CN104767266A - Power generation backpack based on piezoelectric effect - Google Patents
Power generation backpack based on piezoelectric effect Download PDFInfo
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- CN104767266A CN104767266A CN201510104927.4A CN201510104927A CN104767266A CN 104767266 A CN104767266 A CN 104767266A CN 201510104927 A CN201510104927 A CN 201510104927A CN 104767266 A CN104767266 A CN 104767266A
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- 230000000694 effects Effects 0.000 title claims abstract description 23
- 238000010248 power generation Methods 0.000 title abstract description 7
- 238000004146 energy storage Methods 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 230000033001 locomotion Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005669 field effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000005204 segregation Methods 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000013536 elastomeric material Substances 0.000 claims description 3
- 239000002305 electric material Substances 0.000 claims description 3
- 235000014443 Pyrus communis Nutrition 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims description 2
- 239000013078 crystal Substances 0.000 description 9
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 210000000689 upper leg Anatomy 0.000 description 2
- 210000003423 ankle Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000002683 foot Anatomy 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 210000000629 knee joint Anatomy 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
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- Engineering & Computer Science (AREA)
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention relates to a power generation backpack, in particular to a power generation backpack based on the piezoelectric effect. The power generation backpack based on the piezoelectric effect comprises an energy conversion module installed in the backpack, a power conversion module connected with the energy conversion module and an energy storage module connected with the output end of the power conversion module; the energy conversion module is used for converting mechanical energy generated in the human motion process into vibration energy of weights in the backpack and then converting the vibration energy of the weights into power energy, the power conversion module is used for converting and regulating the power energy collected by the energy conversion module, and the energy storage module is used for storing the converted and regulated power energy; the output end of the power conversion module is also connected with electric equipment which is connected with the energy storage module in parallel. According to the power generation backpack based on the piezoelectric effect, the mechanical energy generated in the human motion process can be converted into the power energy, and the power supply problem when an electric network is far away outdoors is solved, so that people can do outdoor sports more conveniently; meanwhile, the walking step number of people in the outdoor sports can be also calculated, and the sport interestingness can be increased.
Description
Technical field
The present invention relates to a kind of generating knapsack, particularly relate to a kind of generating knapsack based on piezoelectric effect.
Background technology
Along with the development in epoch, the living standard of people has had significant raising, and amusement and recreation mode also becomes varied gradually.Go on a hike in field, the outdoor activities such as field mountain-climbing have become the pith that people live vacation.But people can not charge for the entrained power consumption equipment such as electronic product, emergency light more very easily out of doors.This has become a major issue of restriction people outdoor activities.Therefore our exigence seeks one generation mode eaily.
Human body contains the not yet exploitation huge energy ignored by the mankind.It contains chemical energy, electrostatic energy, heat energy and mechanical energy.The mechanical energy that Human To Human's body motions such as Niu produce is studied, research shows: the energy that can be produced different size by each position of movement human, such as: ankle motion produces 69.8W energy, motion of knee joint produces 49.5W energy, ancon motion produces 2.1W energy, shoulder movements produces 2.2W energy.But these energy often be have ignored by people, such as in the various outdoor exercises of people, the strenuous exercise of (as: field hiking, field mountaineering) carry-on human body produces a large amount of mechanical energy.
Of a great variety for the device collecting vibrational energy at present, there are electromagnetic type gathering-device, electrostatic gathering-device, piezoelectric type gathering-device etc.Wherein because piezoelectric type gathering-device structure simply, is not generated heat, without electromagnetic interference, clean environment firendly, is easy to microminiaturized advantage, piezoelectric type gathering-device most study, most widely used general.Along with the extensive research to the energy gathering apparatus based on piezoelectric, there is various piezoelectric generating device, as cantilever beam monocrystalline, twin crystal structure, Cymbal structure, stack type structure etc.
