797results about How to "High power transmission efficiency" patented technology

A remote device in accordance with the present invention includes an adaptive power receiver that receives wireless power from the wireless power supply by induction. The adaptive power receiver may be switched among two or more modes of operation, including, for example, a high-Q mode and a low-Q mode. By controlling the switching between modes, the amount of energy received by the adaptive receiver may be controlled. This control is a form of adaptive resonance control or Q control.

An underwater cable arrangement includes systems and method for distributing and / or transferring power and / or data to internal devices and external devices disposed along an underwater cable. Under water coupling systems and underwater electrical devices may be used in the distribution and / or transfer of the power and / or data.

A wireless power transmission apparatus includes at least one power transmission antenna for transmitting a wireless power signal in a magnetic resonance manner by using a resonant frequency having different bandwidths from each other; a wireless power signal generating module for generating the wireless power signal; at least one wireless power converting module for converting a power level of the wireless power signal generated by the wireless power signal generating module and having different power level conversion ranges corresponding to the bandwidth of the resonant frequency of the power transmission antenna; a multiplexer matching module for selectively connecting the wireless power converting module to a corresponding power transmission antenna; and a control unit for selectively connecting the power transmission antenna and the wireless power converting module according to a required power of a device to be charged to adjust the power level of the wireless power signal.

When supplying a power from a base station to a terminal station on radio and a distance from a base station to a terminal station is long, it becomes impossible for the terminal station to rectify the power. The feature of the present invention is found in a wireless communication system in which the peak value and duty ratio of a transmission power are controlled simultaneously, keeping the transmission power of a base station below a fixed value, thereby allowing a voltage to be applied to a diode, which is a component of a rectifier circuit possessed by a terminal station, always in excess of a threshold voltage of the diode, and energy is exchanged between the base station and the terminal station below a limit power.

Power is transmitted from a feeding coil L2 to a receiving coil L2 by magnetic resonance. A power circuit 200 turns ON / OFF switching transistors Q1 and Q2 to feed AC current to an exciting circuit 110, whereby the AC power is fed from an exciting coil L1 to a feeding coil L2. A phase detection circuit 150 sets the switching transistor Q2 of the power circuit 200 as a measurement target and detects the phase difference between source-drain current IDS2 and source-drain voltage VDS2 from the current phase and voltage phase thereof.

A wireless power system that may align a portable electronic device with an inductive wireless power supply. The induction coils used for transferring power wirelessly may be used as DC electromagnets to align the portable electronic device with the inductive wireless power supply. A DC current may be supplied to the primary coil and to the secondary coil to generate DC electromagnetic fields and attractive force between the primary and secondary coils. This attractive force may be used for alignment.

Provided are a magnetic field shield sheet for a wireless charger, which blocks an effect of an alternating-current magnetic field generated when a charger function for a portable mobile terminal device is implemented in a non-contact wireless manner on a main body of the portable mobile terminal device and exhibits excellent electric power transmission efficiency, a method of manufacturing the sheet, and a receiver for the wireless charger by using the sheet. The sheet includes: at least one layer thin magnetic sheet made of an amorphous ribbon separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin magnetic sheet via a first adhesive layer provided on one side of the protective film; and a double-sided tape that is adhered on the other surface of the thin magnetic sheet via a second adhesive layer provided on one side of the double-sided adhesive tape, wherein gaps among the plurality of fine pieces are filled by some parts of the first and second adhesive layers, to thereby isolate the plurality of fine pieces.

According to a first aspect, a secondary side of contactless power transmission apparatus includes: a holding member which is physically separated from a primary side; a magnetic layer; a shield layer for shielding electromagnetic noise; and a heat insulation layer. The secondary coil is a planar coil and supported by the holding member, and at least the magnetic layer is laminated on one side of the planar coil and unified with the planar coil. According to a second aspect, the secondary side of the apparatus includes a plurality of magnetic layers. Each permeability of the magnetic layers is different from each other, and each of the magnetic layers forms a magnetic path with the primary side.

An electrically insulated type of switching element drive circuit supplies an AC voltage via a transformer to a control electrode drive circuit that controls a switching element, with the frequency or amplitude of the AC voltage being modulated in accordance with required on / off operation of the switching element, and with the output AC voltage from the transformer being rectified to obtain a DC supply voltage that is continuously supplied to the control electrode drive circuit. The control electrode drive circuit detects a condition of the AC voltage and controls the switching element accordingly.

