CN108540014A - A kind of low frequency flexible energy collector and self energizing motion counter - Google Patents

A kind of low frequency flexible energy collector and self energizing motion counter Download PDF

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Publication number
CN108540014A
CN108540014A CN201810457579.2A CN201810457579A CN108540014A CN 108540014 A CN108540014 A CN 108540014A CN 201810457579 A CN201810457579 A CN 201810457579A CN 108540014 A CN108540014 A CN 108540014A
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China
Prior art keywords
cantilever beam
low frequency
permanent magnet
energy collector
flexible energy
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CN201810457579.2A
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Chinese (zh)
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CN108540014B (en
Inventor
李昕欣
李柯利
何启盛
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Shanghai Institute of Microsystem and Information Technology of CAS
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Shanghai Institute of Microsystem and Information Technology of CAS
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02NELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/18Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H02N2/186Vibration harvesters
    • H02N2/188Vibration harvesters adapted for resonant operation

Abstract

A kind of low frequency flexible energy collector of present invention offer and self energizing motion counter, the low frequency flexible energy collector include:Flexible substrate;Supporting block, the supporting block are located in the flexible substrate;The first end of cantilever beam, the cantilever beam is fixed in the supporting block, and the second end of the cantilever beam is free end;Piezoelectric membrane, the piezoelectric membrane are located at the upper surface of the cantilever beam;And permanent magnet, the permanent magnet are located in the flexible substrate below the cantilever beam free end;Wherein, default spacing is equipped between the cantilever beam free end and the permanent magnet.The low frequency flexible energy collector and self energizing motion counter provided through the invention solves the problems, such as that existing wearable energy collecting device generating efficiency under the conditions of low frequency movement is low and power supply instability.

Description

A kind of low frequency flexible energy collector and self energizing motion counter
Technical field
The invention belongs to micromechanics sensory fields, are moved more particularly to a kind of low frequency flexible energy collector and self energizing Counter.
Background technology
Wearable device is in the various micro-system applications such as health care, medical rehabilitation, training and individual equipment It is in great demand, and traditional wearable device is mainly battery powered, which results in the wearable device working time is limited, And battery altering and battery charge and its inconvenience, cannot be satisfied the requirement of " plug and play ".In order to solve this problem, it confesses The wearable energy collecting device of electricity receives more and more attention.
There is researcher to develop a kind of wearable energy collecting device based on triboelectricity recently, electricity when passing through body kinematics Friction induction generates free electron power generation between dielectric material and electrode.But due between dielectric material surface and electrode surface Friction velocity (i.e. body movement speed) have significant impact to the generating efficiency of this energy collecting device, so as to cause its send out Electricity is very unstable;I.e. body movement speed (or frequency) is lower, and strain rate is smaller, and generated output is also lower.And work as body When motion frequency is down to 0.5Hz from 3.0Hz, the current peak that this energy collecting device generates then is down to 0.2 μ A from 2.6 μ A, electricity Voltage crest value drops to original 50%, and each electric energy for generating electricity period output has been decayed decades of times.And the movement frequency that human body is common Rate in 1Hz hereinafter, and forms of motion different frequency can also change.As it can be seen that fortune of this energy collecting device in the low frequency of human body Not only generating efficiency is low under the conditions of dynamic but also power generation is unstable, these characteristics are all unfavorable for the continued smooth of wearable electronic system Power supply.
In consideration of it, it is necessary to design a kind of new low frequency flexible energy collector and self energizing motion counter to solve This problem.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of low frequency flexible energy collectors With self energizing motion counter, for solving that existing wearable energy collecting device low frequency generating efficiency is low and power supply instability Problem.
In order to achieve the above objects and other related objects, the present invention provides a kind of low frequency flexible energy collector, described low Frequency flexible energy collector includes:
Flexible substrate;
Supporting block, the supporting block are located in the flexible substrate;
The first end of cantilever beam, the cantilever beam is fixed in the supporting block, and the second end of the cantilever beam is freely End;
Piezoelectric membrane, the piezoelectric membrane are located at the upper surface of the cantilever beam;And
Permanent magnet, the permanent magnet are located in the flexible substrate below the cantilever beam free end;
Wherein, default spacing is equipped between the cantilever beam free end and the permanent magnet.
