166 results about "Common-mode interference" patented technology

The invention discloses an active pen and touch screen interaction system resistant to common-mode interference and a signal demodulation method. The system comprises a signal receiving terminal and a signal transmitting terminal. The signal transmitting terminal modulates data to be transmitted by adopting a differential binary phase shift keying modulation method, and transmits a generated modulation signal to the signal receiving terminal; the analog front-end receiving module is coupled with the signal transmitting terminal, receives the modulation signal and outputs a digital square wave signal after fidelity extraction processing; and the digital demodulation processing module performs differential coherent digital demodulation on the digital square wave signal based on the prior characteristics of the modulation signal, inhibits residual noise and recovers data to be sent. The analog front end focuses strong common-mode noise suppression and analog filtering, the digital demodulation algorithm performs secondary digital purification by using signal time sequence characteristics, and the two constructs an efficient anti-interference pipeline. Meanwhile, the regular square wave signals can be directly processed through differential coherent demodulation, and the requirements for performance and power consumption of a rear-end processor are lowered.

The invention discloses a CAN bus activity detection and wake-up circuit and method, and belongs to the technical field of CAN bus communication, the CAN bus activity detection and wake-up circuit comprises a CAN bus interface circuit, a signal detection and processing circuit and a controller, the input end of the CAN bus interface circuit is connected with a CAN bus; the signal detecting and processing circuit comprises a voltage comparator, the non-inverting input end and the inverting input end of the voltage comparator respectively receive a CANH signal and a CANL signal which are electrically isolated by the CAN bus interface circuit, and the output end of the voltage comparator is connected to a wake-up pin of the controller; the controller is used for monitoring the level state of the wake-up pin, and when the level of the wake-up pin is in an effective state, the electronic equipment is controlled to be switched from the sleep mode to the normal working mode. By introducing an electrical isolation and voltage difference detection mechanism, the problem of false wake-up caused by common-mode interference or bus noise in the prior art is solved, and reliable wake-up under low power consumption is realized.

The application discloses a kind of satellite-borne infrared emissivity differential measurement method and device using cold black background, belong to spacecraft thermal control and material on-orbit testing technical field, purpose is to eliminate environmental stray radiation and conduction heat leakage interference, realize material emissivity high-precision in-situ on-orbit test.The application relies on deep space cold black environment and differential disturbance thought, supporting layout emissivity known standard unit and unit to be measured, make two in consistent light thermal condition, respectively establish transient heat balance equation.Because two kinds of units are consistent, such as common-mode interference of stray radiation, conduction heat leakage, two formula difference can be removed interference term, only keep and emissivity related radiation heat loss term.Through the design of different thermal control conditions (such as balance heating, constant temperature control, dynamic heating), the real emissivity of the material to be measured is solved.The application is suitable for in-situ, high-precision measurement of the infrared emissivity of spacecraft surface materials, especially intelligent thermal control materials such as thermochromic materials in space environment.

The present application belongs to the field of geophysical exploration and geoscience information sensing technology, and relates to an intelligent sensing system for ground construction risk monitoring, comprising: a pulse generation module for generating a detection pulse sequence with a preset time interval; an orthogonal polarization modulation module for mapping the detection pulse sequence with an orthogonal polarization state and loading a time delay modulation; a distributed sensing module for receiving pulse combination and generating a backscattering signal; a common mode interference cancellation module for superimposing the backscattering signal in the photon domain to generate a phase push effect, in-situ canceling a static resident stress background noise, and extracting a dynamic birefringence phase shift amount; and a signal decoupling analysis module for identifying a dynamic shear signal according to a covariance tensor principal eigenvalue extraction value. The present application utilizes an optical domain physical interference cancellation mechanism to annihilate static background interference, realizes high-fidelity physical extraction of weak dynamic signals, and improves the identification ability of the system for structural medium shear instability.

This invention provides a high-voltage pulse ablation system integrating energy transmission and real-time temperature monitoring. It includes a catheter with several electrodes, each equipped with a temperature sensing unit. A temperature monitoring unit corresponds one-to-one with each temperature sensing unit, and their ends are electrically connected via a first wiring harness and a second wiring harness. The high-voltage pulse signal generated by the main unit's pulse module is transmitted to the corresponding electrode via the first or second wiring harness of the temperature monitoring unit corresponding to that electrode, and is also transmitted back to the pulse module via the first or second wiring harness of the corresponding temperature monitoring unit of any other electrode. The temperature monitoring unit synchronously couples and filters out common-mode interference generated by the high-voltage pulse signal using the first and second wiring harnesses, and performs temperature measurement based on the differential signal obtained from the temperature sensing unit via the first and second wiring harnesses. This invention significantly reduces the catheter's outer diameter and enhances its flexibility and vascular permeability.