1880, French physician P. Curie and J. Curie brother found weight to be placed on quartz crystal, and some surface of crystal can produce electric charge, the quantity of electric charge and proportional pressure.This phenomenon is called as piezoelectric effect.The mechanism of piezoelectric effect is: the crystal symmetry with piezoelectricity is lower, when being subject to External Force Acting generation deformation, in structure cell, the relative displacement of negative ions makes positive and negative charge center no longer overlap, cause crystal generation macroscopic polarization, and plane of crystal surface density of charge equals the projection of polarization intensity on surface normal, so piezoelectric is stressed, during effect deformation, both ends of the surface there will be heterocharge.
The crystalline material of voltage can be there is in piezoelectric between both ends of the surface when referring to and be under pressure effect.Piezoelectric can be divided three classes: the first kind is inorganic piezoelectric material, and be divided into piezoelectric crystal and piezoelectric ceramic, piezoelectric crystal generally refers to piezoelectric single crystal; Piezoelectricity polycrystal then made a general reference by piezoelectric ceramic.Piezoelectric ceramic piezoelectricity is strong, dielectric constant is high, can be processed into arbitrary shape, but mechanical quality factor is lower, electrical loss is comparatively large, poor stability.Quartz waits piezoelectricity monocrystalline piezoelectric weak, and dielectric constant is very low, and there is size limitations by cut type restriction, but stability is very high, mechanical quality factor is high.Equations of The Second Kind is organic piezoelectric materials, also known as piezopolymer, as segregation PVF (PVDF) (film) and other be other organic piezoelectricity (film) materials of representative.This kind of material and material pliable and tough, low-density, the advantage such as Low ESR and high-tension electricity voltage constant (g).3rd class is composite piezoelectric material, and this kind of material embeds sheet in organic polymer base material, bar-shaped, shaft-like or Powdered piezoelectric is formed.So far be widely used in fields such as the underwater sound, electroacoustic, ultrasonic, medical science.If it makes underwater acoustic transducer, not only there is the high hydrostatic pressing speed of response, and shock-resistant, easily damaged and available from the not different degree of depth.
The device utilizing human motion to generate electricity is there is in prior art.Such as, application number is that " 200720083461.5 " name is called that the Chinese utility model patent of " holding power generation fitness electric torch " discloses a kind of holding power generation device, and it comprises spring-grip, crankshaft-link rod, drive, speed changer and microgenerator.This patent is by the grip of hand to power flashlights, and what shortcoming was to continue charges to flashlight.
Such as: application number is that " 200620033837.7 " name is called that the Chinese utility patent new patent of " piezoelectric charging footwear " discloses a kind of piezoelectric generating device, and it comprises piezoelectric element, rectification circuit and energy storage capacitor.In this patent utilization walking process, the pressure of foot carrys out harvest energy, and then is converted into electric energy, and shortcoming is that the electric energy utilizing this device to send is little.
Again such as, application number is called that for " 201410359309.X " name the Chinese utility model patent of " portable walking Blast Furnace Top Gas Recovery Turbine Unit (TRT) " discloses a kind of walking Blast Furnace Top Gas Recovery Turbine Unit (TRT), and it comprises upper and lower magic tape, front and back polymethyl methacrylate, bridge rectifier voltage stabilizing circuit plate, storage battery, generator, stay cord, wire winding ring, main shaft, scroll spring and wire.Range difference in this patent utilization human walking procedure between thigh and shank, drive electrical generators work, thus the object reaching generating.But this device needs to be bundled on thigh and shank, people can be allowed to have sense of discomfort when moving.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of generating knapsack based on piezoelectric effect, this generating knapsack is changes mechanical energy human motion produced by piezoelectric is electric energy, generates electricity.
For solving the problem, the technical scheme that the present invention takes is: the energy conversion module being arranged on inside backpacks, for the mechanical energy produced in human motion process being converted to the vibrational energy of inside backpacks weight, then the vibrational energy of weight is converted to electric energy;
Power converter module, is connected with described energy conversion module, and the electric energy for energy conversion module being collected carries out converting and adjusting;
Energy-storage module, is connected with described power converter module output, for storing the electric energy through conversion and adjustment;
The output of described power converter module is also connected with power consumption equipment, and this power consumption equipment is in parallel with energy-storage module.
