60 results about "Equivalent input" patented technology

The invention discloses a single-port detection resonator resonant frequency on-line real-time measurement system for an MEMS gyroscope, and the system comprises a closed-loop drive circuit which is used for driving a resonator to resonate and outputting a drive detection signal; the first C / V conversion circuit converts the current into a detection voltage signal, and the on-off of the first C / V conversion circuit and the negative resistance circuit is controlled by a voltage control switch; the negative resistance circuit enables the equivalent input resistance of the first C / V conversion circuit to be a negative value so as to generate positive damping feedback force on the detection resonator; the multiplier is used for carrying out multiplication demodulation on the detection voltage signal and the driving detection signal, and the angular velocity of the MEMS gyroscope is output after the signals are filtered by the low-pass filter; the upper computer controls the on-off of the voltage control switch, the frequency fd and the frequency fs are calculated through fast Fourier transform by driving the detection signal and the detection voltage signal respectively, the frequency difference is obtained by solving the difference, and the resonant frequency of the single-port detection resonator is measured on the premise that the work of the MEMS gyroscope is not affected.

The present invention belongs to but is not limited to the field of motion control technology, and in particular relates to a high-order full-drive system control method and system for a networked multi-axis motion system, including: S1, analyzing a networked multi-axis motion system model with time delay, system uncertainty and nonlinearity, noise and external interference, giving its differential equation, discretizing it so that the system meets the full-drive conditions, and obtaining its high-order full-drive system model; S2, designing a high-order full-drive system control law, establishing a system linearized state space equation, normalizing the system time delay, system uncertainty and nonlinearity, and external interference, and processing them into system lumped interference; S3, designing a filter-based equivalent input interference estimator to achieve a good estimation of the lumped interference, and then designing a controller with interference elimination function to ensure that the networked multi-axis motion system with time delay, system uncertainty and nonlinearity, noise and external interference has control performance.

The invention belongs to the technical field of robot anti-interference, and discloses a robot active anti-interference and control method and device with preset time convergence, and the method comprises the steps: constructing an equivalent input interference state space model of a controlled system of a robot; constructing a preset time equivalent input interference estimator based on the equivalent input interference state space model; reference input of a controlled system of the robot is given, a control signal is obtained after the reference input passes through a controller, the control signal serves as input of a preset time equivalent input interference estimator, and output of the preset time equivalent input interference estimator and equivalent input interference serve as control input of the controlled system of the robot; and obtaining the output of the controlled system of the robot. According to the method, the preset time equivalent input interference estimator is designed, the reconstruction speed of the estimator on disturbance is increased, disturbance estimation errors are effectively reduced, and therefore the comprehensive performance of a robot controlled system is improved.

The invention provides a current multiplexing type output amplifier. The current multiplexing type output amplifier comprises a current multiplexing type input stage, a first self-biased diode pair, a second self-biased diode pair, a first AB type output stage and a second AB type output stage, wherein the first self-biased diode pair and the second self-biased diode pair are connected with the current multiplexing type input stage; the first AB type output stage is connected with the first self-biased diode pair; according to the invention, two self-biased diode pairs are adopted to replace a floating voltage source in the prior art. When a large pulse signal is input, one diode in each of the two diode pairs is in a cut-off state, transient change current I only flows into or out of the output end from a certain branch, and compared with a traditional amplifier, the slew rate is multiplied under the same bias current condition. In addition, the input stage adopts a current multiplexing type architecture combining a PMOS (P-channel Metal Oxide Semiconductor) and an NMOS (N-channel Metal Oxide Semiconductor), under the same bias current, the equivalent input transconductance is the sum of the transconductance of the PMOS and the transconductance of the NMOS, and the unity gain bandwidth is also multiplied.

