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35 results about "Electromagnetic energy harvester" patented technology
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Micro electromagnetic energy harvester and a preparation method
InactiveCN101515746ASmall sizeReduce spacingPermanent magnetsInductances/transformers/magnets manufactureElectromagnetic energy harvesterCantilever
The invention relates to an electromagnetic energy harvester of a micro electro mechanical system (MEMS) and a preparation method. In the method, a three-dimensional micromachining method combining bulk silicon and surface micromachining technology is adopted, namely, a V-shaped silicon chip groove is etched by bulk silicon micromachining technology; a permanent magnet (array) of the energy harvester is electroplated in the V-shaped groove; diaphragms (a crab claw-shaped cantilever beam and a vibrating plate) and a flat spiral coil of the energy harvester are prepared by the surface micromachining technology. The electromagnetic energy harvester of the invention adopts the electroplating method to prepare the permanent magnet (array) instead of the micro-assembly or adhesion means of the permanent magnet of the traditional energy harvester, so that the energy harvester and preparation thereof can be compatible with the IC process.
Owner:北京大学科技开发有限公司
Magnet suspension-type vibration driving electromagnetic energy harvester
InactiveCN105846641AIncreased sensitivityReduce lossDynamo-electric machinesElectromagnetic energy harvesterMagnetic flux
The invention provides a magnet suspension-type vibration driving electromagnetic energy harvester, which comprises upper and lower planar spiral-shaped coil protection outer shells, a main magnet cavity, a magnetic cylinder accommodating ring, a circular permanent magnet, cylindrical permanent magnets, and upper and lower planar spiral-shaped coils, wherein the circular permanent magnet is in a central suspension state and has an automatic rapid homing function, autonomously vibrates through inducting external vibration, so as to cause changes of magnetic flux of the upper and lower planar spiral-shaped coils, and further can convert external vibration energy into electric energy repeatedly. The design has high sensitivity for the external vibration and low loss in energy conversion process, can acquire slight vibration energy as well as intensive vibration energy, is wide in dynamic range and high in structural stability, and has broad application prospect in implementing a self-power supply operating mode of portable electronic products.
Owner:ZHONGBEI UNIV
Two-degree-of-freedom piezoelectric electromagnetic hybrid energy harvester
ActiveCN107733284AImprove working bandwidthImprove collection efficiencyPiezoelectric/electrostriction/magnetostriction machinesCantilevered beamEngineering
The invention belongs to the technical field of renewable energy and miniature power generation, and particularly relates to a two-degree-of-freedom piezoelectric electromagnetic hybrid energy harvester. The energy harvester at least comprises a U-shaped cantilever beam, magnets, a detachable fixture, a frame, a coil, a cylinder, a fixed fixture and a spring; the U-shaped cantilever beam is composed of a first piezoelectric cantilever beam and a second piezoelectric cantilever beam, the opening end of the U-shaped cantilever beam is fixedly connected with the vertical wall of the frame, and the free end of the U-shaped cantilever beam is fixedly connected with the first magnet; a piezoelectric energy harvester body is formed by the U-shaped cantilever beam, the detachable fixture and the first magnet; the coil is formed by winding enameled wires along the right half part of the outer wall of the cylinder; the cylinder is fixedly connected with the vertical wall of the frame; the fixedfixture is used for clamping the second magnet; the homopolar parts of the second magnet and the first magnet are opposite to each other; an electromagnetic energy harvester body is formed by the fixed fixture, the second magnet, the spring and the coil. The two-degree-of-freedom piezoelectric electromagnetic hybrid energy harvester has the advantages of being simple and compact in structure, highin energy collection efficiency and low in use cost.
