176results about How to "Wide power range" patented technology

An architecture, circuits, systems and a method for amplifying an analog signal. The architecture and/or circuit generally includes a first fixed stage (e.g., a predriver) and an adjustable stage. The first fixed stage may be configured to amplify an analog signal and provide a first amplified analog output at a first common node. The adjustable stage may comprise a plurality of independently selectable parallel amplifier segments. Each of the parallel segments may have an input at the first common node and an output at a second common node, a transistor having a control terminal, and a first inductor in electrical communication with the control terminal of the transistor. The adjustable stage may be configured to apply a bias to the control terminal of the transistor in a selected segment and to provide an output signal in one of a plurality of a power ranges corresponding to a number of selected parallel amplifier segments. The output signal generally has a minimum power efficiency when two or more of the parallel segments are selected. The present invention advantageously provides a relatively compact power amplifier with an extended output power range at which the amplifier is highly efficient. In preferred embodiments, the input and output matching characteristics are generally independent of the number of selected output amplifier segments.

A plasma processing apparatus includes a processing gas supplying unit for supplying a desired processing gas to a processing space between an upper electrode and a lower electrode which are disposed facing each other in an evacuable processing chamber. The plasma processing apparatus further includes a radio frequency (RF) power supply unit for applying an RF power to one of the lower and the upper electrode to generate plasma of the processing gas by RF discharge and an electrically conductive RF ground member which covers a periphery portion of the electrode to which the RF power is applied to receive RF power emitted outwardly in radial directions from the periphery portion of the electrode to which the RF power is applied and send the received RF power to a ground line.

The present invention provides a gas turbine combustor which makes it possible to achieve both a high combustion efficiency and low NOx emissions characteristics over a wide output power range without using a device that can vary the flow rate of the air used for combustion, by burning a lean mixture using high-temperature burned gas. The gas turbine combustor 10 comprises pre-mixture injection tubes 16 which conduct a mixture of fuel and air into a combustion chamber 11. The mixture from the pre-mixture injection tubes 16 is injected toward burned gas 19a present on the downstream side of the flame 19, which is injected from burners 15 that open into the combustion chamber 11, and this mixture is mixed with the burned gas 19a. Even in a mixture which is leaner than the lower limit of inflammability, the radicals in the burned gas 19a are effective in initiating reactions, so that the combustion of the mixture can be started. Since the burned gas has a lower oxygen concentration than fresh mixture, and since the pre-mixture is dispersed in space, the generation of NOx can be suppressed.

Precision and reliability of a current limited mode output power control of an RF amplifier is enhanced by sensing the base current of the current controlled output power transistor. The base current is compared to a control current that is normalized by scaling it as a function of the current gain of a bipolar junction transistor of similar characteristics as the output power transistor. Fabrication process spread of current gain figures of bipolar junction transistors is effectively compensated. Moreover, by using a band-gap temperature compensation control current that is eventually β-scaled before comparing it with the sensed base current of the output power transistor, the output power may be effectively controlled and maintained constant over temperature as well as process spread variations.

The invention discloses a fuel gas electronic injection valve used for a gas fuel engine. The fuel gas electronic injection valve comprises a shell, an electromagnetic valve component and a valve element component. The valve element component comprises a valve element, a valve block, a valve seat and an armature, wherein the valve block is installed in the valve element and fixedly connected with the lower end of the armature; when the electromagnetic valve component is powered on, under the effect of electromagnetic force, the armature pulls the valve block to upwards move so as to form a fuel gas channel between the lower surface of the valve block and the upper surface of the valve seat; and when the electromagnetic valve component is powered off, the lower surface of the valve block and the upper surface of the valve seat are attached to form a sealing face, and the fuel gas channel is blocked. The fuel gas electronic injection valve can be suitable for high-speed gas machines and dual-fuel engines, and the requirements of high response speed, accurate fuel gas metering, wide single cylinder power covering scope and the like are met.

