宽输出范围的半导体激光泵浦固体激光器驱动电源的研究

发布时间：2018-02-21 09:39

本文关键词： 半导体激光泵浦固体激光器脉冲电流源级联叠加线性调节　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着激光产业的发展,半导体激光泵浦固体激光器(Diodes Pumped Solid-State Laser,简称DPSSL)在各行各业中的应用愈来愈广泛,同时对作为激光器重要组成部分的激光电源也提出了更高的要求。由于半导体激光器是一种电流敏感器件,因此激光电源的核心技术是高质量大功率脉冲电流源的实现。本文针对DPSSL驱动源技术展开研究,要求驱动电流波形是近似矩形波的脉冲串,每个脉冲顶部都要求具有一定的平稳度,脉冲的上升沿和下降沿尽量在短时间内完成。首先,通过介绍半导体激光器的工作原理,提出了对驱动电源的设计要求。针对本文脉冲激光电源输出电压高、脉冲电流大的特殊驱动要求,最终选择多模块级联叠加形式的放电拓扑,并在此拓扑的基础上研究了一种新颖的控制方案,即对功率开关管实行线性区调节,在实现输出驱动电流顶部平滑的同时,突破了当前驱动电源所受到的输出电压等级限制。其次,对方案中的脉冲电流源电路进行了工作原理的分析,并对该方案中级联模块的协调控制、电流闭环反馈调节器的设计及功率开关管类型选取等关键问题进行详细讨论。基于脉冲电流的动态、静态调节要求,采用模拟电路搭建PID电流调节器。采用DSP数字控制产生具有线性上升沿的脉冲电流给定信号,与其输出的PWM驱动信号协调控制多模块的工作。此外,在DPSSL驱动电源的多模块隔离供电方面,专门设计了一台基于LCC谐振的高频软开关DC/DC变换器,作为多储能电容的充电单元。该变换器具有抗负载开路和短路的特性,满足脉冲放电负载对能量供给的要求。变换器的闭环环路由同一片DSP芯片实现数字控制,更易于实现输出电压的调节功能。最后,通过一个260V/40A的小功率实验对所提出的级联型驱动电流控制方案进行验证,实验结果证明了此方案的可行性。
[Abstract]:With the development of laser industry, Diodes Pumped Solid-State Laser (DPSSLL) is more and more widely used in various industries. At the same time, the laser power supply, which is an important part of the laser, is also required. Because the semiconductor laser is a kind of current-sensitive device, Therefore, the core technology of laser power supply is the realization of high quality and high power pulse current source. The top of each pulse must have a certain degree of smoothness, and the rising and descending edges of the pulse should be completed in as short a time as possible. First, by introducing the working principle of the semiconductor laser, The design requirements of the driving power supply are put forward. In view of the special driving requirements of the pulse laser power supply with high output voltage and large pulse current, the discharge topology of the cascade superposition of the multi-module is chosen finally. On the basis of this topology, a novel control scheme is studied, that is, the linear regulation of the power switching tube is carried out, and the top of the output drive current is smooth at the same time. It breaks through the limit of the output voltage level of the current driving power supply. Secondly, the working principle of the pulse current source circuit in the scheme is analyzed, and the coordinated control of the cascade module in the scheme is given. The design of current closed-loop feedback regulator and the selection of power switch type are discussed in detail. The PID current regulator is constructed by using analog circuit. The pulse current given signal with linear rise edge is generated by DSP digital control, and the multi-module is coordinated with the output PWM drive signal. A high frequency soft-switching DC/DC converter based on LCC resonance is designed as a charging unit of multi-energy storage capacitors in the multi-module isolated power supply of DPSSL drive power supply. The converter has the characteristics of anti-load open circuit and short circuit. The closed loop of the converter is digitally controlled by the same DSP chip, which makes it easier to adjust the output voltage. The proposed cascade drive current control scheme is verified by a 260V / 40A low-power experiment. The experimental results show that the proposed scheme is feasible.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM46;TN248

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