56 results about "Linear circuit" patented technology

The invention provides a self-powered circuit of a switching power supply and the switching power supply, and the self-powered circuit comprises a first linear voltage stabilizing circuit which is connected between a common connection end of a main power tube and an auxiliary power tube and a power supply capacitor; the second linear voltage stabilizing circuit is connected with the second linear circuit in parallel; the adjusting circuit is connected with the second linear voltage stabilizing circuit and generates adjusting voltage to adjust the first charging current flowing through the second linear voltage stabilizing circuit when the second linear voltage stabilizing circuit is switched on; wherein after the switching power supply is started, the first linear voltage stabilizing circuit is switched on, and the power supply capacitor is charged; and when the PWM signal generated by the control chip of the switching power supply is effective, the second linear voltage stabilizing circuit is controlled to be switched on. According to the invention, power supply loss can be saved and system EMI can be optimized.

A method is performed at least partially by a processor and includes, based on design specifications of a voltage regulator, determining parameters of the voltage regulator. The method further includes, based on the parameters of the voltage regulator, determining model parameters of a voltage regulator (VR) model of the voltage regulator. The VR model is free of non-linear circuit components. The method further includes performing a simulation of the voltage regulator, using the model parameters of the VR model.

The invention discloses a sequence immittance modeling and stability analysis method for a heterogeneous new energy grid-connected power system, and belongs to the technical field of power system control, and the method comprises the steps: carrying out the two-port equivalence of each converter in the heterogeneous new energy grid-connected power system, and adding voltage disturbance to an AC port and a DC port; further modeling respective control rings and nonlinear circuits of various converters under current response of voltage disturbance to obtain an initial transfer function of a sequence immittance model corresponding to each frequency coupling component, fully considering the interaction between the following / constructing network type converters, revealing the frequency coupling rule of the converters, and improving the reliability of the converter. The accuracy of the sequence immittance model is improved; and correcting the initial transfer function of the sequence immittance model corresponding to each frequency coupling component by using the corrected sequence immittance circuit equation to obtain the corrected transfer function of the sequence immittance model of each frequency coupling component, and accurately carrying out linear modeling on the sequence immittance of the heterogeneous new energy grid-connected power system.

A semiconductor laser and a photonic nonlinear circuit chip are integrated together. The nonlinear circuit chip may include a nonlinear waveguide configured or controlled to enable sum-frequency generation, difference-frequency generation, second-harmonic generation, parametric amplification, or other nonlinear processes. Coupling between the semiconductor laser and the nonlinear circuit may be optimized by mode-matching, while back-reflections are minimized by diverting the reflections so that optical isolators are not needed. The integration of the semiconductor laser and the nonlinear photonic circuit chip enables nonlinear optical processing using a compact and scalable platform in a flexible manner that is compatible with different types of semiconductor lasers and different operation regimes. An additional input is provided so users can input an optical signal into the photonic chip for processing therein. In some examples, the photonic chip is configured with pump resonators, such as racetrack resonators. Method and device examples are described herein.

A simulation system and method for implementing a model based on an iterative neural network, the system comprising: a simulation vector-matrix multiplication circuit that encodes a weight matrix of the model based on the iterative neural network; and an analog non-linear circuit that encodes a non-linear function arranged in a feedback loop configured to return an output signal from the non-linear circuit as input to the vector-matrix multiplication circuit, wherein the system is configured to output a solution vector of values of the model based on the iterative neural network upon convergence of the system.

The invention provides a computer readable storage medium, an estimation method, and an estimation apparatus. A computer-readable storage medium causes a computer to function as: an acquisition unit (22) that acquires first information pertaining to a linear circuit having a plurality of ports for inputting or outputting a high-frequency signal and second information pertaining to the frequency of the high-frequency signal; an estimation unit (24) estimates an S parameter for two ports among the plurality of ports at the frequency on the basis of a learned model on the basis of the first information and the second information, and a restriction unit (26) restricts the S parameter within a range when the second information indicates that the frequency is 0 Hz and the estimated S parameter is outside the range.

