34 results about "Resistive type" patented technology

The invention belongs to insulation of superconducting power equipment, and particularly relates to a breakdown voltage prediction method for a liquid nitrogen, insulation barrier and bubble composite system. Comprising the following steps: acquiring electric field distribution characteristic parameters of the resistance type superconducting current limiter through simulation, and designing an equivalent electrode structure capable of reproducing electric field characteristics in a liquid nitrogen environment; establishing a first breakdown voltage prediction model taking the insulation barrier position parameters and the electrode spacing as variables; calculating the surface heat flux of the superconducting strip in the quench fault state; and introducing a bubble influence factor for correction to obtain a second breakdown voltage prediction model. A complex actual insulation system prediction problem is converted into an equivalent model problem which can be verified in a laboratory. And an accurate basis is provided for the insulation design of the resistance-type superconducting current limiter.

The invention discloses an input load compensation circuit, a digital-to-analog converter and a method for an R-2R resistive DAC (Digital-to-Analog Converter), and aims to solve the problem of unstable reference voltage caused by the change of an input load along with an input code. The circuit comprises a trend compensation branch and an adjacent code compensation branch which are both connected between a first reference voltage and a second reference voltage. The trend compensation branch controls a first resistance network through a thermometer decoder and generates a first compensation current used for compensating the overall change trend of the current. And the adjacent code compensation branch controls the second resistance network through the XOR gate circuit to generate a second compensation current for compensating the current difference between adjacent code words. Through a dual compensation mechanism, the total current on the reference voltage is effectively stabilized, and the linearity and the dynamic performance of the DAC are remarkably improved.

The utility model discloses a kind of high-efficiency heat dissipation resistance bimetallic strip, it is related to bimetallic strip technical field, including upper metal sheet, the bottom of the upper metal sheet is equipped with lower metal sheet, and the inside of the upper metal sheet and lower metal sheet is equipped with inner metal sheet, the side of the upper metal sheet is equipped with connecting plate, the inside of the connecting plate is fixedly connected with connecting column, the inside of the connecting column is threadedly connected with fixed bolt one, the side of the inner metal sheet is fixedly connected with heat-conducting sheet, the utility model is equipped with inner metal sheet inside the upper metal sheet and lower metal sheet, inner metal sheet inside fixedly connected heat-conducting sheet can absorb the heat on inner metal sheet, upper metal sheet and lower metal sheet inside the arc-shaped groove inside and heat-conducting sheet are clamped, the copper sheet of arc-shaped groove inside is in contact with heat-conducting sheet, heat is quickly discharged by radiating bump one and radiating bump two, improve the heat dissipation of resistance bimetallic strip.

This invention discloses a resistance testing method, relating to the technical field of intelligent testing, comprising the following steps: Step S100, testing a resistor of any type, independently analyzing the test results to obtain its own characteristics; Step S200, performing forward and reverse tests on the resistor under test according to the testing method, obtaining positive and negative results; Step S300, classifying the resistor under test into grades based on the positive and negative results and its own characteristics. This invention improves the scientific nature of subsequent analysis and the rationality of test parameters by screening effective historical data, avoiding irreversible damage to the resistor, and improving the economy of testing. By taking the average value of forward and reverse tests and analyzing the difference, it eliminates unidirectional systematic errors such as contact resistance, lead resistance, and thermoelectric potential.

The application discloses a resistance type airflow sensor, comprising: a front shell; a rear shell clamped at the rear end of the front shell; and a sensing element packaged between the front shell and the rear shell, wherein the sensing element comprises a hard plate base material and a sensing chip, the hard plate base material is fixedly installed with the front shell, the sensing chip is fixedly installed with the rear shell, one side of the hard plate base material is provided with a sensitive membrane, and the sensing chip is connected with the sensitive membrane through a wire harness. The protective plate is arranged on the front shell and the rear shell, the fan-shaped rubber pieces on the inner wall of the protective plate are mutually adsorbed and closed through rubber magnetic strips in the absence of airflow, a barrier is formed, and particulate matters and condensate in the airflow are effectively blocked from directly contacting the sensitive membrane; when the airflow passes, the airflow pressure pushes away the rubber pieces, allows the airflow to pass, but blocks most of the pollutants, thereby protecting the sensitive membrane from being polluted, ensuring long-term stability and accuracy of the sensor; meanwhile, the protective plate is connected with the groove through a threaded ring, is convenient to disassemble and clean, and maintenance convenience is improved.