Described energy conversion module comprises the backpack support being arranged on inside backpacks, is arranged on the flexible member of the vibrational energy for the mechanical energy of human motion being converted to inside backpacks weight at backpack support top and is placed in the piezoelectric patches that the vibrational energy of inside backpacks weight is converted to electric energy by being used for bottom knapsack.
Described flexible member is spring, and one end of this flexible member is fixed on backpack support, and the other end is for hanging inside backpacks weight.
Described piezoelectric patches adopts the some layer of piezo-electric material in cantilever beam structure to stack and forms, and be all provided with elastomeric material between every layer, the circuit in parallel of piezoelectric, described piezoelectric patches resembles a pear in shape.
Described piezoelectric adopts segregation fluoride material.
Described power converter module comprises power model and control module;
Described power model comprises rectifying device, stable-pressure device and DC-DC converting means;
Described control module comprises voltage detecting circuit, battery power detection circuit and single-chip microcomputer;
Described rectifying device is connected with energy conversion module, and the alternating current that energy conversion module exports is converted to direct current; DC-DC converting means is connected with rectifying device, the voltage and current exported for regulating rectifying device; Stable-pressure device is provided with between rectifying device and DC-DC converting means;
The output of described stable-pressure device is also connected with voltage detecting circuit, and the output of voltage detecting circuit is connected with the single-chip microcomputer for receiver voltage testing circuit signal, and single-chip microcomputer is according to the output voltage of the signal adjustment DC-DC converting means of voltage detecting circuit;
The output of single-chip microcomputer is also connected with power consumption equipment and energy storage device;
The input of single-chip microcomputer is also connected to liquid crystal display and keyboard, and this liquid crystal display is used for showing the electricity of energy-storage module, and described keyboard is used for providing the status signal controlling power consumption equipment and energy-storage module to single-chip microcomputer.Described rectifying device adopts full bridge rectifier, and this full bridge rectifier comprises diode VD1, diode VD2, diode VD3, diode VD4;
Wherein, described diode VD1 connects with diode VD4 and forms branch road one, and described diode VD3 connects with diode VD2 and forms branch road two, and branch road one and branch road two act on two kinds of situations in alternating current one-period respectively;
Described stable-pressure device is made up of bulky capacitor C1;
Described DC-DC converting means comprises field effect transistor MOSFET1, inductance L, diode VD5 and electric capacity C2;
Described voltage detecting circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier;
Wherein, the normal phase input end of the first operational amplifier connects bus, the output of the first operational amplifier is connected with the normal phase input end of the second operational amplifier by resistance R2, the output of the second operational amplifier is connected with the normal phase input end of the 3rd operational amplifier by diode VD7 and resistance R5, the output of the 3rd amplifier is connected with the inverting input of four-operational amplifier with resistance R8 by resistance R7, and the output of four-operational amplifier is connected with single-chip microcomputer;
The normal phase input end of the first operational amplifier and output series resistor R1; The output of the first operational amplifier and the normal phase input end serial connection R4 of the 3rd operational amplifier, the normal phase input end of the second operational amplifier and output reversal connection diode VD6, the normal phase input end of the second operational amplifier and diode VD7 positive pole serial connection R3; The normal phase input end of the 3rd operational amplifier and output series resistor R6; The normal phase input end of four-operational amplifier and output short circuit, inverting input is by electric capacity C3 ground connection, and output is connected by electric capacity C4 with R8 front end;
The power end of the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier all selects the equal ground connection of VCC5, common port, and the equal ground connection of inverting input of the first operational amplifier, the second operational amplifier and the 3rd operational amplifier.
Described battery power detection circuit comprises the battery capacity detector BQ27532-Gl being connected on energy-storage module two ends, the positive pole of the BAT termination energy-storage module of described battery capacity detector BQ27532-Gl, the negative pole of the SRP termination energy-storage module of battery capacity detector BQ27532-Gl, the BI/TOUT end of battery capacity detector BQ27532-Gl connects the negative pole of energy-storage module by resistance R11 and resistance R12, the TS end of battery capacity detector BQ27532-Gl is connected between resistance R11 and resistance R12, the BI/TOUT end of battery capacity detector BQ27532-Gl is also held with the VCC of battery capacity detector BQ27532-Gl by resistance R10 and is connected, the SRP end of battery capacity detector BQ27532-Gl is by resistance R13 ground connection, the SRN of battery capacity detector BQ27532-Gl holds ground connection, the REGIN end of battery capacity detector BQ27532-Gl and CE termination power consumption equipment, the VSS of battery capacity detector BQ27532-Gl holds ground connection, the SOCINT termination single-chip microcomputer of battery capacity detector BQ27532-Gl.