The application discloses an ACDC isolation converter topology, and relates to the technical field of power electronic converters.The EMI filter module of the topology suppresses the differential mode and common mode interference of alternating current, and after rectification, the APFC boost module actively performs power factor correction on the alternating current, and the voltage of the direct current bus is raised; the switching control module controls the complementary turn-on of the half-bridge switching tube, and sets a dead time; the half-bridge inverter resonance module chops the direct current input of the direct current bus into a square wave signal, the series resonance current is formed by the equivalent inductance of the primary side of the integrated inductive transformer, and electrical isolation is simultaneously completed; the alternating current energy output by the secondary side of the integrated inductive transformer is rectified by the full-bridge synchronous rectification module to obtain direct current output; the switching frequency of the half-bridge switching tube is adjusted by the switching control module, and constant current control is performed.The application can reduce the EMI filter loss, switching loss, rectification loss and feedback cost while ensuring high PF and low THD, and realizes high-efficiency constant current output.

The application relates to the technical field of electric machines, and particularly discloses an electric machine driving and control anti-interference method and system based on an isolator, which can accurately perceive the space-time distribution characteristics of the ground potential difference by constructing a global potential difference dynamic matrix in real time and calculating the common-mode voltage drift amount; based on this, the system no longer maintains the fixed working state of the isolator, but iteratively optimizes the bias current and the gain coefficient of the photoelectric isolator according to the real-time common-mode voltage drift amount, and dynamically reconstructs the transmission parameters; so that the isolator always works in the optimal linear region, effectively avoids signal saturation or cutoff distortion caused by ground potential difference fluctuation, and fundamentally solves the problem that the fixed working point cannot adapt to dynamic common-mode interference.

The invention discloses a voltage sampling method, a source-load all-in-one machine, a device, equipment and a medium, and the method comprises the steps: obtaining initial voltage sampling data and sampling circuit parameters of the source-load all-in-one machine, inputting a sampling resistor precision deviation value and a sampling resistor voltage division ratio of each phase into an interference voltage precision deviation model, obtaining an interference voltage precision coefficient of each phase; calculating according to the initial voltage sampling data and the interference voltage precision coefficient of each phase to obtain the common-mode interference voltage of each phase; calculating a voltage compensation amount corresponding to each phase according to the common-mode interference voltage of each phase; and compensating the initial voltage sampling data according to the voltage compensation amount of each phase to obtain first target voltage sampling data. The voltage sampling precision of the source-load all-in-one machine can be improved.

The invention relates to the technical field of encoders, in particular to a bridge module for an encoder and the encoder, the bridge module comprises a plurality of full-bridge modules connected in parallel, and a substrate comprises a resistance area, a first bonding pad area and a second bonding pad area; the resistance area is provided with a magnetoresistance unit; all the magneto-resistor units are sequentially arranged at intervals in the first direction; in the first direction, the first bonding pad area and the second bonding pad area are located on the two sides of the resistance area respectively. According to the embodiment of the invention, a plurality of full-bridge modules connected in parallel are adopted, common-mode interference such as environmental noise and voltage fluctuation can be counteracted when differential signals are output, and the problem of high noise of the existing Hall technology or AMR technology is solved. Moreover, the substrate is divided into the resistance area, the first bonding pad area and the second bonding pad area, and the magnetic resistance units and the bonding pad areas are independently arranged through partition layout, so that space waste caused by crossed arrangement of elements is avoided, the compact structure is realized, and the problems that an existing magnetic resistance module is disordered in layout and large in size are solved.

The invention discloses a fault diagnosis method for an LED driving power supply of a multi-topology framework. The fault diagnosis method comprises the following steps: acquiring real-time signal data of each topology module; converting the time domain signal data of each topology module into frequency domain information, and extracting power spectral density characteristics of each topology module at different frequency bands; judging whether common-mode interference exists in the topology module or not, and identifying a cross-topology shared interference frequency band; extracting common-mode interference features of different topology modules, and identifying common-mode interference source types; constructing a common-mode interference fault prediction model, and predicting the fault type and risk probability of the multi-topology LED driving power supply caused by common-mode interference; and early warning information is sent to operation and maintenance personnel or an automatic control system through the alarm module, preventive protection measures are executed, a fault source is positioned, and repair operation is performed. According to the invention, through dynamic interference tolerance threshold adjustment and interference identification and prediction among multiple topology modules, the fault diagnosis precision and operation and maintenance efficiency of the LED driving power supply are significantly improved, and system faults caused by common-mode interference are reduced.

