112results about How to "Increase design difficulty" patented technology

The invention discloses a dual polarized one-dimensional tightly coupled ultra wide band and wide angle sweep phased array antenna, which comprises two columns of horizontal polarization and 26 rows of vertical polarization interdigital coupled dipole antennas. The basic structure of the phased array antenna comprises upright parasitic printing medium plates for wide angle scanning, upper layer horizontal polarization interdigital dipoles, medium plates, lower layer vertical polarization interdigital dipoles as well as their horizontally extending parts, vertical polarization dipoles as well as their uprightly gradual changing and extending parts, the gradual changing microstrip line feed structures for performing feed at the ports of the dipoles, reflection grounding plates, metal enclosures at two sides of the grounding plates, power dividers and 50-ohm coaxial adapters. The tightly coupling structures among the units help the antenna achieve an ultra wide band effect. A wide angle scanning function can be achieved because parasitic printing medium plates are introduced to take the place of conventional and heavy wide angle resistance matching layers with the consequence of reduced weight and size.

The embodiment of the invention provides an organic light-emitting display panel and an organic light-emitting display device. The organic light-emitting display panel comprises first subpixels located in a first display area, second subpixels located in a second display area, a plurality of signal lines and a plurality of load units, wherein the number of rows of any column of first subpixels issmaller than that of any column of second subpixels; the plurality of signal lines include a plurality of first signal lines and a plurality of second signal lines; the first signal lines are electrically connected with a thin-film transistor corresponding to one column of first subpixels; the second signal lines are electrically connected with the thin-film transistor corresponding to one columnof second subpixels; and the plurality of load units are used for increasing load of the first signal lines and are located in a wiring area. According to the organic light-emitting display panel andthe organic light-emitting display device, the plurality of load units are used for increasing the load of the first signal lines are added, so that the difference between the load corresponding to the first signal lines and the load corresponding to the second signal lines can be reduced, the display difference of the organic light-emitting display panel can be reduced and the display effect canbe improved.

A lateral pumped fiber structure comprises: at least one active optical fiber, which is used to generate laser or amplify the laser; at least one passive optical fiber, which is used to connect a pumping source. The active optical fiber and the passive optical fiber form an optical contact in a radial direction. The manufacturing method of the lateral pumped fiber structure comprises the following steps: 1) respectively preparing an active optical fiber performing rod and a passive optical fiber performing rod; 2) respectively performing wire drawing to the prepared active optical fiber performing rod and the passive optical fiber performing rod and making the active optical fiber and the passive optical fiber; 3) coupling at least one active optical fiber to at least one passive optical fiber so that the optical contact in a radial direction between the active optical fiber and the passive optical fiber can be formed. By using the fiber structure of the invention, pumping efficiency is high; a manufacturing technology and coupling equipment are simple; costs are low. The fiber structure of the invention is especially suitable for a high power optical fiber laser and an optical fiber amplifier.

The invention discloses an unshielded three-reflector optical system, which can be used in a wide spectral imaging system with wave band from ultraviolet to infrared, and is particularly applicable to a preposed object lens of a spectrum imager. The system consists of a main reflector, a secondary reflector and a third reflector with aperture ratio of 1 / 0.5-1 / 3; the system avoids shielding through inclining elements; a beam path of the system is telecentric beam path in the image side; a principle ray of zero field coverage is spread along links of the vertex of each element; a diaphragm is arranged on the secondary reflector; the secondary reflector is arranged on a focal plane of the third reflector; focal power of the main reflector, the secondary reflector and the third reflector is positive, negative and positive respectively; curvature radiuses of the vertexes of the three reflectors approximately meet the condition of Petzval; and types of the three reflectors are Zernike free surfaces. The system has reasonable residual aberration distribution to greatly improve image quality, and can easily avoid shielding, so that the effective use area of each mirror face is equivalent to an original mirror; and the primary ray of the zero field coverage of the system moves along the links of the vertex of each surface, thereby facilitating the processing, assembly and regulation of the system.

