147 results about "Load line" patented technology

The invention discloses a power adapter parameter dynamic optimization method for prolonging the service life of equipment, and relates to the technical field of adapter performance optimization, and the method comprises the steps: monitoring and recording the output voltage, current and power factor parameter changes of a power adapter in real time under static and dynamic load conditions by using a test instrument; identifying the trend and reason of abnormal parameter change; performing thermal design optimization and temperature management on the power adapter; performing over-power and over-current limitation on the pulses one by one; introducing a power factor correction circuit; optimizing the switching frequency and the design of an output filter; a load line adjusting circuit is introduced, and space is reserved for dynamic ripples when output current jumps; and evaluating whether the optimization effect reaches an expected target or not. By introducing the power factor correction circuit and the load line adjustment circuit, the power factor of the power adapter is improved, the harmonic pollution is reduced, the stability of the output voltage of the power adapter is improved, and the performance of the power adapter under the dynamic load condition is improved.

Systems and methods for monitoring the isolation resistance of one or more fuel cells are described herein. In one example, a system includes a current transformer having a hollow core. First and second portions of a load line from a fuel cell are located within the hollow core. The first portion of the load line is electrically between an anode of a fuel cell and an electrical load, while the second portion of the load line being electrically between a cathode of the fuel cell and the electrical load. The current transformer is configured to output an electrical signal proportional to a current passing through the hollow core. This electrical signal can then be used to determine the isolation resistance of the fuel cell.

A DC-DC power converter with closed loop error compensation may operate in both pulse width modulation (PWM) mode and pulse frequency modulation (PFM) mode. The DC-DC power converter includes type III compensation, and is operable in PWM mode and PFM mode. Use of a bypass switch for an output inductor of the power converter may increase stability of a loop including type III compensation.

The invention relates to the field of load control, in particular to a non-fixed load accurate removal method based on load control fairness and effectiveness consideration. Comprising the following steps: acquiring the frequency of a power grid system, calculating the frequency change rate, judging whether to send a'preparation for load shedding 'instruction to all substations by monitoring the frequency of the power grid system and the frequency change rate, entering a load shedding amount calculation stage, and calculating the load amount needing to be cut off in each region through a dynamic weighted load precise cutting algorithm, calculating a total load shedding amount; based on the load capacity needing to be cut off in each area, the substation optimizes the cut-off combination of the load lines in the areas, after optimization is completed, the substation executes cut-off, and the master station monitors the frequency and the frequency change rate of the power grid system after cut-off and judges whether a locking condition is met or not so as to stop further cut-off. The technical problems that power grid frequency monitoring mostly depends on low-sampling-rate equipment, the rapidly-changing frequency dynamic state is difficult to capture, and instability detection lags or misjudgments are caused are solved.

The utility model discloses a circuit protection device, which comprises a shell consisting of a base and an upper cover, and further comprises a partition plate, a circuit board, an alternating current power supply channel, a synchronous conversion unit, a reset operation mechanism, a tripping operation mechanism, a ground fault detection driving unit and a test and reset switch, and the functions of grounding fault protection and synchronous connection of alternating current power supply channels are realized. The circuit protection device has a manual mechanical tripping function, and ensures that an alternating current power supply leading to a load line can be forcibly cut off manually when the circuit protection device has a circuit fault or the load line has a fault; the circuit protection device has the function of a synchronous conversion unit, realizes synchronous power supply of the load terminal and the socket terminal, improves the current bearing capacity and reliability of the circuit protection device, and ensures that power cannot be taken from the socket terminal in the installation process when an alternating current power supply is reversely connected to the load terminal so as to prompt that the circuit protection device is installed mistakenly.

The invention provides a power flow convergence method and system based on direct current power flow preprocessing and staged decoupling, and belongs to the field of power system analysis and control. Comprising the following steps: performing multi-stage verification and parameter adjustment on original power flow data, executing active balance preliminary verification of a power system, and generating a node active power set initial value set; setting an initial value set based on the active power of the nodes to carry out direct-current power flow calculation, obtaining an initial phase angle of each node, identifying a heavy-load line with a power angle difference exceeding a preset threshold value, and carrying out adjustment to obtain initial phase angle distribution; in combination with a preset initial voltage amplitude and the initial phase angle distribution, performing staging decoupling load flow calculation and adjustment to obtain load flow parameters; and taking the power flow parameter as an initial value, and carrying out full-coupling power flow calculation to obtain a final power flow solution meeting the convergence precision requirement. According to the method, the physical root of the convergence problem can be intelligently diagnosed and positioned, and the convergence and robustness of load flow calculation under complex working conditions are effectively improved through small-range targeted adjustment.

