84 results about "Linearity" patented technology

The application relates to the technical field of power electronics, and discloses a press-contact type IGBT device packaging structure optimization method and system. The method comprises the following steps: constructing an equivalent model of a press-contact type IGBT device; constructing a differential algebraic equation for uniformly describing the equivalent model of the press-contact type IGBT device and circuit port variables; converting the differential algebraic equation into a nonlinear algebraic equation group through time domain discretization, and constructing an iteration matrix with a global state vector as a derivation object according to a solving mode of the nonlinear algebraic equation group; performing low-dimensional subspace projection on the iteration matrix based on a Krylov subspace, and combining residual minimization to solve a linear subproblem of the iteration matrix, so that current uniformity characteristic results of the press-contact type IGBT device are obtained; and the packaging structure of the press-contact type IGBT device is optimized based on current density distribution reflected by the current uniformity characteristic results. The application can improve the current uniformity and operation reliability of the system.

This invention discloses a frequency self-calibration circuit based on a voltage-mode RC relaxation oscillator, belonging to the field of integrated circuits. By storing time errors, it performs negative feedback control on the trigger times of the rising and falling edges of the output clock signal, automatically calibrating the output signal frequency. Furthermore, it achieves DC deviation elimination in the self-calibrating operational amplifier, significantly reducing offset voltage. This invention solves the problem of unstable signal output frequency in voltage-mode RC relaxation oscillator circuits due to changes in ambient temperature. It can be applied to Delta-Sigma ADC circuits, filter circuits, phase-locked loop circuits, etc., improving resistance to ambient temperature changes and compensating for comparator switching delays. t d This improves the linearity of the clock oscillator, enhances circuit reliability, and meets the accuracy requirements of highly integrated signal chain acquisition systems.

This invention discloses a radio frequency millimeter-wave phase-to-voltage converter, belonging to the field of radio frequency microwave integrated circuit technology. The converter includes: a first and second frequency divider chain for dividing two input signals to achieve phase compression; a first and second quadrature generator for providing a -90° linearized bias; a three-state coupling network connected between the two frequency divider chains to eliminate phase mode ambiguity introduced by the frequency dividers through reconfigurable coupled phase; and a symmetrical phase detector for converting the linearized phase difference into a voltage signal output. This invention compresses the ±180° phase difference to a small angle range using phase compression technology, combined with linearized bias to allow the phase detector to operate in the linear region, and utilizes the three-state coupling network to achieve unambiguous detection across the entire 360° phase range. Implemented using a 40nm CMOS process, it requires no external clock, has no inductor design, a core area of ​​only 0.016mm², power consumption of 22mW, a response speed of 120ns, and a linearity of 1.05% FSR.

This invention relates to the field of circuit thermal equalization analysis technology, and particularly to a method, device, equipment, and storage medium for thermal equalization adjustment of three-phase drive circuits. The method analyzes the sampling voltages of the first, second, and third phases according to a preset linear mapping formula to obtain the maximum junction temperature difference. If the maximum junction temperature difference is less than a hysteresis threshold, the reference duty cycle of the first, second, and third phases is analyzed based on the current operating conditions and a preset amplitude coefficient to obtain a thermal equalization adjustment command. By acquiring the characteristic voltage of the IGBT and obtaining the maximum junction temperature difference through linear mapping, the degree of thermal imbalance is quantified. Adjustment is triggered using the hysteresis threshold, and an equalization command is generated by combining the three-phase reference duty cycle to accurately optimize the junction temperature distribution, reduce the temperature difference, extend device life, and improve the reliability and stability of the three-phase drive circuit.

Disclosed in the present invention is a high‑linearity, high‑power GaAs HBT power amplifier having a power detection function, characterized in that: the GaAs HBT power amplifier comprises a radio frequency path, a bias module and a power detection circuit. The radio frequency path is used to perform power amplification on a radio frequency signal, a negative feedback network is used to improve the stability and expand the bandwidth, and second harmonic suppression improves the overall linearity. The bias circuit is used to provide, to a three-stage amplification circuit, a bias voltage that dynamically changes along with an input power, so as to solve the problems of linearity degradation and current instability caused by a self-heating effect in a GaAs HBT transistor under high-power input, thereby mitigating amplitude-amplitude distortion and amplitude-phase distortion of the power amplifier. The power detection circuit is used to output a direct current voltage that is positively correlated with an output power, so as to achieve accurate control of the output power of the power amplifier. By fully integrating negative feedback, dynamic biasing and harmonic suppression techniques, the present invention effectively improves the overall linearity of the amplifier.

