155 results about "Active load" patented technology

A measurement system includes a signal analysis circuit, a signal generator circuit, a control circuit, and a DUT connector. The DUT connector is connectable to a device under test for receiving a measurement signal outputted by the DUT. The signal analysis circuit is connected to the DUT connector for receiving the measurement signal. The signal generator circuit is configured to generate a radio frequency (RF) test signal that is transmitted to the DUT. The signal analysis circuit is configured to digitize the measurement signal, thereby obtaining a digitized measurement signal. The control circuit is configured to control the signal generator circuit to generate the RF test signal based on the digitized measurement signal, based on known error parameters of an error model of the measurement system, and based on a desired reflection coefficient at a reference plane associated with the DUT.

A load connection state detection method for an energy storage power supply. The energy storage power supply comprises an inverter power supply. The method comprises the following steps: sampling an output voltage and an output current of the inverter power supply, and calculating output apparent power (S1); and determining whether the apparent power is less than a preset power threshold; if the apparent power is greater than the preset power threshold, a detection result being that a load is connected to the energy storage power supply; and if the apparent power is less than the preset power threshold, executing an active load online detection algorithm for secondary detection, and according to the secondary detection result, determining whether a load is connected (S2).

The embodiment of the invention discloses a low-voltage reactive power compensation equipment state evaluation method, and the method comprises the steps: collecting basic data of low-voltage reactive power compensation equipment, the basic data comprises a voltage, a power factor, an active load, a distribution transformer low-voltage side reactive load, a distribution transformer low-voltage side active power, a reactive power, a common compensation capacitor rated capacity, a separate compensation capacitor rated capacity and a voltage abnormal duration; determining an evaluation index according to the basic data; and determining the operation state of the low-voltage reactive power compensation equipment according to the evaluation index. According to the method, the basic data is collected, the evaluation index is determined according to the basic data, the operation state of the low-voltage reactive power compensation equipment is further judged, the health condition and performance of the equipment can be comprehensively and objectively evaluated, the accuracy of state evaluation of the low-voltage reactive power compensation equipment can be improved, and the working efficiency is improved. And real-time monitoring and early warning of the operation state of the equipment can be realized.

The invention relates to the technical field of electric power system intelligent control, and discloses an intelligent control AC power grid reactive power coordination system and method, and the system comprises a data collection and communication module which is used for collecting the voltage, current, active load, reactive load and distributed energy power generation data of each node in a power grid, and uploading the data to a central control center through a communication network; and the deep reinforcement learning control center generates a reactive power scheduling strategy by using a deep reinforcement learning algorithm based on the power grid state data provided by the data acquisition and communication module. A dynamic reactive power scheduling strategy is generated by introducing a deep reinforcement learning algorithm and utilizing self-learning and self-adaptive capabilities of the deep reinforcement learning algorithm, so that intelligent decision making can be carried out according to real-time data, the limitation that a traditional method depends on a fixed rule is avoided, scheduling is more flexible and efficient, and the scheduling efficiency is improved. And the operation efficiency of the system under load fluctuation and distributed energy access is improved.

Light detection with reduced noise is disclosed. In one example, a comparator compares a signal with a reference signal and outputs a comparison result. The comparator includes a differential circuit that outputs a differential voltage between the signal and the reference signal, and an active load circuit electrically connected to the differential circuit, in which the active load circuit includes first and second transistors provided on a surface of a substrate, and the first and second transistors have channel regions extending in a direction substantially perpendicular to the surface of the substrate.

The invention provides a four-frequency-band reconfigurable load modulation balanced amplifier structure and a regulation and control method thereof, and aims to solve the problems that in the existing power amplifier technology, the efficiency is low during power back-off, and multi-scene requirements cannot be met. The four-frequency-band reconfigurable load modulation balanced amplifier comprises a 90-degree Lange coupler of an input port and a 90-degree Lange coupler of an output port; a two-stage reconfigurable balanced power amplifier composed of an input matching network, a reconfigurable inter-stage matching network and an output-stage pre-matching network and a two-stage control signal power amplifier are combined through an active load modulation technology and a reconfigurable technology, a compact matching network is utilized, and a reconfigurable power amplifier is formed. The efficiency of output power rollback is greatly improved, and the system requirements in different frequency band application scenes can be met.

