119 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).

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 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.

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.

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 a W-band high-backoff-efficiency power amplifier adopting a power synthesis technology, and relates to the technical field of millimeter wave integrated circuits, and the power amplifier comprises a power distribution network, a differential driving stage, an inter-stage matching network, a differential output stage, an active load modulation network and a self-adaptive bias network. A radio frequency input signal is divided into two paths of signals which are equal in amplitude and have a phase difference of 90 degrees through the power distribution network, and after the two paths of signals are subjected to differential amplification through the main path and the auxiliary path respectively, in-phase power synthesis output is completed through the active load modulation network. A self-adaptive bias network is introduced for an auxiliary circuit amplifier, a radio frequency input signal is accessed to the input end of the self-adaptive bias network, and auxiliary circuit bias is dynamically adjusted according to the size of input power: an auxiliary circuit is closed or slightly opened when the signal is small, and is completely opened when the signal is large, so that high linearity and high power additional efficiency are simultaneously realized in a wide power range. The power amplifier disclosed by the invention still keeps high efficiency in a backoff region, and is suitable for 5.5 G / 6G communication, radar and imaging systems.

In one embodiment, an object can communicate contactlessly with a reader using active load modulation. The method includes detecting a sensing magnetic field emitted by the reader, initializing a phase-locked loop of the object, detecting a stopping of the sensing magnetic field emitted by the reader before initializing the phase-locked loop of the object is complete, calibrating an oscillator of the phase-locked loop on the basis of an internal clock of the object, detecting a new sensing magnetic field of the reader after calibrating the oscillator, and implementing the phase-locked loop to adjust the phase of the oscillator after detecting a new sensing magnetic field.

The present invention relates to a method for predicting the load level of a branch line distribution transformer based on user-side smart meter data. The method calculates branch reactive power and line loss through the power flow relationship of the distribution network, and designs an algorithm for estimating reactive load based on the smart meter data. The distribution characteristics of the three-phase source and load of the distribution network are judged according to the data collected by the meter, and then the branch power flow is iteratively calculated at a fixed point in combination with the new energy output data and the network topology. When the voltage difference obtained by the iteration is within a preset range, accurate three-phase reactive load data is obtained. For a distribution network with asymmetrical distribution of three-phase source and load, the method further considers the line charging effect and combines the reactive load prediction data and active load collection data of the distribution network to evaluate the load level of the branch line distribution transformer. The method solves the problem that the load level of the branch line distribution transformer is difficult to accurately evaluate due to the inability to directly measure the reactive load on the user side of the distribution network, thereby significantly improving the automation level of the distribution network and the safe and stable operation of the distribution network.

The application relates to a silicon-based millimeter wave broadband compact double-drive high-efficiency Doherty power amplifier, belonging to the technical field of radio frequency integrated circuits, comprising an input quadrature coupler, a main and auxiliary two power amplifier paths and a broadband load modulation output network; wherein the power amplifier path adopts a differential common source and common gate unit with cross-coupling capacitance and a double-mode drive topology to improve the gain and efficiency of the millimeter wave frequency band; the output network adopts a slow wave transmission line structure combined with a cascade coupling line pair to realize broadband active load modulation and absorb transistor parasitic capacitance, and simultaneously optimize the chip area. Thus, the problem that the efficiency and bandwidth are difficult to be considered simultaneously due to the limited load modulation bandwidth and the decreased transistor gain of the traditional silicon-based millimeter wave Doherty power amplifier is solved.

A near field communication (NFC) device includes a phase detector for receiving a reference clock signal, detecting a phase of the reference clock signal, outputting a generated clock signal having a frequency synchronized with the reference clock signal, and storing phase information of the generated clock signal as a first digital code. A phase delay calculator compares the phase of the generated clock signal applied from the phase detector and a reference phase to calculate a delta value while performing an active load modulation (ALM) operation and stores the delta value as a second digital code. A transmission clock signal generator reflects phase information stored as the first digital code and the second digital code to output a transmission clock signal. Accordingly, the NFC device controls the phase of the transmission clock signal applied to the antenna of the reader device to have optimal load modulation amplitude (LMA).

