138 results about "Pulse load" patented technology

A power circuit for protecting against high pulse load current and inrush current is disclosed. The power circuit comprises a buck-boost module and a PFC controller operatively coupled with the buck-boost module. The PFC controller is configured to receive an input voltage feedback, an output voltage feedback, and a current feedback, and is configured to utilize one of an Integral Gain Compensation (IGC) and an Integral Value Compensation (IVC) to control the high pulse load current and inrush current in the power circuit.

A HESS and method of controlling a HESS is provided. The HESS may comprise a common DC bus having a DC bus voltage, an energy storage device electrically coupled to the common DC bus, a power device electrically coupled to the common DC bus, and a controller in operable communication with the energy storage device, the power device and the common DC bus. The controller may be configured to, when the energy storage device is charging, increase a power device charging current if an energy storage device charging current is greater than a charging limit for the energy storage device, and when the energy storage device is discharging, increase a power device discharging current if an energy storage device discharging current is greater than a discharging limit for the energy storage device. The HESS may be part of a power system.

A power supply (1) for a pulsed load (2) includes a first energy storage device in the form of a battery (3) which is in parallel with a second energy storage device in the form of a supercapacitor (4) Battery (3) and supercapacitor (4) are respectively modelled as: an ideal battery (7) in series with an internal resistance (8); and an ideal capacitor (9) in series with an equivalent series resistance (ESR) (10). Through use of a supercapacitor (4) having a low ESR with respect to the resistance (8), the power supply (1) facilitates continuity of supply to load (2). That is, during peak demand more of the load current will be supplied by supercapacitor (4) due to the lower ESR. Moreover, during times of lower load current demands the battery recharges the supercapacitor. This reduces the peak current needed to be provided by the battery and thereby improves battery longevity.

The invention discloses a dynamic monitoring test apparatus for propagation of fractures from triaxial pulse loading hydraulic fracturing and relates to physical simulation experimental system platforms for transfer pressure monitoring for fractures from triaxial hydraulic fracturing, development of fractures, and study on propagation law. The apparatus of the invention mainly comprises a liquid injection control system, a triaxial stress loading system, an intra-fracture water pressure monitoring system and an acoustic emission three-dimensional dynamic monitoring system. The apparatus has the advantages that various fracturing liquid systems under different pressures and frequencies can be injected to arrive at reservoir hydraulic fracturing under simulated triaxial stress state of different reservoirs; the functions of triaxial servo loading, real-time fracture transfer pressure monitoring and fracture three-dimensional evolution are achieved in the test process, and a study platform is provided for studying triaxial hydraulic fracturing of reservoirs; the apparatus is simple to operate, high in intelligence level and compact in structure and can provide good studies on the fracture damage mechanism of rock during hydraulic fracturing of reservoirs.

The invention discloses a distributed power distribution method for a fuel battery-super capacitor hybrid power supply system. The method comprises the steps of S1, building the fuel battery-super capacitor hybrid power supply system; S2, designing a controller to control the fuel battery-super capacitor hybrid power supply system; and S3, setting a control parameter for the fuel battery-super capacitor hybrid power supply system so as to achieve distributed dynamic power distribution. The distributed power distribution method for the fuel battery-super capacitor hybrid power supply system provided by the invention can achieve dynamic optimized distribution of pulse load power of the fuel battery-super capacitor hybrid power supply system among different power supply units, high frequency power pulse is provided by the super capacitor, and low frequency graded power is provided by the fuel battery; furthermore, automatic recovery of the bus voltage and the charge state of the super capacitor can also be achieved under a steady state. In addition, overcharging and overdischarging protection of the super capacitor can also be achieved to ensure that the super capacitor works in a normal working area.

The present invention relates to an apparatus and a method for protecting an electric line in a vehicle, it being possible to adapt the apparatus to the properties of the electric line to be protected. The apparatus for protecting an electric line comprises an electric fuse and a controllable switching element, the controllable switching element and the electric fuse being formed as a parallel circuit, and the parallel circuit being connectable in series to the electric line, the electric fuse being disposed in a first branch of the parallel circuit, which has a first resistance, and the controllable switching element being disposed in a second branch of the parallel circuit, and the controllable switching element being configured to accommodate at least two states, a first state with a second resistance higher than the first resistance, and a second state with a third resistance lower than the first resistance, and to switch into the second state when there is a pulse load condition.

A controlled power supply comprising: a) an array of low voltage current sources; b) a plurality of switch power supplies coupled to each of the storage capacitors and respective ones of the pulse loads being coupled to each of the switch power supplies; c) each of the storage capacitors being configured for storing energy during an inactive portion of a load switching cycle of the respective switch power supply to which the corresponding storage capacitor is coupled when the pulse loads are inactive; d) a respective output capacitor in association with each of the switch power supplies for feeding voltage to the respective pulse loads during an active portion of the load switching cycle; and e) the respective storage capacitor being configured for supplying the stored energy via the respective to the respective switch power supply to which the storage capacitor is coupled to each of the pulse loads coupled to switch power supply during an active portion of the load switching cycle.