The invention provides a six-phase flux switching type permanent magnet motor which comprises stators, rotors and a rotating shaft, wherein each stator adopts a permanent magnet double salient structure, that is, the permanent magnet, the stator core and the armature winding are arranged on each stator, the stator core is assembled by an U-magnetic core and each permanent magnet embedded in the magnetic core, and the permanent magnets are of tangential alternate magnetization; the armature winding is of six-phase armature winding arranged on the stator, the six-phase armature winding adopts centralization coils, and the rotors are made of permeability magnetic material; the magnetizing directions of the permanent magnets are of the tangential of the stator circle, and the magnetizing directions of two adjacent permanent magnets are opposite to each other; the number of the armature coil and the stator groove is even number times of the phase number; and each phase 2n coils winding, and n coils are distributed at the two ends of the diameter of the stator circle respectively. And two three-phrase winding can conduct independent power supplying and generating.

The invention belongs to the technical field of integrated circuits and relates to a design of a phase shifter applied in an X-wave band (8-12 GHz) phased array receiver. The phase shifter consists of a transformer type balun, a multiphase filter, four sub phase shifters and a combiner circuit, wherein in the picture one, the phase shifting precision of the four sub phase shifters is 3-digit, and 8 phase shifting states are realized in the range of 0-360 degrees by the sub phase shifters through taking 45 degrees as a phase shifting step value; in the picture three, the four sub phase shifters and other circuits form an X-wave band phase shifter of which the phase shifting precision is 5-digit, and 32 phase shifting states are realized in the range of 0-360 degrees by the phase shifter through taking 11.25 degrees as a phase shifting step value. Firstly, a signal VIN in input at a single end, differential signals VIN+ and VIN- are obtained by the transformer type balun, a group of orthometric differential signals VIN_I+, VIN_I-, VIN_Q+ and VIN_Q- are obtained after the differential signals VIN+ and VIN- pass by the multiphase filter, the group of orthometric differential signals are the input of the sub phase shifters, and after the output signals of the four sub phase shifters are compounded by the combiner circuit, output signals VOUT+ and VOUT- are obtained.

The invention provides a method for designing a multi-controller memory array. In the method, more than two controllers are arranged in a system to monitor the states of failover and a hot plugging function in real time, and the system performance is approximately linearly improved with the increase of the number of the controllers. A module adopted in the designing process comprises a controller unit, a switching unit, a data caching unit, a memory cell and a power supply radiating unit, wherein the data caching unit is an independent functional unit not attached to the controllers; interconnectivity and sharing are realized between the controller unit and the caching unit through a high-speed network unit and various configuration management and status information; and flexible configuration can be performed, such as adding or deleting components in the system on line, and the like. The flexibility is embodied in that the caching unit is independent from the controllers to organize an independent memory space, and access control is performed through a network interconnection unit, so the design difficulty of the system is improved, and the reliability is increased.

The invention relates to an autonomic optimal track following design method of a free base butt-joint device, belonging to the field of motion planning and control. The invention provides a free base butt-joint device which solves the problems existing in a fixed base butt-joint device and can not be limited by fixed orbits to freely move to complete more complicated butt-joint tasks. In addition, the free base butt-joint device has more flexible movement, lower cost and higher control requirement. The invention also relates to the automatic optimal track following method by combining genetic algorithm, optimal control, and other related technologies. With the autonomic optimal track following design method, the free base butt-joint device can automatically select an optimal track in real time to complete a track following task of the free base butt-joint device.

