52 results about "Passive power filter" patented technology

The various implementations described herein include techniques and apparatuses for multi-channel biopotential signal acquisition, biopotential signal pre-processing, and adaptive signal conditioning. In one aspect, an analog frontend circuit includes an instrumentation amplifier (INA) and an analog-to-digital circuit (ADC) in a forward signal path. A digital circuit receives input from the ADC. An adaptive baseline tracking and compensation circuit tracks and compensates moving motion artifact driven changes. A power line interference (PLI) detection and compensation circuit tracks a desired number of PLI harmonics, and magnitude, phase and frequency for the PLI harmonics in real time. A digital-to-analog converter (DAC) circuit combines output of the adaptive baseline tracking and compensation circuit and the PLI detection and compensation circuit to output an analog output. A passive filter receives the analog output and drives an analog compensation signal at an input of the INA.

The invention relates to the technical field of servo control, in particular to a servo driving current harmonic compensation method and system for electromagnetic interference suppression. The method comprises the following steps: extracting common-mode and differential-mode interference by using current and voltage sampling and combining differential measurement, and configuring a multi-stage passive filter according to spectrum characteristics to construct a suppression channel; establishing a digital interference cancellation mechanism, generating a reverse compensation signal by adopting self-adaptive trapped wave and a DSP (Digital Signal Processor), and injecting the reverse compensation signal into a control loop to form a software-defined multi-channel suppression architecture; after interference suppression, a high-order tensor model is constructed for the purified three-phase current, and an alternating least square method is adopted for decomposition so as to separate multi-band harmonic waves; a graph neural network is introduced, harmonic coupling is represented, and dominant and residual harmonic decoupling is realized through message passing; according to a grading progressive strategy, dominant harmonic waves are firstly subjected to coarse compensation, then residual harmonic waves are finely adjusted, and a compensation sequence is adaptively optimized through iterative feedback, so that high-robustness closed-loop control of servo driving is realized.

The various implementations described herein include techniques and apparatuses for multi-channel biopotential signal acquisition, biopotential signal pre-processing, and adaptive signal conditioning. In one aspect, an analog frontend circuit includes an instrumentation amplifier (INA) and an analog-to-digital circuit (ADC) in a forward signal path. A digital circuit receives input from the ADC. An adaptive baseline tracking and compensation circuit tracks and compensates moving motion artifact driven changes. A power line interference (PLI) detection and compensation circuit tracks a desired number of PLI harmonics, and magnitude, phase and frequency for the PLI harmonics in real time. A digital-to-analog converter (DAC) circuit combines output of the adaptive baseline tracking and compensation circuit and the PLI detection and compensation circuit to output an analog output. A passive filter receives the analog output and drives an analog compensation signal at an input of the INA.

Provided in the embodiments of the present application are a signal processing method, circuit and chip and an electronic device. The signal processing method comprises: performing PWM modulation on an input signal to obtain a PWM positive signal and a PWM negative signal; and, on the basis of the PWM positive signal and the PWM negative signal, outputting a positive output signal and a negative output signal, wherein in response to the amplitude of the input signal being not equal to 0, the positive output signal and the negative output signal each comprise two pulses in one pulse period. The present solution can reduce the frequency requirements for passive filters processing positive output signals and negative output signals, thereby reducing the cost of signal processing systems.

This invention discloses an adjustable frequency response microphone integrating XLR and USB outputs, comprising a microphone body, a dynamic microphone driver, a passive filter, a pass-through / preamp circuit, an XLR XLR interface, a USB module, and a function control circuit. The passive filter employs an LC circuit structure, supporting three frequency modes: low-frequency cutoff, mid-frequency boost, and flat response, effectively filtering out ambient noise and enhancing vocal quality. The pass-through / preamp circuit offers both pass-through and preamp modes, with adjustable preamp gain to accommodate dynamic microphone drivers of varying sensitivities, and can be externally or internally powered by phantom power. The USB module integrates a Type-C interface and an audio chip, supporting analog-to-digital / digital-to-analog conversion, real-time headphone monitoring, and external power supply. The function control circuit integrates an encoder and a touch panel, enabling adjustments such as volume, mixing, and mute, and enhances the interactive experience with an RGB lighting module. This invention combines the advantages of professional XLR output with convenient USB output, making it suitable for professional recording, live streaming, gaming, and other scenarios.