The application discloses a GaN-based hysteresis comparison circuit and relates to the field of semiconductor circuits.The circuit comprises a comparator circuit, a feedback circuit and a current mirror circuit which are connected with each other.The comparator circuit comprises a first N-type GaN device, a second N-type GaN device, a third N-type GaN device, a fourth N-type GaN device and a fifth N-type GaN device.The feedback circuit comprises a sixth N-type GaN device, a seventh N-type GaN device and an eighth N-type GaN device.The feedback circuit is composed of N-type GaN-based active devices instead of resistance passive devices, and the output signal is fed back to the gate of the seventh N-type GaN device, so that the circuit gain is improved, and the signal conversion time is reduced.

The invention discloses a SysML-based resistance-type superconducting current limiter design method and device. The method comprises the following steps: S1, obtaining design requirements of a resistance-type superconducting current limiter and carrying out requirement analysis; s2, analyzing a function logic architecture of the resistance type superconducting current limiter according to design requirements; s3, converting to obtain a physical architecture of the resistance type superconducting current limiter through design parameters and a functional logic architecture; and S4, outputting and obtaining a design result of the resistance type superconducting current limiter through a physical architecture and a set thermoelectric analogy algorithm. According to the method, the technical problems that in the prior art, the complexity of finite element simulation and numerical simulation is too high, and the demand analysis and architecture design in the design process are insufficient are solved, the resistance type superconducting current limiter can be rapidly designed, and the accuracy and consistency of the design result of the resistance type superconducting current limiter can be improved.

The application discloses a single-voltage detection power comparison circuit and belongs to the field of analog integrated circuit design.The circuit is composed of a switch circuit (1), a voltage difference to current circuit (2), a current mirror circuit (3), a voltage to current circuit (4) and a comparison output circuit (5).The switch circuit (1) comprises two complementary switches and five switch arrays; the voltage difference to current circuit (2) comprises a first operational amplifier, a first resistor, a load current mirror and a diode-connected MOS tube; the current mirror circuit (3) comprises six P-type MOS tubes and a pair of N-type MOS tubes; the voltage to current circuit (4) comprises a second operational amplifier, a second resistor, an N-type MOS tube and a diode-connected MOS tube; and the comparison output circuit (5) comprises a current adder-subtracter and two buffers.The application supports an MPPT dynamic tracking algorithm, the comparator output indicates the disturbance direction, the impedance matching and the control strategy are integrated, the adaptability to different DC-DC topologies is enhanced, the system design is simplified and the cost is reduced.

The invention discloses a field-circuit coupling joint simulation modeling method for a resistance-type superconducting current limiter, which belongs to the technical field of simulation and comprises the following steps: constructing an electromagnetic heat calculation model of the resistance-type superconducting current limiter based on COMSOL; constructing a circuit simulation model of the resistance type superconducting current limiter power system based on Simulink; and performing joint simulation according to the electromagnetic heat calculation model and the circuit simulation model to obtain the average electric field intensity of the resistance type superconducting current limiter, the average temperature of each layer of the superconducting tape and the average current density of each layer of the superconducting tape. According to the method, through joint simulation modeling of COMSOL and Simulink, current distribution, temperature field distribution, magnetic field distribution, heating and temperature rise of the resistance type superconducting current limiter can be analyzed while parameters such as voltage and current in a circuit are analyzed.

The application discloses a preparation process of high-resistance M-type hexagonal ferrite and a prepared product, and belongs to the technical field of permanent magnet ferrite. The method comprises the following steps: step a, dosing: dosing pre-sintered materials and auxiliary materials according to a weight ratio, wherein the auxiliary materials include SiO2 0.05%-0.2%, CaCO3 0.5%, Al2O3 0.14% and HBO3 0.3% according to the mass percentage of the pre-sintered materials; step b, ball milling: putting the dosed materials and water in the step a into a ball mill and ball milling; and step c, sintering: sintering the mixture after the ball milling in the step b at 1175 DEG C.-1235 DEG C. The high-resistance M-type hexagonal ferrite prepared by the method has the following performances: Br 390-420 mT, Hcb 270-300 KA / m, Hcj 240-380 KA / m, (BH) max 31-33 kJ / m 3 , and the resistance is greater than 21 MΩ.

