231 results about "High-pass filter" patented technology

The invention discloses a multi-mode hybrid energy storage cooperative control method and system for a megawatt-level network-building type energy storage power station, and the method comprises the steps: S1, collecting the frequency, voltage amplitude and phase of a power grid, and the charge state and temperature of each energy storage branch, and generating real-time monitoring data; s2, determining an operation mode of the energy storage power station based on a comparison result between the frequency deviation and the voltage deviation in the real-time monitoring data and a preset threshold value; s3, based on the operation mode of the energy storage power station, performing double-layer decomposition on the power instruction through a high-pass filter and a low-pass filter to generate a super-capacitor power instruction and a lithium battery power instruction; s4, generating an internal potential amplitude and a phase angle by adopting a virtual synchronous machine algorithm; and S5, on the basis of the amplitude and the phase angle of the internal potential and the detection result of the power grid connection state, executing switching control of a network construction type control mode or a network following type control mode. The millisecond-second level multi-time scale power optimal distribution is realized; self-adaptive inertia and voltage support is carried out; and island / grid-connected seamless switching is realized.

The invention discloses a beat frequency comparison device mediated by an optical frequency comb. The beat frequency comparison device comprises the optical frequency comb, a first frequency stabilized laser, a first beat frequency device, a first frequency mixer, a first high-pass filter, a second frequency stabilized laser, a second beat frequency device, a second frequency mixer, a second high-pass filter, a DDS signal generator, a third frequency mixer and a low-pass filter. Frequency-stabilized lasers output by the first frequency-stabilized laser and the second frequency-stabilized laser and an optical frequency comb output by the optical frequency comb are subjected to beat frequency in the first beat frequency device and the second beat frequency device respectively, and first beat frequency and second beat frequency are obtained; the first beat frequency and the second beat frequency are mixed with the carrier envelope offset frequency of the optical frequency comb, and a first sum frequency and a second sum frequency are filtered out; the first sum frequency obtains a synthetic frequency through direct digital frequency synthesis; the second sum frequency and the synthetic frequency are mixed in the third mixer, and then the difference frequency is filtered out through the low-pass filter. According to the invention, beat frequency comparison of frequency-stabilized lasers with different wavelengths can be realized, and the influence of the stability of the optical frequency comb is avoided.

The invention relates to a double-branch reconstruction type image anomaly detection method for industrial quality inspection, and belongs to the field of anomaly detection. The method comprises the following steps: 1) carrying out pseudo-anomaly synthesis on an original industrial image, and constructing a training sample containing anomaly features; 2) adopting a pre-trained feature extraction network to perform feature extraction on the pseudo abnormal samples and the normal samples; 3) using a Butterworth high-pass filter to extract a high-frequency component of the pseudo abnormal sample; 4) constructing a double-branch reconstruction network, respectively reconstructing the pseudo-abnormal features and the high-frequency components, and realizing feature alignment and reconstruction of pseudo-abnormal data by taking normal sample feature distribution as a target; and 5) verifying the effectiveness of the proposed method in an anomaly detection task through a comparison experiment with a plurality of existing methods. The innovation point of the invention lies in providing a new pseudo-abnormal data generation mechanism, designing a space and high-frequency double-branch reconstruction network, and significantly improving the detection capability of structural and logic anomalies in industrial quality inspection.

A vehicle includes a suspension system having a damping system that includes a plurality of dampers and a plurality of damper valves. The vehicle further includes one or more processors configured to determine energy content of an acceleration signal indicative of acceleration of the vehicle. The one or more processors are further configured to dynamically tune a cutoff frequency of a high-pass filter based on the energy content of the acceleration signal. The one or more processors are configured to filter, via the high-pass filter, a velocity signal derived from the acceleration signal to output a filtered velocity signal. The one or more processors are configured to control operation of the damping system based on the filtered velocity signal.

