31 results about "Passive filtering" patented technology

The invention discloses a low-noise, high-precision and low-power-consumption tunnel magnetoresistance array type magnetic anomaly detection device, and relates to the field of geomagnetic field magnetic anomaly detection. In order to overcome the defects that in the prior art, the detection precision is insufficient, the noise level is high, power consumption is large, and long-time stable operation is difficult to consider, the technical scheme provided by the invention is that a signal acquisition and amplification circuit is composed of a plurality of triaxial tunnel magnetoresistive sensors, an isolation circuit, an instrument amplification circuit and a passive filter circuit; the master control and signal processing circuit is composed of a high-precision analog-to-digital conversion circuit, a clock circuit and a microprocessor circuit. The signal transmission circuit is composed of an Ethernet module and is used for transmitting the processed data to an upper computer; the power supply module is composed of a low-noise low-dropout voltage stabilizing circuit and a reference voltage circuit, and is used for providing a stable power supply and a unified reference voltage. The method is suitable for long-time high-precision geomagnetic anomaly detection work in geophysical exploration, national defense safety monitoring and complex environments.

The utility model belongs to the technical field of electronic circuit, especially relates to a passive low harmonic frequency converter special for rail transit air conditioner. The frequency converter includes: passive filter module, rectifier module, precharge module, voltage-sharing filter module, inverter module and control module. The input end of passive filter module is connected to the output end of alternating -current source, and the output end is connected to the input end of rectifier module, and the output end of rectifier module is connected to the input end of precharge module, the output end of precharge module is connected to the input end of voltage-sharing filter module, the output end of voltage-sharing filter module is connected to the input end of inverter module, and the output end of inverter module is the voltage output end of passive low harmonic frequency converter special for rail transit air conditioner, and inverter module and control module are connected through inverter control and protection circuit. The utility model can reduce the harmonic interference of frequency converter inverter to input power grid, protects the electrical equipment on power grid, and improves the security of operation.

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.

The application discloses a boost circuit capable of realizing adjustable charging and discharging frequency, comprising a charging and discharging circuit main body, three groups of optional passive RC filter circuits, a secondary passive filter and source follower circuit, a combination logic and differential pulse generation circuit and a negative feedback circuit. The charging and discharging circuit main body comprises two sub-circuits, the three groups of optional filter circuits are combined by switches and resistors and capacitors, and the negative feedback circuit controls the differential pulse signal by a comparator to adjust the charging and discharging. The circuit can realize the switching of three charging and discharging frequencies of 30 MHz, 100 MHz and 400 MHz, is stably boosted to 1.6 V-2.2 V, effectively controls dynamic noise and is suitable for application scenarios of low power supply voltage.

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.

The present invention provides an air conditioning apparatus provided with a radar sensor and a processing device, the air conditioning apparatus comprising: an active intervention module comprising: a passive filtering unit configured to filter coarse interference in detection data; the coarse interference comprises that the movement information coordinate exceeds a preset physical area, the collection time of the movement information exceeds a preset activity time period, and / or the movement information track exceeds a moving object of a preset track area, and establishing an original data set; the collection unit is configured to allocate suspiciousness for areas in the air-conditioned room based on the motion trail of the moving object in the original data set, and establish a suspicious area set according to a suspiciousness preset condition; the active filtering unit is configured to supply air to the suspicious area set when the moving object is not detected, and judge the moving object detected under the air supply condition as a passive interference source; and the active filtering unit takes the moving object after the passive interference source is filtered as an effective element. The method can improve the long-term accuracy of detection.

The invention discloses an intelligent self-cleaning oil smoke interception system based on a bionic cilium array, which realizes graded efficient interception of oil smoke particles through the bionic multi-stage cilium array, and integrates intelligent control modules for self-adaptive vibration cleaning, cilium surface functional modification and airflow and temperature collaborative sensing. The system can sense the oil smoke load and cilium pollution state in real time and dynamically adjust the cleaning strategy; a micro-nano composite structure super-oleophobic coating is constructed on the surface of the cilia; and meanwhile, auxiliary electrostatic adsorption and a local heat energy field are introduced, so that the capture rate of ultrafine particles is remarkably increased, and oil drop desorption is accelerated. The interception efficiency, the self-cleaning capability and the intelligence are remarkably improved, and the passive filtering mode of a traditional range hood is thoroughly changed.

