980 results about "Maximum efficiency" patented technology

A device and method for spatially resolved photodetection and demodulation of temporally modulated electromagnetic waves makes it possible to measure phase, amplitude and offset of a temporally modulated, spatially coded radiation field. A micro-optical element (41) spatially averages a portion (30) of the scene and equally distributes the averaged intensity on two photo sites (51.1.51.2) close to each other. Adjacent to each of these photo sites (51.1) are two storage areas (54.1, 54.2) into which charge from the photo site can be moved quickly (with a speed of several MHz to several tens or even hundreds of MHz) and accumulated essentially free of noise. This is possible by employing the charge-coupled device (CCD) principle. The device combines a high optical fill factor, insensitivity to offset errors, high sensitivity even with little light, simultaneous data acquisition, small pixel size, and maximum efficiency in use of available signal photons for sinusoidal as well as pulsed radiation signals. The device and method may be used in a time-of-flight (TOF) range imaging system without moving parts, offering 2D or 3D range data.

An improved cartridge, typically in cylindrical or panel form that can be used in a dry or wet/dry vacuum cleaner. The cartridge is cleanable using a stream of service water, or by rapping on a solid object, or by using a compressed gas stream, but can provide exceptional filtering properties even for submicron particulate in the household or industrial environment. The cartridge has a combination of nanofiber filtration layer on a substrate. The nanofiber and substrate are engineered to obtain a maximum efficiency at reasonable pressure drop and permeability. The improved cartridge constitutes at least a substrate material and at least a layer including a non-woven, fine fiber separation layer.

A power conversion system includes a number of photovoltaic arrays, a number of inverters, a transformer, and processor. The processor is structured to control the number of inverters and operate the power conversion system to provide maximum efficiency of power conversion by the number of photovoltaic arrays, the number of inverters and the transformer, and to maximize power output from the number of photovoltaic arrays.

A method and apparatus for hands free inductive charging of batteries for an electric vehicle is characterized by the use of a transformer having a primary coil connected with a charging station and a secondary coil connected with a vehicle. More particularly, the when the vehicle is parked adjacent to the charging station, the primary coil is displaced via a self alignment mechanism to position the primary coil adjacent to the secondary coil to maximize the inductive transfer of charging current to the secondary coil. The self alignment mechanism preferably utilizes feedback signals from the secondary coil to automatically displace the primary coil in three directions to position the primary coil for maximum efficiency of the transformer.

A hearing compensation system for the hearing impaired comprises an input transducer for converting acoustical information at an input to electrical signals at an output, an output transducer for converting electrical signals at an input to acoustical information at an output, a plurality of bandpass filters, each bandpass filter having an input connected to the output of said input transducer, a plurality of AGC circuits, each individual AGC circuit associated with a different one of the bandpass filters and having an input connected to the output of its associated bandpass filter and an output connected to the input of the output transducer. The bandpass filters and AGC circuits may be divided into two processing channels, one for low frequencies and one for high frequencies and may drive separate audio transducers, one configured for maximum efficiency at low frequencies and one configured for maximum efficiency at high frequencies.

Disclosed is a power regulator for providing precisely regulated power to a microelectronic device such as a microprocessor. Improved power regulation is accomplished by optimizing the power efficiency of the power regulator. In particular, in a multiphase system, the number of active phases is increased or decreased to achieve optimum power efficiency. The multiphase voltage regulator adapts the operating mode to maximize efficiency as the load current demand of the load device changes by adjusting the number of active phases to maximize efficiency. The total value of current provided by the regulator and the total number of active phases is determined, the total number of active phases is compared with the number of active phases required to provide the total value of current at maximum efficiency; and the number of active phases is adjusted to provide the total value of current at maximum efficiency. A current sense circuit senses the current at each phase, a summing circuit coupled to the output of the current sense circuit provides the total current value of all the measured phases, a circuit coupled to the output of the summing circuit provides the time averaged total current value to a threshold detecting circuit that determines the number of phases at which the voltage regulator should be operating for maximum efficiency, and a circuit for comparing the number of phases that are operating to the number of phases at which the voltage regulator should be operating adjusts the number of active phases to the number of phases at which the voltage regulator should be operating for maximum efficiency.

