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In this paper the simple method to reduce the switching energy of capacitive digital-to-analog converters (DACs) in low-power successive approximation register (SAR) analog-to-digital converters (ADCs) is described. The method is based on the well-known monotonic switching procedure and the use of one intermediate voltage level during switching. Unlike most recently published switching methods the...
In this paper, a DC-DC buck converter using a multi-bit (two-bits) delta-sigma modulator to control segmented output switches of the converter is proposed to enhance its efficiency and improve its output ripple. This converter operates in continuous condition mode (CCM). Here, the two output bits of the modulator control the switching of the main and the supplementary switches. The circuit is simulated...
In this paper, a new single-phase multilevel inverter topology suited for distributed DC sources is proposed. The proposed inverter is comprised of a voltage-level generator connected in series to the input of the classical H-bridge. The voltage-level generator is only able to generate positive DC voltage levels at its output. The H-bridge is used to generate the negative and zero voltage levels....
This article presents a case study and comparison of simulations carried out by SimPy 3.0 of Python module and OMNeT++ tool to explore the performance. The target of this comparison is in particular configuration of network for future steps what tools would be good to use. Two simple models of a network were created with Python and C++ language.
Factory acceptance tests performed on High Voltage Direct Current (HVDC) transmission apparatus usually involve the application of high direct voltage and switching impulse voltage in separate withstand tests used to qualify the insulation system. However, the actual stress subjected to the equipment insulation system while in-service on the HVDC transmission system, is a switching surge transient...
Non-pharmacological and non-surgical transcranial stimulation of the nerve function may provide new opportunities in evaluation and treatment of cranial nerve diseases. Stimulation can additionally help to uncover the mechanism of various brain processes by temporarily altering the normal function of healthy brains. Transcranial ultrasound stimulation(TUS) is in the early stages of human applications,...
A novel adaptive off-time (AOT) technique, which is applicable to the circuit design of an AC-DC constant-current LED driver using hysteresis-current control method, is proposed in this paper. The AOT is achieved by a novel off-time control method, which is based on the combination of peak-current-loop and error sample feedback-loop, to solve the problem that peak current is not consistent with average...
This paper proposes a novel method of suppressing inrush currents of squirrel-cage induction machines using matrix converter in wind power generation systems. In the proposed method, the series-connected side of the matrix converter behaves as a resistor for the induction machine current. Digital computer simulation is implemented to confirm the validity and practicability of the proposed method using...
This paper introduces a memristor based redundant binary adder for canonic signed digit code, that coding eliminates the carry and provides a carry-free addition. The proposed binary adder circuit tries to achieve high addition speed that is independent on the length of the data using the accumulation property of a Nano-element called a memristor. The general block diagram of the proposed circuit...
Due to the continuous increases of the tonnage and consequently of the power required on board, low voltage systems are being replaced by High Voltage (HV) distribution systems. The advantages are a partial reduction in fault currents values and cable weights, with consequential benefit for overall weight and dimensions. The 2010 Manila Amendments to the Standards of Training, Certification and Watchkeeping...
This paper discusses the employment of averaged circuit-based models for studying the electromagnetic transients of three-phase, grid-connected, photovoltaic (PV) systems. The paper first briefly introduces the structure and controls of a three-phase grid-connected PV system, and then presents the procedures for construction of averaged models for power-electronic core of the PV system. Finally, the...
This paper presents the modeling and simulation work completed in the project sponsored by ONR grant N00014-08-C-0227. The project is to investigate new design concepts of all-electric ship integrated power systems (IPS) and to develop PEBB-based converter models that will represent the existing commercially available products with adequate details and interfaces to allow them to be used in various...
The multi-input converters are synthesized from two or more single input converters in order to obtain a compact structure with one output filter and one control system. The proposed configurations are obtained mixing buck hybrid DC-DC converters and classical buck structure. Preliminary theoretical analyses, validated by digital simulations, come to support the proposed converters.
A switched capacitor charge pump applicable to phase change memory(PCM) is presented, which can provide a extra low ripple DC output of 5V with a maximum load condition of 10mA. For low output ripple and high power effiency, a novel operation mode is used. Compared with the conventional switched capacitor charge pump, the flying capacitor of the proposed charge pump is charged to Vo-VDD instead of...
Control system of micro-plasma arc welding machine, including timing control system and parameters control system, has been studied deeply. Based on the study on timing control system and parameters control system, their models were established by automatic control theory, and systems' model simulation was implemented and analyzed by means of Simulink/Matlab. It was showed that the model of timing...
It is essential which we study on water level control characteristics of a stream generator, for economics, security and reliability of entire operation of nuclear power plant. Robust characteristic of variable structure controller is combined with interpolation property of fuzzy logic controller in a sliding mode fuzzy controller. The control system is insensitive to burthen variety and outside disturbance...
Voltage sags from fault or ground fault are the most prevalent disturbances in electrical power system. A recent survey attributes them to 92% of all disturbances. This paper presents the simulation and experimental of 3 phase 4 wire voltage sag generator based on three dimensions space vector modulation in abc algorithm to produce voltage sag for testing electrical equipment. Experimental results...
The paper considers an integrated proactive framework for defense against spreading network worms in the Internet. The framework is intended for network worm detection (by recognizing the actions on scanning of network hosts) and containment of worm spreading (by limiting and blocking the packets transmitted by infected hosts). The framework is based on application of different heuristic detection...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
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