Wide-input high power density flexible converter topology for dc-dc applications
Wide-input high power density flexible converter topology for dc-dc applications
复制标题
适用于 DC-DC 应用的宽输入高功率密度灵活转换器拓扑
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Gerfer
中科院分区：
文献类型：
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作者：
P. Jain;A. Prodic;A. Gerfer
本文介绍了一种高度灵活的2相降压DC-DC变换器拓扑结构，该拓扑结构设计用于广泛的负载点（PoL）应用。与传统使用的2相交错降压解决方案相比，新的宽输入飞跨电容多电平转换器具有更小的整体体积和更好的功率处理效率，这是通过降低其组件上的电压摆幅实现的。与其他多级解决方案相比，新的拓扑结构具有更高的灵活性，允许操作条件相关的拓扑结构的变化，以实现效率优化。此外，实现开关所需的硅面积小于其他解决方案的硅面积，因为所有晶体管的额定值为输入电压的1/2，进一步有助于尺寸减小和功率处理效率提高。实验验证了新拓扑的优点，设计了宽输入范围（3 V ≤ Vin ≤ 48 V）、宽输出范围（1 V ≤ Vin ≤ 12 V）、输出功率Pout ≤ 72 W、开关频率800 kHz的分立式实验样机。结果表明，所引入的拓扑结构需要比传统的2相交错降压小约33%的电感和33%的输出电容，同时在整个工作范围内具有更高的功率处理效率。
In this paper a highly flexible 2-phase step-down dc-dc converter topology designed for a wide range of point-of-load (PoL) applications is introduced. The new wide-input flying-capacitor based multi-level converter has smaller overall volume and better power processing efficiency than the conventionally used 2-phase interleaved buck solution, achieved through the reduction of voltage swings across its components. Compared to other multi-level solutions the new topology has much higher flexibility, allowing operating-condition dependent changes of the topology for efficiency optimization. Also, the silicon area required for the implementation of the switches is smaller than that of the other solutions, since all transistors are rated at ½ of the input voltage, further contributing to size reduction and power processing efficiency improvements. The advantages of the new topology have been experimentally verified with a wide input range, 3 V ≤ Vin ≤ 48 V, wide output range, 1 V ≤ Vout ≤ 12 V, output power Pout ≤ 72 W, 800 kilohertz switching frequency discrete experimental prototype. The results show that the introduced topology requires about 33% smaller inductor and 33% smaller output capacitor than the conventional 2-phase interleaved buck, while having higher power processing efficiency over the entire range of operation.