The present invention discloses a method and device for sequence impedance modeling of a network-forming converter, belonging to the technical field of power system control. The method includes: adding voltage disturbances to the AC port and DC port in the equivalent two-port network of the network-forming converter to be analyzed and modeled; performing frequency coupling analysis on the non-linear circuit under the current response of the voltage disturbance to model the initial transfer function of the sequence impedance model corresponding to each frequency coupling component, fully considering the interaction between network-forming converters, revealing the frequency coupling law of the converter, and improving the accuracy of the sequence impedance model; using the control equation of the network-forming control loop model corresponding to the control loop sequence impedance to remove the zero-sequence component in the circuit equation of the non-linear circuit to obtain a modified sequence impedance circuit equation, which can reduce the complexity of modeling calculation; using the modified sequence impedance circuit equation to modify the initial transfer function of each sequence impedance model to accurately perform linearized modeling of the sequence impedance of the network-forming converter.

An AC current of multiple frequencies is setup in a body to be sensed, and amplitudes and phases of AC voltages at many electrodes attached to the body are detected simultaneously. At electrode measurement circuits, each of multiple modulating signals is mixed separately with the electrode signal using non-linear circuit components such as transistors or diodes. The output of this mixed signal is stored as a charge, in a capacitor or a semiconductor device (e.g. a CMOS transistor) that can store charge when in a certain state. Upon assertion of a readout signal, the charge is converted back into voltage and sent out on an analog voltage output line from which it is read using ADCs.

The present invention relates to a data-driven state feedback control method and device for a periodic piecewise linear circuit system. The method comprises: constructing a periodic piecewise linear closed-loop system model to obtain basic system information; performing input-output experiments on each subinterval to obtain input-output data that satisfies a response rank condition; describing the system dynamics of the linear system on the subinterval based on the input-output data with sufficient excitation, and obtaining the closed-loop characteristics of the system represented by the input-output data; constructing a Lyapunov function of the closed-loop periodic piecewise linear system, and using the Schur complement equivalence to construct the stability condition of the linear matrix inequality for the Lyapunov function; substituting the obtained input-output data into the stability condition to solve the controller gain matrix; and substituting the controller gain matrix back into the closed-loop system model to converge the state variables to an equilibrium point. The present invention adopts a data-driven approach to achieve effective control under unknown system parameters and achieve fast and flexible convergence.

The invention discloses a high-efficiency and high-linearity circuit with self-adaptive nonlinear compensation. The high-efficiency and high-linearity circuit comprises a dynamic bias circuit unit and a radio frequency amplification circuit unit, the dynamic bias circuit unit comprises a first bias transistor and a first bias circuit, and an external Vg'direct current voltage source is connected to a grid electrode of the first bias transistor through the first bias circuit; the radio frequency amplification circuit unit comprises a second bias transistor, an input matching circuit and an output matching circuit; an external Vg direct-current voltage source is connected to the grid electrode of the second bias transistor through the input matching network; an external Vd direct-current voltage source is connected to the drain electrode of the second bias transistor through the output matching network; an input signal RFin sequentially passes through the input matching network, the second bias transistor and the output matching network to amplify an output signal RFout. According to the invention, different bias states can be realized at different injection powers, so that the efficiency and linearity in saturation and rollback states are effectively improved.

The present invention discloses a switch clock circuit, including an integrated circuit chip unit, a clock input circuit unit connected to the integrated circuit chip unit, and a filtering and voltage stabilizing circuit unit, wherein the integrated circuit chip unit includes a chip, the clock input circuit unit is provided with a clock oscillator X1, and the clock oscillator X1 provides an active clock oscillator with a predetermined fluctuation frequency for the chip, the filtering and voltage stabilizing circuit unit includes an isolation element and a filtering component both connected to the chip, the chip U1 is connected with a coupling and direct-isolation circuit unit, the coupling and direct-isolation circuit unit outputs multiple LVDS differential clock circuits, and also includes a synchronous clock input unit for adjusting the output clock deviation. With such a configuration, multiple differential clocks of different forms can be output to the load end, and the clock accuracy is high and the signal is stable.

