528 results about "Limiter" patented technology

A telecommunications tray (50 / 300 / 400 / 600 / 900 / 1100 / 1200 / 1400 / 1800) is configured for mounting to a telecommunications fixture. The tray (50) includes a removably mounted telecommunications module (100 / 200 / 302 / 402 / 700 / 800 / 1000 / 1100 / 1300 / 1900 / 2000) that defines a body that is enclosed by a cover (1102 / 1320 / 1924) to define an interior. The module (100 / 200 / 302 / 402 / 700 / 800 / 1000 / 1100 / 1300 / 1900 / 2000) includes radius limiters (902 / 1356 / 1358 / 1954) within the interior for managing cables and defines connection locations for inputting and / or outputting signals via cables for processing within the module (100 / 200 / 302 / 402 / 700 / 800 / 1000 / 1100 / 1300 / 1900 / 2000), the telecommunications module (100 / 200 / 302 / 402 / 700 / 800 / 1000 / 1100 / 1300 / 1900 / 2000) movably mounted to the tray (50 / 300 / 400 / 600 / 900 / 1100 / 1200 / 1400 / 1800).

The invention relates to the technical field of servo motor control, and particularly discloses an intelligent control system and method for a servo motor, and the method comprises the steps: collecting the position, speed, current and acceleration data of the servo motor, and constructing a state vector; constructing a reference disturbance observer based on the theoretical parameters, and outputting an observation state, a disturbance value and an observation residual error; a multi-scale time sequence feature tensor is constructed by using the observation residual error and the state vector, and future disturbance is predicted through a CNN-Transform network; carrying out adaptive fusion on the neural network prediction result and the output of the reference observer; performing security constraint on disturbance compensation through a constraint filter and an amplitude limiter; and injecting the constrained compensation signal into a control system, and continuously optimizing the network performance through online incremental learning. According to the method, a traditional observer and a deep learning technology are fused, precise prediction and effective suppression of complex nonlinear disturbance are realized, and the control stability of the servo motor is remarkably improved.

The invention discloses a method for improving stability of a network-forming converter by considering voltage and phase transients, which solves the problem of over-current control blind areas existing at the initial stage of a fault and at the moment of clearing in a traditional single current limiting method and overcomes the defect that the stability is sharply deteriorated when a traditional strategy is used for coping with a composite fault. The method comprises the following steps: S1, obtaining a virtual synchronous machine swing equation under a synchronous rotating coordinate system and an equivalent circuit model under the action of a circular current limiter; and S2, obtaining a nonlinear relation between the output power and the power angle of the converter, and analyzing a transient stability domain of the converter during a fault period. And S3, obtaining a mixed current limiting strategy, deducing an equivalent circuit model corresponding to the strategy, and further obtaining an output power expression corresponding to the strategy. And S4, obtaining a power damping term acting on an active power control loop, further obtaining a synchronization stability improvement strategy, and deducing a closed-loop model describing the system at the moment.

The invention discloses a multi-channel audio calibration method, system and device and a storage medium, and relates to the technical field of audio, and the method comprises the steps: collecting and separating a main sound channel signal and a bass sound channel signal in a multi-channel audio signal; detecting time delay between a main sound channel and a bass sound channel based on a phase correlation algorithm, and performing adaptive delay compensation; the state change of the audio signal is monitored in real time, and before or when a signal switching event is detected, gradient gain envelope is applied to the bass sound channel signal, so that the signal amplitude gradually changes to a target value according to a preset nonlinear curve; a sonic boom event is analyzed and identified based on multi-dimensional characteristics, a self-adaptive amplitude limiter with a prospective processing capability is started for suppression, and harmonic distortion compensation and phase correction are carried out on a processed signal, so that the problems of signal asynchronization caused by low-frequency output delay of an audio system in the prior art, and the system reliability is improved are solved. Therefore, the low-frequency sound quality and the system stability are improved.

