CN201054553Y - Power supply device for radio sensor network node based on piezoelectric porcelain vibration power generation - Google Patents
Power supply device for radio sensor network node based on piezoelectric porcelain vibration power generation Download PDFInfo
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- CN201054553Y CN201054553Y CN 200720079757 CN200720079757U CN201054553Y CN 201054553 Y CN201054553 Y CN 201054553Y CN 200720079757 CN200720079757 CN 200720079757 CN 200720079757 U CN200720079757 U CN 200720079757U CN 201054553 Y CN201054553 Y CN 201054553Y
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Abstract
The utility model relates to a wireless transducer network node power supply device based on piezoelectricity ceramic vibration generating. The device consists of a piezoelectricity transducer (11), an electric quantity collecting device (12) and a piezoelectricity vibration power (13) communicated in order. The electric quantity collecting device (12) comprises a full bridge commutating circuit (6), a short period capacitance (7) and a voltage regulator tube (8). The piezoelectricity vibration power (13) comprises a DC/DC convertor (9) and a long period capacitance (10). The vibrated mechanical energy can be converted into electric energy through the piezoelectricity transducer (11) and then forms the transformed piezoelectricity vibration power (13) through commutating and energy storing by the electric quantity collecting device (12) so as to supply power to the wireless transducer network node. The device adopts optimized circuit design, fully considers the power consumption of the control device, can convert the vibration energy in the environment into electric energy, and can realize the maximization of net output power so as to provide power to the node with comparatively small power.
Description
1. technical field
The utility model relates to a kind of piezoelectric ceramic electric supply installation based on vibrating power-generation.This device has taken into full account the power consumption of control device, by optimizing circuit design, makes electric supply installation the vibrational energy in the environment can be converted to electric energy, and can realize the net power output maximization, for the wireless sensor network node of low-power consumption provides power supply.
2. background technology
At present, the piezoelectric effect that known piezoelectric vibration electric supply installation is based on piezoelectric realizes, by direct piezoelectric effect, the stress that is added on the piezoelectric is converted into electric energy, thereby the vibrational energy in the environment is converted to electric energy.
Compare with traditional small power generation technology, the vibrating power-generation technology of piezoelectric element has many advantages: vibration source is extensively to exist in environment, but the overwhelming majority does not all obtain utilizing; The vibrating power-generation technology is applicable to the occasion that has mechanical oscillation, and vibration source is easy to obtain, and cleaning is lasting, is used in the rugged environment, and is non-maintaining stronger; The energy density of piezoelectric is bigger, and energy conversion efficiency is preferably arranged, and does not have the relative motion of contact surface, does not therefore have wearing and tearing, and reliability easily guarantees.
The voltage that the piezoelectric vibration electric supply installation produces when the vibration of vibration source is not strong is fainter usually, only when the vibration of vibration source is very strong, just can produce higher voltage, so the output voltage of piezoelectric power supplies need pass through electric quantity acquisition, rectification, transformation and voltage stabilizing ability normally for the external device (ED) electricity consumption.The piezoelectric vibration electric supply installation of general vibration is formed and is comprised piezoelectric patches, rectification circuit, short-term storage electric capacity.
But conventional piezoelectric pottery (as PZT and PT etc.) has frangible shortcoming, is easy to rupture under the alternate stress effect that mechanical oscillation cause, and life-span of sensing node is had fatal influence.Piezoelectric polymer material (as PVDF) is flexible good, but piezoelectric modulus is low and the polarization difficulty.The electric energy that a lot of piezoelectric vibration electric supply installations produce is fainter, can not normally be the external device (ED) power supply.Xi'an Communications University has applied for patent " automobile vibrational energy piezo-electric generating device " (application number is 200420086151.5), this patent utilization automobile vibrational energy piezo-electric generating device, piezo-electric device is placed automobile suspension system, utilize vibrational energy to produce electric energy, and stored and utilize.This utility model patent can provide new energy source, be mainly used in automotive field, especially for electric automobile and hybrid vehicle, but because oscillation intensity is big, the generated output height, be primarily aimed at powerful power device, do not consider the power consumption of electric supply installation, also do not relate to the DC/DC conversion.In relating to the DC/DC converter, generally adopt AC power (AC), inductance element and rectifier circuit series connection form, but do not relate to the energy conversion efficiency problem.General piezoelectric ceramic vibration electric supply installation piezoelectric ceramic (as PZT and PT etc.) has frangible, and the electric energy power of generation differs, and loss is bigger, does not carry out the DC/DC conversion, and the power available of low-power consumption can not be provided for wireless sensor network node.