The present invention discloses a method and system for simulating the electromechanical transient state of power system voltage stability. The method obtains data after the system is disturbed and uses a parameter identification algorithm to obtain the time constant for the load to recover to a steady state, as well as the proportional coefficients related to the static active load and reactive load. A conventional ZIP static load model is listed, and a dynamic ZIP load model is constructed using a proportional-integral-differential (PID) and a limiting step to reflect the input-output relationship between active and reactive loads and equivalent impedances. The system equilibrium point is determined based on the results of steady-state power flow calculations, and all dynamic equations of the entire network are linearized at the equilibrium point to obtain a state-space model. The eigenvalues ​​of the state matrix are calculated, and the voltage stability of the busbar where the load is located is determined based on the positive and negative signs of the real parts of the relevant eigenvalues. A dynamic time-domain simulation is performed on the adjusted system, and an N-1 or N-2 line fault is imposed on the entire network to simulate the voltage collapse scenario that may occur in the system. This provides theoretical support for proposing countermeasures after voltage instability.

This invention relates to the field of wind power control technology, and proposes a method, system, equipment, and medium for active yaw load reduction control of wind turbine generators. Before the wind turbine generator executes a yaw action, the required yaw torque is calculated, and a load reduction threshold determined by the maximum yaw torque of a benchmark turbine under the same operating conditions is used to determine whether the current yaw torque is within the load reduction range. If it is within the load reduction range, a corresponding load reduction power target value is matched according to the percentage of yaw torque, and the actual power of the wind turbine generator is smoothly adjusted to the load reduction power target value according to a preset power change rate and a set conversion time. This allows the generator to reduce other operating power or non-yaw workloads before the yaw action is executed, reserving sufficient power and drive margins for the yaw system. This ensures that the yaw reducer can still obtain the output capacity required for yaw action when facing large yaw torque demands, avoiding insufficient yaw execution capability due to excessive occupancy of other working power.

The application provides a substation reactive power control limit value adjustment method and device, through a first reactive power limit value interval, a second reactive power limit value interval, a control switching threshold value and a preset condition, a target reactive power control limit value interval of the current substation reactive power control is determined, that is, the automatic switching of the reactive power limit value interval based on the control mode switching threshold value, the dynamic setting of the reactive power control limit value is realized. When the active load of the substation is low, the reactive power limit value calculation is too small, which leads to the problem of reactive power control lockout, according to the different load operation states of the substation, the dynamic setting of the reactive power limit value is carried out, a more reasonable reactive power limit value interval is given, and the problem of reactive power control lockout caused by unreasonable limit value is avoided, the application can improve the operation control effect of the substation, has engineering practicability, and has a remarkable effect on supporting the economic operation of the power grid.

A method for detecting a load connection status of an energy storage power supply including an inverter power supply, comprising the steps of: (S1) sampling an output voltage and an output current of the inverter power supply and calculating an output visible power; and (S2) determining whether the visible power is less than a predetermined power threshold, and if the visible power is greater than the predetermined power threshold, detecting that a load is connected to the energy storage power supply; and (S3) executing an active load online detection algorithm to perform secondary detection if the visible power is less than the predetermined power threshold, and determining whether a load is connected based on the result of the secondary detection. This method can automatically recognize the load connection status, and can reduce erroneous determination of the load connection status when the connected load is a small-power load, thereby improving the accuracy of detecting the load connection status of the energy storage power supply, thereby avoiding the inconvenience of turning off the output of the inverter power supply and disconnecting the load due to erroneous determination.

1. Name of the product in this design: Graphical User Interface for Circuit On / Off Configuration and Data Display of Electronic Equipment. 2. Purpose of this design: An electronic device. 3. The key design features of this product are: the content of the graphical user interface in the electronic device. 4. The picture or photo that best illustrates the key design points: Design 1 front view. 5. As is customary, the top view, bottom view, left view, right view, and rear view of each design are omitted. 6. Design 1 is designated as the basic design. 7. Purpose of the graphical user interface: To configure the opening and closing combinations of single-control and multi-control switches in the circuit, display the circuit path in red highlight, and display and configure data in the dialog box window; for modified data, an asterisk (*) is added to the data label on the main interface. 8. Human-computer interaction method of graphical user interface: The main view of Design 1 displays the initial graphical user interface. Clicking the "Pin5" item in the tree control on the left side of the interface will enter the change state diagram 1 of Design 1. The circuit diagram is displayed on the right side of the interface. Clicking the single-control switch legend to the right of the "Active Load" text in the circuit diagram indicates that the switch is closed and enters the change state diagram 2 of Design 1. Design 2 main view displays the initial graphical user interface. Click the "Pin5" item in the tree control on the left side of the interface to enter Design 2 change state diagram 1; click the multi-control switch legend above the "Active Load" text in the circuit diagram to indicate the switch switching contact here, and enter Design 2 change state diagram 2. Design 3 main view displays the initial graphical user interface. Click the "Pin5" item in the tree control on the left side of the interface to enter Design 3 change state diagram 1; click the input box to the right of the "Vih" text in the circuit diagram to pop up the parameter setting dialog box and enter Design 3 change state diagram 2; modify all the input box data in the dialog box to "2V", click the "OK" button to close the dialog box and enter Design 3 change state diagram 3. The corresponding data in the circuit diagram has been modified. Design 4's main view displays the initial graphical user interface. Clicking the "Pin5" item in the tree control on the left side of the interface leads to Design 4's change state diagram 1. Clicking the input box to the right of the "Ioh" text in the circuit diagram brings up a parameter setting dialog box, leading to Design 4's change state diagram 2. Modifying the data in the Ioh input box to "23mA" and the data in the Iol input box to "15mA" in the dialog box, and clicking the "OK" button to close the dialog box, leads to Design 4's change state diagram 3, where the corresponding data in the circuit diagram has been modified. Design 5's main view displays the initial graphical user interface. Clicking the "Pin5" entry in the tree control on the left side of the interface leads to Design 5's change state diagram 1. Clicking the input box to the right of the "Voh" text in the circuit diagram brings up a parameter setting dialog box, leading to Design 5's change state diagram 2. Modifying the data in the Voh input box to "30uV" and the data in the Vol input box to "25uV" in the dialog box, and clicking the "OK" button to close the dialog box, leads to Design 5's change state diagram 3, where the corresponding data in the circuit diagram has been modified.