The application discloses a CLLC resonant converter soft-start method, device, equipment and medium. The method comprises the following steps: a time domain model of a converter under PWM control is established, and a nonlinear mapping relationship between a voltage gain and a duty cycle is obtained by solving; the gain is set to increase linearly with time, and a nonlinear curve of the duty cycle changing with time is back calculated; finally, two-stage control is executed: in the first stage, the duty cycle is increased to a set maximum value according to the nonlinear curve every cycle under fixed high frequency, so that the output voltage linearly rises; in the second stage, the duty cycle remains unchanged, and the switching frequency is gradually reduced to the resonant frequency. The application can completely eliminate the current peak at the starting moment, shorten the forward starting time to one-tenth of the traditional time, realize smooth establishment of the output voltage without overshoot, and effectively reduce the high-frequency requirement of the device and the system cost.

The application discloses an equivalent sub-threshold swing regulation method of a single-gate transistor and a pixel circuit. The method comprises the following steps: obtaining a coupling control voltage based on a preset linear function relationship and a data voltage; coupling the coupling control voltage and the data voltage to obtain a coupling result; and providing the coupling result to a gate node of the single-gate transistor. The preset linear function relationship comprises a gain coefficient, and the gain coefficient is configured to program and regulate the equivalent sub-threshold swing of the single-gate transistor. Through the design of the preset linear function relationship between the data voltage and the coupling control voltage and the synergistic effect of circuit compensation, the high-precision uniformity control of the current under the low gray scale condition and the improvement of the high-resolution electroluminescent display quality are realized.

The application discloses a low-power consumption full-differential multiple harmonic IQ zero intermediate frequency mixing circuit, which comprises a quadrature all-pass filter QAF, a phase-shifting driver based on current vector synthesis, an mth harmonic frequency mixer I_MIXER based on a frequency multiplication structure and an mth harmonic frequency mixer Q_MIXER based on a frequency multiplication structure. The input local oscillator differential signal is changed into a quadrature IQ differential signal through the quadrature all-pass filter, then the driver module is used to realize the amplification signal and phase-shifting functions, generate and amplify the differential signal with the required phase, and then the differential signal is injected into the IQ mixer, and the mixer is used to realize the frequency multiplication function through the circuit structure based on the frequency multiplier and the state class B bias state of the adjusting transistor, so that the local oscillator signal is multiplied and mixed with the input RF signal. The application saves the power consumption of the frequency multiplier, effectively reduces the power consumption of the local oscillator signal link, and optimizes the linearity and noise of the mixer.

This invention discloses a time amplifier with self-cancelling quantization noise and a fractional-frequency division phase-locked loop (PLL), belonging to the field of frequency synthesis technology. The self-cancelling quantization noise time amplifier of this invention is based on a resistor-discharge type time amplifier. A control signal containing quantization error information is output through a slow-slope control signal generator to control the slow-discharge path of the time amplifier. This achieves K-fold time error amplification while simultaneously canceling fractional-frequency division quantization noise. The PLL architecture built based on this amplifier eliminates the need for a large-delay loop digital-to-time converter. The phase noise of the slow-slope control signal generator is suppressed by the time amplification gain, breaking the performance trade-off of traditional architectures. This invention achieves a low-noise, low-power, and high-linearity fractional-frequency division PLL design without degrading the performance of the time amplification phase detector.

Radio frequency systems and methods adjust power amplifier operation based on power amplifier operating mode or power level to achieve a tradeoff between improved linearity at lower power levels and improved out of band noise performance and coexistence at higher power levels.

