108results about How to "Maximum output power" patented technology

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.

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 new VCSEL design is presented to achieve high output power and high brightness with a strong selection of a linear polarization state in high speed pulsing operation. Higher output power is achieved by including multiple gain segments in tandem, in the gain region. To achieve single mode operation with high output power, an extended cavity three reflector design is presented. High degree of polarization selectivity is achieved by a linear grating deployed with the third reflector, such that lasing is allowed only in a preferred linear polarization state. A polarization selective reflector including a linear grating is designed to impart strong polarization selectivity for a preferred linear polarization state. The polarization selective reflector used as the third reflector in an extended cavity VCSEL device, exhibits strong polarization selection for a preferred linear polarization state during high speed pulsing including in the gain switching resonance regime.

A Multi-Mode Multi-Band (MMMB) radio frequency (RF) power amplifier circuit operating at multiple frequency bands. The power amplifier circuit comprises a single wideband power amplifier having high output impedance which is configured to be equal to a load impedance of the load connected to the power amplifier circuit. A bias voltage applied to the wideband power amplifier is changed from a first value to a second value to provide a predetermined output power of the wideband power amplifier to the load with the output impedance of wideband power amplifier being equal to the load impedance. The power amplifier circuit also includes an individual harmonic filter for filtering each frequency band independently.

A single-mode fiber laser includes a single mode holding, large mode area optical fiber assembly having a large mode area core, a first cladding and a second cladding. The optical fiber assembly has several unique sections including a gain section having a ytterbium-doped core, first and second reflective sections including fiber Bragg gratings that define a lasing cavity, and an absorptive section also having a ytterbium-doped core, the absorptive section having an output end coupled to an input end of said first reflective section. A broad area, multi-mode diode pump source is configured to pump multi-mode light into a tapered input section and cladding-pump the gain section. The gain section absorbs the multi-mode pump light and emits single-mode light. The absorptive section absorbs emissions at the operating wavelength and prevents operating emissions from reflecting back into said pump source.

The invention provides a method for controlling low-voltage ride through of a cascaded photovoltaic grid-connected inverter. The method is based on two common mathematical models of grid-side voltage under the condition of an unbalanced grid fault, and the laws between the three-phase grid-side voltage amplitude and phase under different fault conditions are summarized. A method for controlling a cascaded photovoltaic grid-connected inverter under different fault conditions is derived based on the laws. By setting the on-off state of an H-bridge power device, a bypass power unit controls low-voltage ride through of a cascaded photovoltaic grid-connected inverter. When a bypass is generated, the optimal modulation ratio of a normal operation unit is recalculated, and a carrier phase shift module is adjusted to produce a new PWM pulse signal. The method can ensure that a photovoltaic grid-connected inverter outputs symmetrical three-phase current during grid-side voltage failure and enable the photovoltaic grid-connected inverter to run under unit power factor, and is of great significance to ensuring safe and stable operation of the power grid after large-scale photovoltaic power integration.

An electronically programmable multimode circuit is described. More particularly, the present invention is an electronically programmable multimode circuit that includes a first path and a second path wherein a mode and a signal directional flow direction is controlled through the selective biasing of the first path and the second path. A multimode circuit is produced that contains modes such as a phase shifter mode, an IQ modulation mode, an amplifier mode, a mixer mode, and a multiplier mode.

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.

The invention discloses a multi-target sliding mode control method for a proton exchange membrane fuel cell system. The method realizes system power tracking by using a current change rate as a control quantity for the first time. The efficient and safe operation of a fuel cell is ensured. The influence of the external load of the fuel cell, the cathode air flow, the anode hydrogen flow and the working temperature change of the galvanic pile on the output characteristics of the cell is comprehensively considered; and a multi-target sliding mode controller is designed to control the output power, the cathode air flow, the cathode and anode pressure difference and the stack temperature of the proton exchange membrane fuel cell system, so that the output power of the system is maximized whilethe tracking load demand power is ensured.

