新式切換頻率調變控制技術之同步整流降壓型轉換器的研製

蘇暉發

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新式切換頻率調變控制技術之同步整流降壓型轉換器的研製

Design and Implementation of Synchronous Rectified Buck Converter with Novel Switching Frequency Modulation Control Technique

蘇暉發 , Masters　　Advisor：歐勝源　　

繁體中文

切換頻率調變；相同步整流；多相插敘式控制；零電壓切換； Switching frequency modulation ； Synchronous rectification ； Multiphase interleaved control ； Zero-voltage-switching

Abstract │ Reference (28) │ Times Cited (4) │ Altmetrics

Abstract 〈TOP〉

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A novel switching frequency modulation control technique of switching frequency for synchronous rectified buck converter used in such as motherboards is proposed in this paper. The switching frequency is modulated higher as loads more lightly and vice versa, so that the proposed scheme is also called variable-frequency control method. Zero voltage switching (ZVS) can be achieved to boost efficiency without additional auxiliary switches and any storage elements while frequency is modulated. To avoid conduction loss increase excessively and cause the output ripple under control and in view of the switching frequency being finite, the switching frequency will be fixed constant when the much more loading is added wherein the load threshold to fix switching frequency constant is found by experiments. Compared to conventional constant switching frequency techniques with 250kHz, experimental results derived from an eight-phase synchronous rectified buck converter show the proposed modulation technique is superior to the conventional one, the efficiency can be increased up to 9% for eight-phase synchronous rectified buck converter under various load conditions.

Reference ( 28 ) 〈TOP〉

[1] R. T. Chen, “Single-stage autotransformer-based VRM with input current shaper,” IEEE Trans. Power Electron., vol. 22,pp.2375–2385, Nov. 2007.
連結：
[2] X. Zhou, P. Xu and F. C. Lee, “A novel current-sharing control technique for low-voltage high-current voltage regulator module applications,” IEEE Trans. Power Electron., vol. 15, pp.1153–1162, Nov 2000.
連結：
[3] C. Collins and M. Duffy, “Distributed (parallel) inductor design for VRM applications,” IEEE Trans. Power Electron., vol. 41, pp.4000–4002, Oct. 2005.
連結：
[4] J. Quintero, A. Lazaro, C. Fernandez, M. Sanz and A. Barrado, “Reduction of the switching frequency and the number of phases in multiphase VRM by applying linear — non — linear control,” in Proc. IEEE PESC’06 Conf., 2006, pp.1–6.
連結：
[5] A. Simon-Muela, S. Petibon, C. Alonso and J. L. Chaptal,“ Practical implementation of a high-frequency current-sense technique for VRM,” IEEE Trans. Ind. Electron., vol. 55, pp.3221–3230, Sept. 2008.
連結：

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