392 results about "Pulse current" patented technology

According to the cable multi-parameter fusion sensor and method, in the cable multi-parameter fusion sensor, a shielding shell is of an open-close type metal annular structure; the zero-flux sensor module is arranged on the inner layer of the shielding shell so as to detect a cable sheath ring current signal; the pulse current sensor module is arranged on the outer side of the zero-flux sensor module so as to detect a cable partial discharge pulse current signal and an overvoltage impact current signal; the magnetic shielding layer is arranged between the zero-flux sensor module and the pulse current sensor module to shield low-frequency magnetic field interference; the zero magnetic flux sensor module and the pulse current sensor module share the shielding shell to form an electromagnetic shielding structure.

The invention relates to the technical field of intelligent control, and discloses an ultra-low power consumption miniature LED visible light intensity self-adaptive regulation and control method and system, and the method comprises the steps: obtaining an analog light intensity signal, and carrying out the smoothing processing of the analog light intensity signal, and obtaining an environment light intensity value; calculating a light intensity change rate, and if the light intensity change rate exceeds a dynamic threshold value, marking an environment state and outputting a light intensity difference value; generating a preliminary adjustment instruction according to the state matching control parameter and the difference value quantization mapping, and calculating target light intensity in combination with the basic brightness; after executing the instruction, calculating actual and target deviation, and iteratively correcting to obtain a light intensity control signal; if the power consumption exceeds the limit, optimizing the signal amplitude; the input driving circuit analyzes the synthesized pulse current, excites pixels to emit light and gathers to obtain adjustment data; and if the visual contrast is lower than a threshold value, the change rate is adjusted again to realize closed-loop refining, and the light intensity adjustment accuracy is improved. The method can improve the real-time sensing capability of ambient light.

The invention is suitable for the technical field of grounding grid defect evaluation, and provides a transient electromagnetism-based grounding grid corrosion defect evaluation method and system, and the method comprises the steps: placing a sensor of a transient electromagnetic detection device above a to-be-detected region of a grounding grid, injecting a pulse current excitation signal into a conical focusing excitation coil, and carrying out the detection of the to-be-detected region of the grounding grid; acquiring an induced voltage time sequence signal through a receiving coil; extracting at least one characteristic parameter from the induced voltage time sequence signal, wherein the characteristic parameter comprises a signal peak value, peak value time, an attenuation rate or a signal integral quantity; inputting the characteristic parameters into a preset corrosion evaluation model, and performing inversion to obtain a residual thickness value or a corrosion depth value of the grounding grid in the to-be-detected area; generating and outputting a quantitative evaluation result containing the residual thickness value or the corrosion depth value; the method can be implemented in a non-stop state of the grounding grid, and an efficient and reliable decision basis is provided for safe operation and state maintenance of a power system.

The invention belongs to the technical field of equipment state monitoring and fault diagnosis, and relates to a pole-mounted switch damp defect diagnosis method and system based on multi-source information fusion, and the method comprises the steps: collecting a leakage current signal and a high-frequency pulse current signal flowing through a grounding wire in real time, and environment parameters around a target pole-mounted switch; preprocessing the leakage current signal and the high-frequency pulse current signal, and performing feature extraction based on the preprocessed leakage current signal, the preprocessed high-frequency pulse current signal and environmental parameters to obtain a leakage current feature quantity, a high-frequency discharge feature quantity and an environmental coupling factor; and based on the leakage current characteristic quantity, the high-frequency discharge characteristic quantity and the environment coupling factor, judging a damp fault of the target pole-mounted switch, and combining a D-S evidence theory and fusing multi-source information confidence to complete damp defect diagnosis of the target pole-mounted switch. According to the invention, complementarity between different information sources can be fully utilized, and the damp state of the pole-mounted switch can be accurately judged.