Owner:XIDIAN UNIV
Miniature electromagnetic swing-type energy harvester
The invention relates to a miniature electromagnetic swing-type energy harvester, especially an energy harvester which employs mechanical swinging and electromagnetic induction principles, and belongs to the technical field of new energy and power generation. The interior of a housing is provided with a drive device, a supporting spring, an electromagnetic power generation device, an energy storage circuit, a switch, and an output interface. The drive device and the electromagnetic power generation device carry out transmission in a gear mode. The electromagnetic power generation device is connected with the switch and the energy storage circuit, and the energy storage circuit is connected with an output interface. The energy harvester employs the half-gear mechanical reciprocating rotation of the drive device and the magnetic induction line cutting motion of the power generation device for power generation. Compared with a conventional electromagnetic energy harvester, the energy harvester is more reliable and stable. Moreover, the energy harvester can make the most of the motion of a human body or the vibration of an environment, and enables the swinging kinetic energy to be converted into electric energy. The energy harvester employs a closed-type structure, avoids a housing seam needed for the replacement of a cell, and meets the requirements of application in a severe environment.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Electromagnetic energy harvester based on dynamic vibration absorber
InactiveCN109951044ASmall impact on structureSimple structureNon-rotating vibration suppressionDynamo-electric machinesMechanical energyEngineering
The invention provides an electromagnetic energy harvester based on a dynamic vibration absorber. The electromagnetic energy harvester comprises a vibration absorber portion and an energy collecting circuit portion. The vibration absorber portion comprises a magnet, a non-magnetic spring, a non-magnetic sleeve, a coil and a base, wherein the base is connected to the sleeve, the coil is wound around the sleeve, and the magnet is connected to a vibrating structure by a spring. The energy collecting circuit portion is an SS-SSHI energy collecting circuit for energy collection, and the energy supply to different devices is realized by changing the load resistance in the circuit. A vibration object is fixedly connected to the spring, the generated mechanical energy is converted into the kineticenergy of the magnet, the spring drives the magnet to reciprocate in the coil, so that the coil cuts magnetic lines of force for magnetoelectric conversion to generate a current, the current suppliesenergy to a load device through the energy collecting circuit, and therefore, the vibration absorber absorbs the vibration energy of a vibration structure and converts the vibration energy into available electric energy. According to the electromagnetic energy harvester, while the dynamic vibration absorber is used to perform vibration reduction on the vibration structure, the vibration energy absorbed by the vibration absorber is converted and collected to be the available electric energy.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Electromagnetic energy harvester with flexible substrate and method for preparing electromagnetic energy harvester
InactiveCN102723839ASmall sizeReduce spacingDecorative surface effectsDynamo-electric machinesBiological bodyEngineering
The invention provides an electromagnetic energy harvester. The electromagnetic energy harvester comprises a cavity which is formed by a flexible structural layer, and a permanent magnet block which is packaged in the cavity, wherein the flexible structural layer comprises the flexible substrate, and planar coils and a permanent magnet array, which are positioned on the flexible substrate; the permanent magnet array is prepared by using an electroplating method; and the cavity is formed in a folding mode preferably. The energy harvester is compatible with an integrated circuit (IC) process and can be applied to special environment in which device deformation is required. When the flexible substrate is made of a flexible material with bio-compatibility, the energy harvester can be applied to organisms such as built-in bio-sensors, biomedical monitoring and living organism detection.
Owner:PEKING UNIV
Novel electromagnetic energy harvester based on vibration of magnetic ball
PendingCN107707095AImprove output performanceReduce usageDynamo-electric machinesDischarge efficiencySmall amplitude
The invention is a novel electromagnetic energy harvester based on vibration of a magnetic ball, comprising an elastic base, a blocking spring plate, a fixed magnet, a coil, a spherical magnet, an external frame and an upper substrate. The coil is fixed on the elastic base; the blocking spring plate is fixed inside the outer frame and between the coil and the fixed magnet; the spherical magnet hastwo different magnetic poles up and down; the fixed magnet is facing the coil and mutually attracts with the spherical magnet to ensure that the spherical magnet does not rotate when it moves; and there are two vents in the upper part of the upper substrate to ensure that the internal air of the energy harvester cannot disturbs due to the full closure to affect the movement of the magnet. The energy harvester has a simple structure, is easy to manufacture, can be applied to a random, low-frequency, small-vibration environment and has enhanced environmental adaptability. The free-springing design of the spherical magnet increases the contact area between the magnet and the coil, reduces the design space, improves the discharge efficiency, and facilitates the miniaturized design.
Owner:张家港安济能电子科技有限公司
Electromagnetic energy harvester for converting vibration and linear reciprocating motion into rotary motion
ActiveCN110649763AIncrease output powerWorking frequency bandwidthMechanical energy handlingReciprocating motionEngineering
The invention belongs to the technical field of renewable energy sources and micro-miniature power generation, and particularly relates to a two-degree-of-freedom electromagnetic energy harvester forconverting vibration and linear reciprocating motion into rotary motion. The device is characterized in that the device at least comprises a base, a rotor, a top cover, a spring, a rope, magnets, a coil, a radial bearing and ferromagnetic patches; the radial bearing is fixedly connected with a cylindrical shaft; the rotor is fixedly connected with the outer ring of the radial bearing; the two endsof the spring are fixedly connected with the top cover and the base respectively to support the top cover to move up and down; the plurality of groups of magnets are fixed to the rotor; and the two ferromagnetic patches are fixed on the outer cylindrical surface of a cylinder. When external excitation acts on the top cover, the rope drives the rotor to rotate, the magnets fixed to the rotor and the coil move relative to each other, and electric energy is continuously output through the electromagnetic induction principle. The energy harvester has the characteristics of being high in output power, wide in working frequency band, free of influence of the placing direction, wide in application range and the like.
