34results about How to "Overcoming power" patented technology

The invention discloses a positive and negative pulse charging converter for a storage battery. A bilateral full-bridge LLC (Logical Link Control) resonant circuit is taken as a main charging topology, so that the defect that the implementation of negative pulses is limited by application occasions and power levels is overcome while soft switching is realized. Meanwhile, a power main circuit comprises a bridge type uncontrollable rectifying circuit and a bilateral full-bridge LLC resonant circuit. During discharging of the storage battery, the bus capacitive voltage on a high-voltage side, namely, a rectifying side is raised. During initial charging at a positive pulse charging stage, open-loop control is adopted, namely, the duty ratios and frequencies of switching tubes Q1-Q4 are kept the same as the duty ratios and frequencies in a previous charging period. Since the bus capacitive voltage is high, the charging current is increased correspondingly and decreased gradually till a charging controller works normally, and the charging current is stable. In this way, sharp pulse charging current is formed in order to enhance the repair, namely, depolarization effect of the storage battery. Moreover, both the charging current and discharging current of the storage battery are under high-frequency pulsation, and an LC filter filters higher harmonics of the charging current while smoothening the high-frequency pulsation.

The invention discloses a drilling type side-wall coring apparatus, which is consisted of ground electrical control system and down-hole coring system. The ground electrical control system is connected with the down-hole coring system by a high-voltage high-current collecting ring and a logging winder cable. The down-hole coring system is consisted of a halter, electron section, pressure balancing apparatus, hydraulic section and a mechanical section from above to below in series. The side-wall coring apparatus is put to down-hole by the logging winder cable, a natural gamma instrument is provided to trace and check depth of the same. When the coring object position is determined, signal is sent out by the ground electrical control system, and the down-hole coring instrument is driven to execute motions of pulling-against, drilling, core-folding, drilling back, stop pulling-against and core-storing. Meanwhile, real-time monitoring of instrument working condition and coring process are made by various sensing units, and recording data is transmitted to ground control system by the cable. Stratum core is acquired by side-wall vertically rotary drilling, which is accomplished by controlling down-hole instruments through the real-time digital display panel.

The invention relates to a device for using intracavity self-adaptive optical technique to improve the solid laser beam quality which is formed by a He-Ne laser, a variable density fading disk, a beam-amplifying system, a distorting lens, a solid laser yield medium, a matching beam-amplifying concave mirror, a beam splitter, an output coupling mirror, a Hageman wave front sensor, a power meter, a high pressure amplifier, a high speed processor and a host computer, wherein the He-Ne laser sent light beacon is leaded into the solid laser yield medium by the concave mirror and is divided into two paths of signal by the beam splitter, one path uses the output coupling mirror to output the laser beam of the solid laser beam; the other path uses the Hageman wave front sensor to real-time probe the intracavity image differential information and uses the high speed processor to process it and obtains the corresponding voltage control signal; it adds the voltage to the deformation driver so that it can compensate the intracavity image difference of the solid laser.

The invention discloses an optical fiber beam combiner and a manufacturing method thereof. The optical fiber beam combiner comprises active optical fiber and passive optical fiber, wherein the active optical fiber and the passive optical fiber are combined along an axial surface or contacted along an axial line. The manufacturing method for the optical fiber beam combiner comprises the following steps of: axially combining an active optical fiber glass rod with a passive optical fiber glass rod to form a compound optical fiber preformed rod; drawing the compound optical fiber preformed rod into optical fiber to obtain the optical fiber beam combiner. The optical fiber beam combiner realizes the integration of the active optical fiber and the passive optical fiber and facilitates distributed pumping of all-optical fiber lasers, the pumping coupling efficiency is improved, the power consumption is small, the tolerance laser power level and the reliability are improved, the production efficiency is improved, the manufacturing cost is lowered, and the optical fiber beam combiner is suitable for large-scale production.