The invention relates to a 10kV switch cabinet intelligent automatic operation monitoring and early warning method and system and a medium, and the method specifically comprises the following steps: 1, collecting the partial discharge data information of each key part, including a sound wave signal, an instantaneous pulse current signal and a high-frequency electromagnetic wave signal; 2, carrying out data processing, and obtaining a partial discharge abnormal point data value of each key part; 3, realizing partial discharge early warning of the switch cabinet by adopting a fault early warning method based on current and sound wave abnormal point data of the switch cabinet; 4, collecting the temperature of each key part and the environment temperature; 5, carrying out data processing, and obtaining a change relation function of the temperature rise of each key part along with the current; step 6, establishing a switch cabinet dynamic early warning model to realize dynamic temperature rise early warning; the method has the advantages that the operation and maintenance cost is reduced, the equipment operation efficiency is improved, potential safety hazards are found in time, and remote monitoring and early warning are achieved.

According to the vehicle battery heating control method and device, the electronic equipment and the storage medium provided by the embodiment of the invention, the actual battery temperature and the actual pulse current value of the vehicle battery are monitored in real time in the process of circularly generating the pulse current between the vehicle battery and the three-phase winding of the motor; updating pulse signal parameters based on the actual battery temperature, the actual pulse current value and a preset current upper limit value, wherein the pulse signal parameters comprise a pulse beat and a pulse amplitude; and on the basis of the updated pulse signal parameters, the three-phase bridge arm is controlled to be circularly switched on and switched off, so that new pulse current is circularly generated between the vehicle battery and the three-phase winding of the motor. The battery temperature and pulse current are monitored in real time, pulse signal parameters are dynamically updated, fed back and corrected, accurate and efficient heating of the vehicle battery is achieved, meanwhile, the safety of the heating process is guaranteed through current upper limit control, and the heating efficiency and the system stability are both considered.

The invention relates to the technical field of geophysical exploration, in particular to a semi-aviation transient electromagnetic detection system based on cooperation of a robot dog and an unmanned aerial vehicle, and the system consists of a robot dog platform, an unmanned aerial vehicle platform and a ground control station. The robot dog platform comprises a high-power transient electromagnetic transmitter, a line source laying module, a voice warning module and a mobile positioning module, and can automatically lay a line source and inject pulse current to the ground; the unmanned aerial vehicle platform comprises a visual field auxiliary module, a flight driving module and a receiving coil, and the coil can be dragged according to a preset route to collect electromagnetic data; the ground control station is used for job scheduling and data processing. Wiring-transmitting-receiving integrated collaborative operation is realized through the robot dog and the unmanned aerial vehicle, and the robot is suitable for detection of a complex mountain environment.

The invention relates to a metal component defect depth detection system and method based on sweep frequency pulsed eddy current. The system comprises a pulse eddy current probe module, a pulse signal excitation module, a current amplification module, a voltage amplification module, a band-pass filtering module and a signal acquisition module. The pulsed eddy current probe module comprises an excitation probe and a receiving probe which are respectively used for transmitting excitation signal pulsed eddy current and receiving sampling data; the pulse signal excitation module is connected with the upper computer module and the current amplification module, and is used for receiving the control command and exciting pulse signal current to control probe detection; the current amplification module is used for amplifying the pulse current; the voltage amplification module is connected with the receiving probe and the band-pass filtering module and is used for amplifying the induced voltage; the band-pass filtering module is used for frequency screening; and the signal acquisition module is responsible for performing format conversion on the sampling data and uploading the sampling data to an upper computer. The system can realize excitation and signal acquisition for different depth areas, and accurately determine the characteristic frequency of defect depth.

