25 results about "Resonant filter" patented technology

The invention provides a DC series arc fault detection method for a photovoltaic system. The method comprises the following steps: analyzing the influence of impedance on fault detection; analyzing the influence of switching noise; designing a resonant filter; and designing an arc fault detection algorithm. The resonant filter designed by the invention can effectively amplify an arc fault signal, so that the FFT amplitude change of the fault signal is more obvious, the normal signal and the fault signal are easier to distinguish, and the detection precision of the direct-current series arc fault is improved; and meanwhile, the arc fault and the normal condition can still be distinguished under the condition of large impedance, and the influence of the impedance of the inverter and the converter on the fault detection capability is reduced. The designed fault detection algorithm can effectively work in a system comprising a direct current optimizer and different commercial inverters, can stably realize a fault detection function, is not obviously influenced by system configuration and working condition change, and realizes the universality of the detection method.

The invention discloses a gas spectrum transparent transmission light path system for hydrogen and hydride, which relates to the technical field of spectral analysis and comprises a wide-spectrum light source module, a multi-pass optical path pool, a film lithium niobate modulation module, a two-dimensional material enhanced micro-ring resonant filter, a Fourier transform infrared spectrometer, a data processing terminal and a polarization controller. The wide-spectrum light source module is used for generating wide-spectrum light signals covering hydrogen and hydride characteristic absorption wavebands; according to the invention, the wide-spectrum light source module covers hydrogen and hydride characteristic absorption in different wavebands, simultaneous detection of multiple components is realized in combination with the wide tuning range of the two-dimensional material enhanced micro-ring resonant filter, wavelength modulation is carried out by utilizing the thin-film lithium niobate modulation module, adjacent absorption peaks are accurately distinguished in cooperation with the transmission bandwidth of the micro-ring filter, and the detection accuracy is improved. In addition, the action path is prolonged through the multi-pass optical path pool, and the detection sensitivity of weak absorption signals is enhanced in combination with pressure control and the corrosion-resistant gas chamber.

This invention discloses a surface acoustic wave (SAW) device, comprising: a resonant filter element including multiple parallel resonators, one end of which is connected to at least one ground port; wherein at least two of the parallel resonators are connected to the same ground port, and the ground port connected to the at least two parallel resonators is a common ground port; and a packaging substrate located on one side of the resonant filter element; the packaging substrate includes a first substrate, which includes a common ground region and at least one independent cut-out region; the independent cut-out region is correspondingly disposed to at least one of the common ground ports and connected to the corresponding common ground port; the independent cut-out region is connected to the common ground region through a connecting portion, the extension direction of which is perpendicular to the SAW propagation direction of the SAW device. This invention improves the isolation performance of the device.

The utility model discloses a resonant filter circuit, a device and a frequency conversion device, and relates to the field of circuits, when a frequency conversion system controls a compressor to start, a controllable switch is switched on, an LC filter module is connected to a circuit between an AC power supply and the frequency conversion system, harmonic waves generated in the circuit are filtered, and the frequency conversion system is switched on. The harmonic current content in the air conditioner subsystem is reduced; and when the frequency conversion system does not control the compressor to start, the controllable switch is kept switched off, and the LC filter module is not put into use, so that the consumption of reactive power by the capacitor is avoided. Whether the LC filter module is put into use or not is controlled by switching on and switching off the controllable switch, harmonic suppression is carried out on the working frequency conversion system, meanwhile, voltage loss and electric energy loss caused by the fact that the LC filter module is connected into the circuit when the frequency conversion system does not work are avoided, and reactive power consumption of the whole circuit and the frequency conversion system is reduced.

The application relates to the technical field of electronic circuits, and specifically discloses a resonant filter circuit design method, system and device and a storage medium, wherein a to-be-optimized circuit is modeled as a weighted graph based on a graph representation method weighted by electromagnetic coupling effects, modeling of a complex electromagnetic environment in the circuit is realized, that is, a node represents a resonant unit, an edge represents electromagnetic coupling effects between resonant units, and an edge weight represents differentiated electromagnetic coupling strength; the above graph structure data is input into a fusion graph representation model (EMGNN) of a graph isomorphism network cascade graph attention network to generate a transfer function, a cross-electromagnetic topology graph migration learning mechanism driven by a model and data is introduced to perform migration and electromagnetic parameter reverse optimization on the fusion graph representation model (EMGNN), and deep representation across electromagnetic topologies, electromagnetic parameter iterative optimization and lightweight design across topological structures are realized, so that the method can be applied to isomorphic component circuit design of various different electromagnetic coupling types and different device types.