The application designs a constant power mode electric vehicle power interconnection device and a control method thereof, the device comprises: a battery unit, a Boost step-up conversion unit, a double active bridge step-up converter (DAB), a voltage / current sensor, an A / D module, an IGBT driving module, a UDE-based robust voltage controller; considering that the electric vehicle fast charging standard is a constant power active load, and the circuit tracking error caused by external interference and the uncertainty of the system and the load characteristics, the UDE-based robust control is modeled by using the constant power load, the stable boundary is given, and a UDE-based robust voltage controller is adopted for the load electric vehicle with different circuit parameters, so as to improve the robustness of the system and realize high-precision tracking. The charging demand of different types of electric vehicles is met, and a technical basis is provided for the electric energy interconnection of electric vehicles.

A transconductance amplifier that generates an output voltage by amplifying a difference between an input voltage and a reference voltage, includes: a differential amplifier circuit including an input differential pair configured to receive the input voltage and the reference voltage and operate according to a tail current, and an output circuit provided as an active load of the input differential pair to generate the output voltage; and a current control circuit configured to control the tail current, wherein the current control circuit is configured to increase the tail current when a current supply condition is satisfied, and the current supply condition is that the input voltage falls below a first threshold voltage which is equal to or lower than the reference voltage, or that the input voltage exceeds a second threshold voltage which is equal to or higher than the reference voltage.

The application relates to an active load response system based on low communication demand, wherein a central control module and a plurality of frequency modulation modules are connected through distributed control communication; the frequency modulation module comprises a data receiving and transmitting unit, a data processing and storage unit and an active load response adjusting unit; the data receiving and transmitting unit is used for obtaining operation data of the central control module, other frequency modulation modules and power loads; the data processing and storage unit is used for determining consumed power of the active load response adjusting unit according to the operation data obtained by the data receiving and transmitting unit and the operation state of the active load response adjusting unit; and the active load response adjusting unit is used for adjusting consumed electric energy of the load through a communication mode or a direct adjustment mode of load power voltage and frequency. The application solves the technical problems of a large number of devices, small capacity and wide distribution in the prior art, improves the technical performance of device clusters, and provides frequency support and adjustment for a power system.

The utility model discloses a bipolar constant-voltage current-limiting, constant-current voltage-limiting control circuit, which comprises a first setting terminal, a second setting terminal and a third setting terminal, the first setting terminal is connected in series with a first operational amplifier unit through a resistor R1, the second setting terminal is connected in series with a second operational amplifier unit through a resistor R3, and the third setting terminal is connected in series with a second operational amplifier unit through a resistor R3. And the third setting terminal is connected in series with the third operational amplifier unit through a resistor R5. The bipolar constant-voltage current-limiting and constant-current voltage-limiting control circuit has the function of limiting the magnitude of output or well-in current in a constant-voltage mode and also has the function of limiting the upper and lower limits of open-circuit voltage in a constant-current mode, the well-in current function of the bipolar constant-voltage current-limiting and constant-current voltage-limiting control circuit can enable the bipolar constant-voltage current-limiting and constant-current voltage-limiting control circuit to serve as an active load to be used for measuring the loading capacity of a power supply type chip, the application is wide, and the reliability is high. The practicability is high.