The invention provides a multi-tuning composite passive filtering device and an intelligent switching control system and method thereof, and belongs to the field of passive filtering. The device comprises a plurality of groups of single-tuned filters and a group of C-type filters which are connected in parallel to a traction network, the front end of each branch is provided with a fling-cut switch which is used for cooperatively inhibiting multi-frequency harmonic waves and providing reactive compensation, and the system is used for controlling the switching of passive filters of each branch. By collecting system voltage, current of each branch, element temperature and switching state in real time and utilizing a digital signal processor to carry out fast Fourier transform and comprehensive state diagnosis, faults such as detuning, failure and overload of filter branches and the change trend of system harmonic waves can be intelligently judged; based on a diagnosis result, the system can automatically execute a protective removal or optimization switching strategy; according to the invention, upgrading from passive filtering to active early warning and intelligent treatment is realized, and the problem of system resonance risk possibly caused by filter performance reduction and continuous access is fundamentally solved.

This invention proposes a design method for a full-band compact hybrid EMI filter circuit based on current feedback. The method includes: constructing an electromagnetic interference test circuit to obtain the common-mode EMI spectrum required for attenuation by the PWM converter, and establishing a high-frequency equivalent circuit for the PWM converter; obtaining the optimal hybrid EMI filter topology based on the high-frequency equivalent models of active and passive EMI filter circuits and the noise attenuation characteristics of the hybrid EMI filter circuit topology; designing the active EMI filter topology and its high-frequency equivalent model based on the noise cancellation principle of the active EMI filter and the common-mode EMI spectrum; designing the active EMI filter topology based on the noise cancellation principle of the active EMI filter and the common-mode EMI spectrum; designing the passive EMI filter structure based on the common-mode EMI noise spectrum after adding the active EMI filter; and designing the hybrid EMI filter circuit based on the hybrid EMI filter topology, the active EMI filter topology, the passive EMI filter structure, and the high-frequency equivalent models of the active and passive EMI filter circuits.

An analog filter circuit includes an active filter configured to filter a transmission signal, the active filter including an active element to which a power supply voltage is applied, and a passive filter connected to an output terminal of the active filter, the passive filter including a passive element having a dynamically variable impedance.

The application provides a high-voltage direct-hanging energy storage system based on DC-DC and a control method thereof, and belongs to the technical field of high-voltage direct-hanging energy storage systems. The system comprises a plurality of battery packs and a plurality of power modules. The battery packs and the power modules are connected in a cascaded form to a medium-high voltage power grid. An isolation topology module is connected in parallel between the battery packs and the power modules. The isolation topology module comprises a common-mode inductor and a current stabilizing unit. A first end of the common-mode inductor is connected to a battery pack, a second end of the common-mode inductor is connected to a first end of the current stabilizing unit, and a second end of the current stabilizing unit is connected to a power module. Through the isolation topology module, common-mode interference is effectively suppressed, and secondary pulsating current can be effectively absorbed. Through an LC passive filter composed of the common-mode inductor and a direct-current voltage stabilizing capacitor C1, common-mode interference and secondary pulsating current problems caused by cable parasitic parameters are more effectively suppressed.

