Abstract：With the rapid development of 5G communication, big data, artificial intelligence, and other emerging information technologies, data centers are becoming the critical infrastructure with rapid increases in application scale and power demand. The intermediate bus converter (IBC) is a critical power stage in the power supply architecture. Resonant switched capacitor converters (RSCCs) have the advantages of high efficiency, small size, lightweight, and potential for integration, which are suitable for IBC. This paper investigates an IBC based on the resonant switched capacitor to achieve high efficiency, low cost, and voltage regulation. Firstly, the conventional 2X step-down RSCC is investigated, and its working principle and voltage gain characteristics for zero-current turn-off operation are analyzed. However, it has shortcomings in the fixed voltage ratio and the susceptibility of the soft switching characteristics to resonant parameters. The simulation shows the resonant frequency drifts due to the tolerance of components, and the switches have hard turning-off problems, thus reducing the efficiency of the converter. The influence of component variation on the converter is analyzed by deducing the time-domain expression of the resonant current. Therefore, a multi-resonant switched capacitor converter (MRSCC) with high immunity toward component variation is introduced. The converter realizes the lossless reverse of the residual current in the resonant inductor within the dead time using the band-stop characteristic of the notch resonant frequency. The Class II ceramic capacitor can be used as the resonant component, which reduces the production cost. In order to meet different voltage conversion requirements of IBC, the multi-resonant switched tank converter (MRSTC) has been developed, and the basis and procedure for parameter design are proposed. Regarding the poor voltage regulation capability of convention RSCCs, an IBC based on quasi-parallel is investigated by combining MRSTC with a four-switch Buck-Boost (FSBB) converter. The working principle and voltage gain characteristics of the converter are analyzed. A three-mode rough regulation control strategy is proposed to increase the direct power ratio in FSBB. The small signal model and the transfer functions are deduced. The parameters of the closed-loop control system are designed to enhance the voltage regulation ability, thereby achieving output voltage stability. The results show that the proposed MRSCC is highly immune to component variation. The designed IBC prototype realizes the closed-loop regulation of output voltage while maintaining high efficiency in the range of input voltage and power.
戴瑞然, 马运东, 王鹏, 王鹏飞. 一种基于多谐振开关槽与Buck-Boost电路的准并联变换器[J]. 电工技术学报, 2024, 39(18): 5768-5785.
Dai Ruiran, Ma Yundong, Wang Peng, Wang Pengfei. A Quasi Parallel Converter Based on Multi Resonant Switched Tank and Buck-Boost Circuit. Transactions of China Electrotechnical Society, 2024, 39(18): 5768-5785.
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