573 results about "Frequency filtering" patented technology

The invention relates to the technical field of concrete performance simulation, in particular to a concrete crack resistance simulation monitoring method, device and equipment and a storage medium. The method comprises the following steps: acquiring a plurality of groups of internal microstructure images; carrying out different component region segmentation on the plurality of groups of internal microstructure images, and carrying out mechanism structure quantitative analysis to generate mechanism structure parameters of different regions; real-time environmental parameter monitoring is carried out on to-be-monitored concrete based on the multiple sensor nodes, and concrete environmental sensing parameters are obtained; performing environmental stress load excavation on the concrete environmental perception parameters to generate concrete environmental stress load characteristics; and performing multi-frequency filtering noise reduction on the internal three-dimensional microstructure image based on the mechanism structure parameters of different regions, performing regional structure three-dimensional point cloud modeling, and constructing a concrete three-dimensional point cloud model. According to the invention, high-precision and high-efficiency simulation of the crack resistance of the concrete is realized.

The present application relates to a switch cabinet discharge fault detection method, system, equipment and medium, belonging to the technical field of power equipment fault detection, the fault detection method includes: receiving real-time monitoring data of the switch cabinet to be monitored and aligning the timestamp; performing dynamic amplitude compensation on the electric field signal data based on the aligned current humidity data, generating the corrected electric field signal data and performing time-frequency domain analysis, extracting the discharge pulse density and high-frequency energy proportion; performing frequency filtering and waveform analysis on the vibration signal, calculating the impact intensity factor and the vibration energy entropy value; making abnormal judgments on the discharge pulse density and the impact intensity factor, and marking the abnormal discharge according to the abnormal judgment results; based on the synchronous change correlation of the high-frequency energy proportion and the impact intensity factor and the vibration energy entropy value, verifying the abnormal discharge marking result, and obtaining the discharge fault result. The present application can realize efficient detection and accurate diagnosis of switch cabinet discharge faults.

A multi-dimensional hydropower station control panel cabinet working condition abnormity monitoring method based on sound recognition is characterized in that a sound pickup, a mutual inductor, an infrared image monitor, a switch node sensor and the like are installed at different positions of a control panel cabinet to acquire multi-dimensional data including voiceprint, voltage, current, temperature, images and switch displacement signals; the voiceprint signals are subjected to pre-emphasis, framing, FFT transformation, Mel frequency filter bank application, MFCC feature extraction and the like, and feature vectors are extracted by using UBM, GMM and MAP algorithms. A PLDA algorithm is adopted for data analysis and fault judgment, multi-dimensional data comprehensive scoring is fused, the fault type is determined, alarm information and processing measures are output, and the system has the advantages of comprehensive multi-dimensional data acquisition, advanced signal processing technology, scientific and accurate fault judgment, high practicability and the like.

The invention belongs to the technical field of microwave passive devices, and discloses a millimeter wave duplex power divider based on a multilayer metal gap waveguide and a working method thereof, and the millimeter wave duplex power divider comprises a common channel, a low-frequency filtering power divider and a high-frequency filtering power divider; the input port of the common channel is used for being connected with an electromagnetic wave signal source, and the output end of the common channel comprises an upper output channel and a lower output channel. Wherein the first output channel is connected with the input port of the low-frequency filtering power divider, and the second output channel is connected with the input port of the high-frequency filtering power divider; the low-frequency filtering power divider and the high-frequency filtering power divider are stacked up and down and adopt double-layer metal gap waveguide structures; wherein a fourth-order resonant cavity is arranged in the double-layer metal gap waveguide structure so as to realize a duplex power division function; functions of a duplexer and a power divider are integrated, loss caused by machining and assembling errors is greatly reduced, and low insertion loss and high isolation between channels of the duplex power divider are achieved.

The invention provides a time sequence prediction method and system based on frequency filtering and multi-view modeling, and relates to the technical field of time sequence prediction. Comprising the following steps: acquiring historical time sequence data, filtering to obtain a filtered seasonal component, and performing multi-scale division to obtain a multi-scale sequence; in each scale sequence, introducing an embedding amount, performing cyclic translation in a time dimension, generating fragments of multiple view angles, and calculating cyclic attention of the multi-scale sequence; calculating the inter-segment attention of the current scale sequence and the lag differential attention between adjacent segments to obtain the residual attention of the multi-scale sequence; and further obtaining a feature representation corresponding to each scale sequence, and aggregating the feature representations of the multi-scale sequences to obtain a multi-scale comprehensive feature representation. According to the method, effective high-frequency details are reserved while noise is removed, periodic features and local dynamic changes in time sequence fragments are extracted, and the long-term dependency relationship between different time fragments is modeled.