3. summary of the invention
Have frangible in order to overcome existing piezoelectric ceramic vibration electric supply installation piezoelectric ceramic (as PZT and PT etc.), the electric energy power that produces differs, loss is bigger, does not carry out the DC/DC conversion, and the deficiency of the power available of low-power consumption can not be provided for wireless sensor network node.The utility model provides a kind of piezoelectric ceramic electric supply installation of vibrating power-generation, this electric supply installation can be converted to electric energy with the vibrational energy in the environment, especially by optimizing circuit design, take into full account the power consumption of control device, thereby make the piezoelectricity electric supply installation realize net power output maximization, for the wireless sensor network node of low-power consumption provides power supply.
The technical scheme that its technical problem that solves the utility model adopts is: utilize all higher PZT-5 piezoelectric of piezoelectric modulus and toughness to realize collecting electric energy in conjunction with rectification and DC/DC technology from mechanical oscillation, and use as the wireless sensor network node electric supply installation, take into full account the power consumption of control device, be target to the maximum with net power output.
The utility model is made up of the PZT (piezoelectric transducer) (11) that mechanical energy is converted to electric energy, electric weight gathering-device (12), piezoelectric vibration power supply (13).Wherein PZT (piezoelectric transducer) (11) is made up of oscillating mass piece (2), piezoelectric patches (1), cantilever beam (4), electrode layer (3), lead (5).
PZT (piezoelectric transducer) adopts cantilever beam structure in the utility model, and the advantage of this structure mainly contains: 1) the single order resonance frequency is lower; 2) alternate stress that is subjected to of piezoelectric patches is bigger.In order to improve mean stress, PZT (piezoelectric transducer) is made into prismatic shape.PZT (piezoelectric transducer) is made up of two piezoelectric patches (1) serial or parallel connection, the comparing of the transducer that the transducer that piezoelectric patches is composed in series and single piezoelectric patches are formed, and output voltage increases and is twice, and electric current is constant; Comparing of the transducer that the transducer that piezoelectric patches composes in parallel and single piezoelectric patches are formed, output voltage is constant, and electric current is original twice.Can select connecting mode according to the power of vibration source energy in the environment, the output voltage of PZT (piezoelectric transducer) and the input voltage of DC/DC transducer (9) are complementary.Wherein the material of piezoelectric patches adopts the piezoelectric ceramic of PZT5 series, and being clipped in piezoelectric layer middle is a spring steel plate cantilever beam (4), and two piezoelectric patches skins have all plated one deck electrode layer, draw two leads from electrode layer and lead to rectification circuit.Rectification circuit adopts the form of full bridge rectifier (6), have the function of boosting concurrently, direct current after the rectification is by short period electric capacity (7) storage, after voltage-stabiliser tube (8) voltage stabilizing, enter DC/DC transducer (9) and change, the purpose of conversion mainly is in order to obtain the voltage of wireless sensor network node operate as normal.By a long period electric capacity (10) storage, is the wireless sensor network node power supply by the electric weight after the conversion of DC/DC (9) transducer then.
In the utility model, described electrode (3) material that is used for the PZT (piezoelectric transducer) of vibrating power-generation is nickel or silver.
In the utility model, the described material that is used for the mass (2) of the PZT (piezoelectric transducer) of vibrating power-generation is tungsten alloy (wherein tungsten accounts for 90%).
In the utility model, described piezoelectric patches (1) material that is used for the PZT (piezoelectric transducer) of vibrating power-generation is the piezoelectric ceramic of PZT5 series.
In the utility model, described cantilever beam (4) material that is used for the PZT (piezoelectric transducer) of vibrating power-generation is a spring steel plate.
In the utility model, described DC/DC transducer (9) model adopts LT1934-1, this transducer can carry out work under the state of low current, output voltage that can stabilized power supply, has low in power consumption, DC/DC transducer (9) require input voltage between 3V to 30 volt, output voltage is at 3.3 volts, it can realize that the suitable DC/DC power supply (9) of identical function has LT1934, MAX1722, MAX1723, MAX 1724 models.
In the utility model, rectifier diode adopts Schottky diode in the described full bridge rectifier (6), model is RB420D, this Schottky diode has low-power consumption, superfast characteristics, extremely lack its reverse recovery time (may diminish to several nanoseconds), forward conduction voltage drop only is 0.4V, and its Schottky diode that can realize that identical function is suitable for has RB411D, RB421D, RB425D, RB450F model.
