Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 38, Issue 7, Pages 8379-8393Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3268613
Keywords
Constant Q-value; constant on-time (COT) control; ultrafast transient COT (UFTCOT) buck converter; wide-duty-cycle-range operation
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This article presents a frequency-domain analysis for modeling the behavior of Constant-on-Time (COT)-controlled buck converters in wide-input-output-range scenarios. A design strategy is proposed to enable robust control with a duty-cycle-independent quality factor, and a constant Q-value circuit is constructed to experimentally verify the system stability and optimal load transient response. The design strategy is also extended to other COT buck control schemes with simulation and calculation verifications.
This article presents a frequency-domain analysis that models the behavior of Constant-on-Time (COT)-controlled buck converters in wide-input-output-range scenarios. Based on this analysis, a design strategy is proposed to enable robust control with a duty-cycle-independent quality factor, also known as a constant Q-value. A constant Q-value circuit based on the proposed strategy is then constructed and incorporated with a baseline ultrafast transient COT control scheme to experimentally verify the system stability and optimal load transient response under wide input-output range scenarios. In addition, the design strategy is extended to otherCOTbuck control schemes with simulation and calculation verifications.
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