33 results about "Two-port network" patented technology

The invention relates to the technical field of electromagnetic characterization, in particular to a stable non-iterative electromagnetic parameter characterization method based on a transmission reflection method and a clamp, and the method comprises the steps: S1, loading a to-be-measured medium into a measurement clamp, dividing the measurement clamp into a to-be-measured medium region and an air region, and enabling the two regions to be equivalent to a two-port network; s2, measuring a scattering parameter S of two ports in the two-port network, and converting the scattering parameter S into an ABCD matrix form; s3, calculating an initial ABCD matrix of the to-be-measured medium according to the total ABCD matrix of the measurement clamp and the ABCD matrix of the air section; s4, calibrating the initial ABCD matrix of the to-be-detected medium, eliminating the influence of an air section, and obtaining a final ABCD matrix of the to-be-detected medium; and S5, converting the final ABCD matrix of the to-be-measured medium back to the scattering parameter S. The method is suitable for various magnetic and non-magnetic materials, and is still effective for materials with complex dielectric constant and magnetic conductivity dependent on frequency.

The invention belongs to the field of Tesla coil distribution parameter circuit model design, and discloses a Tesla coil distribution parameter circuit model based on half-wavelength segmentation. The model construction method comprises the following steps: (1) carrying out segmented modeling on a high-voltage coil according to wavelength; (2) respectively establishing a high-voltage winding circuit model and a low-voltage winding circuit model of the Tesla coil, and combining the complete Tesla coil circuit models; (3) calculating resistance, inductance, mutual inductance and capacitance parameters in the model by using an analytical expression; and (4) constructing a T parameter two-port network based on the established circuit model, and analyzing frequency characteristics such as input impedance and voltage gain. The model established by the invention can accurately analyze the frequency characteristic and the output characteristic of the Tesla coil, is wide in application range, can be applied to all specifications of Tesla coils, is high in model precision, small in error and high in operation speed, and expands the field in which a lumped parameter circuit model cannot be applied.

The invention discloses a transformer frequency response analysis method based on a digital signal filter, and the method comprises the following steps: constructing a transformer winding two-port network model with an end screen, and the distribution parameters of the transformer winding two-port network model with the end screen comprise linear resistance, inductance, capacitance and end screen capacitance; an active compensation band-pass filter is connected to an end screen branch of the passive linear two-port network of the transformer winding; and the winding deformation tester is connected between the transformer winding two-port network model with the end screen and the filter for transformer frequency response analysis. A two-port network model structure with an end screen is constructed, the model is used as a design object, a set of active digital filtering equipment and a software digital filter are formed to eliminate the influence of the end screen on the two-port network model of the main transformer winding, and a pure transformer winding frequency response characteristic curve can be obtained.

The invention provides a method for acquiring two-port network parameters of a DC / DC converter without influence of a source and a load. The method comprises the following steps: S1, acquiring DC voltage source output impedance and electronic load input admittance data in a concerned frequency band through a general test method; s2, acquiring nominal input admittance, nominal voltage gain, nominal output impedance and nominal reverse current gain data of the DC / DC converter in the concerned frequency band; and S3, drawing a control block diagram and carrying out further derivation by using a Meisson gain formula to obtain two-port network parameters of the converter. The method for acquiring the two-port network parameters of the DC / DC converter provided by the invention is not only suitable for various testing methods for acquiring the two-port network parameters of the DC / DC converter based on a general frequency response method, but also effectively peels off the port characteristic parameters of the source and the load, and more accurately depicts the two-port network characteristics of the converter.

