An adaptive control system for a wide input range adaptive zero-voltage-switching buck converter

By selecting the optimal valley current and dead time in the ZVS-Buck converter through an adaptive control system, the problems of low efficiency and electromagnetic interference in the traditional ZVS-Buck converter over a wide input voltage range are solved, achieving efficient zero-voltage switching control and improving system stability and power density.

CN122137200APending Publication Date: 2026-06-02SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Filing Date
2026-02-02
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional ZVS-Buck converters suffer from high switching losses, low efficiency, and severe electromagnetic interference over a wide input voltage range. Existing control schemes cannot adapt to different input voltage conditions, resulting in uneven losses under high-voltage and low-voltage conditions.

Method used

An adaptive control system is adopted to achieve zero-voltage switching control under wide input conditions by adaptively selecting the optimal valley current and dead time, thereby balancing switching losses and conduction losses and reducing electromagnetic interference.

Benefits of technology

It improves the efficiency and stability of the converter over a wide input voltage range, reduces switching losses, reduces electromagnetic interference, and meets the application requirements of high power density and high frequency.

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Abstract

This invention discloses an adaptive control system for an adaptive zero-voltage switching Buck converter with a wide input range, belonging to the field of high-power-density power converters and power management technology. The system includes a control circuit and a switch drive circuit. The switch drive circuit includes high-side, low-side, and clamping switch drive circuits. The control circuit includes an inductor current sampling module, an output voltage sampling module, a compensation module, a comparator, two timers, three adaptive dead-time modules, an adaptive valley current control module, and three flip-flops. This invention accurately calculates the optimal valley current to achieve ZVS control under wide input conditions, balancing switching and conduction losses under wide input conditions, effectively improving the converter's switching frequency and conversion efficiency, while reducing electromagnetic interference. It provides a practical solution to meet the needs of VRMs in high-power-density, high-frequency, and wide-input-voltage application scenarios.
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