33 results about "Milliampere" patented technology

The invention provides a direct current arc fault detection and elimination circuit and method, the circuit is connected with a relay, and the circuit comprises a switching power supply module, an MCU processor module, a direct current signal sampling module and a relay switch driving module; the direct current signal sampling module and the switching power supply module are powered by external direct current; the switching power supply module is connected with the MCU processor module, the direct current signal sampling module and the relay switch driving module; the direct current signal sampling module receives a current signal of a direct current circuit to be detected and outputs an analog voltage signal, and the analog voltage signal is transmitted to a PA0 port of the MCU processor; the AD conversion module in the MCU converts the analog voltage signal into a digital signal, and the MCU processor module sends a control signal to the relay switch driving module based on the digital signal. According to the scheme, high-voltage wide-voltage input is adopted, performance is stable, ripple waves are low, noise is low, the detection precision can reach the milliampere level, performance is reliable, the structure is simple, and cost is saved.

The present invention discloses an intelligent dimming type LED driving power supply, which includes a motherboard circuit and an embedded system circuit. The motherboard circuit includes a pin header TER2, a rectifier BD1, a transformer T1, a constant voltage driving chip IC1, a pin header TER3, a driving controller IC2 and a pin header TER1. The embedded system circuit includes a main control chip U1, an optocoupler U3 and a chip U2. The input end of the rectifier BD1 is connected to the input end of the pin header TER2. This intelligent dimming type LED driving power supply has the following advantages: First, the color temperature is constant during the dimming process, and no color change will be caused. Second, according to the characteristics of the human eye, a non-linear curve suitable for the human eye characteristics is provided by the single-chip microcomputer embedded system for dimming, with natural transition. Third, a linear optocoupler is used for isolation, reducing the control signal load of each power supply to 5 milliamperes, realizing one-to-many centralized control and safety isolation.

The application discloses an energy acquisition circuit for converting a microampere current source into a low-voltage milliampere energy source, comprising a first charging capacitor C1, a voltage trigger circuit, a voltage reduction circuit, a freewheeling filter circuit and a second charging capacitor C3; the application further discloses an SF6 gas density relay energy acquisition circuit and method, and a high-voltage primary equipment energy acquisition circuit and method; the application directly acquires a microampere energy source from an alarm contact DC220V power supply of an SF6 gas density relay or a leakage current of high-voltage primary equipment through the energy acquisition circuit, thereby eliminating the need for the SF6 density relay or the high-voltage primary equipment to lay an independent power cable.

A method for electrochemical oxidation of methanol includes applying a voltage to a solution, including methanol, in an electrochemical cell, including a working electrode that is at least partially coated with a catalyst composition, including phosphorus-doped Ag2WO4 nanoparticles. The amount of phosphorus present in the phosphorus-doped Ag2WO4 nanoparticles ranges from 5 to 30% of the total weight of the phosphorus-doped Ag2WO4 nanoparticles. When applying a voltage, the current density is greater than 5 milliamperes per square centimeter (mA·cm−2) at 0.58 Volt (V). During the application of voltage, the methanol is oxidized to form carbon dioxide and hydrogen.

The application discloses an energy acquisition circuit for transforming a high-voltage constant voltage source into a low-voltage milliampere energy source, comprising a power management chip U1, a high-frequency transformer T1 and an energy storage capacitor C5, wherein the high-frequency transformer T1 comprises a primary winding and a feedback winding on the input side and a secondary winding on the output side; the application also discloses an energy acquisition method of an SF6 gas density relay, wherein the energy acquisition circuit is connected in parallel with alarm contacts of the SF6 gas density relay and then connected into a power secondary system loop, and the energy acquisition circuit transforms a high-voltage constant voltage source acquired from the power secondary system loop into a low-voltage milliampere energy source to supply power to each circuit module of an electronic circuit part of the SF6 gas density relay; and the application directly acquires a microampere energy source from the alarm contacts DC220V power supply through the energy acquisition circuit, thereby eliminating the need to lay an independent power cable.