The invention discloses a virtual two-port-based inverter impedance remodeling and network power flow control method. The virtual two-port-based inverter impedance remodeling and network power flow control method comprises a voltage source type inverter impedance remodeling method and a voltage source type inverter network power flow control method. According to the voltage source inverter impedance remodeling method, system impedance modeling is firstly analyzed, virtual two-port network parameters are designed, then a control signal is calculated and input into an original system, and impedance remodeling is completed; the voltage source type inverter network power flow control method comprises the steps of collecting data, building a line model, calculating power flow control parameters, calculating control signals, inputting the control signals into an original system, and completing power flow control. The invention discloses a virtual two-port-based inverter impedance remodeling and network power flow control method, and aims to solve the problems that parameters of existing virtual impedance control exceed an actual engineering achievable range in a strong negative impedance scene and parameter setting is complicated and stability and robustness are insufficient in an asymmetric impedance scene. According to the technical scheme of impedance remodeling, the problem is effectively solved by processing symmetric and asymmetric systems in a differentiated mode.

This invention discloses a method for predicting gate switch oscillation in GaN-HEMT devices, belonging to the field of semiconductors and power devices. The invention trains a BPNN network model to obtain a preliminary mapping relationship between parasitic capacitance and gate-source voltage based on the BPNN algorithm model. Then, a Cascode-based two-port network function for GaN HEMT is established. The parasitic capacitance value of the GaN HEMT device under all S-parameters is obtained experimentally. This extracted parasitic capacitance value is then input into the BPNN network model as a dataset to obtain Vo. GS_m V under all S parameters DS C GS C GD The relationship between the surface and the curve is shown. Simulation results show that the standard error of the prediction method of the present invention is smaller than that of ANN and PSO, proving that the detection method for GaN-HEMT gate switch oscillation based on the BPNN algorithm model of the present invention has high prediction accuracy.

According to an aspect of the present inventive concept there is provided a multistage feed network for distributing a signal stage by stage for feeding a superconducting circuit. The multiple stages of the multistage feed network are arranged in a sequential order, and a plurality of two-port networks are configured to connect to two adjacent stages in between for impedance matching. At least one stage comprises a mesh network made of interconnected superconducting wires such that incoming signal(s) of said stage can be distributed to the outgoing signals of said stage by said mesh network with a minimal deviation of signal amplitude and of signal phase.

The application discloses a kind of λ / 4 stepped impedance transformation method and system.Therein, the method includes: in the impedance mismatching of partial discharge ultrahigh frequency load impedance and the characteristic impedance of partial discharge ultrahigh frequency measurement system, access λ / 4 stepped impedance transformation two-port network, the load impedance is wave impedance;According to characteristic impedance Z 0, wave impedance Z L And the characteristic impedance of two-section λ / 4 transmission line Z 1, Z 2, determine partial voltage reflection coefficient;According to the partial voltage reflection coefficient, determine total voltage reflection coefficient;According to the total voltage reflection coefficient, broaden the working frequency band of λ / 4 stepped impedance transformer.Therefore, break through the limitation of direct matching, by the progressive stepped impedance matching mode of sensor element, realize partial discharge ultrahigh frequency signal sensor element and subsequent radio frequency processing circuit good matching, thereby reduce the partial discharge ultrahigh frequency signal attenuation caused by impedance mismatching.

The invention discloses an amplifier structure with a TL-C parallel embedded network. The amplifier structure comprises an amplifier embedded core, an input matching network and an output matching network; the input end of the input series embedded network is electrically connected with the output end of the input matching network; the output end of the output series embedded network is electrically connected with the input end of the output matching network; the input end of the parallel embedded network is electrically connected with the output end of the input matching network, and the output end of the parallel embedded network is electrically connected with the input end of the output matching network; and the input end of the active two-port network is electrically connected with the output end of the input series embedded network, and the output end of the active two-port network is electrically connected with the input end of the output series embedded network. The power gain of the amplifier can be effectively improved, and the problem that the characteristic impedance of a transmission line is low due to the fact that stray capacitance between metal and a substrate is large and the minimum width of the metal is limited by a chip design rule is effectively solved.

The operating method of an electronic device includes obtaining, by frequencies, N-1 first transmission matrices for N-1 first 2-port networks having, as two ports, i) an input of a reference element antenna, which is any one of N element antennas included in a virtual phased array antenna, and ii) an input of a just before integrated circuit (IC) driving any one of remaining N-1 element antennas, excluding the reference element antenna from the N element antennas, obtaining, by frequencies, N-1 second transmission matrices for N-1 second 2-port networks having, as two ports, an input and output of the just before IC driving each of the remaining N-1 element antennas, and performing a simulation to determine whether there is an abnormal path output based on the N-1 first transmission matrices and the N-1 second transmission matrices.

