98results about How to "Increase the maximum output power" patented technology

The invention discloses a radio-frequency power amplifier with a stack structure. The radio-frequency power amplifier comprises an input matching circuit, an output broadband matching circuit, a biasing circuit A, a biasing circuit B and a power amplification circuit, and the power amplification circuit is formed by stacking of at least two transistors with drains and sources connected. A radio-frequency signal source is connected with a grid electrode of the bottom transistor of the power amplification circuit through the input matching circuit, the biasing circuit B is connected with the grid electrode of the bottom transistor, and the source of the bottom transistor is grounded. The drain of the top transistor of the power amplification circuit is connected with a load through the output broadband matching circuit. Integral linearity, output voltage swing, operation bandwidth, power efficiency, power gain and maximum output power of the radio-frequency power amplifier are increased, and excellent second harmonic inhibition effects are achieved.

The invention discloses a photovoltaic array maximum power point tracking servo system comprising a clock circuit, a double-shaft mechanical tracking and locating system and a photovoltaic detecting device respectively connected with a singlechip control system. The double-shaft mechanical tracking and locating system comprises a first tracking component and a second tracking component connected with a battery panel bracket. A battery panel and the photovoltaic detecting device are provided on the battery panel bracket. The singlechip control system respectively controls and drives the first tracking component and the second tracking component to drive the battery panel and the photovoltaic detecting device to move in the vertical direction and the horizontal direction. The driving system adopted by the invention is a double-shaft active solar servo system which can realize the sun tracking under all weather conditions, has high precision, can always align the solar battery panel to the sun and maintain the maximum generating efficiency. Furthermore, the invention also discloses a control method of the system.

The invention discloses an ultrathin lithium-manganese polymer battery and a processing method thereof, belonging to the technology of lithium and manganese batteries. The technical scheme is that the ultrathin lithium-manganese polymer battery comprises an anode, a cathode, a diaphragm and an external packaging film. The anode consists of current collector aluminum foil, manganese dioxide, a conductive agent and a binder, the thickness of the anode is 0.03-0.2 mm, and the lead of the anode is formed in such a way that the extending part of the current collector aluminum foil outside the external packaging film is compounded with polypropylene or polyethylene. The cathode consists of a metal lithium sheet and a nickel strap or a copper strap or a steel strap, and the lead of the cathode is formed in such a way that the extending part of the nickel strap or the copper strap or the steel strap outside the external packaging film is compounded with polypropylene or polyethylene. The integral thickness of the battery is 0.3-0.5 mm. The processing method comprises the following steps of: (1) preparing the anode; (2) preparing the cathode; and (3) laminating and combining for molding. The invention solves the technical problem of great thickness of a traditional polymer battery, and has important significance for the generalization of various active identification cards.

The invention discloses a radio frequency power amplifier integrated on a same chip. The radio frequency power amplifier comprises two stages of amplifying circuits. An automatic biasing cascode CMOS amplifier is adopted in the first-stage amplifying circuit, and a SiGe HBT connected through a common emitter is adopted in the second-stage amplifying circuit. According to the radio frequency power amplifier, the withstand voltage, the isolation and the bandwidth of the circuits can be improved, the voltage swing and working current of the circuits can be improved, the gain and the maximum output power of the circuits can be improved, the frequency performance of the power amplifier can be improved, full-chip integration can be achieved, and accordingly, the integration degree is improved, cost is reduced, and the application is simplified.

The invention provides a TM-polarization GaAsP / GaInP active-region 808nm quantum-well laser. The laser structurally comprises a substrate, a buffer layer, a type-N lower limit layer, a lower waveguide layer, a quantum well layer, an upper waveguide layer, a type-P upper limit layer, and an ohmic contact layer sequentially from bottom to top. The upper waveguide layer and the lower waveguide layer are made of aluminum-free material GaInP. The quantum well layer is made of GaAsP material. The waveguide layer and the quantum well layer form a wide-waveguide aluminum-free active region. The laser has the advantages that the influence of Al oxidization, growth interface roughness and accessory electric field at cavity surface upon the reliability in high power output, long service life and the like of the laser can be reduced effectively, the waveguide layer and the limit layers are optimally designed into wide-waveguide asymmetric structures, and internal loss can be reduced effectively, and maximum output power and reliability can be improved.