Owner:XIDIAN UNIV
Two-dimensional piezoelectric electromagnetic hybrid energy harvester
ActiveCN107834902ASimple structureCompact structurePiezoelectric/electrostriction/magnetostriction machinesDynamo-electric machinesCantileverElectromagnetic energy harvester
The invention belongs to the technical field of renewable energy sources and micro-miniature power generation, and particularly relates to a two-dimensional piezoelectric electromagnetic hybrid energyharvester which at least comprises piezoelectric cantilever beams, a magnet, a frame, a coil, a cylinder, a fixed clamp and a spring; wherein the piezoelectric cantilever beams comprise a first piezoelectric cantilever beam and a second piezoelectric cantilever beam, the fixed ends of the piezoelectric cantilever beams are fixedly connected with the vertical wall of the frame, and the free ends of the piezoelectric cantilever beams are fixedly connected with the magnet; the piezoelectric cantilever beams and the magnet form a piezoelectric energy harvester; the coil is formed by winding an enameled wire along the right half part of the outer wall of the cylinder; the cylinder is fixedly connected with the vertical wall of the frame; and the fixed clamp, the magnet, the spring and the coilform an electromagnetic energy harvester. The two-dimensional piezoelectric electromagnetic hybrid energy harvester is simple and compact in structure. Vibration energy can be collected from two orthogonal directions, and the energy collection efficiency is high.
Owner:XIDIAN UNIV
Energy management circuit supplying power to wireless sensor of piezoelectric electromagnetic composite energy harvester
ActiveCN108879919AImprove storage efficiencyImprove utilization efficiencyBatteries circuit arrangementsElectric powerCapacitanceLine sensor
The invention discloses an energy management circuit supplying power to a wireless sensor of a piezoelectric electromagnetic composite energy harvester. Currently, no energy management circuit which is used for integrating alternating current of the piezoelectric electromagnetic energy harvester into a path and efficiently supplying power to the wireless sensor. An energy collection circuit of thepiezoelectric energy harvester is used for converting the alternating current of the piezoelectric energy harvester to direct current after rectification and voltage stabilization, the energy collection circuit of the electromagnetic energy harvester is used for rectifying and filtering the alternating current of the electromagnetic energy harvester and converting the alternating current to the direct current by a diode and by voltage rising and stabilization, an output end of the energy collection circuit of the piezoelectric electromagnetic energy harvester is connected with a positive electrode of a supercapacitor by a diode, an energy sensing interface circuit supplies power to the wireless sensor when voltages of two ends of the supercapacitor are higher than a reset threshold, and the connection between the supercapacitor and the wireless sensor is cut off when the voltages of the two ends of the supercapacitor are lower than a working voltage of the wireless sensor. The alternating current of the piezoelectric electromagnetic energy harvester is integrated to one path for storage, and the power supply demands of a large part of wireless sensors are satisfied.
Owner:HANGZHOU DIANZI UNIV
Sectional type bicrystal piezoelectric-electromagnetic composite energy harvester
InactiveCN112421985ANovel structureFlexible designPiezoelectric/electrostriction/magnetostriction machinesDynamo-electric machinesCantilevered beamPiezoelectric cantilever
The invention discloses a sectional type bicrystal piezoelectric electromagnetic composite energy harvester, belongs to the technical field of vibration energy harvesting, and aims to solve a problemthat when a cantilever beam of a traditional piezoelectric electromagnetic energy harvester is subjected to second-order bending vibration, charges of a piezoelectric plate on one side of the cantilever beam are counteracted; and a suspended magnet adopts a linear bearing to limit a motion trail, so that the output of the piezoelectric electromagnetic energy harvester is more stable and efficient.One end of a horizontal piezoelectric cantilever beam is connected with a left stand column of a fixed supporting base through a connecting plate, the upper surface and the lower surface of the otherend of the horizontal piezoelectric cantilever beam are connected with magnets respectively, and the lower surface of an upper cross beam and the upper surface of a lower cross beam of a right standcolumn of the fixed supporting base are connected with a magnet and a coil assembly respectively. And a magnet is suspended in each of the two coil assemblies. The sectional type bicrystal piezoelectric electromagnetic composite energy harvester has the advantages that the structure is novel, the design is flexible, a method for attaching piezoelectric patches to second-order bending vibration nodes on the upper surface and the lower surface of the horizontal piezoelectric cantilever beam in a sectional mode is provided, and the energy harvesting efficiency and performance are improved.