The application discloses a control method and system of a hybrid active power filter and a storage medium, wherein the inductance value and the capacitance value of a passive power filter are taken as inputs of a particle swarm optimization method to obtain optimized inductance value and capacitance value; when the harmonic number filtered by the passive power filter is the same as the harmonic number filtered by the active power filter, the active power filter is equivalent to a virtual LC filter with the same structure as the passive power filter; otherwise, the active power filter is equivalent to a virtual resistor; a harmonic compensation current reference value of the active power filter is obtained; the harmonic compensation current reference value and a reactive compensation current reference value are superimposed to obtain a total reference current of the active power filter, and the total reference current is taken as an input of a proportional resonant controller, and the output of the proportional resonant controller is PWM modulated. The application eliminates the harmonic current amplification problem of the passive power filter and improves the stability and compensation performance of the power system.

Provided in the embodiments of the present application are a signal processing method, circuit and chip, and an electronic device. The signal processing method comprises: performing PWM on an input signal to obtain a PWM positive signal and a PWM negative signal; and outputting a positive output signal and a negative output signal on the basis of the PWM positive signal and the PWM negative signal, wherein in response to the absolute value of the amplitude of the input signal being greater than 0 and less than a first threshold, both the positive output signal and the negative output signal comprise two pulses within one pulse period, and the pulse widths of the pulses included in the positive output signal and the negative output signal are different. The present solution can reduce the frequency requirements of a passive filter for processing positive output signals and negative output signals, thereby reducing the costs of signal processing systems.

The embodiment of the invention provides a signal processing method and circuit, a chip and electronic equipment, and the method comprises the steps: carrying out the PWM modulation of an input signal, and obtaining a PWM positive signal and a PWM negative signal; outputting a positive output signal and a negative output signal according to the PWM positive signal and the PWM negative signal; wherein in response to the fact that the absolute value of the amplitude of the input signal is larger than 0 and smaller than a first threshold value, the positive output signal and the negative output signal both comprise two pulses in one pulse period, and the pulse widths of the pulses included in the positive output signal and the negative output signal are different. According to the scheme, the frequency requirement of the passive filter for processing the positive output signal and the negative output signal can be reduced, so that the cost of a signal processing system is reduced.

A method and apparatus for converting an input frequency to a voltage signal using a passive band-pass filter. The method includes providing an input signal having a specified frequency and amplitude to a passive band-pass filter. The method also includes obtaining an attenuated signal corresponding to the input signal from the passive band-pass filter. The method also includes providing the attenuated signal to a peak detector to obtain a direct current (DC) signal having an output voltage proportional to the specified frequency. The passive circuitry includes a first circuit to receive an input signal having a specified frequency and amplitude, and output an attenuated signal corresponding to the input signal. The passive circuitry also includes a second circuit to convert the attenuated signal to a DC signal having an output voltage proportional to the specified frequency.

A converter with lower passive filter size and increased flying capacitor charging speed during the converter start-up uses a combination of a multi-level power converter circuit having a flying capacitor in which the first switching harmonic cluster is at twice the switching frequency and an integrated double-stage filter designed to allow the flying capacitor to be efficiently balanced and to allow noise from the harmonic clusters and from switches in the power converter circuit to be suppressed. This provides for a compact power conversion apparatus.

The invention provides a new energy transient overvoltage control method, device and equipment and a storage medium, the method is applied to a controller of a power supply system, a networking SVG connected with the controller in the power supply system is connected with a new energy power supply system through a passive filter, and the method comprises the following steps: determining a virtual synchronization phase angle according to a power synchronization loop of the networking SVG; establishing a dq rotating coordinate system based on the virtual synchronous phase angle; if it is determined that the new energy power supply system enters a transient overvoltage state according to the collected three-phase voltage, the dq rotating coordinate system and a preset voltage threshold value, a d-axis reference current and a q-axis reference current are determined according to the three-phase voltage and a dq-axis cross control strategy; and performing space vector pulse width modulation based on the d-axis reference current and the q-axis reference current, and determining a control signal for controlling the network-forming SVG. According to the invention, the new energy power supply system can be timely determined to enter the transient overvoltage state and controlled, and the safety is improved.

