252 results about "High impedance" patented technology

A headset antenna and a connector for the same are provided. The headset antenna includes an audio signal line, an antenna and a high impedance element in specified application frequency ranges. The audio signal line is adapted for transmitting an audio signal and the antenna is adapted for receiving an RF signal. The high impedance element is disposed on a transmission path of the audio signal and generates a high impedance at a specified frequency band of the RF signal, so that the audio signal line is equivalent to an open circuit and the antenna obtains a better receiving capability.

The invention relates to the technical field of non-electrical variable control or regulation systems, and discloses a temperature rising blanket temperature closed-loop control method and system based on human body position recognition feedback, and the method comprises the steps: calculating a form compactness coefficient representing a heat dissipation boundary based on pressure data, and calling a mapping function to convert the form compactness coefficient into an equivalent thermal impedance estimated value; introducing the estimated value and dynamically constraining the forward channel gain of the temperature closed-loop controller according to a negative correlation strategy; according to the method, a real-time mapping mechanism of the contact topological characteristics and the control gain is constructed, so that the problem of model mismatch caused by body position change of the controlled object is solved; when the high-impedance contact state is detected, energy input is automatically reduced, the local heat accumulation effect is restrained, and the convergence and safety of the thermodynamic control process under the variable boundary condition are ensured.

The invention provides a two-stage current intensity adjusting method for an eye therapeutic apparatus, and the method comprises the steps: extracting the impedance effect intensity of a current at a macular center through recognizing the thickness of an impedance barrier layer corresponding to the current limiting degree of a high-impedance region, and combining with the actual penetration thickness, and obtaining the current penetration depth reduction proportion of the current penetration depth at the macular center; the current intensity imbalance degree of the coarse adjustment basic current intensity in the transition subarea is evaluated, and by obtaining the current intensity increase and decrease multiple of the fine adjustment compensation current intensity, the gradient difference between high impedance limitation and low impedance permeation is integrated, and the current intensity is compensated to balance the current intensity imbalance degree of the transition subarea; and updating the current output power level of each partition according to the fine adjustment compensation current intensity, and feeding back the current output power level to a therapeutic instrument circuit in real time to obtain uniform therapeutic intensity distribution so as to be matched with the decreasing proportion of impedance of impedance gradient distribution from high to low.

The invention relates to the technical field of power equipment on-line monitoring and fault diagnosis, and discloses a converter transformer bushing end screen voltage abnormity detection device and early warning method.The method comprises the steps that voltage data are collected through a wireless intelligent sensor, soft synchronization and self-adaptive windowing are achieved through a commutation notch feature locking mechanism, and a preprocessing signal is output; topological correlation clustering is executed to construct a virtual health reference, a dynamic residual sequence is extracted through time domain difference, and system side and equipment side features are decoupled; constructing a variational mode decomposition model, and calculating a characteristic entropy value of the intrinsic mode function; and comparing the entropy value with a threshold value, triggering an active impedance disturbance verification mechanism, controlling a sensor to access a load and comparing an actual voltage drop rate with a theoretical voltage drop rate, and determining an insulation degradation or poor contact fault. High-precision synchronization can be achieved without a hardware clock, and the problems that weak fault features are difficult to extract and virtual connection and insulation faults are difficult to distinguish in a high-impedance loop are effectively solved.

Technologies for impedance matching networks for qubits are disclosed. In one illustrative embodiment, an impedance matching network matches a 50 Ohm transmission line to a spin qubit with a state-dependent resistance of 100 kiloohms to 105 kiloohms. The illustrative impedance matching network is tunable, allowing the impedance transformation ratio to be changed without significantly changing the matching frequency of the impedance matching network. In some embodiments, the impedance matching network matches a 50 Ohm transmission line to a lower-resistance state of a qubit. In other embodiments, the impedance matching network matches a 50 Ohm transmission line to an impedance value in between a lower-resistance state and a higher-resistance state of a qubit.

