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配电监测无线远程数据通信模式研究与设计 总被引:3,自引:1,他引:3
本文介绍了一种采用HAC系列微功率无线数传技术和GPRS技术相结合的配变监测远程无线数据通信模式,阐述了系统的通信原理,给出了系统硬件电路和软件结构的设计方法,为提高远程多点数据传输系统的性价比提供了一种新的思路。 相似文献
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在分析研究AB类运算放大器的输入和输出级构成原理基础上,提出一种与信号处理模块的输出端匹配并具有一定负载能力的缓冲器的设计。缓冲器采用了AB类运放结构,其输入级采用折叠式共射共基结构,输出级分别采用PNP管和NMOS管作为上拉管和下拉管,结合电路结构的改进使之具有轨到轨(rail-to-rail)的输出特性和很低的静态电流。设计的电路具有开环增益大、静态功耗小、带宽较高等特点。此运放已在1.5μmBCD工艺下实现。测试结果表明,静态电流仅为8.5μA,闭环带宽达200kHz,开环增益为100dB。 相似文献
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随着硅集成电路制造工艺和设计工具的快速发展,硅霍尔传感器性能得到大幅度提高,特别是近年来采用了“斩波”动态失调消除、微功耗、可编程等一系列新技术,使产品的稳定性、工作温度范围、磁场灵敏度等方面得到显著改进。本文介绍了BiCMOS霍尔传感器产品采用的最新设计制造技术及其基本原理。 相似文献
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A unique new design of a chip integrated fuel cell accumulator is presented. The system combines an electrolyser and a self-breathing polymer electrolyte membrane (PEM) fuel cell with integrated palladium hydrogen storage on a silicon substrate. Outstanding advantages of this assembly are the fuel cell with integrated hydrogen storage, the possibility of refuelling it by electrolysis and the opportunity of simply refilling the electrolyte by adding water. By applying an electrical current, wiring the palladium hydrogen storage as cathode and the counter-electrode as anode, the electrolyser produces hydrogen at the palladium surface and oxygen at the electrolyser cell anode. The generated hydrogen is absorbed by the palladium electrode and the hydrogen storage is refilled consequently enabling the fuel cell to function. 相似文献
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低压高频PWM DC/DC转换器芯片设计 总被引:6,自引:1,他引:6
便携式电子设备对电源管理芯片的设计提出了新的挑战。文中采用新的设计方法和思路 ,设计了一个开关电源PWMDC/DC转换器芯片 ,启动电压最低至 1V ,功率管开关频率高达 6 0 0kHz,采用PWM PFM间歇工作方式 ,较好地克服了开关电源轻负载时效率低的问题 ,电源效率一直保持较高 ,适用于寻呼机、手机等便携式电子设备。 相似文献
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Richard J. Coggins Raymond J.W. Wang Marwan A. Jabri 《Analog Integrated Circuits and Signal Processing》1999,18(2-3):301-312
Micropower signal classification and compression are becoming important requirements for implantable cardioverter defibrillators although they are currently limited by power and computational constraints. This paper describes an integrated circuit that facilitates Intracardiac Electrogram (ICEG) classification and compression of 30 dimensional analogue vectors while consuming a maximum of 2.5 W power for a heart rate of 60 beats per minute (1 vector per second) from a 3.3 V supply. This represents a significant advance on previous work which achieved ultra low power supervised morphology classification [6] since the templated matching scheme used in this chip enables unsupervised blind classification of abnormal rhythms and the computational support for low bit rate data compression. The adaptive template matching scheme used is tolerant to amplitude variations, and inter- and intra-sample time shifts. Micropower performance is achieved using CMOS analogue circuits biased in weak inversion in order to minimise energy per computation. Results from the fabricated chip demonstrate the impact of the amplitude and shift tolerance on ICEG data and performance for blind classification of an abnormal rhythm in five heart patients. For four out of the five patients, no false negative classifications and a worst case of 11% false positive classifications were made. 相似文献
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智能涡街流量计的研制 总被引:3,自引:0,他引:3
介绍一种集温度、压力、流量就地显示于一体的智能涡街流量计的研制。采用先进的单片微机及微功耗芯片,实现在线多种信号采集和数据处理,并采用软件容错技术,大大提高了仪表的可靠性和测量准确度。 相似文献
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矿渣微粉的研制及应用研究 总被引:4,自引:1,他引:3
矿渣微粉作砼掺合料,有着很好的应用价值。用试验小磨进行了不同比表面积矿粉的性能试验,同时进行了不同矿粉掺量砼的性能试验。结果表明:矿渣微粉的活性指数高,流动性好。生产矿渣微粉的最佳粉磨比表面积为450—500m^2/kg。另外用矿粉代替部分水泥后,砼28d抗压值接近甚至高于对比样;且砼流动性改善明显,1h塌落度损失少;同时还降低了砼的生产成本。所以矿渣微粉是配制高强高性能砼的优质掺合料。 相似文献