93 results about "Impedance transformer" patented technology

The invention discloses a broadband oscillation suppression device and method for a new energy field, and aims to overcome the defects of inaccurate monitoring and inflexible suppression measures in the prior art. The device comprises a three-phase impedor, a transformer and an equivalent power grid, the three-phase impedor is connected in series between the transformer and the equivalent power grid, the transformer is connected with a new energy field, and a voltage transformer and a current transformer are further connected between the equivalent power grid and the new energy field and used for monitoring voltage and current signals in real time and transmitting the voltage and current signals to a broadband oscillation monitor. The broadband oscillation monitor is connected with the three-phase impedor through the impedance switching loop, and the three-phase impedor is composed of an impedance unit composed of a plurality of sub-impedors and circuit breakers. Through precise monitoring and intelligent analysis, in combination with flexible impedance adjustment and a quick response control strategy, the defects of inaccurate monitoring and inflexible suppression measures in the prior art are effectively solved, and the suppression effect of broadband oscillation of a new energy field is remarkably improved.

The invention relates to the technical field of transformers, in particular to an intelligent excitation surge current identification method based on machine learning, which comprises the following steps of: firstly, constructing a simulation model of a high-impedance transformer, and optimizing the model so that the model can output an oscillogram of excitation surge current according with an experimental result according to specified input parameters; a simulation experiment is carried out on the basis, so that the difficulty and the time cost of a manual experiment are greatly reduced; processing and analyzing the data of the simulation experiment to obtain a feature vector; deep learning is carried out on the feature vectors to find the relation between the feature vectors of different parameters; and finally, decision-level fusion is carried out on the multi-modal data set, each parameter independently obtains a decision result and then is fused together, and a final waveform result is output according to positive and negative correlation gains. The prediction and identification of the excitation inrush current are realized; and a basis is provided for suppression of excitation inrush current.

The invention relates to the technical field of transformer excitation inrush current suppression, in particular to a high-impedance transformer excitation inrush current suppression method and system, and the system comprises a data collection module, a data preprocessing module, a calculation module, a main control module, an output module and an execution module. The method comprises the following steps: firstly, establishing a finite element model based on hysteresis characteristics, and collecting real operation data of a transformer and taking the real operation data as input to train the finite element model; continuously optimizing the model, and performing a simulation experiment by using the optimized finite element model to obtain simulation experiment data so as to construct a data set R, thereby greatly reducing the labor capacity of a manual experiment and quickly obtaining a large amount of simulation data; feature extraction and deep learning are carried out based on a neural network model, so that a prediction model about the excitation surge current is trained; then actual operation data of the transformer are collected, and the magnetizing inrush current is predicted by using the prediction model; and a proper closing angle or opening angle is selected to control the operation of the transformer, so that the purpose of reducing excitation inrush current is achieved.

The invention relates to the technical field of millimeter wave conversion, and discloses a millimeter wave microstrip conversion structure of a double-ridge waveguide, and the structure comprises a double-ridge waveguide port which is used for transmitting a millimeter wave signal from a waveguide structure to a lambda / 4 single-section impedance transformer; the microstrip transmission line is used for receiving and transmitting the millimeter wave signal; the lambda / 4 single-section impedance transformer is used for transition from the impedance of the double-ridge waveguide port to the impedance of the microstrip transmission line; and the capacitance compensation structure is arranged between the lambda / 4 single-section impedance transformer and the microstrip transmission line so as to compensate step capacitance caused by electric field distribution difference of different transmission lines. By means of the lambda / 4 single-section impedance transformer, balance transition of impedance in space can be achieved by means of the phase characteristic of electromagnetic waves in a quarter-wavelength structure, the return effect of reflected waves is effectively weakened, it is ensured that impedance matching of signals in high-frequency transmission is more accurate by optimizing the impedance value and the length parameter, and the signal transmission efficiency is improved. The loss of transmission energy is reduced, and the signal stability is improved.

