145results about How to "Improve power transfer efficiency" patented technology

A system and method for variable power transfer in an inductive charging or power system. In accordance with an embodiment the system comprises a pad or similar base unit that contains a primary, which creates an alternating magnetic field. A receiver comprises a means for receiving the energy from the alternating magnetic field from the pad and transferring it to a mobile device, battery, or other device. In accordance with various embodiments, additional features can be incorporated into the system to provide greater power transfer efficiency, and to allow the system to be easily modified for applications that have different power requirements. These include variations in the material used to manufacture the primary and / or the receiver coils; modified circuit designs to be used on the primary and / or receiver side; and additional circuits and components that perform specialized tasks, such as mobile device or battery identification, and automatic voltage or power-setting for different devices or batteries.

A wireless energy transfer system includes a primary and one (or more) secondary oscillators for transferring energy therebetween when resonating at the same frequency. The long range (up to and beyond 100 m) efficient (as high as and above 50%) energy transfer is achieved due to minimizing (or eliminating) losses in the system. Superconducting materials are used for all current carrying elements, dielectrics are either avoided altogether, or those are used with a low dissipation factor, and the system is operated at reduced frequencies (below 1 MHz). The oscillators are contoured as a compact flat coil formed from a superconducting wire material. The energy wavelengths exceed the coils diameter by several orders of magnitude. The reduction in radiative losses is enhanced by adding external dielectric-less electrical capacitance to each oscillator coil to reduce the operating frequency. The dielectric strength of the capacitor is increased by applying a magnetic cross-field to the capacitor to impede the electrons motion across an air gap defined between coaxial cylindrical electrodes.

A control apparatus for a vehicular drive system including a differential mechanism including an electric motor. The drive system includes a switching clutch and switching brake to switch the transmission mechanism between a continuously-variable shifting state and a step-variable shifting state. A shifting control mechanism changes a manner of controlling shifting action of the transmission mechanism during shifting action of an automatic transmission portion, for reducing a shifting shock, depending upon whether a differential portion is placed in the continuously-variable shifting state in which engine speed is variable due to differential function irrespective of rotating speed of power transmitting member, or the non-continuously-variable shifting state in which the engine speed is more difficult to be variable than in the continuously-variable shifting state.

A power transmitting device that contactlessly transmits electric power to a power receiving device having a secondary coil provided at a vehicle, and a power transfer system, are provided. The power transmitting device includes primary coils, a selecting unit and a control unit. The primary coils are arranged at an interval in an arrangement direction. The selecting unit selects one primary coil to which electric power is supplied from a power supply. The control unit controls the selecting unit by supplying the selected primary coil with a second electric power smaller than a first electric power, selecting a power transmitting coil from among the primary coils on the basis of at least one of a power transmitting situation of the selected primary coil and a power receiving situation of the secondary coil, and supplying the power transmitting coil with the first electric power.

The invention discloses an electric energy isolation transmission method and an isolation transmission device, which belong to the fields of electric energy isolation transmission and methods. The method is as follows: an isolation transmission circuit comprising a capacitor realizes the electric isolation between original auxiliary sides, suppresses leakage current between the original auxiliarysides and transmits power. The device comprises the isolation transmission circuit, wherein the isolation transmission circuit is mainly realized by the capacitor. The invention is applied to a powersupply, an adapter and a relevant product which have alternating-current or direct-current output and require lightness, thinness and high efficiency. The invention has small volume and is light, thin and practical; and meanwhile, the invention has high power transmission efficiency.

A control apparatus for a vehicular drive system including (a) a differential portion having a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member, a second electric motor disposed in a power transmitting path between the power transmitting member and a vehicle drive wheel, and a switching clutch and a switching brake provided in the differential mechanism and operable to limit a differential function of the differential portion, and (b) a step-variable automatic transmission portion constituting a part of the power transmitting path and operable to perform a clutch-to-clutch shifting action by a releasing action of a coupling device and an engaging action of another coupling device, the control apparatus including a step-variable shifting control configured to change an amount of racing of an input speed of the automatic transmission portion during the clutch-to-clutch shifting action, depending upon whether the differential function of the differential portion is limited by the switching clutch and brake.

A multimode power module system automatically selects one of multiple operating modes to maximize power transfer in varying conditions by using direct energy transfer, boost peak power tracking, buck peak power tracking, charge limit, and eclipse standby modes with reduced switching losses, reduced component count, and scalability through connections of multiple power modules system.