The present disclosure provides a system for a wideband coupler balun with a load modulated power amplifier wherein the system can comprise a first port, a second port, a differential port, a differential main power amplifier, and an auxiliary power amplifier. The first port can be electrically connected to a first coupled line coupler. The second port can be electrically connected to a second coupled line coupler. The differential port can be electrically connected to the first and second coupled line coupler. The differential main amplifier can be configured to be electrically connected to the differential port. The auxiliary power amplifier can be configured to be electrically connected to the first port.

The invention belongs to the field of power distribution networks, and particularly relates to a power supply recovery method, device and equipment based on an energy storage type intelligent soft switch, and a storage medium, and the method comprises the steps: obtaining the load data of each node of a power distribution network and the power data between the nodes, and enabling the load data to comprise the active load demands and value coefficients of the corresponding nodes at the current moment; the electric data comprises a current value and a resistance value of a line between different nodes at the current moment; inputting the load data and the power data into a pre-established power supply recovery model, wherein a target function of the power supply recovery model is established by taking the minimum loss degree after the power distribution network fails as a target; and performing power transmission on the power distribution network according to output of the power supply recovery model. In the fault stage of the power distribution network, power transmission can be performed on the power distribution network through output of the power supply recovery model, efficient load transfer is realized, the recovery capability of the load of the power distribution network under the fault condition is improved, and important load power supply is guaranteed.

Systems and methods for direct-to-RF (radio frequency) software-defined radio implementation of an active load-pull system are provided. A system may include a controller, a primary field-programmable gate array (FPGA) to control and collect waveform data from vector signal analyzers (VSAs), each comprising an analog-to-digital converter (ADC) connected to an ADC signal-conditioning circuit to directly capture RF measurements of an input signal at an RF fundamental frequency of test and harmonics, each ADC signal-conditioning circuit altering a signal amplitude and isolating a wanted RF frequency of measurement at either the RF fundamental frequency of test or a harmonic to be received by its ADC, first and second couplers generating each input signal by extracting forward and reverse traveling waves at RF from input and output ports of a device under test (DUT), the VSAs capturing the input signals directly at the RF fundamental frequency of test or a harmonic.

The invention provides a millimeter wave digital power amplifier based on a serial transmission line balun synthesis network, and belongs to the technical field of millimeter wave digital power amplifiers. According to the millimeter wave digital power amplifier, firstly, a driving power distribution network based on a bridge and a transformer is adopted, and radio frequency power is subjected to differential conversion and then input into a digital power amplifier unit array; secondly, the digital power amplifier unit adopts a differential Cascode structure with a neutralizing capacitor, so that the gain and the output impedance of the digital power amplifier unit can be effectively improved; finally, a synthesis network based on a series transmission line balun is adopted, the synthesis network can realize active load modulation optimization of the digital power amplifier, the impedance matching condition of the digital power amplifier under the maximum and partial rollback output power levels is improved and balanced, and the overall efficiency is improved.

The invention relates to the technical field of industrial equipment control, and discloses a dynamic maintenance management method and system based on the full life cycle of test equipment, and the method comprises the steps: obtaining a time domain vibration signal and torque current data during the operation of the equipment through a high-frequency vibration sensor and a current loop feedback interface; calculating an accumulated damage gradient parameter representing the physical recession degree of the mechanical transmission chain; the parameters are input into a preset damage stress coupling model to solve the maximum radial impact force allowed to be borne by the damaged part, and the impact force is mapped into a dynamic capability boundary for carrying out logic constraint on the motion planning instruction; and the motion controller reconstructs an ideal speed curve by using the boundary in an interpolation period, and reshapes a torque load spectrum output to a servo motor by reducing the jump of acceleration and deceleration sections. The problem that an existing static control strategy is mismatched with the dynamic aging characteristic of equipment is solved.

