CN109256978A - External charge motivates friction generator and its methods and applications - Google Patents
External charge motivates friction generator and its methods and applications Download PDFInfo
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- CN109256978A CN109256978A CN201811366474.2A CN201811366474A CN109256978A CN 109256978 A CN109256978 A CN 109256978A CN 201811366474 A CN201811366474 A CN 201811366474A CN 109256978 A CN109256978 A CN 109256978A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
Abstract
The present invention relates to a kind of external charges to motivate friction generator (ECE-TENG), including main TENG, it is characterized by: the generator further includes upper substrate, lower substrate, motivate TENG and charge drive system, the excitation TENG's and main TENG is upper, lower electrode is separately mounted to, on lower substrate, the charge drive system includes voltage doubling rectifing circuit and voltage regulator circuit, the output voltage of the voltage doubling rectifing circuit is higher than input voltage, the input terminal of the voltage doubling rectifing circuit is respectively to the electrode of connection excitation TENG, the output end of the voltage doubling rectifing circuit is respectively connected to two electrodes of main TENG, the voltage regulator circuit is connected to voltage-multiplying circuit output end to stablize and control driving voltage.External charge excitation friction generator of the invention is novel in design rationally, makes simple, low in cost.
Description
Technical field
The present invention relates to friction nanometer generating fields, and particularly a kind of external charge motivates friction generator (ECE-
TENG)。
Background technique
Friction nanometer power generator (TENG) based on triboelectric effect be widely used for collect such as vibrate, slide, rotation,
Wind energy, water energy, the even ambient mechanicals such as sound energy are to meet the needs of society is to the energy.
The practical application of TENG and commercialization process are largely restricted with its current lower output power, and rub
The output power of nano generator with its density of surface charge that rubs at secondary proportional relation, therefore, for traditional friction nanometer
Generator, a large amount of to work for example: material selection, contact improve, material surface modification, ion implanting and environmental Kuznets Curves etc., all
Bigger output power is obtained to hope in the friction density of surface charge for being dedicated to improving TENG, however restricted and environment and stabilization
Property, extensive practical application can be carried out while being all difficult to realize the big density of surface charge.Therefore, it is necessary to invent a kind of new knot
The friction nanometer power generator of structure obtains the high density of surface charge in atmospheric environment, to realize more extensively and more effective energy
Amount is collected and application.
A kind of energy management of friction nanometer power generator is disclosed in Chinese invention patent application CN201710214174
Circuit and energy management method, energy management circuit include: pulse current control switch, intermediate energy storage element and target energy storage member
Part, wherein pulse current control switch, the movement for two relative motion parts in the friction nanometer power generator make to rub
It wipes after generating induction electrostatic charge between two electrode layers of nano generator, the described two electrode layers of momentary connection generate moment arteries and veins
Rush electric current；Intermediate energy storage element, for storing the electric energy of the momentary pulse electric current；Target energy-storage travelling wave tube, it is described for storing
The electric energy of intermediate energy storage element output.The setting of the pulse current control switch overcomes the output electric current of friction nanometer power generator small
The shortcomings that, transient pulse high current is exported, instantaneous output power is improved, has the element of induction reactance characteristic as energy by introducing
Amount converts with the intermediary of storing process the high efficiency energy storage for realizing friction nanometer power generator TENG.However what the program provided
Charge density with exchange fan-out capability and be still limited.
Summary of the invention
Swashing with external charge for high charge density can be obtained in atmospheric environment it is an object of that present invention to provide a kind of
The friction generator encouraged.Self continuous supplement of charge is realized by external charge excitation to realize that large charge exports.
Technical scheme is as follows:
A kind of external charge excitation friction generator, including main TENG, it is characterised in that: the generator further includes upper base
Plate, lower substrate, excitation TENG and charge drive system, the upper and lower electrode of the excitation TENG and main TENG is separately mounted to,
On lower substrate, the charge drive system includes voltage doubling rectifing circuit and voltage regulator circuit, the voltage doubling rectifing circuit it is defeated
Voltage is higher than input voltage out, and the input terminal of the voltage doubling rectifing circuit is respectively to the electrode of connection excitation TENG, the multiplication of voltage
The output end of rectification circuit is respectively connected to two electrodes of main TENG.