The utility model provides an arc discharge detection circuit and a photovoltaic system. The circuit comprises a first sampling circuit, a second sampling circuit, a differential circuit and a processing module, the output end of the first sampling circuit is connected with the positive electrode input end of the differential circuit, the output end of the first sampling circuit is connected with the negative electrode input end of the differential circuit, and the output end of the differential circuit is connected with the processing module. According to the differential circuit, differential mode interference and common mode interference in the electric signals can be eliminated by subtracting the output electric signals of the two photovoltaic pole plates, so that an accurate arc discharge signal is obtained, and whether the first photovoltaic pole plate or the second photovoltaic pole plate has an arc discharge fault is directly determined based on the size of the arc discharge signal; the influence of differential mode interference and common mode interference on arc discharge detection is avoided, and the accuracy of arc discharge detection is improved.

The utility model aims at providing a kind of integrated micro electric signal conductor's cable, realize the integration of multiple signal lines, can effectively suppress common mode interference, fully meet the use requirement under the complex electric field environment of power cable inside, realize safe, reliable and efficient signal transmission, solve the problems of many cable quantity in prior art, large space occupation and easy to be interfered with electromagnetic interference.The utility model includes cable core, the outer layer of cable core is cover layer, the cable core includes several electric power conductor and several signal conductor, the signal conductor is embedded in the gap between the electric power conductor, the outer layer of electric power conductor is crosslinked polyethylene structure, the signal conductor includes N pairs of twisted pair wire, each pair of twisted pair wire includes two twisted enameled wire, the outer layer of signal conductor is wound with polyamide imide film.The utility model is applied to the technical field of power cable.

The invention discloses an anti-electromagnetic interference design method for a wheel-foot humanoid robot in an industrial scene, and particularly relates to the technical field of robots, comprising: S1, constructing a dynamic following electromagnetic shielding structure; s2, establishing a hybrid drive isomeric map filtering system; s3, implementing cross-level electromagnetic compatibility collaborative design; and S4, whole machine cable wiring and grounding system optimization are carried out, layered bundling and directional wiring strategies are adopted, a hybrid grounding model is applied, a low-frequency circuit is in single-point grounding, a high-frequency circuit is in multi-point grounding, and subsystems are connected to a central grounding point through a low-impedance grounding bus. The electromagnetic leakage is avoided, the overall electromagnetic compatibility of the system is enhanced, and the common-mode interference and the ground loop influence are reduced, so that the control precision and the operation stability are ensured.

This invention relates to the field of data transmission technology, and discloses a ring-based communication method, system, device, and medium for isolating control flow in the secondary circuit of a high-voltage switchgear. The method includes: collecting real-time transient ground potential data from multiple grounding points in a high-voltage switchgear substation; recording initial communication parameters and dividing the communication ring network topology for the secondary circuit system within the substation; synchronously performing ground potential common-mode interference analysis and ring network communication quality assessment of the secondary circuit system according to a preset interference detection cycle, and outputting the interference analysis results and communication quality assessment results in real time; comprehensively judging the communication reliability of the secondary circuit system based on the interference analysis results and communication quality assessment results, and executing corresponding communication route reconstruction and isolation protection strategies according to the judgment results. This invention solves the problem of delayed or misjudged response to concealed common-mode interference in existing technologies, providing comprehensive protection for the safe and stable operation of the secondary circuit of a high-voltage switchgear under extreme conditions.

The invention relates to the technical field of communication, in particular to a charger common-mode interference detection method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a preset load jump mode and a load jump condition corresponding to the preset load jump mode; testing the charger to be tested according to the initialization parameter, acquiring a voltage signal output by the charger to be tested, and determining background noise spectrum data according to the voltage signal; carrying out a load jump test on the to-be-tested charger based on a preset load jump mode, and obtaining a response voltage signal of the to-be-tested charger in a preset time window; determining a center frequency parameter according to the response voltage signal, and determining a target common-mode interference signal according to the center frequency parameter; and determining a common-mode interference result of the charger to be tested according to the target common-mode interference signal and the background noise spectrum data based on a load jump condition. The method and the device have the effect of improving the accuracy of charger common-mode interference detection.

