48results about How to "Solve the problem of dead zone" patented technology

The invention discloses a method for judging and positioning a distributed traveling wave fault of a power transmission line, and relates to the technical field of power transmission line fault positioning. The method comprises the following steps: S1, arranging n groups of detection devices on M and N buses of a transformer substation and on an overhead transmission line; S2, detecting and reading the current information of each group of detection devices; S3, carrying out the phase-mode conversion of a three-phase fault current traveling wave; S4, carrying out the zero-crossing recognition of the voltage of a fault point at a fault moment; S5, selecting a wavelet transformation algorithm or a bisection SVD algorithm according to the results of step S4; S6, determining a fault section and calculating the speed of the traveling wave and a fault distance according to the header information of the fault traveling wave. The method solves problems that the fault distance cannot be accurately determined under the condition that a fault happens nearby a voltage zero-crossing point when a system independently employs the wavelet transformation algorithm, the data processing efficiency is low and the operational amount is large when the system independently employs the bisection SVD algorithm.

The invention discloses a bridgeless PFC (Power Factor Correction) converter working in a Buck mode or a Buck-Boost mode. The bridgeless PFC converter comprises a first switch tube, a second switch tube, a third switch tube, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, an inductor and a capacitor. When an absolute value of input voltage is greater than output voltage, the converter works in the Buck mode; and when the absolute value of the input voltage is less than the output voltage, the converter works in the Buck-Boost mode. Since the Buck-Boost working mode is added, the converter solves the problem that a Buck PFC converter has a dead zone inherently, and the power factor of the converter can be effectively increased.

An embodiment of the invention discloses a direct adaptive control method and a direct adaptive control device. The direct adaptive control method in the embodiment of the invention includes building dead zone and fault nonlinearity dynamic models according to dead zones and fault nonlinearity in control systems; constructing inverse functions of the dead zones and compensating the dead zone and fault nonlinearity dynamic models; compensating compensation errors and fault nonlinearity kinetic models in executors in the dead zones. The compensation errors are generated due to dead zone inverse compensation processes. The direct adaptive control method and the direct adaptive control device have the advantages that the technical problem of dead zones and fault nonlinearity in nonlinear systems can be solved, nonlinearity can be effectively compensated, and the operation stability and the excellent tracking performance of the systems can be ultimately guaranteed.

The invention discloses a double-disturbance MPPT control method of a photovoltaic power generation system. A switch capacitor converter is employed as a control circuit of MPPT, and is composed of two switch capacitor units SC1 and SC2 and a direct current filter. A double-disturbance P&O algorithm is provided on this basis, the SC1 and the SC2 employ a variable step size algorithm, different speed factors are selected, a bidirectional complementation control mode is formed, namely, only reverse disturbance can be carried out after one enters a dead zone, forward disturbance is completed by the other one. Through the control mode, the disturbance convergence speed is raised, the dead zone problem is solved, starting can be carried out rapidly and stably, misjudgement is reduced, the oscillation phenomenon of a system output power in the maximum power point can be reduced effectively, and energy loss of a photovoltaic module is reduced.

The invention relates to a two-phase variable frequency power source and an output method of the two-phase variable frequency power source. The two-phase variable frequency power source comprises power supply input ends L1 and L2 and a power supply circuit. The two-phase variable frequency power source is characterized in that an H bridge inverter circuit I, an H bridge inverter circuit II and a control unit are respectively connected at the power supply input ends; the control unit is provided with pulse signal output ends A and B; pulse signals A and B that are adjustable in frequency are output by the control unit, and the half-wave diagonal drive of the H bridge inverter circuits I and II is realized under the action of an electronic reversing signal controlled by the control unit; the pulse signals A and B are same, but the pulse signal B lags behind the pulse signal A by 0-180 degrees in time sequence. The H bridge inverter circuits I and II work independently and a two-phase variable frequency power source signal is output at the output ends of the inverter circuit I and the H bridge inverter circuit II. The two-phase variable frequency power source has the advantages of simplicity in structure, stability in operation, high reliability and low cost, and can meet demands of industrial and civil occasions.