The invention discloses a radio frequency power amplifier in a two-stage stack structure, comprising an input matching circuit, an output bandwidth matching circuit, and a two-stage amplifier circuit formed by cascading interstage matching circuits. A preceding stage of the two-stage amplifier circuit is a driving stage, and a following stage thereof is a power stage; a radio frequency signal source is connected with a gate electrode of a transistor in the bottommost layer of the driving stage through the input matching circuit, a drain electrode of a transistor in the uppermost layer of the driving stage is connected with one end of the corresponding interstage matching circuit, the other end of this interstage matching circuit is connected with a gate electrode of a transistor in the bottommost layer of the power stage, and a drain electrode of a transistor in the uppermost layer of the power stage is connected with a load through the output bandwidth matching circuit. This circuit enables improvements in the voltage withstand capacity, output voltage swing, operation bandwidth, power efficiency, power gain and maximum output power of the power amplifier and provides better harmonic suppression effect.

The invention discloses a radio frequency power amplifier with high linearity and high efficiency. The radio frequency power amplifier with high linearity and high efficiency comprises five capacitors: C1, C2, C3, C4 and C5, four resistances: R1, R2, R3 and R4, four N-channel metal oxide semiconductor (NMOS) pipes: M1, M2, M3 and M4 and two inductances: L1 and L2. Input radio frequency signals (Rfin) are respectively input to grids of the M1, M2 and M4 NMOS pipes through the C1, C2 and C3 capacitors, Vb1, Vb2, Vb3 and Vb4 bias voltages respectively provide direct current to the M1, M2, M3 and M4 NMOS pipes through the R1, R2, R3 and R4 resistances, drain electrode of the M2 NMOS pipe is connected with source electrode of the M4 NMOS pipe, and drain electrode of the M1 NMOS pipe is connected with source electrode of the M3 NMOS pipe. The radio frequency power amplifier with high linearity and high efficiency enhances puncture-resisting performance of a transistor, improves output power, and achieves high linearity and high efficiency of the power amplifier.

The invention discloses a high-power semiconductor laser with non-absorbing windows, wherein the non-absorbing windows are positioned above a ridge-shaped or bar-shaped part of the laser and distributed at two ends of a laser cavity surface and distributed in a semicolumnar shape, the planar part of each non-absorbing window is a light emergent cavity surface of the laser, and the arc-surface part of each non-absorbing window is positioned inside the cavity length of the laser; the depth of each non-absorbing window should exceed that of an upper waveguide layer of an active area of the laser; in the ridge-shaped waveguide structure, the diameter of the non-absorbing window is larger than or equal to 1 micrometer and smaller than 20 micrometers; or in the bar-shaped laser structure, the diameter of each non-absorbing window is larger than 3 micrometers and smaller than 900 micrometers. According to the high-power semiconductor laser, the optical catastrophe damage threshold is greatly increased, the light absorption caused by impurity level is effectively reduced, and the maximum output power of the laser is promoted; and the high-power semiconductor laser is simple in process and feasible and has a large-scale production feature.

The invention discloses a method for increasing that maximum output power of an IPM motor control of an electric vehicle. A motor controller of the present invention uses a current command obtaining module, A proportional-integral control, a voltage vector limiting algorithm module, a coordinate inverse conversion module, a vector control overmodulation module and a three-phase inverter drive motor, wherein output signals of that three-phase inverter are fed back to the proportional-integral controller through a coordinate conversion module, and position and speed signals of the motor are measured and fed back through a position and speed measurement module; The current command obtaining module gives current commands of d and q axes of the motor according to three regions. The voltage vector limiting algorithm module judges the working condition of the motor and gives the voltage limiting amplitude of d and q axes of the motor. Vector-controlled overmodulation module modulates voltageaccording to region and defines pulse width modulation ratio. The dynamic model of the motor is established to optimize the d, q axis current output quality of the motor. The method improves the maximum output power, realizes the stable control of the current, good dynamic response of the current following and steady-state performance.