Described energy-storage module is lead acid accumulator.
Described power consumption equipment is pedometer.
Compared with prior art, the present invention has following beneficial effect: the mechanical energy produced during human motion is converted to the vibrational energy of inside backpacks weight by the present invention by spring in inside backpacks installation energy conversion module, the vibrational energy of inside backpacks weight is converted to electric energy, then the electric energy obtained in energy conversion module is delivered in power converter module, the electric energy obtained through power converter module is delivered in energy-storage module, by power storage or directly supply power consumption equipment, the mechanical energy produced in human motion process is converted into electric energy by the present invention, solve out of doors away from the problem of supply of electric power when power utilization network, people are made to carry out outdoor exercises more easily.
Further, power consumption equipment is the step number that pedometer also can calculate people's walking in outdoor exercises simultaneously, increases the interest of motion.
Accompanying drawing explanation
Fig. 1 is Knapsack structure schematic diagram of the present invention;
Fig. 2 is the piezoelectric plate structure figure of cantilever beam structure of the present invention;
Fig. 3 is the piezoelectric patches vertical view of cantilever beam structure of the present invention;
Fig. 4 is theory diagram of the present invention;
Fig. 5 is the basic circuit diagram of invention;
Fig. 6 is voltage detecting circuit figure of the present invention;
Fig. 7 is battery power detection circuit figure of the present invention;
Wherein, 1, backpack support; 2, spring; 3, piezoelectric patches; 4, PVDF material; 5, elastomeric material.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details:
See Fig. 1-Fig. 7, the present invention includes the energy conversion module being arranged on inside backpacks, for the mechanical energy produced in human motion process being converted to the vibrational energy of inside backpacks weight, then the vibrational energy of weight being converted to electric energy; Power converter module, is connected with energy conversion module, and the electric energy for energy conversion module being collected carries out converting and adjusting; Energy-storage module, is connected with power converter module output, for the power storage by passing through conversion and adjustment; The output of power converter module is also connected with power consumption equipment, and this power consumption equipment is in parallel with energy-storage module.
Energy conversion module comprises the backpack support 1 being arranged on inside backpacks, be arranged on the flexible member 2 of the vibrational energy for the mechanical energy of human motion being converted to inside backpacks weight at backpack support 1 top and be placed in the piezoelectric patches 3 that the vibrational energy of inside backpacks weight is converted to electric energy by being used for bottom knapsack, piezoelectric patches 3 selects the multi-layer piezoelectric material of cantilever beam structure to be formed in parallel, the shape of piezoelectric patches is pyriform, piezoelectric selects material pliable and tough, low-density, the segregation fluoride material of Low ESR and high-tension electricity voltage constant, piezoelectric patches is stacked by piezoelectric, every layer of all flexible material, voltage on piezoelectric patches 3 exports employing and is connected in parallel.
Flexible member 2 of the present invention is spring, and one end of this flexible member 2 is fixed on backpack support 1, and the other end is for hanging inside backpacks weight.
Power converter module of the present invention comprises power model and control module, and wherein power model comprises rectifying device, stable-pressure device and DC-DC converting means, and control module comprises voltage detecting circuit, battery power detection circuit and single-chip microcomputer;
Rectifying device is connected with energy conversion module, applies full bridge rectifier, and object is that the alternating current in order to energy conversion module be exported is converted to direct current;
DC-DC converting means applies stepping-up/stepping-down chopper circuit, and object is the voltage and current exported for adjusting rectifying device.
Stable-pressure device is provided with between rectifying device and DC-DC converting means; Stable-pressure device is bulky capacitor, object be for stable full bridge rectifier after voltage.
