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Research on Sneak Circuit of Resonant Soft-switching Converter

Author: DaiZuo
Tutor: QiuDongYuan；ZhangBo
School: South China University of Technology
Course: Power Electronics and Power Drives
Keywords: Resonant soft-switching converter Phase-shifted full-bridge ZVS converter Latent circuit phenomenon Graph Theory
CLC: TM46
Type: Master's thesis
Year: 2011
Downloads: 74
Quote: 0
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Abstract


In the field of high-tech , the switching converter miniaturization and high efficiency has been the pursuit of the goal , the soft-switching technology can not only improve the efficiency of switching converter , and can increase the switching frequency of the converter resonant soft switching converters because of its high frequency advantages of high efficiency , high power density , small stress of switching devices and low noise and a wide range of applications, an important position in the process of increasing miniaturization , power efficient . Recently, the researchers found that power electronic converter is especially resonant switched-capacitor converter a latent circuit phenomenon, the operating characteristics of the converter so it greatly changed , converter and reliable security is affected . Resonant soft-switching converter topology and composition with resonant switched-capacitor converter similarities , there is the possibility of latent circuit , which will affect the overall performance and reliability of the converter . In this paper, the specific phase to shift full-bridge ZVS converter for the study, to analyze its latent circuit phenomenon and its characteristics . This paper the work is as follows : ( 1) was established based on the the multiple graph theory model to study the potential path of the phase-shifted full-bridge ZVS converter , has summarized a false path of criterion to exclude false path to uniquely identify a converter in the presence of potential paths , and then traverse the combination of these potential paths to obtain converters all latent circuit modal path . ( 2 ) to determine the latent circuit work each latent circuit occurred modal analysis and derivation of the conditions of the latent phase-shifted full-bridge ZVS converter circuit phenomenon occurred with dead time - energy coordinate system , and reveals the the sneak circuit appears converter work law . The results showed that latent circuit conditions and resonant inductor , resonant capacitor , the load resistor , the input voltage and the switching cycle . ( 3) a variety of phase-shifted full-bridge ZVS converter phenomenon sneak circuit analysis of experimental verification , the experimental results verify the correctness of the above analysis .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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