The invention provides a signal processing method, a controller and a building control system, and relates to the technical field of building control. The method comprises the following steps: receiving a to-be-processed signal of a sensor, wherein the to-be-processed signal comprises a target signal and an interference signal collected by the sensor; analyzing the to-be-processed signal to determine an interference signal feature in the to-be-processed signal, the interference signal feature in the to-be-processed signal including at least one of a peak fluctuation feature and a waveform similarity feature; judging whether the to-be-processed signal contains a periodic interference signal or not according to the interference signal characteristics in the to-be-processed signal; and under the condition that the to-be-processed signal contains the periodic interference signal, the filter circuit is regulated and controlled according to the characteristics of the periodic interference signal. Through the method, the interference signal of the sensor signal can be accurately identified in real time, and filtering is performed in a targeted manner, so that the problems of sensor signal loss and non-ideal filtering effect caused by passive filtering can be solved.

The invention provides a high-resolution double-beam fundamental transverse mode semiconductor laser chip, and relates to the technical field of semiconductor lasers. The high-resolution double-beam fundamental transverse mode semiconductor laser chip comprises a chip body, and a first ridge-type waveguide and a second ridge-type waveguide are formed on the upper side of the chip body through one-time etching. Each of the first ridge waveguide and the second ridge waveguide sequentially comprises an active oscillation waveguide area, a passive filtering waveguide area and an active amplification waveguide area in the light emitting direction. The first ridge-type waveguide and the second ridge-type waveguide intersect, and the intersection point is located in the passive filtering waveguide area. And the upper side surfaces of the active oscillation waveguide region and the active amplification waveguide region are provided with P-plane metal connected with the electrodes. An insulating layer is arranged on the upper side face of the chip body, and the P-face metal is exposed outside through an avoiding notch in the insulating layer. The output light spot of the chip is a pure fundamental mode light spot, so that the resolution of the printer can be effectively improved.

This application provides an integrated passive filter circuit, including two first filter units, two second filter units, and a third filter unit. Each filter unit includes a main path and a grounding element connected to the main path. The two second filter units are symmetrical with respect to the third filter unit. The two first filter units are symmetrical with respect to the two second and third filter units. The end of the main path of the first filter unit serves as the port of the integrated passive filter circuit. The third filter unit includes two parallel and different grounding elements. The solution provided in this application employs a semi-symmetrical structure design. The symmetrical structure on both sides effectively improves the consistency at both ends of the filter and simplifies the adjustment of the reflection characteristics on both sides of the device. The asymmetrical structure in the middle improves out-of-band rejection on both sides, reduces the number of devices, and lowers device insertion loss.

The invention discloses an intelligent cooperative harmonic suppression method and related equipment, and the method comprises the steps: obtaining a voltage signal and a current signal, and carrying out the preprocessing, and obtaining the preprocessing data; performing spectrum analysis on the preprocessed data to obtain spectrum data of a plurality of harmonic waves; based on the frequency spectrum data, determining governance weights corresponding to the passive filtering unit, the active filtering unit and the reactor unit respectively; and based on the governance weight, respectively adjusting a capacitance parameter of the passive filter unit, a compensation current parameter of the active filter unit and an impedance parameter of the reactor unit. According to the invention, harmonic wave coverage in a wide frequency range is realized through an intelligent adaptive filtering mode, load fluctuation and power grid frequency deviation are adapted, the harmonic wave treatment effect is more stable, the defects of a traditional harmonic wave treatment technology in coverage range, scene adaptability and volume cost are overcome, and harmonic wave treatment requirements of different scenes can be met.

The invention provides a non-isolated unidirectional Boost converter and a coupling inductor design method thereof, the converter comprises a coupling inductor unit, a primary winding of the coupling inductor unit is used as an excitation inductor of the converter, and a secondary winding of the coupling inductor unit is connected in series with an auxiliary capacitor to form a passive filter branch; wherein the passive filtering branch is connected with an input power supply in parallel; the converter is configured to enable current flowing through the excitation inductor to flow bidirectionally by controlling alternate on-off of the first switch tube and the second switch tube, so that zero-voltage switching-on of the first switch tube or the second switch tube is realized; the passive filtering branch is configured to generate filtering current with the phase opposite to that of a current ripple component of the excitation inductor through the coupling effect of the coupling inductor unit; the filtered current is superimposed with the current ripple component to counteract the ripple of the input current. Zero input current ripples are realized while zero-voltage switching of the switching tube is realized.

