Auxiliary Parallel Inductor Switching Control for Improving Load Transient Response Performance of Buck Converters

Weiguo Lu, Yixiao Ruan, Zhaoyang Zhao, Herbert H.C. Iu

Research output: Contribution to journalArticle

Abstract

This brief proposes an auxiliary parallel inductor switching control (ISC) scheme for buck converters to improve the transient response caused by load steps. During a transient period, an auxiliary inductor is connected with the buck converter in parallel to decrease the equivalent inductance, so as to increase the slew rate of the inductor current. In the steady state, the auxiliary inductor is switched out of the main circuit to ensure an expected ripple content in the steady state. Also, the switching moment of the auxiliary inductor during the transient period is derived based on the capacitor-charge balance principle. Finally, the proposed ISC scheme implemented by a digital processor and analog circuits is applied to a 30V-15V buck converter prototype. Experimental results show that the settling time and the voltage deviation are improved by 45% and at least 35.5% respectively for a load step 4.5A compared to the time-optimal control (TOC).

LanguageEnglish
Pages96-100
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume66
Issue number1
DOIs
Publication statusPublished - 2019

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Transient analysis
Analog circuits
Inductance
Capacitors
Networks (circuits)
Electric potential

Cite this

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title = "Auxiliary Parallel Inductor Switching Control for Improving Load Transient Response Performance of Buck Converters",
abstract = "This brief proposes an auxiliary parallel inductor switching control (ISC) scheme for buck converters to improve the transient response caused by load steps. During a transient period, an auxiliary inductor is connected with the buck converter in parallel to decrease the equivalent inductance, so as to increase the slew rate of the inductor current. In the steady state, the auxiliary inductor is switched out of the main circuit to ensure an expected ripple content in the steady state. Also, the switching moment of the auxiliary inductor during the transient period is derived based on the capacitor-charge balance principle. Finally, the proposed ISC scheme implemented by a digital processor and analog circuits is applied to a 30V-15V buck converter prototype. Experimental results show that the settling time and the voltage deviation are improved by 45{\%} and at least 35.5{\%} respectively for a load step 4.5A compared to the time-optimal control (TOC).",
keywords = "Auxiliary inductor, Buck converters, Inductance, Inductor switching control (ISC), Inductors, Steady-state, Switches, Time-optimal control (TOC)., Transient analysis, Transient response",
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year = "2019",
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Auxiliary Parallel Inductor Switching Control for Improving Load Transient Response Performance of Buck Converters. / Lu, Weiguo; Ruan, Yixiao; Zhao, Zhaoyang; Iu, Herbert H.C.

In: IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 66, No. 1, 2019, p. 96-100.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Auxiliary Parallel Inductor Switching Control for Improving Load Transient Response Performance of Buck Converters

AU - Lu, Weiguo

AU - Ruan, Yixiao

AU - Zhao, Zhaoyang

AU - Iu, Herbert H.C.

PY - 2019

Y1 - 2019

N2 - This brief proposes an auxiliary parallel inductor switching control (ISC) scheme for buck converters to improve the transient response caused by load steps. During a transient period, an auxiliary inductor is connected with the buck converter in parallel to decrease the equivalent inductance, so as to increase the slew rate of the inductor current. In the steady state, the auxiliary inductor is switched out of the main circuit to ensure an expected ripple content in the steady state. Also, the switching moment of the auxiliary inductor during the transient period is derived based on the capacitor-charge balance principle. Finally, the proposed ISC scheme implemented by a digital processor and analog circuits is applied to a 30V-15V buck converter prototype. Experimental results show that the settling time and the voltage deviation are improved by 45% and at least 35.5% respectively for a load step 4.5A compared to the time-optimal control (TOC).

AB - This brief proposes an auxiliary parallel inductor switching control (ISC) scheme for buck converters to improve the transient response caused by load steps. During a transient period, an auxiliary inductor is connected with the buck converter in parallel to decrease the equivalent inductance, so as to increase the slew rate of the inductor current. In the steady state, the auxiliary inductor is switched out of the main circuit to ensure an expected ripple content in the steady state. Also, the switching moment of the auxiliary inductor during the transient period is derived based on the capacitor-charge balance principle. Finally, the proposed ISC scheme implemented by a digital processor and analog circuits is applied to a 30V-15V buck converter prototype. Experimental results show that the settling time and the voltage deviation are improved by 45% and at least 35.5% respectively for a load step 4.5A compared to the time-optimal control (TOC).

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KW - Steady-state

KW - Switches

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