Preferably, capacitance group can be used as the charge storaging capacitor or voltage multiplying rectifier of main TEGN in voltage doubling rectifing circuit
A charge storage capacitance (Fig. 2) in parallel realizes more stable output between circuit and main TENG.
Working principle of the present invention is as follows: during friction generator contact separation, motivate TENG electrode in piezoelectricity again
The input terminal on road generates an alternating voltage V0, voltage-multiplying circuit output end is made to generate high driving voltage VE, supplied in its output end
The electrode of main TENG has so as to obtain large charge density on main TENG electrode when being lower than critical charge density:Wherein σMIt is the density of surface charge in main TENG, d is the thickness of dielectric film, εrIt is opposite Jie of dielectric film
Electric constant, ε0It is permittivity of vacuum.When main TENG separation, under electrostatic force, the charge in two electrode is to again
Capacitance group (or the capacitor being connected in parallel between voltage doubling rectifing circuit and main TENG) charging in volt circuit, and store a charge in electricity
In appearance group (or described capacitor)；When contact, capacitance group (or described capacitor) again charges to main TENG, and charge comes back to main TENG
Electrode in, to generate one big exchange output, driving load in the loop.
The preferred technical solution of the present invention is as follows:
Preferably, the external charge excitation friction generator further includes voltage regulator circuit, to the voltage multiplying rectifier
Circuit carries out voltage regulator.
Preferably, the voltage regulator circuit include be connected to the voltage doubling rectifing circuit output end and main TENG electrode it
Between zener diode system；Or triode control system.
Preferably, the excitation TENG includes the electrode of metal and one that the friction electric material such as PTFE is posted in a lower surface
A lower electrode.
Preferably, the main TENG includes electrode of metal, lower metal electrode and is covered in wherein one or two electrode
Upper insulative dielectric film.
Preferably, the external charge excitation friction generator further includes composite fluid cushion, the composite fluid cushion
Between substrate and electrode mounted thereto.
Preferably, the sum of leakage current of the voltage doubling rectifing circuit element is less than the average current of excitation TENG.The program
Driving voltage can effectively be generated.
Preferably, the excitation TENG is common contact unpack format, has bipolar electrode or single electrode, single or double insulate
The TENG of electric material.
Preferably, the main TENG is using single dielectric layer model or double dielectric layer models.
Preferably, the voltage doubling rectifing circuit includes multiple voltage multiplying rectifier units.
Preferably, the substrate is hard insulation or the rigid insulation composite material with metallic substrates.
Preferably, the composite fluid cushion is made of liquid cushion, foam and flexible silica gel.
Preferably, the area of the electrode of the excitation TENG and the area ratio of the main TENG electrode are 0.2 or more
(such as 0.5).
The present invention also provides a kind of methods of external charge excitation triboelectricity, comprising: excitation TENG generates alternating current
Voltage doubling rectifing circuit is driven, high direct energizing voltages is generated in voltage doubling rectifing circuit output end and is supplied to main TENG simultaneously
To its electrode charge, a large charge density is generated on the electrode when main two interelectrode capacitance value maximum of TEGN, as main TENG
Electric charge stream is returned in charge storage capacitance when two interelectrode capacitance value minimums.When main TENG capacitance is all between maximum value and minimum value
When phase changes, it will generate a big alternating current in circuit.
The present invention also provides a kind of equipment comprising above-mentioned external charge excitation friction generator, and equipment includes: just
Take formula electronics charging equipment, be placed in collecting mechanical energy in environment energy absorption device (such as: the energy absorption device be sole, road surface,
Tire, mouse or keyboard) or from drive environment monitoring device (such as: the monitoring device be liquid leakage monitoring device
Or structural mutation monitoring device).
The beneficial effects of the present invention are: external charge excitation friction generator of the invention is novel in design rationally, production letter
It is single, low in cost.Voltage-multiplying circuit can generate high driving voltage can also generate big electricity when keeping insulative dielectric film thicker on the electrode
Lotus density can effectively simplify structure as charge storage capacitance using capacitance group in voltage-multiplying circuit and reduce cost.Some
In embodiment, the increase of diode and triode can stablize and control driving voltage and realize the regulation exported to generator, compound
The contact that liquid cushion can be effectively improved between electrode and insulative dielectric film is to increase effective charge density.In atmospheric environment
High output charge density makes it have great potentiality and is driving big electronic equipment, realizes large-sized application and high-power
In terms of self-power supply system.