The invention discloses a multi-frequency audio space atmospheric density measuring method and device and a spacecraft, the multi-frequency audio space atmospheric density measuring method is applied to the spacecraft, and the spacecraft comprises an audio sending module and an audio receiving module. The multi-frequency audio space atmospheric density measurement method specifically comprises the following steps: sending a plurality of sound waveforms with different frequencies or a plurality of sound frequencies with different waveforms through an audio sending module; receiving a plurality of sound waveforms with different frequencies or a plurality of sound frequencies with different waveforms output by the audio receiving module; and carrying out differential calculation by taking the plurality of sound waveforms with different frequencies or the plurality of sound frequencies with different waveforms as differential signals, filtering out common-mode interference signals, and then obtaining an atmospheric density value through an atmospheric density calculation formula. According to the method, errors caused to the space atmospheric density measurement result when the flight speed of the spacecraft is too high can be eliminated.

The embodiment of the utility model provides a current sampling circuit, a battery management system, a battery device and electric equipment, and the current sampling circuit comprises a diverter which is connected with a detected battery cell group in series; the sampling chip is connected with the diverter in parallel and is used for collecting the voltage at the two ends of the diverter and determining the current flowing through the detected battery cell group based on the collected voltage; the first bidirectional protection assembly is connected in parallel between the diverter and the first sampling pin and is used for performing overvoltage protection on the first sampling pin in positive and negative directions; the second bidirectional protection assembly is connected in parallel between the diverter and the second sampling pin and is used for performing overvoltage protection on the second sampling pin in positive and negative directions; the first filtering assembly is connected between the bidirectional protection assembly and the flow divider in series and used for filtering common-mode noise at the two ends of the flow divider. Therefore, the safety and reliability of the current sampling circuit can be improved, faults caused by transient overvoltage and common-mode interference are reduced, and the precision of current sampling is improved.

The present disclosure relates to a kind of stuck fault detection method, device, equipment, storage medium and program product.The method comprises: during the operation of equipment, the current state information of multiple first electromechanical actuators is collected, and multiple first electromechanical actuators are the same kind electromechanical actuator in the same working condition under the condition of being in the open state;Second electromechanical actuator stuck fault determination result is obtained, wherein the second electromechanical actuator is any one of the first electromechanical actuator, and stuck fault determination result is obtained according to the difference degree of the current state information of second electromechanical actuator and current group information, and current group information is determined by the current state information of multiple first electromechanical actuators.Such, utilize the similarity of the current of the same kind electromechanical actuator in the same working condition to judge, can effectively inhibit common mode interference, improve the accuracy and reliability of stuck fault detection, guarantee the stable operation of equipment.

The application provides a wideband balanced band-pass filter based on a stub-loaded resonator, and solves the problems of strong common-mode interference, narrow passband, low selectivity and large size. The filter comprises two U-shaped microstrip lines, an asymmetric first stepped impedance microstrip line and an asymmetric second stepped impedance microstrip line printed on the upper surface of a dielectric substrate, and a stepped impedance gap line and a rectangular gap line etched on a metal ground plate. A metal through hole penetrates through the whole substrate. The application separates common-mode and differential-mode by using a U-shaped microstrip-to-rectangular gap line structure, realizes good common-mode suppression, introduces a transmission zero point by using a path difference of an L-shaped rotary microstrip stub, and improves selectivity and reduces size. The application has the characteristics of super bandwidth, small size, high selectivity and good common-mode suppression, and is applied to the fields of electromagnetic microwave and radio frequency circuit and system.

The invention relates to the technical field of electronic information, and discloses a reference following anti-interference bidirectional current sampling method and system, and the method comprises the steps: carrying out the driving characteristic enhancement processing of a reference voltage signal, and obtaining an enhanced reference voltage signal; performing common-mode interference suppression processing on the original differential voltage signal to obtain a net differential voltage signal; performing linear amplitude adjustment on the net differential voltage signal to obtain an amplified voltage signal; mapping the amplified voltage signal into a unipolar voltage range by taking the strengthened reference voltage signal as a reference zero point to obtain a unipolar voltage signal; performing correlation coupling on the long-term characteristics and the short-term characteristics to obtain correction parameters, and performing signal reconstruction on the unipolar voltage signals based on the correction parameters to obtain optimized unipolar voltage signals; performing synchronous decoding on the optimized unipolar voltage signal based on the enhanced reference voltage signal to obtain an instantaneous current value and a flowing direction; according to the invention, the precision of bidirectional current sampling can be improved.