The invention discloses a DC micro-grid power buffer safety control method and device aiming at FDI attack, and relates to the technical field of power electronics and power system control. The method comprises the steps of obtaining a block matrix of a DCmGs system node current equation according to the Kirchhoff's current law; adopting Kron simplification to eliminate internal node voltage, obtaining a relation between a port current vector and a voltage vector, and constructing a small signal model of the port voltage vector; based on a small signal model, a linear mapping relation about disturbance of bus voltage to equivalent input impedance of each power buffer is constructed, modeling and linearization are carried out on energy and adjustable input impedance of each power buffer, a network coupling small signal model is constructed, and a second-order high-gain observer is designed; and if the FDI attack exists in the DCmGs system, an anti-FDI attack elastic control law is designed, so that the closed-loop voltage in the DCmGs system and the energy of a power buffer are quickly converged, and buffeting is inhibited. By adopting the method, the DCmGs system can be prevented from buffeting in an unknown FDI attack scene.

An anti-interference control method for a permanent magnet synchronous motor driving system with output containing measurement noise comprises the following steps: when the permanent magnet synchronous motor driving system is disturbed and current is used as system output to have measurement noise, noise and disturbance suppression is realized through output filtering, an improved equivalent input interference method and control law optimization; the method specifically comprises the following steps: step 1, establishing a permanent magnet synchronous motor driving system state space model considering system state disturbance and output measurement noise; 2, introducing an output filtering strategy, transferring noisy output to a state equation, and combining a filter state and an original system state to form an extension system; 3, a traditional equivalent input interference method is improved, a parameter variable sliding mode observer is constructed to replace a state observer, and the equivalent input interference method is integrated to reduce observation errors; 4, designing a proportional-integral controller, and enabling the expansion system to output tracking reference current; and 5, constructing a Lyapunov function to perform stability analysis, and ensuring that all signals of the closed-loop system are consistent and finally bounded. According to the anti-interference control method for the permanent magnet synchronous motor driving system with the output containing the measurement noise, disturbance and noise are effectively suppressed, and the stability and the control precision of the permanent magnet synchronous motor driving system are improved.

The invention discloses a method, system and medium for a voltage clamping unit in a chip circuit, and belongs to the technical field of chip circuit protection, and the method comprises the steps: obtaining a maximum allowable voltage deviation window and a maximum allowable voltage rise rate of a target input / output pin of a chip, and constructing a target clamping characteristic parameter set; selecting a clamp sub-model based on the parameter set; adjusting capacitance matching unit parameters according to the equivalent input capacitance of the target pin by combining a support vector regression algorithm with a genetic algorithm; connecting a clamping model and injecting a test voltage waveform, and extracting clamping response time and clamping voltage to construct feedback characteristics; a mathematical model between the clamping response time and the delay gate series is generated through a symbol regression algorithm, and a control delay unit structure is corrected; according to the method, closed-loop adaptive adjustment of clamping parameters is realized, the transient interference suppression capability and clamping precision of the chip under high-frequency and low-voltage conditions are improved, and the method has good reliability and expandability.

The present invention discloses a bandgap reference circuit that generates low input offset. The circuit comprises a bandgap reference circuit, an auxiliary operational amplifier circuit, and a chopper circuit. The bandgap reference circuit includes a startup circuit, a bandgap reference core circuit, and a voltage bias circuit. The auxiliary operational amplifier circuit includes a polarity-variable transconductance amplifier for reducing voltage input offset. The chopper circuit includes a discrete-time low-pass filter and a polarity conversion switch. The discrete-time low-pass filter is used to filter out high-frequency signals output by the reference, and the polarity conversion switch is used to complete the positive-negative polarity conversion of the operational amplifier. The present invention ensures that the equivalent input offset voltage is reduced by orders of magnitude through the chopper circuit and the auxiliary operational amplifier circuit. The auxiliary operational amplifier circuit also uses output and input storage technology to ensure the low input offset of the auxiliary operational amplifier, thereby ensuring the accuracy of the output voltage of the bandgap reference circuit and providing a good bandgap reference for subsequent analog circuits.