The invention discloses a method for adaptively identifying the thickness of a black soil layer based on a variational mode decomposition method and a ground penetrating radar technology, and the method can directly measure the thickness of the black soil layer of a large-area black land through the ground penetrating radar technology, automatically filters ground penetrating radar signal clutters, and corrects the ground position. According to the technical scheme, on the basis of a center frequency method and a residual error method, variational mode decomposition parameters suitable for black land ground penetrating radar signals are automatically obtained, then modal components of variational mode decomposition are subjected to counting analysis, a spectrogram of original ground penetrating radar signals and the actual black soil layer thickness are compared, an empirical model based on the peak area proportion is established, and the calculation accuracy is improved. The automatic screening can be used for identifying the post-screening center frequency and frequency sweep width of the thickness of the black soil layer, and the position of the black soil layer is adaptively identified after frequency filtering, so that the thickness of the black soil layer can be quickly obtained, and the identification accuracy and efficiency are improved.

The invention discloses a patch clamp electrophysiological data processing method and a patch clamp electrophysiological data processing system. The method comprises the following steps: acquiring ion channel current data through a patch clamp microelectrode; baseline drift removal processing is carried out on the ion channel current data through an adaptive quadratic linear fitting function to obtain baseline correction current data; performing discretization processing and high-frequency filtering processing on the baseline correction current data based on a preset sampling frequency to obtain a filtering current signal sequence; performing calculation through a false nearest neighbor method to obtain an optimal embedding dimension, performing calculation based on an average displacement method to obtain optimal delay time, and performing second phase space reconstruction through the filtering current signal sequence, the optimal embedding dimension and the optimal delay time to obtain an optimal vector set and a phase space reconstruction matrix; calculating through a singular value decomposition algorithm and a Shannon formula to obtain a principal component vector set and an information entropy corresponding to each vector, judging through a preset information entropy threshold to obtain a principal vector sequence, and reconstructing through a singular matrix to obtain electrophysiological feature data.

The invention provides an optical cable intrusion detection method and device based on distributed optical fiber vibration sensing, belongs to the technical field of optical fiber sensing and security monitoring, and solves the problems that existing optical cable security monitoring is high in false alarm rate, poor in real-time performance and difficult to meet long-distance optical cable security requirements. The method comprises the following steps: acquiring a first vibration signal in a preset amplitude range; performing frequency filtering processing on the first vibration signal to obtain a second vibration signal; performing feature extraction processing on the second vibration signal to obtain a high-dimensional feature vector; performing multi-scale time sequence classification processing on the high-dimensional feature vector to obtain classification data; and determining the vibration state of the optical cable according to the classification data. According to the scheme, long-distance security monitoring of the optical cable is realized, and the accuracy of a detection result is improved.

This application provides a system for generating a drive signal and a method for generating a drive signal for driving a two-in-one device integrating a first component capable of generating sound and a second component capable of generating vibration. The system includes an audio signal pre-processing module, configured to perform low-frequency filtering and acoustic effect processing on an input signal according to a high-pass filtering parameter to obtain an audio signal; a vibration signal generation module, configured to generate a vibration signal based on an acoustic characteristic of the audio signal or a preset vibration library; a signal synthesis module, configured to superpose the audio signal with the vibration signal to output the drive signal; and an amplitude-limiting control module, configured to determine whether the audio signal and the vibration signal exceeds a maximum allowable range when superposed, and attenuate the audio signal and / or the vibration signal.

The utility model discloses a double-frequency filter based on an SIW and an HMSIW. The double-frequency filter comprises a dielectric substrate, an upper metal layer, a lower metal layer, a metal through hole array penetrating through the upper metal layer and the lower metal layer, a 50-ohm feed port and a conical conversion feed structure. An SIW structure is arranged on the upper surface of the substrate, H-shaped complementary split-ring resonators which are symmetrically arranged are arranged on a metal layer on the upper surface of the substrate, so that the dual-frequency filter with metamaterial characteristics is realized, and an HMSIW-based miniaturized dual-frequency filter is realized by cutting an SIW equivalent magnetic wall. Compared with the existing metal waveguide, LTCC (Low Temperature Co-Fired Ceramic) process and the like, the processing difficulty is reduced, and the requirements of easy processing, miniaturization and high performance of modern wireless communication are met.

