A mixed-signal driver chip for a 132 × 64-pixel passive matrix OLED panel is presented. The chip has a 64-step gray scale control using the PWM method and two-step voltage pre-charge technology to pre-charge the ...A mixed-signal driver chip for a 132 × 64-pixel passive matrix OLED panel is presented. The chip has a 64-step gray scale control using the PWM method and two-step voltage pre-charge technology to pre-charge the OLED pixels. It consists of a digital controller,SRAM for display data memory,a DC-DC voltage converter,reference current generators,a pre-charge voltage generator,64 common drivers, and 132 segment drivers. The single chip is a typical current-drive circuit. It has been implemented in a Chartered 0.35/μm 18V HV （DDD） CMOS process with a die area of 10mm× 2mm. Test results show that the power consumption of the whole chip and all pixels with a constant driving current of 100μA while displaying the highest gray scale is 294mW with a 12V high voltage supply and a 3V low voltage supply.展开更多
In order to improve the drivability and energy efficiency of electric vehicle(EV),more and more batteries are connected in series with high voltage which makes it necessary to monitor the electric parameters of high v...In order to improve the drivability and energy efficiency of electric vehicle(EV),more and more batteries are connected in series with high voltage which makes it necessary to monitor the electric parameters of high voltage system(HVS)to ensure the high voltage safety.A high voltage safety management system is developed to solve this critical issue.Several key electric parameters including pre-charge,contact resistance,insulation resistance and remaining capacity are monitored and analyzed based on the presented equivalent models.An electronic unit called high voltage safety controller is developed.By the help of hardware-in-loop system,the equivalent models integrated in the high voltage safety controller are validated and the on-line electric parameters monitor strategy is discussed.The real vehicle experiment results indicate that the high voltage safety management system designed is suitable for EV application.展开更多
A design idea of fidelity sampling cylinder while drilling based on surface nitrogen precharging and supplemented by downhole pressurization was proposed, and the working mode and optimization method of sampling param...A design idea of fidelity sampling cylinder while drilling based on surface nitrogen precharging and supplemented by downhole pressurization was proposed, and the working mode and optimization method of sampling parameters were discussed. The nitrogen chamber in the sampling cylinder functions as an energy storage air cushion, which can supplement the pressure loss caused by temperature change in the sampling process to some extent. The downhole pressurization is to press the sample into the sample chamber as soon as possible, and further increase the pressure of sample to make up for the pressure that the nitrogen chamber cannot provide. Through the analysis of working mode of the sampling fidelity cylinder, the non-ideal gas state equation was used to deduce and calculate the optimal values of fidelity parameters such as pre-charged nitrogen pressure, downhole pressurization amount and sampling volume according to whether the bubble point pressure of the sampling fluid was known and on-site emergency sampling situation. Besides, the influences of ground temperature on fidelity parameters were analyzed, and corresponding correction methods were put forward. The research shows that the fidelity sampling cylinder while drilling can effectively improve the fidelity of the sample. When the formation fluid sample reaches the surface, it can basically ensure that the sample does not change in physical phase state and keeps the same chemical components in the underground formation.展开更多
Mg63Ni22Pr15 metallic glasses are produced by a single roller melt-spinning technique. The hydrogen absorption and desorption capacities are respectively 0.38 and 0.14 wt% at 313 K obtained by pressure-composition iso...Mg63Ni22Pr15 metallic glasses are produced by a single roller melt-spinning technique. The hydrogen absorption and desorption capacities are respectively 0.38 and 0.14 wt% at 313 K obtained by pressure-composition isotherm. The amorphous structure is found to be retained after gaseous hydrogenation. The glass transition temperature, the onset crystallization temperature, and the crystallization temperature of the hydrogenated Mg63Ni22Pr15 metallic glass are 550, 570 and 577K, respectively, much higher than the corresponding values of 440, 470 and 499K of the as-quenched sample. This means that dramatic enhancement of thermal stability occurs in Mg63Ni22Pr15 metallic glass due to hydrogenation.展开更多
A rock-bed provides a highly efficient and cost-effective heat storage solution for solar concentrators employing air as the heat-conducting fluid.This pioneering technology was first deployed on an industrial scale a...A rock-bed provides a highly efficient and cost-effective heat storage solution for solar concentrators employing air as the heat-conducting fluid.This pioneering technology was first deployed on an industrial scale at the Ait Baha concentrated solar plant in Morocco,delivering a thermal storage capacity of 100 MWh.This work aims to explore the thermal behavior of large-scale reservoir under real operating conditions and also to explore the impact of pre-charging on system performance.For this purpose,a Computational Fluid Dynamics(CFD)model,rigorously validated through experimental measurements,is employed.Based on the number of Pre-Charging Cycles(PCCs),scenarios with 0,1,3,4,5,6,and 7 PCCs were analyzed over 30 days of system operation and compared to the reference case characterized by 0 PCCs.The results demonstrate that starting the system with PCCs significantly improves performance during the early cycles,effectively mitigating initial inefficiencies,enhancing operational efficiency,and reducing the duration of transient behavior during energy input and output phases.The analysis identifies six PCCs as the optimal balance for this system,delivering high efficiency and stabilizing performance with the minimal fluctuations by the 5th operational cycle.Furthermore,a comprehensive guideline is proposed to determine the optimal number of PCCs,ensuring the prevention of system overload and the minimization of energy waste during the pre-charging process.展开更多
文摘A mixed-signal driver chip for a 132 × 64-pixel passive matrix OLED panel is presented. The chip has a 64-step gray scale control using the PWM method and two-step voltage pre-charge technology to pre-charge the OLED pixels. It consists of a digital controller,SRAM for display data memory,a DC-DC voltage converter,reference current generators,a pre-charge voltage generator,64 common drivers, and 132 segment drivers. The single chip is a typical current-drive circuit. It has been implemented in a Chartered 0.35/μm 18V HV （DDD） CMOS process with a die area of 10mm× 2mm. Test results show that the power consumption of the whole chip and all pixels with a constant driving current of 100μA while displaying the highest gray scale is 294mW with a 12V high voltage supply and a 3V low voltage supply.
