425 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 an adaptive stochastic resonance weak fault detection method based on kurtosis optimization, and belongs to the technical field of fault detection, and the method comprises the steps: collecting and preprocessing a transient signal on a cable line; constructing a bistable stochastic resonance model; kurtosis of the output signal is used as a fitness function, and potential well parameters of the bistable stochastic resonance model are optimized based on a particle swarm optimization algorithm; and substituting the optimized potential well parameter into the bistable stochastic resonance model, and processing the preprocessed transient signal to obtain an enhanced output signal for fault detection. The method has the beneficial effects that the stochastic resonance system is constructed on the basis of the classical bistable model, the kurtosis of the output signal is used as the fitness function of the particle swarm optimization algorithm, the potential well parameters are adaptively optimized, the potential well parameters are driven to automatically converge to the optimal state, and the robustness of the system is improved. The high-impedance grounding fault traveling wave signal can be extracted and enhanced from a strong noise background, and the detection sensitivity and reliability are improved.

The invention belongs to the technical field of electrical equipment fault monitoring, and discloses a fault monitoring system for electromechanical installation engineering, which comprises a high-impedance fault identification module, extracts nonlinear harmonic features through current signals, constructs a frequency domain-time domain joint feature set in combination with space-time magnetic distortion in an electromechanical installation process, and performs fault identification on the nonlinear harmonic features through the high-impedance fault identification module. Non-linear characteristic response identification of the high-impedance fault is carried out, and a high-impedance fault characterization result is output; the transient fault capturing module is used for positioning a risk time window according to a high-impedance fault characterization result, and identifying the starting and ending boundaries of an electrical disturbance behavior in combination with a double-threshold mutation mechanism; synchronously extracting corresponding operation condition parameters, constructing a short-time process behavior model taking electrical disturbance as a source, and outputting a transient disturbance sequence; and the sensitivity of fault identification, the accuracy of positioning and the real-time performance of diagnosis are integrally improved.

The invention discloses a sensor array acquisition system for detecting gas, and relates to the field of gas sensors. The sensor array acquisition system for detecting gas comprises a gas sensor array, a signal conditioning circuit, an analog-to-digital conversion module, a control module and a power supply module. According to the sensor array acquisition system for detecting the gas, the voltage follower circuit with high input impedance is adopted, so that the problem of attenuation during signal acquisition of a high-impedance sensor is effectively solved, and the signal acquisition precision is improved. Through the adjustable direct-current bias circuit and the differential amplification circuit, the dynamic adjustment of the measurement range is realized, the gas detection requirements of different concentration ranges can be met, and hardware does not need to be replaced. A constant-current driving chip is adopted to control a sensor heating circuit, heating current can be accurately set by adjusting external resistance, it is ensured that the sensor works at the optimal temperature, and the stability and response speed of the sensor are improved.

An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity. The transducing element may be an actuator which generates motion of an end wall in a direction perpendicular to the plane of the cavity to excite acoustic oscillations in the fluid in the cavity, and the cavity geometry and resonant amplification increase the amplitude of the resulting pressure oscillation. The cavity side wall or end walls contain at least one aperture positioned away from the center of the cavity to allow pressure waves to propagate into the surrounding acoustic medium.

The invention relates to the technical field of radio frequency integrated circuits, in particular to a harmonic suppression power amplifier combining a matching network and a feed network, which comprises a transistor, an input matching module, an output matching module, a stabilizing module and a bias module, the input matching module comprises a first parallel resonance unit, the first parallel resonance unit is used for second harmonic suppression, the output matching module comprises a series resonance unit and a second parallel resonance unit, the series resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic, and the second parallel resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic. The second parallel resonance unit is used for resonating at a third harmonic frequency and forms a high-impedance open circuit for the third harmonic, the output matching module is coupled to a drain electrode of the transistor, and the bias module comprises a grid bias sub-module and a drain bias sub-module. The grid bias sub-module is coupled to a connection node of the input matching module and the grid of the transistor, the drain bias sub-module is coupled to the output matching module, and the bias voltage of the transistor is jointly determined by the grid bias sub-module and the drain bias sub-module. The power amplifier has the effect of improving the efficiency level of the power amplifier while realizing harmonic suppression optimization.

