文章介绍了基于工业以太网的新兴现场总线Ethernet Power Link的系统组成,以及基本原理出发,对基于Ethernet Power Link总线系统的德国克朗斯无菌饮料灌装机控制系统的硬件组成和软件设计作了较为详细的阐述,并从应用上表明了Ethernet P...文章介绍了基于工业以太网的新兴现场总线Ethernet Power Link的系统组成,以及基本原理出发,对基于Ethernet Power Link总线系统的德国克朗斯无菌饮料灌装机控制系统的硬件组成和软件设计作了较为详细的阐述,并从应用上表明了Ethernet Power Link现场总线控制的系统优势。展开更多
For the reliability and power consumption issues of Ethernet data transmission based on the field programmable gate array （FPGA）, a low-power consumption design method is proposed, which is suitable for FPGA impleme...For the reliability and power consumption issues of Ethernet data transmission based on the field programmable gate array （FPGA）, a low-power consumption design method is proposed, which is suitable for FPGA implementation. To reduce the dynamic power consumption of integrated circuit （IC） design, the proposed method adopts the dynamic control of the clock frequency. For most of the time, when the port is in the idle state or lower-rate state, users can reduce or even turn off the reading clock frequency and reduce the clock flip frequency in order to reduce the dynamic power consumption. When the receiving rate is high, the reading clock frequency will be improved timely to ensure that no data will lost. Simulated and verified by Modelsim, the proposed method can dynamically control the clock frequency, including the dynamic switching of high-speed and low-speed clock flip rates, or stop of the clock flip.展开更多
网络技术的发展使得以太网供电技术(Power Over Ethernet, POE)愈发成熟,本文从几代POE技术的发展入手,简述了POE供电的工作原理,建立了POE供电系统内在参数之间的简化数学模型,进一步分析了POE技术在理想状态下的有效供电范围,得出了PO...网络技术的发展使得以太网供电技术(Power Over Ethernet, POE)愈发成熟,本文从几代POE技术的发展入手,简述了POE供电的工作原理,建立了POE供电系统内在参数之间的简化数学模型,进一步分析了POE技术在理想状态下的有效供电范围,得出了POE供电回路下工作电流与受电端输入电压、回路线阻、负载功率等参数之间的数学关系,验证了IEEE Std 802.3af、802.3at和802.3bt等国际技术标准规定主要参数的合理性,为POE技术的应用提供了基础理论依据。展开更多
Power over Ethernet(以太网供电,简称PoE),连接照明系统可以报告自身的能源消耗情况,这一性能通过数据反馈有效驱动了能源管理,可以比传统照明解决方案节省更多的能源。随着LED灯具照明效能的逐步提高,在美国已经有越来越多的LED灯具...Power over Ethernet(以太网供电,简称PoE),连接照明系统可以报告自身的能源消耗情况,这一性能通过数据反馈有效驱动了能源管理,可以比传统照明解决方案节省更多的能源。随着LED灯具照明效能的逐步提高,在美国已经有越来越多的LED灯具具备通过市场上可用的PoE输入功率的性能,但是在数据的统计标准与粒度等方面还有待细化与统一。了解美国PoE照明系统当前在能源报告方面的最新现状、存在的问题以及改进的方向,可以为我国建筑节能技术的发展提供有益的借鉴。展开更多
文摘文章介绍了基于工业以太网的新兴现场总线Ethernet Power Link的系统组成,以及基本原理出发,对基于Ethernet Power Link总线系统的德国克朗斯无菌饮料灌装机控制系统的硬件组成和软件设计作了较为详细的阐述,并从应用上表明了Ethernet Power Link现场总线控制的系统优势。
基金supported by the Natural Science Foundation of China under Grant No.61376024 and No.61306024Natural Science Foundation of Guangdong Province under Grant No.S2013040014366Basic Research Programme of Shenzhen under Grant No.JCYJ20140417113430642 and No.JCYJ20140901003939020
文摘For the reliability and power consumption issues of Ethernet data transmission based on the field programmable gate array （FPGA）, a low-power consumption design method is proposed, which is suitable for FPGA implementation. To reduce the dynamic power consumption of integrated circuit （IC） design, the proposed method adopts the dynamic control of the clock frequency. For most of the time, when the port is in the idle state or lower-rate state, users can reduce or even turn off the reading clock frequency and reduce the clock flip frequency in order to reduce the dynamic power consumption. When the receiving rate is high, the reading clock frequency will be improved timely to ensure that no data will lost. Simulated and verified by Modelsim, the proposed method can dynamically control the clock frequency, including the dynamic switching of high-speed and low-speed clock flip rates, or stop of the clock flip.
文摘Power over Ethernet(以太网供电,简称PoE),连接照明系统可以报告自身的能源消耗情况,这一性能通过数据反馈有效驱动了能源管理,可以比传统照明解决方案节省更多的能源。随着LED灯具照明效能的逐步提高,在美国已经有越来越多的LED灯具具备通过市场上可用的PoE输入功率的性能,但是在数据的统计标准与粒度等方面还有待细化与统一。了解美国PoE照明系统当前在能源报告方面的最新现状、存在的问题以及改进的方向,可以为我国建筑节能技术的发展提供有益的借鉴。
