279 results about "Light load" patented technology

The invention discloses a method for improving Buck light load efficiency, which can prevent pseudo CCM operation and can keep high light load efficiency even under a large duty ratio, and comprises the following steps: after soft start of a Buck converter is completed, an enable signal at the end of soft start sets an RS trigger U3 to be in an active state, and if an inductive current zero-cross detection trigger signal rises, the RS trigger U3 is in a non-active state, the RS trigger U3 is in a non-active state, and if the inductive current zero-cross detection trigger signal is in a non-active state, the RS trigger U3 is in a non-active state. When the high-end switch and the synchronous low-end switch are switched on, the setting end input of the RS trigger U3 is triggered, a switch starting signal output by the RS trigger U3 is set at the beginning of each switching period, the switch starting signal controls the constant on-time generator to modulate the charging current or capacitance so as to prolong the time of simultaneously switching off the high-end switch and the synchronous low-end switch, and when the synchronous low-end switch is switched on, the synchronous low-end switch is switched off. And the reset end of the RS trigger U3 inputs an output signal of the constant on-time generator to trigger the RS trigger U3 to reset.

The invention provides a cascade water-light complementary scheduling method for a water-light load multi-uncertainty distribution network system. The method belongs to the field of power system dispatching optimization. A cascade hydropower station power generation model, a photovoltaic power generation model and a distribution network system model are combined to establish a cascade water-light complementary power generation joint optimization scheduling model; converting the cascade water-light complementary power generation joint optimization scheduling model into a two-stage robust optimization model, and performing linearization processing; decomposing the two-stage robust optimization model into a main problem and a sub-problem; loosening the decomposed sub-problem and constructing a new objective function to obtain an infeasible test sub-problem; and iteratively solving the main problem, the sub-problems and the infeasible test sub-problems to obtain a day-ahead scheduling plan. According to the method, multiple uncertainties of natural incoming water and photovoltaic output of the small hydropower station are considered, the power generation flexibility of the cascade hydropower station is excavated to improve the photovoltaic absorption capacity, and efficient solution of the model is realized by providing a linearization method of the hydropower model and a sub-problem feasibility test method.

The invention provides a light load control method, an LLC resonant converter using the same and a storage medium, the method is based on a double closed-loop control structure of a voltage outer loop and a current inner loop, different load conditions are adapted by automatically switching a PFM mode, a PWM mode and a BURST mode, and the method comprises the following steps: setting control parameters; sampling an output voltage Vout and an output current Iout of the LLC resonant circuit; inputting a voltage error obtained by comparing a preset reference voltage Vref with the output voltage Vout into a PI controller of a voltage outer loop, and calculating to obtain a reference current Iref; a current error obtained by comparing the reference current Iref output by the voltage outer loop with the output current Iout is input into a PI controller of the current inner loop; and judging the working mode of the current control period according to the duty ratio Duty of the previous control period and the frequency demand f output by the current inner loop. According to the invention, through combination of double closed-loop control and three-mode intelligent switching, comprehensive optimization of efficiency, dynamic response and output voltage quality in a full-load range is realized.

The invention discloses a bus voltage adjusting method, a compressor and a computer readable storage medium, and the method comprises the steps: obtaining a compressor parameter, a temperature parameter, an operation state parameter and an electrical parameter of target equipment, and generating collection data; based on the collected data, the working state of the compressor is determined; wherein the working state comprises a light load state, a normal load state, a heavy load state or an overload state; generating a predicted bus voltage based on the working state of the compressor and the historical acquisition parameters; and the current bus voltage is determined according to the working state of the compressor and the predicted bus voltage, and voltage adjustment is carried out according to the current bus voltage. The application can dynamically match the compressor load demand to reduce the switching loss, uniformly distribute the operation loss to improve the thermal management, and predict the voltage demand in advance to actively adjust to enhance the electric control reliability.

The invention provides an intelligent lighting and energy consumption management system of a rail transit vehicle. The intelligent lighting and energy consumption management system comprises a vehicle working condition-space environment fusion sensing module; a passenger flow space-time distribution accurate analysis module; an illumination load-whole vehicle energy consumption coupling calculation module; an energy storage-network voltage cooperative load regulation module; a hierarchical dynamic illumination driving module; and an energy consumption closed-loop feedback and strategy self-optimization module. The design limitation of a traditional lighting system is broken through, lighting load precise adaptation, power supply source optimal distribution, energy consumption collaborative optimization and system strategy self-iteration are achieved, lighting experience, driving safety, power supply stability and whole vehicle energy consumption rationality are considered, and all-working-condition and all-scene operation requirements can be met without manual intervention.