The application relates to the technical field of electromechanical pipeline installation, and discloses an electromechanical pipeline installation auxiliary frame, which comprises a fixed plate, symmetrical fixed rails on the fixed plate, a sliding frame matched with the rails, an auxiliary frame base body fixed to the top of the sliding frame, an installation groove for accommodating electromechanical pipelines in the auxiliary frame base body, a positioning component outside the installation groove, and a positioning frame slidingly arranged on the outer wall of the auxiliary frame base body and a fixed abutting block arranged in the positioning frame. The sliding block is slidably connected with the rails, the sliding frame is moved, the position adjusting process is stable and free of jamming, and the pipeline is not accidentally pulled. The positioning slide and the sliding groove are matched, the movement of the positioning frame is guided, the linearity of the fixed point adjustment is ensured, the fixed effect is not affected by deviation, the screw is threadedly connected with the positioning frame, the lifting adjustment of the fixed abutting block is controllable, the pressure can be flexibly adjusted according to the pipeline material, and the pipeline is prevented from being excessively pressed and damaged.

This invention discloses a method for establishing a self-heating effect model. It considers the influence of different ambient temperatures on thermal resistance. In addition to testing a MOSFET at room temperature under different combinations of gate and drain voltages, it also tests it at at least one other ambient temperature. The power and self-heating temperature change values ​​of the MOSFET at multiple ambient temperatures are obtained, and the thermal resistance at different ambient temperatures is extracted. Then, the power and self-heating temperature change values ​​of the MOSFET at each different ambient temperature are fitted to obtain the coefficients of the linear model of the ambient temperature thermal resistance of the MOSFET. This model is then stored, thereby establishing a more accurate and widely applicable self-heating effect model for MOSFET devices, which can more accurately characterize the self-heating effect characteristics of MOSFETs under different ambient temperatures.

This invention discloses a fully embedded linear power flow calculation method and apparatus based on adaptive piecewise segmentation. The method includes: processing the system state... S max , S min The power flow solution at point 0 is used as the Germ solution to construct the FFHE-LPF model, update the correction coefficients, and calculate the maximum power mismatch value. When the error first exceeds 0.5%, the model is then used to calculate the maximum power mismatch value. max Record the current system status S 1 and S 2; Change the current system status S 1. S The power flow solutions at points 2 are used as Germ solutions to construct new FFHE-LPF models. The upper and lower bounds of the convergence range of these models are calculated, and the corresponding segment lengths are also calculated. l b1 and l b2 Take the segment length l c =min{ l b1 , l b2} as the basis for partitioning; based on segment length l c Divide the fluctuation range of new energy output into equal parts G The system constructs FFHE-LPF models for different sub-intervals, determines the sub-interval to which a power source belongs based on its current output, and updates the correction coefficients to obtain the power flow solution. This solution is then used to identify line overload or voltage exceedance risks in the power system. The device includes a processor and a memory.

The application relates to the technical field of power electronic control, in particular to a three-phase four-wire converter adaptive resonance control gain adjustment method and system, which comprises collecting real-time output current data of a three-phase four-wire converter, and calculating three-phase current effective values according to the number of sampling points in a power frequency cycle; performing numerical comparison on the three-phase current effective values to extract the maximum value of the three-phase current effective values; constructing a linear function relationship based on the maximum value of the three-phase current effective values and a preset proportional coefficient, and respectively calculating a fundamental frequency resonance control gain for a zero axis and a double-frequency resonance control gain for dq axes; and assigning the calculated fundamental frequency resonance control gain and double-frequency resonance control gain to a voltage loop controller in real time to update control parameters and perform closed-loop control on the converter. The application can adjust the resonance control gain in real time according to the power size.

The application discloses a PWM output angle sensor testing method, comprising the following steps: building a testing platform, obtaining the output value of the measured sensor, and calculating the duty cycle according to the output value of the measured sensor; making the duty cycle of the measured sensor 0 through motor rotation, recording and configuring the parameters of the signal generator; setting a rotation frequency threshold N, controlling the motor to drive the measured sensor to rotate synchronously at a time interval T and a rotation speed V, recording the average value of the duty cycle of the measured sensor within the time interval T and the difference between the maximum value and the minimum value of the duty cycle, and obtaining the average value of the duty cycle and the difference between the maximum value and the minimum value of the duty cycle of N points of the measured sensor; calculating the linearity according to the average value of the duty cycle of N points of the measured sensor, and evaluating the performance of the measured sensor according to the linearity and the maximum value of the absolute values of the differences of the measured sensor. The application solves the technical problem of how to accurately and efficiently test the PWM output angle sensor and improves the precision and efficiency of the test.

