245 results about "Common-mode interference" patented technology

The invention discloses a high-voltage circuit for an electric flame stove. The high-voltage circuit comprises a PFC circuit, a high-frequency conversion circuit, a boosting transformer, an energy coupling circuit and a voltage doubling circuit which are electrically connected in sequence. According to the EMI filter circuit, common-mode interference and differential-mode interference are filtered out, and pure alternating current input is provided for a back-end PFC circuit; two chips are adopted in the PFC circuit, so that the PFC circuit 300 finally realizes the consistency of the current waveform and the voltage phase; in the other embodiment of the invention, double chips are adopted, so that'fault linkage protection 'is realized; stable discharging of multiple groups of positive and negative electrodes is achieved through multiple groups of single energy coupling capacitors and independent voltage doubling rectifier bridges which are connected in parallel.

The invention relates to the technical field of optical fiber sensing, and discloses an optical fiber sensing signal adaptive demodulation analysis method for inhibiting common-mode interference, which comprises the following steps of: synchronously acquiring an original signal of a main sensing optical fiber channel and a common-mode interference signal of a reference optical fiber channel, and performing time-frequency conjoint analysis on the signal of the reference optical fiber channel to obtain a common-mode interference signal; s2, extracting an interference spectrum component containing temperature drift and light source fluctuation characteristics, constructing a hybrid adaptive filter bank which comprises a recursive least square (RLS) filter and a variable step size least mean square (LMS) filter which are connected in parallel, and dynamically adjusting a forgetting factor of the RLS filter and a step size factor of the LMS filter based on the interference spectrum component extracted in the step S2, according to the optical fiber sensing signal adaptive demodulation analysis method for suppressing common-mode interference, a parameter adjustment strategy is continuously optimized, a pure vibration signal with an output signal-to-noise ratio is improved, and the effect of accurately suppressing common-mode interference in real time is achieved.

The present application relates to the field of solution measurement, in particular to an electrode conductivity sensor conductivity measurement circuit and method, first, the AC excitation generation module generates an amplitude and frequency adjustable AC sine excitation signal under the control of the single-chip microcomputer; then the AC sine excitation signal passes through the precision resistor R0 and the conductivity cell of the electrode sensor to the system ground in turn; then the differential amplification circuit differentially amplifies the voltage between the precision resistor R0 and the electrode sheet of the conductivity cell; the amplified voltage signal is collected by the ADC, and then the voltage data is transmitted to the single-chip microcomputer; finally, the single-chip microcomputer can obtain the conductivity of the solution after the collected voltage data is operated. The present application directly collects the peak and valley voltage values of the AC signal, subtracts to obtain the amplitude of the AC signal, and does not need a rectification filter circuit to detect the amplitude of the AC signal, which can quickly respond to the change of the solution conductivity, eliminates the influence of common-mode interference factors, and simplifies the circuit design.

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 relates to a current-to-voltage acquisition circuit for suppressing common-mode interference. The current-to-voltage acquisition circuit comprises a current amplification module, a current transformer, a high-pass filter, an interference acquisition module, an interference analysis module and a suppression execution module, by means of the design, the common-mode interference suppression effect is better than that of a traditional sampling circuit, errors caused by sampling signal deviation generated by interference are avoided to the maximum degree, the common-mode interference suppression circuit is particularly suitable for interference scenes or occasions where interference sources change, the changed interference sources can be calculated in a sampling statistics mode, and the interference source suppression effect is improved. Therefore, the suppression ratio of common-mode suppression is adjusted, and the environment condition is dynamically tracked to obtain an accurate sampling effect.

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 invention discloses an electric leakage detection method based on wavelet transform harmonic suppression, and the method comprises the steps: synchronously collecting a current signal through a dual-channel differential sampling circuit, and obtaining two paths of differential voltages; after common-mode interference is eliminated through differential amplification and impedance matching, low-pass filtering and digital conversion are carried out; extracting signal multi-scale energy characteristics by using wavelet decomposition, and setting a threshold value to separate leakage low-frequency components from high-frequency noise; a pure electric leakage signal is obtained through inverse wavelet reconstruction, and a high-speed switching circuit compares a preset threshold value to trigger a protection action. According to the scheme, differential sampling, impedance matching and wavelet analysis technologies are combined, the signal-to-noise ratio and the detection precision are effectively improved, the problems that in the prior art, electric leakage signals are prone to interference and slow in response speed are solved, and the reliability and the real-time performance of electric leakage protection are remarkably improved.

