摘要
目前的负载点(POL)变换器大多是Buck、Boost等PWM直流变换器,它们的主回路中均含有电感,因此动态特性受到限制。本文在自驱动零电压开关(ZVS)非隔离全桥DC-DC变换器的基础上,推导出了一种反激式开关电容PWM直流变换器。该变换器是开关电容变换器和传统的调压直流变换器的结合,同时具备开关电容变换器动态特性快以及PWM变换器可调压的优点。此外,它还具有如下优点:①开关管实现了零电压开关;②采用外加变压器绕组的方法实现同步整流管的自驱动,减小了驱动损耗和体二极管导通损耗;③变压器漏感对效率的影响小,可以使用分立式变压器,节约成本且易于安装;④变换器是单相的,结构简单,应用灵活。本文详细给出了该变换器的推导过程、原理分析和自驱动方法。在理论分析的基础上,搭建了一台单相700kHz 1.2V/35A POL原理样机,从而表明了理论分析的正确性。
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.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第4期87-94,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51007038)
霍英东教育基金会基础性研究课题(131056)
台达电力电子科教发展基金(DREG2009010)
南京市留学回国人员科技活动项目择优资助理费资助项目
关键词
开关电容变换器
调压变换器
自驱动
零电压开关
Switching capacitor converter
PWM converter
self-driven
zero voltage switching
