Enhanced Dynamic Regulation in Buck Converters: Integrating Input-Voltage Feedforward With Voltage-Mode Feedback

Autor: Mostafa Amer, Ahmed Abuelnasr, Mohamed Ali, Ahmad Hassan, Aref Trigui, Ahmed Ragab, Mohamad Sawan, Yvon Savaria
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: IEEE Access, Vol 12, Pp 7310-7328 (2024)
Druh dokumentu: article
ISSN: 2169-3536
DOI: 10.1109/ACCESS.2024.3351051
Popis: DC-DC buck converters in automotive and aerospace applications are often required to handle large disturbances in their input supply and abrupt variations in their loads. This paper proposes a systematic method to combine input-voltage feedforward (IVFF) and voltage-mode feedback (VFB) controllers, aiming to enhance the closed-loop performance of these DC-DC converters. This method relies on the stability boundary locus approach to help select the proper control parameters that achieve strong dynamic stability across the full operating range regardless of practical implementation challenges. Also, an optimization approach is employed to minimize the passive components’ area within the compensator, achieving a 79% reduction in integration size compared to conventional designs. The controller was fabricated in a 0.35- $\mu \text{m}$ CMOS technology, occupying a core area of 0.438 mm2. The prototype chip was experimentally tested to regulate a buck converter that leverages an e-GaN half-bridge while operating at 1 MHz. Measurement results show a remarkable closed-loop performance against line and load variations, reaching up to ±80 V/ms and ±535 mA per 150 $\mu \text{s}$ , respectively. The output remains stable, showcasing very small ( $ < 100\mu \text{s}$ ) with small overshoots (
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