The output of stable-pressure device is also connected with voltage detecting circuit, and voltage detecting circuit is used to detect the voltage after full bridge rectifier, and this value is fed back to single-chip microcomputer; Battery power detection circuit is used to the electricity stored in detection energy-storage module; Single-chip microcomputer is used to receive the signal from voltage detecting circuit, and judge according to this signal the on off state exporting stepping-up/stepping-down chopper circuit MOSFET1, thus output voltage is remained unchanged, single-chip microcomputer is also connected with liquid crystal display and keyboard, and liquid crystal display is used for showing the charge value of energy storage device of battery power detection circuit feedback; Keyboard is used to the signal of single-chip microcomputer about the on off state of MOSFET2 and MOSFET3 in control circuit, thus controls the purposes of the electric energy sent.
Rectifying device of the present invention adopts full bridge rectifier, and this full bridge rectifier comprises diode VD1, diode VD2, diode VD3, diode VD4; Stable-pressure device of the present invention is made up of bulky capacitor C1.
DC-DC converting means comprises metal oxide semiconductor field effect tube MOSFET1, inductance L, diode VD5 and electric capacity C2;
Wherein, field effect transistor MOSFET1 collector electrode connects one end of electric capacity C1, the emitter of field effect transistor MOSFET1 is connected with the positive pole of diode VD5, the negative pole of diode VD5 connects the collector electrode of one end of electric capacity C2, the collector electrode of field effect transistor MOSFET2 and field effect transistor MOSFET3 successively, and the emitter of field effect transistor MOSFET2 is connected with the positive pole of energy-storage module;
One end of inductance L is connected between the emitter of field effect transistor MOSFET1 and the positive pole of diode VD5, and the negative pole of the other end of inductance L, the other end of electric capacity C2, energy-storage module is all connected with the emitter of field effect transistor MOSFET3 by power consumption equipment;
Voltage detecting circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier;
Wherein, the normal phase input end of the first operational amplifier connects bus, the output of the first operational amplifier is connected with the normal phase input end of the second operational amplifier by resistance R2, the output of the second operational amplifier is connected with the normal phase input end of the 3rd operational amplifier by diode VD7 and resistance R5, the output of the 3rd amplifier is connected with the inverting input of four-operational amplifier with resistance R8 by resistance R7, and the output of four-operational amplifier is connected with single-chip microcomputer;
The normal phase input end of the first operational amplifier and output series resistor R1; The output of the first operational amplifier and the normal phase input end serial connection R4 of the 3rd operational amplifier, the normal phase input end of the second operational amplifier and output reversal connection diode VD6, the normal phase input end of the second operational amplifier and diode VD7 positive pole serial connection R3; The normal phase input end of the 3rd operational amplifier and output series resistor R6; The normal phase input end of four-operational amplifier and output short circuit, inverting input is by electric capacity C3 ground connection, and output is connected by electric capacity C4 with R8 front end.
The power end of the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier all selects the equal ground connection of VCC5, common port, and the equal ground connection of inverting input of the first operational amplifier, the second operational amplifier and the 3rd operational amplifier.
Battery power detection circuit is provided with between single-chip microcomputer and energy-storage module, described battery power detection circuit comprises the battery capacity detector BQ27532-Gl being connected on energy-storage module two ends, the positive pole of the BAT termination energy-storage module of described battery capacity detector BQ27532-Gl, the negative pole of the SRP termination energy-storage module of battery capacity detector BQ27532-Gl, the BI/TOUT end of battery capacity detector BQ27532-Gl connects the negative pole of energy-storage module by resistance R11 and resistance R12, the TS end of battery capacity detector BQ27532-Gl is connected between resistance R11 and resistance R12, the BI/TOUT end of battery capacity detector BQ27532-Gl is also held with the VCC of battery capacity detector BQ27532-Gl by resistance R10 and is connected, the SRP end of battery capacity detector BQ27532-Gl is by resistance R13 ground connection, the SRN of battery capacity detector BQ27532-Gl holds ground connection, the REGIN end of battery capacity detector BQ27532-Gl and CE termination power consumption equipment, the VSS of battery capacity detector BQ27532-Gl holds ground connection, the SOCINT termination single-chip microcomputer of battery capacity detector BQ27532-Gl.
