Abstract:Nowadays, the point-of-load (POL) converters are Buck, Boost and other PWM DC-DC converters. The inductor exists in their power loop and the dynamic performance is limited. Based on the ZVS self-driven non-isolated full-bridge converter, this paper proposes a novel flyback switching capacitor PWM DC-DC converter. The converter is the combination of a switching capacitor converter and a PWM converter, and it has both good transient performance and regulated output voltage. Besides, it has the following advantages: ①The switches realize zero voltage switching. ②An additional transformer winding self-driven method is applied to reduce the drive loss and the synchronous rectifier body diode conduction loss. ③Its efficiency is not sensitive to leakage inductor, so that the ordinary discrete transformer which is easy to install can be used to save the cost. ④Single phase option makes it more flexible. Its derivation, operation principle and self-driven method are presented. A single-phase 700kHz 1.2V/35A output POL prototype was built to verify the analysis.
[1] 徐德鸿. DC/DC模块电源发展动态[J]. 电子产品世界, 2004, (6): 36-38. [2] Voltage regulator module and enterprise voltage regulator-down 11.1 design guidelines[Z]. Intel, November 2009. [3] Zhou X, Zhang X, Liu J, et al. Investigation of candidate VRM topologies for future microprocessors[C]. Proceedings of IEEE Applied Power Electronics Conference, Anaheim, California, USA, 1998: 145-150. [4] 袁伟, 张军明, 钱照明. 一种混合式自适应电压定位控制策略及12V电压调节模块拓扑[J]. 电工技术学报, 2010, 25(10): 115-121. [5] Wei J, Lee F C.A novel soft-switched, high-frequency, high-efficiency, high-current 12V voltage regulator 3/4 the phase-shift buck converter[C]. Proceedings of IEEE Applied Power Electronics Conference, Miami Beach, Florida, USA, 2003: 724-730. [6] 陈为, 卢增艺, 王凯. 电压调节模块耦合电感性能分析与设计[J]. 电工技术学报, 2009, 24(1): 127- 132. [7] Yao K, Xu M, Meng Y, et al. Design considerations for VRM transient response based on the output impedance[J]. IEEE Transactions on Power Electronics, 2003, 18(6): 1270-1277. [8] Zhou J, Xu M, Sun J, et al. A self-driven soft-switching voltage regulator for future microprocessors[J]. IEEE Transactions on Power Electronics, 2005, 20(4): 806-814. [9] Ke Jin, Yi Sun, Ming Xu, et al. Integrated magnetic self-driven ZVS nonisolated full-bridge converter[J]. IEEE Transactions on Industrial Electronics, 2010, 57(5): 1615-1623. [10] Ke Jin, Ming Xu, Fred C Lee. A switching-capacitor PWM DC-DC converter and its variations[J]. IEEE Transactions on Power Electronics, 2010, 25(1): 24-32. [11] Ioinovici A. Switched-capacitor power electronics circuits[J]. IEEE Circuits Systems Magazine, 2001, 1(1): 37-42. [12] 丘东元, 张波, 郑春芳, 等. 谐振开关电容变换器新型PWM控制策略[J]. 中国电机工程学报, 2006, 26(2): 116-120. [13] Ke Jin, Ming Xu, Yi Sun, et al. Evaluation of self-driven schemes for 12V self-driven voltage regulator[J]. IEEE Transactions on Power Electronics, 2009, 24(10): 2314-2322.