The invention relates to the technical field of control of a hybrid energy storage system of a direct-current optical storage overcharge station, and provides a double-layer fuzzy dynamic power distribution control method of a hybrid energy storage system, which comprises the following steps of: performing combined optimization by taking a direct-current bus reference current Idcref, a super capacitor state SOCsc and a storage battery state SOCbat as input; a first-layer fuzzy controller is constructed to dynamically adjust a filtering time constant T to serve as a parameter of a high-pass filter, and an initial power distribution instruction is generated; constructing a second-layer fuzzy controller to dynamically adjust the super capacitor protection state instruction Isc; and finally, based on the data obtained in the above process, adjusting the output reference current of the hybrid energy storage battery and the output reference current of the super capacitor in real time. According to the method, the charge states of the storage battery and the super capacitor are comprehensively considered at the same time to dynamically distribute the power, and the economical efficiency and the safety of operation of the hybrid energy storage system are improved.

The invention provides a network construction type converter fault ride-through control method based on model predictive control and a resonance controller, and the method comprises the following steps: A, obtaining a reference value of power under a fault according to a network construction type converter and a virtual synchronous generator (VSG) mathematical model with the purpose of providing required positive sequence reactive power; step B, extracting a fault transient component through a high-pass filter and generating a capacitor voltage positive sequence reference value by using a resonance controller; step C, selecting different capacitor voltage negative sequence reference values according to different control targets; step D, obtaining a filtering current reference value through the reference values of the positive sequence capacitor voltage and the negative sequence capacitor voltage, and constructing a cost function containing current amplitude limiting; and selecting an optimal voltage vector. Compared with the existing method, the method has the advantages that the transient suppression is faster, the steady-state current is not influenced, the resonant controller specifically suppresses a 50Hz transient component, and the reactive response speed is improved by 43% compared with that of a virtual impedance method.

The application discloses a kind of LCL grid-connected current feedback active damping control method and system, belong to power filter control technical field, including the grid-connected current i2 of the acquisition inverter net side;Grid-connected current i2 flows through negative low-pass-high-pass filter and is handled, obtains feedback current;Feedback current and the output of inverter current controller are superposed, as the control signal of LCL filter.The application will not amplify high-frequency harmonic current, and the control system still has good robustness when LCL filter parameter changes.

The application discloses a local discharge signal processing method and device under high-frequency square wave voltage, wherein the method comprises the following steps: filtering low-frequency noise signals of a test power supply by using a high-pass filter with a preset cutoff frequency, wherein the test power supply is a high-frequency square wave power supply for local discharge test of an insulation sample; obtaining a local discharge starting voltage of the insulation sample, collecting a local discharge signal when a test voltage is the local discharge starting voltage, obtaining a characteristic frequency band of local discharge of the insulation sample according to the local discharge signal, and the test voltage is a high-frequency square wave voltage of the test power supply; performing modal decomposition on the local discharge signal of the characteristic frequency band to obtain a plurality of modal components, selecting a plurality of modal components satisfying a preset condition to perform noise reduction processing and signal reconstruction, and obtaining a denoised local discharge signal of the insulation sample under the high-frequency square wave voltage. The application can avoid interference of the high-frequency square wave power supply on the local discharge signal, and obtain a local discharge signal with high signal-to-noise ratio under the high-frequency square wave voltage.

To provide a partial discharge measuring device and partial discharge determination method for AC rotating electric machines that are inexpensive, do not require modification work on existing equipment, and have a low risk of accidents. [Solution] The partial discharge measuring device 1 according to the present invention measures partial discharge occurring in an AC rotating electric machine 3, and is characterized by comprising: a metal foil electrode 5 of a predetermined area attached to the outer surface of the power main cable 13 within 1 m from the end of the lead wire 11 of the AC rotating electric machine 3; a circuit 7 with one end connected to the metal foil electrode 5 and grounded via a detection resistor 25; and a partial discharge measuring device 9 that measures the voltage signal caused by the partial discharge occurring at both ends of the detection resistor 25 by inputting it via a high-pass filter 27.