A load line impedance modulation circuit includes a magnetic circuit, an adjustable capacitance coupled to an output of the magnetic circuit, and a plurality of adjustable resistances coupled to the output of the magnetic circuit, wherein the plurality of adjustable resistances are configured to select from available output ports, an impedance presented by the load line impedance modulation circuit being adjustable dependent on at least a number of selected output ports.

A semiconductor integrated circuit device capable of inputting a signal of a MEMS transducer 2 includes: a power supply circuit 11 for the MEMS transducer 2; an input amplifier 12 for inputting and amplifying a signal of the MEMS transducer 2; a line driver 13 for amplifying an output from the input amplifier 12 and allowing for driving of a load connected to an output terminal T3, the line driver 13 having an input terminal; and the output terminal T3 for outputting an output of the line driver 13, wherein the power supply circuit 11, the input amplifier 12, and the line driver 13 are integrally formed on a semiconductor substrate, and wherein a gain setting circuit 14 for determining gain of the line driver 13 and a DC potential of the output terminal T3 is connected to the input terminal of the line driver 13.

Provided in the present disclosure are a phase shifter, an antenna, and a communication device. The phase shifter comprises: a first substrate; a tunable reactance structure, which is located on one side of the first substrate, wherein the tunable reactance structure comprises: a first grounding layer located on one side of the first substrate, an tunable dielectric layer located on the side of the first grounding layer away from the first substrate, and a load line layer located on the side of the tunable dielectric layer away from the first substrate; a second substrate, which is located on the side of the tunable reactance structure away from the first substrate; a second grounding layer, which is located on the side of the second substrate away from the first substrate; a third substrate, which is located on the side of the second grounding layer away from the first substrate; and a 3 dB coupler, which is located on the side of the third substrate away from the first substrate, wherein the 3 dB coupler comprises an input port, an output port, a first coupling port and a second coupling port, the input port and the output port being located on the same side, the first coupling port and the second coupling port being located on the other opposite side, and the first coupling port and the second coupling port both being electrically connected to the load line layer.

The invention provides a circuit design-process collaborative optimization method, a preparation method and a circuit based on an edge contact two-dimensional transistor, and aims at remarkably improving the load linearity, the output resistance and the switching stability of the two-dimensional transistor by adopting an edge contact process and optimizing the geometric parameters of the transistor according to the performance requirements of an analog circuit. The method specifically comprises the optimization design of the edge contact transistor, the characterization and improvement method of the load performance, and the system integration and application of the edge contact transistor in a high-performance analog circuit module. The invention provides a complete solution from transistor-level process optimization to circuit-level performance improvement, and provides a key technical path for design and manufacturing of high-linearity and high-stability analog and mixed signal integrated circuits based on novel two-dimensional semiconductors.

Certain aspects of the present disclosure generally relate to power supply circuits and techniques for load voltage drop compensation. An example power supply circuit generally includes: a power stage coupled between the power stage and an output node of the power supply circuit; a feedback circuit coupled to the output node of the power supply circuit and including a feedback node; a level-shifter circuit including an input coupled to the feedback node; and a first current source coupled between the level-shifter circuit and a node of the feedback circuit.

The invention discloses a server board burning prevention system and a working method. The server board burning prevention system comprises a power source, a power supply circuit, a load circuit, a first sampling unit, a second sampling unit, a comparison unit and a control unit. The power supply, the power supply circuit and the load circuit are connected in sequence; one end of the first sampling unit is arranged on the power supply line and the other end is connected to the comparison unit; one end of the second sampling unit is arranged on the load line, and the other end is connected to the comparison unit; the control unit is connected to the comparison unit and the power supply. The first sampling unit and the second sampling unit are used for sampling the power supply line and the load line respectively, the comparison unit is used for comparing and analyzing the sampling result, whether the current is abnormal or not can be accurately judged in real time, and compared with a traditional single threshold value overcurrent protection mode, the device has higher accuracy and reliability, and the reliability of the device is improved. And a power supply can be quickly cut off, so that the server is effectively prevented from being burnt due to abnormal current, and stable operation of the server is guaranteed.