A by-product deposit removal device is provided that can enhance the effect of removing by-product deposits that occur on the electrodes of a storage battery. [Solution] The by-product deposit removal device includes an electrode connection part connected to the electrodes of a storage battery, and a removal signal generation part that generates a by-product deposit removal signal using current extracted from the electrodes of the storage battery via the electrode connection part. The removal signal consists of a periodic pulse current, and when the amplitude value of the rising edge of a single pulse current waveform of the removal signal is H1 and the amplitude value of the undershoot after the falling edge of the pulse current waveform is H2, H2 is 0.2 to 1.0 times H1. Furthermore, when the time width of the rising edge of the pulse current waveform is T1 and the time width of the falling edge accompanied by an undershoot is T2, T2 is 0.02 to 0.2 times T1.

The invention relates to the technical field of graphene inspection, in particular to a graphene heating film inspection system, which comprises a pulse excitation and anomaly detection unit for applying pulse current excitation to a graphene heating film, synchronously acquiring acoustic emission signals and extracting abnormal coordinate points of which acoustic energy peak values exceed an abnormal threshold value; the fixed-point load and frequency shift monitoring unit is used for applying a continuous current load at the abnormal coordinate point, monitoring the sound emission main frequency migration volume in real time and generating a frequency shift rate curve; and the risk inspection unit is used for calculating a defect expansion risk level according to a critical time value corresponding to an inflection point in the frequency shift rate curve. According to the method, the defect expansion speed and the change trend thereof can be continuously tracked, a continuous quantitative index is provided for judging the defect stability and activation trend, and the interpretability and predictability of the micro evolution process are improved.

The invention discloses a gear micro-texture current-assisted laser processing method and device. The method comprises the steps that a gear three-dimensional model is established, and a curved surface processing path is generated; a laser is controlled to emit laser, the gear space attitude is adjusted, a dynamic focus lens is controlled to adjust the focal length of a laser beam based on a curved surface machining path, an X-direction galvanometer and a Y-direction galvanometer are controlled to adjust the direction and angle of the laser beam, and a laser spot is focused on a to-be-machined area of the gear; meanwhile, high-frequency pulse current is applied to the to-be-machined area, and the current waveform is sine wave; and high-pressure airflow is jetted. The laser energy absorption rate of the gear surface is increased, the temperature field is homogenized, and the plasma shielding effect is weakened, so that the integrity and uniformity of the texture contour are improved, splashing and burrs are reduced, and the machining quality and efficiency are improved. And machining is suitable for the complex curved surface of the gear, high-precision and high-consistency micro-texture machining is achieved, and the requirements for lubrication, friction reduction and fatigue resistance of a high-end gear are met.

The invention discloses an embedded electromagnetic actuating array flexible robot system based on pulse driving and a preparation method of the embedded electromagnetic actuating array flexible robot system, and belongs to the technical field of flexible robots. The system comprises a flexible actuating body, a multi-channel pulse driving controller, a sensing unit and a processing unit. A conductive coil array capable of independently addressing is embedded in the body, and magnetic particles are dispersed in the material of the conductive coil array. The driving controller can output independent programmable pulse current to each coil, a pulsed magnetic field is excited around the coils, the magnetic field interacts with the magnetic particles, electromagnetic force and magnetic torque are generated in the flexible body, and therefore the body is driven to generate controllable deformation. The sensing unit monitors the deformation or stress state of the body in real time, the processing unit dynamically adjusts pulse parameters according to target deformation and sensing feedback, and precise closed-loop control is achieved. According to the system, a space-time division multiplexing strategy is adopted to coordinate multi-channel excitation, and magnetic field crosstalk is effectively inhibited; and efficient thermal management is realized through combination of a low-duty-ratio pulse working mode and a high-thermal-conductivity base material. The device has the advantages of being fast in deformation response, large in output force, high in programmable degree, accurate in control and the like, and has wide application prospects in the fields of soft robots, self-adaptive grippers, bionic motion platforms, medical instruments, man-machine interaction equipment and the like.

