半导体激光器驱动电路设计

发布时间：2018-01-13 00:03

本文关键词：半导体激光器驱动电路设计　出处：《天津工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：半导体激光器最突出的优点是体积小,重量轻,运转可靠,耗电少,效率高,在制造、通讯、清洗等领域得到了广泛的应用。半导体激光器的输出是否稳定取决于半导体激光器工作温度及注入电流的稳定性。因此,设计一款高稳定性及高效率的半导体激光器驱动电路是所必须的。本文介绍了半导体激光器工作原理以及特性,对于电流注入的大小非常敏感,同时温度的升高对于半导体激光器的性能也产生影响。根据这两点,设计出一款适合半导体激光器的驱动电路,能够稳定的输出恒压恒流以驱动半导体激光器,同时兼顾了半导体激光器的温度保护功能。本设计将激光器驱动电路分为三部分,分别是功率变换电路、驱动电流控制电路、激光器保护电路。功率变换电路即开关电源电路,将市电转化为激光器所使用的低压恒压输出。驱动电流控制部分基于负反馈原理,采用最常用的集成运放、功率MOSFET管组成的恒流源电路来完成。激光器温度保护电路同样基于闭环控制思想,设计了利用工业温度传感器采集温度,之后经过反馈参数,调节电路工作状态,从而维持激光器的正常工作温度。最后,对所研制的半导体激光器驱动电源系统进行性能测试。开关电源可以完成小电压大电流的输出,恒流源驱动可以平稳的输出设计的阶梯电流,并且电流输出平稳,保护电路能够按照设计的参数正常的启动保护半导体激光器。
[Abstract]:The most outstanding advantages of semiconductor lasers are small size, light weight, reliable operation, low power consumption, high efficiency, in manufacturing, communication. Cleaning and other fields have been widely used. The stability of semiconductor laser output depends on the operating temperature of semiconductor laser and the stability of injection current. It is necessary to design a high stability and high efficiency semiconductor laser drive circuit. This paper introduces the principle and characteristics of semiconductor laser, which is very sensitive to the size of current injection. At the same time, the rise of temperature also affects the performance of semiconductor lasers. According to these two points, a driving circuit suitable for semiconductor lasers is designed, which can output steady constant voltage and constant current to drive semiconductor lasers. At the same time, the temperature protection function of semiconductor laser is considered. In this design, the laser drive circuit is divided into three parts: power conversion circuit and drive current control circuit. Laser protection circuit. Power conversion circuit, that is, switching power supply circuit, convert the electric power to the low-voltage constant voltage output used in the laser. The driving current control part is based on the principle of negative feedback and adopts the most commonly used integrated operational amplifier. The laser temperature protection circuit is also based on the closed-loop control idea, and the industrial temperature sensor is used to collect the temperature, and then the feedback parameters are passed. Adjust the working state of the circuit, so as to maintain the normal operating temperature of the laser. Finally, the performance of the semiconductor laser drive power system is tested. The switching power supply can complete the output of small voltage and high current. The constant current source driver can output the designed step current smoothly, and the current output is stable. The protection circuit can start the semiconductor laser in accordance with the designed parameters.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248.4

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