The invention, which belongs to the field of laser ranging, discloses a three-dimensional coordinate measuring system and measuring method for an object surface. The system comprises a laser ranging device, a two-dimensional displacement platform and a processor. The laser ranging device includes a light source, an optical isolator, an F-P filter, a spectrograph, a first coupler, a second coupler,a first reference arm, a second reference arm, and a measuring arm. A fixed optical path difference is formed between the first and second reference arms. The optical isolator is arranged a light emitting direction of the light source. The spectrograph is connected with the processor. The processor is used for analyzing and processing interference signals between laser returned by the measuring arm, the first reference arm, and the second reference arm to obtain the depth of a to-be-measured object in a Z axis direction. Besides, a three-dimensional coordinate of the to-be-measured object isgenerated by combining coordinates, reflected by the two-dimensional displacement platform, of the to-be-measured object on X and Y planes. In addition, the invention also provides a three-dimensionalcoordinate measuring method for an object surface. The method and device are simple and the cost is low; a dead zone problem is solved; and high-precision and large-breadth measurement is realized.

The invention discloses femtosecond laser closed-loop processing system and method, and belongs to the field of femtosecond laser processing. The system comprises a femtosecond processing system, a femtosecond range-measurement system, a three-dimensional movement platform and a processor. The processing system and the range-measurement system share a part of components. The femtosecond processingsystem comprises a femtosecond laser, an opto-isolator, a first beam splitter and a microscope objective. The femtosecond range-measurement system comprises a femtosecond laser, an opto-isolator, a first beam splitter, a second beam splitter, a microscope objective, a first reference arm, a second reference arm, a coupling lens, an F-P filter and a spectrograph. An object to be processed is placed on the three-dimensional movement platform, and the processor controls the movement of the movement platform and analyzes information acquired by the spectrograph in the femtosecond range-measurement system, so that the height information of an object processing point is acquired and is further fed back to the femtosecond processing system, and closed-loop control is formed. The invention further provides the corresponding processing method. According to the system and the method provided by the invention can realize high-precision on-line feedback processing on workpieces.

The invention provides an automotive active suspension control method with a dead-zone executer, which relates to automotive active suspension control methods. The invention is the automotive active suspension control method with the dead-zone executer, which is to solve problems that the prior art cannot meet requirements of keeping comfort under uneven pavement conditions and the lowering of the actual performance is not taken into consideration in the controller designing process of the prior art. The method comprises the following steps of step 1, establishing a mathematical model of a dead zone of the executer in an active suspension system; step 2, establishing a 1 / 4 automotive active suspension module with a dead-zone characteristic executer; step 3, designing a dead-zone compensating controller by means of the 1 / 4 automotive active suspension module with the dead-zone characteristic executer; step 4, verifying a closed-loop system, in which the dead-zone compensating controller is introduced into the 1 / 4 automotive active suspension system, by using an Lyapunoy function; and the like. The automotive active suspension control method with the dead-zone executer, provided by the invention, is applied to the control field of automotive active suspensions.

The invention relates to a pyroelectric sensor comprising a housing and a pyroelectric member. When the pyroelectric member detects a biont heat source, a human signal is output. The housing is provided with at least three sets of Fresnel Lenses, the optical axes of the Fresnel Lenses intersect at an optical axis intersection point, and each optical axis is a straight line where the line connecting the central point of the Fresnel Lens and the light spot is arranged. The detection precision is improved and the dead zone problem is solved, the service life is prolonged, and the detecting effect is enhanced.

The invention discloses a device and method for treating high-concentration NO3-N wastewater or urban sewage by adopting an improved DEAMOX continuous flow process. Short-process denitrifying granular sludge having good sedimentation performance and anaerobic ammonia oxidized granular sludge are put into a reactor, an oxygen-poor stirring strengthening substrate is added in the continuous flow reactor for mass transfer, and the problem of the poor denitrification effect caused by channeling and dead zone phenomena of a traditional continuous flow reactor is solved. Short-process denitrifying bacteria utilize organic matter and an external carbon source in urban sewage to convert NO3-N into NO2-N, then synchronous removal is performed through anaerobic ammonia oxidation reaction and NH4+-N in the urban sewage, and efficient removal of nitrogen is achieved by optimizing the flow of high-NO3-N-content wastewater, the urban sewage and the carbon source in inflow water. The device is high in nitrogen removal rate and nitrogen removal load, simple in structure and easy to optimize and control, the problem of difficult treatment of the high-NO3-N-content wastewater can be effectively solved, and the purpose of synchronous urban sewage treatment is achieved.

