40results about How to "Increase output power level" patented technology

Multi-engine aircraft power plants and associated operating methods are disclosed. An exemplary multi-engine power plant comprises a first turboshaft engine and a second turboshaft engine configured to drive a common load such as a rotary wing of an aircraft; and a heat exchanger in thermal communication with an exhaust gas of the first turboshaft engine and in thermal communication with pre-combustion air of the second turboshaft engine. The heat exchanger is configured to permit heat transfer from the exhaust gas of the first turboshaft engine to the pre-combustion air of the second turboshaft engine.

The invention relates to a default phase fault tolerance driving system of an open winding motor. A head end and a tail end of a common three-phase motor winding are cascaded with two nominal electrical level inverters; after a fault happens in a one-phase winding open circuit, two switches on a fault phase upper bridge arm are online locked; two switching tubes of a lower bridge arm are normally driven by 1; and through the modulation of phase current reconstruction and effective redundancy switch vector reconstruction, a stable torque output is retained, the default phase fault tolerance operation of the driving system is realized and the requirements on the system continuous operation capability of the high-reliability application field such as electric automobiles are satisfied. Through the design of dual power supply, the danger of a common-mode voltage and a zero-sequence current to electric components and motors is eliminated. The device comprises a primary direct-current voltage source (1), a primary capacitor (2), a primary inverter (3), a secondary direct-current voltage source (4), a secondary capacitor (5), a secondary inverter (6), a three-phase motor (7) and a redundant switch vector (8); the primary inverter is connected to the head end of the three-phase motor winding and the secondary inverter is connected to the tail end of the motor winding.

The invention discloses a multi-transmission-source enhanced wireless charging system. The multi-transmission-source enhanced wireless charging system comprises an energy transmission part, a relay part and an energy receiving part; the energy transmission part comprises a plurality of energy transmission sources; each energy transmission source comprises a high frequency inverter, a compensation capacitor and a primary coil with a small number of turns; the relay part is a loop which is formed by connecting a relay coil with a large number of turns with a relay circuit compensation capacitor in series; the relay coil is close to each primary coil; the energy receiving part comprises a secondary coil with a large number of turns and a rectifying and filtering circuit; an output end of the rectifying and filtering circuit is connected with two ends of a charging battery; an air gap exists between the secondary coil and the relay coil. The multi-transmission-source enhanced wireless charging system disclosed by the invention has the advantages that the output power grade of the system is enhanced, dissonance problem of the system caused by decoupling and mutual inductance between the plurality of transmission coils is avoided; neither additional compensation capacitor nor compensation transformer needs to be additionally arranged; as the energy transmission part and the relay part are mounted on the ground and the energy receiving part is mounted at the bottom of the vehicle, the system has a simple structure and has low requirements on space.

The invention discloses a staggered parallel flyback LED driving power supply and a PFM (pulse width modulation) control circuit thereof. A main circuit of the driving power supply is formed by staggering and parallel connection of two flyback converters, and comprises an alternating-current input end, an EMI (electromagnetic interference) filter, a bridge rectifier, the two parallel flyback converters, an output rectifier and an LED load. By the aid of the staggered parallel main circuit structure, current stress of switching tubes is reduced, input and output current ripple is reduced, the EMI filter design is simplified, power level of the driving power supply is increased, and the like. A PFM control method is adopted in the control circuit of the driving power supply; compared with a common PWM control method, the PFM control method has the advantages that by the aid of the PFM control circuit, the driving power supply can change in switching tube turning-on time and switching frequency simultaneously when the load changes, working loss during light load of the driving power supply is reduced, and power supply efficiency is improved. The driving power supply is suitable for applications of an LED driving power supply with an automatic dimming function.

