652 results about "Piezoelectric generator" patented technology

A self-powered medical device, for example a pacemaker uses the variations of blood pressure inside the heart or a major artery to create a mechanical resonance in an electromagnetic or piezoelectric generator. The resonance extends the time power is generated during the cardiac cycle. The pressure variations compress a bellows carrying the resonant generator. The inside of the bellows may be evacuated to a partial or full vacuum, and a spring restores the bellows to the desired equilibrium point, acting against the blood pressure. The current pulses are stored in a capacitor. Eliminating the battery allows dramatic miniaturization of the medical device to the point it can be implanted at the point of desired stimulation via a catheter.

A touch screen monitor having a display monitor and an ultrasonic device. The ultrasonic device may include a sensor array using piezoelectric sensors to detect the surface topology of a biological or other object that is in contact with a surface of the display monitor. The display monitor may be a LCD or LED monitor.

Energy harvesting systems and methods that use multiple piezoelectric generators connected to the same energy harvesting circuit with minimal or no energy loss. The piezoelectric energy harvesting system may include individual diode bridge circuits electrically connected to the outgoing wires from each piezoelectric generator. The piezoelectric energy harvesting system may include multiple subsystems each having one or more individual diode bridges electrically connected to the outgoing wires from multiple piezoelectric generators. Multiple subsystems, each having multiple piezoelectric generators and a diode bridge, may be electrically connected to the same energy harvesting circuit. The use of multiple piezoelectric generators connected to the same energy harvesting circuit results in improved energy harvesting capabilities, and a simplified and low cost energy harvesting system.

A thermoacoustic generator includes a housing with a thermoacoustic core supported in the housing. The core is operable to introduce acoustical power into the housing to thereby oscillate the pressure of the gas in the housing at a frequency. A piezoelectric alternator is also supported in the housing and has a face that is movable when acted on by the acoustical power. The alternator includes a portion of piezoelectric material operable to produce electrical power when acted upon by a stress. The piezoelectric material is in mechanical communication with the movable face so that movement of the face stresses the piezoelectric material. The alternator has a moving mass that serves as a substantial portion of the resonating mass inside the housing, thereby providing a pressure oscillation frequency in the housing substantially lower than for a similar system with a rigid member replacing the alternator.

A micro-sized power source. A piezoelectric power generator, capable of harvesting energy from environmental vibration with lower level frequency, including a dielectric frame loosely containing a piezoelectric panel. The piezoelectric panel includes an electrode and a piezoelectric layer formed over an electrode and dielectric layer and an end mass formed on the piezoelectric layer. The end mass provides weight to cause the piezoelectric panel to move (vibrate) within the frame and causes the generation of electrical power.

Provided is a small piezoelectric power generator applied to a wireless sensor network system of a tire pressure monitoring system (TPMS) for monitoring an internal environment of a tire such as variation in air pressure in the tire. In particular, when the system, in which air pressure, temperature and acceleration sensors are mounted, installed in the tire is operated in the TPMS for an automobile, a small piezoelectric power generator for the TPMS can be used as a power source in place of a conventional battery. The piezoelectric power generator includes a substrate having an electrode for transmitting power to the exterior, a metal plate formed on the substrate, and a piezoelectric body disposed on the metal plate and transmitting the power generated by a piezoelectric material to the electrode.

The piezoelectric generator is characterized by providing a spacer member in the vicinity of a fixed end of an elastic plate mounted on a base plate by means of affixing both ends in such a way as to prevent the elastic plate not to be deformed unnecessarily when a load is applied to the elastic plate from above, so that a piezoelectric ceramic plate glued onto the elastic plate generates electric power by the elastic plate's deformation.

The invention relates to a magnetic force coupling axial excitation-based rotary disk type piezoelectric generator which belongs to the field of piezoelectric power generator. A bearing and a magnet I are embedded on a lathe box body, a rotating shaft is arranged on the lathe box body through the bearing, two sides of a shaft shoulder of the rotating shaft are respectively provided with a rotating disk and a monitoring system, a piezoelectric vibrator is arranged on the rotating disk and is formed by adhering a magnetic metal substrate and a piezoelectric wafer, the piezoelectric vibrator is connected with the monitoring system through a lead group, the flange end of a magnet frame is arranged on the lathe box body through a screw, a magnet II is embedded on the inner side of the bottom end of the magnet frame, and different magnetic poles of the magnet I and the magnet II are installed close to the piezoelectric vibrator. The invention has the advantages that the piezoelectric vibrator of the magnetic metal substrate is placed on the shaft and is coupled and axially excited through a magnetic force without contact impaction, noise and impact damage, electric energy is directly supplied to the monitoring system rotating with the shaft' and the piezoelectric vibrator is axially bent and deformed and the power generation quantity is not influenced by the rotating state, and power can be generated at constant speed and high speed.

The invention relates to a piezoelectric generator collecting energy of bending vibration and pertains to the technical field of piezoelectric generators. The piezoelectric generator of the invention is characterized by the adoption of a three-layer structure with two cantilevered piezoelectric ceramic layers and a metal layer, namely, the upper layer and the lower layer of the piezoelectric generator are piezoelectric ceramic layers (1, 2), the polarization direction of which are opposite; the piezoelectric ceramic layers are respectively stuck with a metal layer (3) in the middle by conductive adhesive layers (4, 5) and electrode surfaces (6, 7) of the piezoelectric ceramic layers (1, 2) are connected with a power circuit with functions of rectification and energy collection by conducting wires (8, 9); the metal layer (3) at a fixed end of a piezoelectric device stretches outside the piezoelectric ceramic layers (1, 2) and the piezoelectric device is fixed through the metal layer (3) at the fixed end. The piezoelectric generator of the invention has the advantages of fast responding, low cost, simple structure, no heat emission, and no consumption of any material during operation, etc., and the piezoelectric generator meets the requirement of saving energy and has obvious commercial and social values.