Energy-storage module of the present invention is lead acid accumulator, for storing the electric energy obtained.
Power consumption equipment of the present invention is pedometer.
The equivalent electric circuit of piezoelectric of the present invention is formed in parallel by current source Ip and Cp.
Knapsack of the present invention is used for moving at human body, especially during outdoor exercises, the mechanical energy produced during human motion is converted to the vibrational energy of inside backpacks weight by the energy conversion module being arranged on inside backpacks by spring, by piezoelectric patches, the vibrational energy of inside backpacks weight is converted to electric energy.Then the electric energy obtained in energy conversion module is delivered in power converter module.Power converter module comprises power model and control module.Wherein power model comprises bridge rectifier device, stable-pressure device and DC-DC converting means.Control module comprises voltage detecting circuit, battery power detection circuit and single-chip microcomputer.Then deliver in energy-storage module by the electric energy obtained through power converter module, by power storage or directly supply power consumption equipment, this power consumption equipment refers in particular to pedometer herein.
Energy conversion module operation principle of the present invention: human body motion process in due to dipping and heaving gravitional force change, be inconjunction with weight gravitional force change (rippling) that inside backpacks be suspended on by spring, form vibrational energy (being namely the vibrational energy that mechanical energy is converted to inside backpacks weight) herein, due to the piezoelectric be positioned at bottom knapsack can be oppressed in weight rippling process, according to the self-characteristic of piezoelectric, the electric energy vibrational energy of weight (be namely be converted to electric energy) can be produced herein.
The mechanical energy produced in human motion process is converted into electric energy by the present invention, solves out of doors away from the problem of supply of electric power when power utilization network, makes people carry out outdoor exercises more easily; Also can calculate the step number of people's walking in outdoor exercises simultaneously, increase the interest of motion.
Claims (10)
1. the generating knapsack based on piezoelectric effect, it is characterized in that: the energy conversion module being arranged on inside backpacks, for the mechanical energy produced in human motion process being converted to the vibrational energy of inside backpacks weight, then the vibrational energy of weight is converted to electric energy;
Power converter module, is connected with described energy conversion module, and the electric energy for energy conversion module being collected carries out converting and adjusting;
Energy-storage module, is connected with described power converter module output, for storing the electric energy through conversion and adjustment;
The output of described power converter module is also connected with power consumption equipment, and this power consumption equipment is in parallel with energy-storage module.
2. a kind of generating knapsack based on piezoelectric effect according to claim 1, it is characterized in that: described energy conversion module comprises the backpack support (1) being arranged on inside backpacks, the flexible member (2) being arranged on the vibrational energy for the mechanical energy of human motion being converted to inside backpacks weight at backpack support (1) top and the piezoelectric patches (3) for the vibrational energy of inside backpacks weight being converted to electric energy be placed in bottom knapsack.
3. a kind of generating knapsack based on piezoelectric effect according to claim 2, it is characterized in that: described flexible member (2) is spring, one end of this flexible member (2) is fixed on backpack support (1), and the other end is for hanging inside backpacks weight.
4. a kind of generating knapsack based on piezoelectric effect according to claim 2, it is characterized in that: described piezoelectric patches (3) adopts the some layer of piezo-electric material in cantilever beam structure to stack and forms, all elastomeric material is provided with, the circuit in parallel that piezoelectric is formed between every layer of piezo-electric material;
Described piezoelectric patches (3) resembles a pear in shape.
5. a kind of generating knapsack based on piezoelectric effect according to claim 4, is characterized in that: described piezoelectric adopts segregation fluoride material.