A reader for, and a method of, electro-optically reading a symbol in a range of working distances include a housing, a data capture assembly supported by the housing for directing light at a variable power level at the symbol in a plurality of successive scans, and for detecting return light from the symbol, and a controller for controlling the data capture assembly by increasing the power level of the light during at least one of the successive scans to enable detection of the symbol located at an increased working distance from the reader, and by decreasing the power level of the light during at least another of the successive scans to maintain an output power level within safety limits. Preferably, the increased power level alternates with the decreased power level during successive scans.

The invention discloses an electric automobile wireless charging method and system based on a double transmission-double picking mode. The electric automobile wireless charging method based on the double transmission-double picking mode comprises the steps of inputting direct current voltage into two inverter circuits; enabling an output end of the first inverter circuit to load high frequency alternating current to a first primary side transmitting coil through a first primary side resonance circuit so as to generate a high frequency magnetic field; generating electric energy after sensing the high frequency magnetic field through a first secondary side picking coil; inputting the electric energy into a first buck-boost converter through a first secondary side resonance circuit and a first rectification filter circuit; enabling an output end of the second inverter circuit to load high frequency alternating current to a second primary side transmitting coil through a second primary side resonance circuit to generate a high frequency magnetic field; generating electric energy after sensing the high frequency magnetic field through a second secondary side picking coil; inputting theelectric energy into a second buck-boost converter through a second secondary side resonance circuit and a second rectification filter circuit; converting the electric energy into load electric energyby using the two buck-boost converters; and outputting the load electric energy to a series-connected load.

A printing device and method containing a carriage supporting print heads with a plurality of discharging elements to the image-wise forming of image dots of a marking substance on an a print medium, wherein the carriage is moveable in reciprocation in a main scanning direction and is also relatively displaceable with respect to the print medium in the sub scanning direction. Moreover, at least one radiation source is provided for irradiating the image dots of marking substance. The radiation source is designed such that the print medium with the dots formed thereon receives, in a traverse of the radiation source, a radiation dose which increases towards an edge of the dimension in the sub scanning direction of the area irradiated by the radiation source in the traverse.

This invention relates to one double coverage layer fiber side pump coupler grating, which comprises the following parts: inner package layer with one set of isosceles triangle level tanks with same structure parallel and tightly distributed with same length with LD array slow axis; the tank slope angle is more than sin-1n0/n2 with width H equal to lambada /n2sin2alpha. The method comprises the following steps: removing outer package layer; etching the inner package layer as process type; polishing the tank and coating the medium film to form inner coverage coupler grating.

The invention provides a high-power ASE light source with multi-section cascade 1064nm wave bands. The ASE light source comprises a source beam combiner, an optical isolator, an active doubly coated optical fibre, a cladding mode filter, a functional multi-mode optical fibre, a semiconductor pumping laser and the like. The ASE light source is characterized by comprising an n-section cascade structure, wherein the output power of the semiconductor pumping laser is divided into n parts according to certain proportion for respectively pumping N YDF (Ytterbium-doped Fibre) sections, so that pumping power at each level is rationally distributed and sufficiently utilized; the active beam combiner is adopted to simply the process, so that a complicated welding and re-coating process is avoided in the use of the traditional beam combiner; the functional multi-mode optical fibre is adopted to restrain the light reflection on the end surface of the optical fibre and to reduce the light damage effects on the end surface of the optical fibre. Besides, the adopted cladding mode fibre can effectively filter the pump light of a residual cladding, and prevent the residual cladding from breaking the effects. In a word, the high-power ASE light source can effectively restrain the generation of the laser, and can ensure the high-power ASE light output.

An undesirable constituent gas from the flue gas stream of a fossil fuel-fired power plant, especially carbon dioxide, CO₂, which is a potent greenhouse gas, is captured in a recirculating solvent-based absorption operation such as with an amine-based solvent. The solvent is exposed to flue gases for capture of the undesirable constituent, then heated to extract captured undesirable constituent for disposal, also regenerating the gas-rich solvent to gas-lean solvent for re-use. Absorption is continuous and uses the lean solvent at a rate proportional to the combustion rate. Solvent regeneration and its associated power loading are deferred and time-shifted to periods when the plant is operating below its peak power level. At high or peak power levels, rich solvent from absorption is accumulated in a storage vessel. At off-peak times, rich solvent accumulated in the storage vessel is regenerated together with rich solvent from concurrent absorption. Deferring regeneration to off peak (low price) times improves the peak (high price) output power level of which the plant is capable, and considerably increases revenue.

