62 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.

Aspects of this disclosure relate to a parallel hybrid acoustic passive filter. The parallel hybrid acoustic passive filter includes a first sub-filter and a second sub-filter. The first sub-filter includes a first acoustic resonator and a first non-acoustic passive component. The second sub-filter includes a second acoustic resonator and second first non-acoustic passive component. The first sub-filter and the second sub-filter are together arranged to filter a radio frequency signal. The parallel hybrid acoustic filter can be a band pass filter or a band stop filter, for example. Related multiplexers, wireless communication devices, and methods are disclosed.

The invention discloses a magnetic valve type controllable reactor voltage control method for a wind and light collection system based on automatic voltage control. The method comprises the steps that voltage, current, active power and reactive power parameters of the wind and light collection system are collected in real time through an automatic voltage control AVC system; analyzing voltage level and reactive power distribution based on the acquired parameters, comparing with a preset voltage target value to generate a control strategy to preferentially switch a passive filter bank, switching the filter bank when the voltage is lower than a set value, and switching off part of the filter bank when the voltage is higher than the set value and the power quality is allowed; when the compensation capacity of the filter bank is insufficient, reactive output is dynamically adjusted by adjusting the inductance value of the magnetic valve type controllable reactor; according to the method, real-time monitoring and data acquisition and analysis of the wind and light collection system are realized through an automatic voltage control system, so that the switching of a filter is controlled, the inductance value of a magnetic valve type controllable reactor is accurately regulated and controlled, and the stability of system voltage and the optimization of reactive power are ensured.

The present invention relates to the field of electromagnetic compatibility and discloses a simplified circuit design method and system for a high-performance EMC suppression rectifier diode. The method comprises: identifying the interference frequency range of the diode application scenario, determining the passive and active components of the diode application scenario, and establishing a passive filter for the diode application scenario; establishing an active filter for the diode application scenario, combining the passive and active filters to obtain a multi-stage filter; establishing a protection circuit for the multi-stage filter and the target rectifier diode, and constructing a diode integrated circuit comprising the protection circuit, the multi-stage filter, and the target rectifier diode; simulating the diode integrated circuit to obtain EMC suppression data, calculating circuit parameter values ​​of the diode integrated circuit, and performing circuit optimization of the diode integrated circuit to obtain the target integrated circuit. The present invention can improve the EMC suppression effect of the rectifier diode.

The utility model discloses a device for suppressing harmonic waves of a secondary circuit of a wind turbine generator, a fan is electrically connected with a converter, and the converter end is electrically connected to a medium-voltage switch cabinet through a main transformer and is connected to a power grid load through the medium-voltage switch cabinet; the converter end is connected to a secondary loop through an auxiliary transformer; a passive filter is arranged behind the auxiliary transformer; the passive filter comprises a three-phase loop, U1, V1 and W1 of the three-phase loop serve as input ends, U2, V2 and W2 serve as output ends to be connected into the secondary loop, inductors L1, L2 and L3 are arranged in the three-phase loop respectively, and a capacitor C is connected into the three-phase loop in a delta connection mode. The device solves the problem of harmonic waves generated in the application of the converter of the wind turbine generator, can effectively reduce the harmonic waves entering a secondary circuit, and protects secondary circuit equipment.

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.

Circuit diagram, including: a filter circuit with a first port (①) configured to be coupled to an antenna, a second port (②) and a third port (③), wherein the filter circuit comprises the following: a first passive filter (302), a second passive filter (304), a first power amplifier (346) with an output coupled to the first passive filter (302), a second power amplifier (348) with an output coupled to the second passive filter (304), a first coupler (300) with an input port coupled to the first port (①), an isolated port coupled to the second port (②), a first phase-shifted port coupled to the first passive filter (302), and a second phase-shifted port coupled to the second passive filter (304), wherein the first coupler (300) comprises a -3dB hybrid with quadrature output, and a division network (312) with a first output coupled to an input of the first power amplifier (346), a second output coupled to an input of the second power amplifier (348), and an input coupled to the third port(③).

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 provides a high-voltage power supply circuit and high-voltage power supply equipment, and the high-voltage power supply circuit comprises a voltage division circuit which is used for obtaining a voltage input signal, and the voltage input signal comprises an AC signal; the input end of the voltage division circuit is connected in front of a passive filter of the high-voltage power supply circuit; the control circuit is used for processing the alternating current signal and outputting a voltage control signal, the voltage control signal is used for inhibiting the alternating current signal in a voltage output signal, and the high-voltage power supply equipment comprises the high-voltage power supply circuit. According to the high-voltage power supply circuit and the high-voltage power supply equipment provided by the invention, power frequency ripples in a high-voltage power supply can be suppressed under the condition that the size of a device is not increased.

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.