The application discloses a variable gain amplifier applied to a high-speed optical receiver, comprising a high gain stage, a low gain stage and a common gain load; the high gain stage comprises a high differential input pair tube and a high gain adjusting tube group connected in sequence; the common gain load is connected to the output ends of the high gain stage and the low gain stage simultaneously and is used for synthesizing the output currents of the high gain stage and the low gain stage into an output voltage; the high gain adjusting tube group has a gain adjusting voltage V ctrl1 ; the low gain adjusting tube group has a gain adjusting voltage V ctrl2 ; by independently controlling V ctrl1 and V ctrl2 , the total gain and the linearity of the amplifier can be adjusted coordinately. The application adopts the high gain stage and the low gain stage to control the circuit gain, the high gain stage provides higher gain for the circuit, and the low gain stage provides better linearity for the circuit, so that the circuit can realize high gain, and the linearity and the gain change range of the circuit are improved.

This invention discloses a voltage control method and system for a virtual synchronous generator grid-connected inverter, belonging to the field of power electronic control technology. It includes: real-time acquisition of grid-connected point voltage and current, obtaining voltage amplitude feedback through coordinate transformation, and calculating the voltage control deviation by subtracting it from a reference value; approximating the voltage control system as a first-order integrator model, reducing unmodeled dynamics, parameter uncertainties, and external disturbances to a total disturbance and expanding it into new state variables; constructing a linear extended state observer to estimate the voltage state and total disturbance in real time; employing a linear state error feedback control law to generate a virtual control quantity based on the voltage control deviation, and using the disturbance estimate as feedforward compensation to generate a virtual synchronous potential amplitude command; combining the phase angle generated by the VSG power angle frequency loop to synthesize a reference voltage, which is then pulse-width modulated to drive the inverter. This invention significantly improves the voltage dynamic response performance and robustness of the inverter under complex operating conditions through real-time estimation and compensation of the total disturbance.

The present invention relates to a method for determining insulation resistance (R1, R2) and discharge capacitance (C1, C2) for ground (PE) of an ungrounded DC power supply system, wherein a linear difference equation is implemented as a function of a measurement voltage (UG(k)) and a grid voltage (UN(k)) with a measurement voltage (UM(k)), and a grid parameter (θi) formed from a shunt (RM), insulation resistance (R1, R2) to be determined, and discharge capacitance (C1, C2) to be determined. Using N linear differential equations, a measurement value equation system is implemented with a sample sequence ((UG(k), UN(k), UM(k))) and a grid parameter (θi) for measurement times from k = 1, 2 to N with a sampling period T. Another method step comprises a step (S6) of calculating the estimated grid parameter (θi) as an approximate solution to the measurement value equation system, wherein the sum of squared errors between the grid parameter (I) and the estimated grid parameter (θi) is minimized, a step (S7) of minimizing the sum of squared errors through QR decomposition of the measurement-value matrix (Ψ), wherein the QR decomposition is recursively calculated, and a step (S8) of calculating each insulation resistance (R1, R2) and each discharge capacitance (C1, C2) from the estimated grid parameter (I) and repeating the method step with the estimated grid parameter (I), each calculated to include samples available at the current measurement time.

The application relates to a radio frequency power amplifier linearity improvement method, satisfies the requirement of a high-order modulation communication system on the linearity of a memory type power amplifier, effectively solves the problem of signal distortion caused by the nonlinearity of a radio frequency power amplifier, first, a modeling method is designed to effectively reflect the memory effect of the power amplifier and accurately describe the input-output relationship of the power amplifier, thereby providing support for subsequent predistortion design; then, a predistortion scheme is applied to adjust the input signal on the basis of the accurate model, and the predistortion scheme has the advantages of simple structure, fast calculation speed and relatively easy realization process; in addition, considering the aging and other problems in the actual use process of the device, a real-time updating measure for the predistortion adjustment scheme is designed, the adaptability of the whole system is increased, and the shortcoming that the memory type power amplifier model is only a mathematical model and cannot describe the changes in actual application is made up.

