101results about How to "Efficient power transmission" patented technology

The present invention relates to a wireless power supply system including a remote device capable of both transmitting and receiving power wirelessly. The remote device includes a self-driven synchronous rectifier. The wireless power supply system may also include a wireless power supply configured to enter an OFF state in which no power, or substantially no power, is drawn, and to wake from the OFF state in response to receiving power from a remote device.

A device housing a battery 50 includes a receiving coil 51, and a charging pad 10 includes a transmitting coil 11 that magnetically couples with, and supplies charging power to the receiving coil 51. The device further includes a modulator circuit 61 that changes the impedance of the receiving coil according to internal battery 52 data. The charging pad further includes a detection circuit 17 that detects receiving coil impedance changes to detect the battery data. The modulator circuit 61 has a load circuit 62 that is connected in parallel with the receiving coil 51 and has a series-connected switching device 64 and impedance modulating capacitor 63, and a control circuit 65 that switches the load circuit 62 switching device 64 ON and OFF according to the battery data. The modulator circuit 61 switches the switching device 64 ON and OFF to transmit battery data to the charging pad 10.

A resonant, contactless, RF power coupling suitable for high power-density applications and for use in an ocean environment is disclosed. In the illustrative embodiment, the power coupling includes a transmit coupling and a receive coupling, each of which include a resonant element. A high-powered RF generator is coupled to the transmit coupling and a rectifier circuit is coupled to the output coupling. Each of the resonant elements is disposed in its own electrically-conductive canister and advantageously potted in an appropriate insulating dielectric. Each canister has an open end to facilitate inductive coupling between the two resonant elements. In order to exclude seawater from the interface between the canisters, a seal of compliant material is disposed therebetween.

A working vehicle transmission system comprises a PTO device for driving an external working device by power of a prime mover, and a multistage transmission for transmitting power from the prime mover to an axle. The multistage transmission includes a main speed-change mechanism and a sub speed-change mechanism. The main speed-change mechanism has plural drive trains for setting respective different speed stages. The sub speed-change mechanism is disposed downstream of the main speed-change mechanism and has plural drive trains for setting respective different speed stages. The main speed-change mechanism includes a first clutch and a second clutch. The main speed-change mechanism drive trains used for setting odd-numbered speed stages are activated by engaging the first clutch. On the other hand, the main speed-change mechanism drive trains used for setting even-numbered speed stages are activated by engaging the second clutch. During a speed-change operation of the main speed-change mechanism, an engagement action of one of the first and second clutches and a disengagement action of the other of the first and second clutches overlap each other. A reverser is disposed upstream of the first and second clutches of the main speed-change mechanism so as to enable switching the direction of output rotation transmitted to the first and second clutches from one direction to the opposite direction.

A system is provided for mitigating an electric unbalance of a three-phase current at a Point of Common Coupling being located between a wind farm having a plurality of wind turbines and a power grid. The system includes a measurement device and a central wind farm controller. The measurement device measures the electric unbalance at the Point of Common Coupling and provides a measurement signal being indicative for the measured electric unbalance. The central wind farm controller is coupled to the measurement device and controls the operation of the plurality of wind turbines. In response to the measurement signal the central wind farm provides a control signal for mitigating the electric unbalance at the Point of Common Coupling. Also provided is a corresponding method for mitigating an electric unbalance of a three-phase current and a computer program for controlling and/or for carrying out the mentioned method.

Provided is a power receiving device in which supply of power from a power supply device can be stopped while a reduction in Q-value is suppressed. The power receiving device includes a first antenna which forms resonant coupling with an antenna of the power supply device; a second antenna which forms electromagnetic induction coupling with the first antenna; a rectifier circuit including a plurality of switches and performing a first operation or a second operation depending on whether the plurality of switches is ON or OFF, the first operation being an operation in which voltage applied from the second antenna is rectified to be outputted, and the second operation being an operation in which a pair of power supply points is short-circuited; a load to which the voltage is applied; and a control circuit which generates a signal for selecting ON or OFF of the plurality of switches.

