航天用高效率半导体激光器驱动电源

High-Efficiency Laser Diode Driver for Aerospace Applications

随着航天用半导体激光器功率的增加,对其驱动电源的效率提出了更高的需求,采用传统硬开关变换方式的反激已经无法满足效率要求。针对此问题,基于高可靠性器件和反激拓扑,研究一种高效率的恒流源实现方法。反激主电路采用准谐振的工作模式,谷底开通方式使其开关损耗大幅下降。利用一个电流互感器配合简单外围电路实现电流过零检测、输出电流平均值检测以及同步整流驱动三个功能,进一步降低了辅助电路的损耗。搭建了实验样机进行效率测试。结果表明:采用此设计方案的样机在额定负载下效率可以达到92%以上。

With the increase in the laser diode power for aerospace applications,higher demands are put forward on the efficiency of drive power supplies,and the flyback of traditional hard-switching mode has been unable to meet the efficiency requirements. In terms of this problem,based on high reliability devices and flyback topologies,a method for high-efficiency constant current source is studied. The quasi-resonant mode is used in the main flyback circuit,and the switching loss is greatly reduced by valley-switching. A current transformer combined with a simple peripheral circuit is used to achieve three functions,i.e.,current zero-crossing detection,average output current detection,and synchronous rectification drive,which further reduces the loss of the auxiliary circuit. An experimental prototype is built for efficiency testing. The results show that the efficiency of the prototype with this design scheme can reach over 92% under the rated load.