The application relates to the field of high-pass filters, and relates to a high-pass filter processing device and a swing processing platform. The high-pass filter processing device comprises a base and a glue injection mechanism, the base is fixedly connected with a supporting column, the supporting column is slidably installed with a supporting plate, the glue injection mechanism comprises a glue storage bin fixedly connected with the base and a glue outlet pipe fixedly connected with the supporting plate; the glue storage bin and the glue outlet pipe are connected through a pipeline, the bottom of the glue outlet pipe is installed with a first glue outlet head, the supporting plate is installed with a conversion component, the first glue outlet head is connected with the conversion component, the conversion component is installed with a second glue outlet head which can also be connected with the glue outlet pipe; the high-pass filter swing processing platform comprises the high-pass filter processing device and a supporting table fixedly connected with the base, the supporting table is rotatably installed with a rotating disc, the rotating disc is installed with multiple groups of clamping components for fixing the filter. The application improves the problem of low processing efficiency of the filter.

The invention discloses a jitter suppression method and system for an AGV. The method comprises the steps that a rotor speed signal and a torque instruction signal of a permanent magnet synchronous motor of the AGV are collected; performing discretization sampling on the rotor speed signal to obtain a discrete speed signal; performing spectral analysis on the discrete speed signal to extract a corresponding vibration spectrum, and obtaining a main frequency point where resonance occurs; inputting the discrete speed signal into a high-pass filter to extract a component required by active damping suppression of a vibration frequency point, carrying out discretization differential on the discrete speed signal to obtain an acceleration signal, and carrying out band-pass filtering on the acceleration signal by adopting a band-pass filter to obtain a component required by acceleration feedback suppression; the cut-off frequency of the high-pass filter and the center frequency and bandwidth of the band-pass filter are determined by main frequency points; and a compensation torque signal is obtained according to the jitter component and the component required for acceleration feedback suppression, so that jitter caused by resonance of the AGV is suppressed according to the compensation torque signal.

A protection device against pulsed currents intended to transmit signals having frequencies lying in a transmission frequency band. The protection device has a signal conduction path and a shielding disposed around the signal conduction path. The signal conduction path has two spark gaps mounted in series and an inductor element linking a portion of the signal conduction path situated between the spark gaps. The inductor element is linked to the shielding. The protection device is configured as a high-pass filter allowing passage over the signal conduction path of the signals having frequencies lying within the transmission frequency band.

This invention belongs to the technical field of information technology, specifically disclosing a method and system for AGC load allocation in hydropower stations considering vibration risk. The method includes: acquiring real-time tilt angle time-series data of the unit bearing housing and guide vane support; processing the real-time tilt angle time-series data using preset high-pass and low-pass filters; the high-pass filter output representing rapid fluctuation components changing from seconds to minutes, and the low-pass filter output representing slow drift components changing from hours to days; calculating the transient vibration impact index and the long-term structural degradation index based on the amplitude characteristics of the rapid fluctuation components and the cumulative trend of the slow drift components, respectively; the transient vibration impact index reflecting the instantaneous mechanical stress level caused by the current load adjustment; the purpose of this invention is to solve the problem in the prior art of how to simultaneously identify and weigh the transient vibration risk caused by rapid tilt angle changes and the long-term structural degradation risk caused by slow tilt angle drift in load allocation decisions.

The application discloses a kind of virtual synchronous generator transient damping control methods based on state observation, comprising the following steps: step S1: the original rotor motion equation of VSG is constructed, and equivalent transient unbalance torque item is acted on the virtual shaft of VSG, the augmented dynamic model of VSG is obtained, and augmented state space equation is constructed;Step S2: the state vector of the state observer of classic Luenberger is estimated and corrected using Luenberger state observer combined with the measurable output of VSG model, and the recursive formula under the sampling period of step S2 is given;Step S3: the comprehensive feedforward compensation link containing high-pass filter is introduced, and strong active damping is provided in transient oscillation frequency band, combined with the recursive formula in step S2, the transient damping control of virtual synchronous generator under frequency band isolation is realized. T s The application provides strong transient active damping for system without increasing the order of main control system, effectively avoiding high-frequency noise amplification, and completely cutting off the interference to steady-state channel.

