389 results about "Power cycle" patented technology

The invention relates to the technical field of semiconductor device testing, in particular to a SiC MOSFET power cycle testing method which comprises the following steps: S1, building a composite environment testing platform, configuring dynamic testing parameters, automatically calculating a physical boundary and collecting sensor data in real time; s2, establishing a finite element simulation model based on the physical boundary and sensor data, and outputting optimized dynamic test parameters and a simulated stress distribution diagram; s3, synchronously applying composite stress according to the dynamic test parameters and the stress distribution diagram, and collecting multi-dimensional test data in real time; when the system is used, through dynamic boundary calculation and real-time data acquisition, the intelligent degree and reliability of the test are improved, the test period is shortened, the failure prediction accuracy is improved, the system is suitable for reliability evaluation of SiC MOSFET devices in the fields of new energy, aerospace and the like, a large number of physical tests are avoided through virtual simulation, and the reliability of the SiC MOSFET devices is improved. And reduction of device loss and resource waste is facilitated.

The invention discloses a Carnot battery system based on phase change cold storage and energy storage and a multi-mode operation method thereof, the Carnot battery system comprises a vapor compression refrigeration unit, a phase change cold storage device and a power cycle unit, in a charging stage, the vapor compression refrigeration unit is adopted to generate cold energy by using off-peak power; in the energy storage stage, cold energy prepared by the steam compression refrigeration unit is stored in a high-density mode through the phase change cold storage device; in the discharging stage, the stored cold energy serves as a cold source, external low-temperature waste heat serves as a heat source, a power circulation unit is adopted, meanwhile, the cold energy and the hot energy are utilized for heat-work conversion, and electric energy is released; according to the Carnot battery system provided by the invention, the round-trip efficiency and the energy storage density of an energy storage system can be improved, the energy storage cost is reduced, and large-scale long-time energy storage is facilitated; according to the multi-mode operation method provided by the invention, through dispatching application of the phase change cold storage device and the charge-discharge cycle, different types of low-temperature heat sources can be fully utilized, and the cold electricity energy consumption requirement of a user side is met.

The present application provides a method and system for predicting the remaining service life of an IGBT device, comprising: simulating an IGBT device power cycle aging experiment, collecting conduction voltage drop historical data on the basis of the experiment, and respectively obtaining a model parameter empirical value and a model parameter estimated value on the basis of the conduction voltage drop historical data; constructing a first state weight on the basis of the current operation state, and performing smooth adjustment on the model parameter estimated value on the basis of the model parameter empirical value and the first state weight to obtain a parameter correction result; and establishing a state transition equation on the basis of the parameter correction result, and predicting the remaining service life of an IGBT device on the basis of the state transition equation. Use of the present application can improve the accuracy of prediction of the remaining service life of the IGBT device.

A liquid cooling data center waste heat driven Carnot battery comprises a data center liquid cooling loop, a heat pump circulation loop, a heat storage unit, a power circulation loop and a cooling water loop. The data center liquid cooling loop exchanges heat with the server through the liquid cooling technology to absorb waste heat of the data center, and cooling and heat transfer of the data center are achieved. In the charging process, the system utilizes off-peak electricity or renewable energy electricity to drive a heat pump circulation loop, the temperature of waste heat is increased, and the waste heat is stored in a high-temperature water tank; in the peak period of electricity utilization, the power circulation loop converts high-temperature heat energy stored in the high-temperature water tank and heat energy of cooling liquid in liquid cooling circulation of the data center into electric energy through the high-temperature heater and the low-temperature heater, and therefore energy is supplied to the data center. According to the system, the waste heat of the liquid cooling data center is utilized in the charging and discharging process, so that the recovery efficiency of the waste heat of the data center is improved, and the back-and-forth efficiency of the Carnot battery is also improved.

The invention discloses a detection method, a control device, a distribution box and a storage medium. The detection method is used for the distribution box. The detection method comprises the following steps: acquiring a real-time input alternating-current voltage and a zero-point alternating-current phase of the distribution box in a mains supply period; acquiring an analog input AC voltage of the distribution box in the commercial power period according to the zero AC phase; determining that the real-time input AC voltage is normal under the condition that the AC voltage difference between the analog input AC voltage and the real-time input AC voltage is smaller than or equal to a preset threshold value; and when the AC voltage difference between the analog input AC voltage and the real-time input AC voltage is greater than a preset threshold, determining that the real-time input AC voltage is abnormal. Whether the real-time input alternating voltage of the distribution box is normal or not is determined by detecting the alternating voltage difference between the real-time input alternating voltage and the analog input alternating voltage in a mains supply period, interference of an X capacitor arranged between a zero line and a live line can be reduced, and therefore the switching speed is increased to a certain degree.