The invention relates to the technical field of power equipment detection, and discloses a GIS foreign matter recognition and positioning method and system based on a multi-sensing double-order fusion network, and the method comprises the steps: synchronously collecting ultrahigh frequency, ultrasonic wave and pulse current signals of GIS partial discharge through a multi-mode sensor, and constructing a discharge pulse correlation octree after clock synchronization and adaptive noise reduction; foreign matter recognition is completed by means of feature-level and decision-level dual-order fusion, and accurate positioning of a discharge source is achieved by combining initial positioning of a time difference method and bisecting face iteration. And furthermore, the foreign matter motion trail is restored, the discharge risk is evaluated, and a graded early warning instruction is output. According to the method, multi-modal features can be effectively associated, information redundancy is eliminated, GIS foreign matter identification accuracy and positioning precision are improved, and dynamic assessment and graded early warning of discharge risks are realized.

The invention provides an irradiation bubble defect repairing method and system, electronic equipment and a storage medium, and relates to the technical field of irradiation damage repairing. The repairing method comprises the following steps: applying a pulse current with a preset current parameter to a to-be-repaired area of a target substrate so as to activate a target atom in an irradiation bubble defect in the to-be-repaired area; applying an ultrasonic stress field with preset ultrasonic parameters to the to-be-repaired area within a first preset time after the application of the pulse current is ended; within a second preset time after the ultrasonic stress field is applied, the temperature of the to-be-repaired area is reduced to a target temperature interval; and performing laser shock on the to-be-repaired area based on the pulse laser with the preset laser parameters so as to repair the irradiation bubble defect. According to the method, the irradiation bubble defect can be repaired through cooperative treatment of three stages (an activation stage, an ultrasonic stress field stage and a laser shock stage).

The invention discloses a virtual reality tactile feedback interaction method and system. The method comprises the following steps: establishing a personal electromyographic signal table containing a mapping relationship among a target gesture action, an activated muscle combination and target electromyographic feature vector information of each activated muscle; in response to a received virtual gesture action, fed back by the host, of a virtual character making contact with an article in the virtual environment, obtaining a current myoelectricity feature vector of a current user and a personal myoelectricity signal table, and searching and obtaining an activated muscle combination and a target myoelectricity feature vector of each activated muscle from the personal myoelectricity signal table; according to the target myoelectricity feature vector and the current myoelectricity feature vector of each muscle, electric signal parameters of a target pulse current needing to be input by each muscle are obtained through calculation. According to the embodiment of the invention, the tactile feedback not only enables the user to obtain a gesture action feeling, but also obtains a force feeling, and the feeling is infinitely fit with the feeling of touching an object in an actual environment of the user, so that the immersive experience feeling is stronger, and the tactile feedback is more vivid.

A test method and apparatus for bipolar degradation of a diode, and a device. The method comprises: respectively performing static characteristic tests on a first diode and a second diode, so as to obtain a first static characteristic test result and a second static characteristic test result; setting a pulse test current, a pulse test time and a pulse cycle time, so that, on the basis of the pulse test current, the pulse test time and the pulse cycle time, a power semiconductor pulse current test device performs repeated short pulse current power cycle tests on the first diode under normal temperature conditions, and performs repeated short pulse current power cycle tests on the second diode under high temperature conditions; then, performing static tests, so as to obtain a plurality of static characteristic test results; and on the basis of the static characteristic test results, obtaining a bipolar degradation test result of a diode. By means of the method, bipolar degradation of the diode is tested, and the accuracy and reliability of the test result are improved.

The invention provides a superconducting diode and a preparation method thereof. The preparation method comprises the following steps: modulating the high-temperature superconducting Josephson junction device: connecting the first electrode to a power supply, connecting the second electrode and the third electrode to a voltage measuring device, and grounding the fourth electrode; reducing the environment temperature of the high-temperature superconductive Josephson junction device to a preset temperature lower than the superconductive transition temperature; direct current pulse current with a preset pulse signal is applied to the first electrode, so that a volt-ampere characteristic curve of the high-temperature superconducting Josephson junction device has a rectification characteristic; and applying an alternating current with a predetermined microwave signal to the first electrode, so that a voltage step appears on one side of the volt-ampere characteristic curve, and the other side of the volt-ampere characteristic curve is in a superfluid state. The superconducting diode is obtained by carrying out direct current modulation and alternating current modulation on the high-temperature superconducting Josephson junction device, and high rectification efficiency and high working temperature can be achieved.

