114 results about "Resistive load" patented technology

The invention discloses a DC fault arc identification method and device based on a wavelet transform algorithm, and the method comprises the steps: collecting a DC line current signal through a high-bandwidth current sensor, carrying out the digitalization of a signal conditioning circuit and a high-speed ADC, and sequentially carrying out the preprocessing of the elimination of baseline drift through differential filtering and the suppression of specific frequency interference through adaptive notch; performing 3-8-layer multi-scale decomposition on the pure signal by adopting a Daubechies wavelet basis, preferably selecting high-frequency detail coefficients from the first layer to the third layer, and creatively fusing a multi-scale energy entropy representing energy distribution randomness and a time domain kurtosis representing transient impact to form a composite characteristic quantity; a threshold value (threshold value = mean value + adaptive coefficient * standard deviation) is dynamically generated based on sliding time window historical data, the adaptive coefficient is dynamically adjusted according to the load type, the resistive load is 1.8-2.2, and the inductive / capacitive load is 2.5-3.5; and when the composite characteristic quantity exceeds a threshold value and the sample proportion is greater than or equal to 85% within the duration of 0.5-5ms, a tripping execution mechanism is triggered.

The invention discloses a frequency quasi-independent controllable double-frequency electrically small rectification circuit, and belongs to the field of radio frequency energy collection. The rectifying circuit comprises a double-frequency matching network, a blocking capacitor, two Schottky diodes, a filter capacitor and a resistive load. The dual-frequency matching network is composed of a capacitor, an inductor and a microstrip line and used for achieving impedance matching of two working frequency points and achieving quasi-independent regulation and control of the positions of the two frequency points by adjusting the value of the inductor and the length of the microstrip line. And the microstrip line is bent for five times so as to realize the miniaturization of the overall structure of the circuit. The blocking capacitor is used for blocking a direct current component and avoiding energy feedback; the two Schottky diodes are used for converting a radio frequency signal into direct current energy; the filter capacitor is used for improving the smoothness of output direct current energy and improving the energy conversion efficiency. The device is compact in structure, adjustable in frequency point position and suitable for a dual-band radio frequency energy collection scene.

The invention discloses a variable-frequency power distribution system load control method and system, and the method comprises the steps: building a load operation feature library through collecting the current and voltage data of a power distribution loop, recognizing a motor load and a resistive load, and generating a variable-frequency flexible starting sequence; detecting harmonic content according to the power supply voltage waveform to generate harmonic distribution data, obtaining a filter inductance capacitance value and establishing voltage compensation configuration; performing power demand analysis on the variable-frequency flexible start sequence to identify a peak power period, generating a power distribution parameter based on power complementary association, executing power transfer processing between loads to form balanced start configuration, and coordinating the balanced start configuration and voltage compensation configuration to construct a control parameter set; and carrying out system resonance point detection on the coordination control parameter set to identify a dangerous parameter area, planning a safety parameter channel and generating a frequency conversion control instruction, so that integrated intelligent coordination of load control, electric energy quality management and system safety protection is realized, and the intelligent control level of a power distribution system is improved.

Inconclusive and inconsistent results from existing haptic testing systems, e.g. for trackpads, which include rigidly mounted resistive load cells and accelerometers, prevent accurate results, especially in a high-volume production context. The use of a rigidly mounted sensor is unsuitable because a trackpad will generally be softer than the actuation system, whereby, when the haptic event is fired, the vast majority of the energy will be lost in the trackpad, while the sensor remains almost stationary. Accordingly, an improved test probe for a haptic device configured for mounting on a robotic arm, comprises: a contact tip configured for contacting the haptic device; a sensor configured for measuring a threshold force of the piezoelectric actuator device, and an haptic characteristic, e.g. acceleration, of a resulting haptic response thereof at a same time and a same location; and a compliant element configured for enabling the sensor to move relative to the haptic device.