The present invention relates to a synchrotron fast-response magnetic alloy high-frequency system, comprising: a control circuit for generating a waveform signal; a full-solid-state power source for receiving the waveform signal and performing power synthesis to generate a power signal; an impedance phase compensator for realizing impedance rise and fall and phase compensation; an impedance transformer for realizing impedance transformation to achieve impedance matching between the full-solid-state power source and the magnetic alloy-loaded resonant cavity; a magnetic alloy-loaded resonant cavity for receiving the power signal and generating a radio frequency signal to operate on the heavy ion beam; and a sampling circuit for sampling the radio frequency signal and feeding it back to the control circuit. The synchrotron fast-response magnetic alloy high-frequency system provided by the technical solution of the present invention has performance indicators of low frequency, high bandwidth, fast rising of voltage signal and response, and can output single-sine and half-sine waveforms, realizing the functions of capturing, accelerating and Barrier Bucket bunch accumulation for various heavy ion beams.

The invention belongs to the technical field of microwave antennas, and particularly provides a tight coupling phased-array antenna based on an application frequency-variable impedance matching layer, so as to solve the challenges of the existing phased-array antenna in the aspects of dynamic adjustability and environmental adaptability. The three-order Chebyshev impedance converter comprises a reconfigurable surface loaded with a diode, a bow-tie type dipole, a double-Y balun, a three-order Chebyshev impedance converter, a coaxial feed port, a metal floor, a dielectric layer, a grounding metal sheet and a metal chip resistor. The three-order Chebyshev impedance transformer, the chip resistor and the double-Y balun are cascaded to carry out broadband balanced feed on the dipole, and the dielectric constant and the magnetic conductivity of the dielectric substrate are changed through the on-off of the diode, so that the impedance matching and radiation characteristics of the phased-array antenna are improved. According to the invention, dynamic requirements of modern communication and radar systems on antenna performance can be met.

The present invention relates to the technical field of transformer excitation inrush current suppression, and in particular to a method and system for suppressing excitation inrush current of a high-impedance transformer, a data acquisition module, a data preprocessing module, a calculation module, a main control module, an output module, and an execution module. The present invention first establishes a finite element model based on hysteresis characteristics, and collects actual operation data of the transformer and uses this as input to train the finite element model; continuously optimizes the model, uses the optimized finite element model to perform simulation experiments to obtain simulation experimental data, and constructs a data set R, which greatly reduces the labor of manual experiments and can quickly obtain a large amount of simulation data; and performs feature extraction and deep learning based on a neural network model to train a prediction model for excitation inrush current; then collects actual operation data of the transformer, and uses the above-mentioned prediction model to predict the excitation inrush current; selects a suitable closing angle or opening angle to control the operation of the transformer, so as to achieve the purpose of reducing the excitation inrush current.

The invention specifically provides a low-cross-polarization ultra-wideband wide-angle scanning low-profile tight coupling phased-array antenna based on metal grid loading, and belongs to the technical field of microwave antennas. The three-order Chebyshev impedance transformer comprises a C-shaped ring metasurface loading wide-angle matching layer, a folded dipole, a double-Y balun, a three-order Chebyshev impedance transformer, a coaxial feed port, a metal floor, a metal grid, a grounding metal sheet, a resistive film, a dielectric layer and a metal chip resistor. Different polarization electromagnetic waves are regulated and controlled through the metal grid, the resistive film is introduced to absorb cross polarization components, the front-to-back ratio is improved, and the cross polarization level is smaller than or equal to-30 dB; the working bandwidth is expanded to 5.6: 1 under the condition that the profile is only 0.09 lambda by combining the size design of the non-uniform unit and the gradient balun feed, and the scanning of the wide angle of + / -60 degrees of an E surface and an H surface is supported. The invention has the advantages of compact structure, high polarization purity and wide-angle stability, and is suitable for 5G / 6G communication, radar and electronic countermeasure systems.