Detailed description of the invention
Fig. 1 is the schematic diagram of the embodiment of the present invention；
Fig. 2 is the schematic diagram of another embodiment of the present invention；
Fig. 3 A-D is the operation principle schematic diagram of one embodiment of the invention；
Fig. 4 A-J is main TENG and excitation TENG area ratio is 10cm2: 5cm2When output data figure；
Fig. 5 A-C is the chart of the practical application effect of previous embodiment.
Specific embodiment
Below with reference to embodiment and specific embodiment, the present invention is described in further detail.But this should not be understood
For the scope of the above subject matter of the present invention is limited to the following embodiments, all technologies realized based on summary of the invention of the invention are equal
Belong to the scope of the present invention.
Embodiment 1 and its output performance characterization
The embodiment of the present invention 1, using structure shown in Fig. 1: for motivating TEGN, using 50 μm of PTFE film 1, electrode 2
It is respectively aluminium electrode and copper electrode with electrode 3, area is about 5cm2, length and width are respectively 32 and 16mm, rounding radii 5mm.On
Lower substrate 11 is length and width, thick respectively 68mm, 45,4mm acrylic board 11.For main TEGN, electrode 9 and 8 is copper electrode respectively
And aluminium electrode, area are about 10cm2, length and width are all 32mm, the radius chamfer of falling 5mm；It is 9 microns thick poly- between electrode 9 and electrode 8
Acid imide film 10, length and width 40mm.Flexible 13 model ecoflex-10 of silica gel；Liquid cushion uses 1mm thickness business silicon rubber
The bonding encapsulation of offset plate 14 " PEG-200 " 15 is formed, total thickness 3mm, and length and width are identical with acrylic substrate；It, can for better effect
With using the foam 12 of 20Psi polyurethane foam, size is identical with liquid cushion, electrode 3 and flexible silica gel 13 are located at foam
On 12, electrode 9 is located on flexible silica gel 13.For charge drive system, 7 model 1N4007 of rectifier diode, charge storage
6 voltage of capacitor is 6.8Nf, remaining capacitor is 2.2Nf, is the voltage doubling rectifing circuit of standard, and output voltage is the 6 of input voltage
Times.Resistance 17 is in series between voltage doubling rectifing circuit and an electrode of main TENG to use as load.Triode managing and control system 5
The output end of voltage doubling rectifing circuit is connected to between main TENG electrode.A kind of specific embodiment of triode managing and control system 5
5 emitter and collector of triode as shown in figure 1 is connected between two output ends of voltage doubling rectifing circuit, control module connection
Between the emitter and base stage of triode 5.Triode control system is needed to be also possible to those skilled in the art according to different
Other voltage regulator circuits known to member.
Electrode 3 is fixed on foam 12 by golden finger double-sided adhesive, and it is soft that foam by golden finger double-sided adhesive is fixed on liquid
On pad, liquid cushion is fixed on acrylic substrate 11 by golden finger double faced adhesive tape.Flexible silica gel utilizes itself adhesion property
It is adhered on foam, electrode 9 is adhered on flexible silica gel.Polyimides film edge is fixedly attached in aluminium electrode 9, with electrode 9
Center alignment.Electrode 8 is fixed on acrylic substrate 11 by golden finger double faced adhesive tape.
In order to test the output performance of generator, with linear motor under simple harmonic oscillation mode driven generator, use simultaneously
Keithley electrometer (Keithley 6514) and the desk-top multimeter of Keithley seven and half (Keithley DMM7510) measurement power generation
Machine output performance.