A wireless power feeder which performs power feed to a wireless power receiver having a power receive resonance circuit including a power receive coil and a power receive capacitor, this wireless power feeder including: a power feed coil; a resonance current detector; and a control circuit; wherein the power feed coil does not substantially constitute a resonance circuit; the current detector has a detection resonance circuit including a detection coil and a detection capacitor, and detects a resonance current of the power receive resonance circuit; the winding region of the detection coil in the current detector is smaller than the winding region of the power feed coil; and the detection coil in the current detector is disposed such that the central winding axis thereof forms an angle of not less than 80° and not more than 100° with respect to magnetic field vectors generated by the power feed coil.

An electric vehicle can include a power unit including a speed reduction device coupled to a motor output shaft. Two systems can be provided which are a drive-power transmission path to transmit rotation of a motor to a wheel hub, and a regenerative-power transmission path to transmit rotation of the hub to the motor. A drive-side one-way clutch is provided between the hub and a second internal gear being the final-stage gear in the drive-power transmission path and is configured to transmit rotation of the drive-side final-stage gear to the hub. A regeneration-side one-way clutch is provided between the hub and a regeneration-side first-stage gear and is configured to transmit rotation of the hub to the regeneration-side first-stage gear.

The invention discloses an electric vehicle advancing type wireless charging device and control method of the electric vehicle advancing type wireless charging device. The device comprises a rectifier, several magnetic coupling resonate emitting electrode groups, and a vehicle-mounted resonate receiving electrode, wherein every magnetic coupling resonate emitting electrode group comprises a first resonate emitting electrode and a second resonate emitting electrode. The vehicle-mounted resonate receiving electrode comprises a first receiving electrode and a second receiving electrode which are separately placed at front and back ends of an electric vehicle. The section of an emitting coil of the resonate circuit is in the shape of long strip and arranged crossly; the section of a receiving coil in the vehicle-mounted resonate receiving electrode is in the shape of long strip and vertically arranged. Two receiving electrodes are under the mutual complementary state, namely, when one receiving electrode is under the high-efficient emitting scale of the magnetic coupling resonate emitting electrode, the receiving electrode is worked under the resonate power transmission state; the other one receiving electrode is under the state of compensating the receiving electrode. Through reasonable design of the structure and the control strategy, the advancing continuous high-efficient wireless charging of the electric vehicle is realized.

An electric opening/closing device for vehicle, which has good layout characteristic of the vehicle and is provided with a highly-rigid attachment part, is provided. The vehicle electric opening/closing device comprises: a worm wheel meshed with a worm provided on a motor shaft of an electric motor; a planetary gear mechanism disposed coaxially with the worm wheel and decelerating rotation of the worm wheel to transmits it to an output gear; a gear case housing the worm wheel etc. and assembled to the electric motor; and a swing arm rotatably supported by the gear case between an output end linked to a back door and an input end linked to an output gear. An attachment plate for mounting the vehicle electric opening/closing device on the vehicle is sandwiched between the first case body and the second case body which constitute the gear case.

The invention relates to an internal spring type plug connector and an electric energy meter. The internal spring type plug connector comprises a plug connector body, which is sequentially composed of a plug unit, a limiting unit and a connecting unit, wherein the plug unit is an elastic expansion unit composed of a plurality of circumferentially arranged metal pieces with the front portions distributed at intervals and the root portions connected to the limiting unit; the front portion of the elastic expansion unit expands, the front end of the elastic expansion unit is folded inwards, and the inside of the elastic expansion unit is provided with a metal internal spring pieces for assisting the front portion of the elastic expansion unit to expand. The electric energy meter comprises the plug connector body, a meter support and an electric energy meter housing. The internal spring piece is made of alloy steel with excellent elastic performance, so that the elastic expansion unit can be free restriction of elasticity and can be made of metal with better conducting performance. Therefore, after the plug connector body is completely plugged into a plug hole of a wiring terminal, the elasticity of the front portion of the elastic expansion unit can be matched with that of the internal spring piece to ensure tight contact between the front portion of the elastic expansion unit and the inner wall of the plug hole of the wiring terminal, requirements on large plugging and high current can be met, and efficient power transmission can be achieved.

