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An Inductor Vertex Current Control Method for Four-Switch Buck–Boost Converter to Reduce the Sensitivity to Inductance Deviation
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DOI：10.1109/tpel.2026.3698418.png)
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Abstract
En 中文
The four-switch buck–boost (FSBB) converter features both voltage <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">step-up</i> and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">step-down</i> and positive output voltage. With the quadrilateral inductor current control scheme, all the power switches can realize zero-voltage-switching (ZVS) over the full input voltage and load range, and the ripple and RMS value of the inductor current are minimized, thus improving the efficiency. However, existing control methods rely on the inductance. When the actual inductance deviates from the theoretical one, the control accuracy is degraded, resulting in increased inductor current ripple or loss of ZVS. This article proposes an inductor vertex current control (VCC) method to reduce the sensitivity to the inductance deviation. The implementation of the proposed control method is presented. A 500 W prototype is fabricated and tested in the laboratory, and the experimental results are provided to verify the effectiveness of the proposed control method. It is shown that, under ± 20% inductance deviation, the proposed control method improves the maximum full-load efficiency from 96.6% to 97.6%.
Keywords:
Four-switch buck–boost (FSBB) converter
inductance deviation
pulsewidth modulation (PWM)
vertex current control (VCC)
zero voltage switching (ZVS)
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