A receiving antenna of a wireless power receiving device wirelessly charging electric power according to an embodiment of the present invention includes a substrate, a soft magnetic layer stacked on the substrate, and a receiving coil configured to receive electromagnetic energy emitted from a wireless power transmission device, wound in parallel with a plane of the soft magnetic layer, and formed inside of the soft magnetic layer, and an insulating layer is formed between the soft magnetic layer and the receiving coil.

A harmonic drive according to the present invention comprises a plurality of internal gears; a band type of flexible gear provided with teeth engaged with each of the internal gears on its outer circumferential surface, the flexible gear having a pitch circumference length shorter than that of said internal gears; and a wave generating part disposed on an inner side of said flexible gear, the wave generating part generating a plurality of harmonic motions by deforming said flexible gear as the wave generating part rotates. Further, said flexible gear is formed integrally to engage with said plurality of internal gears so that the plurality of harmonic motions are overlapped, and one or more of said plurality of internal gears and said flexible gear are formed of profile shifted gears.

A wireless power transmitter for transmitting power to a wireless power receiver in a wireless scheme includes a transmitting coil configured to transmit power, which is supplied by a power source, to a receiving coil of the wireless power receiver using resonance; and a detecting unit configured to detect a coupling state between the transmitting coil and the receiving coil using an input impedance of the wireless power transmitter.

The invention relates to a non-contact electrical energy transmission device, particularly a non-contact charging device between an electrical energy emission device and an electrical energy receiving device, so as to realize the information exchange between the electrical energy emission device and the electrical energy reception device. The technical proposal is as follows: the electrical energy emission device and the electrical energy receiving device carry out the electrical energy transmission through coupling two air core coils. Additionally, the device utilizes the RFID technique to realize the information exchange between the electrical energy emission device and the electrical energy receiving device. On one hand, the electrical energy emission device performs the identification of the electrical energy receiving device, that is, the ID identification; on the other hand, the information exchange of the charging state between the electrical energy emission device and the electrical energy reception device is realized, thereby realizing the real-time monitoring of the charging process. Therefore, the non-contact electrical energy transmission device ensures the safe and controllable electrical energy transmission.

Disclosed is a humanoid robot capable of improving power transmission efficiency of a wire and movement displacement of a wrist joint by modifying the structure of the wrist joint serving as a passage for wires. The humanoid robot includes a robot hand including a power transmission device for transferring gripping force to finger members. The power transmission device includes connection members connecting an actuator to finger joints and guide members for guiding the connection members. The guide members include a first guide member coupled to a robot arm and a second guide member coupled to a hand body. The connection members are alternately wound around the first and second guide members. The gripping force is enhanced whereby a length of the connection members provided between the first and second guide members is constantly maintained even if the second guide member is shifted from the first guide member.

Power is fed from a feeding coil L2 to a receiving coil L3 by magnetic resonance. A VCO alternately turns ON / OFF switching transistors Q1 and Q2 at a drive frequency fo, whereby AC current is fed to the feeding coil L2, and then the AC current is fed from the feeding coil L2 to the receiving coil L3. A phase detection circuit detects a phase difference between the current phase and voltage phase, and the VCO adjusts the drive frequency fo such that the phase difference becomes zero. In a current phase detection circuit and a voltage phase detection circuit, detection values of the current and voltage phases can be changed, respectively and intentionally.

A wireless power feeding system includes a power feeding device and a power receiving device. The power feeding device includes a first resonance coil connected to a high-frequency power source through a first matching circuit, and a first control circuit connected to the first matching circuit and a first transmitter-receiver circuit. The power receiving device includes a second resonance coil configured to be in magnetic resonance with the first resonance coil, and a second control circuit connected to a load, a second matching circuit, and a second transmitter-receiver circuit.

Disclosed are a three-phase wireless power transfer (WPT) system and three-phase wireless rechargeable unmanned aerial vehicle (UAV) system based on the same. Three power receiving coils, including resonators, are installed at the ends of three landing leg of the UAV. A three-phase power converter installed in the UAV receives the three-phase AC induction current induced in three power receiving coils, including resonators, converting the three-phase AC induction current into a DC current to be charged in a battery. A three-phase power wireless charging apparatus wirelessly transfers three-phase power from three power transmitting coils to the three power receiving coils of the UAV when the three landing legs land on three coil seating units provided on a charging platform. A magnetic flux leakage shielding coil may be provided to prevent magnetic flux leakage from approaching the UAV. The power transfer efficiency is excellent, and electromagnetic interference can be also reduced.