The invention discloses a mechanical non-resonant one-bit phase electromagnetic reflection metasurface unit, and belongs to the field of artificial electromagnetic materials. The unit comprises a non-resonant electromagnetic structure and a mechanical driving device. The non-resonant electromagnetic structure comprises a dielectric layer, an air layer and an adjustable metal backboard from top to bottom; the mechanical driving device adopts a bidirectional self-holding electromagnet, a screw rod of the bidirectional self-holding electromagnet is connected with the metal back plate, the back plate is driven to be switched between two preset positions through forward / reverse pulse current, the thickness of an air layer is accurately adjusted, and therefore one-bit dynamic switching of a reflection phase between 0 degree and 180 degrees is achieved through propagation phase accumulation. In the 5G millimeter wave frequency band of 20 GHz to 29.5 GHz, the reflection coefficients of the two states are both larger than 0.99, the phase difference is stabilized within 180 degrees + / -20 degrees, and good robustness is achieved for mechanical displacement deviation. The unit has the advantages of zero static energy consumption, low insertion loss, wide bandwidth, simple structure and simple control, and is suitable for a low-power-consumption intelligent reflecting surface and a dynamic beam forming system.

Methods and systems for in-fluid testing of electro optic liquid sensors are provided. The electro optic sensor has a light source and a light detector such that a first power state is applied to the light source to generate a first light for determining whether liquid is present within the electro optic sensor. Based on a determination that liquid is present within the electro optic sensor, a second power state is applied to the light source for generating a second light. The second power state having higher power over a shorter period of time than the first power state. The second light generated from the light source is reflected and the reflected second light is received at the light detector. The reflected second light is compared to a pulse current threshold value to determine whether the electro optic sensor is functioning properly.

This application relates to the field of battery charging technology, and discloses a battery charging circuit, method, and apparatus. The battery charging circuit of this application includes: a data acquisition module, a power conversion module, and a control module. The data acquisition module is used to acquire battery operating parameters. The power conversion module receives a power signal at its input terminal and connects to the battery at its output terminal. When the control module detects that the operating temperature in the battery operating parameters is lower than a first preset temperature, it controls the power conversion module to output a pulse current signal to heat the battery to the first preset temperature. When the control module detects that the operating temperature is not lower than the first preset temperature and is lower than a second preset temperature, it controls the power conversion module to output a pulse current signal and a first constant current signal to charge and heat the battery. When the control module detects that the operating temperature is not lower than the second preset temperature, it controls the power conversion module to output a second constant current signal to charge the battery. This achieves coupled control of heating and charging, improving the synergy between thermal management and power injection.

The invention discloses a rehabilitation system and method based on motor imagery electroencephalogram signals and eyeball tracking. The rehabilitation system comprises a signal acquisition module used for acquiring the motor imagery electroencephalogram signals and recording limb state information; the signal processing module is used for storing the collected motor imagery electroencephalogram signals, determining a motor intention through the motor imagery electroencephalogram signals and outputting a selection instruction; the eyeball tracking module is used for tracking an eyeball watching interface prompt instruction and cooperatively sending a treatment instruction with the selection instruction; and the electrical stimulator module is used for receiving the treatment instruction and outputting stimulation pulse current according to the treatment instruction. Through cooperation of real-time collection of non-invasive motor imagery signals and an eyeball tracking technology, the defects that a single motor imagery electroencephalogram signal is few in classification mode and low in real-time classification precision are overcome, rehabilitation training modes of different parts are autonomously selected according to the intention of a subject, the initiative and enthusiasm of a patient in the rehabilitation training process are improved, and the rehabilitation training efficiency is improved. The rehabilitation treatment effect of the patient is effectively improved.

