121 results about "Digital potentiometer" patented technology

The invention relates to the technical field of voltage acquisition, in particular to a battery string voltage acquisition system with a calibration system and a voltage acquisition method. Which comprises a multi-path voltage input end, a voltage signal adjusting end, a voltage follower, an analog-to-digital converter, a main control center and a communication circuit, and is characterized in that the voltage signal adjusting end comprises a dynamic voltage division network, consists of a digital potentiometer and a high-voltage operational amplifier, and dynamically adjusts the voltage division ratio to suppress common-mode voltage; the main control center is integrated with a multi-channel synchronous sampling calibration module and generates a global synchronous signal through the main MCU to control the ADC to perform synchronous acquisition; a temperature compensation module is arranged between the voltage follower and the ADC, and a digital temperature sensor is adopted to correct the gain drift of the operational amplifier in real time; the voltage division ratio of the dynamic voltage division network is dynamically adjusted according to the real-time common-mode voltage and a preset safety threshold value. According to the scheme, dynamic partial pressure adjustment, multi-channel self-calibration, nonlinear temperature compensation and a rapid protection mechanism can be integrated.

The invention relates to the technical field of sensors, in particular to a rigid-flexible coupling rotating body deformation sensor based on full-flexible design and a testing method. The sensor comprises an annular main body; the annular main body is a closed ring formed by alternately connecting a plurality of rigid arcs and a plurality of flexible arcs; the rigid arc and the flexible arc are arranged in a manner of meeting dynamic balance; the plurality of micro data acquisition devices are respectively integrated on each rigid arc; the miniature data acquisition device comprises a Wheatstone bridge, a filtering module, a digital potentiometer, an analog-to-digital conversion module, a digital acquisition module, a single-chip microcomputer, a wireless signal sending module and a battery unit. The plurality of strain gauge groups are respectively arranged on the outer surface of each flexible arc; and the thickness of the flexible arc is uniform. According to the invention, deformation adaptation and high-sensitivity measurement are realized through a rigid-flexible arc alternating structure, and convenient monitoring under a rotation working condition is realized through a wireless communication miniature data acquisition device.

The invention discloses an automatic temperature compensation circuit and method based on a thermal flowmeter, and relates to the technical field of temperature compensation, and the compensation circuit comprises a constant current source module used for driving the thermal flowmeter; the Wheatstone virtual bridge arm is used for acquiring a changed digital-to-analog converter output voltage value output by the controller, and performing voltage conversion on a first voltage and a second voltage which are output on the thermal flowmeter due to the change of the external temperature according to the output voltage value to obtain a third voltage; the digital-to-analog converter is used for performing correction compensation on the third voltage according to the correction compensation value calculated by the controller; and the differential amplification module adopts a differential amplifier to amplify the third voltage and the fourth voltage output by the thermal flowmeter, and outputs a compensated flow signal. The compensating circuit is simple in structure and higher in reliability and precision, and compared with a digital potentiometer, the output value of the Wheatstone virtual bridge arm is changed by using the output value of the digital-to-analog converter, so that the adjusting resolution is higher.

The invention belongs to the technical field of integrated circuits, and particularly discloses a numerical control programmable gain amplifier chip, which adopts an SIP (Session Initiation Protocol) packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, and is characterized in that an alternating current signal is input from the Vin end and is connected to an inverted input end of the operational amplifier through a capacitor C1 and an input resistor R1; a positive power supply pin of the operational amplifier is connected with a power supply positive electrode VDD, a negative power supply pin is grounded, and a VDD / 2 direct current bias voltage is obtained by an in-phase input end through a precision resistance voltage dividing network and is accessed after low-pass filtering; the high end of the digital potentiometer is connected with the Vout end, the low end is connected with the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The digital potentiometer and the operational amplifier are integrated, high integration and modularization of the programmable gain amplification circuit are achieved, and the problems that in a traditional discrete scheme, due to analog switch conduction resistance, gain precision is insufficient, reliability of a multi-element system is lowered, and the circuit size is large are solved.

