LM317作为输出电压可变的集成三端稳压块

LM317作为输出电压可变的集成三端稳压块 课 程 微电子实验 院 系 电子工程系 专 业 电子科学与技术 班 级 10电科2 学 号 20102321915 姓 名 孙国青 任课教师 郭业才 meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. To cultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation of projects 实验一 集成电路可调直流稳压电源设计 一?实验目的和要求 目的:(1)掌握可调集成直流稳压电源的工作原理。 (2)掌握可调集成直流稳压电源的组装与调试方法。 (3)学习提高实践技能，提高分析和解决实际问 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 的能力。 要求:(1)理解可调集成直流稳压电源的工作原理。 (2)输入交流电压，输出直流电压。且电压变化范围:1.25~37V连续可调。 (3)完成可调集成直流稳压电源电路性能的测试。 二?实验原理及原理图 2.1稳压电路的组成及原理图 电路的输出电流为0.5A，输出电压为1.25—1.5V连续可调。该电路主要由电源变压器、整流器、滤波器、稳压器以及电压指示等电路组成。LM317稳压器主要起稳定输出电压的作用，即在输入电压和负载电流变化时，保持输出电压基本不变。 2.2 稳压电路工作原理: (1)电路的工作过程。交流220V市电电压经电源变压器T1变压后，从其次级输出18V左右的交流低压，该电压经过由VD1—VD4构成的桥式整流电路整流，得到直流电压，经过C1电容器滤波，得到的约24V直流电压直接加至LM317稳压块的输入端2脚。 从LM317的2脚输入直流电压，经其内的电压调整电路，误差放大电路、基准电压电路将电压稳定后从3脚输出，去后级电路。 (2)消振电路。LM317的2脚与地之间连接的C2为消振电容器，用于消除由于LM317管脚引线过长而引起的自激振荡。 (3)电源可调电路。LM317的1脚外接的RP1可变电位器，R1、VD6、C3构成了电源可调电路，用于调节输出电压的大小，它是通过控制LM317的1脚上电位来进行输出电压大小调节。 meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. To cultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation of projects 正常工作时，在取样电阻R1的两端会有一个1.25V的基准电压，当该基准电压不变时，就有一个恒定的50—100uA的电流通过RP1，故调节RP1就可得到不同的输出电压。 为了保证输出电压恒定不变，在LM317的1脚与地之间，还连接有滤波旁路电容器C3。VD6二极管则是C3电容器的放电通路元器件，用于防止冲击电流损坏LM317，主要起保护作用。 (4)电压冲击保护。LM317稳压块的输入与输出端连接的二极管VD5用于防止输入端电压突然降低或输出端电压突然升高，输出电容器C4放电时对LM317的冲击，起保护稳压集成电路的作用。 三?集成电路可调直流稳压电源电路元器件选择 3.1 实验所用元器件 集成电路可调直流稳压电源电路的全部元器件如下 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 所示。电源变压器T1也可以自制，可选用舌宽19mm，叠厚28mm的硅钢片，初级用直径为0.19mm漆包绕2200圈，次级用直径为0.67mm的漆包线绕180圈。初级与次级之间要加屏蔽层。也可用黑白电视机上使用的220V/16~18V电源变压器。 元件清单 代号 名称 型号 规格 数说明 量 开关 普通电源开根据实际需要可选其他SA1 - 1 关 各种电源开关 电源变压器 可根据需要选用现成的T1 - 220v/16~18 1 电源变压器，也可自制 二极管 耐压大于50v 其他符合要求的硅二极VD2~V1N4001~ 6 管也可代用 D6 1N4004 电解电容器 CD10、 2200~3300μF/25v之间C1 2200~3300 1 μF/25v 电解电容均可使用 CD11 金属化纸介电CJ11、 0.22μF/160v 0.1~0.33μF之间均可使C2 1 容器 用 CJ10 三端稳压块 1.25~37v可可代替型号有WLM317、 IC1 LMLM311 调 FLM317、 SWLM317 7 微调电位器 1.8kΩ WH137等型号也可采用 RP1 WH7-B1 1 WH124 电阻器 RJ、RT、 120kΩ 阻值误差允许?20% R1 1 RTX 电解电容器 CD10、 10μF/25v 10~33μF之间均可使用 C3 1 CD11 电解电容 CD10、 100μF/25v 100~330μF之间均可使C4 1 用 CD11 meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. To cultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation of projects 3.2 LM317集成块简介 LM317作为输出电压可变的集成三端稳压块，是一种使用方便、应用广泛的集成稳压块。稳压电源的输出电压可用下式计算: Vo=1.25(1+R2/R1) 从公式本身看，R1、R2的电阻值可以随意设定。然而作为稳压电源的输出电压计算公式，R1和R2的阻值是不能随意设定的。首先LM317稳压块的输出电压变化范围是Vo=1.25V—37V其输出电压变化范围是(Vo=1.25V—45V)，所以R2/R1的比值范围只能是0~28.6。最小稳定工作电流的值一般为1.5mA。当LM317稳压块的输出电流小于其最小稳定工作电流时，LM317稳压块就不能正常工作。当LM317稳压块的输出电流大于其最小稳定工作电流时，LM317稳压块就可以输出稳定的直流电压。如果没有注意LM317稳压块的最小稳定工作电流，那么稳压电源可能会出现不正常现象:稳压电源输出的有载电压和空载电压差别较大。 3.2.1几种封装的引脚识别图: 3.2.2引脚识别 LM317稳压块最小稳定工作电流设定，可以通过设定R1和R2阻值的大小，而使LM317稳压块空载时输出的电流大于或等于其最小稳定工作电流，从而保证LM317稳压块在空载时能够稳定地工作。此时，只要保证Vo/(R1+R2)?1.5mA，就可以保证LM317稳压块在空载时能够稳定地工作。上式中的1.5mA为LM317稳压块的最小稳定工作电流。