The application relates to a charging control method of a mobile power supply and the mobile power supply. The charging control method of the mobile power supply comprises the following steps: in response to the mobile power supply being woken up, a predetermined number of broadcast messages are sent; it is determined whether a feedback message for the broadcast message is received; when the feedback message is not received, a light load detection duration is set as a first duration; the first duration is lower than a preset value; it is determined whether an output parameter of the mobile power supply is continuously less than a predetermined threshold value within the light load detection duration; if the output parameter is continuously less than the predetermined threshold value within the light load detection duration, the mobile power supply is controlled to enter a sleep state after the light load detection duration. In this way, a shorter light load detection duration is set when no device is accessed, so that the light load detection for a long time when no device is accessed is avoided, and power consumption is generated.

The utility model relates to the technical field of mounting supports, and discloses a signal lamp stable mounting support which comprises a traffic light, a clamping plate is arranged on the outer wall of the traffic light, a wedge-shaped block is fixedly connected to the lower end of the clamping plate, a sliding block is fixedly connected to the rear end of the wedge-shaped block, a supporting plate is arranged at the lower end of the traffic light, and an air cylinder is fixedly connected to the upper end of the supporting plate. The driving end of the air cylinder is fixedly connected with a sliding rod, the sliding rod is slidably connected to the inner side of the wedge-shaped block, a fixing plate is arranged at the rear end of the air cylinder, a sliding groove is formed in the inner wall of the fixing plate, the sliding block is slidably connected to the inner wall of the sliding groove, the bottom end of the supporting plate is fixedly connected with a vertical rod, and the outer wall of the vertical rod is fixedly connected with a hydraulic rod. According to the utility model, the clamping device is driven by the cylinder to replace the traditional traffic light loading and unloading mode, thereby improving the maintenance efficiency and reducing the cost. Meanwhile, the design that anti-collision rubber is combined with hydraulic current limiting is adopted, collision energy is effectively absorbed, the signal lamp is protected against vibration damage, and the service life is prolonged.

The air conditioner comprises a refrigerant circulation loop, a condensation temperature sensor, a PFC circuit and a controller, and the controller is configured to obtain the current effective value, the voltage peak value, the condensation temperature, the compressor operation frequency and the actual bus voltage value of alternating current input voltage; determining a bus coefficient according to the current effective value and the voltage peak value, or determining a target coefficient according to the current effective value, the voltage peak value, the condensation temperature and the compressor operation frequency; determining a target bus voltage value according to the product of the voltage peak value and the target coefficient; and generating a voltage control instruction according to the target bus voltage value and the actual bus voltage value, and outputting the voltage control instruction to the PFC circuit, so that the PFC circuit controls the on-off state of an internal switching tube based on the voltage control instruction, and the actual bus voltage value reaches the target bus voltage value. The overhigh bus voltage caused by the adoption of the fixed bus voltage under the condition of light load or high input voltage is avoided, and unnecessary switching loss is inhibited.

The invention relates to the field of power electronic converters and control, in particular to an SOP power module dead-zone effect suppression method, which comprises the following steps: acquiring the current transmission power of an SOP power module; based on the transmission power, generating a first bus voltage instruction used for controlling an AC-DC side direct current bus voltage and a second bus voltage instruction used for controlling a DC-AC side direct current bus voltage, adjusting the corresponding direct current bus voltage so as to inhibit polarity reversal of a DAB converter bridge port voltage, and according to the transmission power of the SOP power module, adjusting the polarity of the DAB converter bridge port voltage. A first bus voltage instruction and a second bus voltage instruction are generated, the first bus voltage instruction and the second bus voltage instruction are made to be unequal during light load, a bus voltage difference value is formed, and it is ensured that the direct-current bus voltages on the two sides meet the condition for restraining DAB bridge port voltage polarity reversal in the dead-zone time period by means of compensation for frequency doubling fluctuation components in the direct-current bus voltages. Current zero step is eliminated, soft switching is recovered, voltage stability under light load is improved, extra hardware or complex control is not needed, and engineering realization is simple and convenient.