A magnetoresistive random access memory ("MRAM" for short) device includes at least one MRAM array. Each MRAM array includes a reference cell and a reference generator that generates a reference voltage between a first voltage and a second voltage, the first voltage being a function of a first current flowing through the first reference cell and the second voltage being a function of a second current flowing through the second reference cell, the first reference cell and the second reference cell are a pair of reference cells storing complementary values in a row of the MRAM array. Reference voltage can be automatically centered and track reading current changes of all PVT angles, and the reference voltage does not need to be adjusted. In some embodiments, the reference generator is used in cooperation with a current detection amplifier, and correct read data of all PVT angles can be reliably output.

The application discloses a resistance testing method, and relates to the technical field of intelligent testing, and comprises the following steps: step S100, testing any resistance model of resistance, independently analyzing the testing result, and obtaining self characteristics; step S200, performing positive testing and reverse testing on the resistance to be tested according to the testing method, and obtaining positive result and reverse result; and step S300, dividing the grade of the resistance to be tested according to the positive result, the reverse result and the self characteristics. Through screening of effective historical data, the application improves the scientificity of subsequent analysis and the rationality of testing parameters, avoids irreversible damage to the resistance, improves the economy of testing, eliminates one-way system errors such as contact resistance, lead resistance and thermoelectric potential through mean value taking of positive and reverse testing and difference value analysis.

The invention relates to the technical field of integrated circuits and provides a differential digital-to-analog converter. The differential digital-to-analog converter comprises two groups of N-bit resistor arrays and three-state switch arrays which have the same resistor array structure. The differential digital-to-analog converter provides a three-level sectional structure comprising three different reference voltages, reduces the area overhead of a switch, improves the conduction impedance matching, avoids the introduction of an additional dynamic circuit, facilitates the reduction of static power consumption, and improves the reliability of the converter. And application of a static circuit and related application of a high-precision resistance type digital-to-analog converter are facilitated.

The invention discloses a resistive readout unit circuit for FLASH memory calculation, which relates to the technical field of integrated circuits, and comprises a conversion module and a quantization module, the conversion module comprises a positive weight current conversion unit and a negative weight current conversion unit which have the same structure, the input end of the conversion module is respectively connected with a positive weight bit line and a negative weight bit line, and the output end of the conversion module is connected with the quantization module; each circuit comprises an operational amplifier, a driving transistor, a compensation resistor, a compensation capacitor and a compensation transistor; the quantization module comprises two sampling switches, two CDACs, a comparator and an SAR logic circuit, the input ends of the two sampling switches are connected with the output ends of the positive weight resistor module and the negative weight resistor module respectively, and the output ends of the two sampling switches are connected with the upper polar plates of the two CDACs and the positive input end and the negative input end of the comparator respectively. The resistance-type read-out unit circuit can stably perform driving and analog-to-digital conversion on the storage current which changes rapidly with a small area and a small power consumption overhead.

The invention discloses a temperature transmitter response time testing device and method, and relates to the technical field of temperature transmitter calibration, and the device comprises a tested temperature transmitter without a temperature sensor, a data recorder, a change-over switch, a first input signal, and a second input signal. The first input signal and the second input signal are connected to a first input binding post and a second input binding post of the change-over switch respectively. The input signal I and the input signal II are temperature signals of the same type, and the input signal I and the input signal II are thermocouple type potential signals or thermal resistance type resistance signals; an output binding post of the change-over switch is electrically connected with the input end of a tested temperature transmitter, and the output end of the tested temperature transmitter is electrically connected with the input end of a data recorder. According to the invention, the blank of the device and the method for testing the response time of the temperature transmitter without a temperature sensor is filled, and the test device and the method are proved by practice.