Described are techniques for write protecting a non-volatile memory (NVM) after the contents of the NVM have been set. In some examples, a computing device or system having an NVM also includes a Root of Trust (RoT) configured to generate a write protect command as an input to the NVM. The RoT generates the write protect command in response to detecting a write protect signal from an electronic controller. The write protect command sets one or more areas in the NVM to be read-only. Further, the write protect command can make the one or more areas read-only on a power-on basis so that write protection is maintained until the next power cycle. The electronic controller can be configured to assert the write protect signal each time the computing device or system is powered on, for instance during a reboot, thereby causing the RoT to renew the write protection.

A refrigeration cycle is connected to a supercritical carbon dioxide (sCO2) power cycle by incorporating a CO2 condenser which is also the refrigeration cycle evaporator. The heat rejected by the carbon dioxide is absorbed by the refrigerant in the CO2 condenser. Work is done on the refrigerant to raise its temperature above the local ambient temperature. The heat absorbed from the power cycle and the work required to raise the refrigerant temperature is rejected to the ambient environment, which may be either air, earth, or water. This results in improved efficiencies in carbon dioxide power cycles without regard to the ambient temperature by forcing a transcritical phase change even when ambient temperatures are above the carbon dioxide critical point. A two-phase heat transfer on both sides of the CO2 condenser further improves efficiency of the sCO2 power cycle.

Provided are a detection method, a control device, a power distribution box, and a storage medium. The detection method applied in a power distribution box includes: obtaining a real-time input alternating-current voltage and a zero-point alternating-current phase of the power distribution box within a utility power cycle; obtaining a simulated input alternating-current voltage of the power distribution box within the utility power cycle based on the zero-point alternating-current phase; determining that the real-time input alternating-current voltage is normal in response to an alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being smaller than or equal to a predetermined threshold, or determining that the real-time input alternating-current voltage is abnormal in response to the alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being greater than the predetermined threshold.

The invention discloses a gas turbine TCA / FGH large temperature difference driven S-CO2 power cycle system which comprises a gas compressor, a combustion chamber, a gas turbine, a TCA heat exchanger, an FGH heat exchanger, an S-CO2 compressor and an S-CO2 turbine, a hot side inlet and outlet of the TCA heat exchanger is connected with a hot air pipeline, the cold side of the TCA heat exchanger is connected with an S-CO2 working medium circulating device, the hot side of the FGH heat exchanger is connected with the S-CO2 working medium circulating device, and the hot side of the FGH heat exchanger is connected with the S-CO2 working medium circulating device. The cold side of the TCA heat exchanger is connected with a cold natural gas pipeline, the hot side of the TCA heat exchanger absorbs heat of high-temperature air, the air temperature is reduced to a set value, meanwhile, supercritical carbon dioxide after pressure boosting is heated, an S-CO2 turbine is pushed to do work, and natural gas is heated to the set temperature in the FGH heat exchanger. The TCA / FGH temperature difference condition is utilized, the S-CO2 power cycle is driven to output extra electric energy, the peak regulation capacity of the unit is improved, and meanwhile the problem of TCA / FGH heat imbalance is solved.

The invention discloses a GaN device power cycle failure prediction method based on a long short-term memory network, and the method comprises the steps: firstly collecting a power cycle dynamic parameter of a GaN device, then carrying out the preprocessing of the power cycle dynamic parameter of the GaN device, obtaining the preprocessing data, constructing a multi-dimensional time sequence input feature tensor according to the preprocessing data, and carrying out the prediction of the power cycle failure of the GaN device. The method comprises the following steps of: inputting a multi-dimensional time sequence input feature tensor into a GaN device, optimizing a long-short-term memory network to obtain a power cycle failure prediction model, inputting the multi-dimensional time sequence input feature tensor into the power cycle failure prediction model, performing power cycle failure prediction on the GaN device, and adaptively updating the power cycle failure prediction model. According to the method, the power cycle test of the GaN device can be terminated in advance through failure prediction, the data requirement of the target working condition is reduced, and the overall test time is shortened.

Methods, systems, and devices for memory row-hammer mitigation are described. A memory device may operate based on a scheme that is continuous across power cycles. For example, the memory device may access a region if a value of a counter does not satisfy a threshold value and may access the region if a value of the counter satisfies the threshold value. Upon transitioning power states, the value of the counter may be stored to a non-volatile memory such that it may be accessed when transitioning back to the original power state (e.g., an “ON” state). Accordingly, the value of the counter may be maintained across power cycles.