The application discloses a kind of data center intelligent power distribution system electric capacity dynamic monitoring and early warning method, it is related to electric capacity dynamic monitoring technical field, including using current decomposition method to the power load of data center power supply system is hierarchized decomposition, obtain current, pre-increased current and charging current;Using dynamic aggregation calculation method to the current data after decomposition is gradually summarized, obtain the expected current, maximum current and expected maximum current of each level;Using load rate calculation method to the current data after aggregation is normalized, obtain the current load rate, expected current load rate, maximum current load rate and expected maximum current load rate of each level;Using three-level early warning threshold method to the load rate obtained by calculation is threshold comparison, and according to preset light load, heavy load, overload threshold triggers corresponding level capacity early warning signal;Using scene adaptation method to early warning signal is classified processing.

The objective is to provide a switching power supply equipped with an AC / DC converter having an AC filter circuit and a PFC circuit, which prevents a decrease in power factor even under light load conditions. [Solution] The problem is solved by a switching power supply device comprising an AC / DC converter having a PFC circuit and a pulse signal generation unit that generates pulse signals for driving the switch elements of the PFC circuit so that the voltage of the AC / DC converter becomes a predetermined target value, wherein the AC / DC converter further comprises an AC filter and a current sensor that monitors the current of the AC power supply in order to generate the drive pulse signals for the switch elements, and the current sensor is disposed on the AC power supply side of the AC filter.

A control apparatus includes a first signal generator configured to generate a first reset signal for determining an on-time of a high-voltage side switch of a first phase of a multi-phase power converter; a first comparator configured to generate a first set signal for determining a conduction moment of the high-voltage side switch of the first phase based on comparing the first current sensing signal and the voltage control signal; a first zero-crossing detection circuit configured to detect a zero-crossing point of the inductive current of the first phase; and a first phase bias voltage generator configured to generate a first bias voltage for configuring the first phase to exit the first continuous conduction mode when a zero crossing point of the inductive current of the first phase is detected.

The invention discloses a comprehensive optimization design method for electromagnetic thermal performance of a permanent magnet motor, belongs to the technical field of optimization design of motors, and aims to solve the problem that the optimization speed and the optimization precision are difficult to consider at the same time according to the optimization design method for the electromagnetic thermal performance of the motor with multiple structural parameters. Optimization is carried out based on the incidence relation between the electromagnetic performance and the thermal performance, the electromagnetic performance is directly associated with the structural parameters, and the thermal performance is indirectly associated with the structural parameters. The optimization design comprises the following steps: constructing an overall optimization task of structural parameters and electromagnetic thermal performance; dividing into a plurality of sub optimization tasks; the optimization sequence of the sub-optimization tasks is determined and solved in sequence, the electromagnetic performance index is prior to the thermal performance index, and the no-load performance is prior to the light-load performance, the rated performance and the overload performance; and integrating sub-optimization results to form a final scheme. According to the method, a high-dimensional optimization problem is decomposed into low-dimensional sub-problems and the low-dimensional sub-problems are solved in order, so that the calculation complexity is reduced on the premise of ensuring the precision, and the optimization speed and the optimization precision are considered.

The invention discloses a cross-domain PaaS application elastic expansion system, method and device based on a micro-service architecture and a medium, and belongs to the technical field of micro-services, and the system comprises a service registration center, a load state evaluation module, a light load state resource optimization module, an overload state resource optimization module and an execution module. The service registration center is used for receiving the micro-service information and summarizing and storing the micro-service information to form a micro-service list; the load state evaluation module is used for monitoring the index data of the micro-service in the micro-service list, and evaluating the load state of the micro-service according to the index data to obtain a load state evaluation result of the micro-service; the light load state resource optimization module is used for generating a resource recovery decision; the overload state resource optimization module is used for generating a resource extension decision; and the execution module is used for executing the resource recovery decision and the resource extension decision. According to the invention, a cross-domain resource coordination allocation mechanism is combined with service priority arbitration, so that the problem of unreasonable resource allocation is solved.