In the utility model, short period electric capacity (7) adopts the TRJC107K016RNJ model in the described electric quantity collector (12), the electric capacity of this model is the bigger tantalum electric capacity of capacity, capacity with 100 μ F/16V, effect is to carry out the electric weight storage, provide conversion and operating voltage to the DC/DC transducer, the 100 μ F/16V tantalum electric capacity that its short period electric capacity (7) that can realize that identical function is suitable for has Panasonic (Panasonic), Kemet (Ji Mei), Sanyo (Sanyo) company to produce.
In the utility model; voltage-stabiliser tube (8) adopts the IN4751 model in the described electric quantity collector (12); the voltage-stabiliser tube of this model has the voltage regulation result of 30V; when operating voltage during far below 30V this voltage-stabiliser tube inoperative; just generation effect when being higher than 30 volts; this voltage-stabiliser tube effect is that the DC/DC transducer is protected, and prevents that it from damaging because of input voltage is too high.
In the utility model, long period electric capacity (10) adopts the TRJC107K006RNJ model in the described piezoelectric vibration power supply (13), the electric capacity of this model has the capacity of 100 μ F/6V, effect is that the DC/DC converter output voltage is carried out the electric weight storage, for external device (ED) (sensing node) provides operating voltage, the 100 μ F/6V tantalum electric capacity that its long period electric capacity (10) that can realize that identical function is suitable for has Panasonic (Panasonic), Kemet (Ji Mei), Sanyo (Sanyo) company to produce.
In the utility model, R5 and R6 adopt the big resistance of 2.4M Ω and 5.1M Ω respectively in described DC/DC transducer (9) peripheral circuit, its effect is the operating state that is connected to shutdown pin control DC/DC transducer (9) after the dividing potential drop, make DC/DC transducer (9) power consumption under the situation that satisfies the conversion needs reach minimum, the selection of R5 and R6 should be satisfied 2.3≤R6 * 3.6/ (R5+R6)≤34.
In the utility model, R11 adopts the adjustable resistance of 1M Ω in described DC/DC transducer (9) peripheral circuit, R12 adopts the resistance of 1M Ω, effect is the work period that is connected to FB pin control DC/DC transducer after the dividing potential drop, the work period of DC/DC transducer is to regulate by adjustable resistance R11, and the selection of R11 and R12 should be satisfied R12=R11 (V
OUT/ 1.25-1).
The beneficial effects of the utility model are, a kind of power supply technique by the extraneous vibration generating is provided, promptly utilize the high-performance piezoelectricity oscillating generating set of ambient vibration energy generating, make some power consumption wireless sensor network nodes of operation in adverse circumstances that stable power supply arranged, its power source life is long, do not need to safeguard, can expand the scope of application of radio sensing network greatly, and provide support for the microminiaturization of radio sensing network node.Tungsten alloy has bigger density, and smaller volume tungsten alloy mass can produce bigger inertia force, and elastic steel sheet has better deformation characteristics, the longitudinal pressure of mass can be converted to horizontal stress to greatest extent, thereby produces maximum output voltage.By design, make the PZT (piezoelectric transducer) of vibrating power-generation have higher energy conversion efficiency, solve the faint problem of power supply output energy, and can under the fainter situation of vibration source, keep stable output.Used DC/DC transducer (9) in this utility model, be enhanced than the transformation efficiency that directly stores storage capacitor without DC/DC transducer (9) into.
4. description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is a structure principle chart of the present utility model.
Fig. 2 is Conversion of energy of the present utility model and transfer route.
Fig. 3 is the end view of the utility model PZT (piezoelectric transducer).
Fig. 4 is the vertical view of the utility model PZT (piezoelectric transducer).
Fig. 5 is circuit theory diagrams of the present utility model.
Among the figure: the 1st, piezoceramics layer, the 2nd, mass, the 3rd, electrode, the 4th, cantilever beam, 5 leads, 6 is full bridge rectifier, and 7 is short period electric capacity, and 8 is voltage-stabiliser tube, and 9 is the DC/DC transducer, 10 is long period electric capacity, and 11 is PZT (piezoelectric transducer), and 12 is the electric weight gathering-device, and 13 are the piezoelectric vibration power supply.