The application discloses a kind of endoscopic medical instruments, comprising: main machine and component, wherein component is detachably mounted to main machine, main machine includes identification circuit, component includes identity confirmation structure, identity confirmation structure includes following three types: resistance type, chip type or resistance chip type;Identification circuit can identify chip and identify resistance resistance value to judge the type of identity confirmation mechanism.The endoscopic instrument component of the application can be compatible with different types of components, and quickly identify component type, execute corresponding procedures, which can improve the work efficiency of doctors.

In the described example, the R2R digital-to-analog converter includes a plurality of arms and a voltage regulator (110). Each arm includes an arm switch (130) having a p-channel MOSFET (PFET) switch (132) and an NFET switch (134). The voltage regulator includes a differential amplifier (314), a p-ladder (308) including N cascode-coupled PFETs (306) and having first and second ends, an n-ladder (318) including γ×N cascode-coupled NFETs (316) and having first and second ends, a first resistor (310), and a second resistor (resistor γ×R) (312). The first p-ladder end is coupled to a first terminal of the first resistor. The second terminal of the first resistor is coupled to the input of the differential amplifier and the first terminal of the second resistor, the second terminal of the second resistor is coupled to the first n-ladder end, and the output of the differential amplifier is coupled to the second n-ladder end to provide the gate voltage of the NFET switch.

An RTD (Resistant Temperature Detector) test terminal and device are disclosed, relating to the field of PLC testing technology. Addressing the problems of excessive manual wiring and switching operations, low testing efficiency, susceptibility to connection errors or omissions, and difficulty in achieving rapid and stable multi-channel measurements in existing PLC testing processes, this invention provides an RTD test terminal. The terminal includes a main body with a circuit board, probes and pin sleeves, a cover plate, an upper cover plate, a back clamp bracket, a back clamp, a back clamp baffle, and pin sleeve slots. The probes and pin sleeves are used to contact the tested terminal. The circuit board is used for electrical connection with the probes and switching output levels. The cover plate and upper cover plate are used for encapsulation, and the back clamp bracket, back clamp, and back clamp baffle are used for clamping and mounting. This test terminal is suitable for rapid testing and switching measurements of RTD signal channels in PLC cabinets.

The application belongs to the technical field of directional coupler, and is a resistance type wideband directional coupler based on transmission line structure, which comprises two uncoupled uniform transmission lines, the two lines have a common reference ground, and are spatially isolated by a split surface, the split surface is perpendicular to the conductor plane between the connecting lines of the two uncoupled uniform transmission lines; an input port, a straight-through output port, a coupled output port and an isolation port are arranged on the two lines respectively. The two lines are both composed of quarter wavelength transmission line groups of the same order, one is a main transmission line, and the other is a coupled transmission line, and the characteristic impedances of the two lines are the same as the impedance of the external port. There is a coupling resistor across the quarter wavelength coupled transmission line group. The transmission line electric length between adjacent coupling resistors is a quarter wavelength; the application can reduce the requirement for processing error due to the symmetrical and simple structure, and has the characteristics of low reflection coefficient and ultra-wideband operation.

This invention discloses an isolated current source converter based on an SP-type pseudohermite coreless transformer, comprising a negative resistor, an SP-type pseudohermite coreless transformer, a full-bridge rectifier, and a load resistor. The negative resistor is connected to the input terminal of the SP-type pseudohermite coreless transformer. The full-bridge rectifier includes a first rectifier arm, a second rectifier arm, an output filter inductor, and an output filter capacitor. The switching nodes of the first and second rectifier arms are connected to the output terminal of the SP-type pseudohermite coreless transformer. The output filter inductor and output filter capacitor are connected in series and then in parallel with the first and second rectifier arms, respectively. The output filter capacitor is connected in parallel with the load resistor. This invention, using an SP-type pseudohermite coreless transformer as its core, realizes a coreless isolated current source converter with constant current output characteristics independent of the load. This invention achieves corelessness, greatly reducing the weight, size, and cost of the isolated current source converter.