The invention provides a power supply regulating device and a voltage-adjustable power supply circuit thereof, and relates to the technical field of power supply regulation, the circuit is additionally provided with a sampling resistor, an operational amplifier unit and an MCU on the basis of keeping the original sampling partial voltage, and adjustable analog level output by the MCU is injected into a DC-DC feedback pin after being subjected to operational amplifier gain, so that the voltage-adjustable power supply circuit is formed. The potential of a feedback node is biased in a voltage superposition mode, so that the output voltage and the analog level are in an approximately linear relation; according to the invention, higher resolution adjustment can be obtained in a preset full range only by changing the DAC level or the PWM duty ratio, the gear intervals are uniform, digital potentiometers or segmented switching are not needed, the calculation is simple, the hardware cost is low, and the control is convenient. The high-precision power supply can be widely applied to occasions requiring a software controllable high-precision power supply, such as a thermal printing head test fixture, ink-jet head ink quantity control, motor torque adjustment and the like. The invention aims to solve the problems that the resolution of a low-voltage section is suddenly reduced and the fineness is insufficient due to resistance-voltage nonlinearity during wide-range voltage regulation of a traditional digital potentiometer type DC-DC feedback network.

The invention provides a wide dynamic range methane detection system based on synchronous accumulation and system reconstruction. The device is characterized by comprising a modulated laser (1), a gas absorption cell (2), a photoelectric detector (APD) (3), a variable gain trans-impedance amplifier (TIA) (4) based on a digital potentiometer, a dual-threshold voltage comparator circuit (5) and a microcontroller processing unit (6). The device can be used for large-dynamic-range real-time monitoring of the methane gas concentration, and the problem that a traditional TDLAS system is prone to saturation or limited in detection limit when the concentration span is large is effectively solved. The method can be widely applied to the fields of gas concentration detection, industrial safety control and the like.

The utility model belongs to the technical field of analog resistors, and particularly relates to a closed-loop feedback type analog resistor output circuit which comprises a micro-control unit. A sampling resistor; the programmable differential gain amplifier is connected with the sampling resistor and the micro-control unit; the digital-to-analog converter is respectively connected with the programmable differential gain amplifier and the micro-control unit; and the digital potentiometer is connected with the digital-to-analog converter. The micro-control unit monitors and controls each part, continuously digitally adjusts the gain of the programmable differential gain amplifier, the D value of the digital-to-analog converter, the digital voltage division ratio of the digital potentiometer and other parameters, and continuously optimizes the whole analog resistance output process according to feedback signals. Therefore, the highest precision of the analog resistor is ensured to reach 0.01%.

A Peripheral Nerve Stimulation (PNS) system and method are disclosed. The system includes a headset with ear hooks and electrodes for placement on the mastoid processes. A stimulation device connected to the headset via lead wires delivers a pulsed electrical current to the electrodes. The device communicates with a computing device equipped with a mobile application that controls the stimulation characteristics. The mobile application allows users to adjust settings, monitor progress, and access treatment sessions. The system also includes snap ports for electrode attachment, self-adhesive hydrogel electrodes, and current control mechanisms using a digital potentiometer and waveform generator. The method includes pre- and post-session anxiety rating, personalized treatment based on user inputs, and tracking of physiological biomarkers. The application supports multiple operating systems, secure cloud data storage, and enables data sharing with healthcare providers. The invention provides a comprehensive, customizable, safe solution for managing anxiety and insomnia.

This invention relates to a drive control circuit, its control method, medium, and switching circuit. The control method includes: controlling a power switch to start in an adaptive starting current identification mode; monitoring the starting current of the power switch; determining whether the starting current is within a preset range; and if not, adjusting the resistance of a digital potentiometer to bring the starting current within the preset range. This invention enables the automatic adjustment of the conduction speed of the power devices in the switching circuit based on the state of the downstream power circuit, thereby controlling the circuit's starting current and ensuring safe circuit startup.

The invention provides an over-acceleration protection system of an electric motorcycle. A Hall rotating handle outputs an operation control signal to a vehicle-mounted controller and a first input end of a comparison control circuit; the output end of the speed sensor is connected to the second input end of the comparison control circuit; the power input ends of the first electronic switch and the second electronic switch are connected to the power output end of the motor driving circuit, the power input end of the first electronic switch is connected to the power end of the driving motor, and the power output end of the second electronic switch is connected to the input end of the digital potentiometer. The output end of the digital potentiometer is connected to the power supply end of the driving motor, and the control end of the digital potentiometer is connected to the vehicle-mounted controller; the control input end of the first control circuit is connected to the first control output end of the comparison control circuit, and the first control circuit is used for controlling the on-off of the first electronic switch; the control input end of the second control circuit is connected to the second control output end of the comparison control circuit, the control output end of the second control circuit is used for controlling the on-off of the second electronic switch, and the second control circuit is also used for controlling the on-off of the first electronic switch when the second electronic switch is conducted.