6. a kind of generating knapsack based on piezoelectric effect according to claim 1, is characterized in that: described power converter module comprises power model and control module;
Described power model comprises rectifying device, stable-pressure device and DC-DC converting means;
Described control module comprises voltage detecting circuit, battery power detection circuit and single-chip microcomputer;
Described rectifying device is connected with energy conversion module, and the alternating current that energy conversion module exports is converted to direct current; DC-DC converting means is connected with rectifying device, the voltage and current exported for regulating rectifying device; Stable-pressure device is provided with between rectifying device and DC-DC converting means;
The output of described stable-pressure device is also connected with voltage detecting circuit, and the output of voltage detecting circuit is connected with the single-chip microcomputer for receiver voltage testing circuit signal, and single-chip microcomputer is according to the output voltage of the signal adjustment DC-DC converting means of voltage detecting circuit;
The output of single-chip microcomputer is also connected with power consumption equipment and energy storage device;
The input of single-chip microcomputer is also connected to liquid crystal display and keyboard, and this liquid crystal display is used for showing the electricity of energy-storage module, and described keyboard is used for providing the status signal controlling power consumption equipment and energy-storage module to single-chip microcomputer.
7. a kind of generating knapsack based on piezoelectric effect according to claim 6, is characterized in that: described rectifying device adopts full bridge rectifier, and this full bridge rectifier comprises diode VD1, diode VD2, diode VD3, diode VD4;
Wherein, described diode VD1 connects with diode VD4 and forms branch road one, and described diode VD3 connects with diode VD2 and forms branch road two;
Described stable-pressure device is made up of bulky capacitor C1;
Described DC-DC converting means comprises field effect transistor MOSFET1, inductance L, diode VD5 and electric capacity C2;
Described voltage detecting circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier;
Wherein, the normal phase input end of the first operational amplifier connects bus, the output of the first operational amplifier is connected with the normal phase input end of the second operational amplifier by resistance R2, the output of the second operational amplifier is connected with the normal phase input end of the 3rd operational amplifier by diode VD7 and resistance R5, the output of the 3rd amplifier is connected with the inverting input of four-operational amplifier with resistance R8 by resistance R7, and the output of four-operational amplifier is connected with single-chip microcomputer;
The normal phase input end of the first operational amplifier and output series resistor R1; The output of the first operational amplifier and the normal phase input end serial connection R4 of the 3rd operational amplifier, the normal phase input end of the second operational amplifier and output reversal connection diode VD6, the normal phase input end of the second operational amplifier and diode VD7 positive pole serial connection R3; The normal phase input end of the 3rd operational amplifier and output series resistor R6; The normal phase input end of four-operational amplifier and output short circuit, inverting input is by electric capacity C3 ground connection, and output is connected by electric capacity C4 with R8 front end;
The power end of the first operational amplifier, the second operational amplifier, the 3rd operational amplifier and four-operational amplifier all selects the equal ground connection of VCC5, common port, and the equal ground connection of inverting input of the first operational amplifier, the second operational amplifier and the 3rd operational amplifier.
8. a kind of generating knapsack based on piezoelectric effect according to claim 6, it is characterized in that: described battery power detection circuit comprises the battery capacity detector BQ27532-Gl being connected on energy-storage module two ends, the positive pole of the BAT termination energy-storage module of described battery capacity detector BQ27532-Gl, the negative pole of the SRP termination energy-storage module of battery capacity detector BQ27532-Gl, the BI/TOUT end of battery capacity detector BQ27532-Gl connects the negative pole of energy-storage module by resistance R11 and resistance R12, the TS end of battery capacity detector BQ27532-Gl is connected between resistance R11 and resistance R12, the BI/TOUT end of battery capacity detector BQ27532-Gl is also held with the VCC of battery capacity detector BQ27532-Gl by resistance R10 and is connected, the SRP end of battery capacity detector BQ27532-Gl is by resistance R13 ground connection, the SRN of battery capacity detector BQ27532-Gl holds ground connection, the REGIN end of battery capacity detector BQ27532-Gl and CE termination power consumption equipment, the VSS of battery capacity detector BQ27532-Gl holds ground connection, the SOCINT termination single-chip microcomputer of battery capacity detector BQ27532-Gl.
9. a kind of generating knapsack based on piezoelectric effect according to claim 1, is characterized in that: described energy-storage module is lead acid accumulator.
10. a kind of generating knapsack based on piezoelectric effect according to claim 1, is characterized in that: described power consumption equipment is pedometer.
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