Owner:HARBIN INST OF TECH
Cord-driven two-degree-of-freedom electromagnetic energy harvester
ActiveCN110635620AMitigation of Resonant Frequency MismatchIncrease output powerMechanical energy handlingReciprocating motionNew energy
The invention relates to a cord-driven two-degree-of-freedom electromagnetic energy harvester and belongs to the technical field of new energy and micro power generation. The energy harvester is characterized by at least comprising a base, a supporting cylinder, a top cover, a spring, a rotor, a cord, a guide rod, four magnets and four coils, wherein the supporting cylinder comprises a large counter bore, a small counter bore and four supporting cylinder grooves, the large counter bore is located at a bottom face of the supporting cylinder and is coaxial with the supporting cylinder, the smallcounter bore is formed on a top surface of the supporting cylinder and is coaxial with the supporting cylinder, the four supporting cylinder grooves are evenly distributed on a side face of the supporting cylinder, a lower end of the spring is fixedly connected with the small counter bore of the supporting cylinder, and the large counter bore of the supporting cylinder is sleeved on a cylinder ofthe base to connect the spring with the base. The energy harvester is advantaged in that the rotor is driven by a code, external low-frequency vibration, linear reciprocating motion, pressing motionand other excitations can be converted into high-speed rotating motion of the rotor, and the motor has advantages of wide working frequency band, large output power, wide application range and the like.
Owner:XIDIAN UNIV
Array type piezoelectric-electromagnetic energy harvester based on fluid excitation
ActiveCN112234865AReach generator modeHigh voltagePiezoelectric/electrostriction/magnetostriction machinesMechanical energy handlingWater flowEngineering
The invention discloses an array type piezoelectric-electromagnetic energy harvester based on fluid excitation. The array type piezoelectric-electromagnetic energy harvester is used for a power generation device for directly collecting water energy. The device is composed of a shell, a piezoelectric vibrator, a rectangular magnet, a circular magnet, an electromagnetic coil, a shell end cover, a connecting rod, a driving fan and a fixed base plate. The fan is driven by a water flow to rotate so as to drive the base to rotate, a circle of the bottom surface of a stepped shaft is internally tangent to the circle of the bottom surface of the base so as to form a crank-link mechanism with the connecting rod to enable the circular magnet to perform piston motion in the shell, and the circular magnet and the electromagnetic coil in the shell perform magnetic induction line cutting motion so as to perform electromagnetic power generation. When the circular magnet is close to the rectangular magnet, a magnetic coupling effect is generated to deform the piezoelectric vibrator to generate charges on the surface; a piezoelectric-electromagnetic power generation mode is achieved; and piezoelectric power generation and electromagnetic power generation are carried out at the same time, and the voltage generated by energy harvesting can reach the maximum within a short time.
Owner:CHANGCHUN UNIV OF TECH
An electromagnetic energy harvester
ActiveCN110649763BIncrease output powerWorking frequency bandwidthMechanical energy handlingReciprocating motionRotor (electric)
Owner:XIDIAN UNIV
Cable-driven rotary electromagnetic energy harvester
The invention belongs to the technical field of new energy and power generation, and particularly relates to a cable-driven rotary electromagnetic energy harvester which can be used for collecting mechanical energy such as vibration and swing in the environment and converting the mechanical energy into electric energy. The device mainly comprises a central rotating shaft, a rotor, an elastic cableand a non-elastic cable, wherein the central rotating shaft is fixedly connected with the rotor, the elastic cable and the non-elastic cable are wound on the central rotating shaft in opposite winding directions, and a magnet can be embedded into the rotor and interacts with a coil to generate an inductive current. The cable-driven rotary electromagnetic energy harvester can be used for supplyingpower to low-power electronic equipment (such as a micro sensor, small mobile equipment, an environment monitoring network and the like), and can be placed in complex environments with vibration sources, such as vibration machines, sea wave floaters and elastic floors. In addition, the cable-driven rotary electromagnetic energy harvester is simple in structure, easy to process, high in output power and wide in working frequency band.