The invention discloses an engine with air supply devices, belonging to the technical field of power machinery. The engine is additionally provided with air supply devices, such as a reciprocating air compressor, a high-pressure air storage tank, an air supply valve and the like. The high-pressure air storage tank supplies air to a cylinder in a jetting way in a compression stroke or an expansion stroke through the air supply valve, and the fixed time of the first air supply is smaller than a crank angle of 140 degrees in front of a compression top dead center. The engine has two working modes of combustion power and air power, and the two working modes can be switched according to the working conditions to form hybrid power drive; and the problem of poor transient response of a turbo supercharged engine is solved, and various problems of power decline, oil consumption increment, discharge deterioration and the like of the engine under plateau conditions due to atmospheric pressure decline and insufficient charge also can be solved. The high-pressure air storage tank can supply a driving force, and the driving force is combined with the combustion power to form an internal combustion air hybrid power system, so that the engine operates in an efficient area to the greatest extent, and the efficiency of the whole power system is improved.

The invention provides a cell searching method. By detecting the cell ID (identity) for multiple times, on the premise that the obtained cell ID is correct, the detection of broadcasting signals of three clusters is conducted. By adopting the cell searching method, the influence of factors such as low signal receiving power and disparate system interference can be overcome and the success rate of cell search is improved.

The invention discloses a cascaded microgrid power equal division control method based on a self-adaptive virtual capacitor; the cascaded microgrid comprises a plurality of inverters, and a parallel virtual capacitor is arranged at the output end of the cascaded microgrid; and the virtual capacitor Cx meets the following formula: the cascaded microgrid power equal division control method based onthe self-adaptive virtual capacitor is beneficial to power equal division and easy to control.

The invention discloses a load positioning and power constant control method for a three-dimensional wireless charging system. The method comprises the steps of establishing a magnetic circuit model and a circuit model of a three-dimensional wireless power transmission system, obtaining a constraint relationship of each parameter variable through circuit analysis, obtaining positions (magnetic positions) of loads under different degrees of freedom based on the constraint relationship, and realizing spatial positioning of the loads; meanwhile, determining an optimization target and constraint conditions of the three-dimensional wireless charging system under known parameters , then converting a nonlinear programming problem into a linear programming problem; and finally, realizing the constant load receiving power in a linear programming mode. According to the invention, position (magnetic position) identification of the load under different degrees of freedom can be realized; the constant load receiving power is realized on the basis; and theoretical guidance and technical support can be provided for application and development of the three-dimensional wireless charging system.

The present invention belongs to the technical field of energy recovery, and in particular provides an energy recovery system for an extended-range electric vehicle. The extended-range electric vehicle includes a turbine engine (100), a generator (200), a battery pack (300), a drive motor (400), wheels (500) and a control device (700); the energy recovery system includes a thermal element (600), the thermal element (600) is connected with the control device (700) and the turbine engine (100), and used for converting braking energy of the wheels (500) into thermal energy for heating intake airof the turbine engine (100). According to the invention, the braking energy of the extended-range electric vehicle is converted into heat energy by installing the thermal element, and is used for secondary heating of the gas entering a combustion chamber, thereby improving the temperature of intake air of the combustion chamber, so as to improve the power generation of the unit fuel, the enduranceof the extended-range electric vehicle is prolonged.

The invention relates to an exponential moving average-based air conditioning load demand response method. The method comprises the following steps of (1) obtaining real-time electricity price P<rt> of each electricity price updating cycle; (2) calculating average electricity price P<avg> within n past electricity price updating cycles and an electricity price standard deviation sigma by using a sliding data window according to the real-time electricity price in each electricity price updating cycle; (3) sampling the real-time electricity price according to a set sampling cycle, filtering the sampled real-time electricity price by using an exponential moving average algorithm to obtain filtered electricity price P<ema>; (4) calculating an updated temperature set value T<set> of air conditioning equipment according to the average electricity price P<avg>, the electricity price standard deviation sigma and the filtered electricity price P<ema> obtained in the steps (2) and (3); and (5) adjusting the temperature of the air conditioning equipment by the updated temperature set value T<set>. Compared with the prior art, the exponential moving average-based air conditioning load demand response method has the advantages that power grid impact is reduced, the power quality of a power distribution network is improved and the like.