The invention discloses a cascade coupling evaluation-based three-stage motor high-frequency impedance modeling method, which comprises the following steps of: respectively defining a main motor and an exciter as a differential-mode two-port network and a common-mode two-port network, and obtaining Z parameter matrixes of the main motor and the exciter according to a mathematical equation of the two-port networks; according to a mutual conversion relation between a Z parameter and a T parameter of a two-port network, an impedance coupling model of a cascade three-stage motor formed by a main motor and an exciter is established by using the T parameter, an equivalent Z parameter matrix of differential mode impedance and common mode impedance of the cascade three-stage motor is obtained, and according to the established impedance coupling model of the cascade three-stage motor, an impedance coupling model of the cascade three-stage motor is obtained. And establishing an impedance coupling evaluation model of the cascaded three-stage motor, and establishing a cascaded coupling evaluation-based three-stage motor high-frequency impedance model structure according to an impedance coupling evaluation result of the system. Therefore, the problem that an existing motor modeling method cannot be directly applied can be solved.

The invention relates to an electronic device. The electronic equipment comprises a first antenna, a second antenna and a floor, the first antenna comprises a first radiator and a first feed source electrically connected with a feed point of the first radiator, and the second antenna comprises a second radiator and a second feed source electrically connected with a feed point of the second radiator. The first radiator and the second radiator are electrically connected with the floor; wherein the difference between the odd-mode impedance and the even-mode impedance of the two-port network formed by the first antenna and the second antenna is smaller than or equal to a first preset difference threshold, so that the first antenna and the second antenna are decoupled. By adopting the electronic equipment, the isolation between the antennas in the electronic equipment can be improved.

The invention relates to the field of communication, and discloses a filtering antenna, a filtering antenna debugging system and a debugging tool. According to the filtering antenna structure, the coupling port is introduced into the antenna radiation part of the filtering antenna or the resonator connected with the antenna, and the coupling port couples the signal from the antenna or the resonator to serve as the second port information of the filtering antenna; and forming a two-port network coupling matrix by the second port information and the first port information of the feed port of the filtering antenna. And commissioning of resonant frequency and coupling of the resonator part and the antenna part of the filtering antenna is guided through the coupling matrix. According to the filtering antenna structure, the second port information obtained through the coupling port and the first port information of the feed port can form the two-port network coupling matrix, so that the filtering antenna can be debugged like debugging a common filter structure, the debugging process is convenient and rapid, and the filtering antenna structure is suitable for the filtering antenna with a transmission zero point.

The present invention discloses a fourth-order full-pass two-port network and a construction method thereof. The fourth-order full-pass two-port network is distributed in a mirror-symmetrical manner and comprises: an inductive element L d , electrically connected between the first port and the second port; capacitive element C c and C x , two sets of capacitive elements C are connected in series c and C x are electrically connected between the first port and the first node, and between the second port and the first node respectively; the inductive element L c , two inductive elements L c Symmetrically electrically connected between the first node and the second node; the inductive element L a And capacitive component C b , two sets of inductive elements L are connected in series a And capacitive component C b Symmetrically electrically connected between the first node and the second node; the inductive element L b And capacitive component C y , inductive element L b And capacitive component C y After being connected in parallel, they are electrically connected to two sets of capacitive elements C c and C x The fourth-order all-pass two-port network of the present invention can obtain better matching bandwidth, frequency and delay performance; and the construction method is simple and easy to implement.

