200 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.

A system powers a resistive load with switched direct current (DC) power. The high-speed switching of the resistive load heats up the resistive load with a pseudo-DC current. The resistive load can be a water heater element. The water heater can also have another heating element, which allows the pseudo-DC signal to pre-heat the water heater with local solar power, reducing the need for outside energy to power the other heating element.

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 method and a system for measuring transient temperature characteristics of a resistive load sample. The method comprises the following steps: keeping a light source on normally, adjusting a sample to different temperatures and collecting corresponding gray values, and drawing an average gray value-temperature curve graph of corresponding areas of different materials of the sample; a material with the maximum linear fitting slope absolute value of different average gray value-temperature curve graphs is selected, and a heat reflection calibration coefficient is calculated; applying low-frequency periodic square wave excitation to the to-be-detected sample, and obtaining the steady-state temperature change of the sample by using a camera; searching an area with the maximum steady-state temperature change of the sample, and marking the area as a hot spot area; adjusting the light source intensity to enable the photoelectric detector to be in a linear dynamic range; high-frequency periodic square wave excitation is applied to a to-be-detected sample, and a photoelectric detector is used for collecting transient temperature changes of a hot spot area of the sample. According to the invention, the measurement error of the light source caused by a pulse working mode is avoided, and the time resolution and the measurement accuracy of transient temperature characteristic measurement are improved.

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 embodiment of the invention provides a heating control system and method for a large-cavity press, and is applied to the field of temperature control systems, the heating control system comprises a heating control device, a programmable alternating current power supply, a universal meter, a transformer and a heater, and the heater is a resistive load in the large-cavity press; the heating control equipment sends a control instruction to the programmable alternating current power supply and sends a measurement instruction to the universal meter; the programmable AC power supply generates AC voltage and applies the AC voltage to the primary side of the transformer; the transformer regulates the alternating-current voltage, and the regulated voltage is applied to the two ends of the heater so that the heater can heat the alternating-current voltage; the universal meter collects a primary side voltage value output by the programmable alternating current power supply in the current power supply period and sends the primary side voltage value to the heating control equipment; and the heating control equipment calculates the voltage value of the alternating current wave required to be generated in the next power supply period and sends the control instruction containing the voltage value to the programmable alternating current power supply so as to carry out subsequent heating control, so that the control precision and the stability of the large-cavity press heating system are improved.

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.

A low-voltage differential signal receiver comprises a resistive load pair, an input stage, a current mode logic stage, a latch circuit and a comparison circuit. The input stage includes a P-type transistor pair and an N-type transistor pair. The P-type transistor pair and the N-type transistor pair are used for generating a first differential output voltage on the resistive load pair according to a differential input signal. The current mode logic stage is used for enhancing the gain of the first differential output voltage to the second differential output voltage. The latch circuit is coupled to the input stage for generating a third differential output voltage according to the second differential output voltage and for latching the third differential output voltage. The comparison circuit is coupled to the input stage and the latch circuit, and is used for comparing the first differential output voltage and generating a single-ended output signal. The input stage of the low-voltage differential signal receiver can cover a wide voltage range in differential input signals, so that a rail-to-rail input voltage range can be achieved.

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.

The present invention proposes a method for simulating a rectifier load of a peak factor and a power factor, which belongs to the field of AC electronic loads. By setting the power factor PF and the peak factor CF, the current waveform is set accordingly to simulate an inductive rectifier load, a capacitive rectifier load, a resistive rectifier load, and ordinary resistive, inductive, and capacitive loads. Specifically, when only the CF mode is set, the resistive rectifier load and the resistive load are simulated, and when only the PF mode is set, the inductive load and the capacitive load are simulated. The power factor PF and the peak factor CF are set at the same time, which can be used to simulate an inductive rectifier load, a capacitive rectifier load, a resistive rectifier load, and ordinary resistive, inductive, and capacitive loads. This method allows the user to accurately control the current waveform by adjusting two key parameters, thereby realizing the simulation of various load characteristics.

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.

The invention discloses a load system, and belongs to the field of generator set testing, the load system comprises a box body, a control system, a resistive load, an inductive load, a transformer and a switch cabinet, the control system, the resistive load and the inductive load are all arranged in the box body; the control system is used for communicating with each component and controlling the operation of each component; the number of the resistive loads is multiple, and each resistive load is used for converting electric energy into heat energy and carrying out continuous discharge test on equipment to be tested; the inductive load is used for adjusting the inductive load, is matched with the resistive load, adjusts the load power factor, and simulates the actual working state of the to-be-tested device. The transformer is used for providing power for a load system; the switch cabinet is used for controlling on and off of the load system, measuring data of equipment to be tested, protecting normal operation of the system and distributing electric energy. All the components are matched, the actual working load of the to-be-tested equipment can be effectively simulated, and the performance and stability of the to-be-tested equipment are evaluated.

The embodiment of the present application provides an electric device and an arc detection method and device thereof, the method comprising: sampling a current signal of a resistive load to obtain a sampling signal; amplifying the sampling signal to a range in which an arc detection device can distinguish between an arc critical point voltage and a reference voltage; and determining whether an arc exists by comparing a processed value of the amplified sampling signal with a preset value. The embodiment of the present application can improve the accuracy of arc detection, and is simple to implement and low in cost.

In at least some implementations, a discharge circuit for an electric vehicle, includes a link capacitor, a resistive load, a discharge switch coupled to the link capacitor and to the resistive load so that the link capacitor is coupled to the resistive load when the discharge switch is closed to enable discharge of the link capacitor, and a discharge interrupt assembly. The discharge interrupt assembly has a sensing resistor connected in series with the resistive load, and a temperature circuit. The temperature circuit has an input connected to the sensing resistor and an output, and the discharge interrupt circuit is responsive to a voltage at the output of the temperature circuit to open the discharge switch when the voltage from the temperature circuit is higher than a threshold.

A gate drive circuit for a power inverter branch in a power inverter includes a first power switch having a first reverse conducting channel and a second power switch having a second reverse conducting channel. The gate drive circuit comprises a first gate drive sub-circuit used for controlling switching of a first power switch; and the second gate driving sub-circuit is used for controlling the switching of the second power switch. The gate drive circuit controls switching of the first power switch and the second power switch in a complementary manner based on gate drive input signals to the first gate drive sub-circuit and the second gate drive sub-circuit. The gate drive input signal is indicative of a conduction condition of the first reverse conduction channel and the second reverse conduction channel and a slope of a load current in the inductive-resistive load.

The utility model provides a high power pulse discharge device, including power supply, pulse trigger control system, a plurality of discharge loop and oscilloscope, the discharge loop includes a plurality of discharge branch circuits that are connected in parallel, each discharge branch circuit includes switch tube and resistive load that are connected in order, each discharge branch circuit is connected with the pulse trigger control system, and the oscilloscope is connected with the switch tube and the resistive load. The oscilloscope is connected in parallel with each discharge branch and is used for monitoring the working voltage of each discharge branch in real time; the large-current pulse discharge test device can realize a pulse discharge test in a shorter time, can also realize a large-current discharge test, and is especially suitable for a large-current pulse discharge test of a large battery pack. Compared with the prior art, the device has remarkable advantages in the aspects of pulse time and discharge current, and can meet discharge test requirements of higher precision and higher power.

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.