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This paper is concerned with the analysis of connecting PROFIBUS with 4G mobile network to realize the application of 4G in the field bus. First, development status and technical characteristics of PROFIBUS in the industrial network are analyzed, including the requirements of PROFIBUS Fieldbus for wireless communication systems in the intelligent and networking development. Then, the authors introduce...
In order to make wireless technology be easily applied in industrial environment, the wireless gateway for industrial fieldbus has been designed. This paper studies network structures and protocols of PROFIBUS-DP and Wi-Fi at first, then puts forward to using the method of embedded gateway finishing the interconnection communication of the two kinds of heterogeneous networks. Finally, the paper designs...
In the multi-MHz low voltage, high current applications, Synchronous Rectification (SR) is strongly needed due to the forward recovery and the high conduction loss of the rectifier diodes. This paper applies the SR technique to a 10-MHz isolated class-Φ2 resonant converter and proposes a self-driven level-shifted Resonant Gate Driver (RGD) for the SR FET. The proposed RGD can reduce the average on-state...
One of the challenge of multi-MHz resonant converters is to drive the power FETs efficiently in wide input voltage range, for the reason that the phase angle between the drain-to-source voltage and gate drive voltage of the power FETs varies with the input voltage. The phase angle variation results in high reverse conduction loss and switching loss seriously at high frequency, especially for the eGaN...
Because of the forward recovery, the performance of the diodes degrades seriously at multimegahertz, causing extremely high power loss. So, the synchronous rectification (SR) is strongly desired in the multimegahertz resonant converters. This paper proposes a self-driven level-shifted resonant gate driver (RGD) for the SR FET in a 10-MHz isolated class-Φ2 resonant converter. The proposed RGD provides...
The connection between PROFIBUS network and Internet can realize remote real-time monitoring device on the fieldbus. This paper conducts detailed analysis and research advance on network security based on the interconnection methods between PROFIBUS and Internet, and proposes a PROFIBUS industrial network security model. An embedded gateway is developed especially for meeting the security requirement...
Wireless mesh networks usually deploy multiple gateways to enhance the capacity. This paper studies how to maintain forwarding paths in 802.11s wireless mesh network. A Multi-Gateway Multipath routing protocol (MGMP) is proposed to explore path diversity. MGMP constructs multiple paths between source and destination using a proactive tree architecture as HWMP. In order to make MGMP more efficient,...
A low-power MOSFET-only voltage reference circuit is proposed which compensates for the temperature dependence of a proportional-to-absolute-temperature (PTAT) voltage generated by a pair of MOS devices working in the subthreshold region with a gate-to-source voltage of an MOS transistor operating in the same region. The voltage reference circuit, designed for a standard 0.6 mum CMOS process, has...
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