Applications such as electrolysis, electrowinning, DC arc furnaces and plasma torches require high-current (several kA) power supplies at low-voltage levels (few hundreds of volts). In this study, conventional rectifier topologies (diode-and thyristor-based multi-pulse rectifiers with on-load tap changing transformer and chopper-rectifier) used for high-current, variable-voltage applications are reviewed along with recent advancements in the field. The main applications themselves are also discussed. Issues with conventional topologies are highlighted. Power quality techniques like passive and active filters are discussed for power factor and current harmonics compensation. Advanced medium-to high-frequency transformer-based topologies (with current and voltage source rectifiers) are discussed along with simulation results.

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High frequency inductor models are presented, suitable for circuit simulation with nonsinusoidal excitation and nonlinear loads. A numerical o r an analytical field theoretical analysis as well as measurements serue as basis f o r the generation of state space models o r equivalent circuits of different accuracy and minimized order. Verifications are performed by comparisons of simulated currents and voltages with measurements.

Absfrucf-A novel methodology and its implementation intoa computer based development tool for switched mode power supplies is described. The tool consists of a number of modules for topology and component selection, circuit, controller, magnetic component and thermal design, embedded into the multi domain simulator SIMPLORER. Core of the tool is the expert system shell CLIPS, which in conjunction with a knowledge base generates choice tables for comparisons and parametenEd simulation worksheets. In addition to the modules integrated into the shell, off-line tools for analysis of power electronic topologies and controller design based on MATHEMATICA supplement the tool CAE-WPS ' . A model based design optimiaer €or magnetic components with solenoidal or planar windings is accessible through SIMPLORER simulation sheets offering considerable improvements in respect to selected cost functions.