82 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.

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.

The invention discloses a control method and system for a hybrid active power filter and a storage medium, and the method comprises the steps: taking an inductance value and a capacitance value of a passive power filter as the input of a particle swarm optimization method, and obtaining an optimized inductance value and an optimized capacitance value; when the harmonic wave frequency filtered by the passive power filter is the same as the harmonic wave frequency 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, enabling the active power filter to be equivalent to a virtual resistor; obtaining a harmonic compensation current reference value of the active power filter; and superposing the harmonic compensation current reference value and the reactive compensation current reference value to obtain the total reference current of the active power filter, taking the total reference current as the input of a proportional resonance controller, and performing PWM modulation on the output of the proportional resonance controller. According to the invention, the harmonic current amplification problem of the passive power filter is eliminated, and the stability and compensation performance of a power system are improved.

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.

The invention discloses a hybrid active power filter system harmonic suppression method and system, and the method comprises the steps: taking the size of load harmonic and the impedance of a power grid as the input of a particle swarm optimization method, and obtaining the optimal value of a passive power filter capacitor and the optimal value of an inductor; extracting a load harmonic current ILoadh after the capacitance and inductance of the passive power filter are optimized, taking the load harmonic current ILoadh as the input of a repetitive controller and an additional damping controller, and superposing the output of the repetitive controller and the output of the additional damping controller to obtain a final harmonic compensation reference current Icxref of the active power filter; and taking the harmonic compensation reference current Icxref of the active power filter as the input of a proportional resonance controller, performing PWM (Pulse Width Modulation) on the output of the proportional resonance controller, generating a driving signal, and controlling the on-off of a switching tube of the active power filter. Harmonic amplification can be effectively eliminated, fundamental frequency resonance is suppressed, and the overall performance is improved.

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 provides a DC-DC-based high-voltage direct-hanging energy storage system 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 into a middle-high voltage power grid in a cascade connection mode, and the power modules are connected into the middle-high voltage power grid in a cascade connection mode. An isolation topology module is connected in parallel between the battery pack and the power module; the isolation topology module comprises a common mode inductor # imgabs0 # and a current stabilization unit; the first end of the common mode inductor # imgabs 1 # is connected with the battery pack, the second end of the common mode inductor # imgabs 2 # is connected with the first end of the current stabilization unit, and the second end of the current stabilization unit is connected with the power module. Through the isolation topology module, common-mode interference is effectively suppressed, secondary pulsating current can be effectively absorbed, and through an LC passive filter composed of a common-mode inductor # imgabs3 # and a direct-current voltage-stabilizing capacitor C1, the problems of common-mode interference and secondary pulsating current brought by parasitic parameters of the cable are more effectively suppressed.

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.

The present disclosure provides a passive filter and a method for manufacturing the same, belonging to the field of radio frequency device technology. The present disclosure provides a passive filter comprising: a dielectric substrate, at least one capacitor, and at least one inductor; the capacitor comprising a first plate, a first interlayer dielectric layer, and a second plate, arranged in sequence, facing away from the dielectric substrate; wherein the dielectric constant of the first interlayer dielectric material changes with changes in the electrostatic field between the first plate and the second plate.

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 headphone set includes a novel passive filter for processing an audio signal. The filter circuit uses three major sections. A parallel resistor and capacitor in series with the speaker, a series capacitor and resistor in parallel with the speaker, and a series inductor and capacitor in parallel with the speaker, with values changing relative to the combined impedance of the first two sections. The first section serves as a controlled high pass filter and the second section serves as a controlled low pass filter. The third section reduces overall impedance in order to reduce differences between the lowest and highest impedance on the spectrum established by the first two sections in order to maintain a consistent response across amplifiers which would otherwise have a more drastic effect on the filter values due to highly variable impedance being affected by an amplifiers output load.

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.

Inverter circuit (100) for operating an electric machine of a drive train of an electrically operable vehicle, at least comprising - a first input terminal (10) for a positive input DC voltage (DC+) and a second input terminal (12) for a negative input DC voltage (DC-), - a neutral point (14) which is electrically connected to the first input terminal (10) via a capacitor (44) and to the second input terminal (12) via a further capacitor (46), - an output terminal (16) for outputting an alternating voltage (AC), - a main current path (20) with two main switches (22, 24), each of which is electrically connected with one terminal to the first input terminal (10) or the second input terminal (12) and with the other terminal together to the output terminal (16), - a secondary current path (30) with two secondary switches (32, 36) arranged in a T-shape to the main switches (22, 24), which are electrically connected to a common central terminal (15), wherein the secondary current path (30) is electrically connected on the one hand to the neutral point (14) and on the other hand to the output terminal (16), wherein the central terminal (15) is damped by a passive filter (40), characterized in that the passive filter (40) has a first filter branch with a resistor (42) connected in series with a capacitor (44) and a second filter branch with a resistor (48) connected in series with a capacitor (46), the first and second filter branches being connected in series, wherein the first filter branch is electrically coupled between the first input terminal (10) and the center terminal (15) and the second filter branch is electrically coupled between the center terminal (15) and the second input terminal (12).

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.