A single-torus ohmmeter for measuring a loop impedance Zx, includes a single transformer having a primary winding of Np coils and a secondary winding of a single coil forming the measurement loop, in which, to compensate for a stray induction produced by an AC leakage current circulating in the measurement loop without canceling a measurement current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx, the transformer includes a second secondary winding of Na coils whose output voltage Ub representative of the AC leakage current is delivered to a processing module providing a voltage intended to be added to an alternating measurement voltage Vp in an adder delivering the current to be injected into the primary winding after passage through a voltage-current converter.

The application discloses a method for simulating the parameters of a generator neutral point grounding system of an extended unit connection, which comprises an actual generator system and a simulated generator system in parallel operation, wherein the simulated generator system comprises a low zero sequence impedance transformer, a three-phase capacitor bank and a simulated generator neutral point grounding device; the parameter simulation test comprises the following steps: S1, relay protection configuration; S2, neutral point asymmetric voltage test of the generator neutral point grounding system of the extended unit connection; S3, neutral point displacement voltage test of the generator neutral point grounding system of the extended unit connection; S4, maximum capacitive current test of single-phase grounding of the generator neutral point grounding system of the extended unit connection; and S5, maximum fault current test of single-phase grounding of the generator neutral point grounding system of the extended unit connection. The application can effectively verify the grounding system performance of different grounding modes of the generator of the extended unit connection and determine whether the generator neutral point grounding mode meets the technical requirements.

The diamond sensor includes: a diamond having a color center with electron spins; a transmission circuit that transmits electromagnetic waves; an irradiation unit that irradiates the diamond with electromagnetic waves; an impedance transformer and / or a resonator; and a protection circuit for protecting an electromagnetic wave source that supplies electromagnetic waves, the protection circuit functioning as a capacitor for the electromagnetic waves and functioning as an inductor at a frequency lower than the frequency of the electromagnetic waves, and the protection circuit functioning as an inductor at a frequency lower than the frequency of the electromagnetic waves when the impedance transformer and the resonator are included. The protection circuit is disposed between the impedance transformer and the resonator, between the transmission circuit and a transmission cable connecting the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source.

A Doherty power amplifier includes a first amplifier with a first output capacitance, a second amplifier with a second output capacitance, a reconfigurable impedance inverter, and a variable output impedance transformer. The reconfigurable impedance inverter includes a combining node and first, second, and third variable networks. The first variable network and the first amplifier output capacitance establish a first amplifier effective output capacitance that is less than the first output capacitance. The second variable network provides a series inductance between the first amplifier output and the combining node. The third variable network and the second amplifier output capacitance establish a second amplifier effective output capacitance that is less than the second output capacitance. The output impedance transformer includes a fourth variable network that establishes a combining node impedance. The first, second, and third variable networks and the output impedance transformer may be reconfigured based on traffic loading conditions.

The present disclosure relates to a plasma generation system, particularly applicable to a system for semiconductor processing using plasma. The plasma generation system according to the present disclosure includes an arc suppression device coupled to an RF generator. The arc device includes a switch that is engaged based on a trigger signal. Additionally, the arc device includes a power dissipator that is engaged by the set of switches to dissipate stored and delivered energy when the set of switches is engaged. The arc suppression device further includes an impedance transformer coupled to the power dissipator to perform impedance transformation, which reduces the reflection coefficient at the input end of the device when the switch is engaged with the power dissipator. The plasma generation system also includes a matching network coupled to the radio frequency generator and a plasma chamber coupled to the matching network.

The invention relates to the technical field of synchronous particle accelerators, and provides a broadband radio-frequency voltage sampling device based on a magnetic alloy material, and the device comprises a capacitance voltage division circuit, one end of which is used for connecting a radio-frequency high-voltage end; the multiple is used for adjusting the sampling ratio; one end of the broadband impedance converter is connected with the other end of the capacitance voltage division circuit; the broadband impedance transformer comprises a first magnetic alloy ring and a first multi-core twisted wire; and the radio frequency N-type connector is connected with the other end of the broadband impedance converter, and the radio frequency N-type connector is a voltage sampling output port. According to the broadband radio frequency voltage sampling device based on the magnetic alloy material provided by the invention, the first magnetic alloy ring has very high magnetic conductivity and has a relatively low quality factor Q value, so that the broadband radio frequency voltage sampling device has an excellent broadband, and the low-frequency band characteristic of the impedance conversion circuit is greatly improved; the problem of broadband of a radio frequency voltage sampling circuit and the problem of poor performance of a low frequency band are well solved.

