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We experimentally show the performance of a Virtual Infinite Capacitor (VIC) in suppressing the voltage ripple. VIC mainly uses a bi-directional DC-DC converter with only two small capacitors inside to mimic the filtering process of a large capacitor by applying suitable control algorithms. It was firstly proposed in [1], [2] and then improved in [3] in both control algorithms and circuit designs...
Using current conveyors, we present six different current-mode circuits approximating fractional-order low-pass transfer function. Proposed circuits always use four active elements, three capacitors and seven or five resistors, whereas all are grounded. We show that the usage of only eight passive elements is sufficient to approximate a (1 + α)-order system (0 < α < 1) and can even provide better...
The paper proposes a method to use the Fibonacci numbers with odd and even indices for synthesis of switched capacitor converters (SCCs) with multiphase control. As in the previously developed method using high-radix positional numeral systems, the capacitors in the proposed method can be connected in parallel. For this purpose, a special two-dimensional (2D) array of switches is introduced. Thus,...
In this paper, a universal arm-averaged model (UAAM) is proposed for accelerated electromagnetic transient (EMT) simulation of modular multilevel converters (MMCs) based on various submodule (SM) circuits. In the UAAM, each arm of the MMC is averaged as a controlled voltage source (CVS) series connected with a controlled resistor (CR). The nonlinear characteristics of diodes are taken into consideration...
This presentation explains some of the challenges of SPICE in simulating circuits with nano-devices and proposes a circuit simulation approach that allows multidimensional and multi-parameterized device physical equations to be easily included in a circuit simulator.
Modeling and analyzing electrical energy storage devices appears crucial for recently research in engineering study. This paper researches the power and impedance of fractional-order electric circuit models: super-capacitors and batteries. For super-capacitors and batteries models, the fractional order α plays an essential role in the power and energy obtained. An interesting phenomena found out is...
Traditional mechanical OLTC has some disadvantages while changing the taps, such as causing arc, switching slowly, having high malfunction rate. This paper proposed a kind of intelligent OLTC which equips with vacuum interrupters controlled by permanent magnetic actuators (PMA) as its switching parts. In this paper, the overall structure and electrical circuit scheme of the OLTC were designed on the...
This paper introduces the design of a Marx Generator that can generate high attitude pulses up to 25 kV and 2.5 kA. The pulses have a wave shape representative of that used to test High-altitude ElectroMagnetic (HEMP) filters against the pulse current injection (PCI) requirements. The rise time is 20 ns and the pulse width is 230 ns on a 10 Ω resistor. In the design, it was found that parasitic effect...
The Facility for Laboratory Reconnection Experiments (FLARE) is an intermediate laboratory experiment currently under construction at Princeton University by a consortium of five universities and two Department of Energy (DoE) national laboratories, located at the Princeton Plasma Physics Laboratory (PPPL). The goal of FLARE is to provide experimental accesses to new regimes of the magnetic reconnection...
In this study, we introduce an accurate capacitor-resistor model for nano-crossbar arrays that is to be used for power/delay/area performance analysis and optimization. Although the proposed model is technology independent, we explicitly show its applicability for three different nanoarray technologies where each crosspoint behaves as a diode, a FET, and a four-terminal switch. In order to find related...
Capacitance and tan δ measurements are usually carried out to check the healthiness of an insulation. Measuring equipment based on different methodologies to test insulation in cables, transformer bushings etc. are available. This paper presents the development of such a measuring equipment for a high voltage (HV) laboratory of a University. The design is divided into three parts as filter unit, test...
In this paper, we propose an algorithm to solve the balancing problem of multi-cell battery systems consisting in the equalization of all cells state of charge (SoC). A nonlinear cell model is presented and experimental LiFePO4 battery cell parameters are used. By considering the main cell nonlinear dynamics, ultimate balancing is guaranteed via state feedback. Output feedback versions of the proposed...
A new compact three-way Wilkinson power divider with low-temperature cofired ceramics (LTCC) technology is presented in this paper. This power divider was proposed by a simple structure based on lumped-element equivalent network and achieved a good performance. Within band of 1.27GHz-1.58GHz, all output ports insertion loss is less than 0.5dB, the input port return loss is less than −15dB and the...
This research has provided a new battery model for hybrid electric vehicle. To achieve an efficient and accurate model, exponential functions are used instead of electrical circuit elements (internal resistors and capacitors). To achieve this purpose, it is necessary to carry out the exact measurements on the output of battery in laboratory conditions and a comparison be performed between the voltage...
The voltage to damage a chip under the ESD test is often higher than several hundred volts. However, we have observed that the voltage below 6V still can damage the chip to induce the yield-loss of a product in the production line. It is because that the voltage is high enough to damage the components of the low voltage circuits (1.8V), but is still too low to turn on the ESD protection device.
No passado, devido a energização de contatores através de fontes em corrente alternada em circuitos de controle cujos cabos elétricos possuíam comprimento da ordem de quilômetros, era comum a ocorrência do efeito de colamento capacitivo. Nas recentes aplicações de relés microprocessados para acionamento e proteção de motores elétricos, uma variação do efeito de colamento capacitivo volta a aparecer...
The high power source which is included Electric-Double Layer Capacitors (EDLC) has been configured to generate power higher than limited power. Rated voltage of EDLC has low maximum value that's why it must need series-connection in high power applications. When EDLCs are series-connected, each cell has an unbalance voltage by each tolerance. Unbalance phenomenon is one of the facts reducing their...
In this paper a new single current controlled current conveyor trans-conductance amplifier (CCCCTA) based electronically tunable voltage-mode biquad filter is proposed. The proposed voltage-mode filter employs only one resistor and three capacitors as passive elements. It can simultaneously realize low pass (LP), band pass (BP), band reject (BR) and high pass (HP) filtering functions using single...
Large power three-level voltage source inverters with IGCTs are widely used in medium and large power drive systems now and have prospective future. Measures should be carefully taken to protect the inverter when over-current occurs due to every reason, especially that due to short circuit in the load or in the inverter itself. The short circuit process of the inverter with IGCTs is analyzed. With...
Simulation of grounded inductance (GI) andFloating inductance (FI) has been an important area ofanalog circuit research since simulated inductors findapplications in a number of analog circuit designs.Inductance simulation circuits using current conveyors(CCs) and current feedback operational amplifiers (CFOAs)have attracted significant attention in recent literature dueto the commercial availability...
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