Abstract：In high voltage application, there are serious switch losses in the two-switch Buck- Boost converter when both switches are switching in high frequency; while sophisticated control logic and complex compensation technique are needed for step-up/down smooth transitions when single switch scheme is used. In this paper, based on synchronous control scheme, the two-switch Buck-Boost converter adopting coupling inductor for alleviating switch losses is discussed. An asynchronous control scheme is proposed to reduce the core loss of synchronous control method with no increase of diode reverse-recovery losses. With the same conditions, comparisons between the two control schemes including theoretical calculation and experiment are illustrated. It is proved that the asynchronous control scheme could not only alleviate the diode reverse recovery losses, reduce the equivalent current ripple of coupling inductor, but also guarantee the smooth transitions between step-up and step-down.
杨晨, 谢少军, 毛玲, 秦岭. 高输入电压双管Buck-Boost变换器控制策略研究[J]. 电工技术学报, 2014, 29(4): 70-78.
Yang Chen, Xie Shaojun, Mao Ling, Qin Ling. Research on Control Strategy of Two-Switch Buck-Boost Converter for High Voltage Application. Transactions of China Electrotechnical Society, 2014, 29(4): 70-78.
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2014, Vol. 29 