A power factor corrected (pfc) ac-dc converter has a modified boost input and a modified buck output. Unlike the prior art boost input, the boost switch returns to the output, not to ground. Unlike the prior art buck output stage, a third switch connects to the input. This allows much of the input current to pass through the converter to the output. There is no input current measurement, but nearly ideal power factor correction is achieved through “natural modulation.” A preferred pfc ac-dc converter uses a variable dc-dc transformer on its output, as a post regulator, to provide dielectric isolation and to provide voltage level shifting. The output of the pfc ac-dc converter has the control characteristics of a buck converter, so it is a natural mate for the variable dc-dc transformer. An ac-dc buck converter is most efficient at its maximum duty cycle. It cannot regulate for a lower input voltage, but it can reduce its duty-cycle to control for higher input voltages. A variable dc-dc transformer is most efficient at its maximum ratio. It cannot regulate for a higher input voltage, but it can reduce its effective turns ratio to control for a lower input voltage. With a small overlap in their control ranges, both parts of the power system can operate at maximum efficiency. The variable dc-dc transformer controls the output voltage for nominal and low input voltage. The ac-dc buck converter limits over-voltage transients.

The invention discloses a photovoltaic power generator capable of obtaining electric power from a solar cell at the maximum efficiency all the time, even under an uneven sunshine condition. The photovoltaic power generator 10 includes: a plurality of solar cell bodies SC1, SC2, ... formed by connecting the solar cells in series or in series-parallel connection; and a plurality of charge transfer circuits T1, T2, ... which are set for each solar cell body one by one and whose input terminals are connected with the anode and cathode of each solar cell body and output terminals are connected with a loading side in parallel. Each charge transfer circuit comprises: a plurality of capacitors C2-C8 which cumulate the output of the solar cell bodies in a form of charges; a plurality of semiconductor switching member SW1a~, SW2a~, SW3a~, SW4a~, SW5a~, SW6, SW7; a tracking control member M1 for a maximal power of the solar cell bodies; and an output controlling member M2 for transferring the charges cumulated in the capacitors to the loading side, so as to enable the output voltage Vox to be tracked approximately equal to a terminal voltage Vo of the loading side.

A linear compressor and apparatus to control the linear compressor are provided which allows a frequency of a drive current supplied to a drive motor to synchronize with a resonance frequency varying according to a load fluctuation, in real time, thus obtaining a maximum efficiency of the linear compressor. The linear compressor includes a drive motor, a piston reciprocating by the drive motor and a control unit generating a reference current having a phase difference of 90° with respect to a displacement waveform of the piston and a frequency equal to the displacement waveform of the piston, and controls a drive current supplied to the drive motor to synchronize with a resonance frequency of the piston by synchronizing the drive current with the reference current.

According to the method longitudinal waves are generated in a transducer used only as a transmitter connected from outside to a conduit. These waves are transmitted along two diagonal paths through the streaming medium in an upstream and a downstream direction, and received by two transducers used only as receivers which are located in a diagonal upstream and downstream position and on an opposite side relative to the transducer used as a transmitter, also connected to the conduit. A transit time value of the waves between the transducer used as a transmitter and each of the transducers used as receivers is determined. A difference value on the basis of the determined transit time values is generated and the flow parameters are determined on the basis of said difference value. This measuring method is highly independent of the propagation velocity of the wave in the medium streaming in the conduit therefore also independent of the temperature and humidity of a gaseous medium. An apparatus and a conduit for use in the apparatus for performing the method is also suggested. The conduit used in the apparatus comprises a first location for receiving a transmitter in a middle region of the measuring area and two second locations for receiving receivers in a border region of the measuring area opposite to the first location. The wall of the conduit is dimensioned so that the longitudinal waves can pass through it with minimal loss and maximum efficiency. The inner wall of the conduit forms a uniform and continuos surface for the transmission of the longitudinal waves between the transmitter and the receivers and for blocking the passage of any organic or inorganic material. In medical applications the apparatus and its housing is configured to receive, hold and release a sterile conduit.

A method of optimizing performance of a wind turbine electric generator (WTG) comprises the steps of measuring the performance of a wind turbine electric generator, defining an area on a blade of the WTG, placing stall flags within said defined area, monitoring the behavior of the stall flags when the WTG is operating, determining a stall line based upon the stall flags during operation, installing vortex generators on the blade adjacent to and upwind of said stall line, monitoring the behavior of said stall flags during operation with vortex generators installed on all blades, and measuring the performance of the WTG to detect improved performance. If there is little or no improvement, repeating the steps on a second WTG using different placement within the defined area for the vortex generators.

A device to regulate current produced by a permanent magnet machine responsive to a plurality of phase current signals. The motor produces torque for application on a shaft. A processing and drive circuit responsive to a direct current command signal and a quadrature current command signal produces phase current signals for input to the motor. A command circuit responsive to the phase current signals, an angular position of said shaft, and a voltage input command signal to produce a direct current error signal and a quadrature current error signal. A control circuit responsive to the direct and quadrature current error signals produces the direct voltage signal command and the quadrature voltage signal command. The control circuit has a direct and quadrature proportional gain, integrator and clamp circuits. An algorithm produces limited or clamped voltage modulation index signals to obtain maximum efficiency and maximum torque per ampere in the speed range. The algorithm ensures that the current regulator does not run out of voltage by limiting the voltage vector to the achievable voltage vector range that provides maximum torque per ampere and maximum efficiency.

