A High-Efficiency QR Flyback DC–DC Converter with Reduced Switch Voltage Stress Realized by Applying a Self-Driven Active Snubber (SDAS)

Jeong-Sang Yoo (), Jong-Ok Baek and Tae-Young Ahn
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Jeong-Sang Yoo: Department of Electronics Engineering, Cheongju University, Cheongju 28503, Republic of Korea
Jong-Ok Baek: R&D Division, Zinnos Inc., Busan 49108, Republic of Korea
Tae-Young Ahn: Department of Electrical & Control Engineering, Cheongju University, Cheongju 28503, Republic of Korea

Energies, 2023, vol. 16, issue 3, 1-21

Abstract: In this paper, a QR flyback converter using a self-driven active snubber (SDAS) was proposed to solve the problem of voltage surge in the switch of QR flyback converters. In the proposed converter, the SDAS consisting of a clamping capacitor and an active switch can be configured in parallel with the main switch or transformer to reduce the voltage surge in the switch. To confirm the steady-state characteristics of the QR flyback converter to which the proposed SDAS is applied, equivalent circuits for each state were constructed, and the equations and characteristics for each state were determined. A 60 W class small AC–DC adapter was constructed to confirm the effectiveness of the proposed converter and the control circuit method, and the experimental results were analyzed. The size of the experimental AC–DC adapter was 74 × 29 × 23 mm , and it had a high power density of 20 W / in 3 or more. The experimental circuit was limited to the high power conversion efficiency of up to 91.56%, and the maximum voltage surge in the switch was approximately 450 V. One of the reasons for such high efficiency is the SDAS circuit, which sufficiently reduces the voltage surge of the QR flyback switch, compared with the RCD clamp circuit, and does not consume power in principle.

Keywords: quasi-resonant flyback converter; synchronous rectifier; active clamping switch; RCD snubber; valley switching; active snubber; self-driven active snubber (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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