The application relates to a self-enclosed self-adaptive amplitude equalizer. The equalizer comprises an equalization circuit, a tuning branch one and a tuning branch two adopting an electric tuning topological structure, the resistance values of the tuning branch one and the tuning branch two are adjusted to realize continuous slope adjustment of-10 dB to +10 dB in a 300 MHz to 1200 MHz frequency band; a main transmission circuit, an input end RFin and an output end RFout of which are respectively used as an input end and an output end of the equalizer; and the outputs of the tuning branch one and the tuning branch two are connected to a fusion node A on the main transmission circuit; a data acquisition and operation circuit, temperature and amplitude-frequency response data are collected in real time through an MCU microcontroller, and a pre-stored temperature-frequency-compensation lookup table and an aging model are combined to calculate a compensation control signal. The equalization circuit slope is adjusted through SPI control of a digital potentiometer and a varactor, and closed-loop self-correction is realized without manual intervention.

The utility model discloses an intelligent vibration switch circuit, which belongs to the technical field of switch circuits and is characterized in that electronic components adopt a filtering mode and a low-pass and high-pass mode to meet the gain in a wide frequency band range; according to the utility model, the digital potentiometer is adopted to control the gain, so that automatic switching of control channels is realized; a second digital potentiometer is adopted to automatically adjust the change of the phase to obtain the optimal phase; according to the utility model, by reducing the variety of the electronic module, the applicability of the electronic module is improved, and the intelligence of the electronic module is improved; the application applicability of the whole machine is improved; through self-diagnosis, the reliability of the instrument can be conveniently judged, the service life is prolonged, and the production efficiency of products and the rapidness and convenience of automatic maintenance in application are improved.

This utility model provides a high-performance power board, including a power input, a filter circuit, a surge protection circuit, a power conversion module, and a power output module. The power conversion module includes a full-bridge switching circuit and a transformer. The power conversion module has multiple independent outputs. A digital potentiometer is connected to the voltage regulation module of each independent output of the power conversion module, and the value of each independent output of the power conversion module is adjusted based on circuit feedback. This utility model device has the advantages of small size, high stability, and multi-channel adjustable output.

The application belongs to the technical field of integrated circuits, and specifically discloses a digital control programmable gain amplifier chip, which adopts an SIP packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, an alternating current signal is input from the Vin end, is connected to the inverting input end of the operational amplifier through a capacitor C1 and an input resistor R1, a positive power supply pin of the operational amplifier is connected to a positive electrode VDD of a power supply, a negative power supply pin is connected to the ground, a same-phase input end obtains a VDD / 2 direct current bias voltage through a precision resistor voltage dividing network and is connected after low-pass filtering, a high end of the digital potentiometer is connected to the Vout end, a low end is connected to the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The operational amplifier and the digital potentiometer are integrated, high integration and modularization of the programmable gain amplification circuit are realized, and the problems of insufficient gain precision, decreased reliability of a multi-element system and large circuit volume caused by the on-resistance of an analog switch in a traditional discrete scheme are solved.

The invention discloses a smog methane composite detection method and device, relates to the technical field of smog methane detection, and solves the technical problems of weak anti-interference capability in a data processing link and lack of a multi-parameter compensation and calibration system. The effective acquisition range is dynamically calculated in combination with a factory calibration interval, the signal amplification factor is adaptively adjusted by using a digital potentiometer, the electric signal strength is ensured to be stabilized in the optimal interval, the influence of laser loss and environment temperature on basic data is eliminated from the source, and the filtering coefficient is dynamically adjusted in combination with the signal-to-noise ratio by using a layered filtering strategy. Random noise is filtered out, and key features of an absorption peak are reserved; through segmented weighted polynomial fitting, accurate extraction of core parameters of the absorption peak is realized; and a unified multi-round outlier elimination mechanism eliminates the interference of abnormal data on the methane concentration, the absorption peak position and the smoke sensing value, and improves the credibility of the data.