The invention discloses a rapid soft start control method and device for a switching power supply. The method comprises the following steps: determining a target voltage output by a soft start preprocessing circuit in a steady state according to a preset standard voltage, a preset standard current and a load resistance value of a resistive load; determining a target duty ratio corresponding to a switching tube of the soft start preprocessing circuit in a steady state according to the target voltage and a preset input voltage of the switching power supply; a first control signal is sent to the pulse width modulation circuit, and the duty ratio of the switching tube is adjusted to the maximum duty ratio; monitoring that the real-time output voltage of the soft start preprocessing circuit is increased to the target voltage through a voltage sampling circuit; and a second control signal is sent to the pulse width modulation circuit, and the duty ratio of the switching tube is adjusted from the maximum duty ratio to the target duty ratio, so that rapid soft start of the switching power supply is realized and a steady state is reached. According to the invention, the soft start time of the switching power supply can be obviously shortened, and the switching power supply can rapidly reach a stable working state after soft start.

The invention provides a current-limiting protection method and a current-limiting protection circuit. The current-limiting protection method comprises the steps of generating a preset wave-by-wave current value when an inverter is started and loaded, so as to carry out wave-by-wave current limiting on the inverter. And in the process of wave-by-wave current limiting, the phase difference between the phase current and the phase voltage of the inverter is obtained. And judging the load type of the inverter based on the phase difference between the phase current and the phase voltage. And adjusting the preset wave-by-wave current value according to the load type so as to match the load type. According to the invention, the load type of the inverter can be judged according to the phase difference between the phase current and the phase voltage, such as inductive, capacitive or resistive load. And then the preset wave-by-wave current value is adjusted according to different load types, so that the inverter can better adapt to loads with different characteristics. Namely, the wave-by-wave current value can be dynamically adjusted according to the type of the load, so that the inverter can adapt to the change of the load in time, and the operation stability of the inverter is improved.

To improve the efficiency of a wind power generation system in a wide range of wind speed sections including a low-speed rotation section where the wind speed is low by quickly following an instantaneous change in wind speed.SOLUTION: The wind power generation system includes a lift-type fixed wing fixed to a rotating shaft, a plurality of three-phase AC generators, a step-up / down converter and a resistance load constituting a load of the wind power generator, and a system controller, and the three-phase AC generator has a rectifier unit that converts a three-phase AC output into a DC output. The step-up / down converter may be connected to the rectifier unit, and the system controller may control the load to follow an optimal TSR (λ) suitable for the fixed wing according to a change in wind speed in real time based on a rotation speed of the rotating shaft, information on a super-instantaneous wind speed obtained from an anemometer, an output of the generator, and a state of the load.SELECTED DRAWING: Figure 12

The invention relates to a method and a circuit for identifying capacitive and resistive load short circuits in an alternating current load. The circuit comprises a current detection unit A, an MOS (Metal Oxide Semiconductor) tube switch unit B, a residual current sampling unit E, a live wire / zero line load short circuit detection unit C, a test power supply control unit D, a live wire / live wire short circuit detection unit F, an MCU (Microprogrammed Control Unit) operation control unit G and a power supply unit H, according to the method, short circuits between a zero line and a live line, between a live line and a ground line and between live lines can be identified independently or simultaneously; the method is a rapid identification method considering capacitive load false short circuit and resistive short circuit (true short circuit) current, the short circuit protection time is less than or equal to 150 microseconds, the identification period time is less than or equal to 10 milliseconds, and through the circuit technology, the identification error phenomenon caused by the fact that a load output end protected by an MOS tube electronic switch is connected with the capacitive load can be reduced.

The utility model discloses an LED lamp control circuit capable of suppressing electromagnetic interference of a fan, which comprises a fan host controller for supplying power to a lamp panel and transmitting light adjusting signals through two output lines; a rectifying circuit is arranged on the lamp panel, is connected with two output lines of the fan host controller and is used for rectifying an input power supply; the LED driving circuit is used for driving the LED lamp group to emit light and work; the zero-cross detection circuit is connected with the output end of the rectifying circuit and is used for detecting a light adjusting signal in the input power supply; the MCU main control circuit is respectively connected with the LED driving circuit and the zero cross detection circuit, and controls the LED driving circuit to work according to the light adjusting signal; and the electromagnetic interference suppression circuit is connected with the output end of the rectifying circuit and is used for suppressing electromagnetic interference signals input to the rectifying circuit and the zero-cross detection circuit by the fan host controller, so that the lamp panel circuit serving as a capacitive load and the electromagnetic interference suppression circuit serving as a resistive load are connected and complemented, and the electromagnetic interference is suppressed.

