LD在开关电源驱动下的结温与输出特性研究

半导体激光器（LD）的驱动电路要求能够提供充足的载流子,且工作状态要稳定.从半导体物理学理论出发,分析了半导体激光器在恒流和稳压2种状态下,结电压、结电流和结温三者的关系.并以此为理论基础,进行了半导体激光器在双路跟踪电源恒流模式和开关电源LT1912驱动下的实验.实验结果表明,开关稳压电源驱动半导体激光器正常工作的核心条件是能够提供充足的载流子,即开关电源要具备低电压高功率的输出特性.开关稳压电源驱动半导体激光器的优点在于电路设计简单,不用考虑过流保护和过压保护电路,且半导体激光器的工作状态也很稳定.

Characteristics of LD Driven by the Switching Power Supply

Semiconductor laser（LD） drive circuit required to provide enough current and working state is stable.According to semiconductor physics theory,the relationships of junction voltage,junction current and junction temperature is analyzed.Experiments on LD in dual tracking power supply constant current mode and driven by LT1912 switching power supply were made.Experimental results show that LD drive circuit of work conditions is to provide sufficient current——-the switching power supply drive LD must have the output characteristics of low voltage and high power.The advantages for switching power drive LD is simple in circuit design,and working conditions are very stable.With increasing chip performance,switching power supply will be widely used.