The invention discloses a device and method for measuring the temperature characteristic of a resistor disc, and belongs to the technical field of lightning arrester resistor disc testing. The device comprises a loop inductor, a loop resistor, an ignition sphere gap, a temperature simulation box and a parallel capacitor which are sequentially connected in series, the temperature simulation box can adjust the temperature, and a to-be-tested resistor disc sample is placed and connected in the temperature simulation box; the two ends of the resistor disc test object are connected in parallel with an adjustable resistance box; the two ends of the resistor disc sample are connected in parallel with a voltage divider used for voltage measurement. The lower end of the resistor disc sample is connected in series with a current collector for current measurement. According to the invention, the resistor disc test object is placed in the temperature simulation box so as to obtain different temperatures, the adjustable resistor box is additionally arranged so as to obtain the voltage under the current from dozens of milliamperes to dozens of amperes, and the resistance change trend and the positive and negative temperature coefficient turning point of the test object at different temperatures are further obtained; and an important basis is provided for selection of lightning arrester parameters.

A wireless system comprising a first wireless device and a second wireless device. The first wireless device is configured to operate with less than 15 milliamperes of current. The second wireless device has an internal power source and is configured to transmit one or more radio frequency signals to the first wireless device. The first wireless device is configured to receive the one or more radio frequency signals from the second wireless device. The first wireless device is configured to harvest energy from the one or more radio frequency signals. The first wireless device is enabled for operation after a predetermined amount of energy is harvested from the one or more radio frequency signals. A communication handshake occurs between the first and second wireless devices to indicate that the first wireless device is in communication with the second wireless device. The first wireless device is configured to perform at least one task from harvested energy.

The invention relates to the technical field of crystal silicon slicing, in particular to a wire welding method for broken tungsten wires, a method for cutting crystal silicon and application of the wire welding method to improvement of chromatic aberration caused by broken wire welding. The wire welding method for the broken tungsten wire comprises the steps that when a welding spot is welded, the welding current is controlled to be 22-26 milliamperes, and the wire welding time is 10-15 seconds. According to the wire welding method for broken tungsten wires, the method for cutting crystalline silicon and the application of the wire welding method for broken tungsten wires and the method for cutting crystalline silicon in the aspect of improving chromatic aberration caused by broken wire welding, the success rate of tungsten wire welding is increased by optimizing the welding parameters of the welding wires, and then the cutting efficiency is improved. And meanwhile, by reducing the line speed of missed welding spots, tungsten filament shaking is reduced, and chromatic aberration lines are reduced.

The invention relates to a synchronous rectification protection circuit and a control method of a power supply device. The circuit comprises a control chip, a semiconductor power switch tube and a protection branch. The control chip is provided with a voltage detection pin and a grounding pin, wherein the grounding pin is connected to a reference ground. The grid electrode of the semiconductor power switch tube is controlled by the control chip, and the source electrode is connected to the reference ground. The protection branch is connected between the voltage detection pin and the grounding pin and is composed of a Schottky diode and a current-limiting resistor which are connected in series. When the potential of the voltage detection pin is lower than that of the grounding pin, the Schottky diode is conducted in the forward direction, the voltage difference between the voltage detection pin and the grounding pin is limited to the forward conduction voltage drop level of the Schottky diode, and meanwhile the current limiting resistor limits the value of current flowing through the protection branch circuit to be in the milliampere magnitude. Through the Schottky diode clamping structure and the resistor current limiting structure which are connected in series, negative voltage protection of the control chip is achieved, and meanwhile the advantages of being low in cost, small in occupied area, high in reliability and the like are achieved.