The application discloses a concave-convex deformation resonance type back-flushing stainless steel filter tank, and belongs to the technical field of stainless steel filter tanks. The filter tank comprises a protective shell, double-cone filter tanks rotatably arranged in the protective shell through collinear rotating shafts A and B, a busbar fixedly arranged on the rotating shaft A, two resonant filter screens with the same structure arranged in the double-cone filter tank, a vibration exciting assembly for exciting the resonant filter screen, vibration springs with two ends connected to the center points of the two resonant filter screens, a filter screen deformation driving assembly for driving the resonant filter screen to deform concave-convexly, a vibration power device for driving the vibration exciting assembly to work, and a turnover motor for driving the rotating shaft B to rotate in the positive direction and the reverse direction. The stainless steel filter tank has a reasonable structure, can significantly improve the flushing efficiency and the flushing quality, and effectively prevents impurities from blocking filter screen holes.

The utility model discloses coagulation hemostasis electric coagulation equipment, and relates to the field of circuits. The equipment comprises a host and electrocoagulation tweezers connected with the host, wherein the host comprises a voltage source module, a driving module, a high-frequency inverter circuit and a resonance filtering module; the input end of the high-frequency inverter circuit is connected with the voltage source module, the driving end of the high-frequency inverter circuit is connected with the driving module, the voltage source module is used for outputting a target direct-current voltage, and the driving module is used for outputting a driving signal; the output end of the high-frequency inverter circuit is connected with the input end of the resonant filtering module, and the output end of the resonant filtering module is connected with two electrodes of the electrocoagulation tweezers; the high-frequency inverter circuit is a push-pull inverter circuit, the high-frequency inverter circuit is used for converting the target direct-current voltage into initial alternating-current voltage, and the resonant filtering module is used for filtering the initial alternating-current voltage and outputting the target alternating-current voltage to the electrocoagulation tweezers. The energy loss of AC-DC conversion can be reduced, and the working time and efficiency of the hemostatic electric coagulation equipment can be improved.

The invention relates to a high-voltage cascade battery energy storage system module direct current side filter and a parameter determination method thereof, and belongs to the technical field of filter design. The parameter determination process of the filter is divided into parameter determination of a resonant filter circuit and parameter determination of a switching frequency filter circuit, wherein the parameters of the resonant filter circuit are determined according to the resonant frequency to be filtered and the amplitude of the impedance of the resonant filter circuit at a set resonant frequency point; the parameters of the switching frequency filter circuit are determined according to the amplitude and damping ratio of the amplitude-frequency function corresponding to the switching frequency filter circuit at the switching frequency, the parameter determination processes of the two circuits are mutually independent and do not interfere with each other, the engineering parameter design process is simplified, and the design efficiency is improved. And the design of the parameters of the direct-current side filter of the high-voltage cascade battery energy storage system module can be quickly and accurately realized.

Embodiments of the present invention disclose a resonant filter and a manufacturing method thereof. The manufacturing method includes: sequentially laminating and manufacturing a first electrode structure, a piezoelectric structure, and a second electrode structure. A first notch is formed in the second electrode structure. A first support block and a second support block are manufactured on the second electrode structure. The first support block is located on the second electrode, and the second support block is located between two adjacent second electrodes. A resist structure is manufactured on the side of the support block facing away from the piezoelectric structure. The material of the piezoelectric structure is different from that of the resist structure, and the material of the first electrode structure is different from that of the resist structure. The resist structure is a non-metallic material. A second notch is formed in the first electrode structure. A groove penetrating through itself is manufactured in the piezoelectric structure. The groove is located between two adjacent first electrodes. In the lamination direction of the resonant filter, the projection of the groove is located within the interval projection of two adjacent second support blocks, and the resist structure at this interval is exposed in the groove.