Owner:XIDIAN UNIV
A two-degree-of-freedom electromagnetic energy harvester driven by a wire rope
ActiveCN110635620BStrong pullMitigation of Resonant Frequency MismatchMechanical energy handlingReciprocating motionNew energy
The invention relates to a wire-driven two-degree-of-freedom electromagnetic energy harvester, which belongs to the technical field of new energy and miniature power generation. Rod, four magnets, four coils; the supporting cylinder includes a large counterbore, a small counterbore and four supporting cylinder grooves; the large counterbore is located on the bottom surface of the supporting cylinder and is coaxial with the supporting cylinder; the small The counterbore is located on the top surface of the support cylinder and is coaxial with the support cylinder; the four support cylinder grooves are evenly distributed on the side of the support cylinder; the lower end of the spring is fixedly connected with the small counterbore of the support cylinder, while the support cylinder The large counterbore is overlaid on the cylinder of the base to connect the spring with the base. The invention drives the rotor by wires, and can convert external low-frequency vibration, linear reciprocating motion, pressing motion and other excitations into high-speed rotating motion of the rotor, and has the characteristics of wide operating frequency, large output power, and wide application range.
Owner:XIDIAN UNIV
A small electromagnetic swing energy harvester
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
A kind of electromagnetic mems vibration energy harvester and preparation method thereof
ActiveCN105162291BImprove energy harvesting efficiencyEfficient collectionDecorative surface effectsManufacturing dynamo-electric machinesHigh energySpiral inductor
The invention discloses an electromagnetic MEMS vibration energy harvester and a preparation method thereof. After preparing grooves and respective inductance line layers on two substrates, the two substrates are combined so that the grooves are formed to accommodate The cavity of the moving permanent magnet enables the respective inductance lines to be connected in a bridging manner to form a spiral inductance. In the vibration environment, the vibration pickup structure of the electromagnetic energy harvester can move freely in the cavity, which is a non-resonant vibration pickup structure. Compared with the resonant vibration pickup structure in the traditional energy electromagnetic harvester, its motion The case is less affected by the frequency of environmental vibrations and can respond to environmental vibrations in different directions. No matter how the vibration frequency and vibration direction change, the energy harvester of the present invention can efficiently collect vibration energy and convert it into electrical energy, so it has high energy collection efficiency, and has the advantages of low manufacturing cost and good consistency.
Owner:SOUTHEAST UNIV
An array piezoelectric-electromagnetic energy harvester based on fluid excitation
ActiveCN112234865BReach generator modeHigh voltagePiezoelectric/electrostriction/magnetostriction machinesMechanical energy handlingMagnetic tension forceCrank
The invention discloses an array type piezoelectric-electromagnetic energy harvester based on fluid excitation, which is used as a power generation device for directly collecting water energy; it consists of a casing, a piezoelectric vibrator, a rectangular magnet, a circular magnet, an electromagnetic coil, and a casing Composed of end cover, connecting rod, driving fan and fixed base plate; using water flow to drive the fan to drive it to rotate, thereby driving the base to rotate, the circle on the bottom surface of the stepped shaft is inscribed with the circle on the bottom surface of the base to form a crank linkage mechanism with the connecting rod When the circular magnet moves as a piston in the casing, the circular magnet will cut the magnetic induction line with the electromagnetic coil in the casing to generate electromagnetic power; when the circular magnet is close to the rectangular magnet, it will produce magnetic coupling to deform the piezoelectric vibrator. Charges are generated on its surface; piezoelectric-electromagnetic power generation mode is achieved; piezoelectric power generation and electromagnetic power generation are carried out simultaneously, and the voltage generated by energy capture can reach the maximum in a short time.