The invention relates to the technical field of stamping and stretching, in particular to a stretching forming method of a connecting piece. The thickness of the connecting piece is T, and the volume of the product convex hull is V. The stretching forming method of the connecting piece comprises the following steps that S1, the connecting piece is stretched upwards so that a stretching convex hull can be formed on the connecting piece in a stretching mode, and the volume of the stretching convex hull ranges from 1.8 V to 2.5 V; s2, the stretching convex hull is extruded at least twice so that the outer diameter and the height of the stretching convex hull can be reduced, a compressed convex hull can be formed, and the size of the compressed convex hull ranges from 1.05 V to 1.15 V; and S3, the inclination angle of the side wall of the compression convex hull and the height of the thickness compression convex hull are shaped till the compression convex hull forms a product convex hull, the side wall of the product convex hull is T1, and T1 is larger than or equal to 0.8 T and smaller than T. And the thickness of the side wall of the product convex hull of the connecting sheet is more than 80% of the thickness of the connecting sheet, so that the resistance after the connecting sheet is electrically connected with the pole and the battery cell is less than 0.5 milliamperes.

A lead-free solar cell includes, in the following order, a back metal contact layer including gold (Au), a hole transport layer (HTL) including copper oxide (Cu2O), an inorganic absorber layer including rubidium germanium iodide (RbGeI3), a perovskite absorber layer including methylammonium tin iodide (MASnI3), an electron transport layer (ETL) including C60, and a front contact layer including indium tin oxide (ITO). The solar cell achieves a current density (Jsc) of greater than or equal to 20 milliamperes per square centimeter (mA / cm2) at an open-circuit voltage (VOC) of 0.94 volts (V).

The invention provides an electron / ion double-conductor paste additive and a preparation method and application thereof, and belongs to the technical field of lithium batteries. According to the invention, the polymer with high ion conduction performance is grafted on the carbon material with high electron conduction performance, so that electron and ion mixed conduction is realized, and the rate capability of the battery cell is improved. Experimental results show that the initial charge specific capacity of a battery assembled by the electron / ion double-conductor slurry additive is 318.4-334.6 milliampere-hour / g, and the initial discharge specific capacity of the battery is 288.1-301.8 milliampere-hour / g.

The invention relates to a compact superconducting cyclotron for isotope production. The high-current ion beam generator comprises a high-charge-state ECR ion source and a high-current proton source, the high-charge-state ECR ion source generates a milliampere-level high-charge-state heavy ion beam, and the high-current proton source generates a milliampere-level proton beam and a hydrogen molecule ion beam. An inlet of the injection beam line is connected with the high-charge-state ECR ion source and the high-current proton source. And a low-energy high-current ion mixed beam generated by the high-current ion beam generator is transmitted to the accelerator through the injection beam line. And the accelerator is connected with two symmetrical lead-out beam lines through a lead-out channel of the accelerator, and the two lead-out beam lines are positioned on the two sides of the accelerator so as to lead out a high-energy strong-current heavy ion beam and a high-energy strong-current proton beam. The advantages of the heavy ion beam and the proton beam are considered, and the medical TAT isotope is produced more efficiently and safely.

The application relates to an anti-magnetic field shunt, a power meter thereof and a manufacturing method of the anti-magnetic field shunt, which comprises a shunt and a PCB board, the shunt comprises a current inflow end, a resistance body and a current outflow end which are electrically connected in sequence, the shunt is sequentially provided with a voltage end, a first sampling end and a second sampling end, the first sampling end and the second sampling end are respectively arranged on the two sides of the center of the effective resistance body; the PCB board is provided with a voltage circuit end, a first sampling circuit end and a second sampling circuit end, the PCB board is internally provided with a reclamation circuit which extends horizontally from the first sampling circuit end to the position between the second sampling circuit end, the reclamation circuit vertically divides the effective resistance body into two same areas in the horizontal direction, and the area surrounded by the reclamation circuit corresponds to the area of the effective resistance body which is interfered by the external magnetic field in the vertical direction. Therefore, the anti-magnetic field accuracy of the meter load current can be improved when the load current is in the order of milliamperes.