A calibration and impedance synthesis (tuning) method for active load pull systems employs prior calibration and dynamic interpolation routines. Since active load pull systems differ from passive load pull systems in that the device under test (DUT) is part of the tuner, in large signal the tuner cannot be calibrated independently. The new active load pull system comprises an impedance generation algorithm based on prior calibration and dynamic in memory interpolation routines. At small signal levels the procedure is like with passive load pull tuners. At higher power, where the DUT becomes nonlinear, the calibration yields only approximate data. For load pull contour generation this is still adequate.

The invention relates to the technical field of radio frequency microwave measurement, in particular to a tested piece harmonic test link and an active load traction system and method.The system comprises a control module and a test link. Determining a test signal value of the vector signal source in the test link and a phase adjustable signal value of the first adjustable phase vector signal source according to the target mismatch degree; then, a plurality of impedance points on the Smith chart are simulated by adjusting the amplitude and the phase of the first adjustable phase vector signal source, the vector signal source is controlled to send out a test signal value, and the first adjustable phase vector signal source is controlled to send out a phase adjustable signal value, so that a tested piece is tested; and finally, obtaining a harmonic value corresponding to each impedance point, and obtaining the maximum harmonic of the tested piece under the target mismatch degree according to the harmonic value corresponding to each impedance point. According to the invention, the impedance adjusting range and precision are higher, and the adjusting speed is higher.

A charge pump includes a DAC (digital-to-analog converter) configured to draw a first current and a second current from a first node and a second node, respectively, in accordance with a first logical signal, a second logical, and a B-bit control word; a common-gate amplifier configured to provide a path for charge transfer between the second node and a third node in accordance with a third logical signal; an integrating capacitor connected to the second node and configured to be either discharged by the DAC or charged by the common-gate amplifier in accordance with a fourth logical signal; and a low-impedance active load connected to the first node.

The invention provides an active load prediction method and device for a low-voltage distribution transformer area, relates to the field of transformer area load prediction, and solves the technical problem that a prediction error can be sharply increased in a non-linear response facing an air temperature abrupt change influence. The method comprises the following steps: collecting and cleaning multi-source data of a transformer area to obtain electrical measurement data; obtaining weather forecast data of a transformer area location, and performing tensor conversion to obtain a three-dimensional tensor; and obtaining an electric regulation and control policy, performing time sequence alignment on the effective time of the electric regulation and control policy and the three-dimensional tensor to form a bimodal input matrix, inputting the bimodal input matrix and the electric measurement data into the multi-factor coupling probability prediction model, and outputting a load prediction value. The method is used in the active load prediction process of the low-voltage distribution transformer area. According to the method, meteorological parameters, policy texts and other unstructured data are converted into quantifiable features, and high-precision load prediction within 48 hours, 72 hours and other time periods is realized through a multi-factor coupling prediction model.

According to the control method of the air conditioning system, the controller and the air conditioning system, under the condition of low load demand, the air conditioning system avoids an extreme strategy of complete shutdown or high-load operation in a traditional method through judgment of active load demand data, total environment temperature data and historical target temperature data are further obtained, and the control method of the air conditioning system is provided. And calculating a passive load demand, and executing a first control strategy of low-power-consumption mode operation, so that the temperature of the room or the region corresponding to the sub-controller gradually approaches the historical target temperature. According to the method, energy consumption and equipment abrasion are reduced, and meanwhile, the response efficiency and the user experience of the air conditioning system in the low-load period are remarkably improved by optimizing the water temperature and the system operation state.