The application provides a bootstrap driving control device and a control method. The device comprises a full-bridge circuit and a bootstrap driving circuit. The full-bridge circuit comprises first to fourth MOS transistors and first to fourth diodes. The bootstrap driving circuit comprises a bootstrap driving module, first and second bootstrap capacitors and a fifth diode. The bootstrap driving module is used to load the voltage of the first and second bootstrap capacitors to the gate of the second MOS transistor when the first MOS transistor changes from on to off and the fourth MOS transistor changes from on to off, and is also used to load the first power supply voltage and the voltage of the first bootstrap capacitor to the gate of the first MOS transistor when the second MOS transistor changes from on to off and the third MOS transistor changes from on to off. The bootstrap driving circuit is used to control the third and fourth MOS transistors to be continuously turned on in the respective working half cycles, so as to realize sufficient charging of the bootstrap capacitors, and to realize smooth turning on of the first and second MOS transistors when the full-bridge circuit enters a light load mode.

The invention relates to a light load type heavy hammer, and belongs to the technical field of breaking hammers, the light load type heavy hammer comprises a hammer body and a drill rod, the hammer body is slidably provided with two pressing plates, the pressing plates slide in the length direction of the drill rod, and the two pressing plates are symmetrically arranged on the two sides of the drill rod; a guide assembly used for controlling the sliding direction of the pressing plate and a driving assembly used for providing power for moving of the pressing plate are arranged on the hammer body, the multifunctional breaking hammer has the advantages that the site environment is maintained, broken stone splashing is reduced, and the multifunctional breaking hammer is improved, the supporting ring made of PEEK is arranged, and the effects of guaranteeing stable operation of the piston and preventing steel from being pulled are achieved.

The utility model relates to the technical field of transformers, in particular to an adjustable inductance structure for a high-frequency transformer. According to the technical scheme, the transformer comprises a set of bases used for supporting, iron stands are fixedly arranged on the upper surfaces of the bases, and coils are wound around the outer walls of the iron stands; the iron core is arranged in the iron stand in a penetrating mode, and an electromagnetic adjusting assembly used for adjusting the magnetic conductivity of the iron core is arranged in the iron stand. The adjustable inductor structure can block a magnetic field to form magnetic resistance, so that the position of the magnetic field is changed, and the adjustable inductor structure shows strong flexibility for complex and changeable working conditions. No matter under different load conditions of light load, full load or overload, the high-frequency transformer can accurately match the current load requirement and always maintain a stable operation state by conveniently adjusting the inductance value, so that the application range of the high-frequency transformer is greatly expanded, and the continuity and reliability of power transmission are ensured.

The objective of the present invention is to provide a wireless power transmission device and method for controlling an inverter such that ping signals are periodically or intermittently transmitted through a coil, controlling a converter such that a PWM mode in which pulse signals causing turn-on are provided by alternating at least some of a plurality of switches of the converter is operated, and controlling the converter such that a pulse skip mode in which at least some of pulse signals are omitted by intermittently providing the pulse signals causing turn-on to at least some of the plurality of switches of the converter is operated, wherein the converter operates in the pulse skip mode during an idle duration in which the ping signals are not transmitted, such that ripples of an input voltage of the inverter are reduced during a ping signal transmission duration so that the accuracy of signals received by the coil is increased, and power transmission efficiency under a light load condition can be increased during the idle duration.

The invention discloses a power output improvement circuit, method and chip for an LDO.The circuit comprises a first power MOS tube, a second adjusting MOS tube and a third auxiliary MOS tube which are arranged between a power source positive electrode and a power source negative electrode, the source electrode of the first power MOS tube is connected with the power source positive electrode, the drain electrode of the first power MOS tube is electrically connected with the source electrode of the second adjusting MOS tube, and the source electrode of the third adjusting MOS tube is electrically connected with the source electrode of the third auxiliary MOS tube; the drain electrode of the second adjusting MOS tube is electrically connected with the source electrode of the third auxiliary MOS tube, and the drain electrode of the third auxiliary MOS tube is electrically connected with the negative electrode of the power supply; a self-adaptive proportional control network is connected between the positive electrode of the power supply and the drain electrode of the second adjusting MOS tube, the self-adaptive proportional control network is further electrically connected with the grid electrode end of the first power MOS tube, and the second adjusting MOS tube can be controlled to work in a saturation region through the self-adaptive proportional control network after the load changes. Therefore, the power output can have enough loop gain under the conditions of light load and heavy load.