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 an output current sampling evaluation system for a double-shaft low-voltage motor driver. The output current sampling evaluation system comprises a single-resistance signal acquisition module, a common-mode interference suppression module, a double-shaft current separation module, a current parameter extraction module, a sampling precision evaluation module and an evaluation result integration module. The system collects bus current signals through a single resistor, interference is filtered out through a common-mode interference suppression module based on an equivalent common-mode circuit model, then double-axis current signals are separated out through a double-axis current separation module according to a single-resistor bus current sampling model, after characteristic parameters are extracted, precision data are generated through sampling precision evaluation, and the precision data are analyzed through an analysis module. And finally integrating into a comprehensive evaluation report. According to the system, the problems of insufficient biaxial coupling processing and lack of common-mode interference evaluation systematicness in traditional evaluation are solved, and the accuracy and comprehensiveness of biaxial current sampling evaluation are improved.

The invention discloses a driving power supply fault switching method and system, particularly relates to the technical field of power system relay protection, and is used for solving the problem that an existing relay power supply switching system causes misoperation due to common-mode interference caused by ground fault transient potential gradient. An earth screen potential gradient is collected in real time, a control cable orthogonal electric field component is measured synchronously, an electric field fiber bundle structure is reconstructed based on topology invariant distribution of a cable surface topology sequence substance, and a common-mode interference coupling coefficient is generated according to a space vector relation between an earth screen gradient direction and a reconstructed electric field; the coupling coefficient is converted into electrostrictive strain through the inverse piezoelectric effect, then a dynamic compensation voltage instruction is generated, finally, the compensation instruction is superposed to a power supply control loop to drive a standby power supply to be switched, the coupling influence of earth screen transient interference on a relay is eliminated from the physical mechanism level, the problem of misoperation is fundamentally solved, and the reliability of the relay is improved. And the reliability of power supply switching of the ultrahigh-voltage power transmission and transformation system is

The invention discloses an uninterruptible power protection device replacement system, and relates to the field of power protection devices. The sampling access module is used for connecting a current sampling loop of a temporary protection device to a secondary side of a current transformer in parallel through an isolation transmitter, and connecting a voltage sampling loop to a secondary side of a voltage transformer in parallel through a high-resistance isolation circuit; the parameter monitoring module is used for acquiring a temporary and old protection device homologous current phase difference and monitoring a common-mode interference voltage and an environment temperature change rate; the fusion calculation module is used for calculating a comprehensive protection coefficient; the locking control module is used for remotely locking an old protection device to enter a logic bypass when the comprehensive protection coefficient is stable and meets a preset condition; the safety monitoring module is used for monitoring residual leakage current and protection coefficient change in a logic bypass state; and the removal execution module is used for physically removing the old protection device and the wires when the conditions are met. The protection state is comprehensively evaluated by collecting operation parameters, the old protection device is remotely switched, the operation condition is continuously monitored, and the safety of the replacement process of the protection device is guaranteed.

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 application relates to the technical field of electrolytic cell monitoring, in particular to a lead electrolytic cell voltage online intelligent monitoring method and system, which comprises the following steps: collecting the cell voltage, electrolyte voltage and electrolyte temperature of a lead electrolytic cell at each moment in a monitoring interval; determining the induced common-mode interference condition of the monitoring interval, obtaining the electrolysis high-temperature interference condition of the monitoring interval; combining the induced common-mode interference condition and the electrolysis high-temperature interference condition to obtain a voltage interference factor of the monitoring interval; and respectively correcting the anode voltage drop, cathode voltage drop and electrolyte voltage drop of the lead electrolytic cell to evaluate the lead electrolytic cell voltage monitoring condition. Therefore, the accuracy and reliability of the lead electrolytic cell voltage monitoring are improved.

The invention relates to a totem pole bridgeless power factor correction module and device, a power supply and a power supply system, the power factor correction module is used for performing power factor correction on alternating current input by an alternating current power supply, and the power factor correction module comprises a first transistor, a second transistor, a third transistor, a fourth transistor and an inductor, a first adjusting assembly and a second adjusting assembly are connected to the third transistor and the fourth transistor in parallel respectively, at least one of the first adjusting assembly and the second adjusting assembly is a switch, and the switches in the first adjusting assembly and the second adjusting assembly are conducted before the transistors connected in parallel are switched on when the alternating current power supply crosses zero. According to the embodiment of the invention, the switches in the first adjusting assembly and the second adjusting assembly are configured to be switched on before the transistors connected in parallel when the AC power supply crosses zero, and the connection point of the third transistor and the fourth transistor can be slowly discharged, so that the common-mode switching speed is slowed down, the common-mode interference is reduced, and the leakage current peak is reduced.