An active filter, system, chip and electronic device, comprising: an input end of an RC filter module receives a to-be-filtered signal of the active filter to passively filter the to-be-filtered signal to obtain a passively filtered signal; an output end of a voltage follower module outputs a voltage following the rise and fall of the passively filtered signal to obtain a voltage following signal; a flip voltage follower module makes the filter output end output a voltage following the rise and fall of the voltage following signal to obtain an actively filtered signal; the filter output end is an output end of the active filter; a positive feedback module is connected between the filter output end and the RC filter module, and when the frequency of the to-be-filtered signal falls within a preset cutoff range, the positive feedback module is used to feed back the actively filtered signal to the RC filter module. By setting the flip voltage follower module, the output impedance of the active filter is reduced, so that the active filter can be applied to a high-frequency scene.

This invention discloses an ultra-high frequency harmonic dynamic control system and method based on adaptive control, belonging to the field of adaptive control technology. The invention acquires ultra-high frequency harmonic signals and divides them into several independent frequency bands, obtaining the occurrence time and duration of each band to form the frequency of harmonic occurrence per unit time. The K-nearest neighbor algorithm is used to analyze this frequency, outputting frequency band classification results and assigning corresponding filtering modes to each band, then executing filtering. The frequency of occurrence per unit time for each band is updated, and the classification status change is compared with the target threshold. The operational stability of passive and active filtering is calculated, and the filtering effect deviation is further calculated. Based on both, a switching command is output. Switching to active filtering disconnects the corresponding passive branch, adjusts the active filtering parameters, and includes it in the control scope. Switching to passive filtering activates the corresponding branch, adjusts the parameters, and removes the frequency band from the active filtering range.

This invention discloses a method and system for suppressing second-harmonic voltage ripple in power electronic transformers based on virtual parallel impedance, aiming to solve the problem of excessive voltage ripple in submodule capacitors of common-frequency chain power electronic transformers. Without adding additional passive filtering components or active power decoupling circuits, virtual parallel impedance feedforward control is introduced into the primary-side port voltage control loop of the isolation-stage modular multi-active bridge converter to reshape the closed-loop input impedance characteristics of the port. A bandpass filter is used to extract the second-harmonic voltage component, and a virtual admittance gain is applied to make the converter port exhibit low impedance characteristics at second-harmonic frequency, thereby guiding fluctuating power to preferentially flow to the common high-frequency AC bus. The natural coupling cancellation effect of three-phase fluctuating power at the bus significantly suppresses voltage ripple on the DC capacitor. This invention requires no additional hardware, effectively reducing the demand for capacitor values ​​and improving the power density and operational reliability of the transformer system.

The invention relates to a multi-channel analog signal output module. The multi-channel analog signal output module comprises a main control module, a current output module and a communication multiplexing module, the communication multiplexing module comprises an isolation transmission unit, a modulation-demodulation circuit and a multiplexing switch unit. The multiplexing switch unit is connected with the modulation-demodulation circuit and an output loop of the current output module through a common bus and a plurality of coupling branches; each coupling branch comprises a gating switch assembly and a passive filtering assembly which are connected in series. The gating switch assembly is controlled to be switched on, and the passive filtering assembly is configured to block the analog current signal and allow the frequency shift keying analog signal to pass through. Through a serial connection structure of the gating switch and the filtering assembly, multiplexing of a single modulation-demodulation circuit on multi-path output is realized, hardware cost is reduced, meanwhile, direct-current high voltage is effectively blocked, switching interference is inhibited, and communication stability and module reliability are improved.