当然，只要能保证LM317稳压块在空载时能够稳定地工作，Vo/(R1+R2)的值也可以设定为大于1.5mA的任意值。 计算可知R1的最大取值为R1?0.83KΩ。又因为R2/R1的最大值为28.6。所以R2的最大取值为R2?23.74KΩ。在使用LM317稳压块的输出电压计算公式计算其输出电压时，必须保证R1?0.83KΩ，R2?23.74KΩ两个不等式同时成立，才能保证LM317稳压块在空载时能够稳定地工作。 LM317稳压集成块开路正常阻值 红笔所接触的引? ? ? ? ? ? 脚 黑笔所接触的引? ? ? ? ? ? 脚 测量的电阻值28~35 480~550 3.5~4.5 6.8~7.2 100~150 20~25 (,) meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. To cultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation of projects 四(实验电路的焊接与制作 4.1 焊接准备工作 焊接前一定要熟悉电路图和器件引脚对应，分析电路图注意元件布局。 4.2焊接步骤与检查 分析完电路，进行布局后，把元器件进行一一焊接。焊接过程中特别注意稳压二极管的方向和稳压块的引脚连接。焊接过程中我们留出四条引线，分别为接地线、电源线、从VD3、VD1引出两条引线。焊接完成之后要对电路进行检查，检查是否有虚焊，漏焊，短路。在此电路中LM317集成块的引脚可能会焊错，所以对于引脚要进行认真的判断。 四、调试与分析 5.1 调试结果 将留出的4根线分别接到相对应的万用表表头和变压器上，调节电位器，观察万用表示数的变化范围，并记下数值与规定范围做比较: 输出电压最小值(V) 输出电压最大值(V) 理想情况下 1.25 37 实际显示示数 1.12 21.3 5.2 调试结果分析 因电路调试以及测试时存在一定的误差，及每个元器件的精准度不同，所以会出现实际测量结果与理想结果不同的现象。 五、 心得 信息技术培训心得 下载关于七一讲话心得体会关于国企改革心得体会关于使用希沃白板的心得体会国培计划培训心得体会 与体会 本次的实验课程设计，是基于软件Protel 99Se设计原理图实现的。经过实验的完成和我们学习软件跟硬件的结合设计电路，提高了我们学习能力。掌握了常用元件的识别和测试;以及电路的焊接的水平也得到了提高。掌握了可调直流稳压电源原理及构造。在实验的前期，我们遇到了一些小问题，电路的设计跟电路焊接不能很好地完成。之后经过一些改进。我们应该知道成功地制板的严格工序，它的每一步都必须严格地按要求实际操作问题也解决了。这是要求我们能够有发现问题解决问题的能力。;它也让我懂得了仔细检查的重要性，也增强了我的细心度;6、从中我深深地体会到动手能力对于我们专业的重要性，也验证了实践才是检验真 meters village between road hardening, 11 km of pass group Highway, livelihood project; ordered advance XX finished pupils canteen, and wangji alone finished small teaching floor, and wangji alone finished pupils canteen, and ancient Dang "culture tourism features village", and wangji alone village and Bula village River suspension, and Bula village la Los end of pass group Highway, and XX Meters village debris flow disaster control, building project; started has victims will LOS, wood child moving, and autumn baby, pass group highway construction project; solid do "a water two dirt" regulation, and wood added Jia village, XING side fumin, and XX meters village pass village Highway hardening, and ancient Dang village disaster Hou traffic reconstruction, and Bula village whole village advance, and day care center, major project of early work. Second, develop eco-agriculture construction of the Canyon. Economic development of eco-agricultural construction in an important position, accelerated "8321" works completed caoguo 23700 acres planted, bubble 4125 acres planted walnuts, sumac 4000 acres planted, Yun Huang Lian 6040 acres planted, tea-oil tree planting 8887.8 acres. To cultivate new economic growth points, good farmers ' well-off society of the industrial base. Third, start a poverty alleviation project. Storming the headquarters was established, well-organized, well arranged, formation of 7 supporting task force launched the poverty file state cards work in a timely manner, the task force entered the village door communication policy, mobilization mass base, making poverty eradication plan, and find out about poverty, assist in the implementation of projects