This invention discloses a streaming computing engine system and method applicable to various scenarios, relating to the field of streaming computing technology. It includes: a mismatch assessment module for calculating the mismatch margin of the RF link based on the characteristic impedance of the RF transmission line, cable type tolerance, and the equivalent input impedance of the cellular module at the RF port; a thermal and humidity characteristic module for calculating the initial temperature difference of the metal plate penetrating the compartment in a metal control cabinet, and calculating the thermal conductivity enhancement ratio and moisture retention coefficient of the cold bridge in the condensation joint area on the metal plate penetrating the compartment; and a temperature compensation increment module for calculating the target compensation temperature increment of the metal plate penetrating the compartment based on the thermal conductivity enhancement ratio, moisture retention coefficient, and initial temperature difference of the cold bridge. This invention improves the accuracy of RF link health status determination.

The invention belongs to the technical field of analog integrated circuits, and designs a band-gap reference circuit with low noise and high power supply ripple suppression capability. The invention provides a pre-voltage-stabilizing structure to improve the low-frequency PSR. The amplification factor from the operational amplifier equivalent input noise to the reference voltage output is reduced through the voltage division ratio, and the low-frequency noise output by the reference voltage is effectively reduced through the isolation effect of the amplifier.

The present invention provides an active noise matching transformer, which can be applied to the field of transformer technology. The active noise matching transformer includes: a primary coil, a feedback module, a secondary coil, and a first active amplifier. The first end of the primary coil is electrically connected to the output end of a magnetic fluid angular vibration sensor, and the second end of the primary coil is electrically connected to the first end of the feedback module, so that the primary coil and the secondary coil are electromagnetically coupled. The two ends of the secondary coil are respectively electrically connected to the two input ends of the first active amplifier. The second end of the feedback module receives the output signal of the secondary-side loop in which the secondary coil is located, and the third end of the feedback module is grounded. The number of turns of the secondary coil and the equivalent resistance of the feedback module are configured so that, when the system voltage gain of the active noise matching transformer is equal to the target voltage gain, the equivalent input impedance of the primary-side loop in which the primary coil is located is equal to the target impedance.

An active probe disclosed by the present application comprises a first signal channel which comprises a first signal input end, a first attenuation module and a first signal output end, the first attenuation module is arranged between the first signal input end and the first signal output end, and the first signal input end accesses a first signal; the second signal channel comprises a second signal input end, a second attenuation module and a second signal output end, the second attenuation module is arranged between the second signal input end and the second signal output end, and a second signal is accessed to the second signal input end; and the capacitance compensation module is used for changing self capacitance based on setting, adjusting the overall equivalent input capacitance of the first signal channel, and / or adjusting the overall equivalent input capacitance of the second signal channel. According to the technical scheme, the capacitance compensation module can change the self capacitance based on setting, so that the overall equivalent input capacitance of the first signal channel is matched with the overall equivalent input capacitance of the second signal channel, and the problem of signal distortion can be solved.

The invention discloses a compensation loop circuit for suppressing optocoupler thermally induced gain attenuation. The compensation loop circuit comprises a voltage reference module, an optocoupler isolation module and an optocoupler input end current-limiting resistor module. In order to solve the problem of loop gain attenuation caused by the negative temperature characteristic of the current transmission ratio in a traditional optocoupler isolation compensation network, a current-limiting resistor at the input end of an optocoupler is reconstructed into a series structure and is connected with an NTC thermistor in parallel to form a temperature self-adaptive bias network, and the network can automatically reduce the equivalent input resistance of the optocoupler along with the rise of the temperature, so that the gain of the loop is reduced. The loop gain attenuation is compensated in real time, and the left shift of the crossing frequency is inhibited. According to the invention, effective compensation for the negative temperature characteristic of the current transmission ratio of the optocoupler is realized through a pure analog circuit structure, the ride-through frequency deviation of the system is effectively inhibited in a wide temperature range of 25-105 DEG C, and the gain stability and dynamic response performance of the power supply in a severe temperature environment are remarkably improved; and meanwhile, the conciseness and reliability of the traditional scheme are kept.