The embodiment of the invention provides an integrated circuit design system and method and a computer program product. The method is performed at least in part by a processor and includes determining a parameter of the voltage regulator based on a design specification of the voltage regulator. The method further includes determining model parameters of a voltage regulator (VR) model of the voltage regulator based on the parameters of the voltage regulator. The VR model does not contain a non-linear circuit assembly. The method further includes simulating the voltage regulator using the model parameters of the VR model.

In one example, a receiver includes: a front end circuit to convert a radio frequency (RF) input signal into at least one frequency signal; a non-linear circuit coupled to the front end circuit, the non-linear circuit to generate at least one shaped frequency signal from the at least one frequency signal according to at least one non-linear transfer function; and a modulation signal detector coupled to the non-linear circuit to output a likelihood signal based on the at least one shaped frequency signal.

To provide a nonlinear compensation device, a nonlinear compensation method, and a program for appropriately updating a parameter even when a reference signal cannot be used every time.SOLUTION: A nonlinear compensation device 200 includes a plurality of nonlinear circuits 201 - 1 to 201 - N that output signals obtained by adding nonlinear characteristics to reception signals transmitted by a transmitter and received by a receiver, a linear circuit 202 that outputs a sum of values obtained by multiplying outputs of the plurality of nonlinear circuits by weighting coefficients as a compensation signal, and a first learning unit 204 that sets at least one of parameters of the nonlinear characteristics of the plurality of nonlinear circuits and the weighting coefficients of the linear circuit on the basis of an error between the compensation signal and a reference signal. And a second learning unit 203 that changes each weight coefficient of the linear circuit 202.SELECTED DRAWING: Figure 3

The invention relates to a low-ripple bipolar constant-current power supply applied to a particle accelerator. The low-ripple bipolar constant-current power supply comprises a direct-current voltage input unit, a Buck circuit unit, a microprocessor, an adjustable linear circuit unit, a bipolar control circuit unit, a voltage and current sampling circuit unit and a bipolar current output unit which are connected in sequence. The low-ripple bipolar constant-current power supply device manufactured by adopting the technology has the advantages of small volume, low output ripple, good stability and strong anti-interference capability, the long-term operation stability can reach within 100ppm, and the low-ripple bipolar constant-current power supply device has a bipolar output function and can output positive current and negative current.

A non-transitory computer-readable recording medium having stored therein a program causes a computer to execute a process. The process includes acquiring first information related to a linear circuit having a plurality of ports for receiving or outputting a high frequency signal, and second information related to a frequency of the high frequency signal, estimating, when the second information indicates that the frequency is 0 Hz, an S-parameter for two ports of the plurality of ports when the frequency is 0 Hz, from the first information based on a first learned model, and estimating, when the second information indicates that the frequency is other than 0 Hz, an S-parameter at the frequency from the first information and the second information, based on a second learned model. The first and the second learned models are generated by performing machine learning on plural pieces of first training data and second training data, respectively.

The application provides a self-powered circuit of a switching power supply and the switching power supply. The self-powered circuit comprises a first linear voltage stabilizing circuit connected between a common connection end of a main power tube and an auxiliary power tube and a power supply capacitor; a second linear voltage stabilizing circuit connected in parallel with the second linear voltage stabilizing circuit; and an adjusting circuit connected with the second linear voltage stabilizing circuit, which generates an adjusting voltage to adjust a first charging current flowing through the second linear voltage stabilizing circuit when the second linear voltage stabilizing circuit is turned on. When the switching power supply is started, the first linear voltage stabilizing circuit is turned on, and the power supply capacitor is charged. When a PWM signal generated by a control chip of the switching power supply is valid, the second linear voltage stabilizing circuit is turned on. The application can save power supply loss and optimize system EMI.

Disclosed are a continuous-time delta-sigma analog-to-digital converter and an operation method thereof. More particularly, a continuous-time delta-sigma analog-to-digital converter, including: a linear integrator configured to generate a first output signal corresponding to a preset input voltage based on an operation of a linear Gm circuit that receives the preset input voltage; and a quantizer configured to generate a second output signal corresponding to the first output signal based on an operation of a body-driven VCO that receives the first output signal and to generate a digital output code corresponding to the second output signal based on an operation of a Frequency to Digital Converter (FDC) that receives the second output signal is disclosed.