A stability evaluation method based on a common-bus DC interconnection system belongs to the technical field of DC interconnection system stability determination, and comprises the following steps: step 1, constructing an input impedance model and a transmission line impedance model of a voltage and current double-loop constant power regulation module; step 2, establishing a common bus direct current network impedance comprehensive model containing a load line; and 3, analyzing the mutual relation between the output impedance ZLRC (s) of the multi-machine DC voltage regulation module and the load input total impedance ZPOL (s) to judge the stable state of the system. The method is suitable for the direct current interconnection system, and can effectively prevent the stability problem possibly caused by the constant power module during the bus integration of the direct current system.

A system for electrically connecting first and second load wires and first and second source wires. The system includes a lock body defining a receptacle inside the lock body. The system also includes first and second contact elements for electrically connecting the load wires and the source wires. The load wires are connectable to the first and second contact elements at first and second load ends thereof. The system includes one or more slider bodies slidably received in the receptacle, and the contact elements are partially mounted in the slider bodies. The system includes one or more pinch levers mounted to the lock body and movable from an inactive position to a locked position. When the pinch lever is moved to its locked position, the slider body is moved in the receptacle relative to the lock body, and the contact elements engage the source wires for electrical connection therewith.

A wireless power transmitter can include an inverter that generates an AC voltage; a wireless power transmitting coil that receives the AC voltage from the inverter, the wireless power transmitting coil being couplable to a wireless power receiving coil of a wireless power receiver; and controller circuitry that operates the inverter to deliver power wirelessly, using the wireless power transmitting coil, to the wireless power receiver by: characterizing a load line corresponding to the wireless power transmitter, the wireless power receiver, and a relative position between the wireless power transmitter and the wireless power receiver using a plurality of wireless power transfer system parameters determined by in-circuit measurements; identifying a stability boundary associated with the load line; and operating the wireless power transmitter at a power level that causes the wireless power transmitter to remain on a stable side of the stability boundary for the characterized load line.

The invention relates to the technical field of circuit model construction, and particularly discloses a vector model construction method for a heavy-load circuit, which comprises the following steps of: accurately matching model complexity, ensuring the practicability and accuracy of a model, setting a plurality of detection position points on the heavy-load circuit, and acquiring and analyzing electrical data of the plurality of detection position points, so as to construct a vector model for the heavy-load circuit. According to the method, the complexity of the vector model can be scientifically determined, so that an initial model fitting the reality is constructed, and the method has another advantage of dynamic adjustment and optimization capability, after a training data set of the initial model is selected, whether data input batch values need to be adjusted or not can be judged in time by monitoring parameters of a training process, and the accuracy of the data input batch values is improved. The simulation data of each monitoring position point is collected and compared with the actual input data for analysis, and the deviation in the model is found and corrected in time, so that the model is more perfect, and the accuracy and practicability of the model are ensured.

The application discloses a power grid key line comprehensive identification method based on a maximum deviation thought. Based on power grid structure information, combined with current operation state, four line key evaluation indexes of voltage stability, capacity margin, real-time failure rate and topological contact degree are established; based on the maximum deviation thought, a line comprehensive importance identification method considering subjective and objective weighting of different factors is proposed; a power supply capacity evaluation method of the system under line fault is proposed by adopting a control strategy of minimum load shedding amount of system optimal power flow, and it is verified that the identified lines are high-risk lines which will have a key influence on system operation. In the identification of the power grid key line, the application fully considers node voltage, line load, line fault, network topology and other information, considers the special situation of power grid splitting to form an island, excavates the information carried by the identification indexes, improves the identification accuracy of the power grid key line, and has guiding significance for the operation and maintenance management of the power transmission line.

The invention discloses a power supply control method, device and equipment and a computer readable storage medium, belongs to the field of power supply design, and aims to solve the problems that (1) an electric device can normally work in a certain power supply voltage range, and (2) under the same load current value, different power supply voltages output by a power supply module correspond to different electric energy conversion efficiencies. Therefore, the target load line value can be determined according to the real-time load current value, and then the target load line value is sent to the power supply module of the power utilization device, so that the power supply module adjusts the power supply voltage of the power utilization device through the load line based on the target load line value, and the power utilization efficiency can be improved on the basis of ensuring normal work of the power utilization device. Through fine adjustment of the load line value, the electric energy conversion efficiency of the power supply module is optimized, so that the energy consumption of the power utilization device is reduced, and the power utilization cost is reduced.