The invention provides an unmanned aerial vehicle wireless energy taking control method, device and system, and relates to the technical field of power systems and wireless charging. The method comprises the steps of obtaining power transmission line current parameters; based on the power transmission line current parameters, target load modes are determined, and the target load modes comprise a pure resistive load mode and a resistive-capacitive load mode; according to the target load mode, adjusting impedance characteristics of an adjustable electronic load in the unmanned aerial vehicle wireless energy taking control device and excitation parameters of an energy taking iron core in the unmanned aerial vehicle wireless energy taking control device; and according to the adjusted excitation parameters and impedance characteristics, the unmanned aerial vehicle wireless energy taking control device is controlled to output stable direct current voltage. The method is used for improving the energy taking stability and the energy taking efficiency of the unmanned aerial vehicle in operation states such as inspection, so that the unmanned aerial vehicle can work continuously, and the overall operation efficiency is improved.

The invention relates to a power regulation method for a heating element and to a control system for implementing said method, with said method comprising applying the cycle stealing technique to adjust the power supplied to the resistive load at multiple levels, such that the modulation period is increased, reducing the frequency of the current signal that modulates the carrier, in order to reduce the generation of harmonics. The control system comprises a controller (2) connected to a power regulator (3) that acts on the heating element (1), such that said controller (2) adjusts the power supplied by the regulator (3) to the resistive load of the heating element (1) using the fine-grain cycle stealing technique.

This disclosure provides a distributed control method and system for DC microgrids based on optimal power generation cost, relating to the field of distributed control technology for DC microgrids. Distributed control is achieved through controllers installed in each converter. Specifically, the method involves: acquiring operating data from adjacent converters to estimate global information of the DC microgrid; estimating the optimal current value based on the global information, and calculating the adaptive droop gain in real time using the optimal current value; compensating for voltage deviation based on the calculated adaptive droop gain and the line resistance of each converter to obtain the compensated bus voltage; and performing droop control and secondary voltage regulation control on the DC microgrid based on the adaptive droop gain and the compensated bus voltage to ensure that the output current of each converter tracks the optimal current value in real time, ensuring that the bus voltage remains stable at its rated value. Even under resistive load variations, this invention can still guarantee the optimal output current of each distributed converter, ensuring minimum power generation cost and achieving voltage stability.

A method and controller are provided for operating an isolated or weakly connected electrical grid supplied by at least one fluctuating renewable energy source, such as wind or photovoltaic generation, in combination with a grid-forming controllable inverter coupled to a battery. The inverter operates as a master controller to regulate grid frequency and voltage, while the renewable sources operate as slaves. Battery charging and discharging are controlled according to deviations in grid frequency and charge level, with slopes defined for smooth power transitions. Additional selectively driven or non-driven alternators may be coupled in parallel with the inverter to stabilize frequency, provide inertia, reactive power, and short-circuit capacity, or support load changes. Control logic further manages integration of combustion engine-driven generators, resistive load banks, and external energy banks, while accounting for battery temperature and charge thresholds, thereby ensuring stable grid operation under fluctuating generation and demand conditions.

A mobile battery manager (102) for charging or discharging a stored battery system may include a converter, a resistive load (106), and a controller (104) configured to charge or discharge the stored battery system to a desired state of charge determined at the mobile battery manager (102).

The invention discloses a cascade and cross-coupling bandwidth trans-impedance amplifier for visible light communication, which adopts a fully differential topological structure and consists of a cascade enhanced input stage, an active current source load and a cross-coupling bandwidth compensation network, an enhanced feedback loop is constructed in a multi-stage cascade mode; a multi-stage common-source amplifier is connected in series in a feedback path of an input end; replacing a traditional resistive load with a current source: replacing a common-gate load resistor with the current source; the differential output end of the circuit is connected with a pair of cross coupling transistors, and the grid electrodes and the drain electrodes of the transistors are connected in a cross mode to form a positive feedback mechanism. The invention provides a novel RGC-TIA structure adopting optimized bias and cascade feedback, and by breaking through voltage margin limitation, high gain, wide bandwidth and good linearity and common-mode rejection performance are realized at the same time.