The invention relates to a distributed fiber Raman amplifier. A light signal enters a transmission fiber through a fiber isolator, a tail end of the transmission fiber is connected with an input end of a wavelength division multiplexer, a pump signal input end of the wavelength division multiplexer is connected with a Raman pump laser device. Output of a signal public end of the wavelength division multiplexer is output of the distributed fiber Raman amplifier, and an amplified light signal is outputted. The transmission fiber of the distributed fiber Raman amplifier is inserted with one or two saturable absorbers for inhibiting Rayleigh noise. The absorber can be a semiconductor saturable absorber or a carbon nanotube saturable absorber. Length of the transmission fiber divided into two segments is about one half of a total length when one saturable absorber is inserted, length of the transmission fiber divided into three segments is about one third of the total length when two saturable absorbers are inserted. The distributed fiber Raman amplifier can further be a bidirectional pump distributed fiber Raman amplifier. The distributed fiber Raman amplifier effectively inhibits gain of the Rayleigh noise, realizes Raman amplification with high gain and low noise and improves an all-optical relay distance of fiber communication.

The invention provides a manufacturing method and trimming die for a primary iron core disk of a long primary linear electric motor. The method is characterized in that a continuously automatic notching blanking mode is adopted to place a multislot of the primary iron core disk of the long primary linear electric motor in a high-speed punch press, and dies on the high-speed punch press are utilized to finish a blank operation in the continuously automatic blanking mode; each punching motion cycle of the punching dies on the high-speed punch press is only used for finishing one to two opened inserted line slots and punching one to two groups of pilot holes or other cavities at the same time; and all the opened inserted line slots and pilot holes or other cavities on the primary iron core disk of the long primary linear electric motor meet a blank procedure requirement step by step by using a plurality of circularly and continuously automatic blanking procedures which are set. The trimming die comprises an upper die and a lower die, wherein a fixed plate of the upper die is provided with punching inserted line slot punches, more than two pilot hole punches and one or two auxiliary hole punches, and the punching inserted line slot punches are floating punches; an upper die plate is provided with pulling trays which can slide on the tops of the punching inserted line slot punches.

The invention discloses an 18-pulse-based SVPWM three-phase electronic voltage regulator. The voltage regulator comprises a main circuit, a central control circuit, an output voltage detection circuit, an overcurrent detection circuit, a pulse isolation amplifying circuit, a keyboard and display circuit, a first control power supply and a second control power supply, wherein the main circuit comprises a three-phase uncontrollable rectifier, a direct current filter and a three-phase IGBT inverter; and the central control circuit comprises a microprocessor and a pulse separation output circuit. The output alternating current voltage of the voltage regulator provided by the invention is subjected to an 18-pulse space voltage vector pulse width modulation technology and voltage closed loop control, so that the voltage regulator is high in power factor, low in harmonic and high in voltage stability; the shortcomings of low power factor, high harmonic and low voltage stability of thyristor phase-shifting control are overcome; an iron core and a winding of the conventional electromagnetic inductance type voltage regulator are not required, so that the voltage regulator is light in weight, small in volume and convenient to carry; and in addition, the voltage regulator is simple in circuit structure and reliable, and can be widely applied to any occasions requiring variable power supply voltages.

The present invention provides a centrifugal chemical water pump comprising a pump body, an impeller, a motor driving the impeller. The pump body comprises a pump base, a pump cavity and a pump cover. The pump cavity is mounted on pump base, a ring protruding edge according to involute curve shape is arranged on side wall of pump cavity, the two ends of protruding edge are provided on two sides of water outlet, the side wall thickness of protruding edge changes gradually from thick to thin. The water outlet direction is identical to the tangent direction of most involute curve on side wall ofprotruding edge. The impeller in umbrella shape mounted in pump cavity comprises a lamina bracket wheel, an impeller cover, a water inlet, a water outlet. The impeller cover superposed on lamina bracket wheel, and the space forms impeller outlet, the height of water outlet can be adjusted by changing height of impeller. The pump cover is mounted on upper hull of pump cavity, the wall from inside of bottom of pump cover to inlet in center is inverse umbrella shape, and the surface combining dimension of pump cover and impeller are identical.