The invention relates to the technical field of lithium ion batteries, in particular to a halogenated electrolyte modified low-impedance positive electrode and a preparation process and application thereof. The problem that an existing lithium ion battery positive electrode material is high in impedance is solved. According to the preparation method, the carbon-coated aluminum foil is used as the positive current collector, so that the positive current collector has relatively low contact resistance and relatively high adhesion, the charge transfer resistance and the internal resistance of the battery are reduced, and the rate capability and the cycle performance of the battery are improved; a positive active material is added, C6H12O6.H2O is adopted for carbon coating to improve the electron transmission capacity of lithium iron phosphate, titanium-vanadium co-doping synergistically improves the electron conductivity, and the electron conduction impedance is reduced; the halide solid electrolyte coats lithium iron phosphate to inhibit side reaction and reduce interface impedance; carbon nano tube coating inhibits particle aggregation and reduces charge transfer impedance; and the modified conductive agent and the modified binder are added, so that the lithium ion battery has higher cycling stability, electrochemical activity and lower impedance.

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 discloses an electric power system transient stability rapid response control method and system, and relates to the technical field of electric power systems, and the method comprises the steps: collecting a transient harmonic current signal generated by a power grid fault in real time through a harmonic detection unit connected to a DC bus of an energy storage converter, and calculating the phase offset of the transient harmonic current signal; generating a power control instruction through a pre-configured hardware mapping circuit based on the phase offset; acquiring a current differential signal by using a power grid line current sensor, and identifying a path of transient energy flowing to a key unit based on a power grid topological structure; for the path, dynamically forming a virtual high-impedance wall on the target line; and on a consumption path predefined according to the power grid topological structure, controlling the energy storage converter to operate in a current source mode and configuring a reverse power characteristic so as to absorb the energy flow turned by the virtual high-impedance wall.

The invention relates to the technical field of manganese zinc ferrite materials, and particularly discloses a manganese zinc ferrite high-frequency high-impedance material and a preparation process thereof. The manganese zinc ferrite high-frequency high-impedance material is prepared from the following raw materials: Fe2O3, Mn3O4, ZnO, a carbon nanotube loaded rare earth oxide composite material, P2O5, Co2O3 and CaCO3. The preparation raw materials of the carbon nanotube loaded rare earth oxide composite material comprise a multi-walled carbon nanotube and a rare earth salt, and the mass ratio of the multi-walled carbon nanotube to the rare earth salt is 1: (0.12-0.14). According to the invention, the loss capability of the manganese zinc ferrite material to electromagnetic interference is enhanced, and the problem that the magnetic conductivity and impedance of the material are reduced in a high-frequency environment is solved.

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.

The present invention provides an acoustic resonator device (1) having a resonator (R) comprising: a first electrode (2), a second electrode (3) arranged at a distance from the first electrode (2) in a first direction (z), wherein the first electrode (2) and the second electrode (3) extend along planes (E) arranged perpendicular to the first direction (z); and a layer stack (S) arranged between the first electrode (2) and the second electrode (3), which layer stack comprises a first piezoelectric layer (4) and a second piezoelectric layer (5), wherein the first piezoelectric layer (4) and a second piezoelectric layer (5) comprise a piezoelectric material, and an acoustic high-impedance layer (6) arranged between the first piezoelectric layer and the second piezoelectric layer;wherein an acoustic thickness (DR) of the resonator in the first direction (z) is n times half an acoustic wave (W) of a predetermined frequency, where n is a natural number greater than one. The invention also provides a corresponding filter component (10).

The invention discloses an impedance matching plate, an impedance matching system and an impedance matching method, and relates to the technical field of electronic engineering, the impedance matching plate comprises a control module and a series resistance module, the series resistance module comprises a plurality of resistor gating modules connected in series and a first switching device, the resistor gating modules are respectively arranged on different target resistor units, and the first switching device is connected with the control module. Each resistor gating module comprises resistors with different resistance values and a second switching device which are connected in parallel, and the control module receives a resistance value adjusting instruction containing a target resistance value and generates a control signal according to a resistance value setting field in the resistance value adjusting instruction; the series resistance module conducts the target resistance gating module connected with the first switching device corresponding to the target resistance unit according to the control signal, and conducts the resistor corresponding to the second switching device in the target resistance gating module to generate a target resistance value, so that the problems that the large-range resistance adjustment cannot be realized and the impedance matching efficiency is low can be solved; the technical effects of adjusting the resistance in a large range and improving the impedance matching efficiency are achieved.