The application discloses a load switching circuit, a load switching method and a household device, wherein a receiving module, a control module, a resistive load module and an inductive load module are included. The receiving module acquires an instruction signal; the receiving module sends the instruction signal to the control module; the control module determines a load module corresponding to the instruction signal according to the instruction signal, selectively controls the resistive load module or the inductive load module to work, receives a control signal transmitted by the control module through the receiving module, and transmits the control signal to the resistive load module and the inductive load module; according to specific instructions of the control signal, it is determined whether the resistive load module or the inductive load module works, different load type modules work according to user requirements, and the problem that different loads require different topological circuit requirements is overcome.

A controller system for a bathing installation such as a spa, whirlpool bath or a pool, the bathing installation including a line voltage AC supply for selectively powering peripherals. The controller system includes an electronic controller configured to manage and control various peripherals such as heaters, pumps, and lights, by modulating the outputs to these peripherals, through the use of one or more Variable Frequency Drives (VFDs) for driving rotating loads and TRIACs with phase angle modulation for driving resistive loads. An exemplary embodiment also features a modular electronics design, allowing for flexible and customizable control of the spa system. Elements of the design include a high voltage bus, card edge connections, and the separation of high voltage and low voltage components.

This utility model relates to the field of electric arc experiment simulation technology, and in particular to a DC electric arc experimental platform, comprising: a DC power supply, an intelligent controller, an adjustable resistive load box, a DC electric arc generator, and a circuit breaker. The intelligent controller, DC power supply, circuit breaker, adjustable resistive load box, and DC electric arc generator constitute the main circuit. When the adjustable resistive load box is connected in series with the DC electric arc generator, it is used to simulate a series-type fault arc generated in a DC power supply system; when the adjustable resistive load box is connected in parallel with the DC electric arc generator, it is used to simulate a parallel-type fault arc generated in a DC power supply system. This utility model simulates the generation of DC electric arcs through experiments, facilitating subsequent exploration of the interaction mechanism between various physical quantities and the generation of DC electric arcs, and providing great convenience for studying the generation mechanism and characteristics of DC electric arcs.

The invention discloses a method for simulating a dynamic starting characteristic of a low-power Hall thruster, which comprises the following steps of: analyzing a transfer function form of each module, measuring input and output parameters of each module on a thruster entity, and obtaining a transfer function of each module through an MATLAB system identification tool box; rLC circuit structures corresponding to all the modules are designed respectively, transfer functions of the RLC circuit structures are made to be consistent with transfer functions obtained through system identification, parameters of all components of the RLC circuits are calculated, simulation is conducted through simulink, the parameters of the components are further adjusted and optimized, and simulation results are made to be basically consistent with dynamic starting characteristics and steady-state parameters of actually-measured parameters; and finally, the RLC circuits are connected according to the connection relation of all modules of the thruster. The simulated load device can be used for circuit simulation in the development stage of the PPCU and testing in the production stage and the system joint test stage, compared with a pure resistive load, the model can preposition the risk of poor dynamic matching between the PPCU and the thruster, performance optimization of the PPCU product is facilitated, and the iteration efficiency is improved.

A pulsed bidirectional RF source / load is provided. The RF power system includes a main RF generator and an auxiliary RF generator, each of which outputs a corresponding RF signal. The main RF generator also outputs an RF control signal to the auxiliary RF generator, and the RF signal output by the auxiliary RF generator varies according to the RF control signal. The auxiliary RF generator receives a sense signal indicating electrical characteristics of the respective RF signals output by the main RF generator and the auxiliary RF generator. The auxiliary RF generator determines a phase difference between the RF signals. The sensed electrical characteristics and phase are used independently or in conjunction to control the phase and amplitude of the RF signal output by the auxiliary RF generator. The auxiliary generator includes an inductive clamp circuit that returns reflected energy from the coupling network to the variable resistive load.