The invention provides a variable step size perturbation observation MPPT algorithm based on a dichotomy. The method comprises the steps that an appropriate disturbance voltage range is set, the initial disturbance step size accounts for one half of the appropriate disturbance voltage range, it can be judged whether or not reverse disturbance is needed during disturbance, if yes, the disturbance step size is halved, and if no, disturbance is carried out in the same direction with the current step size; the maximum power point is tracked through continuous iteration, a comparison method is usedduring iteration each time, the maximum power point of a system is updated by comparing the current maximum power point, a power point in the n time and a power point in the n+1 time during iteration, disturbance is stopped until the end conditions are met, and the maximum power point of the system is determined. In addition, when the external temperature and illumination change, a new maximum power point range is rapidly found through an a-time method, and then the new maximum power point is rapidly tracked by reusing the dichotomy. The variable step size perturbation observation MPPT algorithm based on the dichotomy solves the problems of most algorithms that the tracking speed is not fast enough, the maximum power point has oscillation, the algorithms are complex, and the implementation cost is high.

The invention discloses a device and a method for collinear transmission of a two-wire system data / power supply for supplying power for an overall intelligent terminal. The device comprises a plurality of network units which are arranged at different levels, wherein each network unit comprises a host and n extension units which are matched with the host; the host is connected with each of the n extension units through a two-core bus; the functions of supplying power from the host to the n extension units and transmitting data in two ways are realized; n is a natural number. According to the device and the method for the collinear transmission of the two-wire system data / power supply for supplying power for the overall intelligent terminal, the defects that a circuit is complex in structure, liable to damage, low in power supply power, narrow in application range and the like in the prior art are overcome; the aims that the circuit is simple in structure, unlikely to damage and capable of supplying power for the extension units at high power are fulfilled.

The invention relates to an internal combustion engine and provides a repeated pressure boosting internal combustion engine which can separately complete an energy conversion process and is high in energy utilization efficiency, low in fuel consumption rate and high in speed, torque and power. According to the main principle of the repeated pressure boosting internal combustion engine, the suction process, the compression process, the acting process and the exhaust process are separately conducted in two air cylinders which are different in size, effective pressure in the air cylinders is increased at the time of acting through self structures, as a result, the combustion process is improved, and thermal efficiency is also improved; moreover, matched with a turbocharger, a compression air cylinder 2 can suck in more air in a high speed stage to support the combustion of fuel. The repeated pressure boosting internal combustion engine has the advantages of being simple in structure, high in thermal efficiency, wide in operation adjustable range, low in oil consumption, good in acceleration performance, sufficient in power at a low speed, and strong in power at a high speed; moreover, acting frequency is doubled, the rotating speed range is substantially expanded, and therefore vibrations are reduced; due to the supercharged effect after combustion, the combustion process is improved, the fuel can be combusted more sufficiently and thoroughly, and the emission performance is better.

A steering lamp LED module alarm module is composed of a circuit board (1) and an LED circuit board (2). The LED circuit board (2) is provided with LED particles (11) and resistors (12). The steering lamp LED module alarm module is characterized in that the LED particles (11) are powered up by a drive control IC (22), the LED particles (11) are monitored in real time by a current detection resistor (21) and a single chip microcomputer (23), the current of each LED is controlled to be 150 ma 0.5 W, an MOS transistor (24) and a power resistor (25) constitute additional power, and accordingly the output power reaches 21 W. By means of the steering lamp LED module alarm module, the problem that the power of a steering lamp LED module is not matched with the power of a halogen lamp light source is solved, LED module faults can be detected, the current of an entire lamp is basically made to be zero when drive output is closed, and a Flasher of an entire vehicle flashes quickly and gives an alarm.

