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SiC-MOSFETs have attracting increasing attention because of their outstanding characteristics that contributes to high efficiency and high power density of power converters. However, compared to conventional Si-IGBTs, SiC-MOSFETs are susceptible to false triggering, because they tend to generate large switching noise due to ultrafast switching capability and have a lower threshold voltage in high...
Silicon carbide (SiC) MOSFETs have been widely studied in high frequency applications. The switching performance, however, is limited with the existence of the parasitic elements. One critical issue is the susceptibility of the gate-source voltage to the parasitic elements, rendering the possibility of spurious operation of the SiC MOSFETs. This paper conducts comprehensive investigations on the impact...
Soft-switching self-tuning H-bridge converters for inductive power transfer (IPT) systems with resonant current regulation are introduced. The proposed converters are controlled based on an amplitude modulation technique for resonant converters to regulate the transferred power in an IPT system. The switching operations of the converters are synchronized to the resonance current of the IPT system...
We present a decentralized control strategy that yields switch interleaving among parallel-connected dc-dc buck converters. The proposed method is based on the digital implementation of the dynamics of a nonlinear oscillator circuit as the controller. Each controller is fully decentralized, i.e., it only requires the locally measured output current to synthesize the pulse width modulation (PWM) carrier...
Analog-to-digital converters (ADC) in switching mode are used to convert the signals from multiple sources of the ADC means. It was considered appropriate, since it was believed that this provides a significant simplification of the hardware. Today, the advantage of hardware saving is negligible in compare with the loss of measurement accuracy because of the use of switching mode, which is unreasonably...
This paper explains a procedure on how to select resonant circuit components of a unique direct three-phase to single-phase AC/AC converter for a contactless electric vehicle (EV) charger. The topology has a fewer bi-directional switches than a matrix converter and consists of a resonant circuit to utilize a zero-current switching (ZCS) mechanism. The selection goal was to realize a working prototype...
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
This paper presents a computational analysis, by means of a compact model, of the electric response of an Ovonic Threshold-Switch device embedded in a circuit subjected to an oscillatory bias.
SiC MOSFETs are known to provide a better performance compared to Si IGBTs. However, they can also introduce undesirable behaviors like switching oscillations due to the existence of parasitic elements. In this paper, we introduce the turn-on and turn-off switching equivalent circuit models and validate these models with commercially available SiC MOSFETs. Based on the models, theoretical analysis...
The phenomenon of metal-insulator-transition (MIT) in strongly correlated oxides, such as NbO2, have shown the oscillation behavior in recent experiments. In this work, the MIT based two-terminal device is proposed as a compact oscillation neuron for the parallel read operation from the resistive synaptic array. The weighted sum is represented by the frequency of the oscillation neuron. Compared to...
The following paper presents an approach to gate charge control of a MOSFET used in low-side drive motor applications using pulse width modulation (PWM). Without gate charge control, ringing caused by di/dt effects on turn-on and dv/dt effects during the turn-off can result in narrowband radiated EMI that is very difficult to suppress. Suppressing narrowband EMI through the addition of suppression...
In this paper, it found that the low frequency oscillation phenomenon causing large inductor current and output voltage variations exists in the constant-on-time (COT) controlled boost converter, while the time constant of the output capacitor is below a critical value. The critical value is deduced, which is related to the main circuit parameters such as input voltage, inductance and load current...
In this paper1 a stability analysis sheds light into aspects of memristor circuit design, revealing a circuit theoretic technique for the stabilization of the NDR portion of the device DC characteristic. This type of studies supports the work of designers exploring memristor potential in electronics. Concepts from nonlinear dynamics theory allow us to gain a deep understanding of the dynamics of our...
This work presents the co-design and simulation of a self-excited MEMS-CMOS oscillator. The device consists of an electrostatic MEMS actuator, a DC source and a resistive circuit switched by the actuator's displacement. The MEMS device is modeled after an existing device. A CMOS circuit is proposed for the displacement detection and the switching mechanism. The oscillator is capable of sustaining...
The potential of the genetic clock is in its role to trigger consecutive logic reactions in sequential biological circuits. However, it is hard to directly create a square wave generator in the gene regulatory systems for use as a genetic clock. This research studies the design of a genetic clock generator based on combination of a genetic oscillator with a toggle switch via a dual repressor. This...
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 common widely-used arcing model for the simulation of very fast transient overvoltage(VFTO) caused by switching operations of disconnector switching(DS) in SF6 Gas Insulated Switchgear(GIS) involves only one single spark model in which the superimposition of transients caused by the previous restrike due to the travelling wave reflection and refraction is neglected. In this paper, simulation of...
Here, we will show how to simulate systems with sliding dynamics, also known as Filippov systems. The current simulation techniques have blocks, wrong solutions, and very long times when dealing with Filippov systems. We will study the case of a Wien bridge oscillator with a diode. The piecewise smooth model of the diode generates a sliding dynamics.
This paper discusses the problems which are the power consumption of gate drive circuit and voltage oscillation of source-to-gate voltage in the power converters using high-frequency power devices. The circuit parameters design were executed in terms of (i) power consumption of the gate drive circuit at FET and (ii) voltage oscillation of source-to-gate voltage at FET. As for (i), it is confirmed...
In the late 1990s and early 2000s, Carl Baum proposed the idea of generating moderate bandwidth electromagnetic waveforms using quarter-wave switched oscillators. After his initial conceptual proposition, it took several years to realize these systems, and many lessons were learned along the way. This article captures the details of the modeling and design methodologies that we have developed over...
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