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The loss contribution of a 2.3 kW synchronous GaN-HEMT boost converter for an input voltage of 250 V and an output voltage of 500 V was analyzed. A simulation model which consists of two parts is introduced. First, a physics-based model is used to determine the switching losses. Then, a system simulation is applied to calculate the losses of the specific elements. This approach allows a fast and accurate...
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...
In this paper, the switching flow-graph models are developed to study the nonlinear behavior of DC-DC switching converters. Based on the concept of virtual switches and virtual switching functions, switching flow-graph (SFG) model are created easily without complex mathematics. The SFG modeling technique is helpful for undergraduate students or beginners to understand how the switching converters...
The paper presents the topology and functioning of the model-based laboratory system to study the power electronic converters structure and execution and to evaluate their different duty modes of operation. Detailed description of the models of ac/dc, dc/ac, ac/ac and dc/dc virtual power converters and their auxiliary circuits are given. Learning possibilities and restrictions of the described software...
The paper deals with the automatic generation of global model of static converters without the description of their environment. The considered models are average and exact models (i.e. with ideal switches). These models are obtained by using a software tool named AMG (for Average Model Generator) with a priori on the control mode and behaviour of the static converter. In this paper, an extension...
Simulation tools for learning power electronics are grounded aimed to study the circuit structure and execution and to evaluate the working possibilities in different duty modes of operation. The power converter estimation factors, features and characteristics are evaluated. Detailed explanation of the models of AC/DC, DC/AC, AC/AC AND DC/DC power converters and their control circuits is given. The...
The paper derives an analytical state-space average-value model of the direct symmetric topology of an 18-pulse AC-DC rectifier. The dynamic characteristics of the rectifier are fully represented while the model is time invariant and computationally efficient. The developed model, validated with comparison of the resultant transient and steady state behaviors with those obtained from detailed simulations...
This paper presents a comprehensive assessment of small-signal stability for a ldquomore-electricrdquo aircraft power system consisting of a synchronous variable-frequency generator which supplies several power electronic controlled loads via an 18-pulse autotransformer rectifier unit (ATRU) for AC-DC conversion. Functional models for key power system components and loads are derived. Numerical tools...
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