Preferably, the energy of the low frequency flexible energy collector derives from limb motion, and limb motion is converted to The high-frequency resonant of the cantilever beam generates electricity.
Preferably, within a limb motion period, the low frequency flexible energy collector carries out high-frequency resonant twice and sends out Electricity.
Preferably, when limbs are stretched to elongate the flexible substrate, the cantilever beam free end and the permanent magnet point It opens, the cantilever beam carries out high-frequency resonant power generation;When limbs bounce back so that the flexible substrate is sprung back, the cantilever beam is free End is attracted with the permanent magnet, and the cantilever beam carries out resonant electrical generation with higher resonant frequency.
Preferably, the low frequency energy collector further includes the support between the flexible substrate and the permanent magnet Block.
Preferably, the piezoelectric membrane includes:Lower electrode is located at the piezoelectric material of the lower electrode top, Yi Jiwei Top electrode in the piezoelectric material upper surface, wherein the top electrode and the lower electrode are connected by conducting wire and external load It connects.
The present invention also provides a kind of low frequency flexible energy collector, the low frequency flexible energy collector includes:
Flexible substrate;
Supporting block, the supporting block are located in the flexible substrate;
The first end of cantilever beam, the cantilever beam is fixed in the supporting block, and the second end of the cantilever beam is freely End;
Piezoelectric membrane, the piezoelectric membrane are located at the upper surface of the cantilever beam;And
First permanent magnet and the second permanent magnet, first permanent magnet and second permanent magnet are located at the cantilever In the flexible substrate below the two corners of beam free end;
Wherein, the first default spacing is equipped between first permanent magnet and second permanent magnet, the cantilever beam is certainly The second default spacing is equipped between first permanent magnet and second permanent magnet respectively by holding.
Preferably, the energy of the low frequency flexible energy collector derives from limb motion, and limb motion is converted to The high-frequency resonant of the cantilever beam generates electricity.
Preferably, within a limb motion period, the low frequency flexible energy collector carries out high-frequency resonant twice and sends out Electricity.
Preferably, when limbs are stretched to elongate or widen the flexible substrate, the cantilever beam free end and described the One permanent magnet and second permanent magnet separate, and the cantilever beam carries out high-frequency resonant power generation;When limbs bounce back so that described soft Property substrate rebound when, the cantilever beam free end and first permanent magnet and second permanent magnet are attracted, the cantilever beam Resonant electrical generation is carried out with higher resonant frequency.
Preferably, the low frequency energy collector further include between the flexible substrate and first permanent magnet and Supporting block between the flexible substrate and second permanent magnet.
Preferably, the piezoelectric membrane includes:Lower electrode is located at the piezoelectric material of the lower electrode top, Yi Jiwei Top electrode in the piezoelectric material upper surface, wherein the top electrode and the lower electrode are connected by conducting wire and external load It connects.
The present invention also provides a kind of self energizing motion counter, the self energizing motion counter includes:
Any one of them low frequency flexible energy collector as above, as the feeder ear of the self energizing motion counter, And based on limb motion to generate count signal and export;
Adder is connect with the low frequency flexible energy collector, for receiving the low frequency flexible energy collector hair The count signal sent, and the existing step count information stored in memory is read, and the counting is believed based on having step count information Number carry out accumulation process, with realize self energizing movement count;
Memory is connect with the adder, and the accumulation result for being exported to the adder stores.
As described above, the low frequency flexible energy collector and self energizing motion counter of the present invention, have below beneficial to effect Fruit:
The human body limb movement of low frequency can be converted to cantilever beam by the low frequency flexible energy collector through the invention High-frequency resonant generates electricity, and high-frequency resonant twice not only can be achieved within a limb motion period and generate electricity, but also more due to flexible liner Influence very little of the horizontal stretch at bottom to the power generation of the vertical resonant of cantilever beam so that sub- hertz to several hertz limb motion frequently Within the scope of rate, the low frequency flexible energy collector can generate the electric energy of stabilization, and solving existing energy collecting device can only be Relatively stable electric energy is generated in relatively narrow frequency range, the problem that generating efficiency is low in low frequency and power generation is unstable.
The self energizing motion counter that the low frequency flexible energy collector is constituted through the invention can not only be realized certainly Power supply can more realize the electricity that movement counts, i.e., is exported by the low frequency flexible energy collector on the basis of self-powered It presses pulse to realize tally function, solves the problems, such as that initial data loss easily occurs in existing self energizing method of counting so that count As a result more accurate.
