针对传统Buck变换器受最小占空比限制的影响,无法适用于高降压比场合的问题,提出了一种新型无变压器高降压DC-DC变换器。首先,详细地分析了所提变换器的工作模态和开关时序。其次,在控制层面,该变换器应用交错式脉宽调制的开关模式,不...针对传统Buck变换器受最小占空比限制的影响,无法适用于高降压比场合的问题,提出了一种新型无变压器高降压DC-DC变换器。首先,详细地分析了所提变换器的工作模态和开关时序。其次,在控制层面,该变换器应用交错式脉宽调制的开关模式,不但增加了其带载能力,还极大减少了元器件的电压应力。对新型高降压比变换器的工作过程进行分析,同时在理论上进行了参数设计。最后,搭建500/26 V 430 W的样机进行实验,实验结果充分证明了理论的正确性和可行性。展开更多
A novel high step-down non-isolated DC-DC converter has been proposed. The proposed converter consists of highly efficient non-isolated cell converters using bidirectional semiconductor power devices, and these cell c...A novel high step-down non-isolated DC-DC converter has been proposed. The proposed converter consists of highly efficient non-isolated cell converters using bidirectional semiconductor power devices, and these cell converters are connected in ISOP （input series and output parallel）. The non-isolated ISOP converter achieves high step-down ratio of D/N, operating N cell converters under the duty ratio olD. Availability of the proposed converter has been shown by developing the 48 V-12 V laboratory prototype using two 24 V-12 V cell converters. Design consideration for the 48 V-3 V multicellular converter using four 12 V-3 V cell converters has been also conducted, and the potential to approach the efficiency of 97% has been discussed. The proposed topology is suitable for the POL （point of load） converters in the highly efficient next generation DC distribution system for data centers.展开更多
文摘针对传统Buck变换器受最小占空比限制的影响,无法适用于高降压比场合的问题,提出了一种新型无变压器高降压DC-DC变换器。首先,详细地分析了所提变换器的工作模态和开关时序。其次,在控制层面,该变换器应用交错式脉宽调制的开关模式,不但增加了其带载能力,还极大减少了元器件的电压应力。对新型高降压比变换器的工作过程进行分析,同时在理论上进行了参数设计。最后,搭建500/26 V 430 W的样机进行实验,实验结果充分证明了理论的正确性和可行性。
文摘A novel high step-down non-isolated DC-DC converter has been proposed. The proposed converter consists of highly efficient non-isolated cell converters using bidirectional semiconductor power devices, and these cell converters are connected in ISOP （input series and output parallel）. The non-isolated ISOP converter achieves high step-down ratio of D/N, operating N cell converters under the duty ratio olD. Availability of the proposed converter has been shown by developing the 48 V-12 V laboratory prototype using two 24 V-12 V cell converters. Design consideration for the 48 V-3 V multicellular converter using four 12 V-3 V cell converters has been also conducted, and the potential to approach the efficiency of 97% has been discussed. The proposed topology is suitable for the POL （point of load） converters in the highly efficient next generation DC distribution system for data centers.
