451results about How to "Power maximization" patented technology

A method for communication over a wireless local area network (WLAN) includes receiving uplink signals from a plurality of stations in the WLAN. Responsively to the uplink signals, a set of the stations is selected for inclusion in a spatial multiplexing group. Downlink signals are transmitted simultaneously to the stations in the set using spatial division multiplexing (SDM).

A reflective impedance element is connected to a port of a composite right/left-handed transmission line, and operates at a predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes a pure imaginary number jB. A reflective impedance component is connected to a port of the composite right/left-handed transmission line, and operates at the predetermined operating frequency so that an impedance when the reflective impedance element is seen from the port becomes −jB.

A wireless communications system optimizes performance by dividing communications functionality between a wireless pacemaker and a wireless monitoring base station according to the design constraints imposed by the system elements. Typical design constraints include high frequency operation, low pacemaker power consumption, reasonable range, high data rate, minimal RF radiation of internal circuitry, small pacemaker antenna system, simple pacemaker RF circuit design, high reliability, low pacemaker cost, and use of existing pacemaker construction methodologies.

A photovoltaic panel with multiple photovoltaic sub-strings including serially-connected photovoltaic cells and having direct current (DC) outputs adapted for interconnection in parallel into a parallel-connected DC power source. A direct current (DC) power converter including input terminals and output terminals is adapted for coupling to the parallel-connected DC power source and for converting an input power received at the input terminals to an output power at the output terminals. The direct current (DC) power converter optionally has a control loop configured to set the input power received at the input terminals according to a previously determined criterion. The control loop may be adapted to receive a feedback signal from the input terminals for maximizing the input power. A bypass diode is typically connected in shunt across the input terminals of the converter. The bypass diode functions by passing current during a failure of any of the sub-strings and/or a partial shading of the sub-strings. The bypass diode may be a single bypass diode connected across the parallel-connected DC power source. The DC power converter may convert the input power at high current to the output power at a lower current. The output terminals may be connectible with wire cables to a load, and the DC power converter is configured to reduce energy loss through the wire cables to the load.

A photovoltaic system including a photovoltaic cell, and an electronic module connected to the photovoltaic cell. The electronic module is adapted to produce at least one control signal indicative of electrical power being generated by the photovoltaic cells. A tracking controller is adapted to receive the control signal(s) and based on the control signal(s), the controller is adapted to control a tracking motor for adjusting the system so that electrical power generated by the photovoltaic cells is increased. The photovoltaic system may include an optical element, adapted for concentrating solar light onto the photovoltaic cells. The electronic module preferably performs direct current (DC) to direct current (DC) power conversion and maximum power point tracking by electrical power, current, or voltage at either their inputs or their outputs. Alternatively, the tracking controller is configured to also perform maximum power point tracking by increasing to a local maximum electrical power by varying at least one of (i) current or voltage output from the photovoltaic cell or (ii) current or voltage output from the electronic module.

A method for maintaining reliability of a distributed power system including a power converter having input terminals and output terminals. Input power is received at the input terminals. The input power is converted to an output power at the output terminals. A temperature is measured in or in the environment of the power converter. A temperature signal is input responsive to the temperature. The power conversion is controlled by adjusting the input power based on the temperature signal. The power conversion of the input power to the output power may be controlled to maximize the input power by setting at the input terminals the input voltage or the input current according to predetermined criteria. One of the predetermined criteria is configured to reduce the input power based on the temperature signal responsive to the temperature. The adjustment of input power reduces the input voltage and/or input current thereby lowering the temperature of the power converter.

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 some embodiments, the transmitter can include a plurality of transmitter resonators configured to transmit wireless power to the receiver. The transmitter resonators can be disposed on a flexible substrate adapted to conform to a patient. In one embodiment, the polarities of magnetic flux received by the receiver can be measured and communicated to the transmitter, which can adjust polarities of the transmitter resonators to optimize power transfer. Methods of use are also provided.

An embodiment of the present invention provides an apparatus, comprising an RF matching network connected to at least one RF input port and at least one RF output port and including one or more voltage or current controlled variable reactive elements; and wherein the RF matching network is tuned to optimize the RF matching network and wherein said tuning is limited by a predetermined number of tuning steps that are taken within a transmit burst and/or limited by the magnitude of each step taken within a transmit burst and/or limited to the steps only being allowed between bursts.

A single phase power supply module for electric arc welders and plasma arc cutters comprising: a single phase input stage; positive and negative output terminals; a full wave rectifier connected to the input stage for rectifying the single phase voltage at the input stage; a buck converter type power factor correcting circuit for controlling current flow from the input stage to the rectifier, which buck converter has an output capacitor regulated to an intermediate voltage in the range of 100-150 volts; and, a high speed DC to DC converter having an internal transformer coupling applying voltage across the output terminals and means for regulating the applied voltage to an output voltage in the range of 0-113 volts. The module is universal and several can be connected in parallel, in series or to switch networks to construct several welders or cutters.