The invention relates to an automatic cleaner with a cableless remote control floating power supply for a swimming pool, comprising a rechargeable floating power supply, an umbilical cable, an underwater automatic cleaner of the swimming pool and a remote controller. The rechargeable floating power supply floats on the water surface with the upper part exposing out of the water surface and receives signals sent by the remoter controller to control the underwater automatic cleaner to work; the underwater auto-cleaner uses a direct current (DC) motor, can automatically clean the swimming pool in accordance with a predetermined program and further performs the cleaning work in accordance with the signals sent by the remote controller. In the automatic cleaner with the cableless remote control floating power supply for the swimming pool, a longer power supply cable is cancelled, therefore, the automatic cleaner is not limited by length of the cable and can reach all places of the swimming pool to perform the cleaning work, and the defects of winding and locking cables, and the like are eliminated simultaneously.

The invention discloses a 12-cylinder water cooling diesel engine. The engine comprises a crank connecting rod mechanism arranged on a fixed part, a gas distribution mechanism, a transmission mechanism, a cooling system, a lubricating system, a fuel supply system, an intake/exhaust system, an electric system and a starting mechanism. The water cooling engine widens the power range, increases the power from traditional 195-499 kW to 780 kW, preferably exerts the characteristics of high power, small size, compact structure and low fuel consumption of the series of diesel engines, adapts to the market demands, satisfies the use requirements of users, is better in market competitiveness, can be applied to such fields as engineering machinery and generator sets, and widens the application field of 132-series engines.

In one embodiment, a method is provided fuel staging for a trapped vortex (TVC) combustion apparatus comprising an inlet premixer, for injecting fuel-air mixture into the inlet of the combustion apparatus and a vortex premixer, for injecting fuel-air mixture into the recirculating vortex. The combustion apparatus may be part of an engine, such as a gas turbine engine. The method comprises varying the relative proportion of mixture introduced through the inlet and vortex premixers as a function of load.

The invention relates to an energy management layered control method of a light-storage-combustion direct-current power supply system. The method comprises the steps of 1) carrying out the upper-layercontrol design of energy management: defining the energy EBus in a direct-current bus capacitor of the system as a smooth output variable, defining the direct-current bus voltage vBus as a state variable, defining a total load current reference track pHPSoref as a control variable, defining a nonlinear differential smoothing controller and a feedback control law to realize the stable control of the voltage of the direct-current bus, and obtaining a total load current reference track needed by the lower-layer control at the same time; 2) defining the lower-layer control for carrying out energymanagement: according to a simplified dynamic system formed by a super-capacitor, a storage battery and a fuel cell converter, constructing a prediction control model to realize the reasonable distribution of power among all power supplies. Compared with the prior art, the system has the advantages of layered control, wide stability margin, high degree of freedom, simple structure and the like.

A loudspeaker protection circuit comprises a rectification stage for receiving an input audio signal and producing a rectified output signal, a detection stage for passing the rectified output signal when the rectified output signal is greater than a predetermined level, a timing stage for receiving the rectified output signal from the detection stage and producing a time-varying charge signal, a regulation stage for producing a regulated output signal based on the input audio signal, an actuator stage for actuating a switch based on the time-varying charge signal and the regulated output signal, and an attenuation stage for attenuating an output audio signal when the switch is actuated.

The invention discloses a distributed feed source switch reluctance motor system for flexible charging of an electromobile. The system comprises a switch reluctance motor and two transducers T1 and T2, wherein the switch reluctance motor is provided with four phase stator windings L1, L2, L3 and L4; the middle part of each phase stator winding is tapped; the transducer T1 is used for exciting the stator winding L1 and the stator winding L2; the transducer T2 is used for exciting the stator winding L3 and the stator winding L4; the topology of the switch reluctance motor has the five working modes of a battery voltage-sharing mode, a direct current charging mode, an interaction charging mode, a direct current cascade charging mode and an alternating current charging mode. The system input of the switched reluctance motor can be a direct current power supply or an alternate current power supply; the system can normally operate under the different battery SOC conditions, can be applied to a plurality of occasions, and is wider in input and output voltage range and wider in input and output power range.