The application provides a true rail-to-rail input and output reference voltage buffer circuit suitable for high-precision ADC, which alternately performs a sampling phase F1 and a holding phase F2 during operation; the circuit comprises a sampling capacitor C s During the sampling phase F1, the bottom plate tracks the input reference voltage, and the top plate is reset to the ground; a level shift capacitor C LVL During the sampling phase F1, the difference between the input reference voltage and the output common-mode voltage of a transconductance operational amplifier (OTA) is synchronously sampled, and during the holding phase F2, the output voltage is connected to the output end of the transconductance operational amplifier (OTA), so as to realize the expansion of the true rail-to-rail range of the output voltage; a feedback capacitor C f During the sampling phase F1, the charge is not cleared, and during the holding phase F2, the sampling capacitor C s is connected in parallel, and the output voltage is established through charge averaging; the switch network is used for controlling the connection state of the capacitors in the sampling phase F1 and the holding phase F2. The application embodiment can realize true rail-to-rail input and output and high effective input impedance.

The application belongs to the technical field of robot anti-interference, and discloses a preset time convergence robot active anti-interference and control method and device, which comprises the following steps: constructing an equivalent input interference state space model of a robot controlled system; constructing a preset time equivalent input interference estimator based on the equivalent input interference state space model; giving a reference input of the robot controlled system, obtaining a control signal after the reference input passes through a controller, taking the control signal as an input of the preset time equivalent input interference estimator, taking an output of the preset time equivalent input interference estimator and the equivalent input interference as a control input of the robot controlled system, and obtaining an output of the robot controlled system. The preset time equivalent input interference estimator is designed, so that the reconstruction speed of the estimator to the disturbance is improved, the disturbance estimation error is effectively reduced, and the comprehensive performance of the robot controlled system is improved.

The invention discloses a low-noise electroencephalogram acquisition system based on a multi-gain active electrode, which comprises the multi-gain active electrode, an analog circuit board, a digital isolation circuit, a digital circuit board and computer end signal processing software which are connected in sequence, the equivalent input noise of the input end of the system is reduced, and the noise in the whole acquisition process of the system is further reduced. High-pass filtering is combined behind the multi-gain active electrode to reduce direct current bias and avoid system saturation, system gain correction and phase correction are adopted, low-noise and high-signal-to-noise-ratio acquisition of electroencephalogram signals is achieved while the high anti-interference capacity of the electroencephalogram acquisition system is guaranteed, technical support is provided for acquisition of high-density scalp electroencephalogram, and the electroencephalogram acquisition system is suitable for large-scale popularization and application. And high-precision electroencephalogram information decoding is realized.

The invention provides a linear equalizer, an electronic circuit and electronic equipment, in the linear equalizer, two ends of a first coupling capacitor are respectively connected with a second differential input end and a first differential output end, and two ends of a second coupling capacitor are respectively connected with the first differential input end and a second differential output end, so that the two ends of the first coupling capacitor are respectively connected with the first differential input end and the second differential output end; the first differential amplifier, the first coupling capacitor and the second coupling capacitor form an active inductor structure. On the basis, the active inductance module assists the T-shaped coil matching module, so that the equivalent input capacitance of the first differential amplifier is reduced along with the increase of the first differential input signal, thereby increasing the gain of the high frequency band in the T-shaped coil matching module and the working bandwidth of the T-shaped coil matching module. Besides, the tolerance of the matching type of the T-shaped coil matching module to the load is large, and extra nonlinearity is not introduced, so that the process deviation of the T-shaped coil matching module is small, and the process stability of the linear equalizer is improved.