The invention provides a Doherty amplifier circuit and a semiconductor device. A Doherty amplifier circuit is provided with: a distributor that distributes an input signal that is input into a first signal and a second signal; a circuit board; a first amplifier which is provided on the circuit board, amplifies the first signal, and outputs the amplified signal as a fourth signal; a second amplifier which is provided on the circuit board, amplifies the second signal, and outputs the amplified signal as a fifth signal; a combining node combining the fourth signal and the fifth signal, and outputting the combined signal as an output signal to an output terminal; an open stub, an end of which is electrically connected to a path between the distributor and the first amplifier; the first end of the first impedance transformer is electrically connected to the second amplifier, and the second end of the first impedance transformer is electrically connected to the synthesis node.

To provide an impedance converter capable of obtaining satisfactory characteristics in a wide band.SOLUTION: With the impedance converter 1 in which the low-band impedance converting circuit 12 and the high-band impedance converting circuit 11 are connected in parallel between the input terminal IN and the output terminal OUT, and with a circuit configuration in which the phase of the pass characteristic of the high-pass filter formed by the high-band impedance converting circuit 11 is delayed with respect to the phase of the pass characteristic of the low-pass filter formed by the low-band impedance converting circuit 12, the phases of the pass characteristics can be matched when the frequency bands are combined. As a result, an impedance converter having favorable impedance conversion performance in a wide band is realized.SELECTED DRAWING: Figure 1

The present invention discloses a dual-polarized, wide-bandwidth, high-gain quasi-Yagi antenna for tunnel communication scenarios, comprising a guiding assembly, a cross-dipole feed and a reflector. The guiding assembly comprises three equally spaced directors, each of which comprises a guiding main pole and a plurality of guiding units arranged on the guiding main pole, and each guiding unit comprises four antenna arms; the cross-dipole feed comprises a printed substrate, a floor, a support bar and two coaxial cables; a radiation assembly is printed on the surface of the printed substrate, and the upper and lower ends of the support bar are respectively connected to the printed substrate and the floor; the coaxial cable is passed through a pre-opened perforation in the floor and then connected to the printed substrate; the floor is fixed to the reflector. The above does not require an impedance transformer to achieve impedance conversion, effectively improving the problem of narrow bandwidth of traditional Yagi antennas.

Embodiments disclosed herein may include a method for impedance match tuning. In an embodiment, the method includes setting a pin depth of a pin inserted into a hole in a dielectric resonator antenna (DRA) to adjust an input impedance of the DRA to match a load impedance of the DRA at a resonant frequency of the DRA. In an embodiment, the method further includes tuning a frequency of a microwave power amplifier that is electrically coupled to the microwave frequency to match the resonant frequency of the DRA. In an embodiment, the method further includes converting the load impedance of the DRA to a characteristic impedance of a coaxial transmission line with an impedance transformer, wherein the impedance transformer is electrically coupled between the microwave power amplifier and the DRA.

Antenna elements are described that may include a radiator, a feeding portion, a first impedance transformer, a balun, and a second impedance transformer. The first impedance transformer, balun, and second impedance transformer may be disposed above a ground plane of an antenna array to reduce a bulk of the array. The array can also include a dielectric top layer for loading apertures of the antenna array. The antenna elements can also include anomaly suppressors can be provided to cancel common-mode resonances from the radiators.

