Some embodiments relate to an energy transduction device or apparatus. An example device or apparatus includes: a piezoelectric transducer; electrical conductors electrically coupled to the piezoelectric transducer; and an axially aligned magnet assembly arranged to apply static compressive force to the piezoelectric transducer, the magnet assembly being coupled to a base at one end and having a free opposite end. The magnet assembly is coaxial with the piezoelectric transducer and at least part of the magnet assembly is concentric with the piezoelectric transducer. The magnet assembly defines a gap between axially adjacent parts of the magnet assembly, wherein the gap is dimensioned to be sufficiently small that the magnet assembly applies a static compressive force to the piezoelectric transducer while being sufficiently large to allow for axial movement of the piezoelectric transducer without closing the gap.

A box-type wind power generation device and a power generation device set is provided, the box-type wind power generation device includes a box body, a first energy collecting unit and a first connection member. The box body includes at least one flexible housing member and at least one rigid housing member which enclose at least one sealed cavity. The first energy collecting unit includes a piezoelectric membrane and electrodes deposited on both sides of the piezoelectric membrane, respectively; the first energy collecting unit overlying on an inner wall of the flexible housing member and are located in the sealed cavity. An end of the first connection member is fixed to the flexible housing member so that the first connection member is connected to the box body and at least a part of the first connection member is located outside the sealed cavity.

Provided is a system for real-time condition diagnosis of a bearing module including a self-power generation module installed in an outer ring of a bearing to generate electricity using vibration generated from a micro whirling motion of the bearing, a behavior detection unit installed in the bearing to detect behavior information of the bearing in real time, a wireless transmission module connected to the behavior detection unit to transmit the real-time detected behavior information of the bearing to an external device, and a condition diagnosis unit that receives the behavior information of the bearing transmitted from the wireless transmission module and diagnoses condition of the bearing in real time, wherein the real-time behavior information of the behavior detection unit installed in the bearing is transmitted through the electricity obtained by the self-power generation module.

Systems and methods of providing power to high-voltage sensors in power-limited environments through environmental energy harvesting are disclosed. The systems and methods are configured to intermittently power high-voltage sensors by repeatedly releasing stored energy in bursts. An environmental energy harvesting device generates a low-voltage power supply and is coupled to one or more capacitors to charge the capacitors to a high-voltage threshold. After such high-voltage threshold has been reached, the capacitors are discharged to provide a high-voltage power burst to a high-voltage sensor configured to inspect a component and generate an inspection result signal. The inspection result signal is received by an output module, which may further store or transmit to an external receiver a data signal indicating the inspection results.

The invention relates to a piezoelectric energy harvesting system (10) configured to be installed on a vehicle (1), characterized in that the system (10) comprises: —an inner panel (12); —an outer panel (14) slidably movable relative to the inner panel (12); —at least one deformable piezoelectric element (16) disposed between the inner panel (12) and the outer panel (14), said piezoelectric element (16) being capable of producing electrical power when it is deformed; —a plurality of impact elements (18) fixedly connected to the outer panel (14) and adapted to apply a compression force on the at least one piezoelectric element (16) when the outer panel (14) and the inner panel (12) are close enough to each other, said compression force causing a mechanical deformation of the at least one piezoelectric element (16); —repulsion means (22) adapted to move the outer panel (14) away from the inner panel (12); —an electrical power storage unit (24); —a one-way electrical circuit (26) connecting the at least one piezoelectric element (16) to the electrical power storage unit (24), said one-way electrical circuit (26) being adapted to charge the electrical power storage unit (24) with the electrical power produced by the at least one piezoelectric element (16) while preventing the application of an electrical charge to the at least one piezoelectric element (16) from the electrical power storage unit (24).

The present application provides a human joint energy harvesting apparatus for capturing the biomechanical energy of a joint to generate electrical energy. The generated electrical energy may provide a real-time power supply to the wearable electronics. The apparatus employs a linear slide rail mechanism and cooperates with the user's first limb and second limb to form a slider-crank mechanism, which converts the rotating motion of the joint into a linear motion of the linear slide rail mechanism. The bending beam converts the linear motion of the linear slide rail mechanism into a bending motion. A piezoelectric film may be bonded to the upper and lower surfaces of the bending beam. During walking, the bending beam is deformed, causing the piezoelectric film to be stretched or compressed to generate electrical energy. To harvest more energy, the bending beam used in the apparatus is designed to be subjected to forced motion and free vibration, and a proof mass is attached to it. The present application also provides a wearable electronic device equipped with the human joint energy harvesting apparatus.

The following relates generally to measuring a patients O.sub.2 level with a mote implanted in the patient's tissue. For example, a mote implanted in a patients tissue may be powered by ultrasound (US) signals generated by an ultrasound interrogator that is external to the patient. Components on the mote may be duty cycled off to advantageously decrease power consumption. A luminescence sensor on the mote may be used to measure the O.sub.2 level, and the luminescence sensor may be optically isolated from the patients tissue by an opaque material such as black silicon.

A vibration power generation device that further improves power generation efficiency includes a vibration exciting body in which vibration is caused by a flowing fluid, a vibrated body that is oscillatable and connected to the vibration exciting body, and a power generator to generate electricity by oscillation of the vibrated body. The vibration exciting body is in proximity to a wall surface, and vibration is caused in the vibration exciting body by a fluid flowing along the wall surface.

Disclosed is a self-powered vibration damper based on piezoelectricity and a control method. The damper comprises a loading platform, an energy collecting mechanism, a curved leaf spring, a vibration control mechanism and a substrate all connected in sequence, the circuit system comprises a rectifier circuit, a DC-DC voltage conversion circuit, an energy storage circuit, a control circuit and a charging battery, a first piezoelectric stack is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the input end of the DC-DC voltage conversion circuit, the output end of the DC-DC voltage conversion circuit is connected with the input ends of the energy storage circuit and the charging battery, the output end of the energy storage circuit is connected with the input end of the control circuit, the output end of the control circuit is connected with the second piezoelectric stack.

An energy harvesting system is disclosed that is especially well-suited for use on aerodynamic systems such as guided projectiles or other aerobodies. A series of piezoelectric cantilevers are arranged to capture vibrations from the ambient environment and transduce the mechanical motion from the vibrations into useful electrical energy. The piezoelectric cantilevers can be arranged along different planes from one another to capture different vibrational modes and directions. A power conditioning circuit is included to receive the electrical energy produced by the piezoelectric cantilevers. A storage element coupled to the power conditioning circuit is configured to store charge based on the electrical energy produced by the plurality of piezoelectric cantilever structures. The stored charge can be used to provide low levels of power to certain electrical components on board the aerodynamic system before it has been launched.