The invention discloses a scheme of a novel phased array antenna which is low in cost and based on a cross coupling control technique among array elements and can reduce greatly overall cost and weight of phased array radars based on the fact the antenna array performance is not degraded. Some array elements in the scheme are connected to output ports of a feed network to perform direct feed, and the others perform indirect feed through cross coupling which is can be controlled flexibly, so that a novel array structure which is sparse for the feed network and is dense for array caliber surface is formed. The innovation of the low-cost phased array antenna based on the cross coupling control is that the cross coupling among the array elements is utilized but not restrained to perform coupling excitation for dummies in an array, so that the novel phased array antenna with low cost and light weight is established. The established phased array antenna combines a plurality of advantages, a periodical sparse antenna array structure guarantees that the antenna array has light weight, the cost of the phased array antenna is reduced to about half of the cost of the existing phased arrays, and the low-cost phased array antenna based on the cross coupling control can be used for wireless communication and radar systems.

An integrated electronic module based on discrete elements for electric power features that the power elements, driver, controller and protecting circuit are integrated in a function module with pins to connect with less external elements. Its advantages include high technical performance and reliability.

The invention discloses a method and a device for detecting wearing state of wearable equipment. The method includes: the step of calculating, collecting light signals according to on-off condition of light for detecting heart rate, and calculating a differential signal value DCVAL; the step of first judgment, determining whether the DCVAL is within a non-worn range, a normal range or an excessive range according to a relationship between the DCVAL and preset lower limit value, upper limit value and maximum value, wherein when the DCVAL is within the normal range, the wearable equipment is determined in a worn state. According to the method and the device for detecting the wearing state of the wearable equipment and the wearable equipment comprising the device, whether the wearable equipment is in a worn state or not can be recognized in a manner of simple calculation, short consumed time and less power consumption without adding additional structure and increasing design difficulty; when the circumstance that the wearable equipment is not worn is determined, a heart rate detection unit comprising an LED lamp can be turned off, so that power consumption can be reduced, and adverse influence on life can be reduced.

The invention provides a single-phase AC-DC conversion circuit of directional power. The single-phase AC-DC conversion circuit of the directional power comprises a power circuit, an auxiliary circuit and a control module. The power circuit is used for completing power conversion of a single-phase AC-DC. The auxiliary circuit is used for completing instantaneous detection of the input voltage, the input current and the output voltage, completing driving of an original PWM pulse, and outputting various detection values to the control module. After the control module receives the various detection values of the auxiliary circuit, the control module conducts digit arithmetic and logic processing on the basis of the principles of direct power control and double-loop control, finally, an original driving pulse is obtained, the original driving pulse is output to the power circuit after driving, on-off rules of a power device is controlled so as to enable the power circuit to complete correction of power factors, and the stable direct-current voltage is output. The single-phase AC-DC conversion circuit of the directional power achieves the single-phase AC-DC conversion of the network side unit power factors, and the single-phase AC-DC conversion circuit of the directional power has the advantages of being high in response speed, strong in anti-jamming capability and suitable for changes of loads within the wider range, and has load following features.

The invention provides a single-phase power factor corrector in direct network-side power control. The single-phase power factor corrector comprises a power circuit, an auxiliary circuit and a control module, wherein the power circuit is used for completing single-phase AC-DC (Alternating Current-Direct Current) power conversion; the auxiliary circuit is connected with the power circuit, and is used for completing the instant detection of input voltage, input current and output voltage and the driving of an original PWM (Pulse-Width Modulation) pulse and outputting measured electric quantity to the control module; and the control module is used for carrying out digital operation and logical processing according to direct power control and a single-period control principle after various detection electric quantities of the auxiliary circuit are received, obtaining an original driving pulse, and finally completing power factor correction by virtue of the power circuit and outputting stable DC voltage. According to the single-phase power factor corrector provided by the invention, the single-phase AC-DC conversion of a network-side unit power factor is realized, and the single-phase power factor corrector has the advantages of quick response speed, strong anti-jamming capacity, capability of adapting to load change in a wider range and load following characteristics, and is an ideal single-phase power factor correction scheme.