The invention belongs to the technical field of comprehensive energy utilization, and relates to a multi-energy cogeneration carbon dioxide power cycle system and a method thereof. The multi-energy cogeneration carbon dioxide power cycle system comprises a gas storage bin, a first compressor, a first cooler, a liquid storage tank, a first turbine, a rear preheater, a hot water supply unit, a waste heat recovery unit and a cold energy recovery unit. The hot water supply unit supplies hot water to absorb heat generated by multi-stage compression of carbon dioxide to obtain steam, so that the steam is supplied to a user, and the waste heat recovery unit and the hot water supply unit are matched to absorb and store the waste heat of the system to heat the carbon dioxide after expansion acting. And then the cold energy recovery unit is used for recovering the cold energy in the carbon dioxide subjected to expansion acting so as to supply cold water to a user or make ice, so that the waste heat and the cold energy in the power circulation process can be recovered, steam and the cold energy including electric energy are output, the energy consumption of the system is reduced, and the energy utilization efficiency of the system is also improved.

The invention relates to the technical field of semiconductors, in particular to a silica gel packaging power module of a novel chip bonding point reinforcing process scheme. Comprising a chip; the back surface of the chip is arranged in a conductive copper layer power circuit etching region of the insulating ceramic substrate, and the front surface of the chip is connected to the conductive copper layer power circuit etching region of the insulating ceramic substrate through a bonding wire to form a power loop; and the reinforcing layer is arranged on the bonding points on the front surface of the chip. According to the invention, the bonding point is coated with the reinforcing layer, and the bonding point is cured and reinforced, so that in a power cycle reliability tolerance experiment with higher chip junction temperature and larger temperature change, the bonding point is less deformed under the constraint of the reinforcing layer and is subjected to relatively small stress, and the bonding and binding with the chip are less prone to failure. Therefore, the application of higher junction temperature resistance of the module can be improved, the power cycle or temperature cycle resistance of the bonding and binding process is higher, and the reliability of the module is improved.

Devices and methods for managing boot personalities in a network device are disclosed. The method includes, after powering on the network device, a programmable component of the network device outputting a first signal unique to a first boot personality. One or more switches are toggled based on the first signal. The toggling results in connecting at least one of one or more first components in the network device associated with the first boot personality and disconnecting at least one of one or more second components in the network device associated with a second boot personality.

The invention discloses a comprehensive aging stress test system and method for a GaN power device, and aims to meet various test requirements of the GaN power device on one platform. The system comprises an upper computer module, a central control system, a main circuit module, a power supply module, an oscilloscope, a temperature control module and a tested device slot. The central control system stores a plurality of test programs, such as high-temperature reverse bias, high-temperature gate bias and a power cycle mode. The upper computer module communicates with the central control system through an I / O interface and sends a control command. And after receiving the command, the central control system controls the temperature control module, the power supply module and the main circuit module. The power supply module is connected with the main circuit module, the main circuit module is connected with the oscilloscope, the temperature control module is connected with the tested device slot, and the tested device slot is connected with the main circuit module.

The invention belongs to the field of reliability of components, and particularly discloses an online extraction method and system for power cycle characteristic parameters of a SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor). According to the invention, the characteristic parameter information of the device, including the conduction voltage drop, the drain current, the Miller plateau voltage and the device temperature, is acquired in real time, the threshold voltage is calculated through the extracted Miller plateau voltage and the drain current, and the SiC MOSFET power cycle degradation parameter fitting model is established, so that reliability analysis and life estimation can be more accurately carried out on the SiC MOSFET power cycle degradation parameter fitting model. The method can be used for reliability research of SiC MOSFETs of different models and service life estimation based on data driving.

A method for heat integration between a chemical synthesis plant that runs an exothermic reaction and (ii) and a partner plant that generates a working fluid such as steam (e.g., runs a power cycle). The present disclosure describes both internal and external heat integration. Internal heat integration may provide heat from the exothermic reaction (e.g., from methanol synthesis) to a reboiler associated with a distillation column of the chemical synthesis plant. External heat integration may use heat from the exothermic reaction to preheat a condensed water stream (which stream is downstream from the turbine and condenser of the power cycle). Such reduces the need for bleed off the turbine to preheat condensed water as part of the power cycle. A bleed off the turbine provides heat to the reboiler associated with the distillation column of the chemical synthesis plant. Heat integration provides overall improved energy use within both plants.