Description of the drawings
Fig. 1 is shown as the structural schematic diagram of energy collecting device described in the embodiment of the present invention one.
Fig. 2 is shown as the structural schematic diagram that energy collecting device described in the embodiment of the present invention one is in first time generating state.
Fig. 3 is shown as the structural schematic diagram that energy collecting device described in the embodiment of the present invention one is in second of generating state.
Fig. 4 a are shown as the time domain voltage signal that energy collecting device generates under low frequency condition described in the embodiment of the present invention one Figure, Fig. 4 b are shown as the schematic diagram of energy collecting device tensile test described in the embodiment of the present invention one.
Fig. 5 is shown as the structural schematic diagram of energy collecting device described in the embodiment of the present invention two.
Fig. 6 is shown as the system block diagram based on self energizing motion counter described in the embodiment of the present invention three.
Component label instructions
100 energy collecting devices
10 flexibilities are sunk to the bottom
20 supporting blocks
30 cantilever beams
40 piezoelectric membranes
50 permanent magnets
51 first permanent magnets
52 second permanent magnets
200 adders
300 memories
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this explanations by particular specific embodiment below Content disclosed by book understands other advantages and effect of the present invention easily.
It please refers to Fig.1 to Fig. 6.It should be clear that structure, ratio, size etc. depicted in this specification institute accompanying drawings, only to Coordinate the revealed content of specification, so that those skilled in the art understands and reads, being not limited to the present invention can be real The qualifications applied, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size It is whole, in the case where not influencing the effect of present invention can be generated and the purpose that can reach, should all still fall in disclosed skill Art content obtains in the range of capable of covering.Meanwhile in this specification it is cited as "upper", "lower", "left", "right", " centre " and The term of " one " etc. is merely convenient to being illustrated for narration, rather than to limit the scope of the invention, relativeness It is altered or modified, in the case where changing technology contents without essence, when being also considered as the enforceable scope of the present invention.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of low frequency flexible energy collector, the low frequency flexible energy collector 100 include:
Flexible substrate 10;
Supporting block 20, the supporting block 20 are located in the flexible substrate 10;
The first end of cantilever beam 30, the cantilever beam 30 is fixed in the supporting block 20, and the second of the cantilever beam 30 End is free end;
Thin 40 film of piezoelectricity, the piezoelectric membrane 40 are located at the upper surface of the cantilever beam 30;And
Permanent magnet 50, the permanent magnet 50 are located in the flexible substrate 10 below 30 free end of the cantilever beam;
Wherein, default spacing L is equipped between 30 free end of the cantilever beam and the permanent magnet 50.
As an example, as described in Figure 1, the low frequency energy collector 100 further includes being located at the flexible substrate 10 and institute State the supporting block 20 between permanent magnet 50.
As an example, the length of the flexible substrate 10 is 2cm~20cm, width is 0.4cm~2cm, and thickness is 0.1mm~2mm.Preferably, in the present embodiment, the material of the flexible substrate 10 is dimethyl silicone polymer (PDMS), Size is 60 × 15 × 1.5mm3
As an example, the material of the supporting block 20 is glass, silicon or metal.Preferably, in the present embodiment, the branch The material of bracer 20 is glass.
It is bonded as an example, can be realized by sticky stuff between the flexible substrate 10 and the supporting block 20, also may be used To be directly bonded.Preferably, in the present embodiment, the supporting block 20 is directly adhered in the flexible substrate 10;I.e. pair After PDMS carries out oxygen plasma treatment so that it is bonded with glass by the way that chemical bond is spontaneous, to realize stronger bonding.
As an example, the material of the cantilever beam 30 is the gold that ferrimagnet or its free end are bonded with ferrimagnet Belong to material;The length of the cantilever beam 30 is 5mm~20mm, width of same size, thickness with the piezoelectric membrane 40 For 10um~100un.Preferably, in the present embodiment, the cantilever beam 30 is nickel cantilever beam, and the length of 11mm, width is 4.5mm, thickness 80um, Young's modulus 200GPa, density 7500kg/m3
As an example, the piezoelectric membrane 40 is adhered to 30 upper surface of the cantilever beam by conductive silver paste;Wherein, described Piezoelectric membrane 40 includes:Lower electrode is located at the piezoelectric material of the lower electrode top, and is located at the piezoelectric material upper table The top electrode in face, wherein the top electrode and the lower electrode are connect by conducting wire with external load.