A delay control circuit includes a delay circuit configured to provide a predetermined delay to signals input to a plurality of electrode segments provided in series along one or both of two waveguides forming a Mach-Zehnder interferometer of an optical modulator, a control circuit configured to select two electrode segments from the plurality of electrode segments, and control a delay amount between the two electrode segments that are selected, a frequency filter configured to extract a predetermined frequency component from output light of the Mach-Zehnder interferometer, in a state where identical signals that vary at random are input to the two electrode segments, and a monitor configured to monitor a power of the extracted predetermined frequency component. The control circuit controls the delay amount between the two electrode segments based on a monitored result of the extracted predetermined frequency component.

The invention discloses a GIS ultrahigh frequency sensor ultrasonic cooperative detection system based on piezoelectric energization, and relates to the field of electric power detection, and the system comprises an excitation module which is used for transmitting a piezoelectric excitation signal with a specific frequency to a preset detection region in GIS equipment, so as to trigger the potential partial discharge acoustoelectric signal radiation of the region; the sensing module is used for receiving ultrahigh-frequency electromagnetic signals and ultrasonic vibration signals radiated by partial discharge in the GIS equipment; the excitation frequency, the filtering bandwidth and the sampling rate are dynamically optimized according to the detection result, the detection accuracy and efficiency are continuously improved, and reliable and effective guarantee is provided for safe operation and defect early warning of GIS equipment.

Aspects of the disclosure relate to wireless communication, and high-frequency filters with resonators. One aspect is a device including first and second busbars, and electrode fingers coupled between the busbars, with electrode fingers extending different distances toward an opposite busbar such that a second end of each of the electrode fingers collectively form wave shapes. The device further includes pluralities of gap reflectors positioned between the wave shapes and a nearest busbar.

The invention discloses a broadband wearable double-frequency filtering antenna with an independent and controllable radiation zero point, and the antenna employs a double-layer dielectric substrate structure, the upper layer is a Rogers4350B substrate, the lower layer is a flexible felt substrate, and a multi-structure coupling design of a T-shaped strip, a U-shaped groove, a rectangular groove and a parasitic strip is integrated through a rectangular radiation patch. And dual-frequency work and radiation zero independent regulation and control are realized. Wherein the T-shaped strip generates a dual-frequency characteristic and a first radiation zero point between two frequency bands; the U-shaped groove regulates and controls the low-frequency zero point and broadens the low- The rectangular groove introduces a second radiation zero point between two frequency bands and expands the high-frequency bandwidth; a high-frequency zero point and a new resonance point are introduced into the parasitic strip, and the high-frequency matching bandwidth is widened. The antenna has the flexible wearable characteristic, the broadband performance and the independent controllable characteristic of the radiation zero point, and is suitable for wireless communication scenes such as WiMAX / WLAN and the like.

The invention relates to the technical field of intelligent control, in particular to a specialty paper slitting and embossing process thickness detection system, which comprises an acquisition module used for determining a plurality of dynamic reference points at a preset position at the downstream of an outlet of an embossing roller, acquiring original displacement data in real time, constructing a dynamic polygon according to the dynamic reference points, and determining the thickness of the dynamic polygon; calculating a centroid offset and an area change rate, generating a dynamic adjustment coefficient, and calibrating the displacement original data through the dynamic adjustment coefficient to obtain calibrated displacement data; the filtering module is used for performing high-frequency filtering processing on the calibration displacement data to generate filtering displacement data; and the anti-interference module is used for performing anti-electromagnetic interference processing on the filtering displacement data to generate anti-interference displacement data. According to the invention, through accurate detection, anti-interference processing and real-time control of the whole link, high-precision monitoring and regulation of the thickness of the special paper in the slitting and embossing process are realized.