A gas distributor for improving ionization efficiency of a radio frequency ion thruster, comprising a gas supply pipeline, a cavity, a flow guide ball, radial rotational flow holes, axial diffusion holes and a flow guide ball limiter, the gas supply pipeline and the cavity are integrally formed, the radial rotational flow holes and the axial diffusion holes are dispersedly arranged in the cavity, the flow guide ball is filled into the cavity through the gas supply pipeline, the flow guide ball limiter is arranged in the cavity to prevent relative movement of the flow guide ball in the cavity, and the gas distributor composed of the gas supply pipeline, the cavity, the flow guide ball, the radial rotational flow holes, the axial diffusion holes and the flow guide ball limiter is arranged at the bottom of a discharge chamber of the thruster.

A telecommunications tray is configured for mounting to a telecommunications fixture. The tray includes a removably mounted telecommunications module that defines a body that is enclosed by a cover to define an interior. The module includes radius limiters within the interior for managing cables and defines connection locations for inputting and / or outputting signals via cables for processing within the module, the telecommunications module movably mounted to the tray.

The invention relates to the technical field of electric power systems, and discloses a GFL-GFM parallel system fault ride-through control method, system, device and medium, according to the method, under the condition that a GFL-GFM parallel system breaks down, a magnetic flux coupling current limiter is used for achieving fault ride-through, and when the fault of the GFL-GFM parallel system recovers to be normal, fault ride-through is achieved. When the power angle fluctuation of the GFL system and the power angle fluctuation of the GFM system are both larger than a preset power angle fluctuation threshold value, a phase-locked loop parameter of the GFL system and a control parameter of the GFM system are set based on a Sigmoid function until the power angle fluctuation of the GFL system and the power angle fluctuation of the GFM system are both not larger than the preset power angle fluctuation threshold value, the equivalent inertia and damping characteristics of the GFL system and the GFM system are enhanced, and the damping performance of the GFL system and the GFM system is improved. And the whole process of the GFL-GFM parallel system from a fault transient state to fault recovery is controlled, and the robustness of fault ride-through control of the GFL-GFM parallel system is improved.

The invention relates to a fault ride-through method based on hybrid synchronous control voltage / current source mode switching, aiming at fault ride-through (FRT) challenge in a novel power system, and breaking through the limitation of the existing solution from three key dimensions of overcurrent limitation, fault synchronization and reactive power support. On the basis of a hybrid synchronous control strategy, the damping characteristic of the system is remarkably improved, and the synchronous stability of the inverter during the fault period is effectively guaranteed; meanwhile, the intelligent control of smooth mode switching can be completed without complex switching logic or power grid information by utilizing simple detection of a saturation signal of a current limiter and combining with a mixed voltage / current source control architecture. Besides, the method has excellent short-circuit ratio (SCR) adaptive capacity, stable operation can be kept under different power grid strength conditions, and an innovative solution is provided for friendly improvement of new energy grid connection and transient performance optimization of a power system.

Apparatus and methods for power amplifier signal limiting are disclosed. In certain embodiments, a front-end system includes a low noise amplifier that amplifies a radio frequency receive signal during a receive frame, a power amplifier that amplifies a radio frequency transmit signal during a transmit frame, and a signal limiter operable to limit a signal power of the power amplifier in an attenuating mode. The signal limiter includes a radio frequency detector configured to generate a detection signal based on detecting a power level of the radio frequency transmit signal, and a latch that locks the signal limiter in the attenuating mode in response to activation of the detection signal. The latch is reset by a bias signal of the power amplifier that is activated during the transmit frame and deactivated during the receive frame.

The invention discloses a superconductive current limiter simulation modeling method based on PDE and a circuit module, and relates to the working principle and current limiting effect analysis of a resistance type superconductive fault current limiter. The method comprises the following steps: S1, selecting a two-dimensional axial symmetry space dimension, and designing a geometric model according to a solid structure of the pie-shaped superconducting fault current limiter; s2, establishing physical attribute parameters and variables of a plurality of physical fields, and adding materials and physical field boundary conditions; s3, realizing a general form partial differential equation (PDE), solid heat transfer and circuit physical field coupling, and performing mesh generation on the geometric model; s4, setting research steps, and modifying the configuration of the solver until convergence; and S5, post-processing a simulation result, generating one-dimensional diagrams of temperature, current and the like, and drawing data by utilizing Origin. According to the method, the magnetic field and temperature changes of the pie-shaped superconducting fault current limiter under the impact of the instantaneous short-circuit current are analyzed, the current limiting performance of the pie-shaped superconducting fault current limiter is analyzed, the voltage grade and the short-circuit current can be freely set, the operation is simple, and the calculation speed is high.