A three-coil electromagnetic induction power transfer system is disclosed for epiretinal prostheses and other implants. A third, buffer coil is disposed between an external transmitting coil and a receiver coil buried within the body to improve efficiency and robustness to misalignments. One or more of the coils can be manufactured using micromechanical machining techniques to lay out conductors in a ribbon of biocompatible insulator, folding lengths of the insulated conductor traces longitudinally over one another, and then spiraling them into a ring. The traces change axial position in the ring by shifting across fold lines. One or more U-shaped sections on the traces can be folded so that adjacent traces can project opposite one another, lengthening the resulting ribbon that can be wound into a coil.

A power transfer system includes a power transmission device and a power reception device. A central conductor and a peripheral conductor are formed near the upper surface of a casing of the power transmission device. The peripheral conductor surrounds the central conductor in an insulated state from the central conductor. An alternating voltage generating circuit is provided for the power transmission device and applies an alternating voltage between the central conductor and the peripheral conductor. A central conductor and a peripheral conductor are formed near the lower surface of a casing of the power reception device. The peripheral conductor surrounds the central conductor in an insulated state from the central conductor. A load circuit is provided for the power reception device, and a voltage induced between the central conductor and the peripheral conductor is applied to the load circuit.

A hybrid drive apparatus is provided and enables efficient energy regeneration by the motor generator by separating the power transmission path through which the driving force from the engine is transmitted, from the power transmission path between the motor generator and the drive wheels, and also makes it possible to achieve a variety of driving modes while improving power transmission efficiency. In a hybrid drive apparatus (1) having an engine (10), a motor generator (20), and a planetary gear mechanism (30) in which the output shaft (21) of the motor generator (20) is coupled to a sun gear (S), the output shaft (11) of the engine (10) is coupled to a ring gear (R), and the input shaft (42) of a continuously variable transmission mechanism (40) is coupled to a carrier (C), the hybrid drive apparatus (1) includes a first clutch (C1) that can switch engagement / disengagement between the output shaft (11) of the engine 11 and the ring gear (R), a second clutch (C2) that can switch engagement / disengagement between the carrier (C) and the ring gear (R), and a third clutch (C3) that can switch engagement / disengagement on the input shaft (42) of the transmission mechanism (40).

The invention discloses a power supply transmission method of a high-power wireless induction type power supplier, relating to a power supply module and a power receiving module. A power supply microprocessor is electrically connected with a first driving circuit and a second driving circuit which are respectively provided with two or more than two groups of metal-oxide semi-field-effect transistor arrays connected in parallel; the first driving circuit and the second driving circuit are electrically connected with a power supply resonance circuit with a capacitance array; and the power supply resonance circuit is electrically connected with a power supply coil array, so that the electromagnetic wave energy can be outputted to the power receiving module through frequency conversion and driving power adjustment, and through a main resonance capacitor and a secondary resonance capacitor connected with the power receiving coil array in parallel, and a synchronous rectifier connected withthe main resonance capacitor electrically, the direct-current power is outputted to outside by a high-frequency filter capacitor, a first power supply switch, a low-frequency filter capacitor and a second power supply switch in a filter circuit in sequence. In the power supply transmission method, due to the design of low impedance of a power transmission loop, not only can the high-power wireless power transmission be realized, but also the output power can be adjusted according to the load condition.

An improved wireless transmission system for transferring power over a distance. The system includes a transmitter generating a magnetic field and a receiver for inducing a voltage in response to the magnetic field. In various respects, the receiver is configured to be implanted in a body. The receiver may include a housing enclosing a receiving coil and associated electronic components, a covering around at least a portion of the housing, and at least two wires wrapped around the housing to form a plurality of turns. The covering may be formed of a ferrite material configured to both magnetically shield a respective portion of the internal volume of the housing and redirect incoming magnetic flux from the transmitter to improve efficiency. Methods of use are also provided.

The plasma reactor of the invention is intended for treating the surfaces of objects such as semiconductor wafers and large display panels, or the like, with plasma. The main part of the plasma reactor is an array of RF antenna cells, which are deeply immersed into the interior of the working chamber. Each antenna cell has a ferromagnetic core with a heat conductor and a coil wound onto the core. The core and coil are sealed in the protective cap. Deep immersion of the antenna cells having the structure of the invention provides high efficiency of plasma excitation, while the arrangement of the plasma cells and possibility of their individual adjustment provide high uniformity of plasma distribution and possibility of adjusting plasma parameters, such as plasma density, in a wide range.