The application discloses a variable frequency power distribution system load control method and system, constructs a load operation characteristic library by collecting current and voltage data of a power distribution circuit, identifies motor loads and resistive loads and generates a variable frequency flexible starting sequence; generates harmonic distribution data according to power supply voltage waveform detection harmonic content, obtains filter inductance and capacitance values and establishes voltage compensation configuration; performs power demand analysis on the variable frequency flexible starting sequence to identify peak power time periods, generates power distribution parameters based on power complementary correlation, performs load power transfer processing to form balanced starting configuration, coordinates the balanced starting configuration and the voltage compensation configuration to construct a control parameter set; performs system resonance point detection on the coordinated control parameter set to identify dangerous parameter areas, plans a safe parameter channel and generates a variable frequency control instruction, and realizes integrated intelligent coordination of load control, power quality management and system safety protection, and improves intelligent control level of the power distribution system.

Information is provided about the "Power Quality Analyzer" (PQA) [1] device, current transformers, toroidal rings, panel rails and the functions of these components. PQA [1] device detects and measures power quality problems by analyzing the quality of electrical energy. A toroidal current transformer [2] is a transformer used to measure or monitor current in electrical circuits. Toroidal rings [3] are used to direct or focus magnetic flux. Panel rails [4] are used to mount components in electrical panels in an orderly manner. In addition, the toroidal current transformer top cover [5] and toroidal current transformer bottom cover [6] protect the internal components of the current transformer and are used for mounting. The fact that these components can be plugged and unplugged reduces the cost of wiring between the measurement transformers and the PQA device [1] and ensures safety. In addition, it is stated that the invention increases data accuracy by reducing cables that create resistive loads over long distances. The invention also uses the advantage of being attachable and detachable / removable in order to ensure structured operation in complex power plants by allowing the toroidal rings [3] to be located near or on the PQA [1] device. The toroidal current transformer [2] can be connected to the Power Quality Analyzer [1] device with at least one connector or at least one cable and at least one cable connector. The connection method in question can be decided according to the proximity of the toroidal current transformer [2] to the Power Quality Analyzer [1], In dense and crowded panels, the ability to mount the toroidal current transformer on the device ensures the most efficient use..

Provided is a customer‑sited hybrid generator system that coordinates a bidirectional inverter, an energy storage battery, an engine‑driven generator, an optional renewable source, a controllable load bank, and an isolation switch under a supervisory controller, to supply facility loads and interact with a power grid. The controller enables multiple modes, including surge support during normal operation, under‑frequency export from the battery with generator takeover, over‑frequency import to charge the battery, and distributed curtailment using a resistive load thermally coupled to a liquid cooling loop. Electrically driven pumps and fans, a radiator, and a three‑way valve route coolant among power electronics, engine, and curtailment loops. During a grid outage, the system may connect the generator directly to a facility bus, while isolating the inverter so the battery‑backed inverter can provide parallel hybrid surge. The system interfaces with utility or VPP dispatch and supports either 50 Hz or 60 Hz interconnection

The application relates to a method and circuit for identifying short circuit of capacitive and resistive loads in an alternating current load, the circuit comprising a current detection unit A, a MOS tube switching unit B, a residual current sampling unit E, a load short circuit detection unit C of a live wire / zero line, a test power supply control unit D, a live wire / live wire short circuit detection unit F, an MCU operation control unit G and a power supply unit H; the method can separately or simultaneously identify short circuit between the zero line and the live wire, the live wire and the ground wire and the live wire and the live wire; the method is a fast identification method considering both the capacitive load false short circuit and the resistive short circuit (true short circuit) current, the short circuit protection time is less than or equal to 150 microseconds, the identification cycle time is less than or equal to 10 milliseconds, and through the circuit technology, the identification error phenomenon caused by the capacitive load connected to the load output end of the MOS tube electronic switch protection can be reduced.

A solar tracking system includes a solar array, a support structure configured to support the solar array, a driveshaft coupled to the support structure, a base configured to rotatably support the driveshaft, and an articulation system coupled to the driveshaft and configured to articulate the driveshaft relative to the base. The articulation system includes a gearbox coupled to the driveshaft. The solar tracking system also includes a motor mechanically operably coupled to the gearbox to cause the driveshaft to rotate, and a controller that determines a fault caused by the winding up of the driveshaft, and, in response to determining the fault, shorting the windings of the motor and / or providing power, which is generated by the motor when the unwinding driveshaft drives the rotation of the motor, to a load, such as an energy storage device, a resistive load, and / or a heating element.