The invention discloses a device and method for enhancing a coal seam fracturing effect. The device comprises four parts, namely, a connecting rod, a connecting sleeve, an expandable sleeve and a constant-pressure switch; a drilling site is arranged according to a full mechanized mining face and coal seam occurrence conditions, all parts are assembled into a system in sequence according to a figure 1 based on drilling site parameters and the coal seam occurrence conditions, the system is arranged between two hole packers and is connected with a water injection pipe, and then, a high-pressure water injection fracturing process is started. According to the device, the number of hole wall cracks can be increased, the device can be used for changing hydrostatic pressure into pulse loads for injected high-pressure water, so that the crushing degree of rocks is enhanced, the crack density is increased, and the hydrostatic pressure can be used for increasing the lengths of the cracks. The invention aims to increase the air permeability of the coal seam, solve the problem of difficult drainage in low-air-permeability coal seams, and increase the gas drainage rate of the coal seams. The device has the advantages of simplicity, clear concept and convenience in operation.

A pulsed power source minimizes current ripple disturbance in a main power supply by dividing the pulsed load into a plurality of pulsed sub-loads. The pulsed power source includes a plurality of pulsed load power supplies, each pulsed load power supply receiving charging power from the main power supply and providing pulsed energy to one of the plurality of pulsed sub-loads. Pulsed energy delivered to each of the plurality of pulsed sub-loads is out of phase with the other pulsed sub-loads, resulting in the input current provided by the main power supply having a reduced current ripple magnitude and increased current ripple frequency.

The invention discloses an explosive loading continuous multi-pulse-load loading experiment device which comprises an upper impact column, buffer cushions, a sleeve, a middle impact column, a sample, a lower impact column and a sensor. The upper impact column is a steel solid cylinder provided with two annular supports, and is connected with the large-inner-diameter end of the sleeve. The sleeve is a cylinder with a step through hole machined inside. The small-inner-diameter part of the sleeve is sequentially provided with the buffer cushions, the middle impact column, the sample and the lower impact column. The three buffer cushions are located at the end of the sleeve, the diameter-changing position of the step hole of the sleeve and between the upper impact column and the middle impact column respectively. The middle impact column, the sample and the lower impact column are cylinders and have the outer diameters the same as the inner diameter of the sleeve. The end, away from the upper impact column, of the lower impact column is provided with the steel cylindrical sensor. By means of the explosive loading continuous multi-pulse-load loading experiment device, continuous multi-pulse-load loading can be conducted for explosive loading, all pulse load stress peak values and loading time can be effectively controlled, the service environment where layer targets are built up during explosive loading in the payload can be more vividly simulated, and then the overload resistance safety of the device is evaluated scientifically.

Methods and systems to translate a pulse power demand of a pulse load to a constant power draw, and to maintain a desired peak output voltage over time. A power converter (PC) provides power from a power source to a charge store, which provides pulse power to the load. A PC controller continuously monitors an output current of the PC and an output voltage of the charge store, and controls the PC to draw constant power from the source, at a level indicated by a power command. A peak voltage controller periodically adjusts the power command, such as to compensate for time-varying effects, based on a peak voltage reference and the output voltage of the charge store measured at times of synchronization pulses. The peak voltage controller generates the synchronization pulses based on rising edges of a pulse current, or receives the synchronization pulses from the radar system controller.

The organic electrolyte cell that is suitable for application of direct current backup of pulse load with load width on the order of milliseconds and has higher backup capability than the conventional design is achieved by setting the product R·C of an impedance R (Ω) at 1 kHz and a capacity C (F) is in a range from 0.00002 to 0.05, and improving the balance of voltage drop during discharge over a specified load width on the order of milliseconds.

The invention discloses a spacecraft power system based on superconducting magnetic energy storage and a control method. The spacecraft power system comprises a solar cell array, a power control unit, an energy bi-directional flowing converter, a logic and control unit, and a superconducting coil. The power control unit adjust output voltage of the solar cell array, to generate stable primary bus voltage. A variable acquisition and processing module in the logic and control unit acquires the primary bus voltage and processes the primary bus voltage. After processing, the logic and control unit performs logic determination on obtained variables, and a pulse generation, driving, and protection circuit module generates a corresponding pulse signal according to logic determination result. The pulse signal controls the energy bi-directional flowing converter. The energy bi-directional flowing converter is used to realize a primary bus charging the superconducting coil, the superconducting coil discharging to the primary bus, or a freewheeling function of the superconducting coil. The spacecraft power system solves problems that a conventional space power system cannot supply power for large power pulse loads.

The invention provides a high-power-density high-pulse load power supply platform which is based on an integrated power supply controller bus framework. The platform includes an integrated power supply controller, a solar cell array, a storage battery, a bus, an MPPT module, a wired energy transmission module and a wireless energy transmission module, a load and a super-capacitor charging/discharging CDDR module, the integrated power supply controller is realized by adopting a three-port converter, the three-port converter is connected with the solar cell array, a storage battery and a bus, the MPPT module is integrated in the integrated power supply controller; an 'Energy LAN' consisting of multiple solar array-battery DC power supply systems PBPS is connected with the bus via a wired grid-connected controller; the CDDR module is arranged between the online and pulsed load and used for charging and discharging the super capacitor through a bidirectional boosting and voltage reducing module, so that a small average power is input, and the larger peak pulse power is output.