The invention discloses a method for realizing full-bridge-half-bridge seamless switching of an LLC resonant converter based on hybrid modulation, and aims to solve the problems of resonant cavity energy abrupt change, output voltage fluctuation and resonant current impact caused by the difference of equivalent input voltage gain ratios of full-bridge (FB for short) and half-bridge (Half-bridge (HB for short) modes during topological switching of the LLC resonant converter. And meanwhile, the problems that the switching working frequency matching precision is low and the system is difficult to quickly enter a steady state due to lack of an FB and HB unified time domain model are solved, so that stable and efficient operation of the LLC resonant converter in a wide voltage gain range is realized. Meanwhile, according to the control method, the gain-frequency relation is solved in real time by constructing a time domain model with unified FB and HB modes, and continuous energy transition of the resonant cavity is guided in combination with hybrid modulation seamless switching control, so that the voltage gain adjustment range can be widened without introducing extra hardware, and the parameter adaptability and operation robustness of the control system are improved.

The present invention discloses an input stage circuit and an amplifier. The input stage circuit includes: an input ESD protection circuit, a DC clamping circuit, and an AC clamping circuit that are connected. The AC clamping circuit includes an auxiliary source follow circuit and a high-pass filter circuit that are connected to the input ESD protection circuit and the DC clamping circuit. The DC clamping circuit, the auxiliary source follow circuit, and the high-pass filter circuit are used to reduce the equivalent input capacitance of the input ESD protection circuit. According to the input stage circuit of the embodiment of the present invention, through the DC clamping circuit and the AC clamping circuit, the voltages across the parasitic capacitances of the respective devices of the input ESD protection circuit follow each other, suppressing the charging and discharging of these parasitic capacitances during signal input, reducing the equivalent input capacitance of the input stage circuit, and greatly improving the closed-loop bandwidth, stability, and noise performance of the transimpedance amplifier.

The invention provides a true rail-to-rail input and output reference voltage buffer circuit suitable for a high-precision ADC (Analog to Digital Converter). When the circuit works, a sampling phase F1 and a holding phase F2 are alternately executed; according to the circuit, a sampling capacitor Cs tracks input reference voltage on a bottom plate of a sampling phase F1, and a top plate is reset to the ground; the level shifting capacitor CLVL synchronously samples the difference value between the input reference voltage and the output common-mode voltage of the transconductance operational amplifier OTA at the sampling phase F1, and is connected to the output end of the transconductance operational amplifier OTA at the holding phase F2, so that the true rail-to-rail range expansion of the output voltage is realized; the charge of the feedback capacitor Cf is not reset at a sampling phase F1, the feedback capacitor Cf is connected with the sampling capacitor Cs in parallel at a holding phase F2, and the establishment of output voltage is realized through charge averaging; the switch network is used for controlling the capacitor connection state of the sampling phase F1 and the holding phase F2. According to the embodiment of the invention, real rail-to-rail input and output and high equivalent input impedance can be realized.

The application discloses a low-noise instrument amplification circuit and system adopting a cross-temperature separation structure, relates to the technical field of analog circuit design and weak signal detection, and specifically comprises a low-temperature front-end component, a room-temperature end component and a cross-temperature connection cable. The low-temperature front-end component comprises a first junction field effect transistor (JFET), a second JFET and a source coupling resistor; the room-temperature end component comprises a first JFET constant current network, a second JFET constant current network, a first drain-source bias network, a second drain-source bias network and an operational amplifier circuit. The drain and the source of the first JFET and the second JFET are electrically connected to the room-temperature end component through the cross-temperature connection cable, and a signal source is connected between the gate of the first JFET and the gate of the second JFET through a shielded differential twisted pair. The structure aims to reduce the equivalent input current noise in the signal readout with a very high impedance temperature ratio and reduce the low-temperature thermal load.