DC-DC power converters with closed loop error compensation can operate in pulse width modulation (PWM) mode and pulse frequency modulation (PFM) mode. The DC-DC power converter includes type III compensation, which can operate in PWM mode and PFM mode. The use of a bypass switch on the output inductance of the power converter can increase the stability of the loop including type III compensation.

The present invention discloses a method for dynamically optimizing the parameters of a power adapter for extending the device life, which relates to the technical field of adapter performance optimization and includes: using a test instrument to monitor and record in real time the changes in the output voltage, current, and power factor parameters of the power adapter under static and dynamic load conditions; identifying the trends and causes of abnormal parameter changes; performing thermal design optimization and temperature management on the power adapter; limiting the over-power and over-current for each pulse; introducing a power factor correction circuit; optimizing the switching frequency and output filter design; introducing a load line adjustment circuit to leave space for dynamic ripple when the output current jumps; evaluating whether the optimization effect reaches the expected goal. By introducing a power factor correction circuit and a load line adjustment circuit, the power factor of the power adapter is improved, harmonic pollution is reduced, the output voltage stability of the power adapter is improved, and its performance under dynamic load conditions is enhanced.

A photovoltaic grid connection path switching control method considering historical data includes the following steps: Real-time acquisition of voltage waveform data at the photovoltaic grid connection point for the first time period before an overvoltage occurs, as the real-time waveform; retrieval of voltage waveform data from the same time period of the previous day from a historical database, as the historical waveform; alignment of the real-time waveform and the historical waveform along their time axes, and comparison of similarity at preset intervals; if the similarity of all comparison intervals within the first time period is greater than or equal to a first preset threshold, then the overvoltage switching strategy of the same time period of the previous day is directly invoked, controlling the photovoltaic switching device to switch the photovoltaic grid connection path to a dedicated line or load line; otherwise, the switching strategy is adjusted or regenerated according to the type of deviation, and the corresponding switching operation is executed. This method avoids the delay caused by complex calculations each time, and eliminates misjudgments caused by occasional interference or changes in operating conditions through similarity judgment, ensuring the accuracy and adaptability of the strategy.

A loadline modulation power management circuit is provided. The loadline modulation power management circuit includes a power amplifier circuit and an acoustic filter circuit. Specifically, the power amplifier circuit is configured to amplify a signal to a time-variant output power based on a modulated voltage and the acoustic filter circuit is configured to pass the amplified signal for transmission in a transmit frequency. Herein, the power amplifier circuit is further configured to dynamically modulate a loadline impedance based on the time-variant output power to prevent the modulated voltage from exceeding a maximum level, whereas the acoustic filter circuit can help reduce overall transmit loss in the amplified signal. As a result, the loadline modulation power management circuit can operate with optimal efficiency and with reduced overall transmit loss.

The utility model relates to a power distribution system which comprises a distribution transformer line, a load line and first energy storage equipment. Wherein the output end of the distribution transformer line can be connected with the input end of the load line so as to transmit electric energy with the load line. The first energy storage device can be connected with a connection point between two load branches in the load line to provide electric energy for the load line or absorb electric energy in the load line. Visibly, in the embodiment of the invention, through a mode of arranging the first energy storage equipment between the two load branches in the load circuit, the electric energy can be provided for the load circuit or the electric energy in the load circuit can be absorbed through the first energy storage equipment, so that the electric energy of the power distribution system can be adjusted to meet the load change; and the load pressure of the upstream line of the access point can be greatly relieved, so that the reliability of a power distribution system can be improved.

A system may include a pulse-width modulation mode path configured to drive a load at an output of the system in a first mode of operation, a linear mode path configured to drive the load in a second mode of operation, a common mode control feedback loop configured to set a value of a common mode output signal at the output in the second mode of operation, and an auxiliary circuit coupled to the common mode feedback control loop and configured to maintain a state of the common mode feedback control loop during the first mode of operation as the state was or will be during the second mode of operation.