Solid-state imaging devices and electronic devices with reduced noise are disclosed. In one example, a solid-state imaging device includes a first substrate including a photodiode and a transfer transistor, and a second substrate including an active load circuit and a differential pair circuit for a comparator, in which the active load circuit includes a first transistor, the differential pair circuit includes a second transistor, and transconductance of the first transistor is smaller than transconductance of the second transistor.

The invention provides a reconfigurable power amplifier based on dynamic modulation of a gate width adjustable transistor, and belongs to the technical field of radio frequency power amplifiers. The power amplifier is characterized in that a multi-mode grid width adjustable transistor is innovatively introduced to replace a traditional solidified structure parameter transistor to serve as a power amplifier tube; the transistor with the adjustable gate width is divided into a main unit cell and n auxiliary unit cells according to an interpolation index (or gate width), the main unit cell is responsible for determining the output power of the whole transistor, meanwhile, n small-power auxiliary unit cells are integrated to form an active load modulation module, and impedance matching optimization and linearity compensation are achieved by dynamically adjusting the on-off state of the active load modulation module. According to the structure, the linear expansibility of power output is guaranteed, a hardware basis is provided for micro impedance adjustment, cooperative regulation and control of system power efficiency dual modes and even linearity are achieved, and the power amplifier performance in a multi-band wireless communication system is effectively improved.

The present application belongs to the technical field of filter, and relates to a micro-coaxial millimeter wave filter with source-load coupling, comprising a metal shell; a first transmission line resonator, a second transmission line resonator, a third transmission line resonator, a fourth transmission line resonator, a fifth transmission line resonator and a sixth transmission line resonator are arranged in the metal shell, there is magnetic coupling between adjacent transmission line resonators, and there is electric coupling between the second transmission line resonator and the fifth transmission line resonator; an input feed structure is arranged on one side of the first transmission line resonator, and an output feed structure is arranged on one side of the sixth transmission line resonator; a source-load coupling structure is arranged between the input feed structure and the output feed structure; a first adapter structure is connected with the input feed structure, and a second adapter structure is connected with the output feed structure. The present application simultaneously realizes small size and good frequency band selectivity, and can adapt to the harsh requirements of high-performance millimeter wave systems.

The invention relates to the technical field of amplifiers, in particular to a variable gain amplifier with a wide linear gain range and a working method, and the variable gain amplifier comprises the steps that a linear gain generation circuit receives a differential input signal and provides gain-adjustable differential output based on linear control voltage; the linear gain generation circuit comprises at least one stage of variable gain unit which comprises differential input pair transistors MN1 and MN2. The load resistor elements R1 and R2 are connected between the power supply voltage VDD and the drain electrodes of the differential input pair transistors MN1 and MN2; the tail current source MN3 provides bias current for the differential input pair transistors MN1 and MN2; the active load network is connected between the drain electrodes of the differential input pair transistors MN1 and MN2 and the ground; the active load network comprises a control tube MN8, the control tube MN8 works in a sub-threshold region, a grid electrode receives linear control voltage, equivalent impedance of the active load network is enabled to be in exponential change along with the linear control voltage through exponential I-V characteristics, and dB linear gain adjustment of the variable gain unit is achieved.

A measurement system for active load traction testing and an active load traction measurement method are described. The measurement system comprises a signal analysis module, a signal generator module, a control module and a DUT connector. The DUT connector may be connected to a device under test to receive an output signal of the device under test. The signal analysis module is connected to the DUT connector such that the signal analysis module receives a measurement signal corresponding to the output signal. The signal generator module is configured to generate a radio frequency (RF) test signal. The signal generator module is connected to the DUT connector such that the RF test signal is applied to the device under test. The signal analysis module is configured to digitize the measurement signal to obtain a digitized measurement signal. The control module is configured to control the signal generator module to generate the RF test signal based on the digitized measurement signal, based on known error parameters of an error model of the measurement system, and based on a desired reflection coefficient at a reference plane associated with the device under test.