The application provides a virtual power plant frequency modulation and peak regulation method, comprising the following steps: acquiring a wind and light load prediction curve, market price prediction information and a power grid next-day peak regulation demand curve, establishing a first planning model to obtain each controllable resource base point power plan and energy storage SOC plan of each preset time period of the next day; after the next day, every preset time period is executed: acquiring short-term wind and light load prediction data, actual operation state of each resource and real-time market price information, establishing a second planning model to correct each controllable resource base point power plan and energy storage SOC plan of the current time period, and determining a frequency modulation parameter of the current time period; according to the corrected each controllable resource base point power plan and energy storage SOC plan of the current time period, instructing corresponding equipment to execute; if a power grid frequency modulation instruction is received, adjusting the output of the frequency modulation resource according to the frequency modulation parameter of the current time period. The method solves the limitation problem of the virtual power plant in frequency modulation and peak regulation.

The application provides a power supply driving circuit for inputting a wide voltage range, comprising a DC-DC wide voltage conversion module, a DC-AC conversion module, a light driving module and an atomization driving module, the DC-DC wide voltage conversion module is connected with a power input end, the output end of the DC-DC wide voltage conversion module is connected with the DC-AC conversion module, the DC-AC conversion module is connected with a light load through the light driving module, the DC-AC conversion module is connected with an atomization load through the atomization driving module, the input power supply is converted in voltage through the DC-DC conversion module and the DC-AC conversion module, the input power supply voltage is adjusted to the working voltage of the load, so that the light driving module drives the light load to work and the atomization driving module drives the atomization load to work. The power supply driving circuit for inputting a wide voltage range can be applied to a wide input voltage range, and can basically meet the required power supply voltage of household through the DC-DC wide voltage conversion module and the DC-AC conversion module, thereby solving the limitation of the input voltage.

The application discloses a kind of hybrid energy storage microgrid capacity configuration methods based on double-layer optimization decomposition, comprising the following steps: based on annual wind light load data extraction typical day, construct the double-layer optimization model of capacity configuration with minimum as target full life cycle cost;Inner layer uses intelligent hybrid algorithm to optimize variational mode decomposition parameter, and the power shortage signal is decomposed, and the adaptive distribution of high and low frequency power is realized by energy and frequency joint clustering, respectively by super capacitor and battery bear;Outer layer is based on the allocation scheme, and the capacity of wind light storage is globally optimized by using optimization solver, and finally the optimal configuration scheme of economy that meets operation constraint is output.The application realizes the full life cycle economic optimal configuration of microgrid under the condition of meeting reliable operation constraint by constructing the capacity configuration optimization model of inner and outer layer coupling, combining signal decomposition parameter adaptive optimization algorithm and objectively distributing hybrid energy storage output according to energy and frequency characteristics.

The application provides a control circuit used in a GaN-driven power switching power supply system, which is configured to: in the case that the GaN-driven power switching power supply system is in a light load mode, control a first power supply path control switch to be in an off state, and based on a power supply voltage on a power supply capacitor and a first power switch control signal used for controlling the turn-on and turn-off of a GaN power switch, generate a second path switch control signal used for controlling the turn-on and turn-off of a second power supply path control switch and a second power switch control signal used for controlling the turn-on and turn-off of a power drive switch; or in the case that the GaN-driven power switching power supply system is in a non-light load mode, control the second power supply path control switch to be in an off state, and based on the power supply voltage on the power supply capacitor and the first power switch control signal, generate a first path switch control signal used for controlling the turn-on and turn-off of the first power supply path control switch and the second power switch control signal.

This application relates to a power supply control method, a resonant converter system, and an energy storage system. The method includes: when the current operating conditions are undervoltage and light load, undervoltage and heavy load, or overvoltage and light load, stabilizing the supply voltage of the auxiliary power supply winding by adjusting the duty cycle of the switching transistor in the resonant circuit; when the current operating conditions are overvoltage and heavy load, determining the switching time of the voltage output value from the overvoltage region to the undervoltage region based on the width of the hysteresis region and the inverter's load rate, to stabilize the supply voltage of the auxiliary power supply winding; when the current operating conditions are in other conditions where the voltage range is the hysteresis region, executing the same supply voltage stabilization strategy as the target range, where the target range is the voltage range corresponding to the voltage range before entering other operating conditions. Using this application, the output voltage of the auxiliary power supply winding can be stabilized to ensure the normal operation of the electrical load powered by the auxiliary power supply circuit.

