are handled,, send by antenna 28 by radio receiving transmitting module 27.Radio receiving transmitting module 27 adopts 802.11b (standard of IEEE WLAN (wireless local area network)) or 802.15.4 (purple honeybee, the IEEE802.15.4 agreement) or B1uetooth (bluetooth) or UWB (ultra broadband) or RF (radio frequency) or IrDA (infrared data transfer of data) or WiFi (technology of Wireless Networking) or GPRS (general packet radio service technology), between them be or relation.Whole wireless sensor network node is controlled by embedded OS 30.Embedded OS is a kind of broad-spectrum systems soft ware, is responsible for whole soft, the distribution of hardware resource, the task scheduling of embedded system, controls, coordinates concurrent activity.Embedded OS in the utility model is identical with common embedded OS.
It will be understood by those skilled in the art that material, shape, the size of cantilever beam in the utility model, amount of piezoelectric element can be adjusted as the case may be on each cantilever beam.Piezoelectric can be made by one of piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material or its combination.
Though above literal has been described the utility model with reference to certain embodiments and example of the present utility model, the utility model is not limited to embodiment described above.According to know-why of the present utility model, those of ordinary skills make amendment and are out of shape with reference to above-mentioned know-why embodiment and all belong to protection range of the present utility model.
Claims (6)
1. the wireless sensor network node of piezoelectric generator power supply, comprise the electric supply installation of forming by piezoelectric generator, rectifier, pressurizer, controller, energy storage device, comprise the wireless sensor network node that embedded OS, sensing module, data processing and control module, radio receiving transmitting module and antenna are formed, it is characterized in that, cantilever beam in the described piezoelectric generator is the composite type cantilever beam structure, some piezoelectric elements are posted on the two sides of each cantilever beam, and some piezoelectric elements on several cantilever beams obtain required voltage and electric current through connection in series-parallel.
2. the wireless sensor network node of piezoelectric generator power supply according to claim 1, it is characterized in that, described composite type cantilever beam is made of several cantilever beams that are arranged in order, each cantilever beam is parallel alternate, the one end is fixed on the support, other end freedom, the free end two sides is fixed with mass.
3. the wireless sensor network node of piezoelectric generator according to claim 1 power supply is characterized in that, described piezoelectric element is by piezoelectric and be coated with the electrode that is plated in the piezoelectric upper and lower surface and constitute.
4. according to the wireless sensor network node of claim 1 or 3 described piezoelectric generator power supplies, it is characterized in that piezoelectric is one of piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material or its combination in the described piezoelectric element.
5. the wireless sensor network node of piezoelectric generator power supply according to claim 1 is characterized in that described energy storage device is electric capacity or battery or rechargeable battery.
6. the wireless sensor network node of piezoelectric generator power supply according to claim 1 is characterized in that described radio receiving transmitting module adopts 802.11b or 802.15.4 or Bluetooth or UWB or RF or IrDA or WiFi or GPRS technology.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201843454U CN201656813U (en) | 2010-04-28 | 2010-04-28 | Node of wireless sensor networks using piezoelectric generator power supply |
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| CN2010201843454U CN201656813U (en) | 2010-04-28 | 2010-04-28 | Node of wireless sensor networks using piezoelectric generator power supply |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237761A (en) * | 2010-04-28 | 2011-11-09 | 扬州博达电气设备有限公司 | Wireless sensor network node supplied with power by piezoelectric generator |
| CN103312214A (en) * | 2013-05-29 | 2013-09-18 | 昆山攀特电陶科技有限公司 | Row type pressure energy collecting device |
| CN105737904A (en) * | 2016-04-28 | 2016-07-06 | 河南丹江大观苑旅游有限公司 | Water quality monitoring system for water area of scenic spot |
| CN107302254A (en) * | 2017-08-14 | 2017-10-27 | 苏州骅奔物联网有限公司 | A kind of adaptive micro-vibration power supply |
| CN108233311A (en) * | 2018-02-01 | 2018-06-29 | 三峡大学 | A kind of vibration energy harvesting quake protection to wireless sensor energy supply is hammered into shape |
| CN109428513A (en) * | 2017-08-25 | 2019-03-05 | 青岛因菲尼思微电子科技有限公司 | A kind of wireless sensing module based on wideband vibration energy collector |
| US10743088B2 (en) | 2017-02-16 | 2020-08-11 | Watlow Electric Manufacturing Company | Compact modular wireless sensor |
| US20220349759A1 (en) * | 2020-05-11 | 2022-11-03 | Zhejiang University | Self-energy type thermal response monitoring device |
-
2010
- 2010-04-28 CN CN2010201843454U patent/CN201656813U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237761A (en) * | 2010-04-28 | 2011-11-09 | 扬州博达电气设备有限公司 | Wireless sensor network node supplied with power by piezoelectric generator |
| CN103312214A (en) * | 2013-05-29 | 2013-09-18 | 昆山攀特电陶科技有限公司 | Row type pressure energy collecting device |
| CN103312214B (en) * | 2013-05-29 | 2015-12-02 | 昆山攀特电陶科技有限公司 | Row's formula pressure is adopted can device |
| CN105737904A (en) * | 2016-04-28 | 2016-07-06 | 河南丹江大观苑旅游有限公司 | Water quality monitoring system for water area of scenic spot |
| US10743088B2 (en) | 2017-02-16 | 2020-08-11 | Watlow Electric Manufacturing Company | Compact modular wireless sensor |
| CN107302254A (en) * | 2017-08-14 | 2017-10-27 | 苏州骅奔物联网有限公司 | A kind of adaptive micro-vibration power supply |
| CN109428513A (en) * | 2017-08-25 | 2019-03-05 | 青岛因菲尼思微电子科技有限公司 | A kind of wireless sensing module based on wideband vibration energy collector |
| CN108233311A (en) * | 2018-02-01 | 2018-06-29 | 三峡大学 | A kind of vibration energy harvesting quake protection to wireless sensor energy supply is hammered into shape |
| US20220349759A1 (en) * | 2020-05-11 | 2022-11-03 | Zhejiang University | Self-energy type thermal response monitoring device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20180428 |