A design structure embodied in a machine readable storage medium for designing, manufacturing, and / or testing a design of a decision feedback equalizer (DFE) Clock-And-Data Recovery (CDR) architecture that utilizes / produces one sample-per-bit in the receiver and reduces bit-error-rate (BER) is provided. The design generally includes a receiver circuit. The receiver circuit generally includes a decision feedback equalizer (DFE) that produces one sample per bit, and means for automatically self-adjusting the DFE to enable an eye centering process by which peak energy is maintained within the receiver circuit when phase error is a minimum.

The invention relates to an antenna control method. The antenna control method is characterized in that the antenna control method is applied to intelligent equipment, a motion parameter of the intelligent equipment is acquired, in combination with the data information of a control terminal, the present position connection line of the intelligent equipment and the control terminal or an included angle of a main antenna energy distribution direction and an intelligent equipment motion direction is determined; according to the included angle, a transmission direction of antenna transmission data is determined; if the transmission direction of the antenna transmission data is not a target direction, the transmission direction is switched to the target direction. The method is advantaged in that on the condition that communication coverage of the intelligent equipment is not reduced, the quantity of antenna units forming an antenna array is reduced, self weight of the intelligent equipment is reduced, endurance of the intelligent equipment is enhanced, service life of the antenna units borne by the intelligent equipment is prolonged to a certain degree, and thereby service life of the intelligent equipment is prolonged.

A triboelectric power generator system uses a power converter to provide a controllable impedance between a triboelectric power generator and a load, in dependence on the triboelectric generator output. This enables improved power transfer even though the output generated by a triboelectric power generator can be irregular and fluctuates over time.

The invention discloses a composite wind energy collector. An electrode layer and a high-molecular polymer layer are arranged on both the upper surface and the lower surface of a T-shaped structural frame, the upper side and the lower side of the T-shaped structural frame are respectively provided with a piezoelectric cantilever beam, and the surface on the side, opposite to the T-shaped structural frame, of each piezoelectric cantilever beam is provided with a metal friction layer, so that two groups of composite wind energy collectors arranged in longitudinal symmetry are formed. The wind energy collectors combine piezoelectric wind energy collection modules and friction type wind energy collection modules. In work, wind blows to the wind energy collectors from the side surface, the wind power enables blades to swing and further drive the piezoelectric cantilever beams to swing up and down periodically, positive and negative charges in the piezoelectric cantilever beams are separated, and alternating currents are generated and output; and meanwhile, the metal friction layers and the high-molecular polymer layers are separated periodically, electron flowing is realized, and alternating current output is formed. According to the invention, the piezoelectric and friction wind energy collection modes are effectively combined, and the high power output of the wind energy collectors under a low wind speed is realized.

Disclosed are a receiver circuit, method and design architecture of a decision feedback equalizer (DFE) Clock-And-Data Recovery (CDR) architecture that utilizes / produces one sample-per-bit in the receiver and reduces bit-error-rate (BER). An integrating receiver is combined with a decision feedback equalizer along with the appropriate (CDR) loop phase detector to maintain a single sample per bit requirement. The incoming voltage is converted to a current and connected to a current summing node. Weighted currents determined by the values of previously detected bits and their respective feedback coefficients are also connected to this node. Additionally, the summed currents is integrated and converted to a voltage. A sampler is utilized to make a bit decision based on the resulting voltage. After sampling, the integrator is reset before analysis of the next bit. The necessary amplification is achieved by maximizing the sensitivity of the latch, using integration in front of the data latch.