The invention relates to a hydrogen-doped inlet air and oxygen-enriched gasoline engine with EGR and a combustion control method. The device mainly comprises a gasoline engine, an EGR cooler, an EGR valve, a water electrolysis device, a hydrogen storage, an oxygen storage, a pressure control device, a hydrogen injection device and an oxygen injection device. According to the hydrogen-doped inlet air and oxygen-enriched gasoline engine, in-cylinder combustion modes of four air inlet modes including inlet air doped with hydrogen and oxygen, small-scale exhaust gas recirculation and hydrogen doping, large-scale exhaust gas recirculation and hydrogen doping and oxygen enrichment are respectively adopted in a cold start and idling condition, a medium or small load condition, a large load condition and a full load condition of the engine, so that the effects that the thermal efficiency is obviously improved and the HC and CO discharge is reduced at the cold start and idling stage of the gasoline engine can be achieved; the pumping loss of the engine is greatly reduced in the medium or small load condition, and the oil consumption and NOx discharge are greatly reduced; the engine power is obviously increased within short time when a throttle valve is fully opened. The hydrogen-doped inlet air and oxygen-enriched gasoline engine has excellent overall properties such as low emission, low oil consumption and instantaneous high power output.

The invention relates to a method for optimizing peak-valley ratio and relative device. Wherein, said method comprises: recognizing the type of transmitted signal, to generate relative peak counteract impulse; layering said peak counteract impulse and the transmitted signal to be output. The invention can improve the maximum sending power and efficiency of sending device and improve the low-level modulation, etc. The invention improves the cover range in low-level modulation method. And it can be used in time division communication system.

The invention relates to a method of a high power ytterbium doped fiber laser of a neodymium-doped fiber laser pump. The method uses semiconductor laser pump neodymium-doped fibers with centre wavelength of about 808nm (+-10nm) to output fiber lasers with centre wavelength of 920-960nm, and optical fiber laser pumping ytterbium doped fiber produced by a neodymium-doped fiber laser is used for producing optical fiber lasers with centre wavelength of about 1070nm. The method greatly improves luminance of a pumping source, promotes maximum power output of the optical fiber laser in magnitude, has no requirements for doped fibers, simplifies system design and lowers system cost.

The invention discloses a biofuel cell capable of directly oxidizing glucose and a preparation method of the biofuel cell. The biofuel cell comprises an anode chamber, a cathode chamber, a membrane for separating the anode chamber and the cathode chamber, and an outer circuit for connecting an anode in the anode chamber and a cathode in the cathode chamber; fuel in the anode chamber is the glucose; fuel in the cathode chamber is oxygen; the anode and the cathode are nickel net or copper net electrodes loaded with nano silver particles. The preparation method comprises the following steps of preparing an electrode, preparing electrolyte, assembling the biofuel cell and the like. The biofuel cell capable of directly oxidizing the glucose, provided by the invention, takes the nickel net or copper net electrodes loaded with the nano silver particles as the anode and the cathode, so that the power density of the cell is effectively improved, and the stability of the biofuel cell under different temprature conditions and different loading conditions is also guaranteed; the preparation method of the biofuel cell is relatively simple and easy, low in cost and is convenient to popularize and apply.

The invention actively explores the technical process suitable for half-cell piece production through conducting effective design and innovation on the basis of the existing process and utilizing the existing equipment, and discloses a manufacturing method of half-cell pieces. The manufacturing method has the advantages of low fund investment, simple technical process and easy operation, the produced half-cell pieces are more unified and standardized, the mechanical strength and machinability of the half-cell pieces are improved, the defects are reduced, the packaging power loss of the half-cell piece module is reduced, the maximum output power is increased, the rate of finished products is improved, and the manufacturing method is suitable for large-scale industrial production.

The invention discloses a glucoamylase and nanogold co-doped carbon nanomaterial hybrid anode-based starch biofuel cell. Through combination of efficient hydrolysis of GA on starch and efficient electrochemical catalytic oxidation of electrochemically deposited AuNPs on glucose, the starch biofuel cell based on a hybrid anode which is co-modified by direct electrochemical deposition of the AuNPs and crosslinking of the GA and a carbon nanomaterial is successfully prepared. The assembled fuel cell has the maximal output power which can reach 91.4[mu]W / cm<2>, and excellent operation and storage stability. Furthermore, the strategy for constructing a cascade reaction anode by enzyme and precious metal in a hybrid way for working can be taken as a common method, and can be developed and applied to research of various polysaccharide fuel cells comprising the glucose oxidation process in future.

