The zero Voltage switching (ZVS) critical conduction mode (CRM) buck Converter With tapped-inductor
The zero Voltage switching (ZVS) critical conduction mode (CRM) buck Converter With tapped-inductor
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发表时间：
2005
影响因子：
6.7
通讯作者：
Jong-Hu Park;Bo-Hyung Cho
中科院分区：
文献类型：
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作者：
Jong-Hu Park;Bo-Hyung Cho
临界导通模式（CRM）控制在极高/低压转换应用中存在开关损耗和主开关导通损耗增加等缺点。本文提出了一种带抽头电感的CRM降压变换器来克服这些问题。在该变换器中，有源开关和二极管均通过开关寄生电容与滤波电感之间的谐振实现软开关操作。此外，抽头电感的工作降低了主开关的峰值电流，从而降低了主开关的导通损耗和开关损耗水平。因此，这种带有CRM控制的抽头电感方案减轻了严重的功率压力，提高了器件利用率。对于所提出的变换器的评估，本文给出了变换器的工作分析和设计步骤，并给出了50w样机的硬件验证，该样机的最大工作频率为70khz。最后，提出了一种将CRM操作与基本抽头电感变换器相结合的新拓扑族。
The critical conduction mode (CRM) control has some disadvantages such as the increase of switching loss and conduction loss of the main switch at extreme high/low voltage conversion applications. In this paper, a CRM buck converter with tapped inductor is proposed to overcome these problems. In this converter, both the active switch and the diode have soft switching operation by the resonance between the switch parasitic capacitors and the filter inductor. Furthermore, the peak current of the main switch is reduced by tapped inductor operation, thus the conduction loss and switching loss levels of the main switch are lowered. Consequently, this tapped inductor scheme with CRM control alleviates the severe power stress and enhances device utilization. For the proposed converter evaluation, this paper provides the operation analysis and design procedures of the converter, and also presents the hardware verification for a 50-W prototype operating at maximum 70 kHz. Finally, a new topology family derived by combination of CRM operation with the basic tapped-inductor converter is included.