A power amplifier module includes a first amplifier that amplifies a power level of a first input signal in a predetermined frequency band and outputs a first signal of a first power level; a first impedance transformer connected to the first amplifier and including a transmission line transformer; a second amplifier that amplifies a power level of a second input signal in the predetermined frequency band and outputs a second signal of the first power level; a second impedance transformer connected to the second amplifier and including a transmission line transformer; and a combiner that combines the first signal inputted through the first impedance transformer and the second signal inputted through the second impedance transformer into an output signal of a second power level larger than the first power level and includes a transmission line transformer.

The application provides a high-selectivity and simple-structure filter power amplifier and radio frequency integrated circuit, and relates to the field of power semiconductor devices.The application provides stable gate and drain bias voltages for the power amplifier transistor through a gate DC bias network and a drain DC bias network, and guarantees stable operation of the device.The input end and the output end impedance matching network are symmetrically arranged around the power amplifier transistor, both of which contain the same filter impedance transformer, and the layout is compact and simple, without additional independent filter module, effectively simplifying the circuit structure and improving the miniaturization level.Further, the filter impedance transformer is formed by cascading two λ / 4 parallel coupled microstrip lines and is matched with a λ / 2 open microstrip line, and based on the transmission line impedance transformation principle, the filter impedance transformer realizes fundamental real impedance matching, reduces signal transmission loss, forms transmission zero points in the stop band, and significantly improves the frequency selectivity.The overall circuit has high integration, excellent performance, and good engineering application and promotion value.

The utility model discloses a body structure of a high-capacity and ultrahigh-impedance three-phase double-ring oil-immersed power transformer, which comprises an iron core assembly, a clamp assembly and a winding assembly, the clamp assembly is arranged on the periphery of an iron yoke of the iron core assembly, and the winding assembly is sleeved on a main column of the iron core assembly; iron yokes are respectively arranged at the upper and lower ends of the main column; the clamping piece assembly comprises upper webs and lower webs, and the two upper webs are symmetrically arranged on the two sides of the upper iron yoke; the two lower webs are symmetrically arranged on the two sides of the lower iron yoke. The upper web plate and the lower web plate are each of a box-shaped structure, the lower surface of the upper web plate is arranged on the center line plane of the upper iron yoke, the upper surface of the lower web plate is arranged on the center line plane of the lower iron yoke, and the lower surface of the upper web plate and the upper surface of the lower web plate are each provided with a three-phase counteracting type magnetic shield; according to the utility model, the stray loss of the metal piece on the high-capacity and high-impedance transformer body and the temperature rise of the metal piece are obviously reduced by adopting the box-shaped clamping piece, the three-phase counteracting type magnetic shielding structure and the like.

The present invention relates to a low-frequency, broadband, high-power, compact impedance transformer, comprising a rectangular coaxial impedance transformer and a coaxial quick-connect connector connected to the rectangular coaxial impedance transformer. The rectangular coaxial impedance transformer comprises a base plate and a cover plate, which are fixedly connected by bolts. An inner conductor is provided at the upper end of the base plate, and an interface is provided at the lower end of the base plate, through which the coaxial quick-connect connector connects to the inner conductor. The present invention employs a rectangular coaxial coiled structure for the impedance transformation section of the inner conductor to reduce its axial length. The inner conductor is disposed on a dielectric plate C and secured via a dielectric plate D, thereby resolving the difficulty of mechanically processing the dielectric plate D. Furthermore, the overall compact design meets the client's requirements for a smaller installation space.

The application discloses a balanced-to-balanced coaxial line impedance transformer, and belongs to the electronic technical field.The coaxial line impedance transformer is composed of four coaxial lines with the same characteristic impedance and electrical length, the coaxial line has an inner conductor and an outer conductor, the coaxial line impedance transformer has two balanced radio frequency ports Z L and Z H , and the 2.25:1 Z H / Z L impedance transformation ratio is realized by connecting the inner conductor and the outer conductor between different ports of the four coaxial lines.The application breaks through the minimum impedance transformation ratio of 4:1 that can be realized by the prior art, can satisfy the impedance transformation requirement below 4:1, can be combined with other impedance transformers to realize the impedance transformation ratio with smaller discrete value, is helpful to the miniaturization, low insertion loss and multi-path power synthesis scheme, and can satisfy the high power and high efficiency application demand above 2kW.