A semiconductor laser includes a laser resonator (1) having a planar active region (3), a first (2) and a second (6) wave-guide layer that define the active region (3). The resonator (1) has a shape that is defined by a perimeter, along which the first layer (2) radiation guide has a plurality of cuts (4) forming a lattice. The cuts are made as at least two adjacent slits (4a, 4b) and a zone between the slits in which an uncut portion (5a) of wave-guiding layer is present. In the case of a circular semiconductor laser, the number of cuts (4) is a prime number, or an odd number that is a multiple of a prime number, the prime number being greater than or equal to five. This way, it is avoided that resonance modes evolve outside of the zone with the cuts, or in any case with a component that is different from zero of the wave vector in a radial direction, and a pure whispering gallery operating mode is obtained, with maximum of the emitted radiation that evolves in a vertical direction, i.e. orthogonal to the plane of the laser resonator, and without the laser emitting radiation evolving in a radial direction.

A handheld fluid powered spray device that is capable of receiving detachable accessories, that provides a power output source available to power detachable accessories, that has a compact arrangement, can be used in multiple positions during operation or non-operation and that evacuates the powering fluid efficiently to maximize and sustain output power of the device.

A power amplifier includes: a distortion compensating circuit that causes a bias circuit to have an output impedance so that a subsequent block bipolar transistor for signal amplification-use has a maximized saturated output power; and a distortion compensating circuit that causes a bias circuit to have an output impedance so that a distortion of an output power of the power amplifier 1 with respect to an input power is canceled by a distortion characteristic of an output power with respect to an input power of the subsequent block bipolar transistor for signal amplification-use which has a maximized saturated output power and a distortion characteristic of an output power with respect to an input power of the preceding block bipolar transistor for signal amplification-use. This makes it possible to provide a power amplifier that allows reduction in saturated output power brought by realization of a highly efficient low-distortion power amplifier.

The present invention relates to a thermostatic control method for a chip and an over-temperature protecting circuit thereof, belonging to the power integrated power management IC chip field. The method converts the dissipating power generated by output current of the chip into variation of the internal temperature of the chip through a thermal resistor. Afterwards, the variation of the temperature of the chip is converted into variation of a voltage signal. After the voltage signal is amplified, the output current of the chip is controlled so that the dissipating power of the chip is adjusted and the thermostatic control of the chip is realized. The over-temperature protecting circuit is a closed loop control system formed by a temperature detecting circuit, a constant temperature amplifier and a power-to-temperature converting module. The method quantizes the entire process of 'temperature variation' of the chip by the transmission function of a continuous time domain so as to design a temperature adjusting circuit based on the closed-loop control. The method and the circuit realize that the maximization of the output power is ensured on the premise that the chip has no overheat risk when the chip requires overheat protection.

The invention belongs to the field of photovoltaic power generation experimental devices and particularly relates to an experimental device and method for tracking photovoltaic maximum power based on an immune genetic algorithm. The experimental device comprises a solar cell panel, a storage battery, a controller, a power component, a load and a monitoring platform; a voltage sensor, a current sensor, a temperature sensor and a radiation quantity sensor transmit signals of voltage, current, temperature and radiation quantity of the solar cell panel to the monitoring platform, and the voltage, the current, power, the temperature and the radiation quantity of the solar cell panel are displayed through a computer on the monitoring platform; output ends of the voltage sensor and the current sensor are connected with the controller, and the controller figures out a maximum power point and the voltage through a self-adaption immune genetic algorithm, outputs a PWM signal to the power component, generates disturbance voltage by changing duty ratio of the PWM signal and controls the output of the solar cell panel to reach the maximum power point.

Disclosed are a receiver circuit, method and design architecture of a decision feedback equalizer (DFE) Clock-And-Data Recovery (CDR) architecture that utilizes / produces one sample-per-bit in the receiver and reduces bit-error-rate (BER). An integrating receiver is combined with a decision feedback equalizer along with the appropriate (CDR) loop phase detector to maintain a single sample per bit requirement. The incoming voltage is converted to a current and connected to a current summing node. Weighted currents determined by the values of previously detected bits and their respective feedback coefficients are also connected to this node. Additionally, the summed currents is integrated and converted to a voltage. A sampler is utilized to make a bit decision based on the resulting voltage. After sampling, the integrator is reset before analysis of the next bit. The necessary amplification is achieved by maximizing the sensitivity of the latch, using integration in front of the data latch.