The invention relates to a drive circuit of a synchronous rectification DC / DC (Direct Current / Direct Current) convertor. The drive circuit and a switch level commonly form the synchronous rectification DC / DC convertor, wherein the switch level comprises a main switch tube, a synchronous rectifier tube, a PWM (Pulse-Width Modulation) controller, an inductance L, a capacitance C and a resistance R; the drive circuit comprises a main switch tube drive module and a synchronous rectifier tube drive module; an output signal PG of the main switch tube drive module is connected with a grid electrode of the main switch tube, and is connected to one input end of the synchronous rectifier tube drive module; one input end of the main switch tube drive module is connected with a PD signal output end of the PWM controller; an output signal NG of the synchronous rectifier tube drive module is connected with a grid electrode of the synchronous rectifier tube and is connected to the other input end of the main switch tube drive module; and the other input end of the synchronous rectifier tube drive module is connected with an ND signal output end of the PWM controller.

The invention discloses a single-polarity-controlled three-phase two-level inverter space voltage vector modulation algorithm. The algorithm is characterized in that a carrier triangular wave or a sawtooth wave controlled by a single polarity and a group of modulation waves expressed by a piecewise function are used, and an on-off signal is transmitted from an intersection point of the carrier wave and the modulation wave so as to realize the three-phase two-level inverter space voltage vector modulation. By adopting the algorithm, not only the same modulation effect with the conventional three-phase two-level inverter space voltage vector modulation algorithm SVPWM be realized, such as the voltage utilization rate is high, and a circular magnetic chain is generated, but also no dead-corner protection requirement is needed, the waveform distortion problem can be avoided, the on-off times can be half reduced, and the algorithm has the advantage that the on-off loss is small.

A femtosecond laser distance measuring device comprises a first reference light path, a second reference light path and a measuring light path. The first reference light path and the second reference light path have the fixed optical path difference and are each provided with a shutter. The shutters are used for switching the reference light paths in the distance measuring process so as to use the corresponding reference light for measurement. A femtosecond laser distance measuring method comprises the steps that dead zone ranges are set for interference signals of first reference light and second reference light; in the data collection process, when the interference signals of measuring light enter the dead zone range of the reference light in use, the shutter corresponding to the reference light path is controlled to be closed, and the shutter corresponding to the other reference light path is opened; when the measured object distance is calculated, the fixed optical path difference is used for compensating the measuring distance difference caused by switching of the two reference light paths. The dead zone problem existing in femtosecond laser distance measuring can be effectively solved.

The invention relates to an inclinometer for similar rotary transformers. The inclinometer comprises a sensitive structure and a shell, wherein the sensitive structure comprises a first reception polar plate, an emission polar plate and a second reception polar plate; the first reception polar plate, the emission polar plate and the second reception polar plate are alternately stacked in sequenceto form a sandwich-like structure which is placed in the shell; the first reception polar plate, the emission polar plate and the second reception polar plate are the same in the aspect of size and the distances between every two adjacent polar plates are the same; the first reception polar plate, the second reception polar plate and the shell form an enclosed cylindrical space; dielectric liquidis sealed in the enclosed cylindrical space; and under any angle, the liquid level of the dielectric liquid is coincided with the centers of the three polar plates. The invention discloses a variable-electrode area differential capacitive inclination sensitive device structure which is high in sensitivity, wide in dynamic range, good in frequency response characteristic and low in cost and can bewidely applied in inclination sensing and test instrument measurement in the field of test.

The invention relates to a high-speed phase detector, in particular to a high-speed phase detector based on the single-phase-clock dynamic CMOS technology, belonging to the technical field of signal processing and the circuit thereof. Based on the traditional phase detector, a time delay module is added to a feedback loop, so that no dead zone exists when the phase detector is in operation; and ahigh speed D trigger is used for replacing the traditional low speed D trigger, thereby causing the working speed of the phase detector to reach 900 MHz. The phase detector has the advantages of highworking speed, easy manufacture, and no dead zone during the operation, and is especially suitable for precisely differentiating the phase difference of two input signals in a delay-locked loop.

