Two-Transformer Current-Fed Converter With a Simple Auxiliary Circuit for a Wide Duty Range

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Till now, various types of current-fed converters have been developed, and they exhibit good performance in isolated step-up applications. However, they have a common limitation in that the duty cycle must be larger than 0.5 for a proper operation, which guarantees a conducting path for the boost-inductor current. The limited duty cycle causes an inrush current at start-up and it makes it difficult to regulate the output voltage in a light-load condition. Although various auxiliary circuits have been developed that can be solutions for a duty cycle below 0.5, they increase the size and complexity of the total circuit. To relieve these problems, a new two-transformer current-fed (TTCF) converter, which can be operated along a wide duty cycle range with a simple structure, is proposed in this paper. In the TTCF converter, a magnetizing inductor of the transformer acts as a boost inductor, thus no additional boost inductor is needed. Moreover, only one auxiliary diode is employed for operation with a duty cycle below 0.5. Therefore, the proposed converter can be promising for isolated step-up applications with a simple structure.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2011-07
Language
English
Article Type
Article; Proceedings Paper
Citation

IEEE TRANSACTIONS ON POWER ELECTRONICS, v.26, no.7, pp.1901 - 1912

ISSN
0885-8993
URI
http://hdl.handle.net/10203/97536
Appears in Collection
GT-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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