全固态紫外激光器泵浦源驱动电路及高精度温控研制

发布时间：2018-01-18 05:11

  本文关键词：全固态紫外激光器泵浦源驱动电路及高精度温控研制　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 激光二极管 恒流驱动 温度控制 温控算法 半导体制冷器

【摘要】：紫外激光波长短、聚焦性能好及可实现“冷加工”的特性,使之广泛应用于医疗、高分辨光谱学、空间光通信、微加工等领域。近年来,激光二极管(Laser Diode,LD)泵浦的全固态紫外激光器(紫外DPSSL)因具有效率高、体积小、重复频率高、性能稳定等特点已成为紫外激光器的主要发展方向。但是LD对工作环境要求比较高,LD的工作温度与工作电流相互影响,电流和温度的波动会改变LD的输出波长和功率,进而影响全固态紫外激光器的输出特性。因此,研制电流连续可调、长时间稳定度高的恒流驱动电路和高精度温控系统是实现紫外DPSSL工业化的关键一环。本文设计的LD电源,主要内容有LD的驱动电路和高精度温控两部分。电源系统选用DSP F28335作为控制核心,由按键与液晶显示面板组成的用户界面完成对电源的控制。恒流驱动电路通过将高精度电流检测电阻PBV-R010反馈的电压值和设定电压值分别输入模拟比例-积分电路,经过电路运算处理输出控制电压,调节大功率调整管IRF150N的通断程度来稳定电流。此外,恒流驱动电路设有硬件、软件双重过流保护及延时软启动功能,避免损坏激光二极管。高精度温控系统选用由恒流模块驱动的半导体制冷器进行制冷,制冷效率由分段积分的比例-积分-微分控制算法输出控制量改变恒流模块的电流值来调节。在5~26℃环境下对该电路系统进行6h连续工作测试,实现对双路50W大功率激光二极管的恒流驱动及恒温控制。驱动电流调节范围1~8.8A,在驱动电路长时间工作于7.5A时,测得电流波动≤0.01A,稳定度达0.13%;温控范围为20~45℃,温控精度达到±0.02℃。测试结果说明,本文设计的LD电源提供的恒流源和温度控制调节范围广,控制精度高,能够长时稳定工作,对紫外DPSSL工程化发展具有一定应用价值。
[Abstract]:Due to its short wavelength, good focusing performance and the ability to realize "cold working", UV laser has been widely used in medical treatment, high resolution spectroscopy, space optical communication, micro-processing and other fields in recent years. The all-solid-state ultraviolet laser (DPSSL) pumped by laser diode laser diode (LDD) has high efficiency, small volume and high repetition rate. The stability of performance has become the main development direction of ultraviolet lasers, but the LD has a high working environment requirements, the operating temperature and current influence each other. The fluctuation of current and temperature will change the output wavelength and power of LD, and then affect the output characteristics of all-solid-state UV laser. The constant current drive circuit with high stability for a long time and the high precision temperature control system are the key link to realize the industrialization of UV DPSSL. The LD power supply is designed in this paper. The main contents are LD driving circuit and high precision temperature control. DSP F28335 is selected as the control core of the power supply system. The user interface composed of keystrokes and LCD panel controls the power supply. The constant current drive circuit inputs the voltage value and the set voltage value of the high precision current detection resistor PBV-R010 respectively into the simulation. Proportional-integral circuit. The output control voltage is processed by circuit operation, and the on-off degree of IRF150N is adjusted to stabilize the current. In addition, the constant current driving circuit is equipped with hardware. Software dual over current protection and delay soft start function to avoid damage to laser diode. The high precision temperature control system uses semiconductor cooler driven by constant current module to refrigerate. The refrigeration efficiency is adjusted by changing the current value of the constant-current module by the output of the proportional integral-differential control algorithm of the piecewise integral. The circuit system is tested for 6 hours at 5 ~ 26 鈩，

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