The invention belongs to the technical field of electronics, and provides a graphical method for solving a critical working point and an output range of an amplifying circuit. The method comprises the following steps: firstly, dividing three parameters of a working point into connotation and extension, designing connotation and extension of the working point, designing a concept of an alternating-current load line angular template, designing a key point that the angular template is suitable for passing through an intersection point of a direct-current load line and a current coordinate axis, and designing an intercept concept of the angular template on a voltage coordinate axis and an intercept calculation method; the angle template translates rightwards to line segments on two sides of an intersection point of the angle template and the direct current load line or a position when two projections on a coordinate axis are equal in length is a judgment rule of a critical working point; when the alternating-current load line angular template translates rightwards to a critical position, the collector-emitter critical bias voltage is equal to or converted to be equal to the output range of the amplification circuit, and during implementation, the scheme that the voltage serves as the abscissa axis and the current serves as the ordinate axis or the scheme that the current serves as the abscissa axis and the voltage serves as the ordinate axis can be adopted. The method is suitable for all three-configuration BJT or FET amplification circuits.

The present disclosure relates to devices and methods for detecting and preventing occurrence of a saturation state in a power amplifier. A power amplifier module can include a power amplifier including a cascode transistor pair. The cascode transistor pair can include a first transistor and a second transistor. The power amplifier module can include a current comparator configured to compare a first base current of the first transistor and a second base current of the second transistor to obtain a comparison value. The power amplifier module can include a saturation controller configured to supply a reference signal to an impedance matching network based on the comparison value. The impedance matching network can be configured to modify a load impedance of a load line in electrical communication with the power amplifier based at least in part on the reference signal.

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 application relates to a state identification method and a line load reduction system. The state identification method comprises the following steps: acquiring line data, wherein the line data comprises any one of a line electrical quantity and a first line power; acquiring a line allowable switching state according to the line data, wherein the line allowable switching state comprises a line switchable state and a line non-switchable state; acquiring an outlet fixed value state of a low-frequency low-voltage load reduction device, wherein the outlet fixed value state comprises an outlet input state and an outlet non-input state; and acquiring an outlet comprehensive state of the low-frequency low-voltage load reduction device according to the line allowable switching state and the outlet fixed value state, wherein the outlet comprehensive state comprises a comprehensive switchable state and a comprehensive non-switchable state. The method can distinguish between a load line and a power line in real time and accurately judge whether a line can be load-reduced and switched off.

The present invention relates to the field of load control, and in particular to a non-fixed load precision shedding method based on the consideration of fairness and effectiveness of load control. It comprises: collecting the power grid system frequency, calculating the frequency change rate, and judging whether to send a "prepare to shear load" instruction to all substations by monitoring the power grid system frequency and frequency change rate, and entering the load shedding amount calculation stage, calculating the load amount that needs to be sheared off in each area through a dynamic weighted load precision shedding algorithm, and calculating the total load shedding amount; based on the load amount that needs to be sheared off in each area, the substation optimizes the shedding combination of load lines in the area, and after the optimization is completed, the substation executes shedding, and the main station monitors the power grid system frequency and frequency change rate after shedding, and judges whether the locking conditions are met to stop further shedding. It solves the technical problem that power grid frequency monitoring mostly relies on low sampling rate equipment, which is difficult to capture rapidly changing frequency dynamics, resulting in delayed or misjudgment of instability detection.

The utility model relates to the technical field of electrical safety protection devices, in particular to a leakage protector with buzzing alarm and flashing prompt functions, which comprises a casing, a leakage detection module, a tripping mechanism and a control circuit, the leakage detection module is connected with a load circuit, and the tripping mechanism is connected with the control circuit. And the tripping mechanism is controlled by the control circuit to switch on and off the circuit, the sound-light alarm module and the fault type identification unit. According to the utility model, the problem that a user may not timely perceive the action of the leakage protector in some places where the environment is noisy or the attention of people is not concentrated, so that the leakage fault cannot be timely processed is solved, the environmental limitation is broken through through the acousto-optic cooperation of the multi-color LED lamp group and the buzzer, the fault is timely perceived, and the reliability of the leakage protector is improved. Electric leakage / overload is distinguished through light color and buzzing rhythm, and rapid maintenance is guided.