New Modeling Method and Design Optimization for a Soft-Switched DC–DC Converter
New Modeling Method and Design Optimization for a Soft-Switched DC–DC Converter
复制标题
软开关 DC-DC 转换器的新建模方法和设计优化
DOI：
--
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
Yanfei Liu
中科院分区：
文献类型：
--
作者：
Liang Jia;Srikanth Lakshmikanthan;Xin Li;Yanfei Liu
高性能云计算利用数据中心的集群CPU和GPU服务器，实现了人工智能（AI）、自动驾驶汽车、大数据分析、物联网（IoT）等许多关键的未来技术。为了提高电源效率和基础设施的灵活性，计算行业正在采用54 VDC为开放计算机架中的服务器供电。本文提出了一种新的软开关dc-dc变换器建模技术，该技术适用于指导不同应用的优化设计，例如新型开放式计算机架的54 V到负载点（PoL）。为了提高模型的精度和降低模型的复杂性，本文提出了一种基于降阶线性微分方程（LDE）的建模技术来发现以下问题：1)涉及输出电感的油箱谐振；2)输出电流纹波及其对功率效率的影响；3)适当的软开关准时控制；4)独特的重载下放血方式；5)变换器的输出功率能力；元件公差分析及其对变流器性能的影响。通过对功率损耗的估计，为基于该建模技术的参考设计和设计改进提供了设计指南。采用该方法，可以获得较高的效率估计精度。仿真和实验结果验证了54-1.2 V 25a dc-dc变换器原型的建模技术。
High-performance cloud computing enables many key future technologies such as artificial intelligence (AI), self-driving vehicle, big data analysis, and the Internet of things (IoT), using clustered CPU and GPU servers in the datacenter. To improve the power efficiency and the infrastructure flexibility, the computing industry is adopting 54 VDC to power the servers in the open compute racks. In this paper, a new modeling technique for a soft-switched dc–dc converter is presented and suitable to guide optimal design in different applications, for example, 54 V to point of load (PoL) for the new open compute rack. To improve the model accuracy and reduce the complexity, this paper proposes a reduced-order linear differential equation (LDE) based modeling technique to discover the following: 1) the tank resonance involving the output inductor; 2) the output current ripple and its impact on power efficiency; 3) the proper on-time control for soft switching; 4) the unique bleeding mode under the heavy load; 5) the output power capability of the converter; and 6) component tolerance analysis and impact on the performance of the converter. With the power loss estimation, design guidelines are provided for a reference design and design improvement based on this new modeling technique. Using the proposed method, great accuracy can be expected in the efficiency estimation. Simulation and experimental results are provided to verify the modeling technique in a 54–1.2 V 25 A dc–dc converter prototype.