The invention discloses a solar photovoltaic maximum power point tracking (MPPT) control system, which comprises a battery voltage sampling circuit, a diode D1, a current sampling circuit and a load voltage sampling circuit, wherein the battery voltage sampling circuit is connected between a positive electrode and a negative electrode of a solar photovoltaic battery; an anode of the diode D1 is connected with the positive electrode of the solar photovoltaic battery, and a cathode of the diode D1 is connected with a drain of a transistor; the current sampling circuit is connected with a source of the transistor; the load voltage sampling circuit is connected with a load in parallel; output ends of the battery voltage sampling circuit, the current sampling circuit and the load voltage sampling circuit are respectively connected with a controller; the controller outputs a pulse width modulation (PWM) signal to a gate of the transistor; a disturbance current is generated by changing the duty ratio of the PWM signal; and the output of the solar photovoltaic battery is controlled by controlling the disturbance direction to reach a maximum power point. By adoption of the solar photovoltaic MPPT control system, the phenomena of low tracking speed and swinging around a maximum operating voltage in the conventional MPPT technology are avoided, and the output power of the solar photovoltaic battery is maximized.

The invention relates to a type selecting method of a starter used for a turbofan engine. The method includes following steps: 10) selecting a starter as a preset starter; 20) dividing the revolving speed of a high-pressure rotor of the turbofan engine into a plurality of speed sections from zero to the idle speed, calculating unbalanced moments of two revolving speed nodes in each speed section, further calculating the average unbalanced moment and a starting time which are corresponding to each speed section, and adding the starting time of each speed section to obtain the starting time needed for the preset starter; and 30) comparing the starting time needed for the preset starter with a starting time range needed for the turbofan engine, wherein if the starting time needed for the preset starter is in the starting time range needed for the turbofan engine, starter type selecting is finished, and the maximum output power of the selected starter is outputted; and otherwise, a starter is selected again by combination of the maximum output power of the preset starter.

The invention relates to a thermal treatment applicator (19) for the deposition of thermal energy within tissue of a body (10) of a patient. The applicator (19), comprises: a plurality of RF antennae (20) for radiating a RF electromagnetic field toward the body (10);—a plurality of RF power amplifiers (21) supplying RF signals to the RF antennae (20), wherein each RF power amplifier (21) comprises a transistor and an output matching network (22) transforming the output impedance of the transistor into a low impedance value. Moreover, the invention relates to a MR imaging guided therapy system (1).

The invention discloses a resonant dual-power-supply aircraft electromagnetic transmission device. A high-power main circuit module comprises an alternating-current generator set, a direct-current onboard power supply, a power-conversion main circuit, a resonant main circuit and a transmitter circuit; the alternating-current generator set and the direct-current onboard power supply are in parallel connection with the power-conversion main circuit, the power-conversion main circuit converts onboard power supply direct current or generator set alternating current into high-frequency alternating current through a high-frequency inverter bridge or a controllable rectifier bridge-high-frequency inverter bridge, the high-frequency alternating current is converted into direct current through a high-frequency uncontrolled rectifier bridge, and the direct current is inverted into alternating-current square waves through half-bridge inverter; the power-conversion main circuit is connected with the resonant main circuit, and the resonant main circuit converts the alternating-current square waves into sine waves with a constant resonant frequency; and the resonant main circuit is connected with the transmitter circuit, and the transmitter circuit transmits required electromagnetic waves with a transmission frequency and a waveform. The resonant dual-power-supply aircraft electromagnetic transmission device reduces the capacity, hoisting weight and size of a hoisting alternating-current generator by utilizing a parallel power supply manner.