基金supported by National Hi-tech Research and Development Program of China(863 Program,No.2005AA501020)National Basic Research and Development Program of China(973 Program,No.2007CB209707).
文摘In order to improve the drivability and energy efficiency of electric vehicle(EV),more and more batteries are connected in series with high voltage which makes it necessary to monitor the electric parameters of high voltage system(HVS)to ensure the high voltage safety.A high voltage safety management system is developed to solve this critical issue.Several key electric parameters including pre-charge,contact resistance,insulation resistance and remaining capacity are monitored and analyzed based on the presented equivalent models.An electronic unit called high voltage safety controller is developed.By the help of hardware-in-loop system,the equivalent models integrated in the high voltage safety controller are validated and the on-line electric parameters monitor strategy is discussed.The real vehicle experiment results indicate that the high voltage safety management system designed is suitable for EV application.
基金Supported by the Sinopec Major Science and Technology Project (JPE19007)。
文摘A design idea of fidelity sampling cylinder while drilling based on surface nitrogen precharging and supplemented by downhole pressurization was proposed, and the working mode and optimization method of sampling parameters were discussed. The nitrogen chamber in the sampling cylinder functions as an energy storage air cushion, which can supplement the pressure loss caused by temperature change in the sampling process to some extent. The downhole pressurization is to press the sample into the sample chamber as soon as possible, and further increase the pressure of sample to make up for the pressure that the nitrogen chamber cannot provide. Through the analysis of working mode of the sampling fidelity cylinder, the non-ideal gas state equation was used to deduce and calculate the optimal values of fidelity parameters such as pre-charged nitrogen pressure, downhole pressurization amount and sampling volume according to whether the bubble point pressure of the sampling fluid was known and on-site emergency sampling situation. Besides, the influences of ground temperature on fidelity parameters were analyzed, and corresponding correction methods were put forward. The research shows that the fidelity sampling cylinder while drilling can effectively improve the fidelity of the sample. When the formation fluid sample reaches the surface, it can basically ensure that the sample does not change in physical phase state and keeps the same chemical components in the underground formation.
基金Supported by the National Natural Science Foundation of China under Grant No 50431030, and the Young Scholar Foundation of Nanjing University of Science and Technology under Grant No 200404.
文摘Mg63Ni22Pr15 metallic glasses are produced by a single roller melt-spinning technique. The hydrogen absorption and desorption capacities are respectively 0.38 and 0.14 wt% at 313 K obtained by pressure-composition isotherm. The amorphous structure is found to be retained after gaseous hydrogenation. The glass transition temperature, the onset crystallization temperature, and the crystallization temperature of the hydrogenated Mg63Ni22Pr15 metallic glass are 550, 570 and 577K, respectively, much higher than the corresponding values of 440, 470 and 499K of the as-quenched sample. This means that dramatic enhancement of thermal stability occurs in Mg63Ni22Pr15 metallic glass due to hydrogenation.
基金supported by IRESEN (Institut de Recherche en ??nergie Solaire et ??nergies Nouvelles, Morocco) through the INNOTHERM 1 projectthe Moroccan Ministry of Higher Education and Research for the PPR/2015/31 and PPR/2015/56 projects。
文摘A rock-bed provides a highly efficient and cost-effective heat storage solution for solar concentrators employing air as the heat-conducting fluid.This pioneering technology was first deployed on an industrial scale at the Ait Baha concentrated solar plant in Morocco,delivering a thermal storage capacity of 100 MWh.This work aims to explore the thermal behavior of large-scale reservoir under real operating conditions and also to explore the impact of pre-charging on system performance.For this purpose,a Computational Fluid Dynamics(CFD)model,rigorously validated through experimental measurements,is employed.Based on the number of Pre-Charging Cycles(PCCs),scenarios with 0,1,3,4,5,6,and 7 PCCs were analyzed over 30 days of system operation and compared to the reference case characterized by 0 PCCs.The results demonstrate that starting the system with PCCs significantly improves performance during the early cycles,effectively mitigating initial inefficiencies,enhancing operational efficiency,and reducing the duration of transient behavior during energy input and output phases.The analysis identifies six PCCs as the optimal balance for this system,delivering high efficiency and stabilizing performance with the minimal fluctuations by the 5th operational cycle.Furthermore,a comprehensive guideline is proposed to determine the optimal number of PCCs,ensuring the prevention of system overload and the minimization of energy waste during the pre-charging process.
