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In digital logic circuits, unconstrained scan tests are known to evoke much higher switching activity than functional modes. To create test conditions which are as similar as possible to functional modes, today's ATPG tools have knobs to constrain the switching activity of the generated test to a user-defined functional (= lower) level. Two-dimensional system chips (SoCs) and three-dimensional stacked...
To ensure the reliability of insulation systems of Type-II inverter-fed motors driven by power electronics, endurance tests should be performed at sinusoidal or repetitive impulsive voltage higher than the partial discharge inception voltage (PDIV) on insulation systems/models according to the standards released by the International Electrotechnical Commission (IEC). When repetitive impulsive voltages...
Using effective and harmless methods to remove contaminants from the environment and water resources have been considered by many researchers. Among the modern methods, corona discharge for creating free radicals and ozone, which is a strong and unstable pollution treatment, is the best method. The corona discharge is created by applying narrow high-voltage pulses by pulsed power generators on two...
This paper presents a contribution to the field of photovoltaic conversion system. An equivalent electrical circuit model of a PV module is presented with the appropriate algorithm of determination of internal parameters. An adaptation stage consisting of buck DC-DC converter is implemented between PV generators and the pure resistive load (lamp). The DC-DC converter is controlled by the development...
This paper presents a wide input range DC-DC converter with a robust control scheme for high speed generator energy storage systems. As the DC voltage converted from low-voltage high-speed generator may be lower or higher than the battery voltage, a step-up/down converter is needed for energy storage systems. The two-switch Buck-Boost (TSBB) converter is suitable for wide input voltage applications...
A full wave field-circuit co-simulation method is employed to characterise the time domain behaviour of the Marx generator. Radiation and conduction effects are fully considered. Results from the co-simulation and the circuit simulation are compared; it can be found that the field-circuit co-simulation provides complete information of the system which includes the radiation effect and the mutual coupling...
With the development of semiconductor technology, semiconductor switching devices have the advantages of fast switching speed, high stability, so they are popular in pulsed power research field, but the use of semiconductor switch causes the main circuit be complex and the cost increase, and the switching speed is limited by the drift velocity of the charge carriers for the particular device. So it...
Batteries drawbacks are represented by the high cost, the limited reliability and the frequent maintenance requirements (recharge or replacement). Energy Harvesting (EH) offers an alternative to batteries replacement or, at least it allows the increase of their lifetime. EH is the conversion of ambient energy, which is present in the environment, into electrical energy. Different energy sources for...
In Photo-Voltaic (PV) systems to increase the conversion efficiency, efficient converters and efficient PWM switching circuits are required. To design efficient converters and PWM switching circuits mathematical models are necessary. In the proposed study, the mathematical model for photovoltaic cell and for buck-boost converter is developed. In the mathematical model, the parasitic elements of switch,...
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...
The paper introduced the work principle of the 10/350µs impulse current generation and analyzed the feature of the crowbar trigger circuit. Crowbar trigger circuit with 10/350µs impulse current and follow current of voltage switching type surge protective device (SPD) has been researched using EMTP simulation. In order to simulate voltage switching type SPD, the equivalent impedance of the sample...
The aim of this paper is increasing performance of over / under frequency relays using of both active and passive method to prevent islanding operation. The proposed active method is based on applying high value impedance load which can improve performance of ROCOF relays (passive method) in small power mismatches. In fact, proposed method is a supplement for over / under frequency protection (OFP/UFP)...
Switched Reluctance Motors (SRMs) show great advantages of structural simplicity and high reliability in aerial starter/generator applications. This paper introduces the implementation of a high speed switched reluctance starter/generator system. First, the paper proposes a modeling method for switched reluctance starter/generator system, including switched reluctance machine and power circuit. The...
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...
Deionized water is a good dielectric material. In this paper, preliminary investigations are carried out on water breakdown in tens nanoseconds region via a switch with “point-plane” electrodes. The switch is set up on the output port of a wave erection Marx generator, which can deliver a minus high voltage pulse with an amplitude of 0∼300 kV, and a pulse width of 40∼50 ns to a matched load. According...
EFT (electrical fast transient) burst generated when electromechanical component is breaking or closing often disturb the secondary electrical equipment which directly coupled to power supply and grounding, and indirectly couple to signal cable by inductance and capacitance. In this paper, the EMS (electromagnetic sensitivity) of a DC SSR (solid state relay) in which transformer isolation circuit...
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...
A neuromorphic analog chip is presented that is capable of implementing massively parallel neural computations while retaining the programmability of digital systems. We show measurements from neurons with Hopf bifurcations and integrate and fire neurons, excitatory and inhibitory synapses, passive dendrite cables and central pattern generators implemented on the chip. This chip provides a platform...
With ambitious 2020 targets for increased energy efficiency and utilisation of sustainable energy sources fast approaching, the UK's electricity networks will need to adapt in order to integrate the vast amounts of small, distributed energy sources required. Microgeneration sources rated below 16A per phase will likely make a significant contribution to meet these targets, and as such a great deal...
This paper presents the architecture of a novel implementation of an integrated self-powered system based on piezoelectric vibrations in a 0.13 mum technology. The electromechanical transduction is performed by using a low-cost commercial piezoelectric, working at low frequencies, with voltages up to 2.5 V. The system is conceived as a System In a Package (SiP). The full integrated system is adapted...
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