The present disclosure is directed to a rack power distribution unit (RPDU) that automatically and safely switches power to one or more receptacles. The RPDU includes one or more processors utilizing control algorithms that manage bistable relays so that in-rush current is minimized upon manual connection / disconnection of power to a load device. In particular, relay contact status (open / closed) is identified based on changes in RMS or peak voltage influenced by the load impedance. The RPDU is also configured to predict timings for voltage zero-crossing events. In this manner, and based on the determination of relay contact status and voltage zero-crossing prediction, open relay contacts are identified and safely closed at voltage zero-crossing.

A mobile terminal protective holder includes a shell body, a supporting plate, a supporting frame, an angle limiter, and a circuit board. Electronic products such as mobile terminals are arranged in an accommodating cavity of the shell body, and the supporting frame is rotatable with the supporting plate around an axis. A Hall switch and a light emitting member are provided on the circuit board. A magnetic member is provided on the supporting plate. When the supporting plate rotates, the magnetic member approaches or moves away from the Hall switch, thereby controlling the connection and disconnection of the Hall switch.

The utility model provides an adjustable amplitude limiter structure and radio frequency equipment, and relates to the technical field of radio frequency. According to the invention, multiple stages of diode discharge links formed by forward series connection of multiple diodes are arranged, so that respective middle connection points of two adjacent stages of diode discharge links are connected through a microstrip line, and respective anode connection ends of the multiple stages of diode discharge links are externally connected with forward bias voltage signals through the same choke inductor; and meanwhile, the respective cathode connecting ends of the multistage diode discharge links are grounded, and at the moment, the actual voltage values of the forward bias voltage signals can be adjusted, so that the multistage diode discharge links can be grounded under the action of different forward bias voltage signals. And the amplitude limiting circuit is used for carrying out amplitude limiting processing of different degrees on the radio frequency input signal acquired by the input matching circuit so as to dynamically adjust the amplitude limiting level of the corresponding amplitude limiter structure, so that the corresponding radio frequency output signal meets the input power requirements of the rear-end amplifier of different degrees.

The invention relates to the technical field of excitation systems, in particular to an excitation system which comprises an over-excitation limiter, and the curve coefficient of the over-excitation limiter is calculated through the maximum excitation current limit value, the maximum excitation current value under thermal limitation and the action time of the maximum excitation current limit value. The starting current value of the overexcitation limiter is calculated through the maximum excitation current value under the thermal limitation and the starting current offset, and when the excitation current reaches the starting current value, the overexcitation limiter reduces the excitation current according to the curve coefficient. By setting the maximum excitation current value under thermal limitation, the heating condition of the winding is more accurately considered by the over-excitation limiter. Dynamic adjustment is performed according to the heating condition of the winding, so that the safety of the generator can be ensured, and the performance can be exerted as much as possible.

Phase interpolators are provided, the phase interpolators including: a first phase interpolator having a first output that outputs a first interpolated clock signal based on quadrature clock signals and a first phase interpolator control signal; a second phase interpolator having a second output that outputs a second interpolated clock signal based on the quadrature clock signals and a second phase interpolator control signal that is shifted from the first phase interpolator control signal by half of an integral nonlinearity (INL) period of the first phase interpolator; and a phase combiner that outputs a third interpolated clock signal based on the first interpolated clock signal and the second interpolated clock signal. In some of these embodiments, the phase interpolators further comprise a first amplitude limiter that receives the first interpolated clock signal and outputs a first amplitude-limited interpolated clock signal that is provided to the phase combiner.