The invention discloses a method for processing a signal failure of a control sensor by using a dual-redundancy control rule, and is characterized by providing the method for processing the signal failure of the control sensor by using the dual-redundancy control rule, a dual-redundancy control rule design concept and a copy dual-redundancy control rule design principle, and a copy control rule design method and a design process of the dual-redundancy control rule. The main control rule is designed with the goal of enabling an aero-engine to obtain optimal thrust and economy in full flight envelope and ensuring the working stability and the structure strength of the engine; and the copy control rule design method provided by the invention is to perform the copy control rule design according to the copy control rule design principle on the basis that the main control rule design is finished. The method has the following advantages that the failure processing property of a digital control system is improved, the mission reliability of the aero-engine can be improved, the requirement of real-time control of the high-performance aero-engine is satisfied more easily, the method is more liable to implement, and the combination property of the aero-engine is improved.

The invention relates to a novel multi-layer structure of a rotor core. The novel multi-layer structure of the rotor core is formed by laminating punched silicon-steel sheets and embedding magnetic steel. During the design of a rotor, a double-layer structure is adopted, wherein the first layer comprises a piece of linear magnetic steel; and the second layer of magnetic steel has a V-shaped structure. Magnetic flux can be output to a largest extent by reasonably designing the length of the magnetic steel and distances between the respective magnetic steel, and the similarity of a counter potential wave form and a sine wave reaches 1.02 to 1.04. In a novel multi-layer embedded rotor sheet, on the basis of reserving the conventional advantages that a motor smoothly operates at a speed of 8,000 rpm, by the unique multi-layer structure of the rotor, the output of the magnetic flux of each electrode can be guaranteed to a largest extent, and the volume of the magnetic steel cannot be greatly increased.

One involves a gas delayed recoil method. This method is applied to: 1. Weapons with any caliber, chamber pressure and muzzle velocity can be launched with low recoil or recoilless. 2. Gas turbine engines, ramjet engines and rocket engines. As a combustion chamber subsystem, the working medium is changed from a constant pressure combustion mode to a constant volume combustion mode with higher thermal cycle efficiency. A piston is assembled in the barrel of the weapon (that is, the gun barrel or gun barrel). When the gunpowder gas in the barrel burns and expands to do work and launch the projectile, the piston is simultaneously pushed to move along the axis; when the "bore pressure-time curve" of the barrel Certainly, the special structural design of the piston allows the piston to move to the position of the exhaust hole opened on the barrel at the moment when the projectile exits the chamber, so that part of the gunpowder gas is ejected forward with the projectile and part of it is released. The gunpowder gas is ejected backward through this exhaust hole to form a recoil force to counteract the recoil momentum of the barrel.

The method to display time on mobile phone comprises: (1) once pressing the shut-down button, the system decides whether it is success to show time on power-saving mode; (2) if yes, system turns to power-saving mode, and keeps power supply as well as control circuit for processor and screen; (3) the clock circuit sends time data signal to the processor periodically; (4) the processor sends said signal to the control circuit; (5) it shows time on screen. Compared with normal state, this invention reduces power consumption effectively.

The invention belongs to the technical field of aircraft control and particularly relates to an autonomous parachute opening safety protection method and system for a small aircraft. A reliable safety protection algorithm is provided, the flight height, the flight attitude and system electric quantity are used as input variables, a gas generator detonation control command and a power source management command are used as output variables, meanwhile, the flight attitude and system electric quantity information affecting system safety work are taken into consideration, meanwhile, a denotation signal and power electricity are controlled, and safety is improved. The principle is simple, and no matter in the aspects of software implementation or hardware implementation, no obstacles exist. The system is simple in structure, easy to implement and low in cost. The threat caused by flight attitude unstability to flight safety is fully considered, the threat caused by too low electric quantity to flight safety is considered as well, meanwhile, damage possibly caused by an unfolded canopy to rotors is considered, and the effectiveness of the system is fully improved. The method and system have great market prospects and economic value.