A free-space adaptive optical laser communication system having signal transmission and reception channels at all terminals in the communication system, wherein wavefront sensing (WFS) and wavefront correction mechanisms are employed along signal transmission and reception channels of all terminals in the communication system (i.e. adaptive optics) to improve the condition of the laser beam at the receiver (i.e. reduce the size of the spot a the detector plane). in the illustrative embodiment, the WFS mechanisms employ a novel WFS control process, in which active updating of reference positions and subaperture locations on the wavefront sensor. These WFS mechanism can be used in diverse application environments, including but not limited to FSO laser communication systems.

An electronic identification tag, usually in very small size, responds to a reader with an identification code unique to the object to which the tag is attached. The stand-alone device responds to a reader signal by storing energy received from the signal, then using the stored energy to generate another signal that is encoded with identification information. In operation, a reader generates RF energy which can reach a multiplicity of such tags over a distance of several meters. The system minimizes power requirements for the tag by minimizing intelligence in the IC. Use of a transmit frequency which is different from the reader's power frequency reduces interference between the power pulse and information pulse, eliminates the need for filters and enables the multiplied clock reference frequency as the transmit carrier frequency.

An embodiment of the present invention provides an apparatus, comprising an RF input port, an RF output port connected to the RF input port via a multichip adaptive impedance matching module (AIMM), and the multichip AIMM comprising one or more voltage or current controlled variable reactive elements, wherein the multichip AIMM is adapted to maximize RF power transferred from the at least one RF input port to the at least one RF output port by varying the bias voltage or bias current to the voltage or current controlled variable reactive elements to maximize the RF voltage at the at least one RF output port.

A powerline based communication system includes a powerline termination module, a plurality of powerline gateways, and a plurality of powerline nodes. The powerline termination module manages data for local area networks within the powerline based communication system. The plurality of powerline gateways is arranged in sets of powerline gateways, wherein each set of powerline gateways constitutes a local area network. Each of the plurality of powerline nodes is operably coupled to the powerline termination module via a high-speed communication path. In addition, each powerline node is operably coupled to set of powerline gateways, i.e., to a local area network, via powerlines of a local transformer. Each of the powerline nodes receives data for its respective LAN from the powerline termination module and provides the data to the powerline gateways of its LAN via the powerlines of the local transformer.

A modelocked linear fiber laser cavity with enhanced pulse-width control includes concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers. Apodized fiber Bragg gratings and integrated fiber polarizers are included in the cavity to assist in linearly polarizing the output of the cavity. Very short pulses with a large optical bandwidth are obtained by matching the dispersion value of the fiber Bragg grating to the inverse of the dispersion of the intra-cavity fiber.

The present invention provides a photovoltaic device having an active face, an active area on the active face and an operating wavelength range; and a cover element attached to the photovoltaic device and disposed over the active area of the active face of the photovoltaic element, the cover element having an opacity of at least about 25%. The present invention also provides photovoltaic systems, arrays, roofs and methods using such photovoltaic devices. In one embodiment of the invention, the photovoltaic device is a photovoltaic roofing element in which a photovoltaic element is integrated with a roofing substrate.

The invention provides Rf and more particularly microwave treatment devices for biological samples or tissue. In a preferred embodiment, the antenna are capable of directing energy to a particularly focussed area under the surface of the skin of a human. In other embodiments, the flexible antenna provides efficient delivery of energy to the sample or tissue regardless of the conformation of the antenna.

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 method and apparatus for a base station including an antenna array calculates a direction of a weight vector of a transmission beam to maximize in-phase component power for a common channel signal in a transmission channel signal for transmission to a mobile station and to minimize a sum of quadrature-phase power component and interference power for other mobile stations inside and outside a cell due to a transmission channel signal for the mobile station.

A preloaded cathode layer, comprising: (A) An integral porous structure having massive surfaces greater than 100 m²/g or pores with a size from 1.0 nm to 100 nm, wherein multiple conductive particles, platelets or filaments, without a conductive filler, form a 3-D conductive network; and (B) a metal polysulfide preloaded in the pores or deposited on the massive surfaces, selected from: (a) an M_xS_y, (x=1-3 and y=1-10) wherein M is a metal element selected from a non-lithium alkali metal, an alkaline metal selected from Mg or Ca, a transition metal, a metal from groups 13 to 17, or a combination thereof, or (b) Li₂S₆, Li₂S₇, Li₂S₈, Li₂S₉, or Li₂S₁₀, wherein the metal polysulfide contains a thin coating or small particles with a thickness or diameter less than 20 nm and occupies a weight fraction of from 1% to 99%.

The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two paths for conducting power to the load. One path, a line inductor path, may advantageously incur minimal power loss when the engine generator is supplying rated power to a load. A second path, a VSCF path, may be used to ensure that the frequency of the power is maintained at a substantially constant frequency under various load conditions. Another embodiment of the invention describes a process for determining optimal engine generator speed for a particular load. Because engine speed can be varied using any VSCF device, this process determines a speed that minimizes fuel consumption, emissions, and noise pollution for a given load.