The application relates to the technical field of power grid electric energy, in particular to a passive power filter for a power grid electric energy quality active defense system, which comprises an outer box body, a filter unit and a bottom control frame are arranged in the outer box body, the bottom control frame is connected below the filter unit, the bottom control frame comprises a bracket, a walking frame, a heat conduction plate and a thermal control device, the bracket is fixed on the inner wall of the outer box body, the walking frame is connected above the bracket, and the heat conduction plate is fixed above the walking frame, the design of the bottom control frame realizes the multi-control effect on the filter unit, the filter unit can be conveniently disassembled and assembled on the outer box body, and the quality of power maintenance work is improved; in addition, a mechanical temperature control real-time monitoring device is arranged in the walking frame, compared with the temperature monitoring of electronic instruments in the traditional technology, the mechanical temperature control device can directly reduce the economic investment cost in the power grid electric energy by replacing the electronic instruments.

Method for functional testing of a filter (2), preferably a high-frequency filter or an EMC filter, in particular a common-mode filter and / or a differential-mode filter, and wherein the filter (2) comprises an active filter and / or a passive filter and / or a digital filter, and wherein the filter (2) is arranged in or on a power supply line, preferably installed in a DC network and / or a traction network of a motor vehicle, in order to filter out disturbances, characterized by that a functional detector (3) is arranged at the input and / or output of the filter (2), and that an averaging is carried out with the function detector (3), and that a voltage value is determined by averaging and the determined voltage value is used to assess the functionality of the filter (2) by comparing the voltage value with a threshold value.

The invention relates to the field of power electronic converter control, and discloses a high-power active variable inductor for a speed-adjustable driver and a control method thereof.The high-power active variable inductor comprises a positive inductor and a negative inductor, the positive inductor is a traditional physical inductor, and the negative inductor is obtained through equivalence of a single-phase inverter; by connecting the positive inductor and the negative inductor in parallel, the overall equivalent inductance value is increased, and meanwhile, a wider-range adjusting space is provided, so that a better filtering effect is achieved, the equivalent inductance value can be adjusted in a wide range, the power density is high, implementation is easy, three-phase imbalance can be dealt with, the electric energy quality of a speed-adjustable driver is improved, and the service life of a direct-current side filtering capacitor is prolonged; the problems that a direct-current side passive filter of an existing speed-adjustable driver is heavy, the inductance size of an active capacitor is difficult to reduce, and the adjusting range of an existing active inductor is narrow are effectively solved.

The invention discloses a filtering type reactive power compensation device based on rotating phase-shifting transformers, and the device comprises the components of rotating phase-shifting transformer units which are connected in parallel with a network compensation node and are used for adjusting the relative angle position between rotors of two rotating phase-shifting transformers by driving a servo motor and changing the amplitude of total output voltage after stator windings are connected in series; the passive filter bank unit is used for providing fixed capacitive reactive power; and the energy storage inductance unit is used for regulating and controlling current flowing through an inductor and reactive power absorbed by the inductor according to the amplitude of the total output voltage, so that the total compensation reactive power realizes bidirectional, continuous and stepless regulation between capacitive reactive power and inductive reactive power. The invention further discloses a control method of the filtering type reactive power compensation device based on the rotating phase-shifting transformer. According to the invention, smooth, bidirectional and continuous adjustment of reactive power is realized.

Embodiments of the present disclosure provide a method for signal processing, a circuit for signal processing, a chip for signal processing, and an electronic device. The method for signal processing includes: outputting a positive output signal and a negative output signal based on the PWM positive signal and the PWM negative signal; wherein, in response to an absolute value of an amplitude of the input signal being larger than 0 and smaller than a first threshold, each of the positive output signal and the negative output signal includes 2 pulses within one pulse period, and pulse widths of the pulses included in the positive output signal are different from pulse widths of the pulses included in the negative output signal. This solution can reduce the frequency requirements for a passive filter that processes positive and negative output signals, thereby reducing the costs of the system for signal processing.