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 belongs to the field of broadband power amplifiers, and particularly relates to a broadband impedance converter. The circuit comprises an input impedance converter, an input matching unit, a driving power amplifier, an inter-stage matching unit, a final-stage power amplifier and an output impedance converter. According to the invention, based on the HBT technology, coupling among multiple layers of metal is utilized, so that an ultra-wideband impedance converter is realized; the broadband impedance transformer can provide a required load line for the power amplifier in a very wide frequency band range; the broadband impedance converter can simplify the input matching of the ultra-wideband power amplifier and reduce the design complexity. Based on the impedance transformer and the ultra-wideband power amplifier structure, the designed wideband amplifier is high in bandwidth, high in efficiency, simple in design and small in area.

The invention discloses a microwave transmission frequency increasing method and device, and the method comprises the following steps: collecting basic parameters of a microwave transmission line, calculating the initial wavelength of the microwave transmission line, and carrying out the standing wave analysis; designing a multi-mode interference device structure according to the initial wavelength, calculating a coupling coefficient between waveguides of the multi-mode interference device, and optimizing the waveguide layout according to the coupling coefficient; improving the microwave transmission frequency of the microwave signal optimized by the multimode interference device by using a frequency modulation algorithm; a matched impedance transformer is designed to improve the transmission power in the microwave signal transmission process; and the feedback control module monitors the bit error rate of the microwave transmission signal in real time, and adjusts the multimode interference device and the impedance converter according to the bit error rate. The multi-mode interference device and the impedance transformer are designed, and the parameters of the multi-mode interference device and the impedance transformer are adjusted in real time, so that the transmission frequency of microwave transmission is improved.

This invention relates to the field of graded impedance converter technology, and more particularly to a graded impedance converter and its processing method. The graded impedance converter includes: a graded section consisting of a beveled outer conductor and a core wire passing through the interior of the beveled outer conductor, and an assembly section disposed at one end of the graded section. The processing method includes: mixing and curing polytetrafluoroethylene (PTFE) dispersion powder with an extrusion aid to form a blank; extruding the blank through an annular gap while simultaneously coating the inner conductor to form a wet blank insulation layer; during the extrusion process, adjusting the extrusion speed according to the temperature anomaly region, adjusting the preheating temperature according to the interface distance between the rigidity anomaly region and the inner conductor, and compensating the extrusion pressure of the annular gap according to the vibration intensity and the area of ​​the rigidity anomaly region; subsequently, drying, sintering, copper tube drawing and beveling, and assembly are performed to obtain the graded impedance converter. This invention achieves continuous impedance transformation of the graded impedance converter.

This invention proposes a feed network and its design method for a multi-band common-aperture satellite communication antenna, relating to the field of satellite communication technology. This invention employs a three-dimensional heterogeneous layout, placing the low-frequency and high-frequency feed networks on the bottom and top layers of a multilayer dielectric substrate, with a shared ground layer in between. This effectively solves the problem of large space occupation in traditional discrete layouts. For the low-frequency network, characteristic mode theory guides the microstrip feeder design, and a stepped impedance transformer is loaded at the terminal, enabling good impedance matching for low-frequency signals across a wide bandwidth. For the high-frequency network, substrate-integrated waveguide technology is used to construct the signal transmission trunk and coupler gaps are set. Finally, a defective ground structure and a frequency-selective surface are simultaneously integrated on the shared ground layer through a single photolithography process. This allows the design to simultaneously achieve the dual functions of suppressing low-frequency leakage and transmitting high-frequency signals on the same physical layer.

An impedance matching network (10) for an active RFID transceiver (1), the impedance matching network (10) including: an impedance transformer (14) including a transformer input (13) and a transformer output (15), wherein the transformer input (13) is connectable to an antenna (12), an RF modulator (16) connectable to the transformer output (15), and an RF demodulator (20) capacitively coupled to the transformer output (15) via a capacitor (18).