The application discloses a flexible printed circuit board large current transmission method in a weak magnetic environment. The method comprises the following steps: designing a wiring structure, decomposing a current loop into an array form, and arranging in high symmetry; planning a flexible PCB laminated structure, designing a line width, a wiring spacing, a geometric size and the like according to the determined wiring structure, and connecting current conductors of different layers by using a via; and according to the structure and function of a transmission object, completing electrical connection, connecting the current connection of the completed wiring design to a solder pad, a connector and the like, forming electrical connection, and completing current transmission. The application can be applied to a large current in a weak magnetic environment, can reduce a magnetic field of a hundred-milliamperes current to a nanotesla order of magnitude, and has the functions of complex structure design and electrical connection.

The invention discloses a distributed photovoltaic output fitting system and method, and aims to solve the problems of insufficient acquisition means and low output measurement and calculation precision of a dispatching automation system after distributed photovoltaic grid connection. The system comprises a capacity statistics module, a template selection module, a data acquisition module, a data transmission module and an output fitting module. The method comprises the following steps: determining a sample substation by counting county-level regional distributed photovoltaic grid-connected capacity, deploying a micro-meteorological acquisition device in the sample substation, transmitting temperature, humidity and irradiance data to a 5000 scheduling system through a 4-20 milliampere interface, and then determining the grid-connected capacity of the distributed photovoltaic grid-connected system on the basis of correlation characteristics of photovoltaic output and meteorological parameters. And fitting and measuring 10-kilovolt and 380-volt distributed photovoltaic output in combination with tracking 110-kilovolt power station data and an algorithm containing multiple correction terms. According to the method, the blank of distributed photovoltaic monitoring is filled, the measurement and calculation precision is improved, the method is compatible with existing power grid equipment, the implementation cost is reduced, support is provided for power grid precise scheduling and new energy efficient consumption, and the method has important engineering application value.

The invention discloses a train control bus driving and protecting circuit and electronic equipment, and relates to the technical field of rail traffic control. The train control bus driving and protecting circuit comprises a first driving module, a second driving module and a protection module, the input end of the second driving module is electrically connected with the output end of the first driving module; the input end of the line compensation module is electrically connected with the output end of the second driving module, and the line compensation module is used for improving the response conduction rate of the first driving module; and the input end of the bus voltage drop path acceleration module is electrically connected with the output end of the line compensation module, and the output end of the bus voltage drop path acceleration module is grounded. The invention solves the problems that the steady-state current of the existing bus is only several milliamperes, the distributed capacitance of the cable is greatly influenced by factors such as temperature and humidity, wiring difference and the like, and the cable is capacitive; when a current control device is used for driving, the problems of slow response, no protection function and poor reliability during bus level rising and falling exist.

The invention discloses a virus inactivation and removal device, belongs to the technical field of pathogenic microorganism prevention and control, and aims to solve the problems of poor portability, ozone leakage, incomplete disinfection and the like of field sampling inactivation equipment. The device comprises an outer box assembly, an inner container functional assembly, an upper cover functional assembly and an electric control system, wherein the outer box is provided with a telescopic pull rod and a fourth-generation mute brake wheel, and a pressing type sealing lock catch is used for preventing ozone leakage; the inner container bracket is provided with 14 multi-specification detection bottle holes, is adaptive to different sampling bottles and has no killing angle; an ozone generator, a 265-285 nm cold electrode ultraviolet lamp (dual-mechanism disinfection) and a plasma module (residue removal) are integrated on the upper cover; and the electric control system realizes an automatic program (starting after sealing and alternately starting the plasma module to remove ozone after disinfection) through a logic control board. The device can be pushed by a single person, the 30,000-milliampere lithium battery supports 30 times of continuous operation, and the device is suitable for disinfection of a sewage new crown sampler, can also be popularized to the fields of environmental protection, sanitation and the like, and is safe, efficient and free of secondary pollution.

