Consideration for Abnormal Phenomenon in Common-Source type Active-clamped Forward Converter with Self-driven Synchronous Rectifier

Many switching converters use soft-switching techniques with an active-clamp snubber so as to reduce switching surge and common-mode noise. In particular, the common-source type active-clamped forward converter is known as an effective circuit topology for common-mode noise reduction. On the other h...

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Bibliographic Details
Main Authors: Fukushima, K., Hashimoto, T., Ninomiya, T., Segawa, T.
Format: Conference Proceeding
Language:English
Subjects:
Acoustic noise
Circuit noise
Circuit topology
DC-DC power converters
Diodes
Noise reduction
Rectifiers
Snubbers
Surges
Switching converters
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Summary:Many switching converters use soft-switching techniques with an active-clamp snubber so as to reduce switching surge and common-mode noise. In particular, the common-source type active-clamped forward converter is known as an effective circuit topology for common-mode noise reduction. On the other hand, replacing the output rectifying diodes with synchronous rectifier circuits, the power efficiency can be improved in the DC-DC converter with low-voltage and large-current output. Furthermore, the self-driven synchronous-rectifier circuits are generally used because of isolation and simple structure of their gate-driving circuits. However, for this common-source type active-clamped forward converter with self-driven synchronous rectifiers, it has been recently noticed that an abnormal phenomenon such as the inductor-current oscillation and the acoustic noise generation in the transformer occur in some conditions. This paper discusses the above-mentioned abnormal phenomenon. The cause of the abnormal phenomenon is examined and its occurrence condition is clarified
ISSN:0275-0473
2158-5210
DOI:10.1109/INTLEC.2006.251587