6777results about How to "Reduce power loss" patented technology

A magnetic nerve stimulator system is comprised of a core constructed from a material having a high field saturation with a coil winding. A thyrister capacitive discharge circuit pulses the device. A rapidly changing magnetic field is guided by the core, preferably vanadium permendur. For task specific excitation of various nerve groups, specially constructed cores allow for excitation of nerves at deeper levels with higher efficiency than is possible with air-core stimulators. Among the applications possible with this invention are treatment of incontinence, rehabilitation of large muscle groups in the leg and arm, and excitation of abdominal wall muscle groups to aid in weight loss and metabolic rate increase. A C-shape is employed for focussing the stimulation as desired.

An exemplary apparatus embodiment provides for controlling current supplied to solid state lighting, such as light emitting diodes. An exemplary apparatus comprises a memory adapted to store a plurality of current parameters; and a control circuit adapted to modulate an energizing cycle time period for providing a substantially constant DC average current to the solid state lighting in response to a selected current parameter of the plurality of current parameters. In an exemplary embodiment, the control circuit modulates a current provided to the solid state lighting in response to a predetermined minimum current level (IMIN) parameter and a predetermined peak current level (IP) parameter, such that the DC average current level (IO) is substantially proportional to one-half of a sum of a predetermined peak current level (“IP”) and a predetermined minimum current levelIM(IO∝IP+IMIN2).

A physiological sensor device for attachment to a mammalian subject comprising an output transmitter, at least two physiological sensors each for sensing one of the subject's physiological parameters, and a controller operably in communication with the physiological sensors which controller communicates a signal comprising data representative of both the sensed physiological parameters to the output transmitter which operably transmits the signal to a remote location, wherein the controller comprises a multiplexer which operably switches the data from both the physiological sensors into a serial output signal. In a preferred embodiment, respiration is detected by a bend sensor including an elongate member and an electrical component mounted thereon which electrical component has an electrical property which varies in dependence on the extent of bending of the elongate member. Other parameters such as temperature and full waveform ECG may also be measured.

A charging apparatus for electrically charging a capacitor storage type power source comprises a switching circuit for turning on / off the charge current, a current detection circuit for detecting the charge current, a voltage detection circuit for detecting the voltage of power source, a constant current control circuit for outputting an error amplifying signal according to the current value, a power control circuit for outputting an error amplifying signal according to the current value, the voltage value-and a power reference value, a constant voltage control circuit for outputting an error amplifying signal according to the voltage value and a voltage reference value, an OR circuit for selecting one of the error amplifying signals and a control circuit for generating a pulse width modulation signal according to the error amplifying signal output from the OR circuit to turn on / off the switching circuit and control the charge current.

A magnetic nerve stimulator system is comprised of a core constructed from a material having a high field saturation with a coil winding. A thyrister capacitive discharge circuit pulses the device. A rapidly changing magnetic field is guided by the core, preferably vanadium permendur. For task specific excitation of various nerve groups, specially constructed cores allow for excitation of nerves at deeper levels with higher efficiency than is possible with air-core stimulators. Among the applications possible with this invention are treatment of incontinence, rehabilitation of large muscle groups in the leg and arm, and excitation of abdominal wall muscle groups to aid in weight loss and metabolic rate increase. A C-shape is employed for focussing the stimulation as desired.

An actuator system for actuating a valve in a subsea environment comprises a valve spindle that is arranged to be coupled to an electric motor. To provide for power to the motor, at least one local electrical storage unit is provided. The system also includes a control unit comprising switching means for controlling the power to the motor. The control unit includes an intelligent processor and is arranged to receive signals from external sensors measuring a number of external and internal parameters, The actuator is preferable housed in a modular cage for easy replacement.

A method of activating a Multi-String inverter for photovoltaic generators (1a, 1b) of a photovoltaic plant (6), the Multi-String inverter incorporating on the input side a separate DC-DC converter (2a, 2b) for each generator string (photovoltaic generator) (1a, 1b) and each output of the DC-DC converters (2a, 2b) being connected in parallel and to an input of a DC-AC converter (3) and the DC-AC converter (3) being connected with an alternating current mains (4) for feeding into the mains aims at improving efficiency. This is achieved in that one or several electrical variables, namely input current, input voltage and / or input power are measured at each DC-DC converter (2a, 2b) and at least one of the DC-DC converters (2a, 2b) changing its operating condition as a function of this measurement when a limit value and / or a range is exceeded in such a manner that its power loss is reduced so that the energy yield of the photovoltaic plant (6) is increased.

Exemplary embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting has a first emitted spectrum at full intensity and at a selected temperature, with a first electrical biasing for the solid state lighting producing a first wavelength shift, and a second electrical biasing for the solid state lighting producing a second, opposing wavelength shift. Exemplary embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.

An inductive power transfer system includes a number of controllable reactive components (3, 6, 12, 13, 16) that allow the resonant frequency of a primary and / or secondary resonant circuit to be controllably varied to thereby control power available to a load (10).