Electrosurgical generator for treating body tissue, comprising (a) a high-frequency (HF) generator providing electrical energy to a surgical instrument, said electrical energy being an HF alternating current (AC) voltage; (b) a direct current (DC) voltage source overlaying a DC voltage on the HF generator output; (c) the DC voltage source is configured to provide a voltage level in the range of 0 to 20 volts and a current level in the range of 0 to 200 milliamperes; (d) a control unit configured to modulate the DC voltage based on a desired tissue effect The modulation includes controlling switching the DC voltage between ON and OFF state. Thereby a well-controlled electroadhesion effect can be achieved or terminated. Accordingly, a controlled unsticking of tissue to the instrument as well as an intended sticking can be performed, both improving the surgical behavior of the generator and expanding its utility. The invention further relates to a method and system.

The invention discloses a large-current transmission method for a flexible printed circuit board in a weak magnetic environment. The method comprises the following steps: designing a wiring structure, decomposing a current loop into an array form, and performing high-symmetry arrangement; a flexible PCB lamination structure is planned, the line width, the wiring spacing, the geometric dimension and the like are designed according to the determined wiring structure, and the current wires of different layers are connected through via holes; electrical connection is completed according to the structure and the function of a transmission object, the current with the wiring design completed is connected to a bonding pad, a connector and other structures, electrical connection is formed, and current transmission is completed. According to the invention, a large current can be applied in a weak magnetic environment, a magnetic field of a hundred milliampere current is reduced to a Nattesla magnitude, and a complex structure design and an electrical connection function are realized at the same time.

The utility model specifically relates to a double-path high-precision small current acquisition circuit, comprising a voltage conversion circuit, the voltage conversion circuit is connected with a processor circuit and an acquisition amplification circuit, the acquisition amplification circuit is connected with a power circuit through a sampling resistor, and the acquisition amplification circuit is also connected with the processor circuit; the voltage conversion circuit is also connected with the input end of a power supply Vin, the sampling resistor is also connected with a power supply, and the power circuit is also connected with a driving power supply and a load; according to the utility model, by selecting the acquisition amplification circuits with different amplification factors and the sampling resistors with different resistance values, the acquisition of two paths of milliampere-level or ampere-level current is realized; the problems that in the power utilization field of an existing power system, a signal amplification circuit built through multi-stage filtering and an operational amplifier is complex in circuit and high in cost when used for collecting small current signals are solved, and the effects of being small in occupied space and saving cost are achieved.

The invention relates to a method for preparing an Al-Y2O3 composite coating through electro-deposition, which is used for preparing the Al-Y2O3 composite coating by using Y2O3 particles as second-phase particles through an electro-deposition technology. The preparation method comprises the following steps: putting anhydrous AlCl3, LiAlH4 and Y2O3 particles into a glove box filled with argon, weighing 4g of anhydrous AlCl3 and 0.28 g of anhydrous LiAlH4 by using a balance, putting the anhydrous AlCl3 and the anhydrous LiAlH4 into a beaker, and then weighing a certain amount of Y2O3 particles (20g / L-80g / L) and putting the Y2O3 particles into the beaker; and the beaker is sealed, taken out and put into a fuming cupboard. The method comprises the following steps: measuring 20ml of benzene by using a measuring cylinder, pouring the benzene into a sealed beaker by using a guide tube, and then putting the beaker into a magnetic stirrer under an ice bath condition; 5 ml of tetrahydrofuran is measured and slowly poured into the beaker through the guide tube, and in order to prevent the tetrahydrofuran from deteriorating, the process needs to be carried out under an ice bath condition. And adding tetrahydrofuran, sealing the beaker, stirring for 2-3 hours, and carrying out ultrasonic dispersion for 30 minutes. According to the method, an aluminum sheet is used as an anode, a copper sheet is used as a cathode, the current density is controlled to be 30-50 milliamperes / cm < 2 >, the temperature of a plating solution is 20-40 DEG C, the electrodeposition time is 30-75 min, and the Al-Y2O3 composite coating with the compact surface and uniform particle distribution can be obtained, and the Al-Y2O3 composite coating mainly comprises Al and Y2O3.