The application relates to a control method of a receiving-end tapping switch of an SLCC commutation technology, which comprises the following steps: establishing an equivalent model corresponding to the action of a receiving-end tapping switch according to the topological structure of the SLCC; and calculating the action times of the receiving-end tapping switch according to a set receiving-end tapping switch control strategy. The equivalent model comprises a converter transformer branch and an SVG branch connected with a high-voltage direct-current transmission end; the converter transformer branch and the SVG branch are connected at a grid-connected point; the converter transformer branch comprises an AC power supply Us and an impedance connected with each other; the system reactive power exchange in the converter transformer branch is Qs, the converter transformer reactive power consumption is Qtr, the converter transformer valve side voltage is Uv, and the converter transformer valve side current is Is; the equivalent model further comprises a passive filter branch, the passive filter branch is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf; the capacity of the SVG branch is Qsvg, and the branch current is Isvg. The scheme can achieve the target of reducing the action times of the receiving-end tapping switch.

The application discloses a high-frequency oscillation suppression method and device of an MMC-HVDC system, and belongs to the technical field of flexible direct current power transmission system stability control; in view of the problem that the non-minimum phase characteristic of the MMC is caused by the control link delay, and further causes high-frequency oscillation of 1000-2500 Hz, a high-frequency impedance model of the system containing the delay is constructed, and the oscillation mechanism dominated by the non-minimum phase characteristic is determined; a third-order high-pass filter is connected in parallel with the PCC point of the MMC and the alternating current power grid, filter parameters are optimized, -90° phase compensation is realized in a negative damping interval, and the fundamental active power loss is reduced; the impedance characteristic is researched through an impedance detection method, high-frequency oscillation risk is judged, and remodeling effect is verified to suppress the oscillation; the application fundamentally eliminates the negative damping characteristic of the system, the suppression effect is better than that of a traditional passive filter, the influence on the steady-state and transient-state characteristics of the system is small, the application is suitable for different power grid working conditions, and the engineering practicability is high.

This invention relates to harmonic source tracing in converter stations, specifically to a multi-harmonic source tracing method for converter stations based on filter adaptive switching disturbances. When a passive filter state switch is detected, multiple sets of harmonic voltage phasors and harmonic current phasors are continuously collected in the steady-state intervals before and after the switch. The phasor sequences collected before and after the switch are cross-paired to construct a full-combination sample data. The background harmonic voltage variation coefficient is calculated, and background harmonic voltage stability is verified using a verification threshold. For the full-combination sample data that passes the background harmonic voltage stability verification, a harmonic responsibility quantification index is calculated. For the harmonic responsibility quantification index obtained from multiple passive filter state switches, a weighting factor based on the background harmonic voltage variation coefficient is introduced, and harmonic source tracing is performed by calculating the comprehensive harmonic responsibility quantification index. This invention effectively overcomes the shortcomings of achieving accurate quantitative harmonic source tracing in converter stations under multi-source coupling and dynamic time-varying scenarios.

The invention discloses a high-frequency oscillation suppression method and device of an MMC-HVDC system, and belongs to the technical field of stable control of a flexible direct-current power transmission system. In order to solve the problem of 1000-2500Hz high-frequency oscillation caused by the non-minimum phase characteristic of the MMC caused by control link delay, a system high-frequency impedance model containing delay is constructed, and an oscillation mechanism dominated by the non-minimum phase characteristic is clarified; a third-order high-pass filter is connected in parallel to a PCC point of the MMC and the alternating current power grid, parameters of the filter are optimized to enable the filter to achieve-90-degree phase compensation in a negative damping interval, and meanwhile the active power loss of fundamental waves is reduced; the impedance characteristic is researched through an impedance detection method, the high-frequency oscillation risk is judged, and the remodeling effect is verified to suppress oscillation; the negative damping characteristic of the system is eliminated fundamentally, the suppression effect is better than that of a traditional passive filter, the influence on the steady-state and transient-state characteristics of the system is small, different power grid working conditions are adapted, and the engineering practicability is high.