This application discloses a calibration device and method for an active rod antenna, relating to the field of antenna calibration. The device includes a metal shielding housing and a resistive T-network module and a capacitor integrated within the metal shielding housing. The resistive T-network module simulates the input impedance of the active rod antenna, and the capacitor simulates the distributed capacitance. When the input RF interface is connected to a standard signal source, the output RF interface is connected to a spectrum analyzer, and the ground terminal is connected to the active antenna host, the antenna factor of the active rod antenna is calculated by measuring the first signal strength at the output RF interface and the second signal strength at the output port of the active antenna host, thus completing the calibration. This application enables portable, accurate, and efficient calibration of active rod antennas.

The utility model belongs to the technical field of high-side driving circuits, and particularly discloses a high-side driving circuit with over-temperature protection, which comprises a PMOS (P-channel Metal Oxide Semiconductor) tube M1, a divider resistor R2, a divider resistor R3, a resistor R6, an NTC (Negative Temperature Coefficient) thermosensitive resistor and an NPN type triode Q1, the G pole of the PMOS tube M1 is connected with one end of the divider resistor R2, the other end of the divider resistor R2 is connected with the S pole of the PMOS tube M1 and one end of the divider resistor R3, and the other end of the divider resistor R6 is connected with the other end of the NPN type triode Q1. The D pole of the PMOS transistor M1 is connected with a high-side driving output end; the other end of the divider resistor R3 is connected with the collector electrode of the NPN type triode Q1, and the base electrode of the NPN type triode Q1 is connected with one end of the resistor R6 and one end of the NTC thermosensitive resistor. The high-side driving circuit with the over-temperature protection function is realized, the function of an imported chip is achieved through combination of domestic devices, the circuit is simplified, and the maintainability of the circuit is improved.

This invention discloses a resistive humidity sensor with a wide measurement range. A humidity-sensitive material and a pair of parallel electrodes are disposed on a substrate. The humidity-sensitive material is located between the electrodes, forming a humidity-sensitive resistor. The key feature is that the humidity-sensitive material is non-uniformly distributed along the length of the electrodes, causing the resistivity-humidity characteristic curve of the humidity-sensitive material to gradually change. Furthermore, the resistivity-humidity characteristic curve of the humidity-sensitive material gradually changes along the length of the electrodes, from the near end to the far end, resulting in different optimal humidity-sensing sensitivities at different locations.

The utility model relates to the field of automobile manufacturing, concretely relates to a low pressure wire harness for mistake proofing of resistance type circuit. It includes cabin wire harness, front protection wire harness, left front bluetooth slave module and right front bluetooth slave module, is provided with the joint pressure point between front protection wire harness and left front bluetooth slave module, right front bluetooth slave module, forms the branch wire harness of left front bluetooth slave module and right front bluetooth slave module, the branch wire harness length of left front bluetooth slave module and right front bluetooth slave module is same and all is less than or equal to 1m. The utility model relates to the improvement cost of wire harness circuit is low, and the risk of wrong installation is solved forever, and other negative influence will not be brought.

According to the resistive pressure sensor with high sensitivity and wide detection range and the preparation process thereof, a mixed dispersion liquid of Mxene and graphene oxide quantum dots is used as a sensitive material, and the optimal sensitivity and response recovery time are obtained by controlling the mass ratio of the Mxene to the graphene oxide quantum dots. Under the action of external pressure, the pore structure of the sponge deforms to construct an internal conductive path, so that the resistance is reduced, and the pressure can be correspondingly detected by detecting the corresponding resistance change. Compared with a traditional method, the preparation technology of the sensitive material is simple, and unattended operation can be achieved in the preparation process; the method is compatible with a traditional pressure sensor preparation process, the yield and the yield are high, and planning manufacturing can be potentially achieved; meanwhile, the Mxene and the graphene oxide quantum dots are mixed and dispersed, so that the sensitivity, the stability and the pressure detection range of the sensor can be remarkably improved.

This invention proposes a compacted field reflector with a frequency selective surface (FSS) around its edge to address the severe low-frequency edge scattering problem of existing reflectors. The reflector comprises a parabolic compacted field reflector body and a frequency selective surface (FSS) loaded along its edge. The parabolic compacted field reflector body has a sawtooth edge. The frequency selective surface (FSS) includes a dielectric substrate and a resistor patch printed thereon. The dielectric substrate and the parabolic compacted field reflector body form a nested structure, with periodically arranged triangular sawtooths around its perimeter. The resistor patch is etched with a plurality of periodically arranged first cross-shaped slits and a plurality of second cross-shaped slits. This invention loads a resistor-type frequency selective surface structure at the edge of the reflector, reducing reflection abrupt changes and edge currents, improving edge scattering, and enhancing quiet zone performance, making it suitable for compacted field measurement systems.