Owner:CHANGCHUN UNIV OF TECH
Piezoelectric electromagnetic hybrid energy harvester energy management circuit for powering wireless sensors
ActiveCN108879919BImprove storage efficiencyImprove utilization efficiencyBatteries circuit arrangementsElectric powerCapacitanceLine sensor
The invention discloses an energy management circuit supplying power to a wireless sensor of a piezoelectric electromagnetic composite energy harvester. Currently, no energy management circuit which is used for integrating alternating current of the piezoelectric electromagnetic energy harvester into a path and efficiently supplying power to the wireless sensor. An energy collection circuit of thepiezoelectric energy harvester is used for converting the alternating current of the piezoelectric energy harvester to direct current after rectification and voltage stabilization, the energy collection circuit of the electromagnetic energy harvester is used for rectifying and filtering the alternating current of the electromagnetic energy harvester and converting the alternating current to the direct current by a diode and by voltage rising and stabilization, an output end of the energy collection circuit of the piezoelectric electromagnetic energy harvester is connected with a positive electrode of a supercapacitor by a diode, an energy sensing interface circuit supplies power to the wireless sensor when voltages of two ends of the supercapacitor are higher than a reset threshold, and the connection between the supercapacitor and the wireless sensor is cut off when the voltages of the two ends of the supercapacitor are lower than a working voltage of the wireless sensor. The alternating current of the piezoelectric electromagnetic energy harvester is integrated to one path for storage, and the power supply demands of a large part of wireless sensors are satisfied.
Owner:HANGZHOU DIANZI UNIV
A Cable Driven Rotary Electromagnetic Energy Harvester
ActiveCN110649762BSimple structureEasy to processMechanical energy handlingNew energyLow-power electronics
The invention belongs to the technical field of new energy and power generation, and in particular relates to a cable-driven rotary electromagnetic energy harvester, which can be used to collect mechanical energy such as vibration and swing in the environment and convert it into electrical energy. The device mainly includes: a central rotating shaft, a rotor, elastic cables and non-elastic cables; wherein, the central rotating shaft and the rotor are fixedly connected, and the elastic cables and non-elastic cables are respectively wound on the central rotating shaft with opposite winding directions; magnets can be embedded in the rotor and Interacting with the coil produces an induced current. The invention can be used to supply power to low-power electronic devices (such as micro sensors, small mobile devices, environmental monitoring networks, etc.), and can be placed in complex environments such as vibrating machinery with vibration sources, sea wave floats, and elastic floors. In addition, the invention has simple structure, easy processing, high output power and wide operating frequency range.
Owner:XIDIAN UNIV
Method for preparing electromagnetic energy harvester using micro-nano processing technology
ActiveCN103011061BIncrease the output voltageAchieve optimizationDecorative surface effectsDynamo-electric machinesAlloyElectromagnetic energy harvester
The invention relates to the production field of micromechanical systems, in particular to the technical field of micro-nanometer machining, and more in particular to a production method for a vibration energy collector capable of being integrally processed. The method comprises the steps of optional selection of processing substrates, electroplating of Cu coils, electroplating of Cu support poles, electroplating of Cu vibration plates and foldable beams, electroplating of permanent magnet arrays, degumming, and removing seed layers to obtain the electromagnetic energy collector through cutting. The energy collector can improve output voltage through serial connection of coils. The requirements of overall integration processing can be metthrough the preparation of permanent magnet CoNiMnP alloys. And at the same time, the novel structural design largely improves the output voltage of the energy collector, and largely improves the energy collecting efficiency. Meanwhile, the optimization of the energy collector can be achieved through changing geometric sizes and arrangement positions of the permanent magnet arrays. And the change of the output voltage and resonant frequency can be achieved through changing the thicknesses and the lengths of the vibration plates and the foldable beams.
Owner:PEKING UNIV
Electromagnetic energy harvester with flexible substrate and method for preparing electromagnetic energy harvester
InactiveCN102723839BSmall sizeReduce spacingDecorative surface effectsDynamo-electric machinesBiological bodyEngineering
The invention provides an electromagnetic energy harvester. The electromagnetic energy harvester comprises a cavity which is formed by a flexible structural layer, and a permanent magnet block which is packaged in the cavity, wherein the flexible structural layer comprises the flexible substrate, and planar coils and a permanent magnet array, which are positioned on the flexible substrate; the permanent magnet array is prepared by using an electroplating method; and the cavity is formed in a folding mode preferably. The energy harvester is compatible with an integrated circuit (IC) process and can be applied to special environment in which device deformation is required. When the flexible substrate is made of a flexible material with bio-compatibility, the energy harvester can be applied to organisms such as built-in bio-sensors, biomedical monitoring and living organism detection.