The invention discloses an AI-based high-fidelity audio coding and decoding algorithm adaptive to an auditory range and a compression optimization method, and the algorithm comprises an audio signal preprocessing module which is used for carrying out the preprocessing of an input audio signal, including but not limited to denoising, frequency filtering, gain adjustment, time domain / frequency domain transformation and the like, and carrying out the compression optimization of the audio signal; and the preprocessing module is used for performing feature extraction through a convolutional neural network (CNN) or an auto-encoder network so as to improve the signal-to-noise ratio of an audio signal and remove environmental noise, and generating optimized audio features. Through an AI-based auditory range adaptation algorithm, dynamic optimization can be performed according to individual auditory characteristics, so that the audio coding and decoding process is more in line with the perception characteristics of human ears, better balance is obtained between the compression ratio and the tone quality, higher audio experience is provided, and through the adaptive quantization and code rate control technology, the audio coding and decoding efficiency is improved. According to the method, on the premise of keeping the high-fidelity tone quality, the deep learning algorithm is utilized to optimize the allocation of computing resources, and the consumption of the computing resources is reduced.

The invention provides an ultra-wideband down-conversion method without preselection filtering, which adopts a secondary frequency conversion scheme, does not need preselection filtering of an input radio frequency signal, after the radio frequency signal is filtered by a low-pass filter, the radio frequency signal is up-converted to an intermediate frequency, and then the radio frequency signal is filtered by an intermediate frequency filter and then down-converted to obtain an intermediate frequency signal. When up-conversion is carried out for the first time, a passive mixer with the third-order cross modulation (LO-2IF) suppression larger than 60 dBc is used, meanwhile, through passive frequency multiplication and segmented filtering of a local oscillator fundamental wave signal, strict control over the harmonic component of a local oscillator signal entering the first mixer is achieved, and therefore the harmonic component of the local oscillator signal entering the second mixer is strictly controlled. An intermediate-frequency signal is filtered through a different intermediate-frequency filter on an intermediate-frequency link, and the frequency conversion assembly achieved through the method still has the false suppression level larger than 45 dBc under the condition that pre-selection filtering is not needed. According to the invention, the complexity, cost, volume and weight of the system can be reduced, and the system has excellent telecommunication performance.

The invention relates to the technical field of radio-frequency channels, in particular to a high-dynamic full-wave receiving radio-frequency channel which is composed of a radio-frequency signal processing circuit, a frequency mixing circuit and an intermediate-frequency signal processing circuit, after radio-frequency filtering is carried out on a changed radio-frequency signal, the radio-frequency signal is changed into a fixed intermediate-frequency signal through frequency mixing, and the fixed intermediate-frequency signal is used for narrow-band intermediate-frequency filtering and amplification. And outputting the signal of which the amplitude and the signal-to-noise ratio meet the requirements to a baseband unit for sampling and processing. The high-dynamic full-wave receiving radio frequency channel provided by the invention has the advantage of effectively improving the working range of the radio frequency receiving frequency, can perform amplification, filtering, frequency mixing, gain control and the like on wireless signals in the frequency range of 10KHz-30MHz, and meets the requirements of wide input dynamic range input signals. According to the radio frequency receiving channel, stable, high-signal-to-noise-ratio and low-distortion intermediate frequency signals are output to a baseband part for sampling all the time, and the problems that a common radio frequency receiving channel at present is single in radio frequency receiving frequency working range and cannot cover the frequency range of 10 KHz to 30 MHz are solved.

A vehicle vibration extraction system according to the present disclosure includes: at least one memory configured to store instructions; and at least one processor configured, by executing the instructions, to acquire measurement data of vibration generated on a road from a sensing apparatus that measures vibration generated on the road by using an optical fiber buried in the road, and extract a vehicle vibration component from the measurement data by performing frequency filtering on the measurement data by using a band limiting filter having a passband associated to the road and a road surface state of the road.

The utility model discloses an anti-loosening high-frequency filter connector device in the technical field of filter connectors, which comprises a filter plug, a filter butt joint device is arranged on the right side of the filter plug, a connector insertion rod is fixedly mounted in the middle of the filter plug, and a butt joint slot is arranged on the inner side of the filter butt joint device. The outer side of the filter plug is provided with a clamping mechanism, the outer side of the filter butt joint device is provided with a plugging mechanism, the anti-loosening high-frequency filter connector device is additionally provided with the clamping mechanism and the plugging mechanism, the clamping mechanism and the plugging mechanism supplement each other and adopt a detachable structure, and the installation operation can be quickly carried out by virtue of the characteristics of the fastening hoop; the filter plug and the filter butt joint device do not need to be molded again, time and labor are saved, the filter cannot be affected, in addition, the clamping mechanism and the insertion mechanism adopt an opposite insertion structure, the filter plug and the filter butt joint device can be stably butted together rapidly, and the rapid butt joint effect is achieved.