The invention discloses a method for detecting measurement and control signals of an unmanned aerial vehicle in a complex network environment. The method comprises the following steps: step 1, multi-dimensional joint perception and signal representation; the method has the beneficial effects that a dual enhancement mechanism of separation and reinforcement learning dynamic anti-interference guided by physical characteristics is introduced, and normal form transformation from passive filtering to intelligent countermeasure is carried out, so that inherent robustness is improved through physical characteristic constraint on a kernel (separation algorithm); active and strategic anti-interference is realized on the periphery through reinforcement learning, and a deep defense system is formed; meanwhile, a mixed framework with unsupervised clustering pre-screening and physical feature guiding ICA as a main mode and light weight fine tuning as an auxiliary mode is adopted, fusion innovation from data driving to physical knowledge guiding and light weight intelligence is achieved, the core separation process depends on physical attributes and unsupervised learning of signals, and dependence on a large amount of labeled data is greatly reduced.

The application provides a defense device and method for a physical backdoor attack on a biological information recognition system, and belongs to the field of information security. The biological information recognition system is used for collecting multi-modal biological signals and authentication. The defense device comprises: a coupling path blocking module: from active shielding, passive filtering and voltage stabilization, the conduction of malicious noise in the physical connection path is cut off or weakened, and the stability of the front-end physical environment is ensured. A physical domain signal purification module: from real-time monitoring of signals, feature analysis to interference suppression, a closed loop is formed, and the noise transmitted from the power supply circuit to the collection device is reduced. A digital domain semantic verification module: verifies the collected multi-modal biological signals, and judges whether there are abnormal or backdoor injection attack signs. A system control and management module: realizes communication between external devices and each module, and makes decisions according to the digital domain semantic verification result. The application can effectively block the physical interference signals used for injecting backdoors, and ensure the safety and reliability of the biological information recognition system.

The invention relates to a general EMC automatic diagnosis and rectification system. The general EMC automatic diagnosis and rectification system comprises a passive filter network and a band switch connected with the passive filter network, the signal acquisition module is connected with the adjustable passive filtering module; the judgment module is connected with the signal acquisition module and is internally provided with an AI learning type rule base; and the parameter adjusting module is connected with the judgment module and the band switch. The signal acquisition module performs spectral analysis on the EMI filtering signal, the judgment module performs EDA co-simulation based on an AI learning type rule base on spectral characteristics to determine a rectification driving signal, and the parameter adjustment module generates mechanical driving force according to the rectification driving signal to control open circuit and short circuit of the band switch. Therefore, the capacitance value, the inductance value and the resistance value of the passive filter network are adjusted. The problems that existing EMC rectification depends on a test site and manpower, efficiency is low, and accuracy is poor are solved. According to the method, the AI learning type rule base is added, deep learning is carried out through historical rectification cases, and the overall effect is improved.

The application provides a non-isolated one-way Boost converter and a coupled inductor design method thereof. The converter comprises a coupled inductor unit, a primary winding of the coupled inductor unit serving as an excitation inductor of the converter, and a secondary winding of the coupled inductor unit being connected in series with an auxiliary capacitor to form a passive filter branch. The passive filter branch is connected in parallel with an input power supply. The converter is configured to realize zero-voltage turn-on of the first switch tube or the second switch tube by controlling the alternating on-off of the first switch tube and the second switch tube, so that the current flowing through the excitation inductor flows bidirectionally. The passive filter branch is configured to generate a filter current with a phase opposite to a current ripple component of the excitation inductor through the coupling effect of the coupled inductor unit. The filter current and the current ripple component are superposed to offset the ripple of the input current. The application realizes zero-voltage turn-on of the switch tube and zero input current ripple at the same time.

The application discloses an active control method for suppressing secondary ripples on the DC side of a two-stage inverter, and relates to the technical field of new energy power generation. The core characteristic parameters of the secondary ripples on the DC side are accurately and timely captured by a ripple detection module, a dynamic compensation current instruction with opposite phase and matched amplitude is generated by combining a compensation signal generation module, and the dynamic compensation current instruction is superimposed on a current inner loop reference signal through a front-stage DC-DC converter control module, so that the secondary ripples on the DC side are effectively offset, compared with a traditional passive filtering scheme, no additional bulky filtering elements are needed, the system size and cost are reduced, and a higher ripple suppression rate is achieved; a rear-stage inverter coordination module can dynamically respond to the front-stage compensation action, the spectral characteristics of a modulation wave are optimized, the total harmonic distortion rate of the output power on the AC side is ensured to be maintained at a low level, the front-stage module and the rear-stage module are cooperatively worked, and the ripple suppression effect and the power quality are considered.