The invention relates to a full wave guide bandwidth standard wave output high power helical line traveling wave tube, which belongs to a field of microwave electric vacuum device. The high power helical line traveling wave tube includes a tube body, helical line arranged in the tube body, a holding bar, a flat wave guide and a microwave window, the flat wave guide and the helical line are connected by a helical line-ridge wave guide transition structure; the flat wave guide is connected with the microwave window by a flat wave guide-microwave window end joint wave guide transition section; and the microwave window is connected to a output end joint wave guide by a transition wave guide. The advantages of the invention are that output power level of the traveling wave tube is greatly increased in a standard wave guide bandwidth, and matching capability is good.

The invention discloses a mechanically coupled flywheel assisted composite energy storage system and a control method thereof. The system comprises a flywheel module and a compressed air energy storage module. The flywheel module is connected to a rotating disc through a continuously variable transmission when a clutch is closed, and the rotating disc achieves pre-synchronization with the flywheelspeed by motor acceleration. The rotating disc is connected to a reciprocating compressor, the reciprocating compressor is connected to the compressed air energy storage module, and the compressed air energy storage module compensates an intermittent power supply by connecting a generator. The flywheel energy storage and the compressed air energy storage adopt a mechanically coupled parallel structure. By collecting the flywheel speed, the clutch switch and the compressed air energy storage working state are determined, and the control strategy is simple and easy to operate and achieve.

An isolated type active clamping interlaced parallel connection AC-AC converter disclosed by the invention comprises two power switch tubes, two output diodes, two clamping diodes, one auxiliary power switch tube, one clamping capacitance, two switch capacitances, one output capacitance and two flyback transformers. The two flyback transformers respectively have two windings. The invention uses a second winding of two flyback transformers and two switch capacitances to realize improvement of the transformer output power grade. The leakage inductance energy of two flyback transformers are absorbed only using one auxiliary switch tube and one clamping capacitance, the zero voltage switch on and off of two power switch tubes and two auxiliary switch tubes are realized using the arrangement of shunt capacitances existing by the two power switch tubes selves and gates of two power switch tubes and two auxiliary switch tubes, soft switch off of the two output diodes and the two clamping diodes are realized by leakage inductances of the two flyback transformers, energy consumption elements are not existed in the circuit, thereby improving the output gain of the converter and the circuit efficiency.

The invention discloses a dual-wavelength pumping all-fiber 4.3[mu]m waveband carbon dioxide laser, which is characterized in that the output ends of two pumping sources are respectively welded with two sections of solid-core optical fibers, and the other ends of the two sections of solid-core optical fibers are respectively welded with two input arms of an optical fiber beam combiner; the input end of an anti-resonance hollow-core optical fiber is sealed in a sealed gas cavity, and the tapered output tail fiber of the optical fiber beam combiner is in coupling connection with the input end ofthe anti-resonance hollow-core optical fiber; the sealed gas cavity is connected with a vacuumizing and inflating system, and the vacuumizing and inflating system is used for vacuumizing the sealed gas cavity and inflating CO2 gas and buffer gas with certain air pressure into a fiber core of the anti-resonance hollow-core optical fiber; and the output end of the anti-resonance hollow-core opticalfiber is welded with an intermediate infrared crystal end cap. According to the invention, through the characteristic that stimulated radiation transition of CO2 gas molecules can be pumped by two pieces of laser with different wavelengths to generate laser radiation with the same wavelength, the dual-wavelength pumping optical fiber gas laser is realized, and the utilization rate of the gas molecules and the output power level of the system are increased.