The invention belongs to the technical field of converter modeling and stability analysis, and particularly relates to a modeling and stability analysis method for a structure and network hybrid system. Comprising the following steps: S1, defining rotor mechanical admittance Y1GFM (s) and dynamic electrical admittance Y2GFM (s) of the network construction type converter according to a small signal model of the network construction type converter, and constructing a two-port network of the network construction type converter; s2, considering small signal disturbance of a phase-locked loop, defining rotor mechanical admittance Y1GFLs (s) and dynamic electrical admittance Y2GFLs (s) of the grid-following type converter, and constructing a two-port network of the grid-following type converter; s3, considering the influence of the power grid impedance admittance Yg (s), and determining an expression of the stability margin of the grid-following type converter; s4, establishing a three-port network in mixed connection with the network, and determining a stability criterion of the three-port network; according to the method, a more efficient and more applicable solution is provided for the stability analysis of the structure and network hybrid system, and the calculation complexity is reduced.

The invention provides an electromagnetic field simulation verification auxiliary radio frequency de-embedding method and device, and relates to the field of radio frequency de-embedding, and the method comprises the steps: constructing an overall test structure of a tested device according to a left test connection structure, a right test connection structure and the tested device; constructing a de-embedding structure according to the left side test connection structure, the right side test connection structure and the asymmetric passive device structure; solving ABCD matrixes of the left side test connection structure and the right side test connection structure based on a pre-verified passive electromagnetic field simulation environment, the asymmetric passive device structure and the de-embedding structure; generating an ABCD matrix of the overall test structure of the tested device based on the overall test structure of the tested device; and generating an ABCD matrix of the tested device and other two-port network parameters based on the ABCD matrix of the left test connection structure, the right test connection structure and the whole test structure of the tested device. According to the invention, the de-embedding network parameters of the tested device can be accurately obtained under a high-frequency condition, and the application range and the test precision of de-embedding are remarkably improved.

This invention discloses a method for correcting harmonic limits in an electrified railway traction power supply system. First, a two-port network model of harmonic propagation along the line is constructed. Then, based on the load harmonic equivalent model and differences in locomotive load capacity, voltage level, and power factor, a locomotive harmonic model is built, and all parameters are converted to the high-voltage side of the traction transformer. The harmonic voltage generated at the traction substation and the harmonic voltage generated at the grid side after the injection of harmonic current at the traction substation, as well as their ratio, are calculated. Then, based on the two-port network model of harmonic propagation along the line, the grid-side harmonic current is calculated. Finally, based on the grid-side harmonic current, the amplification factor of the grid-side output harmonic current relative to the traction substation input harmonic current is calculated, and the national standard corrected harmonic limit is calculated based on the amplification factor. This invention provides a method for correcting harmonic limits at the traction substation side, correcting the harmonic limit standard at the traction substation side of the line, and ensuring that the grid-side output harmonic current meets the national harmonic standard limits.

The invention discloses a radio frequency interconnection quality control method, device and system of a microwave circuit, and belongs to the field of electronic packaging, and the method comprises the steps: S1, determining a sampling scheme of interconnection physical mechanism characteristic quantity; s2, according to the sampling scheme, constructing a parameterized model for describing a physical structure; s3, according to the parameterized model, constructing a mapping network model from the physical structure to the electrical performance; and S4, after the mapping network model is obtained, obtaining overall microwave circuit characteristics through two-port network cascading. According to the invention, the electrical properties of physical structures with different shapes in different interconnection types can be predicted.

The invention provides a power frequency oscillation characteristic analysis method and device of a direct current power transmission system, and belongs to the technical field of power grids. The method comprises the following steps: acquiring operation parameters of a direct-current power transmission system; establishing a sending end two-port network and a receiving end two-port network according to the operation parameters of the direct current power transmission system; establishing a direct current power transmission system circuit model based on the sending end two-port network and the receiving end two-port network; determining a transfer function of the DC power transmission system according to the DC power transmission system circuit model; and analyzing the power frequency oscillation characteristics of the DC power transmission system according to the transfer function. A two-port network of a sending end and a receiving end is established, the torque-frequency characteristic of the system is analyzed by applying a circuit principle, and the method can be suitable for low-frequency dynamic analysis, so that effective measures are taken to suppress power frequency oscillation.

