دانلود رایگان مقاله A Zvzcs Full Bridge Converter With High Voltage Gain By Solar Energy Source

دانلود رایگان مقاله A Zvzcs Full Bridge Converter With High Voltage Gain By Solar Energy Source

 

APRIL 2014

INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH

A Zvzcs Full Bridge Converter With High Voltage Gain By Solar Energy Source

INTRODUCTION
Recently, the demand for dc/dc converters with high voltage gain has increased because they are required as an interface system between the low voltage sources and the high voltage load which requires higher voltage. This high voltage gain dc to dc converter find applications in electric vehicles, uninterruptible power supplies, fuel cells, and photovoltaic systems [1]–[6]. A conventional boost converter is often used in step-up applications due to its simple structure and low cost. However, it is not suitable for high step-up applications. This is because the conventional boost converter requires an extreme duty cycle to obtain high-voltage gain and its voltage gain is limited due to its parasitic components [11]. The reverse-recovery problem of the output diodes is another important factor in dc/dc converters with high voltage gain. In order to remedy these problems, high step-up dc–dc converters using coupled inductors have been suggested in [9] and [10]. However, they have parasitic oscillations across the switches and diodes. The current-fed converters are often used in high step-up applications due to their inherent low input current ripple characteristic and high-voltage gain [8], [12] but here the voltage stresses of the switches are serious. In order to clamp the voltages across the switches and provide zero-voltage switching (ZVS) features, active snubbers are often employed. The snubbers require additional switches and cause additional conduction losses. As a result, the system efficiency decreases. To remedy these problems, many topologies have been proposed that is the voltage-fed converters such as phase-shift full-bridge (PSFB) converters, which are widely used, show low-voltage stress of the switching devices.

 

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