A method for supplying bursts of substantially constant voltage to a switched load via a voltage reservoir. Based on a predetermined current that is to be sourced by the load during an active portion of a switching cycle, computing an average current that should be fed to the voltage reservoir during an inactive portion of the switching cycle to ensure that sufficient energy will stored in the voltage reservoir to supply the load without completely draining the voltage reservoir. Supplying continuous energy to the voltage reservoir at a substantially constant current equal in magnitude to said average current.

The invention discloses a high-power pulse load power device with rapid dynamic response and a control method thereof. Alternating current of a power supply source is rectified through a power matching network and converted into direct current, then, power is supplied to a pulse load, pulse load characteristics are eliminated through an energy storage capacitor, a super-capacitor, a two-way Buck/Boost converter and a control circuit thereof, the two-way converter and the super-capacitor are combined, and the problem of the power adaptability of the pulse load and the power source is solved. The device can be used for electronic countermeasures equipment with any changes of the load pulse frequency and power, and is applicable to any power supply system. The device has the advantages that the utilization rate of the power supply source is high, the adaptability is high, control is easy and reliable, and the transient response speed is high.

The invention relates to a load pulse loading device. The pin sample clamp of the device is fixed at one end of a dowel steel; the rod body of the dowel steel is assembled on the body of the loading device in a way of linear movement in the axis line direction; the body of the loading device which is arranged at the other end of the dowel steel is provided with a constant-load loading device; the load output head of the constant-load loading device is arranged on the end surface of the end; a flexible pulse generation mechanism is added on the constant-load loading device; the flexible pulse output of the flexible pulse generation mechanism is superposed with the load of the constant-load loading device and is subsequently exerted on the corresponding end surface of the dowel steel by the load output head of the constant-load loading device. The load pulse loading device of the invention follows the traditional mechanism-typed impact loading characteristics such as simple and easy realization, and easy control, etc., and reduces the noise generated by the impact loading by using the flexible loading characteristic of the spring.

The invention relates to an engineering machinery axle housing vertical bending fatigue test system. The engineering machinery axle housing vertical bending fatigue test system aims at overcoming the shortcomings that an axle housing in an existing test system is prone to damage, a high-intensity connection tool is needed in the testing process, and the testing working condition and the real working condition have difference. The test system comprises an axle housing sample piece, supports and hydraulic actuators, the hydraulic actuators are installed on a portal frame, the axle housing sample piece is horizontally and reversely arranged on the upper portions of the supports and is fixedly connected with the supports, and the hydraulic actuators exert pulse loads on the axle housing sample piece at the position of the wheel interval of the axle housing sample piece. According to the system, the tested axle housing sample piece is horizontally and reversely arranged, the supports are fixed on a test platform so that high intensity can be achieved and vehicle frames can be simulated really, a connection tool for simulating the vehicle frames in a traditional test system is not needed, the hydraulic actuators are connected with two crossed knuckle bearings to convey pulse loads, the free deformation movement of the sample piece is released to the maximum degree, the sample piece bears vertical and downward loads, and the actual load stress condition of an axle housing is simulated approximately.

The invention relates to a cable sheath fault monitoring device and method based on broadcast synchronization signals of multiple Rogowski coils. The method comprises the following steps of: 1, setting the primary-secondary transformation ratios of Rogowski coils in a grounding current acquisition sensor and a cable load acquisition sensor to be less than or equal to 1000: 1; 2, installing the grounding current acquisition sensor at the direct grounding position or the cross interconnection grounding position of each monitored line, and installing the cable load acquisition sensor on a cable body; 3, detecting a grounding current and a cable load current, respectively transmitting the grounding current and the cable load current to each monitoring host for signal processing, and transmitting the results to a server through a communication module; 4, when it is judged that a pulse load comes from the grounding circulation signal, enabling the hosts to broadcast control signals, and enabling all the monitoring hosts to collect the control signals at the same time within a preset time to make the synchronization error within 0.1 s; and 5, analyzing and processing the signals monitoredby the plurality of hosts, and predicting whether a fault occurs or not.

The invention relates to a super-capacitor configuration method adaptive to pulse load power fluctuation stabilization. The super-capacitor configuration method includes firstly acquiring industrial production pulse load data, and analyzing the characteristics of the pulse load to obtain typical daily pulse load impact sample data; secondly, determining relevant optimization goals and constraints of the pulse load stabilization; subjecting typical daily pulse load data frequency domain signals after time-frequency conversion to critical frequency search to obtain the critical frequency of the maximum impact limit; finally, considering the optimization goals and the constraints to determine the rated power, the rated capacity and the initial load capacity of an energy storage system of a super-capacitor. By configuring energy storage to alleviate the impact of the pulse load of the industrial production on the power grid, theoretical basis can be provided for the energy storage configuration of the super-capacitor of the pulse load.