摘要
针对传统模拟电源在轻载时损耗较大、效率较低的缺陷,提出一种基于DSP控制的高效率数字电源设计方案,即Burst模式控制策略,可有效改变轻载模式下的开关频率,使LLC半桥谐振变换器实现软开关并减少开断损耗。实验结果表明,该种变换器在小于5%额定负载时效率能达到87%以上,在5%~20%额定负载时能够保持93%及以上的效率,证明提出的Burst控制策略能够提高轻载效率。
To solve the disadvantages of traditional anlog power supply loss and less efficient, the scheme of digital power based on the DSP is proposed. A new Burst- mode control strategy is proposed, which can change the switch frequency at light load condi-tion. ZVS can be achieved, meanwhile, the LLC half bridge converter switching and transmission loss is reduced, and the light load efficiency is improved. The resuls show that under 5 % load condition, the efficiency reaches 87 %, and in 5 % ~ 20 % load condition,the efficiency is higher than 93 %. The Burst- mode control scheme can improve efficiency.
出处
《电子技术应用》
北大核心
2015年第8期113-116,共4页
Application of Electronic Technique
基金
国家自然科学基金青年项目(51102159)
陕西科技大学博士专项基金项目(BJ08-07)