This application discloses a voltage control method and apparatus for a permanent magnet synchronous generator based on active disturbance rejection control (ADRC), relating to the field of permanent magnet generators. The method includes: constructing a first extended state observer; adjusting the derivative of the observed values ​​according to the error between the state variables and their corresponding observed values, and constructing a second extended state observer based on the first extended state observer; constructing a disturbance observer based on a second-order linear model, and compensating the disturbance observed by the disturbance observer to the second extended state observer using a compensation model to obtain a third extended state observer; and obtaining the control law for the q-axis current based on the third extended state observer. This method improves the extended state observer by addressing the error between each state variable and its observed values, effectively enhancing the system's dynamic performance. Furthermore, by using an additional disturbance observer to observe system disturbances and compensate them for by the extended state observer, the disturbance estimation burden on the extended state observer is reduced, improving the estimation accuracy.

The present disclosure relates to a system (108) and a method (700) for improving linearity of a power amplifier (PA) (312). The system (108) includes a processing engine (210) connected to an inverse coefficient estimation (ICE) module (212). The ICE module (212) is designed to capture one or more output data samples of the power amplifier (PA) (312), process the one or more output data samples to generate an error signal indicating power amplifier non-linearity, and estimate one or more parameters of a pre-distorter using a periodic prognostic error convergence (PPEC) technique based on the error signal. The estimation of pre-distorter one or more parameters involves estimating inverse coefficients using a time-varying forgetting factor λ. The ICE module (212) generates a pre-distorted input signal using the estimated one or more parameters and applies the pre-distorted input signal to the PA (312) for improving linearity of the power amplifier (PA) (312).

The application discloses a controllable series compensation sub-synchronous oscillation suppression method based on a linear active disturbance rejection control strategy, which comprises the following steps: adopting a dynamic phasor method to perform mathematical modeling on the controllable series compensation, using the principle and differential characteristics of the dynamic vector method, taking the capacitance voltage of the TCSC and the inductance current of the TCR branch as state variables to perform modeling, and obtaining a dynamic phasor model of the controllable series compensation; designing a linear active disturbance rejection TCSC controller: applying the linear active disturbance rejection control principle to the dynamic phasor model of the controllable series compensation to change the series compensation degree, taking the power on the power transmission line as an input quantity, and respectively designing a linear extended state observer and a linear state error feedback law of the linear active disturbance rejection TCSC controller to control the series compensation degree of the controllable series compensation; and in a doubly-fed wind power plant grid-connected system, the TCSC based on the linear active disturbance rejection control strategy is used to suppress oscillation. The application improves the stability of the doubly-fed wind power plant grid-connected system when small disturbance and large disturbance occur.

The application relates to the technical field of power distribution network automation, and discloses an electric variable monitoring method for the operation of a ring network cabinet, which comprises the following steps: in response to a load current change rate exceeding a preset micro-motion excitation threshold, acquiring three-phase electric variable data; calculating a reference voltage based on a circuit state equation containing a mutual inductance coupling term; constructing a rotating coordinate system with a current vector as a reference axis, performing vector decomposition on a voltage deviation vector, separating out a resistive temperature drift voltage component parallel to the reference axis, and taking a nonlinear impedance voltage component perpendicular to the reference axis as a monitoring parameter to determine a contact state; through a vector orthogonal decomposition mechanism, the application effectively decouples linear resistance drift caused by conductor temperature rise, eliminates baseline interference, can capture weak nonlinear impedance distortion characteristics caused by mechanical contact deterioration, and improves the identification sensitivity and accuracy of early latent faults of the ring network cabinet.

The application provides a sound wave acoustic black hole machining method, belonging to the technical field of pipeline acoustic black hole machining, comprising the following steps: manufacturing two semicylindrical outer pipe bodies, the inner part of the outer pipe body is provided with a plurality of annular grooves, the axial distance from the annular groove to the front end of the outer pipe body is x; manufacturing a plurality of built-in rings, the inner diameter r of all the built-in rings is a negative linear function of x; manufacturing a circular baffle; selecting part of the built-in rings, mounting the selected built-in rings in one outer pipe body, embedding each selected built-in ring into the annular groove with the corresponding axial distance, mounting the circular baffle at the rear end of the outer pipe body, and then assembling the two outer pipe bodies into a cylinder. The application has the beneficial effects that: the machining procedure is simplified by machining only simple parts, and the machining process is more convenient; the once-machined parts can be flexibly assembled to construct a plurality of SBH sample pieces with different structural sizes by reassembling the machined parts, and the application is suitable for the test research of different structural sizes of SBH.