The invention discloses an LLCL filter design method, and relates to the technical field of power electronics. The method comprises the following steps: acquiring an initial filter capacitance, an initial inverter side filter inductance, a power grid side filter inductance and a target frequency; calculating filtering branch inductance based on the filtering capacitance and the target frequency; calculating a positive harmonic peak frequency based on the filter capacitor, the inverter side filter inductor, the power grid side filter inductor and the filter branch inductor; calculating damping resistance, damping inductance and damping capacitance based on the positive harmonic peak frequency, the filter capacitance, the resonant frequency value constraint, the first value range constraint and the second value range constraint of the quality factor; and when the target parameter does not meet the grid-connected current harmonic standard, updating the filter capacitor and / or the inverter side filter inductance, and skipping to the step of calculating the filter branch inductance based on the filter capacitor and the target frequency so as to carry out iteration until the grid-connected current harmonic standard is met. According to the embodiment of the invention, the design optimization of the parameter value of the filter element in the LLCL filter is realized.

The invention provides a high-frequency filter for a silicon carbide controller and a design method of the high-frequency filter, the high-frequency filter comprises a large runway type magnetic ring, a small runway type magnetic ring, an X capacitor, a Y capacitor and an integrated filter structure for loading the filter elements, and the miniaturization of the filter is realized. The design method specifically comprises the following steps: calculating the frequency of an interference source and a conducted interference voltage transfer gain upper limit; determining an initial topological structure and an optimization sequence; initializing the element value of each element of the filter circuit; carrying out element value iterative optimization by a genetic algorithm; modifying a contemporary optimal element individual; judging whether the element composition can be optimized or not; changing the sequence or topological structure of filtering elements; and calculating whether each element meets the optimal filter scheme of the constraint condition. The invention aims to solve the problem that the traditional filter design is difficult to effectively deal with high-frequency electromagnetic interference caused by a silicon carbide controller for a new energy vehicle.

The invention discloses a wide-stop-band reflection-free double-frequency filter, particularly relates to the technical field of microwave communication, and solves the problems that in the prior art, a double-frequency-band filter usually has signal reflection outside a working frequency band, and a small number of reflection-free double-frequency-band or multi-frequency-band filters are often complex in structure and low in cost. The technical problems of large size, poor absorption effect and poor high-stop-band effect of a non-reflection dual-band filter in the prior art, and certain out-of-band rejection performance and insertion loss are sacrificed while the non-reflection dual-band filter pursues the non-reflection characteristic, and particularly, harmonic suppression is poor in a transition area of two frequency bands and a high-stop-band area are solved. According to the technical scheme, a quarter-wavelength coupling microstrip line MCL1 and a quarter-wavelength microstrip line ML2 are connected in series, and a three-quarter-wavelength microstrip line ML1 and a three-quarter-wavelength microstrip line ML2 are introduced and connected in parallel to form a dual-frequency band-pass filtering response; according to the invention, a good full-band absorption effect is achieved, and the frequency selectivity of in-band signals is also enhanced.

The invention discloses an intermediate frequency filter chip based on a gallium arsenide IPD process, which adopts the GaAs IPD process with three metal layers and comprises six resonators, twelve capacitors and three metalized grounding holes. The six resonators are composed of capacitors C1-C6 and inductors L1-L6 which are connected in series / in parallel, the inductors are all of self-built octagonal structures, and wiring is only conducted on the middle layer and the uppermost metal layer; a branch series capacitor Ca-Cc and a main parallel capacitor Cd-Cf respectively form six transmission zeros outside a low-frequency band and a high-frequency band. According to the invention, the characteristics of small size and wide band of the filter chip are realized, the loss is reduced, the in-band flatness is improved, and the filter chip has high frequency selectivity and high out-of-band rejection capability.