The invention relates to a self-adaptive windowing differential integration and drift suppression method for an electromagnetic flowmeter. The method comprises the following implementation methods of hardware platform building, an action matching process after hardware platform building and a working process after the action matching process. The FPGA periodically sends out step wave excitation signals according to an excitation period, and an excitation current source is generated through excitation drive to drive an excitation coil; meanwhile, an electrode signal on a measuring pipe assembly mounted on the water pipe firstly enters a first-stage peak suppression, filtering and differential amplification circuit to prevent a first-stage operational amplifier from being saturated, then the signal enters a high-frequency filter to filter out a high-frequency signal and then enters a low-noise differential instrument amplifier, and the signal has a certain amplitude at the moment; then the signals enter an analog switch, and the signals subjected to windowing control of the analog switch enter an ADC for sampling through simple passive rc filtering; and the FPGA carries out I / Q calculation on the sampled data.

The invention relates to the field of power electronic converter control, discloses an ASD complex working condition management method and system based on a high-power active adjustable inductor, and aims to solve the problems of poor dynamic performance and short device service life caused by fixed passive filtering parameters of the ASD under the complex working conditions of three-phase imbalance, load switching, underload, overload and the like. According to the embodiment, an active variable inductor in which a positive inductor (such as a traditional physical inductor) and a negative inductor (equivalent to a single-phase inverter) are connected in parallel is adopted; the working condition state of the ASD at the current moment is recognized, then the negative inductance value is adjusted in a targeted mode, different working conditions are adapted, and the optimal filtering effect is achieved. The management method provided by the embodiment of the invention can flexibly deal with complex working conditions, improve the filtering performance, inhibit the DC side voltage fluctuation, prolong the service life of the capacitor, and improve the ASD power density and the operation reliability at the same time.

The present application belongs to the technical field of power quality optimization, and discloses an M3C output power quality optimization method, system, device and medium, which comprises the following steps: acquiring an M3C output side electric signal in real time and converting it into a sampling sequence, extracting a harmonic error signal from the sampling sequence by using an adaptive filtering algorithm, and dynamically adjusting the step factor of the adaptive filtering algorithm according to the error signal; based on the harmonic error signal, generating a harmonic compensation signal for each bridge arm by using a bridge arm phase coordination strategy and superimposing the harmonic compensation signal on the basic modulation wave of the corresponding bridge arm; converting the modulation wave of each bridge arm after compensation and superposition into a switching driving signal, and realizing harmonic cancellation at the M3C output end by using the spatial phase redundancy between the bridge arms; and using passive filtering technology to assist in filtering the residual high-frequency harmonics in the M3C output waveform after harmonic compensation, so as to realize the optimization of the M3C output power quality. The adaptive harmonic extraction and bridge arm phase coordination compensation mechanism are introduced to realize the optimization of the output power quality.

The present application relates to a kind of reactive compensation and harmonic suppression of photovoltaic grid-connected system device and method, comprising: variable unit, for realizing maximum power tracking control;Inverter unit, for the current circuit of fixed voltage generation of output with grid voltage same frequency, same phase output;Filter unit, for filtering the high-frequency burr caused by switching device on-off to current circuit;Resonance unit, for the passive filter of current circuit after filtering high-frequency burr;Signal acquisition module, for collecting the voltage, current signal of output side circuit as electric signal;Signal conditioning module, for realizing the detection of reactive and harmonic current, and the reactive and harmonic current that need to be compensated are calculated;And with photovoltaic array active component synthesis unified control composite instruction current, form current inner loop control, control the output of inverter unit to obtain the required grid current.The present application can filter the high-frequency burr caused by switching device on-off, effectively overcome the capacity limit of filter unit.