A noise filter according to the present invention comprises a passive filter (40) that includes a common-mode choke coil (41) and a capacitor (42), a detection unit (150) that detects common-mode noise that occurs at a power line (11) to which the passive filter is connected, an active noise canceller (180) that outputs a compensation signal that reduces the common-mode noise to the power line or a ground (12) on the basis of a signal detected by the detection unit, a first substrate (13) on which the passive filter is installed, and a second substrate (14) on which components of the active noise canceller are installed. The second substrate is fixed to the first substrate.

The utility model relates to the field of traction power supply systems, in particular to a combined passive filter for an electrified railway. A first capacitor and a first inductor form a first circuit; the third capacitor and the second circuit form a second circuit; the sub-circuit comprises a second capacitor, a second inductor and a second resistor, the second capacitor is serially connected with the second inductor, and the serially connected circuit is parallelly connected with the second resistor; the first circuit and the second circuit form a parallel circuit, one end of the parallel circuit is connected to the traction network, and the other end of the parallel circuit is connected with the first resistor in series. According to the utility model, part of passive devices can be shared through the combined passive filter, so that the filtering effect is achieved, the cost is saved, and the occupied area and the maintenance work are reduced.

The invention relates to the technical field of fault prediction, in particular to a conversion fault prediction method and system for a power cabinet, and the method comprises the following steps: collecting the inductance terminal voltage and inductance current of an inductor in the power cabinet, and the input side common-mode current of an EMI filter in the power cabinet; according to the EMI filter health state on-line monitoring method and device, the inherent frequency response characteristic of the passive filter network and the strong correlation between element parameters are utilized, and on-line monitoring of the EMI filter health state is achieved under the condition that power is not needed to be cut off or an excitation source is not needed to be additionally arranged. When the frequency drift exceeds the threshold value, the aging fault is judged, the problem that the filtering failure caused by capacitance attenuation or inductance magnetic conductivity reduction in long-term operation of a passive device is difficult to perceive is solved, the electromagnetic compatibility and the power conversion reliability of a power supply system in the whole life cycle are guaranteed, and the fault prediction precision is improved.

Reduced number of replacement parts required when the active noise canceller malfunctions. [Solution] A noise filter comprising: a passive filter (40) including a common mode choke coil (41) and a capacitor (42); a detection unit (150) for detecting common mode noise generated in a power line (11) to which the passive filter is connected; an active noise canceller (180) for outputting a compensation signal to the power line or ground (12) to reduce the common mode noise based on the signal detected by the detection unit; a first circuit board (13) on which the passive filter is mounted; and a second circuit board (14) on which the components of the active noise canceller are mounted, wherein the second circuit board is fixed to the first circuit board.

This application relates to an energy storage system, a method, apparatus, and electronic equipment for obtaining filter parameters, belonging to the field of power systems. The method includes: obtaining relevant parameters of the energy storage system, including: the operating frequency of the power grid connected to the energy storage system, the current amplitude of the power grid, the modulation ratio of the power grid, and the voltage, current ripple rate, and voltage ripple rate of the sub-modules in the energy storage system; and determining the filter parameters in the correlation relationship based on the relevant parameters and the correlation between the filter parameters in the sub-modules and the relevant parameters. This application employs a passive method using passive filters to suppress ripple current in the energy storage system. Ripple current is suppressed by setting LC filters in the sub-modules, and the parameters of the LC filters in each sub-module are determined based on the relevant parameters of the energy storage system and the correlation relationship between the filter parameters and the relevant parameters. This allows for accurate passive filter parameters to be obtained, thereby accurately suppressing the ripple current in the current energy storage system.