摘要
为了提高大功率开关电源的功率因数和可靠性,提出了一种基于磁组合式变压器的AC-DC变换器。该结构的变换器是将三个耦合变压器磁心中产生的磁通叠加输出,而非电的形式输出。根据三相电路瞬时功率平衡原理,利用三相互差120°的交流电的特性,使该变换器的直流环节的滤波电容采用了薄膜电容,而非电解电容,使电网侧的输入电流正弦化,实现自然PFC功能,从而提高了功率因数和功率密度。仿真和一台1k W的原理实验样机验证了理论分析的正确性及变换器的可行性。
To improve power factor and reliability of AC power supply, an AC-DC power converter based on magnetic-combination transformer is proposed in this paper. Instead of input AC sources in electric form, the proposed converter combines input AC source in magnetic form by adding up the produced magnetic flux from three magnetic cores of the coupled transformers. According to the instantaneous power balancing principle of three-phase circuit and the mutual difference of 120° for three-phase AC source, this topology adopts film capacitor and makes input current sinusoidal. This converter can achieve spontaneous PFC and improve power factor and power density. The simulation and experimental prototype of 1k W verify the theoretical analysis and the feasibility of the converter.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第8期19-26,共8页
Transactions of China Electrotechnical Society
基金
江苏省普通高校研究生科研创新计划项目(CXLX13_153)
中央高校基本科研业务费专项资金项目资助
关键词
磁通叠加
磁组合式变压器
薄膜电容
自然PFC
Magnetic flux additivity
magnetic-combination transformer
film capacitor
spontaneous PFC