A passively Q-switched fiber laser system comprises a pump source and an ring cavity connected with each other. The ring cavity comprises a gain fiber, a directional coupler and a saturable absorber connected in order. The saturable absorber is a quantum-dot polymer composite film, which is fabricated by a simple method comprising steps of: mixing a quantum dot material of lead sulfide (PbS) with a colloidal polymer to form a mixture; and drying the mixture at two different temperatures in two stages respectively. The saturable absorber of the present invention has lower saturating intensity and a plurality of absorption bands comprising 1000 nm to 1100 nm and 1500 nm to 1600 nm. The maximum output power and the maximum pulse energy of the passively Q-switched fiber laser system can be superior to those laser systems using the quantum-dot (QD) polymer composite film as saturable absorber.

The invention discloses an LED driving circuit which is connected with a thyristor dimmer and which comprises a rectifying circuit, a bleeder circuit connected with the rectifying circuit, an LED constant-current control circuit, a thyristor turn-on FIRE voltage detecting circuit, a thyristor cut wave angle detecting circuit and a bleeder current control circuit. The thyristor cut wave angle detecting circuit generates a first result signal. The thyristor turn-on FIRE voltage detecting circuit generates a second result signal. The bleeder current control circuit, when receiving the first result signal and the second result signal, instructs the bleeder circuit to start a high-efficiency mode in which the bleeder circuit is started by delaying the start time of following preset N half-wavecycles of a DC bus voltage signal Vin with a preset time Tdelay, wherein N is a positive integer. The LED driving circuit can reduce its own loss, improve the driving efficiency of the thyristor, reduce the cost, and saves power in the high-efficiency mode.

The invention discloses a high-power gain optical fiber capable of simultaneously inhibiting mode instability and a nonlinear effect. The optical fiber is a double-cladding layer and sequentially comprises a fiber core and an inner cladding layer from inside to outside, the fiber core is doped with ytterbium or other rare earth ions to serve as a gain medium, the inner cladding layer is a quartz cladding layer, and the diameter value of the fiber core is 15-100 microns; the numerical aperture NA of the fiber core ranges from 0.01 to 0.1; the cross section of the inner cladding is a regular octagon; the value of the diameter of the inner cladding is 300-1200 microns; the cladding pumping absorption coefficient@915 nm is 0.2 to 1.0 dB / m; the optical fiber is bent and coiled, and the bendingradius is between 2.5 cm and 80 cm. According to the invention, the parameters influencing the thresholds of the nonlinear effect and the mode instability effect in the optical fiber are substituted into the theoretical model for calculation; in combination with the existing process level and experimental conditions, optical fiber parameters and bending radiuses capable of meeting the requirementsof a high-power optical fiber laser and inhibiting gains of a nonlinear effect and a mode instability effect at the same time are selected, and the mode instability threshold and the nonlinear effectthreshold are changed at the same time, so that the maximum output power of the optical fiber is improved.

The present invention provides a 795nm quantum well laser based on an AlGaAs / GaInP active region. The epitaxial structure comprises a substrate, a buffer layer, an N-type lower limit layer, a lower waveguide layer, a quantum well layer, an upper waveguide layer, and P-type upper limit layer and an ohmic contact layer from the bottom to the top. The upper waveguide layer and the lower waveguide layer are made of an aluminum-free material gallium indium phosphate, the quantum well layer is made of an aluminum gallium arsenide material, and a wide waveguide semi-aluminum-free active region is formed by the waveguide layers and the quantum well layer. According to the 795nm quantum well laser, the special requirements of a pump laser with the application of a small and simplified self-doubledlaser crystal can be satisfied, at the same time, the influence of the roughness of a growth interface and an episodic field at a cavity surface on the service and reliability of the laser can be reduced effectively by an optimized laser structure.

The invention discloses a preparation method of a microbial fuel cell anode biochar composite material. The preparation method comprises the steps of (1) preparing a biochar anode; and (2) preparing the anode biochar composite material of the microbial fuel cell. The invention further discloses the microbial fuel cell anode biochar composite material prepared by the method. According to the microbial fuel cell anode biochar composite material disclosed by the invention, the biochar anode is modified by utilizing a graphene / polyaniline composite material; compared with a traditional anode material, the novel biochar anode has better biocompatibility and good electrochemical performance; the modified electrode can effectively exert the advantages of good GO conductivity and high PANI biocompatibility; and the electricity generation performance of the MFC is remarkably improved.

