發(fā)布時間：2018-02-21 09:39

  本文關(guān)鍵詞： 半導體激光泵浦固體激光器 脈沖電流源 級聯(lián)疊加 線性調(diào)節(jié)　出處：《燕山大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著激光產(chǎn)業(yè)的發(fā)展,半導體激光泵浦固體激光器(Diodes Pumped Solid-State Laser,簡稱DPSSL)在各行各業(yè)中的應(yīng)用愈來愈廣泛,同時對作為激光器重要組成部分的激光電源也提出了更高的要求。由于半導體激光器是一種電流敏感器件,因此激光電源的核心技術(shù)是高質(zhì)量大功率脈沖電流源的實現(xiàn)。本文針對DPSSL驅(qū)動源技術(shù)展開研究,要求驅(qū)動電流波形是近似矩形波的脈沖串,每個脈沖頂部都要求具有一定的平穩(wěn)度,脈沖的上升沿和下降沿盡量在短時間內(nèi)完成。首先,通過介紹半導體激光器的工作原理,提出了對驅(qū)動電源的設(shè)計要求。針對本文脈沖激光電源輸出電壓高、脈沖電流大的特殊驅(qū)動要求,最終選擇多模塊級聯(lián)疊加形式的放電拓撲,并在此拓撲的基礎(chǔ)上研究了一種新穎的控制方案,即對功率開關(guān)管實行線性區(qū)調(diào)節(jié),在實現(xiàn)輸出驅(qū)動電流頂部平滑的同時,突破了當前驅(qū)動電源所受到的輸出電壓等級限制。其次,對方案中的脈沖電流源電路進行了工作原理的分析,并對該方案中級聯(lián)模塊的協(xié)調(diào)控制、電流閉環(huán)反饋調(diào)節(jié)器的設(shè)計及功率開關(guān)管類型選取等關(guān)鍵問題進行詳細討論。基于脈沖電流的動態(tài)、靜態(tài)調(diào)節(jié)要求,采用模擬電路搭建PID電流調(diào)節(jié)器。采用DSP數(shù)字控制產(chǎn)生具有線性上升沿的脈沖電流給定信號,與其輸出的PWM驅(qū)動信號協(xié)調(diào)控制多模塊的工作。此外,在DPSSL驅(qū)動電源的多模塊隔離供電方面,專門設(shè)計了一臺基于LCC諧振的高頻軟開關(guān)DC/DC變換器,作為多儲能電容的充電單元。該變換器具有抗負載開路和短路的特性,滿足脈沖放電負載對能量供給的要求。變換器的閉環(huán)環(huán)路由同一片DSP芯片實現(xiàn)數(shù)字控制,更易于實現(xiàn)輸出電壓的調(diào)節(jié)功能。最后,通過一個260V/40A的小功率實驗對所提出的級聯(lián)型驅(qū)動電流控制方案進行驗證,實驗結(jié)果證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.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM46;TN248

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本文編號：1521625