The invention relates to a data driving state feedback control method and device of a periodic piecewise linear circuit system. The method comprises the following steps: constructing a periodic piecewise linear closed-loop system model, and obtaining system basic information; performing an input and output experiment on each subinterval to obtain input and output data meeting a response rank condition; according to the input and output data with enough excitation, describing the system dynamics of the linear system on the subintervals, and obtaining the closed-loop characteristics of the system represented by the input and output data; constructing a Lyapunov function of the closed-loop period piecewise linear system, and constructing a stability condition of a linear matrix inequality for the Lyapunov function by adopting Schel complement equivalence; substituting the obtained input and output data into a stability condition to solve a gain matrix of the controller; and substituting the gain matrix of the controller back to the closed-loop system model to converge the state variable to a balance point. According to the method, a data driving mode is adopted, effective control under unknown system parameters is achieved, and rapid and flexible convergence is achieved.

The invention discloses a model order reduction method and system for a multi-port linear circuit, a terminal and a computer readable storage medium, and the method comprises the steps: obtaining a to-be-reduced-order circuit model, carrying out the port number reduction of the to-be-reduced-order circuit model according to a port reduction strategy, and obtaining a target circuit model; a target mapping equation is constructed based on the target circuit model, a residual module and a tensor mapping structure, the tensor mapping structure is used for representing the correlation between the circuit model to be subjected to order reduction and the target circuit model, and the residual module is used for predicting corresponding output according to the input; generating a training data set according to the to-be-reduced-order circuit model, and training a residual module and a tensor mapping structure in the target mapping equation to obtain a trained target mapping equation; and generating an order reduction result according to the target circuit model and the trained target mapping equation. According to the method, the trained target mapping equation can be adopted on the basis of the target circuit model, so that the precision of the multi-port model after order reduction can be improved.

To provide a program, a method, and a trained model for improving the accuracy of an S-parameter of a high frequency circuit.SOLUTION: An estimation apparatus 20 functions as: an acquisition unit 22 which acquires first information pertaining to a linear circuit having a plurality of ports for receiving or outputting a high frequency signal, and second information pertaining to a frequency of the high frequency signal; a first estimation unit 24 which estimates, when the second information indicates that the frequency is 0 Hz, an S-parameter for two ports of the plurality of ports when the frequency is 0 Hz, from the first information based on a first trained model; and a second estimation unit 26 which estimates, when the second information indicates that the frequency is other than 0 Hz, an S-parameter at the frequency from the first information and the second information, based on a second trained model.SELECTED DRAWING: Figure 8

A non-transitory computer-readable recording medium having stored therein a program causes a computer to execute a process. The process includes acquiring first information related to a linear circuit having a plurality of ports for receiving or outputting a high frequency signal, and second information related to a frequency of the high frequency signal, estimating an S-parameter for two ports of the plurality of ports at the frequency, based on a learned model, and when the second information indicates that the frequency is 0 Hz and the estimated S-parameter is out of a range, restricting the S-parameter to be within the range. The learned model is generated by performing machine learning on a plurality of pieces of training data. The plurality of pieces of training data defines a relationship among a plurality of pieces of first information of the linear circuit, a plurality of frequencies, and a plurality of S-parameters.

The present invention particularly relates to the technical field of analog circuit numerical simulation. Provided are a large-scale linear circuit simulation method and system, a circuit simulator and a storage medium. The present solution comprises: constructing an ordinary differential equation of a linear circuit, and on the basis of an Euler iteration method, converting same into a large-scale sparse linear equation system; using a graph partitioning algorithm to rearrange rows and columns of a coefficient matrix of the equation system, so as to obtain a doubly bordered diagonal matrix; using a plurality of computing nodes to constitute distributed nodes, solving local Schur complements of the distributed nodes by means of parallel computation, and summing same to obtain a global Schur complement; and on the basis of the global Schur complement and the state of each distributed node at a previous moment, obtaining the state of each distributed node at a current moment, so as to obtain a large-scale linear circuit simulation result. The present solution can control the number and size of blocks of circuit matrixes, and can remarkably improve the circuit simulation efficiency while ensuring smooth execution of simulation processes.