Specifically, the material of the piezoelectric material is Kynoar (PVDF) or lead titanate piezoelectric ceramics (PZT), Length is 2mm~10mm, and width is of same size with the cantilever beam 30, and thickness is 10um~200um.Preferably, exist In the present embodiment, the material of the piezoelectric material is PZT, the length of 5mm, width 4.5mm, thickness 60um, Young mould Amount is 53GPa, density 8890kg/m3, damped coefficient 0.1, piezoelectric coupling coefficient is -2.8e-10m/V, and dielectric constant is 4500。
Preferably, in the present embodiment, the material of the permanent magnet 50 is neodymium iron boron magnetic body.
As an example, the energy of the low frequency flexible energy collector derives from limb motion, limb motion is converted It generates electricity for the high-frequency resonant of the cantilever beam;And within a limb motion period, the low frequency flexible energy collector into High-frequency resonant generates electricity row twice;I.e. when limbs are stretched to elongate the flexible substrate 10,30 free end of the cantilever beam and institute It states permanent magnet 50 to separate, the cantilever beam 30 carries out high-frequency resonant power generation;When limbs bounce back so that the flexible substrate 10 is sprung back When, 30 free end of the cantilever beam is attracted with the permanent magnet 50, and the cantilever beam 30 carries out resonance with higher resonant frequency Power generation.
Specifically, in the initial state, the free end of the cantilever beam 30 is pulled on the permanent magnet 50;When described soft Property substrate 10 when being elongated because of limb motion, the cantilever beam 30 is detached with the permanent magnet 50, and the cantilever beam 30 is total at it Free vibration under vibration frequency (253Hz), and the mechanical energy of vibration is converted to by electric energy output by piezoelectric membrane 40, such as Fig. 2 institutes Show;With the influence of damping, the vibration of the cantilever beam 30 gradually decays, until stopping;When the flexible substrate 10 is because of limbs When movement is sprung back, since the magnetic force between 30 free end of the cantilever beam and the permanent magnet 50 is more than the cantilever beam 30 Restoring force, therefore the cantilever beam 30 is pulled on again on the permanent magnet 50, at this point, the cantilever beam 30 will be with higher humorous Vibration frequency (1852Hz) is vibrated, and the mechanical energy of vibration is converted to electric energy output by piezoelectric membrane 40, such as Fig. 3 institutes Show.As it can be seen that when the energy collecting device to be positioned on human body limb, with the continuous movement of limbs, you can described in realization Energy collecting device release/attracting process repeats;And since the deformation of the flexible substrate is to occur in the horizontal direction, It is vertical with the resonance direction (vertical direction) of the cantilever beam, therefore the high-frequency vibration of the microinching of limbs and cantilever beam is simultaneously It is uncorrelated, that is to say, that the high-frequency vibration of limbs microinching and cantilever beam will not intercouple, and will not influence each other, real Now utilize the high-frequency stabilization power generation that the limb motion of ultra low frequency (sub- hertz is to several hertz) can trigger cantilever beam (hundreds of to several KHz).
Fig. 4 a show under a series of low frequency stretching conditions of 0.5Hz to 5.0Hz, energy collecting device described in the present embodiment The time domain voltage of generation, Fig. 4 b show the test to its pulling force;In order to ensure in entire test, causing flexible liner by stretching The consistency of bottom strain, the amplitude peak of pulling force remain 2.0N;When frequency is reduced to 0.5Hz from 5.0Hz, the peak peak of generation Threshold voltage VP-PIt is always in the stability range of 7.5V to 6.7V;And in this frequency range, transient peak power always exists 1.1mW left and right.As it can be seen that energy collecting device described in the present embodiment can generate more stable, more efficient electric energy.
Embodiment two
As shown in figure 5, a kind of low frequency flexible energy collector is present embodiments provided, the low frequency flexible energy collector 100 include:
Flexible substrate 10;
Supporting block 20, the supporting block 20 are located in the flexible substrate 10;
The first end of cantilever beam 30, the cantilever beam 30 is fixed in the supporting block 20, and the second of the cantilever beam 30 End is free end;
Piezoelectric membrane 40, the piezoelectric membrane 40 are located at the upper surface of the cantilever beam 30;And
First permanent magnet 51 and the second permanent magnet 52, first permanent magnet 51 and second permanent magnet 52 are located at In the flexible substrate 10 below the two corners of 30 free end of the cantilever beam;
Wherein, the first default spacing, the cantilever are equipped between first permanent magnet 51 and second permanent magnet 52 30 free end of beam is equipped with the second default spacing between first permanent magnet 51 and second permanent magnet 52 respectively.