The invention discloses a micro-current detection circuit and method for a large-current load switch, the circuit comprises an operational amplifier, a first power tube, a second power tube and a current detection module, the operational amplifier is electrically connected with the first power tube, and the source electrode and the drain electrode of the first power tube and the source electrode and the drain electrode of the second power tube are connected in parallel. The first power tube and the second power tube are connected together between a power supply node and an output node, the proportional relation between the width-to-length ratio of the first power tube and the width-to-length ratio of the second power tube is N: 1, N is an integer which is far greater than 1, a grid electrode of the second power tube is electrically connected with the current detection module, so that the second power tube and the current detection module form a current mirror with the proportion of K: 1, and K is an integer which is far greater than 1. According to the scheme, through an innovative circuit architecture, the power tube can realize accurate detection of milliampere-level micro-current while having ampere-level large-current through-current capacity, so that the problem of detection precision degradation caused by great disparity of scale factors of a traditional current mirror architecture is solved.

A lead-free solar cell module having a top protective layer, a middle photoactive layer, a bottom protective later and a frame with the top protective layer, middle photoactive layer and the bottom protective layer secured in the frame. The middle photoactive layer includes a back metal contact layer including gold (Au), a hole transport layer (HTL) including copper oxide (Cu2O), an inorganic absorber layer including rubidium germanium iodide (RbGeI3), a perovskite absorber layer including methylammonium tin iodide (MASnI3), an electron transport layer (ETL) including fullerene (C60), and a front contact layer including indium tin oxide (ITO). The solar cell module achieves a current density (Jsc) of greater than or equal to 20 milliamperes per square centimeter (mA / cm2) at an open-circuit voltage (VOC) of 0.94 volts (V).

The invention discloses a charging system and a charging control method, and relates to the technical field of charging. The charging system includes a first electronic device and a second electronic device. The first electronic equipment comprises a first switch, a first charging chip, a first battery, a second switch and a load. The second electronic device comprises a third switch, a fourth switch, a direct current voltage regulating module and a second battery. In the charging system, the second battery in the second electronic equipment can supply power to the load of the first electronic equipment through the fourth switch and the second switch. As the current of the load of the first electronic equipment during normal working is relatively small and is generally dozens of milliamperes, the discharge current of the second electronic equipment can be reduced under the condition, so that the second electronic equipment can perform deep discharge, and the endurance of the first electronic equipment is further improved.

This invention discloses a wide-range current measurement dynamic compensation method and system for excitation system testing, belonging to the technical field of excitation system technology. This invention acquires the temperature of key chips in the signal conditioning module in real time, dynamically calculates zero-point offset and actual gain based on factory calibration parameters, performs digital filtering and noise reduction on the acquired voltage signal, and uses a single-iteration approximation method to complete initial current estimation and nonlinear correction, achieving full-range dynamic error compensation. The system includes a signal conditioning and acquisition module, a temperature acquisition module, a dynamic compensation processor, and an output module. This invention overcomes the shortcomings of traditional testing devices such as manual range switching, static calibration lag, and low accuracy at low currents. It can achieve continuous high-precision measurement over a wide range from milliamperes to tens of amperes, effectively suppressing temperature drift, noise, and nonlinear errors, significantly improving testing efficiency and stability, and is suitable for on-site maintenance and commissioning of hydropower station excitation systems.