The embodiment of the invention provides an active load modulation radio frequency power amplification circuit, a chip and communication equipment, and a first amplifier is used for receiving and amplifying a radio frequency signal. The bisection power distribution circuit is used for dividing the amplified radio frequency signal into a first signal and a second signal with the same power. The second circuit is used for outputting control signals. The coupler is used for receiving a first signal through the first input end, receiving a second signal through the second input end, receiving a control signal through the isolation end and outputting a radio frequency signal through the output end. According to the scheme, the bisection power distribution circuit is used for replacing an amplifier and a coupler in an existing power amplification circuit, the amplitude and the phase of signals entering the coupler can be better kept consistent, and the influence on the performance of the active load modulation radio frequency power amplification circuit caused by the individual difference of the amplifiers is reduced; and the consistency of batch production is improved, so that the production efficiency is improved.

[Problem] To provide a comparator, a light detection element, and an electronic device that reduce noise. [Solution] A comparator for comparing a signal with a reference signal to output a comparison result, and comprising a differential circuit for outputting a differential voltage between the signal and the reference signal, and an active load circuit electrically connected to the differential circuit. The differential circuit includes a first transistor and a second transistor disposed on a surface of a substrate. The first transistor and the second transistor have channel regions extending in a direction substantially perpendicular to the surface of the substrate.

The invention relates to a transmission and reception device with a broadband HF power amplifier, in particular an N-way Doherty amplifier with active load modulation. The object of the invention is to provide a high-power transmission and reception device suitable for high-power and broadband applications and having a transmission power of more than 10 Watts to approximately 2000 Watts by means of appropriate design measures in combination with electronic components, starting from a transmission and reception device with a module (GSZ) having a configurable HF high-power amplifier (HPA) that operates between and below two power back-off points and comprises a main power amplifier (DM) with an amplifier core and at least one peak power amplifier (DP1) with an amplifier core, wherein a digital input signal distributor (ET) is provided, which is connected to the input of the main power amplifier (DM) and to the input of the at least one peak power amplifier (DP1) and has a plurality of outputs, and an output combiner connected to the output of the amplifier core of the main power amplifier and the output of the at least one peak power amplifier is provided. This object is achieved according to the invention, in which an additional multiharmonic transformation line (LAH) is provided at the amplifier core output of a main power amplifier (DM) and at the amplifier core output of at least one peak power amplifier (DP1) and a circulator (Z1) connected to the output of an impedance converter (AN1) or an output combiner (C). By means of the circulator (Z1), the upstream main power amplifier (DM) and at least one peak power amplifier (DP1) are protected from overvoltage and overcurrent on the output side, because the circulator (Z1) transfers energy to a collecting resistor (W1) connected to the circulator (Z1). The invention belongs to the field of broadband amplifiers, in particular broadband Doherty amplifier circuits.

This invention provides an optimized system for improving the slew rate of a Line Driver, comprising a differential input module, a bias current module, an amplification module, an active load module, and a mirror load module. The differential input module receives the input signal and converts the voltage signal into a current signal. The bias current module provides a stable bias current to the circuit. The amplification module receives the current signal from the differential input module and achieves voltage gain. The amplification module is electrically connected to the active load module. The active load module can improve the amplification gain of the amplification module, replicate the current, and stabilize the output node. The mirror load module can replicate the signal amplification path of the amplification module to achieve symmetrical output, thereby improving the signal amplification effect and anti-interference reliability of the circuit and solving the problem of limited slew rate in traditional optimized systems for Line Drivers.