As an example, the low frequency energy collector 100 further includes being located at the flexible substrate 10 and first permanent magnetism Supporting block 20 between body 51 and between the flexible substrate 10 and second permanent magnet 52.
As an example, the length of the flexible substrate 10 is 2cm~20cm, width is 0.4cm~2cm, and thickness is 0.1mm~2mm.Preferably, in the present embodiment, the material of the flexible substrate 10 is dimethyl silicone polymer (PDMS), Size is 60 × 15 × 1.5mm3
As an example, the material of the supporting block 20 is glass, silicon or metal.Preferably, in the present embodiment, the branch The material of bracer 20 is glass.
It is bonded as an example, can be realized by sticky stuff between the flexible substrate 10 and the supporting block 20, also may be used To be directly bonded.Preferably, in the present embodiment, the supporting block 20 is directly adhered in the flexible substrate 10;I.e. pair After PDMS carries out oxygen plasma treatment so that it is bonded with glass by the way that chemical bond is spontaneous, to realize stronger bonding.
As an example, the material of the cantilever beam 30 is the gold that ferrimagnet or its free end are bonded with ferrimagnet Belong to material;The length of the cantilever beam 30 is 5mm~20mm, width of same size, thickness with the piezoelectric membrane 40 For 10um~100un.Preferably, in the present embodiment, the cantilever beam 30 is nickel cantilever beam, the length of 11mm, width For 4.5mm, thickness 80um, Young's modulus 200GPa, density 7500kg/m3
As an example, the piezoelectric membrane 40 is adhered to 30 upper surface of the cantilever beam by conductive silver paste;Wherein, described Piezoelectric membrane 40 includes:Lower electrode is located at the piezoelectric material of the lower electrode top, and is located at the piezoelectric material upper table The top electrode in face, wherein the top electrode and the lower electrode are connect by conducting wire with external load.
Specifically, the material of the piezoelectric material is Kynoar (PVDF) or lead titanate piezoelectric ceramics (PZT), Length is 2mm~10mm, and width is of same size with the cantilever beam 30, and thickness is 10um~200um.Preferably, exist In the present embodiment, the material of the piezoelectric material is PZT, the length of 5mm, width 4.5mm, thickness 60um, Young mould Amount is 53GPa, density 8890kg/m3, damped coefficient 0.1, piezoelectric coupling coefficient is -2.8e-10m/V, and dielectric constant is 4500。
Preferably, in the present embodiment, the material of first permanent magnet 51 and second permanent magnet 52 is neodymium iron Boron magnet.
As an example, the energy of the low frequency flexible energy collector derives from limb motion, limb motion is converted It generates electricity for the high-frequency resonant of the cantilever beam;And within a limb motion period, the low frequency flexible energy collector into High-frequency resonant generates electricity row twice;I.e. when limbs are stretched to elongate or widen the flexible substrate 10, the cantilever beam 30 is freely End is separated with first permanent magnet 51 and second permanent magnet 52, and the cantilever beam 30 carries out high-frequency resonant power generation;Work as limb When body bounces back so that the flexible substrate 10 is sprung back, 30 free end of the cantilever beam and first permanent magnet 51 and described second Permanent magnet 52 is attracted, and the cantilever beam 30 carries out resonant electrical generation with higher resonant frequency.