The invention relates to the technical field of lithium batteries, and discloses a lithium battery cell with internal short circuit self-open circuit protection. Comprising a shell, an electrode assembly arranged in the shell, electrolyte, a positive pole and a negative pole, the positive pole and the negative pole are electrically connected with a positive electrode and a negative electrode of the electrode assembly respectively, and the electrode assembly comprises a positive plate, a negative plate and a diaphragm spaced between the positive plate and the negative plate; the battery is characterized in that a temperature or current sensitive fusible or high-resistance variable structure is integrated on the current collector of the positive plate and / or the negative plate, and the structure can automatically form a physical open circuit or a high-impedance area on a current path where a fault point is located when local temperature rise or sudden current increase exceeds a preset threshold value due to internal short circuit of the battery cell; therefore, short-circuit current is rapidly inhibited and thermal runaway spreading is prevented. By constructing a fuse or current gate type intrinsic safety structure in the current collector, the problems that when an existing lithium battery is subjected to internal short circuit (such as diaphragm failure, metal dendritic crystal puncture, impurity mixing and the like), a short circuit loop cannot be automatically cut off, so that current is intensively released, the temperature is sharply increased, and the service life of the lithium battery is influenced are solved. And the major safety problems of thermal runaway, fire and even explosion are further caused.

The invention relates to the technical field of microwave devices, in particular to a circular coaxial filter for annular micro-discharge verification and a preparation method of the circular coaxial filter. Comprising a filter, a coaxial stepped impedance structure is arranged in the filter, and the coaxial stepped impedance structure comprises a plurality of high-impedance structures arranged in series and a plurality of low-impedance structures arranged between the adjacent high-impedance structures at intervals; the input port, the output port and the low-impedance structure of the filter are all filled with polymer dielectric materials so as to form polymer rings through curing. The polymer ring in the middle of the filter is provided with an annular discharge gap to form a sensitive area; circumferential continuous groove arrays are formed in the two side walls of the annular discharge gap. Through groove treatment, the PTFE micro-discharge threshold value is increased to 700 W, the PI micro-discharge threshold value is increased to be larger than 2000 W, and the problems that the SEY of PTFE and PI polymers is high, the micro-discharge threshold value is low, and the micro-discharge risk is remarkably increased are solved.

A circuit breaker protects an electrical low-voltage circuit. The circuit breaker has a housing with first and second connections on the mains side and first and second connections on the load side, and an isolating contact unit connected to an electronic interrupting unit. The isolating contact unit can be switched by opening contacts to prevent current flow or by closing contacts for current flow in the low-voltage circuit. The electronic interrupting unit is switched by semiconductor-based switching elements into a high-impedance state for preventing the current flow or into a low-impedance state of the switching elements for the current flow in the low-voltage circuit. A current sensor determines the level of the current of the low-voltage circuit. A controller is connected to the current sensor, the isolating contact unit and the electronic interrupt unit, such that a first measuring impedance is provided between the first and the second load-side connection.

Method and process of fault detection in power systems using feature extraction from the measurements of the voltages and currents in the power system, as well as machine learning methods. A computer processor, such as an industrial computer, is connected to various voltage and current measurement systems in various locations. This, in turn, is connected to a server computer and control system. Electrical power fault signals (features) propagating through the power system network are analyzed using various measurements and feature extraction methods. These can be used to detect, classify, and localize the fault. The present methods are particularly useful for hard-to-analyze faults such as high impedance faults and faults occurring due to inrush currents, bidirectional power flows, and islanding issues.

The invention provides a high-resistance grounding fault detection method, device and equipment and a storage medium, and the method comprises the steps: collecting a three-phase current and voltage signal of a small-resistance grounding system, and carrying out the processing of the three-phase current and voltage signal to obtain a zero-sequence current and a zero-sequence voltage; when the zero-sequence voltage energy characteristic meets a preset condition, calculating fault grounding resistance according to the zero-sequence current, the zero-sequence voltage and system electrical parameters; calculating a transient zero-sequence current characteristic value and a steady-state zero-sequence voltage characteristic value according to the fault grounding resistance, and comparing the characteristic values with a threshold value; and when the two characteristic values are both smaller than the corresponding threshold values, determining that the fault is a high-resistance grounding fault. According to the method, the fault grounding resistance is calculated, the transient state and steady state characteristic criteria are deduced based on the resistance, and the detection basis is converted from direct measurement of the fault current to analysis of the fault resistance characteristics, so that accurate identification of the low-current high-resistance grounding fault which is difficult to detect by a traditional method is realized.