The invention relates to a damaged wire detection method, device and system suitable for automatic wire stripping equipment and an embedded program product. The system comprises a signal acquisition module, a frequency conversion module, a digital adjustment module, a phase lock processing module, a signal output module, a buffer amplification module, a master control algorithm module, an anti-interference module and other functional modules. Through a signal acquisition unit formed by an SMA coaxial connector, an EMC protection network and a current-limiting resistor, high-sensitivity detection of capacitance change between a wire core and a cutter in a cable stripping process is realized. The RC inverting oscillator and the digital potentiometer bridge network realize frequency conversion, the phase-locked loop and the low-pass filter are combined to output an analog voltage signal, and the main control unit performs real-time threshold judgment and abnormity identification based on the signal. The system supports multi-channel detection and full-process data archiving, has the advantages of high detection sensitivity, strong anti-interference capability, adaptability to automatic high-speed takt and the like, and can realize real-time, lossless and high-reliability monitoring of cable stripping and damage in a complex industrial environment.

The present application relates to nuclear radiation detection technical field, provide a kind of nuclear measurement analog quantity transmission method based on feedback compensation circuit, the hardware part used by this method includes ARM chip, digital-analog converter, digital potentiometer, operational amplifier, isolated voltage current converter, isolation chip, A / D conversion chip, the ARM chip is connected with digital-analog converter, digital potentiometer respectively, the ARM chip is connected with A / D conversion chip after isolation chip, the first operational amplifier is connected with digital-analog converter, digital potentiometer, isolated voltage current converter respectively, the output current of isolated voltage current converter is connected with A / D conversion chip through precision resistance, second operational amplifier.The present application method can be promptly revised output current according to the comparison result of output signal and input signal, and the mode of feedback compensation is used to adjust input signal, improves output accuracy.

A kind of parallel machine current adding system belongs to the technical field of electronic equipment for measurement and testing, solve how to design a kind of hardware circuit simple, control precision high parallel machine current adding and system problem;The parallel machine current adding and system of the present application, comprising: multiple single machine current sampling circuits, parallel machine current adding and circuit;Single machine current sampling circuit includes: first differential amplifier circuit, first proportional regulating circuit, first unit inverter circuit, first digital potentiometer;Parallel machine current adding and circuit includes: instrument amplifier circuit, second proportional regulating circuit, second unit inverter circuit, second digital potentiometer and multiple proportional input end resistance;Digital potentiometer is applied to parallel machine circuit, and the resistance value of potentiometer is assigned by the number of parallel machine table set to realize the adjustment of amplification factor, replace the single proportional resistance resistance value of traditional resistance proportional circuit to realize the adjustment of amplification factor, hardware circuit is simple, amplification factor control is accurate.

An apparatus for characterizing a sample using nuclear quadrupole resonance (NQR) spectroscopy is described whereby a plurality of NQR detectors operate in tandem, whereby each NQR detector is optimized to operate within a designed frequency range, having the means to shuffle the sample from one NQR detector to the next such as an automatic sample changer, having the means of controlling the frequency and amplitude of the radiofrequency field generated by the NQR detector through motors controlling variable capacitors or through the use of varactor diodes, digital capacitors, or digital potentiometers, having a plurality of Zeeman modulation coils to create a magnetic field surrounding the sample which may be arranged to minimize stray fields, such as a toroid, having the means of operating the spectrometer in frequency modulation mode, and having the capability of configuring the device for either continuous-wave NQR or pulsed NQR.

The utility model discloses an operational amplifier power supply adjusting circuit comprising an operational amplifier tube which is provided with a power supply end and an output end; the first current converter is provided with an input end, an output end and a control end, the input end of the first current converter is coupled with a first power supply, and the output end of the first current converter is coupled with the power supply end of the operational amplifier tube; the first digital potentiometer is provided with a first end, a second end and a third end, the first end of the first digital potentiometer receives a first control signal, and the second end and the third end of the first digital potentiometer are both coupled to the control end of the first current converter. When the voltage difference between the power supply voltage of the operational amplifier tube and the voltage output by the operational amplifier tube is large, the difference between the power supply voltage and the voltage output by the operational amplifier tube can be reduced, the problem of overhigh temperature or temperature drift of the operational amplifier tube caused by overlarge voltage difference is avoided, the gain of the operational amplifier can be optimized, the signal-to-noise ratio and the sensitivity of the circuit are improved, and the reliability of the circuit is improved. And the service life of the circuit can be prolonged.