The invention relates to an inverting control system applicable to well sites of oil fields and used for photovoltaic power generation grid connection, and a work method. The inverting control system comprises a photovoltaic power generation device and an automatic equalization control inverter connected with a grid connection converter which is arranged in the photovoltaic power generation device. A three-phase output end of the automatic equalization control inverter is connected with a load of a well site of an oil field. The automatic equalization control inverter is suitable to convert switched-in power grid three-phase electricity into direct-current output voltage U0, and compares the direct-current output voltage U0 with direct-current output voltage U1 of the grid connection inverter to choose the output voltage with high voltage value to serve as input voltage of a three-phase inverter of the automatic equalization control inverter. The inverting control system achieves grid connection of output electricity of the photovoltaic power generation device and mains supply as well as automatic regulation and control through the automatic equalization control inverter, ensures that the three-phase inverter obtains the optimum input voltage, and accordingly improves the output power of the three-phase inverter.

The invention provides a multi-input multi-output power system for a rotary wing aircraft and a control method of the multi-input multi-output power system. The multi-input multi-output power system comprises a rotary wing, a propeller for providing forward flying power, a main power source for providing power for the propeller in a fixed wing flight mode phase of the rotary wing aircraft, an auxiliary power source for providing power for the rotary wing together with the main power source in a vertical take-off and landing phase of the rotary wing aircraft, a front transmission mechanism fromthe main power source to the propeller, and a main transmission mechanism from the main power source and the auxiliary power source to the rotary wing. According to the invention, a plurality of power sources, such as a fuel engine and a motor, are adopted; the power of the power sources is converged and split through a speed change device of the power system; the power is redistributed through different control strategies according to different flight phases of the rotary wing aircraft, so that a comprehensive power system with requirements of multi-input power converging and splitting and multi-output realized by control distribution is formed; and the power system not only can meet a high-power requirement of the rotary wing mode, but also can work in an optimal economic state in the fixed wing mode.

The invention discloses a novel dual-glass photovoltaic module. The novel dual-glass photovoltaic module comprises front glass, a front EVA adhesive film, solar cell pieces, a rear EVA adhesive film and rear glass, wherein a plurality of grooves are formed in a front surface of the rear glass, a bypass diode is arranged in each groove, the bypass diode is arranged on a non-solar cell piece region, a cable and a connector are arranged on a back surface of the rear glass, the solar cell pieces are connected in series to form a plurality of solar cell strings by using soldering strips, a plurality of convergence belts are arranged at an upper part and a lower part of the module and are used for connecting the solar cell strings, each bypass diode is connected in series and in parallel with a corresponding solar cell, and a positive electrode and a negative electrode of the bypass diode are respectively connected with a negative electrode and a positive electrode of the corresponding solar cell string. By forming the grooves in the rear glass, many bypass diodes are arranged in the module, optimal protection function is provided for the module, and maximum output power of the module is ensured; moreover, a junction box is omitted, and the module cost is reduced; and meanwhile, the reliability of the module can also be improved.

The invention provides a power supply control method for an off-network photovoltaic air-conditioning system. The off-network photovoltaic air-conditioning system comprises a photovoltaic array, a storage battery group and an air conditioner. The power supply control method comprises the following steps: judging working statuses of the photovoltaic array and the air conditioner; when the photovoltaic array is at a power supply state and the air conditioner is started, acquiring the output power of the photovoltaic array; judging whether the output power is matched with a required power for normal operation of the air conditioner; if the output power is not matched with the required power, controlling the photovoltaic array and the storage battery group to supply power to the air conditioner in parallel. According to the power supply control method for the off-network photovoltaic air-conditioning system, the utilization rate of the photovoltaic array can be increased; enough power can be supplied to the air conditioner under the condition of non-ideal illumination, further, the power level of the air conditioner cannot be reduced, and the air conditioner can be maintained to normally operate. The invention also provides the off-network photovoltaic air-conditioning system.