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Diode–capacitor-based dc–dc converters provide a simple and low cost solution for high step-up voltage regulation in solar and fuel cell generation. Transient modeling analysis reveals their worse influence of nonlinear and nonminimum-phase system characteristic due to right-half-plane (RHP) zero, especially in high voltage gain application. However, the process of energy transfer for diode–capacitor-based...
In order to improve the efficiency of high voltage power supply for electron beam welder, the characteristics of LCC series parallel resonant converter with capacitive filtering are studied in this paper, and the circuit model of LCC resonance in discontinuous current mode(DCM) is established. The working mode of the converter is analyzed by mathematical time domain analysis method, and the mathematical...
In this paper, we illustrate, through examples, a novel graph-based modeling technique of two-state (on-off) PWM power converters. Differential equations of power converters are derived by inspection, based on two incident matrices, β(u) and J(u). We associate to each circuit (on, u = 1, or off, u = 0, circuits) a digraph and identify current loops (inductor-capacitor, voltage source-inductor, current...
A CMOS synapse design is presented which can perform tunable asymmetric spike timing-dependent learning in asynchronous spiking neural networks. The overall design consists of three primary subcircuit blocks, and the operation of each is described. Pair-based Spike Timing-Dependent Plasticity (STDP) of the entire synapse is then demonstrated through simulation using the Cadence Virtuoso platform....
Memelements — circuit elements with memory — serve novel applications in several technical disciplines. Due to similar functionalities to synapses, they are especially suitable for neuromorphic circuits. Physical and chemical phenomena in the nano-scale lead to the unique information storage characteristic of these elements. Fabrication of devices with memory considering a particular desired functionality...
Single-phase capacitor induction motors are the most common low cost solutions for household appliance. An alternative high efficiency motor is the novel three-winding series-connected single-phase motor. This paper proposes the simulation and analysis of the fractional order model of the novel motor with full load and no load. A transfer function with a fractional derivative order has been selected...
Nowadays, many studies on LVDC (Low Voltage Direct Current) distribution system are underway as the future solution for reliable power system network. This new concept in power distribution is expected to improve power system efficiency, reliability and uninterrupted power supply capability when it is implemented. This paper is based on Bipolar LVDC distribution system and it focuses on analysis of...
This paper is concerned with the process of current commutation and overvoltage protection in matrix converters. The mechanisms involved in the commutation process and clamp circuit are described and simulation waveforms are presented. A four-step semi-soft commutation strategy is described that this technique relies on knowledge of the output current direction and the ability to control the direction...
Recent computing systems consume more than several hundred watts of power and a robust PDN design is critical to minimize power/ground (P/G) voltage fluctuation and get stable performance. In most cases, the IC package (PKG) PDN determines mid-frequency P/G noise characteristics. The PDN of our target IC package consists of more than ten thousands staggered microvias and tens of layers, representing...
The main function of the DC-link decoupling capacitors, integrated between the voltage source and the power devices, is to suppress the effect of the parasitic inductors and minimize the voltage overshoot. Besides, decoupling capacitors can also affect the electromagnetic interference frequency spectra. In this paper, the elïects of decoupling capacitors are explained from the time-domain and the...
In this paper the Parameters of a Double Layer Super Capacitor (DLC) Bank are experimentally identified online using Recursive Least Squares (RLS). In order to extract the signals suitable for the RLS a proper signal processing system has been implemented. Results have been verified with those obtained with an off-line common technique applied to the 2-branch model of the DLC.
This paper presents a space vector pulse width modulation and proportional resonant control scheme for single-phase three-level rectifier for electric railway traction applications. The proposed SVPWM modulation has been tailored to the single-phase rectifier without an additional PLL. Moreover, vectors and vectors sequence have been carefully designed to achieve neutral point voltage balance. Based...
This paper is on the study of double coupled oscillators, where two cross-coupled differential oscillators share the same bias current. Without external coupling, competition for bias current happens, and the one with a higher Q can grab most of the current, and the other one is starved to death. With external coupling, a beat pattern is generated and the beat frequency is strongly related to the...
Using a new DC offset compensation method, a fully differential track and hold circuit is presented. It stores an amplified version of the offset during the hold phase, which is used in attenuated fashion during the track phase to compensate offset. This scheme is less sensitive to charge injection and other errors than conventional offset compensation schemes. Experimental results of a test chip...
A significant advancement in computational science and the development of various simulation based software have replaced the necessity of testing circuit construction practically. This simulation software can model, design, analyze and synthesize various complex circuitries. Usage of software in basic designs has made the circuit building and testing process more convenient and less expensive. Software...
In this work, we propose a simulation methodology that incorporates derating models of decoupling capacitors for power integrity analysis. The construction of the derating models of decoupling capacitors is based on the impedance measurement and curve fitting method. Three approaches of impedance measurement are compared and the most accurate one is selected to build the derating models. The curve...
With the rapid increase in the number of electric vehicles, V2G model has been widely concerned. In this paper, the three-level LLC resonant DC/DC converter applied to V2G is chosen as the research object. The charging process of the circuit is introduced from the basic principle of the circuit. Afterwards, MATLAB/Simulink is used to simulate and analyze the bifurcation phenomenon. Finally, it controls...
Super-capacitor with the features of high power density and long life is used as a new kind of energy storage methods for electric bus. State of charge (SOC) indicates the remaining power, which is very important for super-capacitor bus. In this paper, a SOC estimate method based on sliding mode observer is studied. The design of sliding mode observer is based on the “two-branch” equivalent circuit...
This paper studies the conducted electromagnetic interference (EMI) problems in a DC/DC switched-mode power supply (SMPS) with semi-isolated topology. A high frequency circuit simulation model is firstly established to predict the conducted emissions of this power supply. Then the common mode (CM) and the differential mode (DM) conducted emission mechanisms of this power supply are analyzed in detail...
In Indonesia, there are many capacitor bank installed to regulate the nominal voltage. Currently, the Recovery Voltage (RV) data related to the capacitor bank switching is unavailable, whereas this data is very important to analyze Circuit Breaker (CB) performance to understand whether it will success to interrupt the current or not. In addition, if the CB cannot retain the RV, it will degrade the...
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