The utility model relates to a pole switch with integrated coupler and capacitive voltage sensor, including, first electric capacity CH is connected with power A, and second electric capacity CL is connected with first electric capacity CH, one input of high pass filter and low pass filter is connected with one end of second electric capacity CL respectively, the output of high pass filter is connected signal coupler, the utility model promotes long -term reliability and measurement accuracy: in traditional scheme, because voltage sensor and communication coupler are separate, are easily affected by outside environment and lead to system unreliable or measurement inaccuracy. And the utility model through adopting low pass filter isolation high frequency signal ensures voltage sensor normal work, and uses high pass filter to guarantee signal coupler normal operation, effectively prevented high frequency communication signal to voltage sampling loop's crosstalk and strong power frequency voltage to coupler's damage, improved the long -term reliability and voltage measurement accuracy of system.

According to some embodiments, a receiver comprises a positive terminal, a negative terminal, a first isolation capacitor connected to the positive terminal, a second isolation capacitor connected to the negative terminal, a resistor circuit connected to the first isolation capacitor and the second isolation capacitor to define a first high pass filter, an amplifier connected to the first high pass filter, a level detector connected to the amplifier, and a second high pass filter connected between the first high pass filter and the level detector.

The invention discloses a centrifugal switch vibration signal acquisition and analysis method, and relates to the technical field of centrifugal switch testing, and the method comprises the steps: designing a vibration signal acquisition circuit frame which comprises a vibration sensor, a signal conditioning circuit, a band-pass filter, a high-speed data acquisition circuit and data processing software; establishing a signal conditioning circuit, wherein the signal conditioning circuit comprises a constant current source module, a signal blocking module, a buffering and amplifying module, a direct current bias level adjusting module and a low-pass filtering module; building a band-pass filter, and using an active second-order low-pass filter and an active second-order high-pass filter to improve the bandwidth of the band-pass filter; a high-speed data acquisition circuit is established, and a high-precision AD sampling chip is adopted to acquire data; analyzing the collected data through data processing software by using a wavelet transformation algorithm and a sliding window standard deviation algorithm to obtain a vibration signal starting moment; when the vibration signals are collected, the precision is high, and the vibration time is accurately judged.

A method for operating a speaker, in particular a dynamic-speaker, in which a useful signal for producing sound by the speaker is linearized. According to the disclosure, the useful signal is filtered depending on frequency and only a filtered portion of the useful signal is linearized. Advantageously, the useful signal is filtered by a high-pass filter and / or a low-pass filter. In one embodiment, only a portion of the useful signal that is output by the low-pass filter is linearized.

This amplifier circuit (10) comprises: a 90° hybrid circuit (50) having an input terminal (50a) and output terminals (50b and 50c); a power amplifier (11) having a first input end and a first output end, the first input end being connected to the output terminal (50b); a power amplifier (12) having a second input end and a second output end, the second input end being connected to the output terminal (50c); a synthesis circuit having a third input end, a fourth input end, and a third output end; a high-pass filter (21) connected between the first output end and the third input end; a low-pass filter (22) connected between the second output end and the fourth input end; inductors (51 and 52) connected to each other in series between the first output end and a power supply terminal (120); and a switch (43) connected in parallel to the inductor (52).

To provide a motor control device that suppresses an error component caused by a brake or the like, makes an estimated motor speed closer to an actual motor speed, and improves control accuracy of a motor. The motor control device includes a controller (6) that outputs a first torque command signal that commands torque of a motor (1), and a damping control section (500). The damping control section (500) includes a first high-pass filter (50f) that is input with a motor speed signal that is a speed of the motor (1), and outputs a first signal, a second high-pass filter (50d) that is input with an estimated motor speed signal obtained from the first torque command signal, and outputs a second signal, and a low-pass filter (50g) that is input with a motor speed deviation signal that is a deviation between the first signal and the second signal, acquires a low-frequency component from the motor speed deviation signal, and outputs as a third signal.