The invention discloses a portable human heart imaging hardware system based on bioelectrical impedance. The system comprises an excitation signal processing module, a detection signal conditioning module and a digital processing module. The excitation signal processing module adopts a DAC (Digital-to-Analog Converter) to generate an excitation signal, and after voltage amplification and band-pass filtering, the excitation signal drives an excitation electrode through an analog switch; the detection signal conditioning module switches a measuring electrode through an analog switch, a programmable instrumentation amplifier is combined with an RDAC digital potentiometer to realize self-adaptive gain adjustment of a detection signal, flexible gain of the signal is realized, and the signal is sent to an ADC after being filtered; the digital processing module carries out digital demodulation on the collected signals, extracts amplitude and phase information and then transmits the amplitude and phase information to an upper computer for image reconstruction. The flexible signal gain mechanism of the system realizes a full-custom signal gain curve, breaks through the fixed magnification gain limitation of the traditional integrated PGA, adapts to the impedance change of different individuals and experimental media, and improves the signal-to-noise ratio of the system, thereby obtaining more accurate cardiac impedance acquisition data.

The invention discloses a sterilized milk dynamic sterilization optimization control method and device based on efficient production, and relates to the related field of dairy product dynamic sterilization optimization control, and the method comprises the steps: respectively connecting temperature, flow, valve feedback and steam control signal links of a target sterilized milk production line in series with a digital potentiometer through an SPI control interface; obtaining a digital potentiometer array; traversing temperature, flow, valve feedback and steam control signal links to perform dynamic sterilization working condition signal time sequence monitoring; performing time sequence memory integration on the multi-source dynamic sterilization condition signal set sequence; switching action mapping analysis of the digital potentiometer array is carried out based on the state characteristics of the multi-source dynamic sterilization working condition signals, and the switching action mapping analysis is distributed to the digital potentiometer array for dynamic sterilization optimization control. The technical problem that existing dynamic sterilization control of sterilized milk is insufficient in sterilization control accuracy and dynamic response capability is solved, and the technical effect of improving the sterilization control accuracy and dynamic response capability is achieved.

The present application relates to the technical field of valve control system, disclose a kind of current signal control circuit indicating valve opening degree, including microprocessor, digital potentiometer, first voltage / current converter, second voltage / current converter, super capacitor, PWM voltage conversion chip, isolated DC / DC power module, high-speed optocoupler and relay;High-speed optocoupler, PWM voltage conversion chip, first voltage / current converter and isolated DC / DC power module form normal current signal generating circuit;Digital potentiometer, second voltage / current converter and super capacitor form abnormal current signal generating circuit;Relay is electrically connected with first voltage / current converter and second voltage / current converter respectively.The current signal control circuit indicating valve opening degree can ensure that valve control system continues stable normal operation when system power failure, low in cost, conducive to upper monitoring system timely monitoring, and quickly make response measures to abnormal state of current signal control circuit.

An apparatus comprises a microcontroller including a digital potentiometer provided in a microcontroller packaging. The digital potentiometer includes a resistor ladder including a plurality of resistors arranged in series and a plurality of selectively controllable potentiometer switches, a first resistor terminal connected to the resistor ladder, and a wiper terminal connected to the resistor ladder. The microcontroller includes a processor to transmit a wiper select signal to the digital potentiometer to selectively control the potentiometer switches to selectively connect at least a subset of the resistors between the first resistor terminal and wiper terminal, to thereby control the resistance between the first resistor terminal and wiper terminal. The microcontroller includes a first pin connected to the first resistor terminal and a second pin connected to the wiper terminal, the first and second pins being exposed through the microcontroller packaging to allow connection of the digital potentiometer to an external device.

The utility model discloses a digital voltage regulation circuit based on a permanent magnet eddy current repulsion mechanism breaker power supply. The digital voltage regulation circuit comprises a voltage regulation button S1, a voltage regulation button S2, a level conversion circuit unit, a digital potentiometer and a magnetic eddy current repulsion mechanism breaker power supply circuit unit. The voltage regulation key S1 and the voltage regulation key S2 are connected with the level conversion circuit unit, the level conversion circuit unit is connected with the digital potentiometer, and the digital potentiometer is connected with the magnetic eddy current repulsion mechanism circuit breaker power supply circuit unit; an internal memory of the digital potentiometer is utilized, and power-down storage can still be kept by a simple circuit under the conditions of not adding external storage, pure hardware and a single chip microcomputer, so that a digital key voltage regulating function is realized, and a set value is regulated to be balanced; through a simple logic circuit, a storage unit in the digital potentiometer is utilized, and a control interface of a single-chip microcomputer is also reserved, so that the defects of mechanical wear and easy environmental influence caused by long-time use of a traditional mechanical potential are overcome.