5. embodiment
The embodiment of the wireless sensor network node electric supply installation that vibration is generated electricity based on piezoelectric ceramic such as Fig. 1-shown in Figure 5.In Fig. 3, the PZT (piezoelectric transducer) in this execution mode (11) comprises electrode (3), lead (5), piezoelectric patches (1), cantilever beam (4) and a mass (2) that produces inertia force; The working method of PZT (piezoelectric transducer) (11) is: produce inertia force by mass (2) vibration, horizontal generation alternate stress at cantilever beam (4), utilize the direct piezoelectric effect of piezoelectric patches (1), produce electric energy, electric energy is imported electric weight gathering-device (12) by lead (5).In Fig. 2, electric weight gathering-device (12) comprises full bridge rectifier (6), short period electric capacity (7) and voltage-stabiliser tube (8).Its concrete work implementation is: wherein full bridge rectifier (6) effect is that alternating current is converted into direct current, and boosting is arranged; Direct current after the rectification carries out the electric weight storage by short period electric capacity (7), for the DC/DC transducer provides conversion and operating voltage.Short period electric capacity (7) order is electrically connected a voltage-stabiliser tube (8), and its burning voltage is 30V, and inoperative during far below 30V at voltage, only just generation effect about 30 works to protect DC/DC converter (9).Piezoelectric vibration power supply (13) is by DC/DC transducer (9), and long period electric capacity (10) is formed.Its concrete work implementation is: the piezoelectric vibration power supply changes into the mechanical energy in the environment can be for the electric energy of loaded work piece, the mechanical energy that mainly is vibration is converted into electric energy by PZT (piezoelectric transducer) (11), by electric quantity collector (12) rectification, storage, the direct current after the rectification enters the V of DC/DC power supply (9)
InPort by connecing the shutdown pin behind the big electric resistance partial pressure, is controlled the operating state of DC/DC transducer, and converting electrical energy is stored in the longer-term storage electric capacity (10) the most at last, becomes the power supply that is fit to wireless sensor network node work.The utility model adopts the mentality of designing of low-power consumption, and utilization PZT piezoelectric has realized collecting electric energy in conjunction with rectification and DC/DC technology from mechanical oscillation, for wireless sensor network node provides power supply.
Claims (10)
1. wireless sensor network node electric supply installation based on piezoelectric ceramic vibration generating; by PZT (piezoelectric transducer) (11); electric weight gathering-device (12) and piezoelectric vibration power supply (13) order are electrically connected; it is characterized in that piezoelectric vibration power supply (13) comprises DC/DC transducer (9) and long period electric capacity (10); electric weight gathering-device (12) comprises full bridge rectifier (6); short period electric capacity (7) and voltage-stabiliser tube (8); PZT (piezoelectric transducer) (11) comprises two electrodes (3); two leads (5); two piezoelectric patches (1); a cantilever beam (4); and mass (2) that produces acceleration; the mechanical energy of vibration is converted into electric energy by PZT (piezoelectric transducer) (11); through electric weight gathering-device (12) rectification; transformation; energy storage; the final piezoelectric vibration power supply (13) that forms is the wireless sensor network node power supply; DC/DC transducer (9) in the piezoelectric vibration power supply (13) can be by its shutdown pin of control; regulate the operating state of DC/DC transducer (9); make electric supply installation that maximum power output be arranged, voltage-stabiliser tube (8) plays protection DC/DC transducer (9).
2. according to the described wireless sensor network node electric supply installation based on piezoelectric ceramic vibration generating of claim 1, the material that it is characterized in that described electrode (3) is nickel or silver.
3. according to the described wireless sensor network node electric supply installation based on piezoelectric ceramic vibration generating of claim 1, it is characterized in that the material of described mass (2) is a tungsten alloy, wherein tungsten accounts for 90%.
4. according to the described electric supply installation of claim 1, it is characterized in that described piezoelectric patches (1) is the piezoelectric ceramic of PZT5 series based on piezoelectric ceramic vibration generating.
5. according to the described wireless sensor network node electric supply installation of claim 1, it is characterized in that described cantilever beam (4) material is an elastic steel sheet based on piezoelectric ceramic vibration generating.
6. according to the described wireless sensor network node electric supply installation of claim 1 based on piezoelectric ceramic vibration generating, it is characterized in that described DC/DC transducer (9) adopts LT1934-1, the DC/DC transducer require input voltage at 3V between the 30V, output voltage is 3.3V, can realize that the DC/DC transducer that identical function is suitable for has LT1934, MAX1722, MAX 1723, MAX 1724 models.