The present invention provides a conversion system, comprising a conversion circuit and a filtering circuit. The filtering circuit includes a first inductor, a second inductor, a first notch filter, and a resonant filtering branch. A first end of the first inductor is coupled to a first end of the filtering circuit. The second inductor is coupled between a second end of the first inductor and a second end of the filtering circuit. A first end of the first notch filter is coupled to the second end of the first inductor and a first end of the second inductor. A second end of the first notch filter is coupled to the second end of the second inductor and the second end of the filtering circuit via an internal X capacitor. The first notch filter includes a third inductor and a capacitor connected in series. A first end of the resonant filtering branch is coupled between the second end of the first inductor and the second end of the filtering circuit. The resonant filtering branch includes a capacitor component and a fourth inductor connected in series.

An optical marking label includes one or more elementary cells. The elementary cells include first elementary cells which each are formed by at least one Fano resonance filter formed by a periodic structure made of a phase-change material. The elementary cells may include second elementary cells which are devoid of Fano resonance filters.

The present disclosure provides a harmonic suppression device, method, control unit, power supply device, electrical equipment and storage medium, which relate to the field of motor technology. The device includes: a tuning circuit module connected to the first live wire and the second live wire of the three-phase power supply to perform resonance adjustment processing; a PI-type resonant filter circuit module connected to the tuning circuit module and the third live wire of the three-phase power supply respectively, for performing harmonic filtering processing on the first phase current and the second phase current, as well as the third phase current processed by the tuning circuit module; a rectifier circuit module connected to the PI-type resonant filter circuit module for performing rectification processing and supplying power to the load. The present disclosure can adjust the input voltage, current phase, matching impedance and multiple resonance points in real time to achieve power factor correction of the three-phase power supply, so that the THD of the harmonics of each phase current meets the requirements and the standby power consumption meets the standards; the control is simple, the cost is low and the reliability is high.

This invention discloses a high-precision, wide-tunable hybrid integrated external cavity semiconductor laser and its tuning method, comprising a semiconductor optical amplifier (1), a SiO2 extension chip (2), and a computer (3). A silicon-based ring resonant filter (02) is integrated on the SiO2 extension chip (2). The silicon-based ring resonant filter (02) includes a first micro-ring resonator (001) and a second micro-ring resonator (002), which are connected in series. The refractive index of the waveguide is adjusted using the waveguide thermo-optic effect to achieve "coarse" wavelength tuning and obtain a wide wavelength tuning range. A phase shifter (04) is integrated on the SiO2 extension chip (2), which is used for fine tuning of the cavity length to achieve "fine" wavelength tuning. This invention integrates a miniature spectrometer on the SiO2 extension chip to provide feedback wavelength information and achieve high wavelength tuning accuracy.

The invention discloses a harmonic suppression method and system for a power grid, and relates to the technical field of harmonic suppression, and the method comprises the steps: obtaining a plurality of pieces of training harmonic current data, carrying out the preprocessing of each piece of training harmonic current data, generating a harmonic feature set, and carrying out the weighting of a loss function based on a preset amplitude. And training a preset initial harmonic current prediction model according to the harmonic feature set to obtain a corresponding target harmonic current prediction model, obtaining harmonic current data of the power grid, performing harmonic distribution prediction on the harmonic current data by using the target harmonic current prediction model to obtain corresponding harmonic prediction current amplitude data, and performing harmonic prediction on the harmonic prediction current amplitude data. And performing optimization solution on a preset objective function by adopting the harmonic prediction current amplitude data to obtain corresponding treatment parameters, and adjusting the multi-branch parallel resonant filtering device of the power grid by adopting the treatment parameters. The technical problems that a traditional power grid harmonic suppression method is difficult to adapt to dynamic change requirements of power grid working conditions and the reliability of power grid operation is reduced are solved.

A display device includes light emitting elements disposed in pixels; a color conversion layer disposed on the light emitting elements; a color filter layer disposed on the color conversion layer; and a resonant filter disposed between the color conversion layer and the color filter layer. The resonant filter includes a first semi-transmissive layer, a second semi-transmissive layer, and a medium disposed between the first semi-transmissive layer and the second semi-transmissive layer.