The embodiment of the invention discloses a radio frequency front-end circuit and electronic equipment. The radio frequency front-end circuit comprises a transmitting module, a single-pole multi-throwswitch, a plurality of receiving modules and a plurality of antennas, the transmitting module is connected with the input end of the single-pole multi-throw switch, and a plurality of output ends ofthe single-pole multi-throw switch are respectively connected with the plurality of antennas in a one-to-one correspondence mode; and the plurality of receiving modules are respectively connected withthe plurality of antennas in a one-to-one correspondence manner. Method, based on one single-pole multi-throw switch, one or more signal transmitting paths in a communication network can be realized.According to the utility model, functions of a plurality of signal transmitting paths and a plurality of signal receiving paths are realized, and through the signal transmitting paths and the signalreceiving paths formed by the above structure, element difference loss caused by different elements can be improved, flexibility of circuit layout is increased, interference among radio frequency signals can be reduced, and path loss can be reduced.

The invention relates to a novel plastic cladding optical fiber in the fields of optical fiber communication, industrial control and optical fiber sensing. The novel plastic cladding optical fiber comprising a quartz core layer and a plastic ultraviolet cured clad is characterized in that the shear modulus of the plastic clad is not smaller than 150 Mpa; the thickness of the plastic clad is 10 Mum-20 Mum; the relative difference value Delta of the refractive index between the plastic clad and a pure quartz material is 2.5 percent-7.5 percent; the value of the numerical aperture NA of the optical fiber is 0.35-0.5; and the optical fiber can be used in a 850 nm window. The optical fiber has the advantages that the large numerical aperture and the low transmission loss enable the optical fiber to be applied in the short-distance and medium-distance data communications, the industrial control and the medical photoelectric products.

An object of the present invention is to make it possible that: a high-concentration hydrogel sheet, which is suitable for production of high-performance water-absorbent resin particles, is cut efficiently without involving the adhesion to such as cutting-blades; and the subsequent disintegration operation is also successfully carried out; and hydrogel particles excellent in the quality and performances are efficiently produced. As a means of achieving this object, the process according to the present invention for production of hydrogel particles is a process for production of the hydrogel particles 14 from a high-concentration hydrogel sheet 10 and comprises: a step (a) of cutting a continuous sheet 10 of a crosslinked high-concentration hydrogel polymer of 50 to 80 weight % in solid component concentration every 10 to 100 cm lengthwise of the continuous sheet 10 while running it lengthwise, thereby obtaining cut pieces 12; and a step (b) of continuously supplying the cut pieces 12 (obtained from the step (a)) to a continuous disintegrator 40 to continuously carry out disintegration and discharge under conditions where the supply amount of the cut pieces 12 and the disintegrating and discharging abilities of the continuous disintegrator 40 satisfy (supply amount) B29B 9 / 04 B29B 11 / 02 B26D 1 / 38 4 34 2 2004 / 9 / 1 1590057 2005 / 3 / 9 100404223 2008 / 7 / 23 2008 / 7 / 23 2008 / 7 / 23 Nippon Catalytic Chem Ind Japan Sasabe Masazumi Nogi Kozo Sakamoto Shigeru Fujita Yasuhiro Morita Akihiro Hattori Hiroaki zhu deqiang 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2003 / 9 / 1 2003-309138

The present invention discloses a nonlinear illumination adaptive image splicing method. The method comprises: calibrating a video camera, carrying out image acquisition on a cylindrical bearing by the video camera and expanding a cylindrical bearing image obtained by acquisition into a flat image; and carrying out median filtering on the flat image obtained after expansion, and carrying out nonlinear illumination adaptive image splicing on a bearing lateral surface image obtained after filtering so as to form a complete flat image without redundancies. According to the present invention, the factor of nonuniform illumination of an acquired object is considered; in the image splicing process, an illumination nonuniform compensating factor is introduced; introduction of the factor is beneficial for improving quality of image splicing and reducing the original feature of the image; and the nonlinear illumination adaptive image splicing method is simple to operate, is easy to understand and has a high computing speed.

