Adaptive On-Time Control for High Efficiency Switched-Tank Converter
Adaptive On-Time Control for High Efficiency Switched-Tank Converter
复制标题
高效率开关储能变换器的自适应导通时间控制
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Shuai Jiang
中科院分区：
文献类型：
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作者：
Yanchao Li;X. Lyu;Ze Ni;Dong Cao;Chenhao Nan;Shuai Jiang
开关振荡电路转换器（STC）概念可以利用宽带隙器件的优点。特别适用于GaN/SiC器件。本文提出了一种改进的STC与独立的谐振支路和及时控制的方法，以实现效率的提高。由于STC依靠谐振工作来达到高效率，因此需要研究和解决不同谐振回路中谐振回路不匹配所引起的问题。研究表明，在最严重的情况下，由不匹配的谐振槽引起的问题不仅损害STC的效率，而且会对STC造成不希望的损害。因此，仅使用两个互补控制信号（50%占空比）的旧的简单控制方法不再足够好。因此，一种改进的STC以及自适应导通时间控制方法已被提出，以确保软开关和高效率的STC操作。一台1.2kW的6：1转换比的样机验证了所提出的控制方法的有效性。实验结果表明，在900 W时，改进后的6x STC效率提高了0.5%，功耗降低了16.77%。最高效率达98.71%。
Switched-tank converter (STC) concept can leverage the advantages of wide bandgap devices. And it is especially suitable for GaN/SiC devices. This paper presents an improved STC with separate resonant branches and on-time control method to achieve efficiency improvement. Since the STC relies on resonant operation to reach high efficiency, the problems caused by unmatched resonant tanks in different resonant loops need to be studied and solved. The study shows that in most severe case, problems caused by the unmatched resonant tanks not only compromise the efficiency of STC, but also cause undesired damage to the STC. As a result, old simple control method that uses only two complementary control signals (50% duty cycle) is not good enough anymore. Hence, an improved STC as well as adaptive on-time control method have been proposed to ensure soft-switching and high efficiency operation of the STC. A 1.2kW prototype with 6:1 conversion ratio has been built to verify the effectiveness of the proposed control method. The experimental results show that with the proposed control, efficiency of the improved 6x STC is increased by 0.5% at 900W, which means power loss is reduced by 16.77%. A peak efficiency of 98.71% has been achieved.