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A lifetime analysis was performed on the DC-link capacitor of a photovoltaic power-processing system composed of a boost converter in the first stage. It was investigated how the switching frequency and ripple current design choice affect the capacitor lifetime. Through an electro-thermal modeling, the capacitor operating condition was obtained for various levels of power processing, based on a real...
This paper presents a design methodology for isolated Zero Voltage Switching Phase-Shifted (ZVS-PS) DC/DC converters, applied to Double Half-Bridge (DHB) converter as well as to the well-known Full-Bridge (FB) converter. Here, the DHB topology is introduced as an alternative to the FB, presenting an additional feature of operating ZVS over the entire load range, regardless of the duty-cycle, from...
Currently research efforts are employed in algorithms, techniques and methods for static converters design, mainly exploring the minimization of volume, losses and costs. Taking into account the previous considerations, this work presents a computational tool to perform quickly and effective the design of static converters having as objective function to minimize its volume, losses, and cost. It was...
This paper proposes an active method to balance the voltage and to filter low-order current harmonics on the DC-link Bus capacitors of a three-phase half-bridge transformerless UPS. These low-frequency current components occur due to utility unbalanced voltage conditions or even under the connection of non-linear and/or unbalanced loads. They increase the DC bus capacitors losses and also may cause...
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