A floating point divider includes a mantissa repetitive processing unit and an operation execution control unit. The mantissa repetitive processing unit calculates a quotient and a partial remainder by a digit-recurrence process for a mantissa of a dividend of an input operand. The operation execution control unit determines a bit value at a specified position uniquely specified based on a radix of an operation execution process with respect to the partial remainder. The mantissa repetitive processing unit reduces the number of digit-recurrence processes by calculating a quotient and a remainder based on a determining result of the operation execution control unit. The number of bits of the quotient is double of that of a quotient calculated once every the digit-recurrence process. The number of left-shift processes processed on the remainder is double of that of a remainder calculated once every the digit-recurrence process.

The invention provides a double-sweepback waverider design method of a fixed plane shape based on a projection method. The double-sweepback waverider generated by the method has waverider characteristics and high-attack-angle nonlinear lift force at a high speed, the lift force amplification is as high as 22.41% at a 20-degree attack angle, the lift-drag ratio reaches 7 at a low speed, a vortex wave effect is achieved to improve the lift-drag ratio, and the aerodynamic performance of a wide speed range is achieved.

The invention discloses a low-COD (Chemical Oxygen Demand) high-ammonia-nitrogen livestock wastewater treatment process, and belongs to the field of biological sewage treatment. The treatment process is divided into a pretreatment stage and a biochemical treatment stage specific to the characteristics of livestock wastewater quality. The treatment process comprises the following steps: firstly, removing large-particle suspended matters through a gradual screening tank and a primary sedimentation tank; homogenizing water quality and water amount in an adjusting tank, and adding wastewater into a dosing reaction tank; making the wastewater flow into a coagulating-precipitating tank in order to remove most suspended matters; added a NaOH solution into effluent for adjusting pH, introducing the effluent into an ammonia-nitrogen blow-off tower, adding hydrochloric acid into the effluent for adjusting pH to neutral, entering a secondary bio-contact oxidation process to remove most COD and deepen the ammonia-nitrogen removing effect; lastly, making the effluent flow through a secondary sedimentation tank to discharge the effluent up to standard. The low-COD high-ammonia-nitrogen livestock wastewater treatment process has a short route and high efficiency, sewage can be treated up to standard under the condition that a C / N ratio is close to 1 to 1, the problem that the effluent wastewater is difficult to reach standard is solved, and the aim of recycling the effluent is fulfilled.

The invention discloses a vehicle path tracking prediction controller and an FPGA heterogeneous acceleration implementation method, and belongs to the technical field of control. Vehicle system characteristics are learned by using a support vector machine, then a vehicle support vector machine model is established, the control for vehicle path tracking is realized based on model prediction control, and finally an FPGA heterogeneous acceleration method is carried out on the controller. Support vector machine model training is carried out on three selected vehicle state quantities respectively,each model training sample contains six inputs and one output, and the vehicle path tracking prediction controller is designed. A controlled design oriented vehicle model which is simple in structureand contains all information of a vehicle system can be obtained effectively, so that the controller meets all working condition requirements of the system; moreover, the computation speed of the vehicle path tracking prediction controller is improved, and the real-time requirement and low-cost computation and storage requirements of the system are met; and moreover, a control algorithm is convenient to transplant between software and hardware, so that the difficulty of system development is reduced greatly.

