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

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,...

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Bibliographic Details
Published in:IEEE access 2024, Vol.12, p.7310-7328
Main Authors: Amer, Mostafa, Abuelnasr, Ahmed, Ali, Mohamed, Hassan, Ahmad, Trigui, Aref, Ragab, Ahmed, Sawan, Mohamad, Savaria, Yvon
Format: Article
Language:English
Subjects:
Buck converter
Buck converters
Closed loops
Compensators
Control systems design
controller design
DC-DC converter
dynamic regulation
Dynamic stability
Electric potential
Feedback
feedforward
Feedforward control
GaN half-bridge
Load fluctuation
Passive components
Voltage
Voltage converters (DC to DC)
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Summary: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-[Formula Omitted] 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 [Formula Omitted], respectively. The output remains stable, showcasing very small (
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2024.3351051