The invention discloses an ultra-wideband white noise source based on parallel connection of multi-channel multi-mode chaotic lasers, which generates ultra-wideband white noise by adopting the parallel connection of the multi-mode chaotic lasers. Compared with the existing electronic noise source, the ultra-wideband white noise source is relatively simple in structure and easy to implement. In addition, the ultra-wideband white noise source adopts a method of photoelectric conversion, effectively avoids the bottleneck of the electronic bandwidth and can greatly improve the bandwidth for generating white noise. The power of generating the white noise depends on the power of the chaotic lasers and the responsibility of a photoelectric detector, so that the power of generating the ultra-wideband white noise is adjustable, and the maximum output power is higher.

The constant vacuum degree mixer is used for oil burning engine, gas burning engine and oil and / or gas burning engine. Using the constant vacuum degree mixer in engine can make automobile and motorcycle saving energy by over 15 %, possessing excellent starting performance, stable idle performance, accurate gas distribution and greatly lowered exhaust pollution. The present invention has simple structure, low cost and high producibility.

A power amplifier circuit includes an amplifying transistor and a dc bias circuit for biasing the amplifier transistor to obtain a conduction angle of at least about 180 DEG . The dc bias circuit includes a dynamic bias boosting circuit for increasing the dc bias current provided to the amplifying transistor by the dc bias current in direct proportion to an increase in the input signal provided to the power amplifier. An input to the dc bias circuit is coupled to a stage of the power amplifier circuit by a capacitor. The bias boosting circuit permits the power amplifier circuits to operate in Class B or Class AB with improved linearity, improved efficiency and reduced idle current.

The invention discloses a control circuit applied to a power amplifier circuit. The power amplifier circuit comprises a first transistor, a second transistor and a third transistor, wherein the thirdtransistor is directly connected to a power supply through an inductor; the control circuit comprises a waveform shaping circuit and a voltage generation circuit, wherein the waveform shaping circuitis used for generating a first current through a reference voltage control signal of the power amplifier circuit, comparing the first current with a reference current value to obtain a second current,generating a mirror current by utilizing the second current, and obtaining a first grid voltage by utilizing the mirror current, wherein the first grid voltage is used for the second transistor to control the first transistor to amplify an input signal in order to obtain an output signal; and the voltage generation circuit is used for generating a second grid voltage by utilizing the first grid voltage, and controlling the third transistor to output the output signal meeting the stable output characteristic by utilizing the second grid voltage. The invention further discloses the power amplifier circuit and a control method.

The invention discloses a stacked radio frequency power amplifier with optimal matching, comprising an input matching circuit, an output bandwidth matching circuit, a biasing circuit A, a biasing circuit B, and a power amplifying circuit formed by stacking at least two transistor drain and source electrodes through inductors; a signal source is connected with a gate electrode of a transistor in the bottommost layer of the power amplifying circuit through the input matching circuit, and the biasing circuit B is also connected with the gate electrode; the biasing circuit A is connected with gate electrodes of remaining transistors of the power amplifying circuit, and these gate electrodes are grounded through connecting gate capacitors; a drain electrode of a transistor in the uppermost layer is connected with a load through the output bandwidth matching circuit. This circuit not only provides an improvement in the output-grade voltage withstand capacity and current drive capacity of the radio frequency power amplifier and an improvement in the output impedance of the power amplifier, but also provides an improvement in the overall linearity of the power amplifier.

The invention discloses a novel balanced Schottky frequency doubling structure and a use method thereof. The structure comprises an input waveguide directional coupler, two Schottky diode pairs, two direct current feed networks and a three-port differential output probe, wherein the input waveguide directional coupler can provide two paths of input signals with equal amplitude and 90-degree phase difference for a circuit; the Schottky diode pairs are symmetrically arranged in a mirror image manner; the frequency doubling structure disclosed by the invention can realize intrinsic suppression of odd harmonics and 2N harmonics (N is an even number), the structure has the advantages of high efficiency, relatively wide bandwidth, high circuit integration level and small parasitic loss, and the power capacity and the frequency doubling efficiency of the structure are improved compared with those of an existing balanced Schottky frequency doubling structure.

