摘要
为了减小电动汽车充电机谐波对电网造成的危害,很多充电机采用了三相输入功率因数校正(PFC)技术,造成充电机直流/直流(DC/DC)变换器的直流侧电压偏高。针对上述问题,提出了2种变压器钳位DC/DC变换器,并对基于串联谐振方式的变压器钳位3电平DC/DC变换器作了详细的分析。该变换器利用变压器钳位,无需辅助元器件,每个主开关电压应力是输入电压的一半,输入分压电容上的电压自动均压,大大降低了输入分压电容的容量要求。文中对变压器的钳位原理进行了分析,并通过一个6 kW的原理样机进行了实验验证。
In order to reduce the harm of harmonics produced by electric vehicle charger on power grid,three-phase power factor correction（PFC） technology is used for many chargers.This technology may cause voltage in DC link of DC/DC convertor too high.In order to solve these problems,two commonly transformer clamping DC/DC convertors are proposed.In the meantime,the operating principle of transformer clamping three-level resonant DC/DC convertor is described.With transformer clamp,auxiliary components for the convertor are not needed,and voltage stress for each main switch is half of input voltage.The voltages on input capacitors are equally sharing,and requirement of input capacitors is greatly reduced.Finally,the transformer clamping principle is analyzed,and it is proved by test of a 6 kW prototype of transformer clamping DC/DC convertor.
出处
《电力系统自动化》
EI
CSCD
北大核心
2010年第24期78-82,共5页
Automation of Electric Power Systems