The method is implemented through following procedures. First, current signals in each phase are measured, and analog current signals are converted to digital signals. Next, based on direction of current, computer program determines power device is valid or invalid. Then, normal driving signals not containing dead region are sent to valid components, and non-signal is sent to invalid components. Thus, issue of dead region is avoided. Performances of PWM unit are improved. The method does not need to do calculation, and does need to send out driving signals based on determination of current direction. The method provides features of simple, reliable, easy of implementation, lowered switching loss and increased efficiency of inverter.

The invention discloses a dead zone overcoming system and method of a closed-loop fiber-optic gyroscope, and belongs to the technical field of fiber-optic gyroscopes. The closed-loop fiber-optic gyroscope comprises a wide-spectrum light source, a coupler, a Y waveguide integrated optical chip, an optical fiber sensing ring, a photoelectric detector and a signal processing circuit, wherein the signal processing circuit comprises a forward amplification circuit, an A / D module, an FPGA digital logic circuit, a D / A module and a driving circuit. When the gyroscope enters a dead zone, due to the fact that a DAC register of the system is switched between two square wave modulation states, two kinds of square wave pulses with different amplitudes can be counted in the DAC register to determine a measured bias error. The determined crosstalk error signal is fed back to the modulation voltage for error compensation, the influence caused by signal crosstalk is eliminated, the gyroscope works in a complete closed loop, and the problem that the rate register is zero at the moment is corrected, so that the numerical value in the rate register is equal to the real input, and the dead zone problem is solved.

The invention relates to a high-speed phase detector, in particular to a high-speed phase detector based on the single-phase-clock dynamic CMOS technology, belonging to the technical field of signal processing and the circuit thereof. Based on the traditional phase detector, a time delay module is added to a feedback loop, so that no dead zone exists when the phase detector is in operation; and a high speed D trigger is used for replacing the traditional low speed D trigger, thereby causing the working speed of the phase detector to reach 900 MHz. The phase detector has the advantages of high working speed, easy manufacture, and no dead zone during the operation, and is especially suitable for precisely differentiating the phase difference of two input signals in a delay-locked loop.

The invention discloses a preparation method of an aluminum-based composite material reinforced by particles through uniform dispersion. The preparation method includes the following specific steps that a metal Al-Si alloy is added in a graphite crucible, and the alloy is made to be in the molten state by conducting electromagnetic inducting heating through electromagnetic field generation devices; and the reinforcing particles accounting for 4.5%-5.5% of the volume of the molten alloy are taken, preheated to 300 DEG C and slowly added in the molten alloy, the reinforcing particles and the molten alloy are mixed under cooperative stirring of a mechanical stirrer and the electromagnetic field generation devices, the temperature of the alloy is kept within the eutectic area of the Al-Si alloy by controlling the intensity of electromagnetic fields, part of Si crystal particles are separated out, Si crystals which are separated out are sufficiently mixed with the reinforcing particles under the synergistic effect of mechanical and electromagnetic stirring, reinforcing particle clusters are broken, and therefore the reinforcing particles can be evenly dispersed in an alloy substrate. Bymeans of the preparation method, the problem that because mechanical stirring is independently used, dead zones in a melt are caused is solved, and meanwhile the phenomenon that because electromagnetic stirring is independently used, the reinforcing particles are gathered on the surface of the alloy substrate is also avoided.

A mobile robot motion control system based on a QT human-machine interaction interface and a motor servo system relates to a mobile robot platform and solves the problem that a conventional application rotor is uneasy to integrate, poor in universality and control performance, and is uneasy to debug during a failure or trial period because of closed overall structure. A motor feedback circuit is used for acquiring the pulse signal of a driving wheel of the robot, measuring the pulse frequency of the pulse signal, and transmits the pulse frequency to a controller. A motor driving module drivesthe driving motor of the driving wheel of the robot to rotates according to a motor control signal issued by the controller. A gyroscope acquires the angular acceleration data of the mobile robot andsends the same to the controller. The controller and a host computer realize data interaction. A motor control unit in the controller is used for acquiring the current pulse frequency sent by the motor feedback circuit of the corresponding driving wheel and obtains the motor control signal by PID operation according to the current pulse frequency and a preset signal of the motor.