The present invention discloses a high-order all-pass two-port network and a construction method thereof, wherein the high-order all-pass two-port network is of order k, k≥3, and a topological circuit of a half structure in an odd-even mode comprises: when k is an odd number, a topological circuit in an even mode comprises a topological circuit in an even mode of order k-1 and an inductive element jX connected in parallel therewith. k The odd-mode topology circuit includes the k-1-order odd-mode topology circuit and the capacitive element jB connected in series with it. k When k is an even number, the topological circuit in the even mode includes the topological circuit in the k-1th order even mode and the capacitive element jB connected in series with it. k The odd-mode topological circuit includes the k-1-order odd-mode topological circuit and the inductive element jX connected in parallel with it. k The high-order all-pass two-port network of the present invention can obtain better matching bandwidth, frequency and delay performance; the network construction adopts a recursive method, which is easy to implement and can be applied to the synthesis of all-pass networks with an order greater than 2.

The application discloses a machine learning assisted modeling and synthesis method for a series feed array antenna unit. Firstly, a microstrip series feed array antenna is decomposed into three types of element units under the guidance of prior knowledge, and each element unit is regarded as a one-port or two-port network. Secondly, a machine learning algorithm is used to train S parameters and a radiation pattern of the element unit to obtain a proxy model. When the S parameters are trained, frequency is taken as a feature dimension to be added to a training set. When the radiation pattern is trained, in order to reduce training and prediction time, the real part and the imaginary part of the radiation pattern are subjected to discrete cosine transformation, and the transformed coefficients are learned. Then, the number of units of the series feed array antenna and a parameter combination are given, the S parameters and the radiation pattern of the element unit are predicted by using the proxy model, finally, the S parameter approximate value of the array is obtained by using an S parameter concatenation formula in a microwave network, and the radiation pattern of the array is approximated by using a radiation pattern synthesis formula.

The invention provides an electric energy router double-alternating-current port equivalent measurement method and device, which are suitable for the technical field of electric power systems, and comprises the following steps: determining a steady-state equivalent circuit of the electric energy router double-alternating-current port based on a pre-constructed electric energy router double-alternating-current port equivalent model; the electric energy router double-alternating-current port equivalent model is an equivalent model of a first alternating-current port, a second alternating-current port, an alternating-current load and a power distribution network of the electric energy router; when the power flow distribution of the alternating current port of the electric energy router changes, acquiring response data of voltage and current of the alternating current port of the electric energy router; and performing impedance parameter calculation based on the response data of the steady-state equivalent circuit and the voltage and current to obtain an impedance parameter of a two-port network of the double AC ports of the electric energy router. According to the method, the impedance parameter can be calculated through the power flow distribution change data and the steady-state equivalent circuit, harmonic injection is not needed, and the difficulty of stability measurement of the electric energy router is reduced.

The present invention belongs to the field of electronic components, and in particular, relates to a class-E differential colpitts oscillator, comprising a first MOS tube M1, a second MOS tube M2, a first inductor L1 to a sixth inductor L6, a first capacitor C1 to a fourth capacitor C4, a first switch capacitor array SCA1 and a second switch capacitor array SCA2. The present invention enables the oscillator to oscillate at the high frequency peak of a two-port network, thereby achieving a larger size of inductor and capacitor values, avoiding the deterioration of phase noise and tuning range in traditional structures, and significantly improving the energy efficiency of the oscillator by using a class-E structure, while also achieving a differential colpitts oscillator, and achieving a drain-gate voltage gain greater than 1 in the two-port network, which helps to reduce the noise coefficient of the oscillator.

The invention discloses an incoming end impedance calculation method of a saturable reactor broadband equivalent circuit model, and relates to the technical field of impedance analysis of a power system. In the method, a broadband equivalent circuit model of a saturable reactor in the converter valve is equivalent to a passive two-port network connected with a load; carrying out decoupling equivalent operation on inductors containing mutual inductance in the passive two-port network; taking each element except a load in the decoupled saturable reactor broadband equivalent circuit model as a two-port, and determining a transmission parameter matrix of each two-port; obtaining a transmission parameter matrix of the passive two-port network according to a two-port cascade principle and the transmission parameter matrix of each two-port; and determining the input end impedance of the saturable reactor broadband equivalent circuit model according to the relationship between the transmission parameter matrix of the passive two-port network and the input end voltage, the input end current, the output end voltage and the output end current. According to the method, the calculation efficiency of the input end impedance of the saturable reactor broadband equivalent circuit model can be improved.