The present invention relates to an apparatus system and method for power harvesting on roads and highways using a piezoelectric generator. The invention is to provide a system and a method for power harvesting comprising a plurality of piezoelectric devices embedded in a road and configured to produce electrical power when a vehicle traverses their locations. The system includes a power conditioning unit and electrical conductors connecting said piezoelectric to said power conditioning unit. Harvested energy may be used locally in proximity to the energy generation location, stored for later use or transferred to be used in remote location

The invention belongs to the technical field of renewable energy sources and power generation, and especially relates to a wind-induced vibration piezoelectric generator which is suitable for low-power-consumption electronic devices, such as microsensors, micro-performers, minisize signal processors and emitters and the like, which need to obtain energy from external environment to carry out energy supplement. The piezoelectric generator is formed by three piezoelectric cantilever beams, a quality block, a fluid-stopping body, permanent magnets, a clamping plate, a support and a bridge rectifier circuit. According to the piezoelectric generator, the principle of galloping of the wind-induced fluid-stopping body and the piezoelectric effect are utilized to enable the wind energy to be converted into electric energy, and the converted electric energy is then stored in an energy storage component through a bridge rectifier. The coupling effect between the inner beam and the outer beam is utilized to enable the vibration energy of the outer energy to be transmitted to the inner beam, thereby not only preventing the outer beam from causing rupture damage due to large deformation, but also improving the output voltage of the inner beam. The piezoelectric generator is simple in structure, low in cost, high in power density, and is suitable for auxiliary power supply of the wireless sensors and low-power-consumption devices.

The invention relates to a bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator and belongs to the field of piezoelectric generation. A cylinder is fixed between two bearing blocks by a bolt; multiple groups of static magnets I and static magnets II are alternately embedded on different cross sections of the internal wall of the cylinder; both the two bearing blocks are embedded with a bearing and a magnetic ring; a main shaft is arranged on the bearing block by the bearing; the spline of the main shaft is sleeved with multiple groups of piezoelectric transducers; and a pair of moving magnets are arranged at the free end of each of the piezoelectric transducers by bolts, and the opposite magnetic poles of the moving magnets are opposite. The piezoelectric generator has the advantages of no contact impact and noise, high reliability, convenience for providing electricity to a monitoring system rotating along with a rotating shaft, and capability of generating power at a constant or high speed.

A multilayer piezoelectric generator is disclosed comprising a round, rectangular or other shaped box having a cover. In the box are top and bottom electrodes and a plurality of electricity generating layers. Each Layer comprises a plurality of piezoelectric rods held in place by a matrix layer that fits snugly in the box and configured to accept shear strains developed in the rods when pressure is applied to the cover. The layers are separated by central electrode layers. The structure is configures such that pressure is evenly spreads among all the rods and causes the rods to make contacts with the electrodes. Rods in adjacent layers are oppositely poled, and the electrodes are configured and wired such that all the rods are connected parallel such that their generated charge is summed. Adaptation of the generator to its application is done by changing the number and thickness of the layers.

An electric power generator includes a conduit disposed in a wellbore penetrating subsurface formations and at least one piezoelectric transducer in contact with the conduit. The piezoelectric transducer is configured to undergo stress in response to vibration in the conduit. The transducer includes a plurality of piezoelectric crystals stacked in a thickness direction and each polarized in the thickness direction. The transducer comprises at least one of a composite rubber layer disposed between successive piezoelectric crystals, and at least one support at a longitudinal end of the transducer configured to cause the crystals to bend in response to vibration in the conduit.

The invention discloses a semi-active magnetic-current variable-piezoelectric feedback type damper, comprising an inner tube and an outer tube. A revolving shaft is arranged in the middle of the innertube, and is fixedly connected with two vanes which are arranged by the angle of 180 degrees in the inner tube. The vanes are hollow and provided with mass blocks inside respectively, the upper and lower ends of each mass block are connected with the inner wall of the corresponding vane through springs. Two thin plates are arranged in the inner tubes and perpendicular to the vanes respectively. The cavity of the inner tube is filled with magnetorheological fluid. Piezoelectric generator units are respectively arranged on the surfaces of the thin plates, and pressure sensors are respectively arranged at the tops of the piezoelectric generator units. The outer wall of the inner tube is wound with a field coil along the axis direction. The pressure sensors, the field coil, a controller and an electric power extracting and storing unit are in series connection to form a closed loop, wherein the controller and the electric power extracting and storing unit are arranged at the top of the inner tube.

The invention relates to a rotary piezoelectric generator for a rail vehicle shafting monitoring system and belongs to the technical field of rail transportation monitoring and piezoelectric generation. A wheel shaft is arranged on a frame by a bearing; the small end of a T-shaped choke block is arranged at the end part of the wheel shaft and is pressed on a bearing inner ring, and the two sides of the large end of the T-shaped choke block are respectively provided with a piezoelectric transducer and a sensing monitoring system which are connected by a wire set; the piezoelectric transducer is formed by bonding a circular metal substrate, a fan-shaped piezoelectric crystal plate and a fan-shaped magnetic sheet; a bearing cap is arranged on the frame by a bolt, and a first static magnet and a second static magnet are inlaid at the internal bottom of the bearing cap, and the configuration directions of the magnetic poles of the first and second static magnets are opposite. The rotary piezoelectric generator has the advantages that the generator rotates along with the shaft so as to supply power for the monitoring system rotating along with the shaft conveniently, the deformation and generation are not affected by the rotation state of the wheel shaft; the generation capability and rotating speed adaptation capability are strong, and the reliability is high.