The invention discloses a coated antenna device. The coated antenna device comprises a circular polarization radiation paster, impedance conversion lines, a micro-strip feeder line, a dielectric substrate, an earth plate and a frequency selective surface coating. The circular polarization radiation paster is arranged in the center of the upper surface of the dielectric substrate in an etching mode and connected with the micro-strip feeder line through the impedance conversion lines. The earth plate is arranged on the lower surface of the dielectric substrate in an etching mode, and the frequency selective surface coating is located over the circular polarization radiation paster. The length of the edge of the square circular polarization radiation paster ranges from 13 mm to 15.5 mm, the paster is connected with the two impedance conversion lines, and the joints of the paster and the two impedance conversion lines are located on the different edges of the paster. Sixty-four square metal units are arranged on the lower surface of the frequency selective surface coating in an etching mode and are evenly distributed in an 8*8 array mode, and the area of the square metal units in each line gradually becomes small. According to the coated antenna device, the gain of an antenna can be improved, the sidelobe of the antenna can be reduced, and the performance of the antenna can be improved.

The application discloses an air suspension blower motor cooling structure and cooling method. The air suspension blower motor cooling structure comprises an air suspension blower main body and a support assembly; the air suspension blower main body is installed on the support assembly, the air suspension blower main body comprises a motor shell, a heat dissipation volute, a stator and a rotor, wherein the rotor is rotatably installed in the motor shell through an air suspension bearing; the stator is provided with a plurality of heat dissipation grooves, the stator is installed on the inner wall of the motor shell, a first airflow channel is formed between the stator and the inner wall of the motor shell, and a second airflow channel is formed between the stator and the rotor. The supportassembly comprises a bottom support, a support block, angle iron and a connecting block, wherein the support block is installed on the upper portion of the bottom support through bolts, the angle iron is installed on the upper portion of the support block through bolts, one side of the connecting block is installed on the side wall of the angle iron through bolts, and the upper end of the connecting block is fixedly connected with the bottom of the motor shell through bolts. According to the scheme, the heat dissipation efficiency of the motor can be effectively improved under the condition that the machining difficulty of the motor is not increased.

The invention relates to a multi-level direct current transformation power supply device. The multi-level direct current transformation power supply device is characterized by comprising a super capacitor, a circuit switching unit, a multi-level voltage converter unit and a voltage monitoring unit, wherein the total output of the super capacitor is connected with the multi-level voltage converter unit through the circuit switching unit, the multi-level voltage converter unit is connected with a load, the voltage monitoring unit is connected with the output end of the super capacitor and the circuit switching unit and is used for detecting the output voltage of the super capacitor and controlling the motion of the switching unit of a control circuit. The multi-level direct current transformation power supply device provided by the invention adopts a multi-level direct current transformation device, the input voltage can be input in the rang of 50-270 V at will, the stableness and non-interval output of voltage are realized, and stability and reliability are improved; and the multi-level direct current transformation power supply device meets power source requirements of intelligent transformer substations, especially power supply backup decay of a movement intelligent transformer substation, an intelligent on-off action and background monitoring; and the structure is simple, and the service life is long.

The invention discloses a method for obtaining inherent frequency of a Coriolis flowmeter, and relates to the field of signal processing. The method comprises the following steps: obtaining a sampling signal based on a vibration signal of the Coriolis flowmeter in a free attenuation state, truncating the sampling signal to obtain a truncated signal, and performing fast Fourier transform on the truncated signal to obtain an inherent frequency of the Coriolis flowmeter; obtaining an index of a frequency spectrum maximum value of the truncated signal; carrying out two-point interpolation calculation on the frequency spectrums of the truncated signal and the sampling signal in sequence to obtain a sampling signal frequency spectrum offset and an attenuation factor preliminary estimation value so as to obtain an initial parameter of a noise reduction filter; constructing a prediction relational expression by using the linear prediction property of the sinusoidal signal, and further inhibiting the influence of noise through a noise reduction filter to obtain a prediction matrix after noise reduction; and solving the matrix to obtain a prediction coefficient so as to obtain the inherent frequency of the Coriolis flowmeter. According to the method, the Coriolis flowmeter inherent frequency estimation precision can be improved, the calculated amount is reduced, and the inherent frequency obtaining speed is increased.