An ultra efficient composite modular power delivery architecture for solar farm and data center
An ultra efficient composite modular power delivery architecture for solar farm and data center
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适用于太阳能发电场和数据中心的超高效复合模块化电力传输架构
DOI：
10.1109/apec.2018.8340991
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Chenhao Nan
中科院分区：
文献类型：
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作者：
Dong Cao;X. Lyu;Yanchao Li;Ze Ni;Jalen Johnson;Shuai Jiang;Chenhao Nan
本文提出了一种超高效复合模块化供电架构（COMPDA），可用于 DC-DC、DC-AC、AC-DC 和 AC-AC 应用。所提出的架构具有非常好的模块结构，每个模块中的器件具有相同的电压和电流应力。当用于高转换比DC-DC应用时，器件电压应力与低电压侧相同，器件电流应力与低电流侧相同。与降压、飞跨电容器多级或模块化多级DC-DC转换器相比，所提出的架构具有低得多的总器件功率或电流应力，这意味着半导体芯片面积显着减少。在操作期间，模块串联连接以维持高电压，并联连接以泵送高电流。通过正确设计COMDA中的谐振回路，所有开关器件都可以实现零电流开关或零电压开关。部分功率调节器可以集成在所提出的架构中，其中只需要处理最少量的功率即可实现输出电压的精细调节。通过正确控制模块的操作，COMDA还可以用作高升压比DC-AC逆变器或高降压比AC-DC整流器，同时保留软开关特性，特别适合太阳能发电场和数据中心应用。当将 COMPDA 应用于单相 DC-AC 或 AC-DC 应用时，仅需要最少量的直流母线电容器，因为能量存储的需求已降至最低，并且不再需要高压直流母线。为了展示 COMPDA 的优势，从所提出的架构派生出的一种特殊的未调节案例已用于 48 V-8 V DC-DC 数据中心应用，也称为开关槽转换器。最后，构建并测试了基于 GaN 的原型，以验证理论分析。所提出的转换器在开关频率 253 kHz 和功率密度约为 750W/inch3 下可实现 98.55% 的峰值效率。
This paper presents an ultra-efficient composite modular power delivery architecture (COMPDA) that is able to be used for DC-DC, DC-AC, AC-DC, and AC-AC applications. The proposed architecture has very good module structure, the devices in each module have the same voltage and current stress. When it is used for high conversion ratio dc-dc applications, the device voltage stress is the same with the low voltage side, and the device current stress is the same with the low current side. Compared with the buck, flying capacitor multilevel or modular multilevel dc-dc converters, the proposed architecture has much lower total device power or current stress, which means a significant semiconductor chip area reduction. During the operation, the modules are connected in-series to sustain the high voltage and connected in-parallel to pump the high current. By properly design the resonant tank in the COMPDA, all the switching devices could achieve zero current switching or zero voltage switching. A partial power regulator could be integrated in the proposed architecture, where only a minimum amount of power needs to be processed in order to achieve the output voltage fine regulation. By properly control the operation of modules, the COMPDA can also be used as a high boost ratio DC-AC inverter or high step-down ratio AC-DC rectifier while keeping the soft-switching features, which are specially suitable for solar farm and data-center application. When apply the COMPDA to single-phase DC-AC or AC-DC applications, only a minimum amount dc-link capacitor is needed since the needs of energy storage is minimized, and there is no high voltage dc-link requirement anymore. In order to show the benefits of the COMPDA, one special unregulated case derived from the proposed architecture has been used for 48 V–8 V DC-DC data center application, which is also named switched-tank converter. Finally, a GaN based prototype is built and tested to verify the theoretical analysis. The proposed converter can achieve the peak efficiency at 98.55% under switching frequency 253 kHz and power density is ∼750W/inch3.