The invention provides an area array sweep frequency measurement device and method, and belongs to the technical field of laser ranging, and the device comprises a tunable laser, a first collimator, a first beam expander, a first beam splitter, a lens, a reflection element, a camera, and an acquisition control unit. The tunable laser is used for controlling the camera to acquire an interference image by sending a trigger signal and providing an original light beam; the first beam splitter is used for splitting the collimated and expanded light beam into a first light beam and a second light beam, and the first light beam irradiates a to-be-measured object and then is reflected; the reflection element is used for reflecting the second light beam to form reference light; and the camera is used for collecting an interference image formed by interference of the first reflected light and the reference light. According to the invention, a traditional point detection acquisition mode is replaced to acquire the surface topography, mechanical scanning errors introduced during point detection are avoided, and the measurement accuracy in a general field of view is improved.

The invention discloses an integrated narrow-frame photoelectric detector and a manufacturing method thereof, which can be used in the fields of low-light detection, particle detection, nuclear radiation detection and the like, and solve the problems that in the prior art, the effective detection area ratio is difficult to increase by a circular structure of a vacuum photoelectric detector; and a micro-channel plate electron multiplier assembly adopts welding, and an insulating spacer is too thin, so that the insulativity becomes poor. The integrated narrow-frame photoelectric detector comprises a cathode window, a photoelectric cathode, a micro-channel plate electron multiplier, an insulating tube shell, a charge collection anode, an electrode lead and an indium sealing groove. Meanwhile, the invention further provides a manufacturing method of the integrated narrow-frame photoelectric detector, and the integrated narrow-frame photoelectric detector has the advantages of being high in detection efficiency, large in effective detection area ratio and compact in structure, being easy to process and manufacture and the like.

The invention discloses a UPS bypass driving unit, which comprises a DSP control module, a bypass driving enabling module, a DSP operation detection module and a bypass driving module, wherein the DSPcontrol module is used for sending a first control signal to the bypass driving enabling module and sending a second control signal to the DSP operation detection module; the bypass driving enablingmodule is used for sending a driving starting enabling signal to the bypass driving module when receiving the first control signal; the DSP operation detection module is used for sending a DSP abnormal enabling signal to the bypass driving module when detecting that the second control signal is abnormal; and the bypass driving module is used for forming a driving signal for starting bypass outputand stopping inversion output at the output end of the bypass driving module when receiving the driving starting enabling signal and the DSP abnormal enabling signal. The invention further discloses aUPS bypass driving system. The UPS bypass driving system comprises more than two UPS bypass driving units and a parallel operation switch control module. The UPS bypass driving unit is used for stably switching to a bypass output state in case of an operation fault so as to reliably supply power.

The invention relates to a configurable frequency synthesis circuit based on a delay locked loop. The circuit comprises the delay locked loop, a frequency synthesizer and a configuring SRAM, wherein, the delay locked loop consists of a phase discriminator, a controller and a variable delay chain; and the frequency synthesizer consists of a frequency doubling synthesizer and a frequency division synthesizer. The phase discriminator receives a reference clock and a feedback clock and outputs comparison signals and locking signals after phase demodulation comparison; the comparison signals and the locking signals are processed by the controller, and the controller outputs control voltage then in order to enable the variable delay chain to generate N phase clocks that are output to the frequency synthesizer; and the frequency doubling synthesizer and the frequency division synthesizer enable the set / reset time of a R / S trigger in the frequency doubling synthesizer to generate frequency doubling clock signals under the control of the configuring SRAM, and lead the set / reset time of the R / S trigger in the frequency division synthesizer to generate frequency division clock signals. The configurable frequency synthesis circuit has simple circuit organization, flexibly changes a frequency synthesis coefficient by changing the code flow value in the embedded configuring SRAM so as to obtain a frequency division coefficient and a frequency doubling coefficient as required, and can be applied to a field programmable logic array.

The invention provides a tool tray for an automobile electronic controller, and the tool tray can effectively solve the problem that dead zones and blind zones exist in the assembling process. The tool tray for the automobile electronic controller comprises a base, the base is provided with a straight slot, and supporting seats are fixed to the positions, at the two ends of the straight slot, on the base; a rotary table is connected between the supporting seats through shafts, and a rotating device is fixed to the positions, at the ends of the outer sides of the supporting seats, on the base; the rotating device comprises a shell, the shell is internally provided with a turnplate, and the turnplate is in coaxial connection with the rotary table; and the outer circle face of the turnplate is provided with through holes at intervals, and a bolt penetrates through a trepanning slot in the shell to be inserted into the through holes.