The utility model provides a voiceprint sensor circuit of a combined power fan blade, which belongs to the technical field of fan blades and comprises a first differential mode interference elimination module, a second differential mode interference elimination module, a first common mode interference elimination module and a third differential mode interference elimination module, the first differential mode interference elimination module is used for eliminating differential mode static electricity, electrical fast transient pulse train and differential mode surge interference of the direct current power supply, the second differential mode interference elimination module is used for eliminating differential mode static electricity interference, and the first common mode interference elimination module is used for eliminating common mode surge and electrical fast transient pulse train interference. And the third differential mode interference elimination module is used for eliminating differential mode surge and electrical fast transient burst interference. According to the scheme, the protection performance of the voiceprint sensor can be improved.

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 invention discloses a method and a system for predicting crosstalk suppression performance of a shielded cable, and belongs to the field of power electronic electromagnetic interference. The method comprises the following steps: acquiring a common-mode interference source and common-mode source impedance of the inverter power supply, establishing a common-mode electromagnetic interference equivalent circuit of the inverter power supply, and combining a cable bundle equivalent circuit to construct a common-mode crosstalk model of a shielding cable in the inverter power supply system; equivalently replacing the distribution parameters between the cables with common coupling impedance, and updating the common-mode crosstalk model based on the common coupling impedance to obtain a shielding cable crosstalk suppression performance prediction model based on the shielding structure and the electromagnetic parameters; and acquiring the common-mode interference current ip on the current power cable of the equivalent circuit, predicting the common-mode crosstalk current of the shielded cable through the prediction model in combination with a preset shielding structure and electromagnetic parameters, and evaluating the crosstalk suppression performance of the shielded cable. The influence of different parameters of the shielded cable on common-mode crosstalk is quantified, and the crosstalk suppression performance of the shielded cable is accurately predicted.

The invention provides a patient serum miRNA expression level detection method and system, and relates to the field of biomedical detection.The method comprises the steps that on the basis of synchronously collecting multi-channel fluorescence signals, a common time-space change mode of all channels is extracted through statistical analysis, and a time-space change mode of all the channels is obtained; then systematic common mode interference signals are separated by means of adaptive filtering or curved surface fitting and the like, interference is accurately deducted for physical coordinates of each reaction channel, a real reaction process is reconstructed, then amplitude standardization and time axis nonlinear alignment are performed on a reconstruction curve, signal scales and dynamic references are unified, and the real reaction process is reconstructed. And finally extracting characteristic parameters and quantifying the expression level of the target miRNA with high precision in combination with a standard curve model. The problems of reaction kinetics heterogeneity caused by a serum matrix effect and difficulty in stripping systematic noise caused by instrument drifting are solved at the same time, and the accuracy, the reliability and the repeatability of multi-sample parallel detection are greatly improved.

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.

The utility model provides a power module and an electronic system, and the power module comprises a radiator; the insulating substrate is arranged on the radiator; the power chip is arranged on the insulating substrate; and the resistance damping layer is arranged between the radiator and the insulating substrate. According to the power module and the electronic system provided by the utility model, the problem that the effect of suppressing common-mode interference greater than 30MHz on the power module by additionally arranging an EMI filter in the prior art is not ideal is solved.

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 optocouplers, in particular to a common-mode interference resistant optocoupler packaging structure based on condenser integration. The projection of the MYLAR collecting lens on a virtual plane completely covers elements on an IR pin and a PT pin base island, 120-degree divergent light of an IR chip is focused to a light spot with the diameter being 0.15 mm, the energy density reaches 230 mW / mm, 8mA driving current can output 18.2 V, a Faraday cage is formed by means of an aluminum plating layer on the surface of the MYLAR collecting lens, stray capacitance is reduced to 0.5 pF under the distance being 0.3 mm, + / -80 V common-mode pulse interference can be resisted, and the requirement for high-power LED light sources is met. The light-transmitting positioning column is arranged along the optical axis of the MYLAR collecting lens, so that the position of a light spot is more accurate and concentrated in a photosensitive area of the PVG, and stable light energy input is provided for the PVG; the technical problems that an existing ternary LED is insufficient in light intensity, the optical axis temperature electric leakage of a quaternary LED is large, and the small size and the anti-interference requirement repel each other are solved.