The application relates to a preparation method and application of a flexible wearable wireless data glove. The application belongs to the field of printed electronics. The purpose of the application is to solve the technical problems that current wireless data gloves are not light and not fit. The method of the application is as follows: three kinds of liquid metal inks with different polymer dispersant contents are configured; the three kinds of liquid metal inks are respectively printed on a flexible substrate, and then pulse light sintering is carried out, so as to respectively obtain a bending sensor, a pressure sensor and a transmission circuit; after assembly, a flexible material is used for packaging. The application adopts the liquid metal inks with different polymer dispersant contents to be printed and then subjected to light sintering, so as to be respectively used as a circuit, a bending sensor and a pressure sensor. The prepared glove can distinguish the sensor categories by acquiring basic resistance, then calculate the resistance change rate based on the principle of the resistance type sensor, and then fit the actual situation to obtain desired data or complete the simulation of actions in VR.

The application relates to the technical field of energy monitoring, in particular to a temperature monitoring circuit, method, device and energy management system. The circuit comprises a plurality of resistance type temperature sensors, the temperature sensors are arranged at temperature monitoring points with different heat capacity characteristics respectively, are used for monitoring the temperature of the corresponding monitoring points, and a sensor network is formed by the plurality of temperature sensors in parallel, and the plurality of temperature sensors have different temperature-electricity characteristics. A signal acquisition circuit is connected with the sensor network, is used for converting the equivalent resistance of the sensor network into a single analog signal output, a signal processing unit is connected with the output end of the signal acquisition circuit, is used for collecting the analog signal, and performs characteristic analysis on the analog signal to determine the temperature monitoring point with abnormal temperature rise. On the one hand, the problem that the complexity is high and the cost sharply rises with the number of monitoring points is solved, and on the other hand, the temperature states of a plurality of monitoring points with different heat capacities and response characteristics such as battery cells and welding points are distinguished.

The application discloses a resistance type readout unit circuit for FLASH in-memory computing and relates to the technical field of integrated circuits, comprising a conversion module and a quantization module, the conversion module comprises positive weight current conversion units and negative weight current conversion units which are identical in structure, the input ends of the positive weight current conversion units and the negative weight current conversion units are connected with positive weight bit lines and negative weight bit lines respectively, and each of the positive weight current conversion units and the negative weight current conversion units comprises an operational amplifier, a driving transistor, a compensation resistor, a compensation capacitor and a compensation transistor; the quantization module comprises two sampling switches, two CDACs, a comparator and a SAR logic circuit, the input ends of the two sampling switches are connected with the output ends of positive weight resistance modules and negative weight resistance modules respectively, and the output ends of the two sampling switches are connected with the upper plates of the two CDACs and the positive input end and the negative input end of the comparator respectively. The resistance type readout unit circuit can stably drive and analog-digital convert the fast-changing memory-computing current with small area and power consumption.

The invention discloses a resistive airflow sensor, comprising: a front housing; the rear shell is clamped at the rear end of the front shell; the sensing element is packaged between the front shell and the rear shell, the sensing element comprises a hard board base material and a sensing chip, the hard board base material and the front shell are fixedly installed, the sensing chip and the rear shell are fixedly installed, a sensitive film is arranged on one side of the hard board base material, and the sensing chip and the sensitive film are connected through a flat cable. The protective plates are arranged on the front shell and the rear shell, the fan-shaped rubber sheets on the inner walls of the protective plates are mutually attracted and closed through the rubber magnetic strips when no air flow exists, a barrier is formed, particulate matter and condensate in the air flow are effectively prevented from directly making contact with the sensitive film, and when the air flow passes, the rubber sheets are pushed away through air flow pressure, and the air flow is allowed to pass; the protection plate is in threaded connection with the groove through the threaded ring, so that the protection plate is convenient to disassemble and clean, and the maintenance convenience is improved.