A filter stage system comprising a continuous-time baseband filter comprising a feedback loop employing at least one first impedance node and at least one second impedance node, wherein the at least one first impedance node has a higher impedance than the at least one second impedance node, and wherein the at least one first impedance node provides a dominant pole and the at least one second impedance node provides a non-dominant pole, and wherein the continuous-time baseband filter generates a filtered current, and a mirror component mirrors the filtered current to an output.

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 high-impedance autotransformer comprises an iron core, a series winding, a common winding I and a common winding II, the common winding I and the common winding II are distributed in the axial direction of the iron core and located on different sections of the iron core, and the series winding, the common winding I and the common winding II are sequentially connected to the iron core in a sleeved mode. The coil supporting block is arranged between the windings and is fastened with the iron core; the supporting cushion blocks are arranged on winding end faces at the two ends of the transformer, and the coil supporting blocks and the supporting cushion blocks are made of insulating materials. The self-coupling transformer solves the technical problems that the self-coupling transformer in the prior art is low in short-circuit impedance and easy to damage during short-circuit impact.

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.

An electric power connector comprises an insulation body and two electric power assemblies, the insulation body is provided with a butt joint groove penetrating forwards, the butt joint groove penetrates in the vertical direction at the same time, and the two electric power assemblies are arranged on the left side and the right side of the butt joint groove respectively; each power assembly comprises a terminal group, a conductive block and a plurality of first locking assemblies; the terminal group comprises a plurality of elastic arms protruding forwards and a connecting part; the conductive block comprises a base part, a first clamping part and a second clamping part which extend forwards from the base part, and a wire mounting part which extends backwards from the base part; the connecting part of the terminal group is limited between the first clamping part and the second clamping part, and is fixed by a plurality of first locking assemblies penetrating through the first clamping part, the second clamping part and the wire mounting part. According to the conductive block, the first clamping part and the second clamping part are integrally formed and used for fixing the terminal set and the electric power extension line, the integration degree of the conductive block is improved, the number of parts in the switching process is reduced, and meanwhile heating caused by too high impedance due to multi-part contact in the switching process is reduced.

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.

A system for detecting single-phase ground faults is presented herein. Single-phase ground faults on ungrounded or high-impedance single-grounded three-wire power systems are determined by filtering the currents and voltages components to remove noise, extracting the pure-fault current components, and computing their magnitude. The faulted feeder is determined as the one with the largest zero-sequence pure-fault current. of each phase, and filtering the pure-fault current components to remove noise. The faulted phase is determined as the phase with the largest pure-fault current magnitude compared with the other two phases. The detection may be qualified using the fault zero-sequence voltage magnitude.

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.

An apparatus includes a first switch and a second switch connected in series between an input voltage bus and ground, a bootstrap capacitor connected between a bootstrap voltage bus, and a common node of the first switch and the second switch, and a bias power control circuit configured to function as a switched capacitor bootstrap circuit when the apparatus is configured to operate in a high impedance PFM mode, and configured to function as an active bootstrap circuit when the apparatus is configured to operate in another operating mode.

A method and system delivers customizable microcurrent stimulation to ocular tissue using a three half-bridge driver circuit. The system includes a control circuit that selectively switches high-side and low-side transistors, such as MOSFETs, to generate various electrical waveforms, such as stepped, asymmetric biphasic, pulsed, and triangular waveforms. These waveforms are applied to electrodes in contact with the eye for therapeutic treatment, addressing conditions like age-related macular degeneration (AMD) and other ocular disorders. The system allows for adjustments in amplitude, frequency, and duration of the waveforms, providing personalized treatment protocols tailored to patient-specific needs. High-impedance periods are included between pulses to promote tissue recovery and enhance patient comfort. Additionally, a non-transitory computer-readable storage medium stores a program that controls the system, enabling real-time waveform generation and dynamic adjustment during treatment. This approach offers a flexible and efficient solution for ocular therapy, improving both treatment outcomes and patient experience.

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.