The application discloses an in-situ self-calibration detection method of a gravity sensor, and relates to the technical field of sensing devices, wherein the gravity sensor is a MEMS tilt sensor with a self-detection port, and the method comprises the following stages: factory calibration stage: when the sensor is shipped, N groups of gradient excitation voltages are sequentially applied to the self-detection port, N is a positive integer not less than 2, output signals corresponding to each excitation voltage are recorded, linear fitting is performed on all excitation voltage and output signal data pairs by using a least square method, and a virtual scale factor and a virtual zero position of the factory calibration stage are determined according to the following linear model. The application has the advantages that: the calibration process does not need to rotate the sensor, does not need to ensure a stationary state, and does not need to disassemble the sensor back to the factory, and is completely suitable for all long-term in-situ monitoring scenes such as bridges, dams and industrial equipment, and fundamentally solves the pain point that the prior art cannot perform calibration in an in-situ scene.

The application discloses a CMOS analog switch opening control method, and relates to the technical field of CMOS analog switch circuit control. The method performs pre-opening static bias calibration on paired NMOS and PMOS switch tubes, collects real-time parameters, and establishes a reference mapping relationship of device static working points; a multi-step gate opening pulse timing is generated, which is divided into three continuous timing stages of pre-charging, linear rising and steady-state locking; the gate voltages of the two tubes are synchronously controlled in each stage to start a gate voltage dynamic clamping mechanism; the opening process is corrected by closed-loop feedback of timing and voltage parameters; and after the opening is completed, the gate voltage dynamic fine adjustment of the steady-state conduction stage is performed. The application controls the channel charge injection through the multi-step timing, improves the opening control precision through the closed-loop feedback, guarantees the steady-state working stability through the two-stage clamping mechanism, and improves the switch conduction linearity and opening consistency through the parameter adaptation of the whole process, so that the application can be adapted to complex working conditions of wide temperature range and wide power voltage.

The application provides a power system frequency measurement method and system based on the squeeze theorem, which comprises the following steps: sampling the system voltage signal in real time at a fixed sampling frequency fs; determining whether there is a zero-crossing interval according to the positive and negative signs of the sampling value; when the zero-crossing interval exists, calculating the difference value of adjacent points and judging whether the difference value of adjacent points meets a preset similarity condition; when the preset similarity condition is met, determining that the zero-crossing interval is valid based on the squeeze theorem, and calculating the accurate zero-crossing time Tn by linear interpolation; and calculating the system frequency according to the current zero-crossing time Tn and the previous zero-crossing time T0. The sine wave signal of the zero-crossing point is replaced by a linear signal by using the squeeze theorem, so that the influence of the following situations on the frequency calculation can be avoided, and abnormal situations such as burrs, jumps, communication errors, missing points and repeated points caused by electromagnetic interference can be avoided.

The application relates to a high-linearity sample-and-hold circuit for an electric energy metering chip, and belongs to the technical field of integrated circuits. The circuit aims to solve the problem of serious deterioration of linearity caused by substrate bias effect and parasitic diode leakage of a traditional sample-and-hold switch under the condition of zero common-mode voltage input. The core of the technical scheme is to introduce a dynamic substrate bias module, so that the substrate potential of a sampling tube and a reset switch can change in real time along with the input signal, and the substrate and the source-drain end are always maintained in reverse bias, and a gate voltage self-boosting circuit is combined to stabilize the gate-source voltage of the sampling tube. The design effectively eliminates threshold voltage drift and substrate leakage current under the premise of almost no increase in circuit complexity, thereby realizing high-linearity signal sampling under the condition of zero common-mode input, and significantly improving the precision and reliability of the electric energy metering chip.

The application discloses a proportional conversion circuit and method for improving linearity of platinum resistance measurement, and belongs to the technical field of precision testing; the circuit comprises two voltage proportional adjustment modules, two high-precision ADC circuits and a reference source circuit; the voltage proportional adjustment modules are used for pre-adjusting the voltages at both ends of a reference resistance and a measured platinum resistance to a similar level, and then high-precision ADC sampling is carried out, so that the combination of "coarse adjustment" and "fine measurement" is realized. The application effectively reduces the stringent requirement on the linearity of the ADC itself, significantly improves the resistance ratio measurement precision and linearity in the full range under the same hardware performance, and solves the key technical problem in high-precision measurement of a direct-current platinum resistance temperature measuring instrument.