The invention discloses an electrolyte used in a high cut-off voltage environment and a preparation method thereof, and relates to the technical field of battery electrolyte materials. According to the electrolyte, molecular components with electrochemical activity in anthocyanin can be specifically extracted by utilizing the extraction effect of a reference electrolyte solution, and the molecular components can be preferentially adsorbed on the surface of a high-cut-off-voltage positive electrode with negative electricity through electrostatic interaction, so that a chain decomposition reaction can be cut off, lattice oxygen can be directly anchored, and the electrochemical activity of anthocyanin is improved. Lattice oxygen release is inhibited from the source; the synergistic effect of a dual protection mechanism of'dynamic clearing-static anchoring 'is realized; moreover, the impedance of ion transmission is prevented from being increased by utilizing high-speed centrifugal treatment; the electrolyte can significantly inhibit a chain decomposition reaction in a high cut-off voltage environment, effectively avoids the formation of an over-thick or over-high impedance interface layer, ensures the capacity and cycle capacity retention ratio of the battery in the high cut-off voltage environment, and is suitable for large-scale application in lithium batteries in the high cut-off voltage environment.

This invention discloses a high Curie temperature, high frequency, and high impedance manganese-zinc ferrite material and its preparation method, belonging to the technical field of soft magnetic ferrite materials. The manganese-zinc ferrite material consists of a main component and secondary components. The main component, calculated as oxides, comprises Fe2O3: 48.5–49.9 mol%, ZnO: 18.5–21.5 mol%, NiO: 0.5–2.0 mol%, with the remainder being MnO. The secondary components, by weight of the main component, include at least four of the following: Co2O3: 0.05–0.30 wt%, SiO2: 0.005–0.01 wt%, CaCO3: 0.02–0.05 wt%, ZrO2: 0.01–0.02 wt%, Bi2O3: 0.01–0.03 wt%, and V2O5: 0.01–0.05 wt%, mixed in any proportion. The resulting manganese-zinc ferrite material exhibits excellent properties such as high impedance.

Embodiments of the present disclosure provide an integrated circuit (IC) structure having a high-resistance semiconductor material between a substrate and a transistor. The IC structure can include a substrate, a high-resistance semiconductor material on a portion of the substrate, and a transistor on a top surface of the high-resistance semiconductor material. The transistor includes a semiconductor channel region between a first source / drain (S / D) region and a second S / D region in a horizontal direction. The high-resistance semiconductor material is between the transistor and the substrate in a vertical direction; a first insulator region is on the substrate and adjacent to the first S / D region in the horizontal direction; a first doped well is on the substrate and adjacent to the first insulator region in the horizontal direction. A first insulator region is between the first doped well and the transistor in the horizontal direction.

A switching device includes a lower cover, an upper cover, a slider, at least one elastic element, and a high-impedance conductive plate. The lower cover is disposed on a circuit board. The upper cover is disposed on the lower cover. The upper and lower covers form an accommodating space. The slider passes through the upper cover and is configured to slide relative to the upper cover in one direction. At least one elastic element is located in the accommodating space. The high-impedance conductive plate is connected to one end of the at least one elastic element. The high-impedance conductive plate deforms upon receiving pressure from the slider. The deformation causes a change in the resistance value of the high-impedance conductive plate. The high-impedance conductive plate generates a switching signal in response to the deformation. The deformation is associated with the resistance value of the high-impedance conductive plate. The switching device of the present invention can generate a switching signal between a pressed state and a non-pressed state, thereby increasing the flexibility and possibilities of keyboard key applications in the e-sports field.

The invention provides a high-precision voltage-stabilizing constant-current power supply for continuous discharge of a CO2 laser, which relates to the technical field of high-voltage voltage-stabilizing constant-current power supplies and comprises a high-voltage direct-current voltage-stabilizing power supply and a high-impedance amplification loop. The high-voltage direct-current voltage-stabilized power supply is boosted by a transformer, rectified by a rectifier bridge and stabilized by a filter capacitor, and continuously adjustable high-voltage output of 0-30kV is provided; the high-impedance amplification loop is composed of an operational amplifier, a three-stage triode amplification circuit and an electronic tube, the output impedance reaches up to 650 megohms, and the high-impedance amplification loop has the excellent constant-current characteristic. The power supply can accurately adjust the output current in the range of 0-30mA, the current fluctuation is less than one thousandth, the power supply can continuously and stably operate for more than 18 hours, and the power supply is suitable for laser discharge control in a high-temperature and high-density plasma environment. According to the invention, high-precision output is realized by adopting common performance devices, the advantages of voltage resistance, overload resistance and cost are considered, and the problems of poor current stability and inconvenient adjustment of a traditional laser power supply are solved.

