Abstract：In this paper, a fast unloading transient response Buck converter using coupled-inductor auxiliary circuits based sequence switching control scheme is proposed, so as to improve the unloading transient response of the time-optimal control (TOC) scheme. The proposed auxiliary coupled inductor circuit is controlled to connect in parallel with the input voltage source, so as to increase the inductor-current slew rate during an unloading transient. Furthermore, an ‘n+1’ sequence switching strategy is proposed to control the auxiliary coupled inductor. With the proposed control strategy the load transient event is divided into n+1 sub-periods, and in each sub-period, the capacitor-charge balance principle is used to determine the switching time sequence. In addition, the system voltage overshoot is determined by the maximum voltage overshoot in each of n+1 periods, and the settling time is shortened to the moment that the inductor current reached the output current firstly. Moreover, a 12V/3.3V synchronous Buck converter has been built to verify the feasibility of the proposed scheme.
赵朝阳, 卢伟国, 胡志凌, 马俊文, 周雒维. 耦合电感序列切换的快速卸载瞬态响应Buck变换器[J]. 电工技术学报, 2020, 35(zk1): 28-36.
Zhao Zhaoyang, Lu Weiguo, Hu Zhiling, Ma Junwen, Zhou Luowei. Fast Unloading Transient Response Buck Converter Using Coupled Inductor Based on Sequence Switching Control. Transactions of China Electrotechnical Society, 2020, 35(zk1): 28-36.
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2020, Vol. 35 
