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This paper presents a Multiphase Energy Generation System (MEGS) dedicated for applications requiring an increased reliability and fault-tolerant operation. It is shown that proposed solution allows for continuous performance of a multiphase back-to-back power converter in case of grid side converter leg failure. An inherent feature of multiphase machines for post-fault operation with adequate reconfiguration...
This paper presents a circuitry for physically unclonable function, generating a unique and stable key for security-oriented applications. The key is generated from an array of pairs of voltage-compensated proportional-to-absolute-temperature generators. The difference between two analog outputs of a pair is voltage- and temperature-compensated yet sensitive mostly only to random threshold-voltage...
This paper presents a fully-integrated 16-channel wireless neural interfacing SoC that employs an adiabatic stimulator powered directly from a 190-MHz on-chip antenna to eliminate bulky external components while simultaneously avoiding rectifier and regulator losses. Using a charge replenishing architecture, the stimulator outputs up to 145-μA, while achieving a 63.1% charge replenishing ratio and...
This paper describes the process of performing site tests and model development of brushless exciters. Brushless exciters are often a source for model inaccuracy when studying synchronous machines and excitation system, which may lead to incorrect stabiliser design and poor performance. The process described here involves on site testing of the excitation system both with the generating unit operating...
The development of a short pulse generator is of paramount importance for various applications. Nanosecond pulse generators (NS-PG) which can generate a pulsed voltage with 5ns of duration and 2 ns of rise and fall times have been developed. Nanosecond pulsed discharges enable higher energy efficiencies of plasma processing, whose advantages include the ability to treat gas phases, allowing this device...
Wireless sensors went through a significant evolution in the past years, however the battery based operation still not sustainable for longer periods. Energy harvesting can be the solution, if some conditions are met. In this paper solar cells and thermoelectric generators as power sources were inspected in detail, special power supply and storage units were designed for this purpose. Numerous measurements...
This paper presents a current-mode neural/muscular stimulator with an exponentially decaying stimulation current. The use of exponentially decaying current makes the voltage on the stimulating electrode constant during the stimulation, which eliminates the headroom and increases the power efficiency. A simple exponentially decaying current generator is proposed based on Taylor series approximation...
The development of an arbitrary MV generator (AMVG) is a quite complex task. The level of voltage amplitude requires a careful analysis of any possible solutions at the level of its design, by finding the best tradeoff between performance and cost. In this perspective, a very attractive solution is represented by the way followed by the authors, in which the cost of the AMVG has been kept low thanks...
Electron gun have developed for Compact Electron LINAC during 2 years in SKKU, Korea. Applications of the electron gun are 6 MV X-ray generator for medical treatment and 15 MV high dose rate X-ray generator for non-destructive detector. It is sure that they required different specification of initial electron beam at electron source, so that the electron gun were designed in term of different beam...
Electrical explosion of single wire is the initial stage of wire array z-pinches. In order to study the physical process of single wire explosion, a small-scale pulsed power generator was established, which can provide positive and negative polarity current with the peak value of 3kA and the rise-time from 20ns to hundreds of nanoseconds. The single wire loads are bare and insulation coated tungsten...
In the design of future Z-pinch driver, the monolithic radial transmission lines (MRTL) were used to combine the outputs of many pulse generators to Z-pinch load. In order to investigate the transmission characteristic of the MRTL with different impedance profiles, 3-dimensional electromagnetic simulation has been performed. From the results of 3-dimensional electromagnetic simulation, it was found...
The present work is directly related to a repetitive 0.6 MV, 10 GW Tesla-driven Blumlein pulsed power generator, successfully developed at Loughborough University. In the second phase of the project, aiming at further compressing and modulating the output pulse using a bipolar pulse forming line system, multi-GHz diagnostic equipment is required to accurately measure the bipolar voltage output approaching...
Nanosecond pulsed generator can generate large-area homogeneous and low temperature plasmas at atmospheric pressure, which has attracted much attention1, 2. In this paper, a home made repetitive nanosecond-pulse generator, which is based on magnetic compression system, is used to produce diffuse discharges in a double-pins-to-plane gap. The output voltage has a rise time of ∼70 ns and a full width...
This paper presents results on the utilization of newly-developed 24-kV n-channel silicon carbide Insulated-Gate Bipolar Transistors (IGBTs) for Marx generator circuits. These state-of-the-art devices were evaluated in a small-scale, four-stage voltage multiplication circuit for their possible use in multi-scale power modulators. The 24 kV IGBTs had a chip area of 0.81 cm2 and were rated for 20 A...
An experiment system of a scaled-down monolithic radial transmission line (MRTL) for future Z-pinch drivers was established to testify the validity of 3-D electromagnetic (EM) simulation. The MRTL had a hyperbolic impedance profile. Being immersed in deionized water, the MRTL was composed of two flat aluminum plates separated by a distance of 1 cm. The radius of both plates was 0.5 m, which corresponds...
AWE is replacing its current Mevex X-ray machine (∼800kV, 35kA, 60ns pulse) to improve reliability and maintainability. A design using a Linear Transformer Driver (LTD) insulated with dry air at atmospheric pressure has been developed by ITHPP. A testbed using 3 cavities, made from 2 bricks of two GA35460M 8nF, 100kV capacitors, a multigap multichannel switch and a magnetic core, has been developed...
This paper outlines procedures and experience the author had on commissioning and field tuning ABB Unitrol P AVR and PSS of a 160 MW steam turbine. Field measurements are provided in the paper for demonstration of transient responses. In addition, UEL verification test was conducted and test method is described in this paper. Transient responses from computer simulations are also provided in this...
This paper investigates the effect of harmonics due to renewable generation, energy-saving home appliances and electric vehicle chargers. Harmonics were found to be contained at the transmission level due to the presence of shunt capacitors. These shunt capacitors behave like single-tuned or high-pass harmonic filters, however there will be an increased risk of harmonic resonance making the transmission...
This paper presents the design of a new threshold compensation technique for UHF Dickson rectifiers. The proposed solution addresses the efficiency reduction of previous architectures especially under large input powers. The measurements show that the proposed technique achieves very good efficiency within 10 dBm variation of the input power. Therefore, the technique is suitable for applications where...
When the poloidal field (PF) magnet power supplies (MPS) of 11 units are operated, max power of 200 MVA is required to achieve long pulse operation of Korea Superconducting Tokamak Advanced Research (KSTAR). Motor Generator (MG) system was installed to resolve power shortage because the available grid power is only 100 MVA at the National Fusion Research Institute (NFRI) site. MG system is composed...
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