As that illustrated in figures 3 a-d, the voltage doubling rectifing circuit in Fig. 1 is 3 voltage multiplying rectifier unit groups to the working principle of the present embodiment
The circuit of conjunction, when input terminal inputs a V0Alternating voltage when, output end will generate 6V0DC output voltage.Fig. 3 A-D
Shown, during contact separation, excitation TENG electrode generates an alternating voltage V in the input terminal of voltage-multiplying circuit0, make multiplication of voltage
Circuit output end generates high driving voltage VE, the electrode 8 and 9 of main TENG is supplied in its output end, so that on main TENG electrode
Large charge density is obtained, is had when being lower than critical charge density:Wherein σMIt is the surface charge in main TENG
Density, d are the thickness of dielectric film 10, εrIt is the relative dielectric constant of dielectric film, ε0It is permittivity of vacuum.When main TENG is separated
When, under electrostatic force, the charge in 8 and 9 charges to capacitance group 16, and stores a charge in capacitance group 16；When contact,
Capacitance group 16 again charges to main TENG, and charge comes back in electrode 8 and 9, so that it is defeated to generate a big exchange in the loop
Out, driving load 17.
In the above scheme: the size of the dielectric insulating film 10 should be greater than the size of electrode 8 and 9, to prevent edge empty
Gas breakdown.Main TENG electrode can more effectively avoid electrode 8 and 9 pair deielectric-coating 10 with rounded corner or using circular electrode
Electrical breakdown.
In the above scheme: the insulative dielectric film 10 can be placed only in one piece of electrode surface and come reduced thickness and production
Technique.In various embodiments, such as in the embodiment of Fig. 2, one piece of insulative dielectric film can also be respectively covered on electrode 8 and 9
19, which carry out guard electrode, prevents electrode to be corroded to adapt to more complicated application environment.
In the above scheme: when capacitance group 16 is as charge storage capacitance in the voltage-multiplying circuit, the capacitor of capacitance group 16
Capacitance selects suitable size when value should be contacted according to main TENG, and generally higher than remaining capacitor is to realize the quick increasing of voltage
Add.
In the above scheme: the dielectric film 10 is thinner, and generator effective charge density is bigger in normal atmospheric environment.
In the above scheme: the substrate 11 can be hard insulation or the rigid insulation with metallic substrates is answered
Condensation material.
In the above scheme: the electrode 2 and 3 can be metal electrode and be also possible to graphite, conducting polymer and conduction
The non-metallic conducting materials such as silica gel.
In the above scheme: the insulative dielectric film 10 can be the higher plastic foil of dielectric strength and thickness is suitably brilliant
The dielectric materials such as body film block.
As shown in Fig. 4 A-J: the determining charge density that excitation TEGN is shown in Fig. 4 A is 0.12mC m-2；Pass through charge drive
Main TENG effective charge density has reached 0.81mC m under non-pressure stabilizing and 1Hz driving frequency-2(Fig. 4 B), main TEGN in Fig. 4 C-D
Effective charge density has reached 0.72mC m-2Under 4Hz driving frequency and pressure stabilizing, Fig. 4 F and Fig. 4 G, which are illustrated, drives frequency in 4Hz
The short circuit current and voltage of main TEGN when rate and pressure stabilizing, electric current and voltage all maintain a stable output, respectively reach
200mAm-2And 817V.When Fig. 4 H shows non-pressure stabilizing, as the increase electric current and voltage of driving frequency are consequently increased, in 6Hz
252mA m is respectively reached-2And 817V.The surface Fig. 4 J generator when load is 4M Ω has peak power output 38.2Wm-2。
Fig. 4 A-J is main TENG and excitation TENG area ratio is 10cm2: 5cm2When output data figure.Including motivating TENG
Charge density figure (Fig. 4 A)；Main TEGN charge density figure (Fig. 4 B) when non-pressure stabilizing, wherein the illustration at top is effective charge density
Curve, bottom are waveform enlarged drawings；Main TENG charge density curve graph (Fig. 4 C) when pressure stabilizing, (Fig. 4 D) and (Fig. 4 E) is steady respectively
Effective charge density figure and waveform enlarged drawing when pressure；Current density plot figure (Fig. 4 F), wherein yellow background is waveform enlarged drawing；
Voltage curve (Fig. 4 G), wherein yellow curve is waveform enlarged drawing；Current density figure (Fig. 4 H) and voltage pattern under different frequency
(Fig. 4 I)；Current density and power density diagram (Fig. 4 J) under different loads.The implementation is demonstrated in the chart of Fig. 4 A-J
Scheme can produce large charge density.
