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It has obvious advantage to adopt 802.1x authentication for network access control. This paper analyzes 802.1x protocol, EAP protocol and RADIUS protocol, and constructs AAA which is based on 802.1x authentication at the end. Using software the messages of the whole authentication process have been captured. According to AAA mechanism it analyzes EAP messages and RADIUS messages detailedly. The analysis...
For high power applications, a novel three-phase three-level parallel resonant dc/dc converter with variable frequency control strategy was proposed in this paper. The main advantages of this converter are listed as follows. The converter has a simple topology with only six power switches. The voltage stress on power switches is only half of the input voltage, and the three-phase configuration reduces...
Multi-phase multi-level converter is an optimal alternative for high input and high power system. The voltage stress on the primary switch is only one-nth of the input voltage due to its multi-level structure. The current rating of power devices can be reduced by the multi-phase structure. To achieve soft-switching and improve efficiency, the resonant tank can be introduced to optimize the performance...
In this paper, the application of adjustable angle ds-qs axis transformation for three-phase current source induction motor drive is proposed. In order to reduce higher switching number caused by ignoring induction motor back-EMF, the ds-qs axis transformation with regulating angle technology is applied to motor drive. Using hysteresis current controller and voltage space vector, the status of switches...
Three-phase three-level (TPTL) dc/dc converter has the advantages of lower voltage and current stress on switches, which is suitable for high power and high input voltage applications. Adopting a symmetrical control strategy, the ripple frequency of input and output current can be increased significantly, resulting in a reduced filter requirement. However, all the switches are hard-switching, leading...
We present a Pulsed Laser Activated Cell Sorter (PLACS) integrated with 3D sheathless inertial focusing that is capable to sort at 10,000 particles sec−1 with >90% sort purity and 6,000 cells sec−1 with >80% sort purity. It is realized by exciting laser induced cavitation bubbles in a single layer PDMS microfluidic channel to create high speed liquid jets to deflect detected fluorescent samples...
For low-light-level imaging, the performance of a CMOS image sensor (CIS) is usually limited by the temporal readout noise (TRN) generated from its analog readout circuit chain. Although a sub-electron TRN level can be achieved with a high-gain pixel-level amplifier, the pixel uniformity is highly impaired up to a few percent by its open-loop amplifier structure [1]. The TRN can be suppressed without...
The paper proposes a single-phase to three-phase AC/AC converter with regeneration and adjustable power factor. The circuit architecture is a capacitor connected in series with a single-phase full-bridge and three-phase full bridge. The proposed converter has several advantages such as adjustable power factor, sinusoidal input current, adjustable frequency, single stage control, energy regeneration,...
This paper proposes a solution that employs transistor self-conduction and circuit design techniques to improve ESD performance for SOI RF switch applications. The primary limitations and challenges in the ESD design for SOI technology are discussed. The solution enables the switch to pass 8kV IEC as well as typical HBM standards.
In this paper, based on generalized zero vector a novel simple PWM control circuit for a three-phase inverter is presented. The proposed control circuit, consists of a simple analog circuit to achieve function of DPWM (Discontinuous Pulse Width Modulation), has several advantages such as lower switching losses, higher efficiency and voltage usage utility, pure sinusoidal output and cost down etc....
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