The application discloses a method for improving transient stability of a network-forming converter in an islanded alternating-current microgrid, and the method comprises the following steps: building a spatial model of the islanded alternating-current microgrid based on a model predictive control strategy, and adding an additional adjustment term in a Q-V loop of a virtual synchronous generator control mode; when a grid-connected converter generates a frequency deviation due to a fault of the microgrid, an electromagnetic torque target function minimization method is used to rollingly optimize the additional adjustment term in the Q-V loop according to angular frequency data at each moment, so that an equivalent input torque and an output torque of the network-forming converter are balanced, and thus the stability of the network-forming converter is restored. The application can effectively reduce the frequency deviation and system oscillation after the fault, significantly shorten the system recovery time, and improve the operation reliability and stability of the microgrid.

An embodiment of the present invention provides a method, device, and equipment for calibrating the gain of the reflection channel of an occultation detector. The method includes: under preset ambient temperature conditions, inputting two or more calibration sources into the reflection channel of the occultation detector respectively, and outputting the DDM noise observation values corresponding to each calibration source; obtaining the gain deviation values caused by the deviation of the AD sampling values of each calibration source from the target values; determining the equivalent noise temperature corresponding to each calibration source, and determining the equivalent input noise power based on the equivalent noise temperature; determining the total gain of the reflection channel of the occultation detector and the system noise figure based on the DDM noise observation values, the gain deviation values, and the equivalent input noise power. Through the embodiment of the present invention, the calibration of the gain of the reflection channel of the occultation detector is achieved.

This application relates to an operational amplifier circuit, an op-amp chip, and an electronic device. At the first input differential pair of the first differential input circuit, a first auxiliary differential pair of the same type but with a proportionally reduced switching transistor size is connected in parallel. The gates of the first auxiliary differential pair are connected to a first differential voltage adjustment circuit, which is configured to adjust the output voltage. When voltage offset occurs in the operational amplifier circuit, the calibration voltage between the output and the gates of the first auxiliary differential pair is adjusted to create a gate-source voltage difference, causing current imbalance between the first auxiliary differential pairs. An equivalent input offset compensation voltage is introduced into the input stage through this imbalance current. This input offset compensation voltage has the opposite polarity and direction to the offset voltage, thereby canceling out the offset voltage and achieving offset calibration. This approach achieves high op-amp offset voltage calibration accuracy while maintaining hardware cost.

The application discloses an asymmetric constant-current buffer front-end system and method based on a capacitive micro-displacement, and the method comprises the following steps: connecting a carrier excitation source to a primary coil, and connecting a secondary coil in series between an analog ground loop and a measurement loop; using an asymmetric topology structure of a composite cascade driving stage and an asymmetric push-pull output stage to complete signal conditioning work; using a T-shaped feedback network composed of resistors R5 and R11 and a bootstrap capacitor to improve the equivalent input impedance of the circuit; arranging electrodes and shielding rings on a sensor probe to improve measurement linearity; and using a mainboard as a control and processing hub, which is composed of a sine wave excitation unit, a precise demodulation and acquisition unit, an intelligent digital processing core unit and a power interface management unit. The asymmetric constant-current buffer front-end system and method have extremely high small-signal linearity, can eliminate dead-zone voltage under a micro-signal from a physical structure, have excellent long-distance measurement capability and can eliminate parasitic capacitance of a sensor probe.

The invention discloses a motor sliding mode control method and system based on an equivalent input disturbance observer. The method comprises the following steps: firstly, proposing a basic dynamic equation of the surface-mounted permanent magnet synchronous motor on a two-phase synchronous rotation orthogonal coordinate system, introducing a speed tracking error, and establishing a mathematical model of a singular perturbation system; then, an equivalent input disturbance observer is constructed and used for estimating lumped disturbance of the servo system in real time, and convergence conditions of the observer are given; and finally, obtaining the H-infinity performance of the closed-loop system based on the Lyapunov stability theory, and determining the gain matrix of the non-cascade sliding mode controller according to the corresponding linear matrix inequality. The method effectively improves the control performance and the anti-interference capability of the driving system, and is suitable for the design of a high-performance servo control system of the permanent magnet synchronous motor.