It is another embodiment of the present invention shown in Fig. 2, it is similar to Example 1, the difference is that, by triode pipe therein
Control system replacement is zener diode system, is connected later pressure stabilizing with the rectifying tube 4 of two model HER104 300V, electricity
Road connection is as shown in Figure 2.
20 concatenated 10mm have been directly driven in black and white environment respectively with generator obtained in embodiment 1
Diameter LED light has issued macroscopic white light.340 concatenated 5mm diameter LED light can also be driven simultaneously, and are had issued
More bright lamplight.
It is charged after rectification circuit in Fig. 5 A to capacitor with generator obtained in embodiment 1, in 4Hz driving frequency
Under, Fig. 5 B shows that 1 μ F capacitor directly can be charged to 200V by generator in 80 seconds, and Fig. 5 C shows that generator can be 90
By 22 μ F capacitor chargings to 20V in second.
The present invention is not limited to above-mentioned specific embodiment, it should be understood that those skilled in the art are without creativeness
Labour, which according to the present invention can conceive, makes many modifications and variations.In short, all technician in the art are according to this
The design of invention passes through the available technical side of logical analysis, reasoning, or a limited experiment on the basis of existing technology
Case, all should be within the scope of protection determined by the claims.
Claims (15)
1. a kind of external charge motivates friction generator, including main TENG, it is characterised in that: the generator further includes upper base
Plate, lower substrate, excitation TENG and charge drive system, the upper and lower electrode of the excitation TENG and main TENG is separately mounted to,
On lower substrate, the charge drive system includes voltage doubling rectifing circuit and voltage regulator circuit, the output electricity of the voltage doubling rectifing circuit
Pressure is higher than input voltage, and the input terminal of the voltage doubling rectifing circuit is respectively connected to the electrode of excitation TENG, the voltage multiplying rectifier
The output end of circuit is respectively connected to two electrodes of main TENG, the voltage regulator circuit be connected between voltage-multiplying circuit output end with
Stablize and regulate and control driving voltage.
2. external charge according to claim 1 motivates friction generator, it is characterised in that: in voltage doubling rectifing circuit and master
A charge storage capacitance in parallel between TENG.
3. external charge according to claim 1 motivates friction generator, it is characterised in that: the voltage regulator circuit packet
Include the zener diode system being connected in parallel between the voltage doubling rectifing circuit output end and main TENG electrode；Or triode control
System processed.
4. external charge according to claim 1 motivates friction generator, it is characterised in that: the voltage doubling rectifing circuit packet
Include multiple voltage multiplying rectifier units.
5. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the excitation
TENG includes the electrode of metal and a lower electrode that PTFE friction electric material is posted in a lower surface.
6. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the main TENG
Upper and lower electrode include electrode of metal, lower metal electrode, the main TENG is also covered on wherein one or two electrode absolutely
Edge dielectric film.
7. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the external electrical
It further includes composite fluid cushion that lotus, which motivates friction generator, and the composite fluid cushion is located at substrate and electrode mounted thereto
Between.
8. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: described times of repoussage
The sum of leakage current of galvanic electricity circuit component is less than the average current of excitation TENG.
9. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the excitation
TENG is common contact unpack format, the TENG with bipolar electrode or single electrode, the single or double electric material that insulated.
10. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the main TENG
Using single dielectric layer model or double dielectric layer models.
11. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the substrate is
Hard insulation or rigid insulation composite material with metallic substrates.
12. external charge according to claim 7 motivates friction generator, it is characterised in that: the composite fluid cushion
It is made of liquid cushion, foam and flexible silica gel.
13. motivating friction generator to external charge described in one of 4 according to claim 1, it is characterised in that: the excitation
The area ratio of the area of the electrode of TENG and the main TENG electrode is 0.2 or greater than 0.2.
14. a kind of method of external charge excitation triboelectricity, comprising: excitation TENG generates alternating current to drive voltage multiplying rectifier electric
Road generates a high direct energizing voltages in voltage doubling rectifing circuit output end and is supplied to main TENG and to its electrode charge, when
Generate a large charge density on the electrode when main two interelectrode capacitance value maximum of TEGN, when main two interelectrode capacitance value of TENG most
Hour electric charge stream is returned in charge storage capacitance.