The invention belongs to the technical field of alternating-current traction bilateral power supply, and particularly relates to an equivalent method of an electrified railway bilateral traction power supply system. Based on a complex structure of an electrified railway double-side traction power supply system, a primary-side three-phase power grid power transmission system is simplified, and the primary-side three-phase power grid power transmission system is equivalent to a voltage source and resistance form through a linear source-containing two-port network equivalent method and participates in secondary-side single-phase traction electrical branch load flow calculation; and further analyzing the influence on the primary three-phase power grid electrical branch caused by the access of the secondary single-phase traction electrical branch. Compared with a traditional equivalent model, the model provided by the invention is more accurate, the theoretical analysis purpose is wider and clearer, the adopted linear source-containing two-port network equivalent method greatly simplifies the secondary side single-phase traction electrical branch load flow calculation process, and the calculation efficiency is improved. And great support is provided for the scheme design of a bilateral traction power supply system of an electrified railway in future.

The application discloses a method and device for obtaining microwave heating system parameters based on field-circuit combination. The application has the characteristics of simple modeling method, intuitive and reliable model, reasonable parameter selection, etc. On the premise of retaining certain accuracy, the numerical analysis process is simplified, the problem of excessive occupation of computer processor time and memory by numerical simulation technology can be solved, the reliability of simulation results is improved, repeated simulation and test adjustment is avoided, a large amount of manpower, material resources and financial resources are saved, work efficiency and work effect are improved. Specifically: through three-dimensional modeling of the heating system, two-port network division of the three-dimensional model, and combination of field analysis and circuit analysis, the parameters of the electromagnetic field in which the whole heated material in the microwave heating system is located can be effectively obtained. The application has the characteristics of accuracy and rapidity, the difficulty of field analysis on the heating cavity is reduced, and is more suitable for engineering application.

A method for determining the stability of a multi-voltage-level DC distribution system containing multiple DC microgrids is disclosed. The method first confirms that the equivalent admittance of each microgrid subsystem has no right-half-plane poles based on the specific control mode of the interconnecting converter and the equivalent open-loop gain of each microgrid operating independently. Second, based on the two-port network matrix of the interconnecting converter, the multi-voltage-level DC distribution system containing multiple DC microgrids is simplified to a single-bus DC system containing only the distribution bus. The stability of the entire system is then determined using the equivalent impedance ratio. Under the premise that each unit within the system can operate stably independently, the stability of the entire system is guaranteed when the equivalent open-loop gain of each microgrid operating independently and the equivalent impedance ratio on the distribution bus side both satisfy the Nyquist criterion. This invention utilizes the equivalent open-loop gain of each DC microgrid operating independently and the equivalent impedance ratio of the system on the distribution bus side to analyze the stability of a multi-voltage-level DC distribution system containing multiple DC microgrids. It has good flexibility and applicability, and can provide a reliable theoretical basis for the design of multi-voltage-level DC distribution systems.

The invention discloses a line parameter identification protection method based on a two-port network model. The method comprises the steps that an impedance parameter port characteristic equation of the two-port network model is established, and measurement results of voltage and current phasors at protection installation positions on the two sides of the two-port network model are obtained; determining two-port network impedance parameters under the internal fault and the external fault according to the network line parameters; according to the two-port network impedance parameters, constructing a unified identification parameter matrix under an internal fault and an external fault; combining the unified identification parameter matrix with the measurement results of the voltage and current phasors, establishing an impedance network multi-dimensional equation of multiple phasor points, and solving parameters to be identified; and according to the solved to-be-identified parameters and fault identification criteria, internal and external faults are discriminated, and dual-terminal protection is realized. The method has high protection sensitivity in a new energy-containing access power grid, and is high in transition resistance resistance.