The invention discloses a water pump with adjustable pressure control, which includes a fixed base plate, a connecting plate structure arranged on the side of the fixed base plate, and a plurality of bolts inserted inside the connecting plate structure, and one side of the upper surface of the fixed base plate passes through A motor fixing base is fixed by bolts, an electric motor is fixed on the top of the motor fixing base, a turbocharging mechanism is installed at the end of the motor spindle in the motor, and the bottom of the turbocharging mechanism is fixed on the The upper surface of the base plate is fixed, and a first rotating shaft is installed on one end surface of the turbocharging mechanism. The present invention is used as a water pump for daily use. When working, the maximum output power of the device can be increased by adding auxiliary equipment. In addition, the device has an adjustable pressure control mechanism, which can automatically control the maximum output pressure. When it reaches At the maximum value, the motor can do useless work and will not continue to deliver water, thereby preventing water waste.

The invention discloses a dynamic coupling pure-electric drive axle and a control method thereof. The drive axle mainly comprises a central motor, two hub motors, two planet mechanisms, five brakes and four dead axle gear pairs. A sun gear and a gear ring of three elements of each planet mechanism serve as two input ends or one element serves as an input end, and a planet carrier of each planet mechanism serves as an output end. The central motor is connected with the sun gears of the planet mechanisms on the corresponding sides through two corresponding dead axle gear pairs, the two hub motors are connected with the gear rings of the planet mechanisms on the corresponding sides, the planet carriers on the two sides are connected with rims on the corresponding sides through transmission shafts to serve as output ends, power is finally transmitted to the rims through the planet carriers, and a vehicle is driven to run. By the adoption of the structural scheme, different working modes can be achieved according to the actual road condition requirements, the high requirement of the vehicle for the dynamic property can be met, a power source works in an efficient area, and the economical efficiency of the vehicle is improved. Meanwhile, the unsprung mass of the vehicle is reduced, and the riding comfort and control stability of the vehicle are improved.

The invention discloses a control system and a control method for improving the output efficiency of a photovoltaic array under partial shadow. The control system comprises a shadow detection module, a DSP (digital signal processing) controller, switch blocks and the photovoltaic array. The shadow detection module is connected with the DSP controller, the DSP controller is connected with the switch blocks, and the switch blocks are connected with the photovoltaic array. The control method includes detecting photovoltaic modules by the aid of the shadow detection module in real time to determine whether the photovoltaic modules are shielded by shadow or not; controlling the switch blocks by the aid of the DSP controller according to detection results of the shadow detection module; swapping the photovoltaic modules which are shielded by the shadow for the photovoltaic modules which are not shielded by the shadow so as to discretize the shadow. The control system and the control method have the advantages that the partial shadow can be discretized, accordingly, negative influence of the partial shadow on integral photovoltaic systems can be reduced, the maximum output efficiency of the photovoltaic array can be improved by 20% approximately, the power generation efficiency of the photovoltaic systems can be effectively improved, and the control system is effective and is easy to implement as compared with modular and reconstructive photovoltaic power generation systems.

The embodiment of the invention discloses a mobile payment apparatus. The mobile payment apparatus comprises a master control chip which is used for receiving account information data as input and outputting FSK signals which take square waves as fundamental carrier waves and carry two-magnetic-track data information after FSK modulation through an IO port; a first time delay buffer circuit which is used for receiving first FSK signals output by a first output port of the master control chip and outputting first driving signals to the first input end of an MOS tube bidirectional driving circuit; a second time delay buffer circuit which is used for receiving second FSK signals output by the second output port of the master control chip and outputting second driving signals to the second input end of the MOS tube bidirectional driving circuit; the MOS tube bidirectional driving circuit which is used for driving an emission coil and has two output ends connected in parallel with the emission coil and a shunt capacitor; and the emission coil which is used for emitting magnetic pulse signals carrying the two-magnetic-track data information to a POS terminal. According to the embodiment of the invention, a termination magnetic head of the POS terminal can capture and identify a pulse magnetic field of the emission coil more conveniently.