The invention discloses a turbine generator set power oscillation emergency valve switching control method, system, equipment and medium based on a thermodynamic model, and belongs to the technical field of electric power system automation control and thermal energy power engineering, and the method comprises the steps: monitoring the operation state of a set in real time, and collecting the current data of the set; calculating a theoretical balance valve position required for maintaining the current target power in real time by using the corrected inverse thermodynamic model; and the power fluctuation condition is monitored in real time, when it is detected that power oscillation happens to a unit and valve cutting logic is triggered, the system intercepts a conventional feedback instruction for tracking the actual valve position, the theoretical balance valve position is directly used as a target instruction, and a control valve is forcibly driven to act to the valve position through a rate limiter. According to the method, it can be ensured that after closed-loop control of the unit is cut off, the valve rapidly returns to the physical balance opening degree matched with the current load, an oscillation source is effectively eliminated, severe fluctuation of main steam pressure and temperature is stabilized, and the safety and stability of the unit under the abnormal working condition are remarkably improved.

A grid forming converter (32), is arranged to provide a single-phase or multi-phase converter current. Its control comprises: - a grid forming controller (33) determining (101) a voltage reference value (formula (I)); - a voltage controller (34) determining (102) a current reference value î; - a current limiter (35) determining (103), from the current reference value î, a limited current reference value (formula (II)); - a current controller (36) controlling (104) the converter (32) to provide the converter current i prescribed by the limited current reference value (formula (II)). Therein, at least while a fault condition is present, the voltage controller (34) generates a current reference î based on a relationship between a representative (formula (III)) of a virtual internal voltage (formula (IV)) and a representative (formula (III)) of an actual voltage value ν, the phase angle of the virtual internal voltage (formula (IV)) is controlled to match with the phase angle reference of the voltage reference (formula (I)) and the magnitude of the virtual internal voltage (formula (IV)) is adaptively changed depending on overcurrent conditions.

A grid forming converter (32), is arranged to provide a single-phase or multi-phase converter current. Its control comprises: • a grid forming controller (33) determining (101) a voltage reference value v̂; • a voltage controller (34) determining (102) a current reference value î; • a current limiter (35) determining (103), from the current reference value î, a limited current reference value ; • a current controller (36) controlling (104) the converter (32) to provide the converter current i prescribed by the limited current reference value . Therein, at least while a fault condition is present, the voltage controller (34) generates a current reference î based on a relationship between a representative v̂rep of a virtual internal voltage v̂vir and a representative vrep of an actual voltage value v, the phase angle of the virtual internal voltage v̂vir is controlled to match with the phase angle reference of the voltage reference v̂ and the magnitude of the virtual internal voltage v̂vir is adaptively changed depending on overcurrent conditions.

The utility model discloses a microwave radar receiver protection structure and method, the microwave radar receiver protection structure comprises a cascade amplitude limiter, the cascade amplitude limiter is arranged behind an antenna sum-difference device, and the cascade amplitude limiter is arranged in front of a receiver radio frequency front end circuit. The cascade amplitude limiter comprises a waveguide plasma amplitude limiter, a micro-strip amplitude limiter and a waveguide coaxial converter, the micro-strip amplitude limiter is cascaded behind the waveguide plasma amplitude limiter, and the waveguide coaxial converter is cascaded behind the micro-strip amplitude limiter. The starting threshold of the micro-strip amplitude limiter is effectively improved compared with the working threshold of other amplitude limiters, so that echo signals can enter a receiver with low loss, and the sensitivity of the receiver is ensured. According to the cascade amplitude limiter, the standing-wave ratio near the working frequency is slightly larger than 1, the loss is low, and the use requirement is met. According to the utility model, two stages of amplitude limiters with different forms are used, so that the high power resistance and the fast response time are improved; a micro-strip amplitude limiter is used to raise a starting threshold.

The invention discloses an enhanced transient stability improvement strategy and system for a grid-forming converter based on current amplitude limiting, and aims to effectively suppress a power angle instability phenomenon in a power grid fault or transient period and ensure that the converter has higher stability in a grid-connected process. The specific implementation comprises a dynamic dq-axis current amplitude limiting control strategy and a reference power control structure. Three-phase voltage and current of a grid-connected point of the converter are measured in real time, and a dq-axis current reference value and a power ring reference value are dynamically adjusted by combining a power angle and angular velocity deviation in an active power link, so that power angle instability during a transient period is accurately inhibited. According to the control strategy, the risks of overcurrent and system instability are effectively reduced, and particularly when a power grid breaks down or is in a normal condition, quick response and stable output of the system are ensured by switching the control modes in real time.