A control apparatus for a vehicular drive system including a differential mechanism operable to distribute an output of an engine to a first electric motor and a power transmitting member, and a second electric motor connected to the power transmitting member. The control apparatus, which permits size reduction of the vehicular drive system, or improvements of fuel economy and vehicle drivability, includes a switching clutch or switching brake for switching a the differential mechanism between a continuously-variable shifting state and a step-variable shifting state, to enable the drive system to have both of an advantage of a fuel economy improvement of a transmission the speed ratio of which is electrically variable, and an advantage of high power transmitting efficiency of a gear type power transmitting device. The control apparatus includes an engine-torque-variation restriction control operable in the continuously-variable shifting state of the differential mechanism, to control an electric path torque, for restricting a variation of the torque to be transmitted to the power transmitting member, irrespective of a variation of the engine torque, so that the engine torque variation to be transmitted to drive wheels is restricted to improve the vehicle drivability.

A transmission mechanism including a switching clutch or brake that is switchable between a continuously-variable shifting state and a step-variable shifting state, and has both an advantage of improved fuel economy provided by a transmission, the speed ratio of which is electrically variable, and an advantage of high power transmitting efficiency provided by a gear type power transmitting device constructed for mechanical transmission of power. While a clutch-to-clutch shifting action of an automatic transmission portion is in a tie-up state, a differential portion is placed in a continuously-variable shifting state by switching control, and engine speed is changed under the control of hybrid control, so as to prevent a drop of the engine speed for thereby reducing a shock of the shifting action, unlike in a non-continuously-variable shifting state of the differential portion in which the engine speed is directly influenced by the tie-up state.

A drive system of a hybrid vehicle, including an engine, a first electric motor, a second electric motor operatively connected to a drive wheel of the hybrid vehicle, and two planetary gear mechanisms, and wherein the two planetary gear mechanisms have at least four rotary elements arranged to permit the drive system to be placed in a selected one of a first operation mode in which the rotary element connected to the engine and the rotary element connected to the first electric motor are disposed on opposite sides of the rotary element connected to the drive wheel and the second electric motor, as seen in a collinear chart in which the four rotary elements are located at respective four different positions along a base line, and a second operation mode in which the rotary element connected to the first electric motor and the rotary element connected to the drive wheel and the second electric motor are disposed on opposite sides of the rotary element connected to the engine, as seen in said collinear chart.

The present invention discloses a hybrid DC converter. The hybrid DC converter is formed by connecting a high frequency resonant converter and a dual active bridge converter in parallel, the high frequency resonant converter and the dual active bridge converter are connected end to end orderly, and the high frequency resonant converter comprises a full-bridge inverter A, a high-frequency transformer and an uncontrolled rectifier bridge. The full-bridge inverter A and the uncontrolled rectifier bridge are connected with the head end and the tail end of the high-frequency transformer respectively, the dual active bridge DC converter comprises a full-bridge inverter B, a medium frequency transformer and a fully-controlled rectifier bridge, and the full-bridge inverter B and the fully-controlled rectifier bridge are connected with the head end and the tail end of the medium frequency transformer respectively. The hybrid DC converter of the present invention combines the advantages of the high frequency resonant converter and the dual active bridge DC converter and considers the current capability of a high frequency resonant capacitor, the high frequency resonant converter only realizes the effect of clamping a terminal voltage, and the large-power electric energy transmission completely depends on the dual active bridge DC converter, thereby guaranteeing the stable terminal voltage and the power transmission capability. The converter overall adopts a closed loop PI control strategy.

The invention discloses a terahertz wave detector based on an array patch antenna. The terahertz wave detector comprises an array antenna, a transmission line matching network and a field effect transistor. The array antenna is connected with the field effect transistor through utilization of the transmission line matching network. The array antenna is composed of four identical on-chip rectangular patch antennas and a feed network. The four patch antennas are set in an array form of 2x2. The four patch antennas are connected through utilization of the feed network. The transmission line matching network is a T-shaped impedance matching network composed of three segments of transmission lines. A source of the field effect transistor is connected with the transmission line matching network.A drain of the field effect transistor is taken as a signal output end. A gate of the field effect transistor is connected with a bias voltage source and an open quarter-wave transmission line. According to the terahertz wave detector, the problem that transmission power between the antenna and the field effect transistor is not high due to the fact that a terahertz wave receiving antenna is nothigh in gain can be effectively solved, and the effect that the terahertz wave detector is high in responsivity can be realized.