The invention discloses a stacked type permanent magnet speed controller. A magnetism transmission piece and a magnetism sensing component which are of a concave-convex multi-ring shell structure are arranged on a magnetic transmission device of a driving rotor shaft and a driven rotor shaft which are arranged on the stacked type permanent magnet speed controller respectively, a convex ring portion of the magnetism transmission piece and a convex ring portion of the magnetism sensing component are inserted into a concave ring portion of the magnetism transmission piece and a concave ring portion of the magnetism sensing component respectively, and air gaps are arranged between the convex ring circumference surface of the magnetism transmission piece and the convex ring circumference surface of the magnetism sensing component to separate the convex ring circumference surface of the magnetism transmission piece and the convex ring circumference surface of the magnetism sensing component. Magnetizers made of soft iron and at least two permanent magnets are arranged on the convex ring shell circumference surface of the magnetism transmission piece, the permanent magnets are isolated through soft iron, and the magnetic line of force of the permanent magnets is perpendicular to a rotor axis. The convex ring shell circumference surface of the magnetism sensing component is composed of soft iron materials and copper bars, wherein the copper bars are arranged on the soft iron and are evenly and fixedly arranged on the circumference surfaces of the soft iron, and the section of each copper bar is rectangular. The stacked type permanent magnet speed controller can transmit large torque, and has the advantages of being high in response speed, small in motion vibration and capable of controlling speed in a stepless mode.

The invention discloses a chaos control technique based bidirectional non-contact power supply system. The chaos control technique based bidirectional non-contact power supply system comprises a DC power supply U<H>, a full controlled bridge converter, non-contact transformers, a secondary-side converter, a filter circuit, a BOOST circuit, a charging switching device, a vehicle-mounted storage battery U<bat>, a primary-side controller and a secondary-side controller; in a positive transmission state, a mains supply acquires direct current through a power factor correction circuit, the vehicle-mounted storage battery is charged, and a solar cell also charges the vehicle-mounted storage battery; in a reverse transmission state, the solar cell supplies electric energy to a power supply side reversely, the cost is saved, and the volume and the weight are also reduced; in a positive power supply mode, a limit-cycle theory or a Poincare cross section is used for judging whether switching tubes S1 to S6 of the full controlled bridge converter work in soft switching states; in snow and rain days, a plug is not needed, and the safety performance is relatively high; and in a positive charging mode, three non-contact transformers are used, the power transmission range is larger, and the optimal state of the efficiency can exceed 94%.

The invention discloses an aviation high-voltage high-power three-phase full-control rectifying device based on silicon carbide. Master control system, three-phase alternating current filter circuit,pFC inductance circuit, the invention discloses a three-phase full-bridge silicon carbide power circuit. The system comprises an AC line voltage sampling conditioning circuit, an AC phase current sampling conditioning circuit, an SIC drive circuit, a DC filter circuit, a DC voltage collection circuit, a first isolation power supply, a second isolation power supply, a level conversion module, a communication module, a temperature collection circuit, a DC bus filtering shaping module and a DC bus voltage collection circuit. The technical problems that an existing product cannot continuously workat high temperature, losses are large, efficiency is low, the size and weight are large, and reliability is not high are solved.

A modular, lightweight, high-survivable, photovoltaic flexible blanket assembly for a space solar array is disclosed. The modular blanket is an accordion foldable or rollable flexible photovoltaic solar panel blanket assembly comprising a plurality of common photovoltaic modules spaced in an orthogonal pattern. Each module is mechanically attached with multiple low profile fasteners on their backside to an open weave mesh tensioned backplane structure. The backplane forms a tensioned dimensionally stable planar surface in the deployed configuration onto which the modules are suspended. Each module is common and comprised of a rectangular substrate that includes solar cell assemblies, circuitry, exposed electrical contacts for integration of blanket-level harnessing, and frontside and rearside shielding and coatings as required for the mission application. The blanket assembly may be dispersed with an open pattern of compliant and formable material on the backside to provide insulation against the vigorous vibration of the launch environment.

The invention discloses a heat performance test system, which can perform test experiment and performance estimation on the heat storage/release performance of a heat storage device with high power and a wide temperature range and the heat exchange performance of a large-sized heat exchanger. The system consists of a test and control system, a heat energy production and storage system, a pressurestabilizing system, a tested device assembly, a pump valve assembly and the like, and can implement a test under a relatively wide temperature and pressure range. The system can also simulate outputting of unstable heat energy such as regenerable energy and implement a performance test and an operation strategy research on a large-scale medium and high-temperature heat storage device array, and can meet work such as a research and development test on key components of a compressed air energy storage system.