The present application relates to a kind of heating control method, electronic equipment and clothes processing equipment in the technical field of clothes processing equipment, when the first temperature variable T1 of temperature limiter is less than the temperature threshold Tj of temperature limiter, and the difference of the temperature threshold Tj of temperature limiter and the first temperature variable T1 of temperature limiter reaches set value ΔTd, it is judged whether the second temperature variable T2 of heating object reaches target heating temperature Ts, if the second temperature variable T2 of heating object does not reach target heating temperature Ts, the heating program automatically enters temperature compensation mode, in the temperature compensation mode, the second temperature variable T2 is assigned as T2', wherein T2 < T2', T2' ≥ Ts, can effectively avoid that heater frequently enters high temperature protection state, drying temperature fluctuation is small, drying effect is stable, and prolong the service life of heater.

The invention discloses a satellite-borne four-channel time-delay phase-shifting T / R assembly and a using method and an assembling method of the satellite-borne four-channel time-delay phase-shifting T / R assembly. The T / R assembly comprises a transmitting channel, a receiving channel and a common circuit, the transmitting channel comprises a power amplifier and a driving amplifier, the receiving channel comprises an amplitude limiter and a low-noise amplifier, and the common circuit at least comprises a delay phase shifter, a circulator, a one-to-four power divider and a bidirectional amplifier; the time-delay phase shifter is used for controlling the receiving and transmitting time delay of the assembly and compensating the wave beam pointing deviation of the broadband phased array and the unevenness of the equal-phase surface caused by the rotation of the factor array; and the bidirectional amplifier is used for compensating gain loss caused by the delay phase shifter. According to the embodiment of the invention, the delayer and the phase shifter are integrated, the T / R assembly can be suitable for a phased-array antenna with wide coverage and large instantaneous bandwidth through the time-delay phase shifter, and the requirements of a spaceborne system for the broadband high-precision time-delay phase-shifting assembly are met.

The application discloses a container ship valve body casting device with intelligent temperature control function and relates to the technical field of valve body casting devices. The container ship valve body casting device comprises a support, an electric sling, a moving beam, a pouring bag, a pouring table, a sliding frame and a hot-driven double-trip isolation curtain. The first and second limiters are alternately matched, so that the driving head reciprocates between the initial end and the end of the curved groove, and the cooling device is automatically started and stopped according to the pressure sensor signal, thereby realizing double-trip scraping of the isolation bevel and continuous collection of metal particles. The splashed metal liquid forms an oxide film in the air, the rough surface of the isolation bevel is bitten by the oxide film through surface depression, so that the splashed metal liquid can reliably adhere to the isolation bevel, thereby effectively reducing the risk of continuous splashing and diffusion. Part of the metal liquid adhering to the isolation bevel rolls downward along the bevel under the action of gravity and finally enters the collection groove, thereby realizing effective guidance and centralized collection of the splashed metal liquid.

Switching device (1) with at least one contact point (2) comprising a first contact (3) and a second contact (4), wherein at least one of the contacts (3, 4) is movable and the two contacts (3, 4) can be brought into contact with each other, and wherein the at least one contact point (2) is associated with an arc-quenching chamber (5) which is configured to extinguish a switching arc generated when the contacts (3, 4) are opened, and with a partition (6) which divides the arc-quenching chamber (5) into a first arc-quenching area (7) and a second arc-quenching area (8), and with an arc-blowing device (9) which is configured to blow the switching arc generated between the contacts (3, 4) away from the contacts (3, 4) in a first direction (10) or in a second direction (11) opposite to the first direction (10), wherein the switching device (1) includes a first deflection element (12) and a second deflection element (13). exhibitswherein the first deflection element (12) is configured such that the switching arc is deflected into the first extinguishing zone (7) when blown away in the first direction (10), and wherein the second deflection element (13) is configured such that the switching arc is deflected into the second extinguishing zone (8) when blown away in the second direction (11), characterized in that the partition (6) has at least one overflow opening (20) which is suitable for allowing the plasma generated by the switching arc to flow from one of the two extinguishing zones (7, 8) into the other extinguishing zone (7, 8), wherein the partition (6) preferably has at least 5 overflow openings (20) and further preferably at least 20 overflow openings (20), wherein the area of ​​the overflow openings (20) is at least 10%, preferably at least 20%, and further preferably at least 30% of the total area of ​​the partition (6).