Owner:PEKING UNIV
Low Frequency Vibration Electromagnetic Energy Harvester
ActiveCN106803726BIncreased Low Frequency Energy Harvesting BandwidthPiezoelectric/electrostriction/magnetostriction machinesCantilevered beamParticle physics
The invention provides a low-frequency vibration electromagnetic energy harvesting device. The device includes an energy collector housing, a cantilever beam elongated plate, a cantilever beam short plate, a collision mass block, a magnetic field generation piece and a multi-turn coil. The environment is vibrated so as to provide vibration excitation to the energy collector housing. The cantilever beam elongated plate and the cantilever beam short plate vibrate along with the vibration excitation. The collision mass block collides with the cantilever beam elongated plate at a preset position of the cantilever beam elongated plate, such that the cantilever beam elongated plate generates vibration at a frequency close to the inherent frequency of the cantilever beam elongated plate. The multi-turn coil and the cantilever beam elongated plate vibrate at the same frequency. When a magnetic induction line is cut, an electrical signal is generated. According to the invention, the electromagnetic energy collector can collect low-frequency vibration electromagnetic energy, and greatly increases low-frequency energy harvest bandwidth of an electromagnetic cantilever beam structure.
Owner:TSINGHUA UNIV
an energy harvester
ActiveCN104953785BIncreased energy output densityEfficient outputDynamo-electric machinesFriction generatorsEngineeringLow frequency vibration
The invention discloses an energy harvester, comprising: an energy harvester shell, a coil with a preset number of turns wound on the outer wall of the energy harvester shell, an opening is arranged at the upper end of the energy harvester shell; a vibrating plate, The vibrating plate is provided with a vibrating part that responds to external vibrations. The vibrating plate covers the opening at the upper end of the energy harvester shell, and the vibrating plate is fixedly connected to the energy harvester shell; the magnet block is located inside the energy harvester shell, and the magnet block Connected with the vibrating plate; the first friction layer, the first friction layer is located at the lower end of the magnet block, and the first friction layer is fixedly connected with the magnet block; the second friction layer, the second friction layer is arranged on the inner bottom surface of the energy harvester housing Above, the second friction layer is arranged opposite to the first friction layer according to a preset collision distance. The two energy harvesting methods of friction and electromagnetic work at the same time, which improves the energy output density of the device and realizes efficient energy harvesting and output in a low-frequency vibration environment.
Owner:SUZHOU UNIV
An Energy Harvesting Circuit for Piezoelectric-Electromagnetic Composite Energy Harvesters
ActiveCN105099272BMake up for the lack of powerConvenient power supplyPiezoelectric/electrostriction/magnetostriction machinesDynamo-electric machinesElectricityPower flow
The invention discloses an energy collection circuit for a piezoelectric-electromagnetic composite energy harvester, relates to an energy collection circuit for an energy harvester, and belongs to the technical field of new energy and power generation. The invention includes an electromagnetic energy harvester energy collection circuit, a piezoelectric energy harvester energy collection circuit, and a charging circuit for realizing composite charging and preventing current backflow. The energy harvesting circuit of the electromagnetic energy harvester is used to increase the output voltage of the electromagnetic energy harvester and reduce the output current, thereby increasing the output power. The energy harvesting circuit of the piezoelectric energy harvester is used to reduce the output voltage of the piezoelectric energy harvester, increase the output current, and thereby increase the output power. The output voltage of the energy harvesting circuit of the electromagnetic energy harvester and the piezoelectric output of the energy harvesting circuit of the piezoelectric energy harvester match the charging voltage of the rechargeable battery. The invention can realize the conversion of alternating current into direct current and supply power to the load, that is, the piezoelectric-electromagnetic composite energy harvester can directly supply power to the load, thereby increasing the output power.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
A two-dimensional piezoelectric electromagnetic hybrid energy harvester
ActiveCN107834902BSimple structureCompact structurePiezoelectric/electrostriction/magnetostriction machinesDynamo-electric machinesElectricityPiezoelectric cantilever
The invention belongs to the technical field of renewable energy sources and micro-miniature power generation, and particularly relates to a two-dimensional piezoelectric electromagnetic hybrid energyharvester which at least comprises piezoelectric cantilever beams, a magnet, a frame, a coil, a cylinder, a fixed clamp and a spring; wherein the piezoelectric cantilever beams comprise a first piezoelectric cantilever beam and a second piezoelectric cantilever beam, the fixed ends of the piezoelectric cantilever beams are fixedly connected with the vertical wall of the frame, and the free ends of the piezoelectric cantilever beams are fixedly connected with the magnet; the piezoelectric cantilever beams and the magnet form a piezoelectric energy harvester; the coil is formed by winding an enameled wire along the right half part of the outer wall of the cylinder; the cylinder is fixedly connected with the vertical wall of the frame; and the fixed clamp, the magnet, the spring and the coilform an electromagnetic energy harvester. The two-dimensional piezoelectric electromagnetic hybrid energy harvester is simple and compact in structure. Vibration energy can be collected from two orthogonal directions, and the energy collection efficiency is high.