A semiconductor device for high power application in which a novel semiconductor material having high mass productivity is provided. An oxide semiconductor film is formed, and then, first heat treatment is performed on the exposed oxide semiconductor film in order to reduce impurities such as moisture or hydrogen in the oxide semiconductor film. Next, in order to further reduce impurities such as moisture or hydrogen in the oxide semiconductor film, oxygen is added to the oxide semiconductor film by an ion implantation method, an ion doping method, or the like, and after that, second heat treatment is performed on the exposed oxide semiconductor film.

A ballast circuit for a high intensity discharge lamp includes a boost converter, responsive to a dc input voltage, for providing a boosted dc output voltage; a boost controller, responsive to the boosted dc output voltage, for driving the boost converter to maintain the boosted output voltage at a predetermined level; a buck converter, responsive to the boosted dc output voltage, for providing a reduced dc output voltage; and a buck controller, responsive to the reduced output voltage, for driving the buck converter to operate the discharge lamp in a transition mode and maintaining the reduced dc output voltage at a preselected level for operating the discharge lamp in a steady state mode.

Microscopic batteries, integratable or integrated with and integrated circuit, including a MEMS microcircuit, and methods of microfabrication of such microscopic batteries are disclosed.

The invention provides a method and a system for indicating an idle state of a channel or reserving resources, a method and a system for indicating an idle state of an uplink channel or reserving the resources, an LTE (Long Term Evolution) terminal, an LTE base station and an LTE system. The method for indicating the idle state of the channel comprises the following steps of setting a channel monitoring sub-frame used for detecting the state of the channel in a frame structure in a time division or frequency division duplex mode; if the channel monitoring sub-frame internally detects that the channel is in the idle state, sending an indication, representing that the channel is in the idle state, to the terminal through a channel idle state signaling or a resource reservation signaling, and sending an indication, representing that the channel is occupied by the base station, to communication equipment requesting to occupy a non-authorized frequency band. According to the technical scheme, the understandings of the idle state of the channel and the reservation state of the resources by the terminal and the base station working in the non-authorized frequency band are consistent, and data based on the same core network can be seamlessly switched and transmitted in an authorized frequency band and the non-authorized frequency band.

A microcavity OLED device including a substrate; a metallic bottom-electrode layer disposed over the substrate; a metallic top-electrode layer spaced from the metallic bottom-electrode layer; and an organic EL medium structure having a defined thickness, and including a light-emitting layer comprising a host material and at least one dopant disposed between the top-electrode layer and the bottom-electrode layer; wherein one of the metallic electrode layers is light transmissive and the other one is essentially opaque and reflective; wherein the material for reflective metallic electrode layer includes Ag, Au, Al, or alloys thereof, and the material for the light transmissive metallic electrode layer includes Ag, Au, or alloys thereof. The at least one dopant is selected to generate one of red, green, or blue light in the light-emitting layer. The defined thickness of the EL medium structure is selected so that the microcavity OLED device is tuned for emission of one of red, green, or blue light through the light transmissive electrode layer.

The patent teaches an installation suitable for expansive surface area photovoltaic modules. Installation structure comprises conducting rails functioning as a power conduits to convey power from expansive modules. Multiple modules may be mounted on the installation structure in a parallel or series arrangement. The high current carrying capacity rails minimize power loss in conveyance of power. Module installation and electrical connections are accomplished in a facile fashion using mechanical fasteners to thereby simplify and reduce installation cost associated with production of large photovoltaic generating facilities.

A semiconductor device including a schottky device and a trench type semiconductor switching device such as a MOSFET formed in a common die.

An object is to provide a moving object structure capable of reducing power loss caused when power is supplied from a power feeding device to a moving object by wireless communication. Another object is to provide a moving object structure capable of reducing the strength of a radio wave radiated to the surroundings. Before power is supplied to a moving object, a radio wave for alignment of antennas is output from a power feeding device. That is, radio waves are output from a power feeding device in two stages. In a first stage, a radio wave is output to align positions of antennas of the power feeding device and the moving object. In a second stage, a radio wave is output to supply power from the power feeding device to the moving object.

A flexible display device has one or more flexible electrode assemblies. Each of the electrode assemblies includes a hierarchical control arrangement for selectively activating electrodes of the display device. The hierarchical control arrangement includes high-level control elements and low-level control elements, each of the high-level control elements being operatively coupled to respective subsets of the low-level control elements, which in turn are coupled to respective groups of the electrodes. Exemplary control elements are microstructure elements containing imbedded microprocessors or integrated circuits. The use of a hierarchical control arrangement results in data signals having to pass through fewer control elements when compared with single-level arrangements. This increases operation speed and reduces power losses due to voltage drops across control elements. In addition, the number of connections to device(s) external to the display may thereby be reduced.

A wind power generation system having a group of wind turbine generators includes a superior controller having a generation power recording memory to record a sum of a generation power of the group of wind turbine generators and a charge and discharge power of a power storage system, a charge and discharge power command computing device for computing a charge and discharge power command for the power storage system in a second period by making use of information of the output power in a first period computed in the output power computing unit and information of a detection value at the present of the generation power recording memory, and a charge and discharge power control device.