The invention relates to a shear wall structure configured with crossed slant internal prestress. The shear wall structure comprises a shear wall body, horizontal steel bars of the shear wall body and vertical steel bars of the shear wall body, wherein a shear wall tooth plate and a prestress tension end anchor tool are respectively arranged at the left upper corner and the right upper corner of the shear wall body, prestress anchoring end anchor tools are respectively arranged at the left lower corner and the right lower corner of the shear wall body, and a crossed slant prestress steel beam and a crossed slant prestress pipeline are arranged between the prestress anchoring end anchor tool and the prestress tension end anchor tool at the opposite corners. A construction method of the structure comprises steps of shear wall template erection and binding of ordinary steel beams of the wall body; crossed slant prestress pipeline arrangement and installation; prestress steel beam penetration and prestress anchor tool installation; shear wall concrete casting and maintenance; and prestress tension, pipeline grouting and end part anchor sealing. The shear wall structure greatly improves the anti-seismic performance of the shear wall.

A capacitive powering system(100) comprises a low power driver (111), a high power driver (112), a plurality of pairs of transmitter electrodes separated into a plurality of power sub-areas (210-1, 210-N) including at least a group of high power sub-areas (210-1, 210-M) connected to the high power driver and a group of low power sub-areas (210-M+1, 210-N) connected to the low power driver, and an insulating layer (130) having a first side and a second side opposite to each other, the pairs of plurality of transmitter electrodes are coupled to the first side of the insulating layer. The system is configured to forma capacitive impedance between the pairs of plurality of transmitter electrodes and a plurality of pairs of receiver electrodes (141, 144) placed in proximity to the second side of the insulating layer to wirelessly power each load connected to each of the pair of receiver electrodes.

A power transmission system, which has a plurality of DC power sources and a load that receives a supply of DC power, is characterized in that: a power priority retrieving device is attached to each DC power source; control is performed by a controller; and the amount of power to be delivered from a DC power source to which a power priority retrieving device is attached to the load is determined on the basis of the retrieved power priority.

The invention relates to a composite graphene optical fiber cable and a preparation method thereof. The composite graphene optical fiber cable comprises a silica fiber, a silica fiber cladding layer, a copper foil graphene film layer and a protection insulation layer. The preparation method is characterized by comprising the following steps of depositing and growing a layer of graphene thin film on a copper foil by a chemical vapor deposition (CVD) method to form the copper foil graphene film layer; coating a copper foil side of the copper foil graphene film layer with an adhesive layer; wrapping an outer layer of a fiber core of the silica fiber with the silica fiber cladding layer; winding the copper foil for growing the graphene thin film at the outer layer of the silica fiber to form a graphene optical fiber conductor; and coating the outer side of the graphene optical fiber conductor with the insulation protection layer to form the graphene optical fiber cable. The graphene has high conductivity, the electronic mobility of the graphene is more than 100 times of that of copper, a few electrons pass through the copper film layer, signal shielding is exerted on the optical fiber core, and the stability and low attenuation property of an optical signal are ensured; and the internal silica fiber is an optical signal transmission medium, the optical information signal is transmitted through the silica fiber, and the synchronous transmission of a power signal and the optical signal in the same graphene optical fiber cable is achieved.

The present invention discloses a booster (100) and a brake system. The booster includes a valve body (2) and a boosting assembly including a ball screw. The ball screw includes a screw rod (40), a nut (41) and a plurality of balls cooperating with and between the screw rod (40) and the nut (41). The nut (41) is linked with the valve body (2) and the nut (41) moves along a straight line on its cooperated screw rod (40) so as to drive the valve body (2) to move along a straight line. The brake system includes the booster (100) and a hydraulic system. The hydraulic system includes a braking main cylinder (11) having a piston (12), and the valve body (2) is connected to the piston (12). The booster can provide high transmission efficiency.

A wireless power transmission device includes a power-supplying coil configured to wirelessly transmit power to an electric vehicle (EV) serving as a vehicle, be installed in a slanted state or perpendicularly to a horizontal plane, and form an electromagnetic coupling circuit along with a power-receiving coil provided in the EV.

The present disclosure is to provide a power wireless transmitter in a magnetic resonance-based wireless power transmission system, wherein when, due to a presence of a metal, an output from the wireless power transmitter has a change in a resonance frequency thereof, a drive frequency and/or duty ratio with a maximum output therefrom are determined to be applied for a transmission from the wireless power transmitter, thereby to achieve an efficient wireless power transmission.