The embodiment of the present application provides a kind of generation method, equipment and radio frequency transmitter of radio frequency signal, wherein the method comprises: the initial signal is mixed with first local oscillator signal and second local oscillator signal respectively, to obtain first output signal;The first output signal is resonant filtered using target filter parameter, to obtain second output signal, wherein the target filter parameter is set to be used to suppress third harmonic generated in signal transmission process, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components for generating third-order intermodulation signal and image signal.By the present application, the problem that the efficiency of suppressing interference signals in the output signal is low is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

This invention discloses an ultra-narrowband optical filter and its design method, belonging to the field of micro-nano optical device technology. It is a reflective all-dielectric guided-mode resonant filter, comprising, from bottom to top, a substrate, a planar waveguide layer, a single-layer one-dimensional subwavelength grating layer, and a single-layer anti-reflection film. The design method includes initial tuning of the resonant wavelength, optimization of the ultra-narrowband bandwidth, fine-tuning of the resonant wavelength, and synergistic optimization of sideband suppression. It clarifies the priority of adjusting each structural parameter, achieving narrowband reflection filtering through the guided-mode resonance effect of the grating and waveguide layer. Through the synergistic design of the single-layer anti-reflection film and the resonant structure, non-resonant broadband background reflection is suppressed without disrupting the ultra-narrowband resonant peak. At the target filtering wavelength of 1064nm, an ultra-narrowband filter with a peak reflectivity of 100% and a full width at half maximum (FWHM) as low as 0.03nm can be achieved, with a sideband suppression ratio exceeding 30dB. This solves the core defect of existing technologies that cannot simultaneously achieve ultra-narrowband filtering and high sideband suppression ratio.

The utility model provides a power amplification circuit and radio frequency steam ablation equipment, relates to the technical field of medical equipment, is used for solving the technical problems that in the prior art, a power amplification circuit in the radio frequency steam ablation equipment is large in switching loss, complex in control and difficult in synchronization, and comprises a zero-voltage switch module and a resonance filtering module, the zero-voltage switch module controls a signal to drive the controllable switch to be switched on and switched off periodically, and the input direct current is converted into pulse current; a resonant element in the zero-voltage switch module is used for enabling the voltage at the two ends of the zero-voltage switch to approach to zero when the zero-voltage switch is switched on or switched off; and the resonant filtering module converts the pulse current into a sinusoidal current with a target frequency, and transmits the sinusoidal current to the radio frequency steam ablation catheter, so that the power amplification circuit can realize zero-voltage turn-on or turn-off, the switching loss in the power amplification circuit is reduced, the zero-voltage switch module only needs to be provided with a controllable switch, and the control is relatively simple.

The invention discloses a surface acoustic wave device, and the device comprises a resonant filtering body which comprises a plurality of parallel resonators, and one end of each of the plurality of parallel resonators is connected to at least one grounding port; wherein one ends of at least two parallel resonators in the plurality of parallel resonators are connected to the same grounding port, and the grounding port connected with the at least two parallel resonators is a common grounding port; the packaging substrate is positioned on one side of the resonant filtering body; the packaging substrate comprises a first substrate, and the first substrate comprises a common grounding area and at least one independent cut area; the independent cutting regions are arranged corresponding to at least one of the public grounding ports, and the independent cutting regions are connected with the corresponding public grounding ports; the independent cut regions are connected with the common grounding region through connecting parts, and the extension direction of the connecting parts is perpendicular to the surface acoustic wave propagation direction of the surface acoustic wave device. The isolation performance of the device is improved.

The application discloses an extremely low frequency driven MMC topology circuit and a control method thereof, comprising three resonant filter modules, two ends of the resonant filter modules are electrically connected with upper bridge arm circuits and lower bridge arm circuits respectively, the upper bridge arm circuits and the lower bridge arm circuits each comprise N-1 high-capacitance voltage submodules and one low-capacitance voltage submodule; the N-1 high-capacitance voltage submodules are connected in series in turn, and the low-capacitance voltage submodule is connected in series at the end. The application utilizes the resonant circuit to suppress the double frequency component of the submodule capacitance voltage, thereby suppressing the submodule capacitance voltage fluctuation; based on the output waveform performance improvement problem under the extremely low frequency driving condition, the application can suppress the harmonic content by increasing the output level number, and simultaneously realizes the effective tracking of the output current and the submodule capacitance voltage balance by combining the multivariable closed loop control.

This invention provides a voltage setting method, apparatus, device, and readable storage medium. The method includes: starting from a first preset voltage value, gradually increasing the voltage value of an adjusting element according to a preset step size until the voltage value of the adjusting element reaches a second preset voltage value; recording a first monitoring value corresponding to the optical signal intensity at the input of a micro-ring modulator and a second monitoring value corresponding to the optical signal intensity at the output of the micro-ring modulator at each voltage value, wherein the second monitoring value changes with the voltage value of the adjusting element; determining whether there is distortion in the resonant filter spectrum of the micro-ring modulator based on the recorded information; selecting a target second monitoring value from the recorded second monitoring values ​​according to a selection strategy corresponding to the determination result; and setting the voltage value of the adjusting element to the voltage value corresponding to the target second monitoring value. Through this invention, the wavelength of the incident optical signal is positioned at a specific location in the filter spectrum of the micro-ring modulator.