Owner:XIDIAN UNIV
Electromagnetic field energy collection device and communication device
ActiveCN104539028BBatteries circuit arrangementsElectric powerCommunications systemElectromagnetic shielding
The invention discloses an electromagnetic field energy collection device, which includes a coupler, an isolator, a rectifier unit and an energy storage unit connected in sequence, the coupler is used to receive electromagnetic field signals and convert the electromagnetic field signals into circuit signals, and the isolator is used to convert the circuit signals Transmitted to the rectifier unit and used to prevent the interference signal from the rectifier unit from being transmitted to the coupler, the rectifier unit is used to convert the circuit signal into a DC signal as DC energy, the energy storage unit is used to store the DC energy output by the rectifier unit and used for Output DC energy. The above-mentioned electromagnetic field energy harvesting device isolates the noise generated by the circuit after the isolator from the coupler by setting the isolator, so that the noise from the subsequent circuit, such as the rectifier, cannot be radiated through the coupler, avoiding damage to the nearby communication antenna. Interference, thereby ensuring the performance of the communication system. The invention also discloses a communication device.
Owner:JIANGSU EAST CENTURY NETWORK INFORMATION +1
A Piezoelectric-Electromagnetic Composite Energy Harvester
InactiveCN105141181BWorks well when placed horizontallyIncrease energy densityPiezoelectric/electrostriction/magnetostriction machinesDynamo-electric machinesDaily livingElectricity
The invention discloses a piezoelectric-electromagnetic compound energy accumulator and relates to piezoelectric-electromagnetic compound energy accumulator for improving an output power on the environment vibration condition, wherein the energy accumulator belongs to the technical field of the new energy and power generation. The energy accumulator is composed of a shell, coils, an upper permanent magnet, a piezoelectric ceramic material, a base beam, a conical permanent magnet, a lower permanent magnet, an upper electrode, a piezoelectric plate, a lower electrode, a left piezoelectric plate upper electrode lead, and a right piezoelectric plate upper electrode lead. A piezoelectric accumulation part and an electromagnetic accumulation part share the shell, the base beam, an upper permanent magnet, the lower permanent magnet, and the conical permanent magnet. According to the invention, the piezoelectric-electromagnetic compound energy accumulator has advantages of good green and pollution-free performances, large energy density, high reliability and environment adaptability, convenient operation and control, and low maintenance cost and the like. Problems of poor compatibility, low energy density, complex circuit connection, and inconvenient maintenance and the like of the conventional energy process can be solved. The piezoelectric-electromagnetic compound energy accumulator can be applied to energy supplying in a daily living vibration environment and severe environments of underground oil exploration and mining and the like and also can be used as an emergency standby power source.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
A two-degree-of-freedom piezoelectric-electromagnetic hybrid energy harvester
ActiveCN107733284BSimple structureCompact structurePiezoelectric/electrostriction/magnetostriction machinesElectricityCantilevered beam
The invention belongs to the technical field of renewable energy and miniature power generation, and particularly relates to a two-degree-of-freedom piezoelectric electromagnetic hybrid energy harvester. The energy harvester at least comprises a U-shaped cantilever beam, magnets, a detachable fixture, a frame, a coil, a cylinder, a fixed fixture and a spring; the U-shaped cantilever beam is composed of a first piezoelectric cantilever beam and a second piezoelectric cantilever beam, the opening end of the U-shaped cantilever beam is fixedly connected with the vertical wall of the frame, and the free end of the U-shaped cantilever beam is fixedly connected with the first magnet; a piezoelectric energy harvester body is formed by the U-shaped cantilever beam, the detachable fixture and the first magnet; the coil is formed by winding enameled wires along the right half part of the outer wall of the cylinder; the cylinder is fixedly connected with the vertical wall of the frame; the fixedfixture is used for clamping the second magnet; the homopolar parts of the second magnet and the first magnet are opposite to each other; an electromagnetic energy harvester body is formed by the fixed fixture, the second magnet, the spring and the coil. The two-degree-of-freedom piezoelectric electromagnetic hybrid energy harvester has the advantages of being simple and compact in structure, highin energy collection efficiency and low in use cost.
Owner:XIDIAN UNIV
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