The present invention discloses an NLADRC voltage control method for an efficient power converter for electric vehicles, which relates to the technical field of NLADRC voltage control for efficient power converters for electric vehicles, and includes establishing an equivalent model of a CLLLC resonant converter based on the fundamental wave analysis method; solving the voltage gain by using a linear circuit solution method through the FHA equivalent model of the CLLLC resonant converter; and establishing an improved anti-integral saturation NLADRC voltage control strategy. The method of the present invention significantly improves the anti-disturbance ability and stability by applying an improved non-linear auto-disturbance rejection control strategy with anti-integral saturation. By using a non-linear filtering function, this strategy effectively suppresses the fluctuations in the response, accelerates the stabilization speed, and improves the overall control stability and robustness.

The utility model discloses a linear circuit board surface coating device which comprises a support, a PVC conveying belt and a roller conveying belt are arranged above the support, the PVC conveying belt is located on the left side of the roller conveying belt, a top frame is arranged above the right side of the support, and a coating machine nozzle is installed at the top of the top frame; the roller conveying belt comprises a fixed roller and a movable roller, the movable roller is arranged in the middle of the fixed roller, a spring is connected to the outer side of the movable roller, and an extrusion column is connected to the outer side of the middle of the movable roller; and the spraying machine body is arranged on the rear side of the middle of the support, and the spraying machine body is electrically connected with the pressure switch. According to the linear circuit board surface coating device, a circuit board can be linearly conveyed and coated, assembly line is facilitated, spraying machine nozzles are arranged on the top frame at equal intervals, comprehensive spraying of the circuit board is facilitated, and the spraying time is saved.

According to the double-bus GIS system, the arrangement structure of the buses in the GIS system in a double-bus arrangement mode in the prior art is changed, the linear disconnecting switches and the linear circuit breakers are adopted, the linear circuit breakers are arranged in the transverse direction, wiring ports of the linear circuit breakers are formed in the planes of the two ends, and the linear circuit breakers are arranged on the planes of the two ends. One end of the linear circuit breaker is connected with a main bus through linear disconnecting switches, the other end of the linear circuit breaker is provided with a T-shaped adapter, two adapter ports which are oppositely arranged are arranged in the longitudinal direction, the linear disconnecting switches are installed on the two adapter ports, and the end adapters are installed on the two linear disconnecting switches. The branch bus passes through the end part adapter and is arranged along the transverse direction, connection structures of all elements in the GIS are vertically arranged, and if a basin-type insulator needs to be installed, the basin-type insulator is also vertically arranged, so that transverse arrangement of the basin-type insulator is avoided, and potential safety hazards caused by dust deposition and discharge of the basin-type insulator are reduced.

A device includes an adaptive power limitation circuit configured to automatically determine active phases of a DCDC converter based upon power level of the DCDC converter. The adaptive power limitation circuit includes a translinear circuit configured to convert the power level of the DCDC converter to a current level and a clamping circuit, operatively connected to the translinear circuit, configured to clamp a maximum output current of the adaptive power limitation circuit to a predetermined value.

To solve a problem with a nonlinear circuit in which the output power decreases when the frequency band of the generated signal becomes high.SOLUTION: In a nonlinear circuit having a nonlinear element portion, the nonlinear element portion includes a transistor and a transmission line, the back gate of the transistor is connected to the transmission line, the transmission line is connected to ground, and has a total length based on the wavelength λ of a transmission signal transmitted to the nonlinear circuit, and the total length is equal to or greater than 0.8×λ / 4 and equal to or less than 1.2×λ / 4.SELECTED DRAWING: Figure 1

To provide a square root circuit capable of generating a highly accurate output value by suppressing and reducing the influence of a base current error.SOLUTION: In the square root circuit, a translinear circuit is configured by the first transistor 1 to the fourth transistor 4 using NPN bipolar transistors, and the fifth transistor 5 to the seventh transistor 7 using NMOS transistors are provided so that a base current error of the first transistor 1 to the fourth transistor 4 does not directly appear in the output current IOUT, and even if there is a base current error, the output current IOUT accurately proportional to the square root of the input current IIN is obtained.SELECTED DRAWING: Figure 1