This invention discloses a live-line detection device and method for partial discharge in GIS (Gas Insulation System), relating to the field of live-line detection of power equipment. The equivalent capacitance between the primary and secondary windings of a current transformer coil is used as a pulse signal coupling channel. Two sets of pulse current signals within the high-voltage conductor of the GIS are acquired through these two pulse signal coupling channels. Then, the partial discharge voltage signal of a specified frequency is extracted through a pulse partial discharge detection circuit. The two extracted pulse signals are output to a differential mode comparison and acquisition module. This module compares the pulse signals input from the two channels, effectively eliminating interference signals. This invention simultaneously solves two problems in GIS live-line partial discharge pulse detection: pulse coupling and high-voltage side partial discharge interference during live operation. It achieves accurate detection of partial discharge during GIS operation, ensuring the safe and stable operation of GIS electrical equipment.

The invention provides an extrusion cogging method for realizing alloy surface nanocrystallization, which comprises the following steps: A) sequentially performing two-stage solution treatment and equal-diameter angular extrusion on an alloy bar, and applying alternating pulse current while performing equal-diameter angular extrusion to obtain an alloy subjected to dynamic strain aging pretreatment; b) placing the alloy subjected to dynamic strain aging pretreatment in a magnetic field, driving magnetic nanoparticles to impact the surface of the alloy by utilizing high-frequency vibration, and carrying out surface nanocrystallization; and C) placing the alloy workpiece subjected to surface nanocrystallization in a mold, and simultaneously carrying out in-situ superplastic forming and aging strengthening to obtain the formed alloy workpiece. According to the method, the dislocation density and the nano-structure thermal stability of the alloy material can be improved; the surface roughness Ra of the alloy material is effectively reduced to be smaller than or equal to 0.05 mu m, phase change is induced while in-situ superplastic forming deformation is conducted, a strengthening phase (such as gamma ') can be finer and more evenly distributed, and therefore higher strength and fatigue performance are obtained.

To widen a dynamic range and to stably use a device even when environmental temperature is changed.SOLUTION: The optical distance measuring sensor 101 includes a charge storage part 42 for storing electric charge for generating a pulse current to be given to a light emitting element 45, a setting part 21 for setting a target sensitivity of the optical distance measuring sensor, a pulse current control part 20 for generating a pulse current synchronously with a repetitive signal and pulse-driving the light emitting element, and adjusting the pulse current based on the target sensitivity, a light receiving element 35 for receiving reflected light, a first temperature sensor 33, a nonvolatile memory 32 for storing characteristic data of the individual light receiving element, a calculation part 2 for calculating a time from irradiation of light to an object to reception of reflected light based on a temperature measured by the first temperature sensor, the characteristic data and the target sensitivity.SELECTED DRAWING: Figure 1

The invention provides an electromagnetic ultrasonic transducer probe of a HalbacH permanent magnet assembly. The electromagnetic ultrasonic transducer probe comprises a shell, a magnet set, a coil assembly and a driving mechanism. The magnet group is accommodated in the shell, is formed by arranging a plurality of magnets according to preset polarities and is used for providing a bias magnetic field, and the coil assembly is arranged outside the shell, is positioned on one side close to the test piece and is used for exciting ultrasonic waves in the bias magnetic field and receiving ultrasonic signals reflected from the test piece after pulse current is introduced; a fixing frame is arranged on the periphery of the magnet set and used for installing and fixing the magnet set, a movable interval is formed between the fixing frame and the inner wall of the shell and located on the side, away from the test piece, of the magnet set, and the driving mechanism is installed on the shell, connected with the fixing frame and used for driving the magnet set to be away from or close to the coil assembly in the direction perpendicular to the test piece. And the distances between the magnet group and the coil assembly are different. The bias magnetic field intensity acting on the test piece is adjusted by adjusting the position of the magnetic assembly.