The invention discloses a temperature monitoring method and device, electronic equipment and a storage medium, and belongs to the technical field of control. According to the application, a double-brush grounding topology in which a steam turbine side grounding carbon brush and an exciter shaft head grounding module are connected in parallel is adopted, so that a shaft voltage discharge path is widened; a passive filter circuit composed of a resistor and a capacitor is connected in series in an exciter shaft head grounding loop, high-frequency pulsating voltage generated in the commutation period can be directionally discharged, and a low-impedance channel is provided for high-frequency current pulses. The dual-brush topology and the passive filter circuit cooperate to effectively offset the static excitation system and the superposed shaft voltage, and the shaft voltage is prevented from exceeding a safety threshold. The technical effects of reducing the shaft voltage amplitude to be within the safety threshold range, reducing the insulation breakdown risk of the bearing, guaranteeing the stable operation of the excitation system of the steam turbine generator and prolonging the service life of a unit are achieved.

The invention discloses a hybrid common-mode electromagnetic interference filter and a control method thereof, and belongs to the technical field of power electronics, and the hybrid common-mode electromagnetic interference filter comprises a linear impedance stabilization module, a passive impedance reconstruction module, an active electromagnetic interference filtering module and a conversion module, the output end of the linear impedance stabilization module is connected with the first end of the passive impedance reconstruction module, the second end of the passive impedance reconstruction module is connected with the third end of the passive impedance reconstruction module and the first end of the active electromagnetic interference filtering module, and the fourth end of the passive impedance reconstruction module is connected with the input end of the conversion module. The output end of the conversion module is connected with the output voltage; the passive impedance reconstruction module comprises a common mode inductor, a third inductor and a fourth inductor. According to the invention, the cooperative effect of passive filtering and active compensation is realized through impedance reconstruction, and the broadband suppression capability of common-mode electromagnetic interference and the overall insertion loss performance are effectively improved.

The invention provides an engine ground hot test run pulsating thrust measuring system and measuring method, and solves the problem of insufficient pulsating thrust measuring precision caused by axial and radial component coupling interference of thrust of a test run frame when the test run frame of an engine ground hot test run is mounted on a test bed in a 45-degree inclined manner. Through a force component decomposition algorithm and special sensor layout, lateral force interference caused by 45-degree installation is eliminated, precise separation of pulsating thrust axial components is achieved, and the measurement error is smaller than or equal to + / -0.5%; meanwhile, a Pacif6000 modular acquisition device, an acquisition board card internally carrying n-channel synchronous data, n > = 8 and parameter design are adopted, and a signal conditioning unit externally provided with a double-layer electromagnetic shielding shell and internally connected with an LC passive filtering topology circuit is combined, so that undistorted acquisition of 10-1000Hz pulse signals can be realized, and the sampling rate and the signal bandwidth matching degree can be improved by 30%.

The invention provides a filtering method and device, a computer readable storage medium and a building system, and relates to the technical field of building control. The filtering device comprises a filtering circuit which comprises a plurality of filtering modules which are connected in parallel; the controller is configured to detect a to-be-processed signal of the sensor in a current detection window to determine the characteristic of a periodic interference signal carried by the to-be-processed signal, and the characteristic of the periodic interference signal comprises the period or frequency of the periodic interference signal; determining a filtering module matched with the characteristics of the periodic interference signal from the plurality of filtering modules; and controlling the matched filtering module to work so as to filter the signal to be processed. Through the device, filtering can be performed in a targeted manner according to the identification result of the periodic interference signal carried by the sensor signal, so that the problems of sensor signal loss and non-ideal filtering effect caused by passive filtering can be solved.

The invention discloses a voltage suppression method and device, electronic equipment and a storage medium, and relates to the technical field of control, a double-brush grounding topology in which a steam turbine side grounding carbon brush and an exciter shaft head grounding module are connected in parallel is adopted, and a shaft voltage discharge path is widened; a passive filter circuit composed of a resistor and a capacitor is connected in series in an exciter shaft head grounding loop, high-frequency pulsating voltage generated in the commutation period can be directionally discharged, and a low-impedance channel is provided for high-frequency current pulses. The dual-brush topology and the passive filter circuit cooperate to effectively offset the static excitation system and the superposed shaft voltage, and the shaft voltage is prevented from exceeding a safety threshold. The technical effects of reducing the shaft voltage amplitude to be within the safety threshold range, reducing the insulation breakdown risk of the bearing, guaranteeing the stable operation of the excitation system of the steam turbine generator and prolonging the service life of a unit are achieved.