An amplifying apparatus amplifies an input signal supplied to an input terminal and outputs an output signal from an output terminal. The apparatus includes a high-potential power supply line through which a high voltage is supplied; a low-potential power supply line through which a low voltage is supplied; a control unit; and a power supply in which one of the high and low voltages is a fixed voltage, and which generates, as the other of the high and low voltages, one of a first voltage in which a polarity of the fixed voltage is inverted, and a second voltage which is closer to the ground potential than the first voltage is. The control unit controls the power supply to cause the other of the high and low voltages to be switched between the first voltage and the second voltage in accordance with a signal level of the output signal.

There is provided a system, apparatus and methods for providing a laser beam to borehole surface in a predetermined and energy deposition profile. The predetermined energy deposition profiles may be uniform or tailored to specific downhole applications. Optic assemblies for obtaining these predetermined energy deposition profiles are further provided.

A plurality of single-phase synchronizing converter automatically synchronize on a peer-to-peer basis. Each synchronizing converter is configured as a DC-to-DC converter. The synchronizing converters operate in parallel as a multi-phase converter. A common bus between the synchronizing converters includes a sync line and a common phase control line. Proper phasing automatically occurs when power is applied, and the phasing changes automatically as converters are added or removed. When the system powers up, the converters arbitrate for phase position. The phasing positions are random, but the phasing is relatively symmetrical regardless of the number of phases. In one embodiment, a hot-swappable converter module can be plugged into any location of a parallel multiphase bus to produce a common output voltage. When an additional module is plugged in, the converters readjust their phases to maintain phase symmetry. In one embodiment, each module shares a substantially equal portion of the output load.

Short circuit failures and open circuit failures of light-emitting elements used for the backlight in an LCD panel can be reliably and easily detected. The voltage at the node between each series-connected light-emitting element array and a drive circuit is detected as a monitored voltage. A maximum detector detects the highest and a minimum detector detects the lowest of these monitored voltages. Short circuit or open circuit failure of a light-emitting element is detected by comparing the voltage difference between the maximum detector output and the minimum detector output with a specific reference voltage.

An envelope tracking power supply has a multiple-output DC / DC converter, a switch bank, an output voltage selector and an output filter. The DC / DC converter has an alternating current generating portion and a full rectifying portion. The alternating current generating portion, typically a LC circuit, can receive an input voltage and operate at zero voltage switching. The full rectifying portion includes at least one secondary winding and one voltage doubler output. Each voltage doubler has a first transistor, a second transistor, a first capacitor and a second capacitor. The transistors used as rectifier devices allow currents to flow bi-directionally and sink and source the currents from and to output capacitors to keep their voltage balance. Secondary windings and output capacitors are connected in series respectively. A switch bank selects a desired voltage from the series connected capacitors and connects it to the output filter. The switch bank receives an envelope tracking command from the voltage selector and provides a step voltage to the output. The output voltage is changed at switching speed to track a high bandwidth envelope signal.

A polymer-electrolyte-membrane fuel cell assembly comprising an ionomeric, conducting polymer membrane, an anode on a first face of the polymer membrane, a cathode on a second face of the polymer membrane, at least one of the anode and the cathode each comprising catalyst support material comprising conductive zeolite particulate material, and noble metal catalysts supported on the catalyst support material.

A matrix converter (38) converts three-phase AC power input from a first motor-generator (MG1) directly to three-phase AC power for driving a second motor-generator (MG2) and outputs the resultant three-phase AC power, without rectifying the three-phase AC power generated by the first motor-generator (MG1) once to DC power as in an example using a conventional three-phase full-wave rectification inverter. In a power supply system for a vehicle (14), the three-phase AC power is transmitted and received between two motor-generators (MG1, MG2) more directly, by means of the matrix converter (38). Therefore, power loss can be reduced, as compared with a conventional example in which the three-phase AC power is once converted to DC power. Thus, a power supply system for a vehicle with improved energy efficiency and a vehicle including the same can be provided.

The invention discloses a power control system of an excavator. The power control system is characterized by comprising a pressure sensor, a main pump displacement regulator, a revolution speed sensor and a loading calculation module, wherein the pressure sensor and the main pump displacement regulator are arranged on the outlet of a main pump, the revolution speed sensor is arranged on an engine, and the loading calculation module is arranged in the main controller; the pressure sensor, the revolution speed sensor and the main pump displacement regulator are respectively connected with the main controller and output engine revolution speed, throttle position and main pump displacement after being calculated by the loading calculation module to respectively control an actuating mechanism. The method is as follows: low load is a positive flow control mode; high load: a. when engine revolution speed is more than or equal to no-load speed* (1-7%), controlling by a constant power mode; and b. when the engine revolution speed is less than no-load speed* (1-7%), controlling by a limiting power mode. The invention controls by constant power comprehensive limiting power, gives consideration to the power output of a dynamic system on the premise of ensuring excavating force, dynamically adjusts the matching between the practical power of a hydraulic system and requirements, lowers power loss and reduces oil loss.

The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3-level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions.