TY - JOUR
T1 - Auxiliary Parallel Inductor Based Sequence Switching Control to Improve Load Transient Response of Buck Converters
AU - Lu, Weiguo
AU - Chen, Weiming
AU - Ruan, Yixiao
AU - Iu, Herbert
PY - 2019/4
Y1 - 2019/4
N2 - In this paper, a sequence switching control (SSC) scheme based on auxiliary parallel inductor is proposed to improve the transient performance of buck converters. The proposed SSC scheme introduces a small controlled inductor in parallel with the output inductor, so as to increase the inductor-current slew rate when it is activated during a load transient. Furthermore, an "n+1" sequence switching strategy is proposed to control the auxiliary parallel inductor. The proposed scheme divides the transient event into n+1 periods. In the former n periods the same small output voltage deviations are designed, while in the last period a smaller deviation is done for a smooth transition from the transient to the steady state. The switching sequence is derived applying the capacitor-charge balance principle for each of n+1 periods. For a given buck converter in experiment, the settling time and the output voltage deviation of the proposed SSC scheme enhance more than 50% and 67% respectively over those of the time-optimal control (TOC) for a 3A load step.
AB - In this paper, a sequence switching control (SSC) scheme based on auxiliary parallel inductor is proposed to improve the transient performance of buck converters. The proposed SSC scheme introduces a small controlled inductor in parallel with the output inductor, so as to increase the inductor-current slew rate when it is activated during a load transient. Furthermore, an "n+1" sequence switching strategy is proposed to control the auxiliary parallel inductor. The proposed scheme divides the transient event into n+1 periods. In the former n periods the same small output voltage deviations are designed, while in the last period a smaller deviation is done for a smooth transition from the transient to the steady state. The switching sequence is derived applying the capacitor-charge balance principle for each of n+1 periods. For a given buck converter in experiment, the settling time and the output voltage deviation of the proposed SSC scheme enhance more than 50% and 67% respectively over those of the time-optimal control (TOC) for a 3A load step.
KW - auxiliary parallel inductor
KW - Buck converter
KW - sequence switching control (SSC)
KW - time-optimal control (TOC)
KW - transient response
UR - http://www.scopus.com/inward/record.url?scp=85048581894&partnerID=8YFLogxK
U2 - 10.1109/TIE.2018.2844847
DO - 10.1109/TIE.2018.2844847
M3 - Article
AN - SCOPUS:85048581894
SN - 0278-0046
VL - 66
SP - 2776
EP - 2784
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 4
M1 - 8384283
ER -