The invention discloses a method and device for generating a magnesium ion beam in an ion implanter, and relates to the technical field of semiconductor manufacturing, and the method comprises the following steps: heating a solid-state source containing magnesium iodide to form steam containing magnesium iodide; conveying the steam containing magnesium iodide into an ion source arc chamber; the steam entering the ion source arc chamber is ionized to form plasma containing Mg < + >; mg < + > in the plasma is led out to form a milliampere-level magnesium ion beam; the magnesium iodide-containing solid source is completely composed of magnesium iodide or a mixture of magnesium iodide and a magnesium simple substance. According to the method provided by the invention, milliampere-magnitude magnesium beams can be generated, and injection use can be met; the magnesium iodide and the magnesium elementary substance are mixed to be used as a solid-state source, so that the magnesium ion beam can be improved, the service time of the ion source is prolonged, and the maintenance frequency is reduced.

The invention discloses a positive pressure explosion-proof fluidized bed electrostatic detection device, and relates to the field of electrostatic detection, the positive pressure explosion-proof fluidized bed electrostatic detection device comprises an electrostatic probe unit, an electrostatic measurement unit, a support connection unit and a positive pressure explosion-proof unit, the support connection unit comprises a support conduit and a support flange fixed outside the support conduit; the supporting flange is used for being installed at a pipe connecting opening of a fluidized bed reactor, the electrostatic probe unit is installed in the supporting guide pipe, the two ends of the electrostatic probe unit extend out of the supporting guide pipe, and one end of the electrostatic probe unit is used for receiving static electricity generated in a fluidized bed. The electrostatic measurement unit is used for converting static electricity received by the electrostatic probe unit into a milliampere signal and transmitting the milliampere signal to the upper computer for display; the positive-pressure explosion-proof unit comprises a positive-pressure explosion-proof box, the positive-pressure explosion-proof box is connected to one end, located outside the fluidized bed reactor, of the supporting guide pipe, and the electrostatic measurement unit is arranged in the positive-pressure explosion-proof box. And the reliability, the accuracy and the adaptability of electrostatic detection are improved.

The application relates to an insulator leakage current digitized sampling mutual inductor, belonging to the technical field of current mutual inductors. The sampled insulator leakage current is converted into a digital signal in the mutual inductor and is output. Active Hall devices are used to make the mutual inductor work in a zero magnetic flux state, and the sampling of the insulator leakage current is realized. A TIA transimpedance amplifier is used to realize accurate sampling of the insulator leakage current. A programmable TIA transimpedance amplifier is used to realize adjustment of the amplification ratio of the TIA transimpedance amplifier, and then accurate analog-digital conversion of a single ADC is realized, and the conversion of the analog signal into the digital signal is completed. The application solves the problem that the traditional analog voltage signal transmission is easy to be disturbed, and according to the state control of the amplification ratio of the programmable TIA transimpedance amplifier according to the size of the insulator leakage current, accurate sampling sampling from tens of microamperes to tens of milliamperes is obtained.

The invention relates to the field of current measurement, in particular to a current measurement system and method based on a three-coil zero-flux closed loop. The output voltage of the power supply module enters the power supply conversion module to provide zero potential reference, and interacts with the single-chip microcomputer module through a trigger signal Trip when the power supply module is abnormal; the power supply conversion module receives the output voltage of the power supply module, converts the output voltage into low-volt voltage and supplies power to the sensor module and the single-chip microcomputer module; the sensor module outputs a closed-loop signal based on a three-coil zero-flux closed loop, and the single-chip microcomputer module interactively realizes separation extraction and compensation feedback of direct-current and alternating-current components; the single-chip microcomputer module carries out current calculation verification on a closed-loop signal output by the sensor module. According to the invention, the problems of low precision and weak anti-interference capability in the prior art are effectively solved. In addition, by introducing an inspection correction mechanism and a risk early warning mechanism, data validity verification and abnormal protection functions are realized, the measurement precision and the measuring range of milliampere-level current are remarkably improved, and the anti-interference capability is enhanced.