The invention discloses a software radio digital signal frequency conversion method and system and a medium. Relates to the technical field of digital signal processing. Comprises: acquiring an input signal; performing complex multiplication on the input signal and the carrier signal to obtain a frequency conversion signal; based on an adjustable filtering extraction module, performing integral multiple or rational multiple filtering extraction on the frequency conversion signal to obtain an output signal; wherein rational multiple filtering extraction is realized by a numerical control oscillator and an interpolation unit; according to the scheme, on the basis of the traditional technology of realizing the digital down converter on the FPGA, the method and the structure are improved, and on the basis of an adjustable filtering extraction module, integral multiple or rational multiple filtering extraction is carried out on a frequency conversion signal to obtain an output signal; free adjustment of the digital down-conversion multiple is achieved, and rational number multiple configuration of digital down-conversion is achieved based on the numerically controlled oscillator and the interpolation unit.

A system for beamforming and filtering. In some embodiments, the system includes an array of antenna elements; and a front-end circuit connected to the antenna elements, the front-end circuit including a plurality of delay elements. The delay elements may be configured to provide beam forming; and to operate as delay elements in a finite impulse response filter.

The invention discloses a signal high-frequency interference resisting device and method for electrical resistance tomography. A high-frequency filtering unit in the device comprises a magnetic ring, a coaxial shielding line, a first resistor and a second resistor; the coaxial shielding lines are connected between the corresponding detection electrodes and the signal sampling ends, and the first resistors are connected between the first ends of the signal lines in the corresponding coaxial shielding lines and the first ends of the signal lines in the next coaxial shielding lines. The second resistor is connected between the second end of the signal line in the corresponding coaxial shielding line and the second end of the signal line in the next coaxial shielding line; the first end of the signal line in the coaxial shielding line is also connected with the first end of the shielding layer in the next coaxial shielding line; the magnetic rings sleeve the outer layers of all the coaxial shielding wires and are tightly attached to the outer layers of the coaxial shielding wires, filtering on a transmission line is achieved, the twisted-pair coaxial shielding wire magnetic rings are combined to serve as transmission wire harnesses, a hardware coupling filter circuit between the wire harnesses is constructed, the suppression effect of common-mode interference is improved, sampling signals are more real, and imaging is clearer.

The invention discloses a rotary table angle data filtering method based on an adaptive cut-off frequency filter, relates to the technical field of signal data filtering, and aims to solve the problem of numerical value jumping caused by high-frequency noise interference on rotary table angle data. The method comprises the following steps: firstly, setting a minimum cut-off frequency and a speed coefficient for an adaptive cut-off frequency filter, obtaining rotary table angle data, calculating the change speed of filtered standard data, and dynamically adjusting the cut-off frequency of the filter; filtering the data for multiple times by using an exponential smoothing formula; and finally, updating the dynamic cut-off frequency according to a filtering result to obtain filter parameters. The filter is a low-pass filter, has the advantages of being easy and convenient to adjust parameters, high in adaptability and high in calculation efficiency, can effectively suppress noise, and meanwhile keeps sensitivity to fast change data. Experiments prove that the method has good performance in different speed data processing, and is suitable for an inertial navigation equipment turntable system.

A cascaded energy storage power module and a high-power cascaded energy storage device, the cascaded energy storage power module comprising: an H-bridge converter having a positive output end and a negative output end, the H-bridge converter being used for converting an alternating current into a direct current and outputting the direct current through the positive output end and the negative output end; one end of the first capacitor is connected with the positive output end; the positive electrode of the battery pack is connected with the other end of the first capacitor, and the negative electrode is connected with the negative output end; the first inductor is connected with the first capacitor in parallel; the first capacitor and the first inductor form a parallel resonance circuit which is used for preventing the frequency doubling current from flowing to the battery pack; and the second capacitor is connected between the positive output end and the negative output end. According to the cascaded energy storage power module provided by the utility model, more reliable and low-cost doubled frequency filtering can be realized in the cascaded energy storage power module through the doubled frequency parallel resonance design, and the influence caused by doubled frequency components is solved.

The utility model relates to a split-phase inverter, and the inverter comprises a first filter circuit which comprises a filter capacitor CX1, a filter capacitor CX2, and a filter inductor LX employing a magnetic integrated filter inductor structure; the second filter circuit comprises a filter inductor L; the split-phase inverter circuit comprises a direct current bus DC +, a direct current bus DC-, a first switch network, a second switch network, a direct current filter capacitor C1 and a direct current filter capacitor C2, the direct current filter capacitor C1 and the direct current filter capacitor C2 are connected in series, and the first switch network and the second switch network are electrically connected with the filter inductor LX. The size and the cost of the high-frequency filter inductor are effectively reduced based on the magnetic integrated structure, and the filter performance is improved.