A Positive Output Buck-Boost Converter with Extensive Linear Conversion Ratio Adjustment Range
Received: 5 October 2024 | Revised: 18 October 2024 | Accepted: 20 November 2024 | Online: 8 January 2025
Corresponding author: Truong Viet Anh
Abstract
The article introduces a non-isolated positive output buck-boost converter that is capable of operating across a wide duty cycle range. The converter exhibits low nonlinearity in its voltage gain relative to D, thereby enhancing its capability to regulate output voltage or effectively regulate current over a broad duty cycle spectrum. A comparison of the performance of the proposed converter with existing converters is presented, with a particular consideration of the DC gain, voltage and current stresses on switches and diodes, and inductor currents. The comprehensive calculations include ideal and practical voltage gains, current assessments, stress analysis on components, parameter design, efficiency, and brief discussions on the discontinuous conduction mode and boundary conditions. The converter exhibits peak efficiencies of approximately 98.98% in boost mode and 99.16% in buck mode, which represent a notable advancement in power electronics. It is noteworthy that the converter displays minimal current and voltage overshoot in buck mode with a conversion ratio below 3. The overshoot relative to the normalized current is less than 1, reaching a minimum of 0.21, while the voltage overshoot is as low as 0.51. This contributes to superior buck mode efficiency. A laboratory model was developed with great care to validate the converter's experimental outcomes and theoretical evaluations. This provides reassurance about the reliability of the research.
Keywords:
buck-boost, non-isolated, positive output, dc-dc converter, voltage gainDownloads
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Copyright (c) 2024 Nguyen Van Ban, Pham Vo Hong Nghi, Quach Thanh Hai, Truong Viet Anh
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