The invention relates to an optical element achieving axial uniform linear focal spots. The optical element achieving the axial uniform linear focal spots is a lens or a reflector. At least one face of the lens or the reflector is a curved face. Incident rays which are distributed transversely at will are focused to the optical axis of the optical element through the lens or the reflector and show uniform linear focal spots. The curved face is an aspherical face. The axial uniform linear focal spots generated by the aspherical optical elements are not influenced by processing materials any more. The optical element achieving the axial uniform linear focal spots overcomes the defects that by the adoption of the 'filamentation' effect, the requirement for the processing materials is strict, the processing parameter 'window' is small, and the influence of material surfaces on the focal spots is large; and only one optical element is used for generation of the linear focal spots, processing of the element can be achieved through the prior art, and the complexity generated by a Bessel beam is overcome. The axial length of the linear focal spots is not limited theoretically, and the laser energy loss is the minimum. The optical element achieving the axial uniform linear focal spots overcomes the defects that the focal depth range of the Bessel beam is limited, and the peak power of the Bessel beam is low.

The invention discloses an orthogonal line polarization birefringence double-frequency Nd: YAG laser, which comprises an LD controller, the LD controller is sequentially connected with an LD pumping source and an LD tail fiber through a cable, and a self-focusing lens, an Nd: YAG crystal and an F-P etalon are sequentially arranged along the propagation direction of pump light output by the LD tail fiber; a quarter-wave plate and an output coupling mirror are sequentially arranged in the transmission direction of the output light side of the F-P etalon, a piezoelectric ceramic tube is arranged on the side, away from the quarter-wave plate, of the output coupling mirror, and the piezoelectric ceramic tube is connected with an adjustable direct-current voltage source through a cable. The problem that the PLZT ceramic electro-optical birefringence F-P etalon in the existing electro-optical birefringence double-frequency Nd: YAG laser technology is difficult to process is solved.

The invention discloses a high-temperature gas cooled reactor helium flow control system and method with an incremental adjusting function. The high-temperature gas cooled reactor helium flow controlmethod comprises the following steps: 1) calculating a hot helium temperature correction value for hot helium temperature PID adjustment; 2) calculating a power correction value for power PID adjustment of a unit; 3) calculating a helium flow correction value for helium flow PID adjustment; and 4) performing three-impulse control according to the hot helium temperature correction value for hot helium temperature PID adjustment, the power correction value for unit power PID adjustment and the helium flow correction value for helium flow PID adjustment, and then controlling the reactor accordingto the result of the three-impulse control. The system and method can rapidly tract and control the change trend of a variable, correct and control the output of the variable to meet the functional requirements of peak regulation and frequency modulation of the reactor tracking power grid load.

The invention relates to a far-end pumped erbium-doped fiber amplifier of a fiber Raman laser. A 1,550-nanometer laser is a pumping source of the fiber Raman laser and is connected with one end of a pumping transmission fiber by a three-stage high-reflectivity fiber grating, the other end of the pumping transmission fiber is connected with a frequency multiplier by a three-stage low-reflectivity fiber grating, the frequency multiplier is connected with the erbium-doped fiber amplifier, an optical signal is input into the erbium-doped fiber amplifier, an output end of the erbium-doped fiber amplifier is connected with an optical receiver through an optical signal transmission fiber, a central wavelength of the fiber Raman laser is 1,950+ / -2 nanometers, the pumping transmission fiber is a single-mode silicon-based fiber, the length of the pumping transmission fiber is equal to or smaller than 100 kilometers, and the optical signal transmission fiber is directly connected or is connected with the optical receiver through an optical amplifier. By the erbium-doped fiber amplifier, the transmission distance is improved by dozen times compared with direct transmission of 980-nanometer laser, the noise coefficient of the erbium-doped fiber amplifier is reduced by about 1.5dB compared with the noise coefficient of a 1,480-nanometer remote-pumped optical amplifier, and the noise performance of the far-end pumped erbium-doped fiber amplifier is greatly improved.

