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Software Defined Networking (SDN) can benefit a Network Function Virtualization solution by chaining a set of network functions (NF) to create a network service. Currently, control on NFs is isolated from the SDN, which creates routing inflexibility, flow imbalance and choke points in the network as the controller remains oblivious to the number, capacity and placement of NFs. Moreover, a NF may modify...
The neutral point (NP) potential self-balancing of five-level full bridge inverters with conventional modulation strategy is related to the modulation index. Both the voltages of two split-capacitors should be sampled and controlled, when the inverter operates with the low modulation index. Therefore, an improved modulation strategy is proposed to realize the NP potential self-balancing for five-level...
This paper proposes a systematic method of the topology generation rules to generate dual-buck inverter topologies based on the concept of power flowing routes splitting and reconstruction. By using these topology generation rules, not only the existing dual-buck inverter topologies, but also a family of new transformerless DBFBI topologies with high reliability are derived from conventional H-bridge...
In the basic zero-voltage-switching (ZVS) full-bridge (FB) converter, the output rectifier diodes suffer from hard-switching, results in severe voltage spike and oscillation across the output rectifier diodes. In this paper, a fundamental approach is proposed to tackle this issue, indicating that clamping the voltage across the winding of the power transformer could eliminate the voltage oscillation...
A T-type three-level inverter topology with RB-IGBT is researched. The operation modes and modulation strategy is analyzed. The power loss of T-type inverter with RB-IGBT and normal IGBT is calculated and compared. Experimental results show that T-type inverter with RB-IGBT has better efficiency than that of normal IGBT.
In this paper a DC-DC power converter for distributed photovoltaic plant architectures is presented. The proposed converter has the advantages of simplicity, high efficiency, and low cost. High efficiency is achieved by having a portion of the input PV power directly fed forward to the output without being processed by the converter. The operation of this converter also allows for a simplified maximum...
With the development of radio frequency wireless communication technology, there are strong demands of spiral inductor with high performance and low profile. The inductor is a basic component of IPD (Integrated Passive Devices [1]) including oscillators, filters, mixers and baluns. In this paper, the structure and process of fabricating a high performance wafer level silicon-base spiral inductor was...
A novel H6-type inverter is proposed for the trade-off solution of common-mode current (leakage current) and conversion efficiency in transformerless photovoltaic (PV) grid-connected energy generation system. A direct power passing path is introduced into the H5 topology to ensure the current flows through less power switches than that in the H5 topology during the operational mode of direct power...
The modular non-isolated inverter structure enhances the efficiency and redundancy of the PV generation system. Current coupling between the transformerless grid-connected inverter modules for PV power system is researched. The operation modes of the non-isolated inverters with different topologies and modulations are analyzed and the current decoupling conditions are obtained. Inverters which are...
A wide tuning range 24GHz VCO (voltage-controlled oscillator) using IBM 90nm CMOS process is presented. Switched inductor and two bits capacitance array offer a widely tuning range. In addition, optimized switches are adopted to improve both tuning range and phase noise performance. Simulation shows that -101dBc/Hz phase noise is achieved at 1MHz offset. The tuning range of the VCO spans from 21.9GHz...
A low phase-noise 24GHz VCO (voltage-controlled oscillator) for mm-wave WLANs (wireless LANs) using IBM 90nm CMOS process is presented. A current source is used to minimize the impact due to the process variation. Biasing filter technique is adopted to improve the phase noise performance. In addition, optimized switches are proposed to prevent phase noise degradation. Simulation shows that -101dBc/Hz...
A 10-Gb/s transimpedance amplifier (TIA) for the parallel optical receiver module is realized in 0.18-μm CMOS technology. The proposed TIA employs a regulated cascode (RGC) input structure and adopts active inductor peaking and feedback techniques to enhance the bandwidth. Besides, a noise optimization is processed. The TIA provides a conversion gain of 50 dBΩ and 3-dB bandwith of 7 GHz. The measured...
Degradation of phenol by an electrochemical heterogeneous catalytic process was applied in packed bed electrolytic reactor with graphite electrode. The catalyst was characterized by SEM and the effects of pH, the applied potential and Na2SO4 on the efficiency of the electrochemical oxidation phenol process were also studied. It was found that the optimal condition was an applied potential of 25V,...
A novel inductor model, which considers the magnetic and capacitive substrate coupling comprehensively, and a new fast approach for substrate network parameter extraction are presented in this paper. The introduction of substrate parasitic inductance (SPI) and the mutual inductance is based on the resonance characteristic of the measured substrate's Y-parameter and their physical meaning. A series...
A novel bi-directional buck-boost converter used for battery charging and discharging cooperated with a three-level half bridge inverter in a UPS is proposed. The operation of charging and discharging can be controlled respectively, and the capacitor voltage balance can be achieved based on the peak current control. The operating principle and parameter design of the converter are analyzed in detail...
We present a novel methodology to extract model parameters from measured S-parameter for silicon on-chip center-tapped differential spiral inductor. The double-pi equivalent circuit topology is employed in which conductor skin effect is considered. The extraction procedure based on Modified Differential Evolution is demonstrated to be efficient and effective. The excellent accuracy of the results...
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