The present invention discloses a low-noise battery pack micro-internal resistance detection system, including a signal acquisition module, an excitation source module and a dual-channel isolated power supply. The dual-channel isolated power supply module provides low-noise power supplies for the signal acquisition module and the excitation source module respectively. The excitation source module is composed of a waveform generation module, a current source circuit and a drive coupling circuit, and is used to inject an AC current signal into the battery pack and provide a reference square wave signal required by the detection module. The signal acquisition module is composed of an input coupling circuit, a pre-composite amplifier circuit, a detection module, a fully differential circuit, an A / D module and an MCU module, and is used to collect and condition the response voltage signal of the battery pack and calculate the micro-internal resistance value of the battery pack. The technical solution of the present invention simplifies the front-end circuit design in the system and optimizes the system performance. It solves the defect of the traditional solution that the equivalent input noise increases due to the increase in the measuring range, and improves the overall performance and measurement accuracy of the system.

The invention provides a passive direct-current voltage sensor which is powered by a tested direct-current high voltage and comprises a voltage division circuit, an input end of which is coupled with the tested direct-current high voltage and is used for converting the direct-current high voltage into a low-voltage signal in proportion; the equivalent resistance value of the non-linear correction circuit is reduced along with the reduction of the voltage at the two ends, and the non-linear correction circuit is used for compensating the overall equivalent input impedance of the voltage division circuit and the modulation circuit during small voltage input; the load compensation circuit is used for compensating the subsequent modulation circuit when the load changes and stabilizing the output voltage; the modulation circuit is used for linearly converting a signal of the load compensation circuit into an alternating current signal and is internally provided with a high-frequency transformer for realizing electrical isolation; the demodulation filter circuit is used for rectifying and filtering the alternating-current signal into a direct-current low-voltage output signal which is in fixed proportion to the detected direct-current high voltage; and heat-conducting insulating glue is filled between the radiator and the divider resistor and is used for enhancing heat dissipation and insulation. The technical problems that accurate monitoring of weak voltage changes is not enough, and the space occupation amount of the voltage division circuit is large are solved.

The invention discloses a streaming computation engine system and method suitable for various scenes, and relates to the technical field of streaming computation, and the system comprises a mismatch evaluation module which is used for calculating the mismatch margin of a radio frequency link based on the characteristic impedance of a radio frequency transmission line, the cable type spectrum tolerance and the equivalent input impedance of a honeycomb module at a radio frequency port; the heat and humidity characteristic module is used for calculating the initial temperature difference amount of the cabin-penetrating metal plate in the metal control cabinet and calculating the heat conduction enhancement ratio and the humidity retention coefficient of a cold bridge of a condensation joint area to the cabin-penetrating metal plate; and the temperature compensation increment module is used for calculating a target compensation temperature increment of the cabin-penetrating metal plate based on the heat conduction enhancement ratio, the moisture retention coefficient and the initial temperature difference amount of the cold bridge to the cabin-penetrating metal plate. According to the invention, the discrimination precision of the health state of the radio frequency link is improved.

The present invention belongs to the field of voltage transformers and power system protection applications. To address the technical problem of difficulty in providing a voltage parameter suitable for power device decision-making during a transient response, the present invention provides a voltage measurement method and power protection method for CVT transient response. The method uses the primary voltage of the CVT as the measured quantity; establishes a discretized state-space model of the CVT equivalent circuit; uses the equivalent input voltage as the unknown input quantity, and establishes the relationship between the model output quantity, model state quantity, and the unknown input quantity; uses an unknown input observer (UIO) to estimate the unknown input quantity based on the collected model output quantity, thereby obtaining an estimated value of the equivalent input voltage; calculates an estimated value of the primary voltage based on the voltage divider ratio of the equivalent input voltage to the primary voltage and the estimated value of the equivalent input voltage, and the power protection device makes decisions based on the estimated value of the primary voltage. The present invention ensures the sensitivity and operating speed of the power protection device.