The utility model belongs to the technical field of multi-shaft motor motion structures, and relates to a multi-shaft linkage symmetrical light load motor motion structure and a workbench. The first end rotating shaft is rotationally connected with a first power plate and is in transmission connection with a first motor; the second cross beam is positioned above the first cross beam to form a cross structure or a cross parallel structure; second end rotating shafts are arranged at the two ends of the second cross beam; the second end rotating shaft is rotationally connected with a second power plate and is in transmission connection with a second motor; the first cross beam and the second cross beam are oppositely arranged, the movement connecting seat is arranged between the first cross beam and the second cross beam in a sliding mode, and the first cross beam and the second cross beam respectively drive the movement connecting seat to move along a first direction shaft or a second direction shaft. The motion load of the first motor and the second motor is effectively reduced, and the response speed of the motors during operation is improved.

The application belongs to the technical field of off-grid inverters and battery management, and particularly relates to a kind of off-grid inverter battery protection and charging control method and system based on impedance detection, wherein battery input parameters under two different load conditions of no-load or light load and load are collected;The corresponding relationship model of the preset lithium battery remaining capacity SOC and the battery internal resistance is obtained by using Ohm's law analytical algorithm, the current actual internal resistance of the battery is obtained, the preset SOC-internal resistance corresponding relationship model is input, and the current SOC value of the battery is obtained by back calculation;The inverter charging current regulation threshold is set in stages, and the multi-dimensional risk early warning threshold is set in stages;When the monitoring value exceeds the corresponding set risk early warning threshold, the corresponding level risk early warning signal and the matching disposal action are triggered, and the whole process management and control of battery state real-time monitoring, charging current adaptive regulation and risk early warning are carried out. Thus, the problems of short service life of battery, poor charging safety and the like in the prior art are solved.

The invention discloses a control method of a multi-level Buck-Boost converter, which belongs to the technical field of power converters, and can realize soft switching of all switching tubes and minimization of inductive current pulsation and effective value by reasonably utilizing each control degree of freedom of the converter and controlling inductive current into a pentagonal form. And an optimal working mode is adopted, and the rising and falling slopes of the inductive current are adjusted in a pseudo inductive current discontinuous mode, so that the circulation time of the negative current is reduced, and the light load efficiency of the converter is improved.

This invention discloses a composite control method for an LLC resonant converter to improve efficiency under light load conditions. The method includes: subtracting the output voltage of the LLC resonant converter from first and second voltage reference values, and then performing PI processing to obtain first and second judgment data; when the first judgment data is greater than a first minimum threshold value, PFM control is applied to the LLC resonant converter; when the first judgment data is less than or equal to the first minimum threshold value, PWM control is initiated, and simultaneously, the second judgment data is compared with the second minimum threshold value. When the second judgment data is greater than the second minimum threshold value, the switches in the LLC resonant converter remain on; when the second judgment data is less than or equal to the second minimum threshold value, all switches are turned off. This invention employs different control schemes in stages according to load changes, enabling soft switching across the entire operating range, narrow frequency range adjustment, and small-range duty cycle variation, thereby improving efficiency under light load conditions.

The invention provides a totem pole PFC converter adaptive ZVS and frequency reduction cooperative modulation method and system, and the method comprises the steps: collecting an input voltage, an output voltage and a zero current detection ZCD signal in real time, outputting the conduction time of a main switching tube through a digital compensator, and predicting the current switching frequency based on an inductive current waveform; comparing the magnitude relationship between the input voltage and the output voltage, and selecting a modulation mode; calculating the number of resonance cycles according to a preset switching frequency upper limit; according to the selected modulation mode, key time parameters are calculated in a self-adaptive mode according to the different modulation modes: a wave sending module in the digital controller updates a PWM signal sequence according to the selected modulation mode and the calculated time parameters, the on-off time sequence of a switch tube is dynamically controlled, and the switch frequency limitation and ZVS collaborative optimization under the light load condition are achieved. Two modulation modes in the frequency reduction cooperative modulation method can reliably realize ZVS while limiting the switching frequency, the switching loss is reduced, and the method has universality and economical efficiency at the same time.