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High-voltage capacitor charging power supply (HV-CCPS) is an important part of the capacitive pulsed power system. This paper mainly focuses on the analysis, design and implementation of HV-CCPS, which employs the phase-shifted series resonant converter (PS-SRC) as topology. When PS-SRC operates at over-resonant state, it has three operation modes. The electric characteristics and boundary conditions...
This paper deals with the symbolic solution of the switched current circuits. As is described, the general principle of the transformation graph method can be used for finding admittance matrix of medium size networks and/or sub-networks. The admittance matrix is assembled from four submatrices after reduction each submatrix by partial reduction formula. There is described principle for decomposition...
Gene regulatory networks depict the interactions between genes, proteins, and other components of the cell. These interactions often are stochastic that can influence behavior of the cells. Discrete Chemical Master Equation (dCME) provides a general framework for understanding the stochastic nature of these networks. However solving dCME is challenging due to the enormous state space, one effective...
DC-DC converter is a variable structure control system inherent due to the characteristics of the power switch. Sliding mode control technology is ideally suited for variable structure control system. In this paper, the sliding mode controller is designed based on the hysteresis modulation. The sliding surface parameters and the width of the hysteresis loop are given. Finally, a simulation of BUCK...
Dynamics and stability control are the key factors to determine mode switch characteristics of multi-mode electro-mechanical transmission (EMT) which has been extensively applied in heavy-load vehicles as an innovative power-split transmission technology of hybrid electric vehicle. Based on cooperative work between the diesel engine with variable-speed governor and the generator with torque control,...
In this paper, we first propose a static analysis approach to estimate the maximum value of the worst-case latency of all possible communications in a Chip Multi-Processor (CMP) with a 2D-Mesh Network-on-Chip (NoC), which is called the Worst-case Inter-core Communication Latency (WICL). Then the Hop-based Priority scheduling approach is proposed for a 2D-Mesh NoC to improve its WICL. Our experimental...
A new method for modeling switched-linear systems is presented: switching devices are modeled ideally using parametrized curves, and an efficient implementation for real-time simulation is proposed. Experiments on a rectifier topology for traction converters demonstrate the methods performance in terms of accuracy, stability and execution time, with a 50us step-size.
The paper presents a detailed analysis of the asymmetrical half-bridge PWM converter. Due to its advantages with regard to efficiency, power density and cost the topology gains increasing attention. Recent publications propose a rough but simple converter model which helps to understand the basic converter functioning. A comparison between measured and simulated waveforms, however, reveals its insufficiency...
In literature three phase voltage source inverter models are based on one specific application considering only a limited number of switching state combinations and assuming certain load properties. This paper suggests a model considering all practical switching state combinations. Time dependent load behavior is also included in the model.
The aim of this work is to describe the general design procedure of a Modular Multilevel Converter (MMC) applied as an Active Front-End (AFE) for a magnet supply for beam accelerators. The dimensioning criteria for the converter and the dc-link capacitance are presented and the grid transformer requirements are set. Considering the converter design, the arm inductance calculation is based on the specifications...
A modified Z-source dc-dc converter is proposed in this paper. Compared with the conventional Z-source dc-dc converter, the proposed converter can obtain higher voltage gain with lower voltage stresses of switch and the impedance network capacitor and operate with wide-range load. Therefore, the proposed Z-source dc-dc converter not only has lower cost but also has smaller weight and size. The operating...
This paper describes a relatively simple way of allowing a brain model to self-organise its concept patterns through nested structures. Time is a key element and a simulator would be able to show how patterns may form and then fire in sequence, as part of a search or thought process. It uses a very simple equation to show how the inhibitors in particular, can switch off certain areas, to allow other...
This paper proposes the switching control method based on the controller performance assessment. The switching mechanism is based on the estimated controller performances of all prepared candidate controllers. The accepted controller must have the best estimated performance of all controllers. Each controller performance is estimated by the gain of the controllers. Finally, the effectiveness of the...
The state-plane control consists on making use of the state-plane to monitor the resonant tank variables in the Series Resonant Converter (SRC). Based on this technique, this article will propose and analyze a novel control strategy that is able to step up and down the voltage in a SRC. Both analytical and simulation results are provided with and without a high frequency transformer.
With the introduction of a time-of-use (TOU) tariff structure by Eskom, the implementation of projects that shift load from peak TOU times to times of the day when electrical energy is less expensive has increased. To enable load shifting on mine dewatering pumps, preparation before and recovery after peak TOU is needed for effective results. This induces a preparation- and comeback load in the standard...
This paper addresses estimating the far-field radiated emissions performance, at 10m, from three coupled microstrip lines, in which the coupling length is 5cm, and in which the risetimes of the propagating signals are 2ns. The load for each microstrip line is a 0.01pF capacitive load, and the signaling on the three lines is unipolar, with the propagating voltages switching between 0V and 3V. The nominal...
Silicon PiN diodes are the most widely used rectifying technology in industry especially in voltage source converters. The PiN diodes are usually used as anti-parallel diodes across silicon IGBTs where they conduct current in the reverse direction as the current commutates between the phases of the converter. They tend to generate a considerable amount of energy losses during the turn-OFF transient...
Passive three-phase rectifier circuits are very popular for ac-dc power conversion. However, they do not have the capability to reverse the power flow, which is demanded by some recent potential smart-grid applications, such as vehicle-to-grid (V2G) power transfer. As an alternative, this paper analyzes the behavior of three-phase ac-dc matrix converters. Among the modulation strategies that minimize...
A growing need for more efficient generation, distribution and conversion energy intensively drives exploration of new power converters topologies. The paper compares key design parameters of multilevel and three-level boost converters based on fly capacitor and clamping diodes. Main attention has been paid to three-level boost converter with clamping diode structures along with features under operation...
Paper analyzes substantial Coss behavior differences of FETs using super-junction Si, SiC and GaN technologies versus traditional Si process and suggests new practical models for power losses optimization. These models applied to derive normalized ZVS conditions and boundaries for popular PWM ZVS topologies allowing efficiency optimization at wide operating conditions.
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