A method for detecting a partial discharge in electric power equipment is disclosed. Two or more narrowband signals corresponding to respective frequency bands of the partial discharge are obtained by two or more receivers, and a temporal coincidence of the two or more narrowband signals is detected, thereby indicating a possible presence of the partial discharge. Then a synchronous recurrence of the partial discharge over a plurality of power cycles is determined, thereby validating the possible presence of the partial discharge. A corresponding system is also provided.

The invention provides a supercritical carbon dioxide power generation working medium pressure adjusting system, belongs to the technical field of power generation system working medium pressure adjusting, and can at least partially solve the problems that in the existing unit start-stop and load adjusting process, the system pressure is greatly changed, normal operation of a unit is affected, and the working efficiency is low. The system comprises a power generation module, and the power generation module comprises a compressor and a heat regenerator connected with the compressor through a pipeline; the carbon dioxide working medium circulating system is provided with the gas storage tank, part of the carbon dioxide working medium is stored in the gas storage tank through the differential pressure of the high-pressure part and the low-pressure part of the circulating system, the working quality of the circulating system is adjusted, and the carbon dioxide working medium circulating system has the advantages of being simple and convenient to operate.

The invention provides a stepped energy storage system which comprises a power cycle unit, a high-temperature energy storage unit, a low-temperature energy storage unit, a high-temperature heater, a low-temperature heater and a control unit and is divided into two operation stages including an energy storage mode and an energy release mode. According to the system, the low-temperature energy storage system and the high-temperature energy storage system are combined to achieve stepped energy storage, and through cooperation with the intelligent control unit and the power circulation unit, the system can be flexibly switched between an energy storage mode and an energy release mode, so that the power requirements under different working conditions are accurately responded, and the power supply efficiency is improved. And the # imgabs0 # loss of the high-grade heat energy in the transfer process is reduced.

The invention provides an IGBT module junction temperature monitoring method and device, and belongs to the technical field of power electronic devices. The method comprises the following steps: acquiring a collector-emitter saturation voltage drop, a direct current power cycle period number and a shell temperature of an on-line IGBT (Insulated Gate Bipolar Translator) module; inputting the collector-emitter saturation voltage drop, the direct current power cycle period number and the shell temperature into a pre-trained junction temperature monitoring model to obtain the junction temperature of the on-line IGBT module; wherein the junction temperature monitoring model is obtained by training a whale optimized gradient elevator model based on a pre-constructed data set, and the pre-constructed data set is obtained according to aging data; the aging data comprises the direct-current power cycle aging period number of the IGBT module, the aging shell temperature of the IGBT module, the precise junction temperature of the IGBT module and the collector-emitter saturation voltage drop of the IGBT module. According to the invention, the junction temperature of the IGBT module can be monitored on line.

The invention discloses a semiconductor device power cycle and high-temperature reverse bias coupling test method and system, and relates to the field of semiconductor device tests.The method comprises the steps that test conditions are set, and a first parameter is obtained; based on the first parameter, setting a switching period of the high-temperature reverse bias test and the power cycle test, and setting an initial state; performing first judgment on the cycle index of the to-be-tested device based on the initial state; selecting to carry out a power cycle test or a high-temperature reverse bias test based on a result of the first judgment; after aging failure of the device is detected in the power cycle test or the high-temperature reverse bias test or all preset test periods are completed, the test is ended; according to the invention, a complete power cycle test can be carried out on the device, a high-temperature reverse bias test can be carried out on the tested device while the power cycle test is carried out on other test branches, and the coupling test of power cycle and high-temperature reverse bias of the semiconductor device is realized.

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 relates to a gas turbine unit electric energy supply system coupled with electricity storage and sCO2 circulation and a dispatching method, and belongs to the technical field of electric power. The system comprises a non-dispatchable electric energy system and a dispatchable electric energy system, the dispatchable electric energy system comprises a gas turbine power generation system, an sCO2 power cycle power generation system, an electricity storage device and a water electrolysis hydrogen production device, and the input end of the electricity storage device and the input end of the water electrolysis hydrogen production device are connected with the non-dispatchable electric energy system through a controller A; the output end of the electricity storage device, the gas turbine power generation system and the sCO2 power cycle power generation system are connected with a power grid through a controller B. The output end of the water electrolysis hydrogen production device is connected with a hydrogen storage tank, the gas turbine power generation system, the sCO2 power cycle power generation system and the undispatchable electric energy system are connected with the power grid. According to the invention, the impact of the randomness and volatility of new energy power generation such as wind and light on the power grid is solved, the peak regulation capability of the power system is improved, and the power supply quality and operation safety of the power grid are guaranteed.