7. according to the described wireless sensor network node electric supply installation of claim 1, it is characterized in that described voltage-stabiliser tube (8) adopts the 30V voltage-stabiliser tube of 1N4751 model based on piezoelectric ceramic vibration generating.
8. according to the described wireless sensor network node electric supply installation of claim 1 based on piezoelectric ceramic vibration generating, it is characterized in that rectifier diode adopts Schottky diode in the described full bridge rectifier (6), model is RB420D, its reverse recovery time is extremely short, can reach several nanoseconds, forward conduction voltage drop only is 0.4V, can realize that the Schottky diode that identical function is suitable for has RB411D, RB421D, RB425D, RB450F model.
9. according to the described wireless sensor network node electric supply installation of claim 1 based on piezoelectric ceramic vibration generating, it is characterized in that described short period electric capacity (7) adopts 100 μ F/16V tantalum electric capacity of TRJC107K016RNJ model, can realize the 100 μ F/16V tantalum electric capacity that the suitable short period electric capacity (7) of identical function has Panasonic, Kemet, Sanyo company to produce.
10. according to the described wireless sensor network node electric supply installation of claim 1 based on piezoelectric ceramic vibration generating, it is characterized in that described long period electric capacity (10) adopts 100 μ F/6V tantalum electric capacity of TRJC107K006RNJ model, can realize the 100 μ F/6V tantalum electric capacity that the suitable long period electric capacity (10) of identical function has Panasonic, Kemet, Sanyo company to produce.
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| CN102148587A (en) * | 2010-02-05 | 2011-08-10 | 边义祥 | Combined type piezoelectric generating set |
| CN102170248A (en) * | 2011-04-22 | 2011-08-31 | 中南大学 | Ambient vibration energy collecting device based on two-DOF (Degree of Freedom) piezoelectric vibrator |
| CN102435327A (en) * | 2011-11-16 | 2012-05-02 | 上海策元实业有限公司 | Wireless temperature monitor of power equipment based on induction energy storage |
| CN101944859B (en) * | 2009-07-09 | 2013-04-17 | 中科力函(深圳)热声技术有限公司 | Piezoelectric ceramic thermoacoustic power generation device |
| CN103762893A (en) * | 2014-01-17 | 2014-04-30 | 江苏联能电子技术有限公司 | Minitype piezoelectric ceramic power source based on impact |
| CN103884744A (en) * | 2012-12-21 | 2014-06-25 | 帕洛阿尔托研究中心公司 | Piezo-powered sensor card and method therefor |
| CN105091941A (en) * | 2015-08-13 | 2015-11-25 | 江苏物联网研究发展中心 | Temperature-humidity-pressure real-time monitoring device based on multi-piezoelectric combined power amplification energy supply function |
| CN107069920A (en) * | 2017-06-16 | 2017-08-18 | 西安工程大学 | A kind of transmission line of electricity energy taking device based on piezoelectric and its take can method |
| CN108204844A (en) * | 2017-12-16 | 2018-06-26 | 太原理工大学 | A kind of level of material for ball mill detection device |
| CN108462404A (en) * | 2018-03-22 | 2018-08-28 | 杭州干城科技有限公司 | Intelligent power supply system based on piezoelectric ceramics vibration environment collection of energy |
| CN108775956A (en) * | 2018-05-24 | 2018-11-09 | 北京科技大学 | A kind of wireless vibration cantilever beam sensor based on piezoelectricity |
| CN111328006A (en) * | 2020-04-28 | 2020-06-23 | 厦门晓意声云科技有限公司 | Wireless sound collection equipment capable of obtaining electricity through vibration |
| CN111405390A (en) * | 2020-03-02 | 2020-07-10 | 浙江依圆节能科技有限公司 | Wireless passive transmitting device for detecting opening and closing states of door and window |
| CN111424722A (en) * | 2020-03-20 | 2020-07-17 | 西安交通大学 | Passive intelligent well lid system based on piezoelectric ceramics and working method thereof |
| CN112581720A (en) * | 2019-09-29 | 2021-03-30 | 中国石油化工股份有限公司 | Intelligent detection and alarm system for operation safety state in limited space |
