An Interleaved Series-Capacitor Tapped Buck Converter for High Step-Down DC/DC Application
An Interleaved Series-Capacitor Tapped Buck Converter for High Step-Down DC/DC Application
复制标题
用于高降压 DC/DC 应用的交错串联电容抽头降压转换器
DOI：
10.1109/tpel.2018.2877309
复制
发表时间：
2019
影响因子：
6.7
通讯作者：
S. Chakraborty
中科院分区：
文献类型：
--
作者：
Lanhua Zhang;S. Chakraborty
高降压DC/DC转换器广泛应用于电信和现代工业应用中。由于降压比高，传统的降压转换器不能提供令人满意的性能。为了解决这个问题，已经提出了许多新的拓扑结构来提高高降压DC/DC转换器的性能，例如串联电容Buck（SC-Buck）转换器、三电平Buck转换器、抽头电感Buck转换器和LLC谐振转换器。本文将SC-Buck变换器的两次降压优点和串联电容抽头Buck（SC-TaB）变换器的零电压开关优点结合起来，提出了一种新的拓扑结构：交错串联电容抽头Buck（ISC-TaB）变换器。为了分析建议ISC-TaB转换器的性能，工作原理进行了讨论，并推导出的电压转换比。此外，为了指导设计过程和优化，所提出的ISC-TaB的电流波形和电压波形进行了推导。为了验证所提出的ISC-TaB的性能，所提出的ISC-TaB变换器和传统的两相串联电容抽头降压变换器（2 ph-TaB）的硬件原型的设计和测试。该应用面向电信应用，具有48 V输入和3.3 V/20 A输出。并对两种变换器的测试结果进行了比较。提出的ISC-TaB的峰值效率为95.6%，并且ISC-TaB在所有负载范围内的效率比2 ph-TaB至少高1%。
High step-down dc/dc converters are widely utilized in telecom and modern industrial applications. Due to the high step-down ratio, conventional Buck converter cannot provide satisfactory performance. To solve this problem, quite a few new topologies have been proposed to improve the performance of high step-down dc/dc converters, such as series-capacitor Buck (SC-Buck) converter, 3-level Buck converters, tapped inductor Buck converters, and LLC resonant converters. In this paper, the twice step-down benefit of SC-Buck converter and the zero-voltage switching benefit of series-capacitor tapped Buck (SC-TaB) converter are combined together to propose a new topology: interleaved series-capacitor tapped Buck (ISC-TaB) converter. To analyze the performance of the proposed ISC-TaB converter, the operation principles are discussed and the voltage conversion ratio is derived. In addition, to guide the design procedure and optimization, the current waveforms and voltage waveforms of the proposed ISC-TaB are derived. In order to verify the performance of the proposed ISC-TaB, hardware prototype of the proposed ISC-TaB converter and conventional two-phase series-capacitor tapped Buck converter (2ph-TaB) are designed and tested. The application is targeted at telecom with 48-V input and 3.3 V/20 A output. The test results are compared between these two converters. A peak efficiency of 95.6% is achieved on the proposed ISC-TaB and the efficiency of the ISC-TaB over all load range is at least 1% higher than that of 2ph-TaB.