The application discloses a base station load balancing method and device, a storage medium and an electronic device, and relates to the technical field of communication. The method comprises the following steps: predicting the distribution characteristics of network service demand of a target scene in a target time period based on historical service data; adjusting the resource distribution of the base station according to the distribution characteristics; receiving a target service combination in the target time period, wherein the target service combination comprises M services and the priority of each service, and M is an integer greater than or equal to 1; based on the resource distribution of the base station, adjusting the target model according to the target service combination and a target algorithm, and generating a load balancing strategy for the target service combination based on the adjusted target model. The application solves the technical problem that the traditional load balancing algorithm is inefficient and cannot realize active load management when the base station load balancing scheme in the prior art faces rapid changes and burst conditions.

The present invention provides a flexible interconnection planning method for substations based on distribution transformer sensitivity analysis. The present invention uses a mathematical model of the substation distribution transformer to calculate the load rate sensitivity of the distribution transformer. Secondly, the substations to be interconnected are screened according to the sensitivity of the distribution transformers in each substation, and the connection mode of the flexible interconnection device (FID) is optimized based on the goal of substation load balancing. Then, an FID sizing and system maximum power supply capacity optimization model is established. With the optimization of the maximum power supply capacity (TSC) as the objective function, the configuration capacity of the FID and the active load distribution of the substation are determined, and redundant capacity is removed by secondary optimization of the FID construction cost. Finally, a case study of 40 substations is used to verify that the proposed method can take into account the goals of improving power supply capacity and balancing distribution transformer load, and a scenario comparison is set up to verify the superiority of the proposed method in enhancing power supply capacity, improving load distribution, and improving economic benefits.

The application discloses a signal demodulation circuit and a digital isolation circuit, wherein the signal demodulation circuit is arranged at a receiving end of the digital isolation circuit and comprises a common-gate amplification module, a demodulation module and a common-gate amplification module; the common-gate amplification module is used for receiving full-differential signals output by an isolation module in the digital isolation circuit and amplifying the full-differential signals; the demodulation module is connected with the common-gate amplification module and is used for demodulating the amplified full-differential signals and outputting the demodulated full-differential signals; and the common-gate amplification module comprises a first active load, a second active load, a first NMOS tube, a second NMOS tube, a first coupling capacitor, a second coupling capacitor, a first sampling resistor and a second sampling resistor. The circuit has high anti-interference capability.

The invention relates to the technical field of power supply systems, in particular to a micro-grid power supply control method and system based on load monitoring, and the method comprises the steps: obtaining the load data and voltage data of each power utilization node in a micro-grid; dividing the micro-grid into a plurality of power utilization areas; determining a likelihood index that load reduction belongs to active load reduction; and determining the power supply index of each power utilization node based on the historical synchronous load data, and adjusting the power supply priority in combination with the possibility index to perform local power supply regulation and control of the micro-grid. According to the method, the load in the micro-grid is monitored in real time, dynamic partitioning is implemented based on the load association between the power utilization nodes, and the power supply priority is adjusted in combination with the distinguishing result of active and passive load reduction and the historical load fluctuation characteristics, so that accurate local power supply regulation and control considering the electrical association and the time sequence characteristics is realized; and the reliability and the electric energy quality of micro-grid power supply are improved.

The invention discloses an electromechanical transient simulation method and system for the voltage stability of a power system, and the method comprises the steps: obtaining data after the system is disturbed, and obtaining a time constant when a load is disturbed to recover to a steady state, and a proportion coefficient related to a static active load and a reactive load through a parameter identification algorithm; listing a conventional ZIP static load model, constructing a dynamic ZIP load model by adopting a proportional integral differential link and an amplitude limiting link, and reflecting an input-output relationship between active and reactive loads and equivalent impedance; determining a system balance point according to a steady-state power flow calculation result, performing linearization processing on all dynamic equations of the whole network at the balance point to obtain a state space model, calculating a state matrix eigenvalue, and judging a voltage stability condition of a bus where a load is located according to a sign of a real part of a related eigenvalue; and performing dynamic time domain simulation on the adjusted system, applying N-1 or N-2 type line faults to the whole network, and simulating a possible voltage collapse scene of the system. And a theoretical support is provided for providing countermeasures after voltage instability.