| CN113364341A (en) * | 2020-12-11 | 2021-09-07 | 广西电网有限责任公司电力科学研究院 | Vibration is from power take-off suitable for intelligent sensor |
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| CN101944859B (en) * | 2009-07-09 | 2013-04-17 | 中科力函(深圳)热声技术有限公司 | Piezoelectric ceramic thermoacoustic power generation device |
| CN102148587A (en) * | 2010-02-05 | 2011-08-10 | 边义祥 | Combined type piezoelectric generating set |
| CN102170248A (en) * | 2011-04-22 | 2011-08-31 | 中南大学 | Ambient vibration energy collecting device based on two-DOF (Degree of Freedom) piezoelectric vibrator |
| CN102170248B (en) * | 2011-04-22 | 2013-11-06 | 中南大学 | Ambient vibration energy collecting device based on two-DOF (Degree of Freedom) piezoelectric vibrator |
| CN102435327A (en) * | 2011-11-16 | 2012-05-02 | 上海策元实业有限公司 | Wireless temperature monitor of power equipment based on induction energy storage |
| CN102435327B (en) * | 2011-11-16 | 2013-03-20 | 上海策元实业有限公司 | Wireless temperature monitor of power equipment based on induction energy storage |
| CN103884744A (en) * | 2012-12-21 | 2014-06-25 | 帕洛阿尔托研究中心公司 | Piezo-powered sensor card and method therefor |
| CN103762893A (en) * | 2014-01-17 | 2014-04-30 | 江苏联能电子技术有限公司 | Minitype piezoelectric ceramic power source based on impact |
| CN103762893B (en) * | 2014-01-17 | 2016-05-11 | 江苏联能电子技术有限公司 | A kind of miniature piezo-ceramic power supply based on impacting |
| CN105091941A (en) * | 2015-08-13 | 2015-11-25 | 江苏物联网研究发展中心 | Temperature-humidity-pressure real-time monitoring device based on multi-piezoelectric combined power amplification energy supply function |
| CN107069920A (en) * | 2017-06-16 | 2017-08-18 | 西安工程大学 | A kind of transmission line of electricity energy taking device based on piezoelectric and its take can method |
| CN107069920B (en) * | 2017-06-16 | 2020-09-22 | 西安工程大学 | Power transmission line energy taking device based on piezoelectric material and energy taking method thereof |
| CN108204844A (en) * | 2017-12-16 | 2018-06-26 | 太原理工大学 | A kind of level of material for ball mill detection device |
| CN108462404A (en) * | 2018-03-22 | 2018-08-28 | 杭州干城科技有限公司 | Intelligent power supply system based on piezoelectric ceramics vibration environment collection of energy |
| CN108775956A (en) * | 2018-05-24 | 2018-11-09 | 北京科技大学 | A kind of wireless vibration cantilever beam sensor based on piezoelectricity |
| CN112581720A (en) * | 2019-09-29 | 2021-03-30 | 中国石油化工股份有限公司 | Intelligent detection and alarm system for operation safety state in limited space |
| CN112581720B (en) * | 2019-09-29 | 2022-09-02 | 中国石油化工股份有限公司 | Intelligent detection and alarm system for operation safety state in limited space |
| CN111405390A (en) * | 2020-03-02 | 2020-07-10 | 浙江依圆节能科技有限公司 | Wireless passive transmitting device for detecting opening and closing states of door and window |
| CN111405390B (en) * | 2020-03-02 | 2022-10-18 | 浙江依圆医疗科技有限公司 | Wireless passive transmitting device for detecting opening and closing states of door and window |
| CN111424722A (en) * | 2020-03-20 | 2020-07-17 | 西安交通大学 | Passive intelligent well lid system based on piezoelectric ceramics and working method thereof |
| CN111328006A (en) * | 2020-04-28 | 2020-06-23 | 厦门晓意声云科技有限公司 | Wireless sound collection equipment capable of obtaining electricity through vibration |
| CN113364341A (en) * | 2020-12-11 | 2021-09-07 | 广西电网有限责任公司电力科学研究院 | Vibration is from power take-off suitable for intelligent sensor |
| CN113992058A (en) * | 2021-10-19 | 2022-01-28 | 浙江中控技术股份有限公司 | Self-generating system, device and method for collecting vibration energy of rotating equipment |
| CN113992058B (en) * | 2021-10-19 | 2024-03-08 | 浙江中控技术股份有限公司 | Self-generating system, apparatus and method for harvesting vibrational energy of rotating equipment |
| CN115372249A (en) * | 2022-06-29 | 2022-11-22 | 西南科技大学 | Conductive nano polymer film internal damage detection unit and device |
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