Specifically, in the initial state, the free end of the cantilever beam 30 is pulled on first permanent magnet 51 and described On second permanent magnet 52;When the flexible substrate 10 is elongated or widens because of limb motion, the cantilever beam 30 and described the One permanent magnet 51 and second permanent magnet 52 separation, the free vibration under its resonant frequency (253Hz) of the cantilever beam 30, and The mechanical energy of vibration is converted into electric energy output by piezoelectric membrane 40;With the influence of damping, the vibration of the cantilever beam 30 Gradually decaying, until stopping;When the flexible substrate 10 is sprung back because of limb motion, due to 30 free end of the cantilever beam Magnetic force between first permanent magnet 51 and second permanent magnet 52 is more than the restoring force of the cantilever beam 30, therefore described Cantilever beam 30 is pulled on again on first permanent magnet 51 and second permanent magnet 52, at this point, the cantilever beam 30 will be with Higher resonant frequency (1852Hz) is vibrated, and the mechanical energy of vibration is converted to electric energy output by piezoelectric membrane 40. As it can be seen that when the energy collecting device to be positioned on human body limb, with the continuous movement of limbs, you can realize the energy Collector release/attracting process repeats;And since the deformation of the flexible substrate is to occur in the horizontal direction, with institute The resonance direction (vertical direction) for stating cantilever beam is vertical, therefore the high-frequency vibration of the microinching of limbs and cantilever beam not phase It closes, that is to say, that the high-frequency vibration of limbs microinching and cantilever beam will not intercouple, and will not influence each other, and realize profit It is (hundreds of to thousands of hertz of the high-frequency stabilization power generation that can trigger cantilever beam with the limb motion of ultra low frequency (sub- hertz is to several hertz) Hereby).
It should be noted that being respectively arranged below two permanent magnets by the two corners in the cantilever beam free end, realize It can trigger the height of the low frequency flexible energy collector by flexible substrate deformation at any angle in the horizontal direction Frequency resonant electrical generation, wherein deformation at any angle can be exchanged into the flexible substrate to the flexible substrate in the horizontal direction Along its length or the deformation in its width direction;That is, the low frequency flexible energy acquisition through this embodiment Device solves the problems, such as that existing energy collecting device operative orientation is single, greatly increases, it can be achieved that the multi-direction function of stretching power generation The flexibility of low frequency flexible energy collector application described in the present embodiment.
Embodiment three
As shown in fig. 6, present embodiments providing self energizing motion counter, the self energizing motion counter includes:
Low frequency flexible energy collector 100 as described in embodiment one or embodiment two is moved as the self energizing and is counted The feeder ear of number device, and based on limb motion to generate count signal and export;
Adder 200 is connect with the low frequency flexible energy collector 100, is adopted for receiving the low frequency flexible energy The count signal that storage 100 is sent, and the existing count information stored in memory is read, and based on existing step count information to institute It states count signal and carries out accumulation process, to realize that self energizing movement counts;
Memory is connect with the adder, and the accumulation result for being exported to the adder stores.
Due to the flexible substrate in the horizontal direction on deformation to cantilever beam resonant electrical generation in vertical direction not It influences each other, therefore the low frequency flexible energy collector can generate stable voltage pulse within a limb motion period, and Accurate metering function is realized by voltage pulse;And the voltage pulse that the low frequency flexible energy collector generates can be also institute The power supply of self energizing motion counter is stated, to realize its self energizing.
In conclusion the low frequency flexible energy collector and self energizing motion counter of the present invention, have below beneficial to effect Fruit:
The human body limb movement of low frequency can be converted to cantilever beam by the low frequency flexible energy collector through the invention High-frequency resonant generates electricity, and high-frequency resonant twice not only can be achieved within a limb motion period and generate electricity, but also more due to flexible liner Influence very little of the horizontal stretch at bottom to the power generation of the vertical resonant of cantilever beam so that sub- hertz to several hertz limb motion frequently Within the scope of rate, the low frequency flexible energy collector can generate the electric energy of stabilization, and solving existing energy collecting device can only be Relatively stable electric energy is generated in relatively narrow frequency range, the problem that generating efficiency is low in low frequency and power generation is unstable.
The self energizing motion counter that the low frequency flexible energy collector is constituted through the invention can not only be realized certainly Power supply can more realize the electricity that movement counts, i.e., is exported by the low frequency flexible energy collector on the basis of self-powered It presses pulse to realize tally function, it is easy to be lost to solve the problems, such as that initial data easily occurs in existing self energizing method of counting so that meter Number result is more accurate.
So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe The personage for knowing this technology can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.Cause This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as At all equivalent modifications or change, should by the present invention claim be covered.