This invention discloses an apparatus and method for producing microcavitational activity in aqueous fluids for non-invasive macromolecule delivery into living cells. A standard electrohydraulic shock wave lithotripter is fitted with an adjustable ring reflector that shares the same foci as the standard lithotripter hemi-ellipsoidal reflector. A small portion of the spherical shock wave, generated by the spark discharge at the first focus (F1), is reflected and diffracted by the ring reflector, resulting in a weak preceding shock wave approximately 8.5 mus in front of the lithotripter shock wave reflected and diffracted by the hemi-ellipsoidal reflector. The peak negative pressure of the preceding weak shock wave or pulse at F2 can be adjusted from -0.96 to -1.91 MPa, using an output voltage of 25 kV. Living cells are exposed to the preceding shock wave and the lithotripter shock wave. With optimal pulse combination, the maximum efficiency of shock wave-induced cell membrane permeabilization can be enhanced substantially (up to 91%), by applying to the living cells a low dosage of, for example, 50 shocks. In addition, injury to mouse lymphoid cells is significantly increased at high dosage (up to 50% with shock number >100). The invention thus enables shock wave-inertial microbubble interaction to be used selectively to either enhance the efficiency of shock wave-mediated macromolecule delivery at low dosage or tissue destruction at high dosage.

A contactless, inductive charger having a generally planar surface is provided. An image, text or other visual indicator is disposed upon the substantially planar surface such that the visual indicator represents a preferred placement orientation for an electronic device for optimal inductive charging. The charger includes a primary coil positioned within the boundaries of the image, such that a user has a visual guide for placing the device on the charging surface for maximum efficiency in charging. The visual indicator, which may be a picture, outline, text or other directional indicator, may be geometrically similar to a shape of the electronic device or may be in the shape of a generic device. It may be disposed upon the charger by a method selected from the group consisting of painting, molding, silk screening, plating, vapor deposition and adhesive retention.

A digital core embodied within a semiconductor die is situated within any of a variety of integrated circuit packaging technologies including but not limited to Ball Grid Array or Quad Flat Pack surface mount technology. Said semiconductor die is of the variety that requires plural separate power supply voltage domains such as a digital core supply of differing voltage than the input/output pad ring supply voltage. Within the integrated circuit package including said semiconductor die also exists a high efficiency DC-to-DC voltage converter of type commonly known as a chopper or a switch mode power supply. In the preferred embodiment this switch mode power supply would be of the highest efficiency, a synchronous step-down regulator, thus to enable powering the entire integrated circuit from one supply voltage. The components contained within the integrated circuit package along with the semiconductor die include the majority if not the totality of the components comprising the switch mode power supply, which could include the power switching transistors; an inductor core and windings; the output voltage fixing circuitry; the output capacitor; and the substrate for mounting said components when integrated within a packaging technology that does not already include a substrate such as within the periphery of a lead frame for leaded devices.

A power supply unit composed so that outputs from a plurality of cells having different output characteristics are output from common terminals and so that a decrease in energy efficiency caused by connecting the cells is suppressed to the utmost is provided. After outputs of a plurality of cells 10a to 10c having different output voltages and output currents are adjusted to have the same output voltage value, the outputs are output to terminals 4 and 5 so as to match the parallel connection. Since the outputs of the cells are output in parallel, a cell outputting a low current does not restrict the output currents in the overall power supply unit, unlike the series connection. Moreover, since the outputs, which are adjusted to have the same voltage, are connected, problems such as flowback do not occur. In the case where the present invention is applied to a tandem solar cell, a light-absorbing wavelength characteristic can be assigned to each tandem photoelectric transducer so that solar light is utilized at the maximum efficiency, and the photoelectric energy conversion efficiency does not decrease even when the wavelength distribution of solar light deviates from the standard one.

This disclosure provides systems, methods and apparatus for increasing the efficiency of an amplifier when driven by a variable load. In one aspect a transmitter device is provided. The transmitter device includes a driver circuit characterized by an efficiency. The driver circuit is electrically connected to a transmit circuit characterized by an impedance. The transmitter device further includes a filter circuit electrically connected to the driver circuit and configured to modify the impedance to maintain the efficiency of the driver circuit at a level that is within 20% of a maximum efficiency of the driver circuit. The impedance is characterized by a complex impedance value that is within a range defined by a real first impedance value and a second real impedance value. A ratio of the first real impedance value to the second real impedance value is at least two to one.