The invention relates to an electric energy meter resistive load identification method for eliminating an air conditioner, and the method comprises the steps: determining whether a load is suspected of being an air conditioner or not through employing an air conditioner elimination algorithm after the load is determined to be a resistive load, and the air conditioner elimination algorithm specifically comprises the steps: recording a power value when the load is connected after the resistive load is identified, and a power value per second within the next N seconds; calculating a root mean square of a power value within N seconds after the load is accessed; the root-mean-square is compared with a set threshold value, if the root-mean-square exceeds the threshold value, it is judged that the load is suspected to be an air conditioner, and tripping is not conducted; otherwise, judging that the load is not an air conditioner, and tripping. Compared with the prior art, the method has the advantages of being low in cost, capable of accurately recognizing the air conditioner and suitable for large-area upgrading of the college dormitory electric control system, and therefore the problem that the college dormitory electric control system trips by mistake due to use of the air conditioner is solved.

The utility model discloses a load testing device based on aging of a high-power electronic switch module. The device can verify the loading capability and the heat dissipation capability of an electronic switch. The device comprises a main power supply, a three-phase voltage regulator, a wire inlet switch, a three-phase isolation transformer, an electronic switch, an air switch and a resistive load. The input end of the three-phase voltage regulator is connected with a main power supply of a power grid, the wire inlet end of the wire inlet switch is connected with the output end of the three-phase voltage regulator, the wire outlet end of the wire inlet switch is connected with the primary side of the three-phase isolation transformer, and the secondary side of the output end of the isolation transformer is connected with the input end of the electronic switch. The output end of the electronic switch is connected with the input end of the load side air switch, and the output end of the load side air switch is connected with the resistive load in a series-parallel connection mode. The load testing device is applied to the technical field of the load testing device based on aging of the high-power electronic switch module.

The invention discloses a three-phase load test circuit for testing a motor driver, and the circuit comprises a three-phase bridge driver which is used for generating a three-phase AC voltage signal; the synchronous rectification module is used for synchronously rectifying the three-phase alternating-current voltage signal into a direct-current voltage signal and providing the direct-current voltage signal to an electronic load; the electronic load is used for simulating a resistive load and completing the test under the driving of the direct-current voltage signal; wherein the electronic load is set to be in a current source mode in which the magnitude of output current is adjustable; the MCU controller is used for calculating a PWM (Pulse Width Modulation) signal with a target duty ratio according to the electronic load feedback signal; the isolation driver is used for driving the three-phase bridge driver and the synchronous rectification module to work according to the PWM signal; the synchronous rectification module comprises a power inductor used for simulating an inductive load. A conventional resistive load test scheme is replaced by a scheme of combining an inductive load and an electronic load, and the method can be suitable for load verification test and aging screening test of the motor driver with any load current.

In certain examples, methods and semiconductor structures are directed to circuit-based apparatus in which an amplifier includes stacked, first and second circuit amplification stages to operate out of phase from one another for providing a push-pull operation, with each of the first and second circuit stages including a switching circuit and an impedance path to drive the switching circuit. The apparatus further includes a waveform-shaping circuit to shape, in response to each of the first and second circuit stages, a voltage signal for presentation to the switching circuit. As may be implemented in various more-specific examples, the apparatus may generate a constant output voltage with high efficiency across a wide range of resistive loads.

The invention discloses a non-intrusive air conditioner load decomposition method and a storage medium, and the method comprises the steps: collecting a high-frequency current sampling sequence at a user ammeter at a sampling rate not lower than 6400 Hz, and obtaining a time domain waveform sequence and a frequency domain harmonic sequence of the high-frequency current sampling sequence; a time domain convolutional network and a frequency domain convolutional network which are parallel are constructed as a feature extraction network, a trained feature extraction network is obtained through two-stage training, a high-frequency current sampling sequence obtained in real time is input into the trained feature extraction network, and a reconstructed air conditioner power waveform is output. According to the method, through time-frequency double-domain feature fusion and two-stage decoupling modeling, the problems that the air conditioning load and the resistive load are easy to confuse and are lost due to long-period dependence are solved, and the decomposition precision and robustness are remarkably improved.