1. The name of the design product: fireproof current limiting protector. 2. The use of the design product: the design product is used for electrical fireproof current limiting protection. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

This specification provides a rate limiting method, apparatus, electronic device, and medium for a distributed cluster. The method includes: if at least one token in the token set is greater than 0, calculating a token deviation value; if the token deviation value is less than a first threshold and the condition that all tokens in the token set are greater than or equal to 0 is not met, reducing the token generation rate corresponding to the token bucket rate limiter with tokens greater than the token number threshold, and increasing the token generation rate corresponding to the token bucket rate limiter with tokens less than the token number threshold; if every token in the token set is less than or equal to 0, calculating a rate deviation value based on the generation rate set; if the rate deviation value is greater than or equal to a second threshold, reducing the token generation rate corresponding to the token bucket rate limiter with a token generation rate greater than the token generation rate threshold, and increasing the token generation rate corresponding to the token bucket rate limiter with a token generation rate less than the token generation rate threshold.

1. The name of the design product: submarine cable bending limiter. 2. The use of the design product: for the bending protection of submarine cable, deep sea umbilical cable, offshore oil pipeline. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: perspective view.

A control circuit for an audio amplifier includes a reference voltage generator and a voltage limiter. The reference voltage generator generates a first reference voltage and a second reference voltage based on a supply voltage of the audio amplifier. The voltage limiter receives an audio input signal, the first reference voltage, and the second reference voltage, and generates an adjusted audio signal based on the audio input signal, the first reference voltage, and the second reference voltage. When a voltage level of the audio input signal is higher than the first reference voltage, the adjusted audio signal is limited to the first reference voltage, and when the voltage level of the audio input signal is lower than the second reference voltage, the audio input signal is limited to the second reference voltage. The input voltage limiter is used to generate a truncated input signal proportional to the desired output signal when clipping occurs. This prevents the control loop from being affected by inaccurate feedback information and enables faster transient response and less distortion.

Embodiments of the present application disclose an integrated circuit, an electronic device, and a communication system, which solve the problem of a proximity integrated circuit causing an electromagnetic disturbance in a proximity coupling device. The specific solution involves providing an integrated circuit, the integrated circuit comprising a bridge rectifier, a direct current limiter, and a first processor. Two input ends of the bridge rectifier are used to be coupled to two ends of an antenna, and a positive output end of the bridge rectifier is coupled to an input end of the direct current limiter. A negative output end of the bridge rectifier and an output end of the direct current limiter are coupled to an analog grounding end. A power supply end of the first processor is coupled to the input end of the direct current limiter, and a grounding end of the first processor is coupled to the output end of the direct current limiter.

In certain cases, volume limiting circuits are required for audio playback devices. In conjunction with wireless headphones, this can unnecessarily reduce the maximum reproducible volume. According to the invention, a volume limit in wireless headphones (100) can be modified or suspended by the headphones checking the type of audio source (330), receiving at least one parameter wirelessly, and automatically selecting an operating mode (340) depending on the parameter. The headphones can choose between a first operating mode (350) and a second operating mode (360), the first operating mode (350) corresponding to a first volume characteristic curve (210) with a first maximum volume (250) that is prescribed for open systems.The second operating mode (360) corresponds to a second volume characteristic (220) with a higher second maximum volume, which is only selected if the parameter indicates that the system is closed. Based on the volume characteristic (210, 220) corresponding to the selected operating mode, a user can adjust the playback volume of the headphones using a user interface (4202).