The invention discloses a low-profile omnidirectional dielectric resonant filtering antenna, which comprises a patch assembly, a dielectric resonator and a metal floor, and is characterized in that the patch assembly comprises an annular patch and a circular patch, and a gap exists between the circular patch and the annular patch. A mounting hole is formed in the center of the bottom surface of the dielectric resonator, a metal disc is arranged in the mounting hole, and a probe is arranged at the geometric center of the metal disc. And a plurality of short circuit columns are respectively arranged in the dielectric resonators. The patch assembly forms a top loading structure on the upper surface of the dielectric resonator so as to reduce the profile of the antenna. A mixed feed structure is formed through a connection mode of the probe and the metal disc, so that a radiation zero point is generated at the upper edge of an antenna passband, the roll-off rate of the upper edge of the passband is improved, and the suppression level of a stop band is enhanced. The antenna and the filter do not need to be cascaded after being designed, the size of the antenna is reduced, and the antenna has the advantages of being low in profile, small in size, wide in band, low in energy consumption, good in frequency selectivity and the like.

The utility model relates to the technical field of microwave filters, and provides a wide-frequency-band frequency hopping filter and a radio frequency system, and the wide-frequency-band frequency hopping filter comprises a resonant filtering module which is used for filtering signals; the radio frequency switch group module is respectively connected with the resonant filtering module and the capacitance matrix module, the capacitance matrix module comprises at least two adjusting capacitors, and the radio frequency switch group module comprises at least two radio frequency switches; and the digital processing module is connected with the controlled end of the radio frequency switch group module. Based on the structures of the radio frequency switch group module and the capacitor matrix module, the number of adjusting capacitors connected with the resonant filtering module is adjusted through low-voltage control, the equivalent capacitance value is flexibly adjusted, the number and the capacitance value of the adjusting capacitors are set according to requirements, the change range limitation of the equivalent capacitance does not exist, and frequency hopping filtering in a wide frequency band range is realized. A plurality of adjusting capacitors in the capacitor matrix module can equally divide the power load, thereby facilitating the improvement of the power capacity and adapting to a high-power scene.

The present invention relates to the field of wireless charging technology, and particularly to an active rectification synchronization signal generation circuit, a receiver, and a wireless charging system. The active rectification synchronization signal generation circuit in the receiver of the wireless charging system generates a phase synchronization signal required for the active rectification circuit based on the output current of the resonant circuit, and includes: a high-frequency current sensor circuit that measures the output current of the resonant circuit and converts it into a corresponding voltage signal; a resonant filtering circuit that filters the voltage signal to obtain a processing result; and a high-frequency zero-crossing comparator circuit that generates a phase synchronization signal through the processing result. By means of the present invention, an accurate phase synchronization signal can be provided for the active rectification circuit of the wireless charging receiver, so as to achieve synchronous rectification and phase-shift control. During the implementation process, the oscillation problem of the active rectification circuit of the wireless charging system receiver can be significantly improved, and the phase-shift range and load range of the active rectification circuit can be effectively increased.

The present invention discloses a grid voltage observation method based on dual quasi-resonant filters. The method comprises a sliding mode observer, a series-connected dual quasi-resonant filter, and an adaptive compensation link. The sliding mode observer is used to perform preliminary grid voltage observation, the first quasi-resonant filter is used to suppress grid voltage sliding mode noise and DC offset, and the second quasi-resonant filter and the adaptive compensation link are used to achieve grid voltage observation that is resistant to grid frequency offset. After adaptive compensation, the observed grid voltage is ultimately obtained. The present invention uses a quasi-resonant filter instead of a dual low-pass filter to overcome the effects of sampled DC offset on grid voltage observation. Furthermore, the present invention uses two identical quasi-resonant filters in series to suppress sliding mode noise and compensate for grid voltage phase and amplitude, thereby achieving accurate grid voltage observation without requiring a known grid angular frequency, thus overcoming the effects of grid frequency offset.