The invention discloses a rapid assessment method for radio frequency conducted interference of a power supply module. The method comprises the following steps: carrying out induction and classification on the power supply module from the aspects of function application and size, and then judging the weights of differential mode interference and common mode interference in radio frequency conducted interference of the power supply module through an analytic hierarchy process; influence factors influencing radio frequency conducted interference of the power module are concluded and classified by using an electromagnetic topological structure according to an analytic hierarchy process; carrying out weight analysis on the related influence factors according to an index weight ANP algorithm; performing prediction calculation on conducted interference under each influence factor through a rapid evaluation method; and calculating the radio frequency conducted interference of the power supply module under the condition of multiple influence factors by analyzing the distributed weight. Through the conducted interference under the multi-factor coupling characteristic of the power supply module, the rapid evaluation of the conducted interference of the power supply module is realized.

The application relates to a sensing frame structure and a preparation method thereof, and the sensing frame structure is applied to a current sensor and comprises a magnetic sensitive detection component and a multilayer current transmission structure arranged in layers; part of the multilayer current transmission structure is embedded in a substrate, one end of the multilayer current transmission structure is embedded in the substrate, the other end of the multilayer current transmission structure extends out of the substrate, the multilayer current transmission structure penetrates through the substrate along a first direction, and the upper and lower end faces of the multilayer current transmission structure along the first direction are exposed to the substrate; the magnetic sensitive detection component comprises a first magnetic sensitive detection chip and a second magnetic sensitive detection chip, the first magnetic sensitive detection chip and the second magnetic sensitive detection chip are arranged on the two sides of the multilayer current transmission structure along a second direction respectively, and the first magnetic sensitive detection chip and the second magnetic sensitive detection chip are located on the substrate; by using the technical scheme, the maximum value and the measurement sensitivity of current measurement can be improved, and the anti-interference ability of non-common-mode interference can be improved.

The application discloses a signal processing device and system for processing an induction signal of a magnetic positioning sensor, and the signal processing device comprises: a preamplification circuit, which is used for amplifying the induction signal of the magnetic positioning sensor and suppressing a common-mode interference signal of the induction signal; a filter circuit, which is connected with the preamplification circuit and is used for filtering a signal output by the preamplification circuit at a preset cutoff frequency; a main amplification circuit, which is connected with the filter circuit and is used for amplifying a signal output after being filtered by the filter circuit; and a wave trap filter circuit, which is connected with the main amplification circuit and is used for eliminating noise in a signal output by the main amplification circuit. The application solves the technical problem of inaccurate positioning caused by low precision of the signal processing device.

The utility model provides an intelligent power module. A first substrate, a second substrate, an optocoupler isolation drive circuit module and a power circuit module are arranged in the intelligent power module. The optocoupler isolation driving circuit module is arranged on the first substrate, the power circuit module is arranged on the second substrate, and the first substrate is electrically connected with the power circuit module; wherein; and the optocoupler isolation driving circuit module is used for receiving an external control signal and sending an internal control signal corresponding to the external control signal to the power circuit module. The isolation driving circuit is integrated in the intelligent power module, so that the isolation requirement of electrical safety can be met, the system integration degree is improved, the overall parasitic inductance is reduced, meanwhile, the isolation driving circuit is arranged on the first substrate, the arrangement of leads in the intelligent power module can be reduced, common-mode interference is reduced, and the service life of the intelligent power module is prolonged. The reliability of the intelligent power module is improved, and on the basis, setting of higher voltage and frequency can be achieved.

The invention relates to the technical field of power transmission cables, and discloses an anti-interference earth resistivity measurement cable, which comprises a core wire layer, an inner shielding layer is sleeved outside the core wire layer, an integrated common-mode suppression layer is sleeved outside the inner shielding layer, an outer shielding layer is sleeved outside the integrated common-mode suppression layer, and an inner shielding layer is sleeved outside the outer shielding layer. The outer shielding layer is sleeved with an outer sheath. The core wire layer is composed of a plurality of pairs of differential twisted pairs. The inner shielding layer comprises a first longitudinal wrapping layer formed by an aluminum foil composite belt and a first metal braid layer arranged on the outer side of the first longitudinal wrapping layer. The integrated common-mode suppression layer is composed of a nanocrystalline magnetic ring array distributed in the axial direction of the cable, and nanocrystalline magnetic rings are fixedly arranged in the axial direction of the cable. The integrated common-mode suppression layer is composed of the nanocrystalline magnetic ring arrays distributed in the axial direction of the cable, a high-impedance path can be formed for common-mode interference signals generated by power frequency and harmonic waves of the power frequency, and therefore the signal-to-noise ratio and transmission stability of ground resistivity measurement signals are improved.