The objective of the present invention is to provide a chassis dynamometer that suppresses resonance and vibration phenomena, without changing the mechanical structure of the chassis dynamometer. An inverter (4) of a chassis dynamometer (1) according to the present disclosure includes: a notch filter (40) that attenuates a signal in an attenuation target frequency band including the mechanical natural frequency of the chassis dynamometer 1, from a rotation command signal (S3), and outputs a rotation command signal (S3A); a secondary HPF (45) that passes signals in a high-frequency band including the mechanical natural frequency, among an encode signal (S7), to obtain an encode signal (S7A); a subtractor (47B) that subtracts the encode signal (S7A) from the rotation command signal (S3A) to obtain a rotation command signal (S3B); and a roller drive control unit (RC) that generates a drive control signal (S4) on the basis of the rotation command signal (S3B).

This coupler comprises: a first line (11) that transmits power signals; a second line (12) that is configured so as to be capable of being electromagnetically coupled to the first line (11) and extracts a first power signal from among the power signals transmitted through the first line (11); an input port (P1) that is provided on one end side of the first line (11) and inputs the power signals to the first line (11); an output port (P2) that is provided on the other end side of the first line (11) and outputs a second power signal from among the power signals transmitted through the first line (11); a coupling port (P3) that is provided on one end side of the second line (12) and outputs the first power signal transmitted through the second line (12); a terminated port (P4) that is provided on the other end side of the second line (12) and terminated; and one or more filters that are connected in series to the first line (11) and include a low-pass filter or a high-pass filter.

The application discloses a decision feedback equalizer for PAM4 encoding band infinite impulse response filter, belongs to the field of signal processing, and comprises a high-pass filter and a linear equalizer, a decision feedback adder, and an infinite impulse response filter coefficient feedback control module; noise filtering is performed on a high-speed signal, low-frequency attenuation of the high-speed signal is compensated, a tailing effect in a frequency response is eliminated, high-speed inter-symbol interference is suppressed and eliminated, and an offline post-cursor in the frequency response is fed back and compensated; meanwhile, aiming at PAM4 encoded data, an RLM (Level separation mismatch ratio) calibration module and a clock data recovery circuit are added, which are used for improving the speed of clock receiving and recovery, and due to the addition of more high-speed modules, the load of the equalization adder is increased; the application uses a layout planning of a double-difference six-port mutual inductance bridge type (T-coil) inductive network, and bandwidth is expanded by using inductive peaking technology.

Example systems, devices, and techniques are disclosed for frequency-based determination of oversensing. An example system includes an implantable medical device (IMD) including sensing circuitry configured to sense a cardiac electrogram (EGM) of a patient. The IMD includes processing circuitry configured to obtain the cardiac EGM of the patient. The processing circuitry is configured to determine a suspected arrhythmia episode based on the cardiac EGM. The processing circuitry is configured to apply a high pass filter to the cardiac EGM to generate a high pass filtered EGM. The processing circuitry is configured to classify, based on the cardiac EGM and the high pass filtered EGM, the suspected arrhythmia episode as a true arrhythmia episode or a false arrhythmia episode due to oversensing.

To provide an impedance converter capable of obtaining satisfactory characteristics in a wide band.SOLUTION: With the impedance converter 1 in which the low-band impedance converting circuit 12 and the high-band impedance converting circuit 11 are connected in parallel between the input terminal IN and the output terminal OUT, and with a circuit configuration in which the phase of the pass characteristic of the high-pass filter formed by the high-band impedance converting circuit 11 is delayed with respect to the phase of the pass characteristic of the low-pass filter formed by the low-band impedance converting circuit 12, the phases of the pass characteristics can be matched when the frequency bands are combined. As a result, an impedance converter having favorable impedance conversion performance in a wide band is realized.SELECTED DRAWING: Figure 1

