| 摘要: |
| 采用变压器的励磁电感,隔直电容,变压器的漏电感和绕制的附加电感构成全桥LLC变换电路,实现一种平特性的软开关全桥焊接电源.结果表明,在整个负载工作范围内,电路工作在两个谐振频率之间,功率开关实现零电压开通,整流二极管的实现零电流关断;整个电路可以工作在更高的开关频率,功率密度高,损耗小,效率高,特别适合在大功率场合.文中讨论了其工作原理,制作3.2 kW焊接电源,并给出试验结果. |
| 关键词: 焊接电源 LLC全桥变换器 谐振 零电压开通 零电流关断 |
| DOI： |
| 分类号: |
| 基金项目: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项目(201102096G) |
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| A full-bridge LLC soft-switching welding power supply |
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CHEN Yanming1, WANG Huixiong1, WANG Zhenmin2, XUE Jiangxiang2, LI Guojin1
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1.College of Electrical Engineering, Guangxi University, Nanning 530004, China;2.College of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China
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| Abstract: |
| By utilizing the transformer magnetizing inductor, DC block capacitor,leakage inductance and the auxiliary inductor, a full-bridge LLC soft-switching welding power supply with constant output voltage was proposed. Because the converter was operated between the two resonant frequency in the whole load range,the zero voltage switching(ZVS) turn-on can be achieved for primary side power switch,and the zero current switching(ZCS) turn-off can be achieved for secondary rectifier diodes. The converter can be operated in higher frequency,with high density,lower losses and high efficiency,hence it is especially suitable for the high power applications. Moreover,the operation principles were discussed as well. Finally,a 3.2 kW welding power supply prototype had been implemented,and the experimental results were also presented. |
| Key words: welding power supply LLC full-bridge converter resonant ZVS turn-on ZCS turn-off |