An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch phase conductors and a power controller of the type that uses gate-controlled switching thyristors for controlling power to the motor. KVAR capacitors connected between the power controller and the induction motor phase windings form a secondary low pass filter across the controller output terminals. The primary and secondary low pass filters isolate the power controller and induction motor with respect to spurious noise and harmonics generated by local as well as remote sources, and also improve real power transfer efficiency from the power generating source to the induction motor by transforming the effective impedance of the power source and the induction motor load.

Disclosed is an electric vehicle which receives power from a road surface by means of a wireless connection, in which an optimal configuration of a repeater (which is a resonator) and a receiving coil relative to the vehicle body is clarified. A first coil configuring the repeater forms a first wireless connection with a receiver coil, and a second coil forms a second wireless connection with a transmitting coil. The first coil is proximally arranged below the receiving coil and is aligned with the receiving coil, which is on the top side of a vehicle underbody panel; the second coil is arranged on the bottom side of the vehicle underbody panel. A performance indicator k*Q of the path from the transmitting coil below the road surface to the receiving coil of the electric vehicle is increased.

A first AC / DC converter circuit is coupled via two transformers to a second AC / DC converter circuit, the first AC / DC converter circuit having a symmetrical configuration of two switching elements performing complementary opened / closed switching, to alternately connect positive and negative terminals of a DC source to a junction between transformer primary windings. Each primary winding alternates between a condition of transferring electrical power to a secondary winding and a condition of serving as a choke coil which temporarily stores electromagnetic energy when a current flows through that primary winding and a primary winding of the other transformer.

According to a first aspect, a secondary side of contactless power transmission apparatus includes: a holding member which is physically separated from a primary side; a magnetic layer; a shield layer for shielding electromagnetic noise; and a heat insulation layer. The secondary coil is a planar coil and supported by the holding member, and at least the magnetic layer is laminated on one side of the planar coil and unified with the planar coil. According to a second aspect, the secondary side of the apparatus includes a plurality of magnetic layers. Each permeability of the magnetic layers is different from each other, and each of the magnetic layers forms a magnetic path with the primary side.

The invention belongs to the technical field of wireless electric energy transmission and provides an induction coil for wireless electric energy transmission, and aims at solving problems of large size and low transmission efficiency of an induction coil in the prior art. The induction coil comprises insulating films and conductor patterns. The conductor pattern on a same insulating film comprises a single turn or multiple turns. The conductor patterns on the insulating films are mutually overlapped in the stacked direction of the insulating films. The invention also provides a manufacture method of the induction coil for wireless electric energy transmission and a wireless charging system equipped with the induction coil. According to the induction coil, the multiple insulating films equipped with the single-turn or multi-turn conductor patterns are stacked, the conductor patterns are overlapped in the stacked direction, and magnetic fields generated by electrifying the conductor patterns are nearly overlapped. Therefore, the total magnetic field intensity is increased in direct proportion to the number of conductor pattern layers on the insulating films, and the converting efficiency between electric energy and magnetic energy is greatly improved.

Power is fed from a feeding coil L2 to a receiving coil L3 by magnetic resonance. A VCO alternately turns ON / OFF switching transistors Q1 and Q2 at a drive frequency fo, whereby AC current is fed to the feeding coil L2, and then the AC current is fed from the feeding coil L2 to the receiving coil L3. A phase detection circuit detects a phase difference between the current phase and voltage phase, and the VCO adjusts the drive frequency fo such that the phase difference becomes zero. In a current phase detection circuit and a voltage phase detection circuit, detection values of the current and voltage phases can be changed, respectively and intentionally.

A hybrid vehicle includes an engine, motors, and a power distribution and integration mechanism that are coaxially arranged with respect to each other. The hybrid vehicle also includes a transmission including a transmission differential rotation mechanism that is a single pinion planetary gear mechanism having a sun gear, a ring gear, and a carrier that is connected to a drive shaft, and that is configured such that these three elements can differentially rotate with each other; and a clutch capable of selectively coupling one of or both of the carrier and the sun gear of the power distribution and integration mechanism with the sun gear of the transmission differential rotation mechanism.