The invention relates to programming for non-volatile memory. According to an embodiment, a circuit for generating an adaptive set pulse current for a phase change memory (PCM) cell is disclosed. The circuit includes: a first current digital-to-analog converter (IDAC) and a second IDAC, each IDAC configured to generate a bias current having a programmable curve, the programmable curve including: a constant current phase at a predefined set current; a first ramp down phase from a predefined set current to a minimum off current; a second ramp down phase from a minimum off current to zero; and a zero current phase, wherein the constant current phase of each IDAC begins in response to another IDAC starting a second ramp-down phase; and a programming circuit configured to select one of the bias currents from the first IDAC and the second IDAC and generate an adaptive set pulse current.

The invention provides a method and a system for improving the partial discharge measurement sensitivity of a capacitor power-taking device, and the method comprises the steps: a measurement impedance coupling capacitor and a measurement impedance are connected in series and then are connected with a measured capacitor power-taking device in parallel, and pulse current generated by the partial discharge of the measured capacitor power-taking device enters a detection loop through the coupling capacitor; applying a pre-applied voltage to the tested capacitor power-taking device, wherein the duration time is a first preset time; reducing the voltage to the measurement voltage of partial discharge, and measuring the first open-circuit and short-circuit partial discharge capacity of the secondary end of the measured capacitor power taking device under open circuit and short circuit through the detection loop; reducing the voltage to a second preset measurement voltage, and measuring second open-circuit and short-circuit partial discharge amounts of the measured capacitor power taking device at the secondary end under open circuit and short circuit through the detection loop; and based on the first open circuit and short circuit partial discharge capacity and the second open circuit and short circuit partial discharge capacity, determining the partial discharge capacity of the capacitor power taking device. And the sensitivity and the accuracy of partial discharge measurement are improved.

The embodiment of the invention relates to the field of state diagnosis of a power system, and provides a grounding device defect diagnosis method based on multi-mode pulse cooperative modulation and a related device, and the method comprises the steps: generating and obtaining a four-dimensional adjustable pulse current sequence based on a pulse generator; injecting the four-dimensional adjustable pulse current sequence into a to-be-diagnosed grounding device, and collecting to-be-diagnosed voltage data and to-be-diagnosed current data of an injection point; according to the to-be-diagnosed voltage data and the to-be-diagnosed current data, performing time-frequency domain fusion analysis and calculating to obtain target defect feature data; and according to the target defect feature data, determining a defect level and outputting a maintenance decision, so that the accuracy of a defect diagnosis process aiming at the grounding state can be improved.

The application provides a pulse current generation circuit, a low-noise frequency reducer and a satellite receiver. The circuit comprises a pulse generation module, a current generation module and a current mirror module, the current generation module is electrically connected with the pulse generation module and the current mirror module, and the current mirror module is used for being electrically connected with an output end of an LDO in the low-noise frequency reducer. The pulse generation module receives a square wave signal and outputs a first pulse voltage at a falling edge of the square wave signal, and the current generation module generates a first current according to the first pulse voltage; the current mirror module outputs a pulse current according to the first current, and the pulse current is a pull-down current connected to the output end of the LDO. The pulse current generation circuit of the application generates and outputs the pull-down pulse current only in the period when the modulation wave needs to drop, effectively reduces the invalid current loss in the period when no demand is required, greatly reduces the average power consumption in the LNB power modulation process, and greatly improves the power conversion efficiency during the LNB power modulation.

A protection device against pulsed currents intended to transmit signals having frequencies lying in a transmission frequency band. The protection device has a signal conduction path and a shielding disposed around the signal conduction path. The signal conduction path has two spark gaps mounted in series and an inductor element linking a portion of the signal conduction path situated between the spark gaps. The inductor element is linked to the shielding. The protection device is configured as a high-pass filter allowing passage over the signal conduction path of the signals having frequencies lying within the transmission frequency band.