15. a kind of equipment of the external charge excitation friction generator comprising one of claim 1 to 13, equipment includes: portable
Formula electronics charging equipment is placed in environment the energy absorption device of collecting mechanical energy or from drive environment monitoring device.
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| CN110317710A (en) * | 2019-06-14 | 2019-10-11 | 清华大学 | A kind of micro-capsule manufacturing system generating high pressure based on Mechanical Driven |
| CN110376184A (en) * | 2019-06-14 | 2019-10-25 | 清华大学 | Micro-plasma generator and self energizing gas sensor based on friction electricity |
| CN110847549A (en) * | 2019-11-27 | 2020-02-28 | 重庆大学 | Self-driven air negative ion generation floor |
| CN111446882A (en) * | 2020-03-07 | 2020-07-24 | 重庆大学 | Composite flexible carbon gel electrode for friction generator and preparation method thereof |
| CN111585174A (en) * | 2020-06-08 | 2020-08-25 | 重庆大学 | Zero-power consumption ion generator |
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| CN113315407A (en) * | 2021-05-13 | 2021-08-27 | 清华大学 | Electric energy receiving and transmitting system based on friction nanometer generator |
| CN113541524A (en) * | 2021-08-02 | 2021-10-22 | 重庆大学 | Friction nanometer generator based on suspension sliding type charge self-excitation |
| CN113595433A (en) * | 2021-07-08 | 2021-11-02 | 浙江师范大学 | Dielectric elastomer energy collection system and method |
| CN113738196A (en) * | 2021-08-27 | 2021-12-03 | 科思技术(温州)研究院 | Coded lock and control method thereof |
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| CN110317710A (en) * | 2019-06-14 | 2019-10-11 | 清华大学 | A kind of micro-capsule manufacturing system generating high pressure based on Mechanical Driven |
| CN110376184A (en) * | 2019-06-14 | 2019-10-25 | 清华大学 | Micro-plasma generator and self energizing gas sensor based on friction electricity |
| CN110847549A (en) * | 2019-11-27 | 2020-02-28 | 重庆大学 | Self-driven air negative ion generation floor |
| CN110847549B (en) * | 2019-11-27 | 2020-11-06 | 重庆大学 | Self-driven air negative ion generation floor |
| CN111446882A (en) * | 2020-03-07 | 2020-07-24 | 重庆大学 | Composite flexible carbon gel electrode for friction generator and preparation method thereof |
| CN111446882B (en) * | 2020-03-07 | 2021-06-25 | 重庆大学 | Composite flexible carbon gel electrode for friction generator and preparation method thereof |
| CN111585174A (en) * | 2020-06-08 | 2020-08-25 | 重庆大学 | Zero-power consumption ion generator |
| CN111585174B (en) * | 2020-06-08 | 2022-06-17 | 重庆大学 | Zero-power consumption ion generator |
| CN114079402A (en) * | 2020-08-11 | 2022-02-22 | 嘉兴珏创科技有限公司 | Special power generation device |
| CN112583297B (en) * | 2020-11-25 | 2022-03-08 | 江苏科技大学 | Friction nanometer generator based on fiber sliding and preparation method thereof |
| CN112583297A (en) * | 2020-11-25 | 2021-03-30 | 江苏科技大学 | Friction nanometer generator based on fiber sliding and preparation method thereof |
| CN113315407A (en) * | 2021-05-13 | 2021-08-27 | 清华大学 | Electric energy receiving and transmitting system based on friction nanometer generator |
| CN113595433A (en) * | 2021-07-08 | 2021-11-02 | 浙江师范大学 | Dielectric elastomer energy collection system and method |
| CN113541524A (en) * | 2021-08-02 | 2021-10-22 | 重庆大学 | Friction nanometer generator based on suspension sliding type charge self-excitation |
| CN113541524B (en) * | 2021-08-02 | 2022-11-22 | 重庆大学 | Friction nanometer generator based on suspension sliding type charge self-excitation |
| CN113738196A (en) * | 2021-08-27 | 2021-12-03 | 科思技术(温州)研究院 | Coded lock and control method thereof |
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