The invention provides a robot foreign matter cleaning laser constant-current driving circuit based on switching power supply design, and belongs to the technical field of outdoor mobile robot high-altitude or long-distance foreign matter cleaning. The driving circuit comprises a switching power supply circuit, a five-order Butterworth low-pass filter circuit, an acquisition resistor PI current feedback circuit, a given quantity PWM voltage regulation circuit, a soft start control circuit, a PWM filter circuit, a leakage inductance filter circuit and a high-frequency filter circuit. A constant current feedback circuit enables the current of the whole loop to be constant and stable, a constant voltage circuit enables the power supply voltage of the circuit to be constant, the soft start circuit enables the circuit to be started slowly and reduces the current overshoot, the Butterworth filter circuit enables the circuit to be started slowly and reduces the wave and the voltage of the circuit to be stable, the leakage inductance circuit reduces the spike pulse, and the PWM filter circuit eliminates the post-stage self-excited oscillation. And the high-frequency filter circuit filters high-frequency components in the line.

The invention discloses a carbon nanofiber / lithium titanate composite electrode material as well as a preparation method and application thereof. The preparation method specifically comprises the following steps of: (1) taking a copper sheet as a positive electrode and a platinum sheet as a negative electrode, soaking the positive electrode and the negative electrode in a copper sulfate aqueous solution, and preparing copper nanoparticles by an electro-deposition method; (2) preparing carbon spiral nanofibers by taking the copper nanoparticles as a catalyst and acetylene as a carbon source through a plasma chemical vapor deposition method; (3) by taking the carbon spiral nanofibers as a carrier and titanium tetrachloride and deionized water as reaction sources, depositing a layer of uniform titanium dioxide on the surfaces of the nanofibers by utilizing an atomic layer deposition means; and (4) placing a product in a lithium hydroxide solution, carrying out hydrothermal reaction, and carrying out heat treatment in an argon atmosphere. According to the prepared carbon spiral nanofiber / lithium titanate composite material, the lithium titanate nanosheets are compounded on the surfaces of the carbon spiral nanofibers, a core-shell cross-linked porous structure is formed, high energy, high power density and long cycle life are achieved; and the preparation method is simple, convenient and easy to control.

The invention provides a method and device for preparing subacid electrolyzed water with controllable and stable concentration, and the method comprises the steps: adjusting the liquid adding speed of a first liquid adding device according to a difference value between a detection voltage U < measured > and a control voltage U < controlled > in an electrolytic bath, so that the first liquid adding device adds an electrolytic stock solution into the electrolytic bath in real time; therefore, the subacid electrolyzed water with controllable and stable concentration is prepared; the device comprises an electrolytic stock solution storage device, an electrolytic bath and a first mixer which are sequentially connected, a first liquid adding device is connected between the electrolytic stock solution storage device and the electrolytic bath in series, and the electrolytic bath is connected with a current and voltage control unit and a current and voltage detection unit. According to the method and the device for preparing the subacid electrolyzed water with the controllable and stable concentration, provided by the invention, the defects of uncontrollable and unstable concentration and low effective power of the existing subacid electrolyzed water preparation are overcome.

The invention belongs to the technical field of flexible dynamic sealing, and provides a telescopic cooling liquid conveying device which comprises a shell and an inner cylinder, the shell comprises a shell insertion end and a shell fixing end, the inner cylinder comprises an inner cylinder insertion end and an inner cylinder fixing end, a through hole formed in the inner cylinder is communicated with the inner side of the shell, a pressure relief opening is formed in the shell, and a pressure relief valve is arranged in the pressure relief opening. A sealing combination is arranged on the inner side of the outer shell inserting end of the outer shell and tightly clamped on the outer side of the inner barrel, a guide sleeve for holes is arranged on the outer side of the inner barrel inserting end of the inner barrel, and a guide sleeve for shafts is arranged on the inner side of the outer shell inserting end of the outer shell. The device overcomes the contradiction between high power and high maneuverability of the radar array plane, can ensure that the normal transmission of large-drift-diameter high-flow cooling liquid is always kept in the working and withdrawing processes of the radar array plane, can meet the transmission of media such as water, hydraulic oil, corrosive fluid and gas, has a wide application prospect, and is suitable for popularization and application. The problem of transmission of telescopic fluid media in a severe environment is solved.

