35 results about "Electromagnetic energy harvester" patented technology

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.

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.

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.

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.

The invention belongs to the technical field of renewable energy and micro-miniature power generation, and in particular relates to a two-degree-of-freedom electromagnetic energy harvester that converts vibration and linear reciprocating motion into rotational motion. The device is characterized by at least comprising a base, a rotor, a Top cover, spring, wire rope, magnet, coil, radial bearing, ferromagnetic patch; the radial bearing is fixedly connected with the cylindrical shaft; the rotor is fixedly connected with the outer ring of the radial bearing; the two ends of the spring are respectively connected with the top cover It is fixedly connected with the base to support the top cover to move up and down; several groups of magnets are fixed on the rotor; two ferromagnetic patches are fixed on the outer cylindrical surface of the cylinder; when the external excitation acts on the top cover, the rope will drive the rotor to rotate , the magnets fixed on the rotor and the coils move relative to each other, and continuously output electric energy through the principle of electromagnetic induction; the energy harvester has the characteristics of large output power, wide operating frequency, not affected by the placement direction, and wide application range.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.