The invention discloses a prototype comparison and knowledge distillation-based high-impedance fault unsupervised identification method and system, and the method comprises the steps: carrying out the standardization preprocessing of a high-impedance fault signal, and converting the high-impedance fault signal into a two-dimensional feature representation; performing deep feature coding on the two-dimensional feature representation by using a residual network, and extracting high-level semantic features; implementing a comparative learning strategy, and enhancing the discrimination of the features in a manner of drawing close the same kind of samples and pushing away the different kinds of samples; in the continuous domain adaptation process, a knowledge distillation technology is used for keeping priori knowledge; designing domain adaptation loss; performing weighted combination on the classification loss, the comparison loss, the distillation loss and the domain adaptation loss to form a total loss function; optimizing model parameters through gradient back propagation, and gradually adapting to a new target domain by adopting a continuous learning strategy; and performing fault type prediction on the test sample, and outputting a fault type and confidence. The method has the advantages of high detection precision, good environmental adaptability, high calculation efficiency and the like.

A stacked amplifier, radio frequency transceiver circuit, device and switching control method, the stacked amplifier comprising a first transistor (41), a second transistor (42) and a bias circuit (43); the bias end of the first transistor (41) is connected to ground, and the output end is connected to the input end of the second transistor (42); the bias end of the second transistor (42) receives a bias voltage through the bias circuit (43), and the bias circuit (43) comprises a bias resistor and a variable impedance device. High impedance in the off state can be achieved, and the bidirectional loss of the circuit is reduced.

The invention relates to the technical field of battery management systems, and discloses a BMS charging low-side wake-up circuit and wake-up method, and the wake-up circuit and method are provided with a first resistor, a filter circuit and two wake-up paths; the circuit can intelligently adapt to the on / off working conditions of a pre-charging loop, and ensures that the circuit can be reliably awakened in various states; when the charging MOS tube, the discharging MOS tube and the pre-discharging MOS tube are all disconnected, the first wake-up circuit is activated by detecting the high voltage difference by utilizing the voltage raised by the P-end through the whole vehicle load; and when the pre-discharge MOS tube is closed, the second wake-up circuit is activated by detecting a current path of the CRG interface to the ground. And the two paths are finally converged and a unified wake-up signal is output to the BMS to realize wake-up. Through the designed circuit, the circuit is insensitive to high-resistance interference resistance larger than 300 kilohms, and false triggering caused by moisture and contamination is effectively prevented. Meanwhile, wide-voltage work is supported, parameters can be flexibly adjusted through element selection and pasting, and design flexibility and cost optimization are both considered.

The invention discloses a wide dynamic range rectifier based on an automatic power distribution mechanism. The wide dynamic range rectifier comprises a high-power sub-rectifier and a low-power sub-rectifier, the high-power sub-rectifier comprises a high-power rectification trunk and a high-power rectification branch; the low-power sub-rectifier comprises a low-power rectification trunk and a low-power rectification branch; through the synergistic effect of a threshold switch control circuit and a tunable matching network arranged in a low-power rectification branch, the low-power rectification branch provides inductive impedance in a low-power state to compensate the inherent capacitive impedance of a low-power rectification diode, and presents a high-impedance state in a high-power state to turn off a low-power sub-rectifier. Therefore, the adverse effect of the low-power sub-rectifiers on the high-power sub-rectifiers is avoided while high-efficiency energy conversion in the low-power interval is ensured, and the overall rectification efficiency in the high-input power interval is remarkably improved.