Claims (13)

1. a kind of low frequency flexible energy collector, which is characterized in that the low frequency flexible energy collector includes:
Flexible substrate;
Supporting block, the supporting block are located in the flexible substrate;
The first end of cantilever beam, the cantilever beam is fixed in the supporting block, and the second end of the cantilever beam is free end;
Piezoelectric membrane, the piezoelectric membrane are located at the upper surface of the cantilever beam;And
Permanent magnet, the permanent magnet are located in the flexible substrate below the cantilever beam free end;
Wherein, default spacing is equipped between the cantilever beam free end and the permanent magnet.
2. low frequency flexible energy collector according to claim 1, which is characterized in that the low frequency flexible energy collector Energy derive from limb motion, by limb motion be converted to the cantilever beam high-frequency resonant generate electricity.
3. low frequency flexible energy collector according to claim 2, which is characterized in that within a limb motion period, The low frequency flexible energy collector carries out high-frequency resonant twice and generates electricity.
4. low frequency flexible energy collector according to claim 3, which is characterized in that when limbs stretching, extension is described soft to elongate Property substrate when, the cantilever beam free end and the permanent magnet separate, and the cantilever beam carries out high-frequency resonant power generation;When limbs return When contracting so that the flexible substrate is sprung back, the cantilever beam free end is attracted with the permanent magnet, and the cantilever beam is with higher Resonant frequency carries out resonant electrical generation.
5. low frequency flexible energy collector according to claim 1, which is characterized in that the low frequency energy collector also wraps Include the supporting block between the flexible substrate and the permanent magnet.
6. low frequency flexible energy collector according to claim 1, which is characterized in that the piezoelectric membrane includes:Lower electricity Pole is located at the piezoelectric material of the lower electrode top, and the top electrode positioned at the piezoelectric material upper surface, wherein institute It states top electrode and the lower electrode is connect by conducting wire with external load.
7. a kind of low frequency flexible energy collector, which is characterized in that the low frequency flexible energy collector includes:
Flexible substrate;
Supporting block, the supporting block are located in the flexible substrate;
The first end of cantilever beam, the cantilever beam is fixed in the supporting block, and the second end of the cantilever beam is free end;
Piezoelectric membrane, the piezoelectric membrane are located at the upper surface of the cantilever beam;And
First permanent magnet and the second permanent magnet, first permanent magnet and second permanent magnet are located at the cantilever beam certainly By in the flexible substrate below the two corners held;
Wherein, the first default spacing, the cantilever beam free end are equipped between first permanent magnet and second permanent magnet The second default spacing is equipped between first permanent magnet and second permanent magnet respectively.
8. low frequency flexible energy collector according to claim 7, which is characterized in that the low frequency flexible energy collector Energy derive from limb motion, by limb motion be converted to the cantilever beam high-frequency resonant generate electricity.
9. low frequency flexible energy collector according to claim 8, which is characterized in that within a limb motion period, The low frequency flexible energy collector carries out high-frequency resonant twice and generates electricity.
10. low frequency flexible energy collector according to claim 9, which is characterized in that when limbs are stretched to elongate or draw When the width flexible substrate, the cantilever beam free end is separated with first permanent magnet and second permanent magnet, described outstanding Arm beam carries out high-frequency resonant power generation;When limbs bounce back so that the flexible substrate spring back when, the cantilever beam free end with it is described First permanent magnet and second permanent magnet are attracted, and the cantilever beam carries out resonant electrical generation with higher resonant frequency.
11. low frequency flexible energy collector according to claim 7, which is characterized in that the low frequency energy collector is also Between including between the flexible substrate and first permanent magnet and the flexible substrate and second permanent magnet Supporting block.
12. low frequency flexible energy collector according to claim 7, which is characterized in that the piezoelectric membrane includes:Lower electricity Pole is located at the piezoelectric material of the lower electrode top, and the top electrode positioned at the piezoelectric material upper surface, wherein institute It states top electrode and the lower electrode is connect by conducting wire with external load.
13. a kind of self energizing motion counter, which is characterized in that the self energizing motion counter includes:
Such as claim 1 to 6 or 7 to 12 any one of them low frequency flexible energy collectors, moves and count as the self energizing The feeder ear of number device, and based on limb motion to generate count signal and export;
Adder is connect with the low frequency flexible energy collector, for receiving the low frequency flexible energy collector transmission Count signal, and read the existing step count information that stores in memory, and based on have step count information to the count signal into Row accumulation process, to realize that self energizing movement counts;
Memory is connect with the adder, and the accumulation result for being exported to the adder stores.
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