A Novel Buck Converter with Constant Frequency Controlled Technique

Hsiao-Hsing Chou and Hsin-Liang Chen
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Hsiao-Hsing Chou: Department of Electrical Engineering, National Penghu University of Science and Technology, Penghu 880011, Taiwan
Hsin-Liang Chen: Department of Electrical Engineering, Chinese Culture University, Taipei 11114, Taiwan

Energies, 2021, vol. 14, issue 18, 1-19

Abstract: This paper presents a buck converter with a novel constant frequency controlled technique, which employs the proposed frequency detector and adaptive on-time control (AOT) logic to lock the switching frequency. The control scheme, design concept, and circuit realization are presented. In contrast to a complex phase lock loop (PLL), the proposed scheme is easy to implement. With this novel technique, a buck converter is designed to produce an output voltage of 1.0–2.5 V at the input voltage of 3.0–3.6 V and the maximum load current of 500 mA. The proposed scheme was verified using SIMPLIS and MathCAD. The simulation results show that the switching frequency variation is less than 1% at an output voltage of 1.0–2.5 V. Furthermore, the recovery time is less than 2 μs for a step-up and step-down load transient. The circuit will be fabricated using UMC 0.18 μm 1P6M CMOS processes. The control scheme, design concept and circuit realization are presented in this paper.

Keywords: adaptive on time (AOT); constant on time (COT); constant off time (CFT); voltage mode control (VMC); current mode control (CMC); peak current mode (PCM); valley current mode (VCM); average current mode (ACM); electromagnetic interference (EMI); phase lock loop (PLL) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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