The application discloses a direct current source device and a direct current adjusting method, relates to the field of direct current tests, and comprises an isolation transformer, a rectifier bridge, a filter capacitor, a digital potentiometer, a voltage gear switching switch, a first current-limiting resistor, a second current-limiting resistor, a collection module and a control module, the collection module is used for collecting current values and voltage values, the control module is connected with the collection module, the digital potentiometer and the voltage gear switching switch respectively, an input end of the isolation transformer is connected with an alternating current source, and an output end of the isolation transformer is connected with the rectifier bridge; the rectifier bridge is connected in parallel with the filter capacitor, and then connected in series with the digital potentiometer; an output end of the digital potentiometer is connected with a common end of the voltage gear switching switch; a first movable end of the voltage gear switching switch is connected with the first current-limiting resistor, and a second movable end of the voltage gear switching switch is connected with the second current-limiting resistor; the other end of the first current-limiting resistor and the other end of the second current-limiting resistor are both connected with a positive electrode as a second load. The application realizes automatic voltage switching, meets different requirements and improves compatibility.

The utility model provides a data acquisition instrument with a hardware triggering function. The data acquisition instrument comprises an analog signal chain; the FPGA controller is electrically connected with the analog signal chain; the microcontroller is electrically connected with the FPGA controller; the isolation assembly is electrically connected with the FPGA controller; the digital potentiometer is electrically connected with the FPGA controller and the microcontroller respectively; and the protection assembly is electrically connected with the isolation assembly. According to the utility model, an external digital trigger signal / analog trigger signal is isolated through the protection assembly and the isolation assembly, so that the reliability of data is improved, and the waste of storage space and computing resources due to a large amount of low-value or unconcerned data is avoided; the FPGA controller synchronously triggers an external digital trigger signal / analog trigger signal by starting an analog signal chain, and the isolation assembly dynamically configures the digital potentiometer through the microcontroller, so that the digital potentiometer can adapt to different types and models, and further can meet scenes with high real-time performance.

The utility model discloses an automotive light sensor circuit with an automatic compensation function. The automotive light sensor circuit comprises a photosensitive element, a digital potentiometer, a PTC (Positive Temperature Coefficient) thermistor and a microcontroller, the photosensitive element, a potentiometer of the digital potentiometer and the PTC thermistor are sequentially connected in series between a power supply and the ground to form a photoelectric path; wherein a first end of the photosensitive element is connected with a power supply; the microcontroller comprises an ADC pin, a first communication interface and a second communication interface; an ADC pin of the microcontroller is connected with a second end of the photosensitive element; the first communication interface is used for being in communication connection with external equipment; and the second communication interface is used for being in communication connection with the digital potentiometer. According to the utility model, the consistency of parameters of each light sensor product is realized through automatic compensation and temperature compensation, and the functional requirement of a vehicle factory on automatically turning on and turning off a headlamp of each trolley is met.

A system (200) and method (400) for automatic calibration of stator ground fault protection for a generator is disclosed. The system (200) includes an intelligent electronic device, IED, (202) configured to operate in a first calibration mode to connect with a ground terminal (204) and in a second calibration mode to connect with a digital potentiometer (206). The system (200) further comprises a processing unit (104) to: obtain a phase angle value and a fault resistance value from the IED (202) by operating the IED (202) in its first calibration mode; determining one or more of a correct phase angle value and a correct fault resistance value of the IED (202) based on deviations from the respective desired values using linear regression algorithm (s); evaluating the determined values at different resistance values by operating the IED (202) in its second calibration mode; and configuring the IED with the correction value (202) if the evaluation for stator ground fault protection is successful.

This invention discloses a circuit and method for preventing malfunction of secondary power equipment, relating to the field of power protection technology. A global monitoring layer acquires the power system's safety thresholds. A real-time response layer collects the power system's DC grounding current and AC inrush voltage waveforms, and detects transient currents in relay (TJR) coils. A dynamic coordination layer receives the power system voltage waveforms and relay (TJR) coil transient currents. Based on the safety thresholds sent by the global monitoring layer, it dynamically adjusts resistance and capacitance parameters to optimize the filter frequency response. This protection method utilizes a programmable capacitor array and a digital potentiometer. Using an FPGA to calculate the optimal resistance and capacitance combination, the filter parameters can be adaptively adjusted based on grid interference, improving the bypass capability of high-frequency signals and rapidly triggering the bypass mechanism to prevent relay malfunctions and enhance power system reliability.