In one embodiment, alternative combustion cavity layouts are provided for practicing fuel staging in a trapped vortex (TVC) combustion apparatus comprising an inlet premixer, for injecting fuel-air mixture into the inlet of the combustion apparatus and one or more vortex premixers, for injecting fuel-air mixture into the recirculating vortex within each of one or more trapped vortex cavities. A plurality of TVC cavities, may, for example, be laid out axially, radially, peripherally, internally, or in combinations of such arrangements. These layouts may be used in conjunction with a fuel staging method whereby the relative proportion of mixture introduced through the inlet and the respective vortex premixers can be varied as a function of operating conditions.

A premixer is provided for injecting premixed fuel-air mixture into the inlet of a combustion apparatus. In one embodiment, the premixer assembly comprises a plurality of concentric, aerodynamic injector rings, with radially-directed injection holes. The injection holes have a plurality of different diameters, facilitating good mixing over a broad power range. Due to configuration and hole sizes, the assembly is gas or liquid compatible. The radial, concentric injection formation allows for a short injection path.

The invention relates to a radiofrequency transmission system comprising: means of producing a complex digital signal quantised on N bits; means of transforming the complex digital signal into two complex digital signals with an identical and constant envelope that are phase-shifted with respect to one another; a digital processing pathway associated with each of the two complex digital signals with a constant envelope and comprising at least some filtering means of the sigma-delta type for quantising on M bits signals travelling in the processing pathway, M being less than N; digital-to-analogue conversion means for converting the outputs of the digital processing pathways into analogue signals; means of selectively filtering (of the bandpass type) the analogue signals in a predetermined transmission frequency band; means of amplifying the filtered analogue signals; and means of recombining the amplified analogue signals.

Provided is a reflective colorless optical transmitter receiving a carrier signal, which is a continuous wave, and outputting a modulated optical signal. The reflective colorless optical transmitter includes a semiconductor optical amplifier (SOA) amplifying an input optical signal allowing the input optical signal to have a gain, an optical modulator connected to the SOA and outputting a modulated optical signal, a high reflectivity facet reflecting the modulated optical signal from the optical modulator, and a Bragg reflection mirror connected to the high reflectivity facet, the optical modulator, and the SOA in series, wherein a Bragg resonator is formed by the Bragg reflecting mirror and the high reflectivity facet.

The invention discloses a fuel cell stack test board and a back pressure control method thereof. The test board comprises a hydrogen system and an air system. The hydrogen system is communicated witha hydrogen inlet of a fuel cell stack through an air inlet pipeline; the air system is communicated with an air inlet of the fuel cell stack through an air inlet pipeline; flow meters for detecting the flow of the air inlet pipelines are arranged on the air inlet pipelines; a hydrogen outlet and an air outlet of the fuel cell stack are respectively provided with an air outlet pipeline; first backpressure valves and second back pressure valves are arranged on the air outlet pipelines in parallel; the back pressure range of the first back pressure valve is smaller than that of the second back pressure valve; and pressure sensors used for detecting the pressure are arranged on pipeline sections between the air inlet pipeline or/and the air outlet pipeline and the first back pressure valve and between the air inlet pipeline or/and the air outlet pipeline and the second back pressure valve. According to the back pressure control method, double back pressure valves and two-way control are utilized, and back pressure control is rapidly achieved through different flow, higher-precision control is realized, and meanwhile, the coverage of a larger power range is realized, and the cost of the test board of a client is saved.

The invention discloses an electric control actuator for variable-geometry turbocharging. The electric control actuator for variable-geometry turbocharging comprises a bottom casing, a plastic cover plate, a DC motor, a worm gear and worm unit, an output shaft, a non-contact high-precision position sensor and an integrated processing circuit PCB, wherein the DC motor is fixed in the bottom casing through a spring press piece, and a pinion is mounted at the shaft tail end of the DC motor and meshed and connected with the worm gear and worm unit; a rotor of the non-contact inductive sensor is prepared from a stamping part conducting material made of a closed wire in specific geometry and is fixed at the top end of the output shaft through a positioning hole, and a helical gear is mounted in the middle of the output shaft and meshed with the worm gear and worm unit for actuation output; and the integrated processing circuit PCB is inlaid in the plastic cover plate. Motor control is driven by angle signals acquired by an engine ECU to change the flow sectional area (nozzle opening) of a turbine nozzle, a supercharger and an engine are matched optimally, and the electric control actuator has the advantages of high real-timeness, high control precision, large torque and the like.