The invention relates to a preparation method and application of a titanium nitride-polypyrrole nano composite material, wherein the method comprises the following steps: taking a carbon paper as a substrate material and growing a titanium dioxide nanofibrous membrane on a surface of the substrate material; performing nitridation treatment for the carbon paper which supports the titanium dioxide nanofibrous membrane to obtain the carbon paper which supports a titanium nitride nanofibrous membrane; depositing polypyrrole on the carbon paper which supports the titanium nitride nanofibrous membrane through a normal pulse voltammetry, and obtaining the titanium nitride-polypyrrole nano composite material. The formed titanium nitride-polypyrrole nano composite material is a polyporous structureand has huge specific surface area and extremely high porosity, such structure is beneficial for increasing deposit rate of polypyrrole and the specific surface area and improving energy storage property of the material. The titanium nitride-polypyrrole nano composite material prepared by the preparation method provided by the invention can be used as an electrode material for a supercapacitor well.

A cavity impedance band elimination filter provided by the present invention comprises a cavity in which a plurality of orderly arranged resonant cavities are arranged, resonators are arranged in the resonant cavities, and each resonator is composed of an oscillation cavity, a conversion cavity, a tube socket, a feed terminal, a bulk effect diode and a dielectric resonance rod. The oscillation cavity is arranged in the radial direction of the tube socket, the conversion cavity is arranged in the axial direction of the tube socket, and the bulk effect diode is arranged at one end of the conversion cavity. The feed terminal is arranged at the other end of the conversion cavity, the dielectric resonance rod is fixed in the oscillation cavity, and transmission lines in a rectangular wave shape are also arranged in the cavity and are connected with the ends of the resonators far away from the feed terminals. By the above mode, and according to the present invention, a power level of outputting a microwave signal and a frequency spectrum purity performance can be improved.

The invention discloses an overtemperature protection device, an electric motor and an overtemperature protection method thereof. The device comprises an overcurrent protection unit and / or a PTC protection unit, wherein the overcurrent protection unit is configured to reduce the current current by controlling the load power of the motor to which the power device belongs when the current current ofthe power device to be protected is greater than or equal to a set overcurrent detection value; and / or, the PTC protection unit, together with the power device to be protected, is configured to reduce the current current of the power device by increasing its own resistance in a case where the current temperature of the power device is greater than or equal to a set thermosensitive temperature value, thereby reducing the current temperature. The scheme of the invention can solve the problem of inaccurate temperature sampling in the temperature detection using the temperature or the functionalrelationship between the temperature rise and the current, so as to achieve the effect of improving the accuracy of the temperature sampling.

The invention discloses a multi-tube blue light semiconductor frequency doubling method and device based on spectral beam combination, which belongs to the technical field of semiconductor laser. The method specifically comprises the following steps of S1, exciting a blue light diode array to emit a plurality of light beams which are incident to the same area, S2, diffracting the multiple light beams entering the same area at the same diffraction angle to form combined light, S3, reflecting one part of the combined light back to the blue light diode array to form feedback for compressing the line width, and transmitting the other part of the combined light to output a narrow-line-width light beam, S4, forming oscillation on the narrow-line-width light beam output through transmission, and meanwhile conducting frequency doubling and then conducting output, and S5, enabling the output light after frequency doubling to be split and then focused, and outputting deep ultraviolet light. The invention further provides a multi-tube blue light semiconductor frequency doubling device based on spectral beam combination. The method and the device provided by the invention are a novel pulse power supply pumping multi-tube blue light diode array frequency doubling system, and can improve the frequency doubling efficiency of input blue light and the power of output deep ultraviolet light.