Abstract
The aim of this study is to propose a high voltage lift isolated full bridge dc-dc converter. The proposed converter consists of an isolation transformer a low turn ratio to obtain high step up voltage gain. The secondary of the transformer connected with two boosting capacitors which connects parallel when power switches switch on period and discharged in series during the switch off period. In addition full bridge converter on primary side consists of clamping diode and capacitor, leakage energy is recycled there by improving conversion efficiency. The proposed circuits simulated using PSIM software form input voltage of 48V, an output of 410 V obtained. These results and operations experimented and validated by implementing in hardware model at 20/40 Vdc, 20 Watts.
Highlights
The conventional isolated converters like fly back, forward, push-pull and single ended primacy inductor converter can achieve high voltage gain by adjusting the turn ratio of the transformer
Further the leakage inductance energy in the transformer causes high voltage stress on the switches switch reduces the system efficiency which explained by Tsorng-Juu et al (2013), Changchien et al (2010) and Wang et al (2004)
The non-isolated converters can be used with the coupled inductor technique, cascade technique are can refer the authors Araujo et al (2010) and Chen et al (2011) and switched-inductor and switched capacitor techniques given by Axelrod et al (2008) and Kuo et al (2010) with appropriate duty ratio to obtain high voltage gain
Summary
The conventional isolated converters like fly back, forward, push-pull and single ended primacy inductor converter can achieve high voltage gain by adjusting the turn ratio of the transformer. The non-isolated converters can be used with the coupled inductor technique, cascade technique are can refer the authors Araujo et al (2010) and Chen et al (2011) and switched-inductor and switched capacitor techniques given by Axelrod et al (2008) and Kuo et al (2010) with appropriate duty ratio to obtain high voltage gain. These converters not met the safety standards needed for galvanic isolation. These converters voltage lift techniques boost type converters integrates with a transformer to obtain high voltage gain explanation given by Kuo et al (2010) and Lin et al (2009)
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