The invention provides a digital phase circuit. The digital phase circuit comprises a first phase inverter, a second phase inverter, a third phase inverter and a fourth phase inverter. The first to fourth inverters are connected in series to form an inverter loop in which an output of the first inverter provides a first frequency signal, an output of the second inverter provides a second frequency signal, an output of the third inverter provides a third frequency signal, and an output of the fourth inverter provides a fourth frequency signal. Wherein the first inverter and the third inverter are operated in one of a high impedance mode and a normal mode, and the second inverter and the fourth inverter are operated in the other of the high impedance mode and the normal mode. The digital phase circuit can reduce jitter of frequency signals and reduce the problem of phase misalignment of internal frequency signals.

The utility model discloses a high-resistance and high-impedance neutral point grounding device capable of switching grounding modes, and relates to the technical field of motor maintenance. Comprising a grounding cabinet body, a high-voltage isolation switch K1, a grounding transformer B, a current transformer CT1 and a grounding end G which are connected in sequence. According to the utility model, a high-resistance and high-impedance switchable mode is adopted, the current amplitude of a ground fault is effectively controlled, and the stator core of the generator is protected, so that the effects of preventing the insulation of the stator winding from being damaged and avoiding the inter-phase or turn-to-turn short circuit are achieved.

The application discloses an electronic device and a charging method. The electronic device comprises a USB interface, a fast charging chip, a power management chip and a main chip. The fast charging chip comprises a DP module and a DM module. The power management chip comprises a DP input module, a DM input module, a DP output module and a DM output module. The USB interface is connected with the fast charging chip and the power management chip. The DP output module and the DM output module are connected with the main chip. When the power management chip detects that the port type is DCP, the DP input module and the DM input module are switched to a high impedance state, and the DP module and the DM module of the fast charging chip are switched to a low impedance state. When the power management chip detects that the port type is SDP / CDP, the DP input module and the DM input module are connected with the DP output module and the DM output module. Through the electronic device, the compatibility of fast charging and data transmission can be realized while reducing the cost.

A cable assembly has a connector to receive a signal, a cable connected to the connector, the cable having a length and one or more conductors along at least part of the length to conduct the signal, a magnetic material external to the one or more conductors, and an elastomer material external to the one or more conductors. A cable assembly has a connector to receive a differential signal, a cable connected to the connector having symmetric pair conductors, one or more discrete magnetic components spaced along the length of the cable, and one or more elastomer components next to at least one of the one or more magnetic components. A cable assembly has a connector to receive a differential signal, a cable connected to the connector having symmetric pair conductors, an elastomer material at least partially enclosing the cable, and a magnetic material at least partially enclosing the cable.

The application relates to the technical field of rotary transformers, in particular to a rotary transformer control protection circuit and a protection method thereof, wherein the circuit compares a feedback signal with a normal feedback threshold interval to determine the circuit state of the rotary transformer, can realize fast response to the abnormal state of the circuit, and thus protects the circuit in time. Meanwhile, when the feedback signal is in the normal feedback threshold interval, the feedback signal detection circuit can be regarded as an open circuit due to the high-impedance input characteristics of the comparator, the current of the feedback signal shared by the feedback signal detection circuit is very small, the feedback signal detection circuit cannot lower the amplitude of the feedback signal received by the AD decoding chip, the accuracy of the rotor angle calculated by the AD decoding chip is ensured, and the independence of protection and measurement is realized.

This application relates to a diode spike current suppression circuit, comprising: a first switching unit, a current sampling unit, an impedance switching module, and a switching control module; the first switching unit, the current sampling unit, and the impedance switching module are connected in series, and this series line is connected in parallel with the diode being protected; the first output terminal of the switching control module is connected to the control terminal of the first switching unit, and is used to adjust the current flowing through the first switching unit; the second and third output terminals of the switching control module are respectively connected to the impedance switching module, and are used to adjust the impedance of the impedance switching module. The solution of this application adjusts the current flowing through the first switching unit by regulating the conduction time of the first switching unit, and adjusts the current in the circuit by adjusting the impedance value of the impedance switching module connected in the circuit; this avoids long-term operation in a high-impedance circuit, greatly reducing power loss.