Bandpass filtering circuit This description relates to a bandpass filtering circuit (100) comprising, in series, a first high-pass filter (HPF110), a bandpass filter (BPF100) and a second high-pass filter (HPF120), in which the bandpass filter (BPF100) comprises: - first and second acoustic resonators (AWR101, AWR102) arranged in series between first and second nodes (N102, N103); - two first coils (LBPF101, LBF102) arranged in series with each other, and arranged in parallel with said first acoustic resonator (AWR101); - two second coils (LBPF103, LBF104) arranged in series with each other, and arranged in parallel with said second acoustic resonator (AWR102); - a third acoustic resonator (AWR103) arranged between a third node (N105) midway between the said first coils (LBPF101, LBF102) and a fourth node (GND100);and - a fourth acoustic resonator (AWR104) disposed between a fifth node (N106) midway between said second coils (LBPF103, LBF104) and said fourth node (GND100). Figure for the abbreviation: Fig. 1;

The utility model discloses a kind of multistage electrostatic and overload protection circuit of IOT receiving LNA, belong to internet of things technical field, comprising: setting radio frequency signal main link, high pass filter, amplitude limiter and coupler are connected in series on it;The input end of radio frequency switch is connected with coupler, its first output end connects LNA, second output end connects bypass channel;Dynamic control loop monitors the signal power of main link in real time through coupler, when power is over-limit, the micro control unit in this loop will output control signal, on the one hand drive radio frequency switch switch signal from LNA channel to bypass channel, on the other hand simultaneously shut off the power supply of LNA.The utility model realizes quick, comprehensive overload protection to LNA by the double synergistic action of signal channel switching and power off, and combines the innovative π type ESD protection network, under the premise of not affecting signal quality, greatly improve the reliability of IOT equipment in complex electromagnetic environment.

A control device, an electric power steering device, and a control method, the control device having: a reaction force control section that generates an input torque input to a control object and controls a reaction force transmitted to a steering operator; and an assist control section that generates a correction torque that corrects the input torque based on an output of the control object and a nominal model. The assist control section has: a high-pass filter having a first cutoff frequency; a low-pass filter having a second cutoff frequency higher than the first cutoff frequency; and a disturbance compensation value calculation section that, when a transfer function of the low-pass filter is Q(s) and a transfer function of the high-pass filter is HPF(s), restricts a transfer function of the control object to a transfer function of the nominal model in a frequency band in which a gain of a gain characteristic of Q(s)·HPF(s) is 1. The disturbance compensation value calculation section calculates a disturbance compensation value that compensates for at least a part of an automatic return torque generated in the control object. The correction torque includes the disturbance compensation value.

The embodiment of the invention discloses a rotating speed measuring method, device and equipment for an underground drilling tool and a medium. The method comprises the following steps: acquiring previous sensor data and current sensor data of a target drilling tool; wherein the sensor is a two-axis fluxgate sensor which is installed in a directional sensor in a target drilling tool in advance; performing filtering processing on the previous sensor data based on a high-pass filter to obtain previous filtering data; determining current filtering data of the target drilling tool according to the high-pass filter, the previous sensor data, the current sensor data and the previous filtering data; and determining the rotating speed of the target drilling tool according to the high-pass filter, the current sensor data and the current filtering data. According to the technical scheme, high-precision measurement of the rotating speed of the drilling tool can be achieved directly based on the two-axis fluxgate in the directional sensor of the while-drilling system, the real-time performance is high, the application range is wide, other extra hardware support is not needed, the measurement cost can be reduced, and the measurement efficiency can be improved.

The invention relates to a method for operating a loudspeaker, in particular a moving-coil loudspeaker, in which a signal used to generate sound is linearized by the loudspeaker. According to the invention, the signal is filtered in a frequency-dependent manner, and only a filtered portion of the signal is linearized. Advantageously, the signal is filtered by means of a high-pass and / or a low-pass filter. In one embodiment of the invention, only the portion of the signal output by the low-pass filter is linearized.