摘要
采用变压器的励磁电感、谐振电容、附加电感构成半桥LLC谐振变换电路,实现输出平特性的软开关焊接电源.通过对串联谐振电感L r,串联谐振电容C r,以及与变压器并联的谐振电感L m,进行相关的分析和设计,使得变换器在整个负载工作范围内,原边功率开关管实现零电压开通,副边整流二极管实现零电流关断,变换电路降低损耗和干扰,提高了效率,其工作频率可以大大提高,使得电感、电容和变压器等器件的体积重量进一步下降,系统的动态性能也得以提高.论文讨论了其工作原理并制作2.5 kW半桥LLC焊接电源,同时给出相应的试验结果.
By using the magnetizing inductance of transformer,resonant capacitor and additional inductance,a halfbridge LLC resonant welding power supply with constant output voltage was implemented.Through careful analysis and design of relevant parameters(such as the series resonant inductor Lr,series resonant capacitor Cr,and the resonant inductor Lm paralleled with transformer etc) in the resonant tank,the ZVS turn-on can be achieved for primary side power switch,and the ZCS turn-off can be achieved for secondary rectifier diodes over the entire operation region.Hence,the loss and the interference can be decreased,the efficiency can be increased,the switching frequency can be higher so that the weight and the volume of the inductance,the capacitance and the transformer,and so on,can be decreased dramatically,and the dynamic behavior can be improved.The operation principle was also discussed briefly,a 2.5kW half-bridge LLC welding power supply was constructed and the experimental results were presented.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第12期13-16,1,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50567001)
南宁市科技攻关与新产品试制资助项目(201102096G)
关键词
半桥LLC变换器
谐振
零电压开通
零电流关断
half-bridge LLC converter
resonant
Zero-voltage turn-on
Zero-current turn-off