This utility model discloses a high-impedance ultra-fine signal transmission line comprising a central conductor and a first insulating layer and at least one second insulating layer sequentially disposed on its outer periphery. A shielding layer and an outer sheath are sequentially disposed outside the second insulating layer. The first insulating layer is a PFA insulating layer, and the second insulating layer is a PTFE insulating layer. This utility model solves the problem that traditional high-impedance ultra-fine signal transmission lines for medical equipment typically employ foamed PFA insulation or foamed PTFE wrapping processes to improve their characteristic impedance, but these methods suffer from difficulties in molding and poor performance.

The invention discloses a laser welding strong co-processing method and tool for a stranded conductor. The method sequentially executes five working procedures that radial compression force and axial pretension are applied to the stranded conductor to construct quasi-materialization constraint, and preheating is conducted; laser welding is executed in the local inert gas microenvironment, and the temperature of a molten pool is monitored; a sacrificial absorption layer is arranged, a deionized water restraint layer is injected, and a flexible anvil block loaded with liquid metal-based magnetorheological fluid is arranged on the back of a conductor; the magnetic field intensity is dynamically adjusted according to the material of a processing area, reflection is inhibited by using carrier liquid acoustic impedance matching in a low-impedance metal section, a backing is in a quasi-solidified state to absorb shock wave residual energy through magnetic particle chaining in a high-impedance metal section, and laser shock peening is executed; and after strengthening, the compression force is unloaded to recover micro-pores among the strands, so that the through-layer drying of stranding gaps is realized. According to the invention, multi-physical field cooperation of machinery, fluid, acoustics and thermodynamics is realized, and the process stability and service reliability of the joint are improved.

The disclosure relates to audio systems and methods with load impedance detection and current adjustment. An audio system (e.g., personal stage monitoring (PSM) receiver) may include an impedance detector that detects impedance of the connected load, and a current adjuster that provides an adjustable available current to the connected load based on the detected impedance. The current adjuster may be amplifier(s) (e.g., buffers) connected in parallel between an audio amplifier of the PSM receiver and the connected device. The current adjuster may adaptively adjust available current that may be provided / delivered to the connected device (e.g., when the connected device is a low-impedance load) and disable additional current made available to the connected device when the connected load is a high-impedance load. The impedance detector may be configured to measure the impedance of an unknown load in real time to facilitate the adaptive availability of the current by the current adjuster.

The invention discloses a rail-to-rail input bias current compensation circuit, which is characterized in that an input pair transistor module is formed by a PNP input differential pair and an NPN input differential pair which are connected in parallel, and can be switched to work or work simultaneously in a full common-mode voltage range to adapt to different input voltage conditions; secondly, the current sensing module samples the change of the bias current to generate a sensing current, so that the change of the bias current can be dynamically monitored and compensated; the current mirror module copies the sensing current, the input geminate transistor matching module serves as a matching transistor circuit of the input geminate transistor module, and after the sensing current is reduced, the sensing current is injected into the differential input end of the rail operational amplifier through the high-impedance current mirror module. The technical problems that in an existing PNP and NPN combined compensation method, the input bias current is large, the amplification factor difference of NPN and PNP tubes in a full-temperature region is large, and in a mirror image compensation method, only linear copying can be conducted on a direct-current working point, the nonlinear component of the input bias current Ib changing along with differential mode voltage Vdm cannot be tracked, and consequently nonlinear distortion is serious are solved.

The invention relates to the technical field of electrical measurement, and discloses an impedance spectrum-based distribution network line hidden defect online detection method and system, and the method comprises the steps: inputting a broadband current signal with the frequency point density in topological arrangement along with a line into a distribution network line; performing fast Fourier transform on the voltage response signals in the distribution network line, and synthesizing the transformed voltage response signals to obtain a real-time impedance spectrum of the distribution network line; binding impedance frequency spectrums collected under a defect-free working condition with environmental parameter labels, and collecting the bound impedance frequency spectrums into an impedance reference library of the distribution network line; matching a real-time environment parameter with the impedance frequency spectrum in the impedance reference library to obtain a reference impedance frequency spectrum of the distribution network line; and performing defect deconstruction on the frequency point deviation value of the reference impedance spectrum and the real-time impedance spectrum to obtain the hidden defect condition of the distribution network line. According to the invention, the efficiency of distribution network line hidden defect on-line detection of impedance spectrum can be improved.