The present application relates to a kind of current voltage acquisition circuits of common mode interference inhibition, current amplification module, current transformer, high pass filter, interference acquisition module, interference analysis module and inhibition execution module;By such design, the inhibition effect of common mode interference is more optimal compared to traditional sampling circuit, the error caused by the deviation of sampling signal due to interference is avoided to the greatest extent, especially applicable to the occasion of interference scene or interference source change, the changing interference source can be calculated by sampling statistics, so as to adjust the inhibition ratio of common mode inhibition, accurately sampling effect is obtained by tracking environmental conditions dynamically.

The application provides a magnetic field probe for a pulse magnetic field detector in a radiation environment, and solves the technical problem that a probe based on a magnetic resistance chip mainly applied to extremely low frequency magnetic field and current signal detection test scenes is easily interfered by power lines and signal lines exposed to the external environment in a radiation environment or a complex environment.The magnetic field probe comprises a magnetic resistance chip, a differential circuit, an amplification and filtering circuit, an electro-optical conversion circuit, an IPEX coaxial cable for connecting the circuit, and a coaxial optical fiber for signal output.The magnetic resistance chip senses an environmental magnetic field signal and outputs two opposite signals, the two opposite signals are sent to the differential circuit to eliminate common mode interference, the differential signal is conditioned through the amplification and filtering circuit, the amplified signal is sent to the electro-optical conversion circuit to be modulated into an optical signal, and the optical signal is output through the coaxial optical fiber, so that the measurement of electromagnetic pulses in a complex environment is realized.

The application relates to the technical field of data transmission, and discloses a split-ring communication method, system, equipment and medium for realizing control flow isolation of a secondary loop of a high-voltage switch, which comprises the following steps: collecting real-time ground potential transient data of multiple grounding points of a high-voltage switch substation, recording initial communication parameters of a secondary loop system in the substation, and performing communication ring network topology division processing; synchronously performing ground potential common-mode interference analysis and ring network communication quality evaluation on the secondary loop system according to a preset interference detection period, and outputting interference analysis results and communication quality evaluation results of the system in real time; comprehensively judging the communication reliability of the secondary loop system based on the interference analysis results and the communication quality evaluation results, and executing corresponding communication route reconstruction and isolation protection strategies according to the judgment results. The application solves the problems of response delay or misjudgment of hidden common-mode interference in the prior art, and provides all-round protection for the safe and stable operation of the secondary loop of the high-voltage switch under extreme working conditions.

This invention relates to the field of wireless communication technology, specifically to a broadband balanced antenna feeding method based on a common-mode inductor. This method addresses the shortcomings of traditional balanced antenna feeding technologies, such as insufficient broadband adaptability and poor common-mode interference suppression. It employs a common-mode inductor to convert the single-ended RF signal of the coaxial cable into a differential balanced signal. The method sequentially performs calculations of the single-ended signal input value, measurement of the differential signal amplitude and phase difference, antenna feeding matching degree calculation, detection of coaxial cable outer wall current, and isolation rate calculation. Then, it integrates core parameters to generate feeding parameter calibration coefficients, adjusting the feeding signal output to obtain a stable broadband feeding value. This broadband balanced antenna feeding method based on a common-mode inductor can stably achieve single-ended to differential signal conversion over a wide frequency band, calibrate signal imbalance in real time, effectively suppress outer wall common-mode current interference, improve antenna feeding matching degree, and is suitable for broadband wireless communication, RF detection, and other system applications.

The application discloses a flexible accelerometer based on symmetric split-beam differential optical path, and belongs to the technical field of inertial sensing. The accelerometer comprises a base, a mass pendulum with a symmetric double flexible beam structure, a symmetric split-beam differential optical path sensing unit and a servo control circuit. The optical path sensing unit splits a light source into two symmetric light paths through a split-beam prism, respectively irradiates the reflective surfaces on both sides of the mass pendulum, detects displacement by using differential light intensity change, and realizes high-precision acceleration measurement. The structure can effectively suppress common-mode interference such as light source drift and temperature change, and reduce zero offset drift. The servo control circuit realizes closed-loop feedback, and further improves measurement accuracy and linearity. The application combines optical differential detection and a double flexible beam structure, overcomes the problem of precision reduction caused by factors such as friction and aging in traditional accelerometers, and has the advantages of high precision, low drift, strong anti-interference capability and the like.