Parabolic-modulated sliding-mode voltage control of a buck converter

Sinan Li, Wenlong Qi, Siew Chong Tan, S.Y.Ron Hui

Research output: Contribution to journalArticlepeer-review

40 Citations (SciVal)


Conventional hysteresis-modulation-based sliding-mode (SM) controller exhibits a varying switching frequency. Existing SM controllers for achieving constant-switching-frequency operation often have complicated structures and/or are less straightforward to design to meet different steady state, transient, and loading requirements. In this paper, a new direct SM voltage controller based on parabolic modulation (PM) is proposed and applied to a buck converter. The objective is to achieve constant-switching-frequency operation of a switching converter with simple control structure and good operating performance. Both theoretical study and experimental work on a buck converter show that the proposed PM-based SM control can achieve 1) constant switching frequency in the continuous-conduction mode (CCM) and quasi-constant switching frequency in the discontinuous-conduction mode (DCM) of operation, 2) inherent input-disturbances rejection and superior reference tracking performance, and 3) seamless mode transition between CCM and DCM.
Original languageEnglish
Pages (from-to)844-854
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number1
Early online date19 Jun 2017
Publication statusPublished - 31 Jan 2018


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