The invention provides an operation method of an S-CO2 power cycle system driven by waste heat, which belongs to the field of waste heat utilization and power generation and comprises the following steps: CO2 filling: filling a system working medium into a storage tank through an injection pipeline; the system is started and runs under variable working conditions, the environment temperature is lower than the normal working temperature, the cooling water flow is adjusted, liquid CO2 is formed at an output port of a cooler and separated into a storage tank, when the load needs to be increased, a waste heat valve of a waste heat pipeline is opened, the CO2 flow is increased, and when the load needs to be reduced, the waste heat valve of the waste heat pipeline is opened, the CO2 flow is reduced, and the CO2 flow is reduced. Storage tank cold tracing keeps the inlet pressure of the first compressor constant; when the environment temperature is low, the cooling water flow is adjusted, and then the system temperature, pressure and flow are rapidly adjusted, so that CO2 at an inlet of the compressor is effectively prevented from being in a liquid state, and rapid response of the system under variable working conditions is achieved.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. In one application, the energy storage system provides higher-temperature heat to a conventional lower-temperature heat source to boost the temperature of a thermal power cycle working fluid to a turbine, thereby increasing efficiency of the power cycle.

The invention relates to the technical field of power cycle tests, in particular to a test method for automatically interspersing static characteristic tests in a power cycle test, which comprises the following steps of: 1, performing a power cycle test on a tested sample, and judging the aging degree; counting the cycle number of the power cycle test; 2, judging whether the cycle number of the power cycle test reaches a preset value N or not, if yes, pausing the power cycle test, waiting for state recovery, and executing the step 3; if not, continuing to execute the step 1; 3, stopping the power cycle test, and entering a static parameter test; 4, all interspersed static parameter tests are finished, a power cycle test is recovered, and an interspersed transient thermal test is carried out; 5, judging whether a stop condition is triggered or not, and if yes, executing the step 6; if not, executing the step 1; and step 6, ending the loop test. Static parameter testing can be interspersed in power cycle testing, and the overall reliability of the tested sample is improved.

A test method and apparatus for bipolar degradation of a diode, and a device. The method comprises: respectively performing static characteristic tests on a first diode and a second diode, so as to obtain a first static characteristic test result and a second static characteristic test result; setting a pulse test current, a pulse test time and a pulse cycle time, so that, on the basis of the pulse test current, the pulse test time and the pulse cycle time, a power semiconductor pulse current test device performs repeated short pulse current power cycle tests on the first diode under normal temperature conditions, and performs repeated short pulse current power cycle tests on the second diode under high temperature conditions; then, performing static tests, so as to obtain a plurality of static characteristic test results; and on the basis of the static characteristic test results, obtaining a bipolar degradation test result of a diode. By means of the method, bipolar degradation of the diode is tested, and the accuracy and reliability of the test result are improved.

The embodiment of the invention discloses a power cycle test tool structure, a manufacturing method and a power module test method. The structure comprises a radiator which comprises a device placing part, a first connecting part and a second connecting part; the device placing part is used for placing a three-phase full-bridge power module; the wiring conductive block is provided with a third mounting hole and a power terminal connecting hole, and the power terminal connecting hole is used for connecting a wiring terminal of the three-phase full-bridge power module; the first insulating plate is fixed on the first connecting part and is provided with a plurality of first mounting holes; the second insulating plate is fixed on the second connecting part and is provided with a plurality of second mounting holes; the two wiring conductive blocks are fixed on the first insulating plate through at least one first mounting hole; and / or the two wiring conductive blocks are fixed on the second insulating plate through at least one second mounting hole. According to the technical scheme, the manufacturing cost of the power cycle test packaging structure is reduced, and the compatibility is improved.

The invention relates to the technical field of power semiconductor devices, and discloses a power cycle test circuit and method for a SiC power semiconductor device, and the circuit is characterized in that the AC side of a rectification circuit is connected with an AC power supply, and the DC side of the rectification circuit is connected with the first end of a DC boost circuit; the second end of the direct-current booster circuit is connected with the direct-current side of the inverter circuit; the alternating-current side of the inverter circuit is connected with an alternating-current power supply; part of power semiconductor devices in the rectifying circuit, the direct-current booster circuit and the inverter circuit are SiC power semiconductor devices to be tested. The active power cycle test circuit comprises a rectification circuit, a direct current boost circuit and an inversion circuit which are connected in series. The AC power supply provides energy for the test circuit. No load exists in the test loop, a power circulation loop is formed, and a circuit is provided for characteristic test of the SiC power semiconductor device. In the working process of the circuit, the power supply loop only needs to provide loss energy of the test loop.