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直流可调稳压电源设计方法是什么？

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直流可调稳压电源设计方法是什么？

浏览：48次 | 提问时间： 07-29 05:47

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3个答案

愿隐山水间 07-29 05:48

1．直流稳压电源设计思路（1）电网供电电压交流220V(有效值)50Hz,要获得低压直流输出,首先必须采用电源变压器将电网电压降低获得所需要交流电压.（2）降压后的交流电压,通过整流电路变成单向直流电,但其幅度变化大（即脉动大）.（3）脉动大的直流电压须经过滤波电路变成平滑,脉动小的直流电,即将交流成份滤掉,保留其直流成份.（4）滤波后的直流电压,再通过稳压电路稳压,便可得到基本不受外界影响的稳定直流电压输出,供给负载RL.2．直流稳压电源原理直流稳压电源是一种将220V工频交流电转换成稳压输出的直流电压的装置,它需要变压、整流、滤波、稳压四个环节才能完成,图1直流稳压电源方框图其中：（1）电源变压器：是降压变压器,它将电网220V交流电压变换成符合需要的交流电压,并送给整流电路,变压器的变比由变压器的副边电压确定.（2）整流电路：利用单向导电元件,把50Hz的正弦交流电变换成脉动的直流电（3）滤波电路：可以将整流电路输出电压中的交流成分大部分加以滤除,从而得到比较平滑的直流电压.（4）稳压电路：稳压电路的功能是使输出的直流电压稳定,不随交流电网电压和负载的变化而变化.整流电路常采用二极管单相全波整流电路,电路如图2所示.在u2的正半周内,二极管D1、D2导通,D3、D4截止；u2的负半周内,D3、D4导通,D1、D2截止.正负半周内部都有电流流过的负载电阻RL,且方向是一致的.电路的输出波形

迷路和麋鹿 07-29 05:56

220V必须先用变压器降到20~24V交流后整流，LM317可不能承受直接220V整流输入，那样没含义，会触电身亡的，而且会直接击穿烧毁，降压整流后滤波，再用LM317调压，但是想3V1.2A工作没门，剩下21V1.2A产生的热量LM317散不了那么多热，LM317接最大的散热片可扛5瓦热量，你只有采用多绕组先降低输入电压，比如6V，9V，15V，20V，24V等换挡到接近电压后再用LM317稳压调节。不想换挡就得加扩流管，网上搜吧，一大堆。但白白耗那么多电也没啥含义的。

守一座城等一个旧人 07-29 06:04

一.jjw(单相)jsw（三相）精密净化交流稳压电源（无触点*式）1、概述jjw(单相)jsw（三相）精密净化交流稳压电源采用国际上先进的正弦能量分配程式的电源调节技术，并结合高效宽带滤波网络综合设计而成。代表了交流稳压技术的最新发展水平，其主电路由正弦能量分配器和大功率滤波器并联组成，当市电输入电压变化或负载电流变化时，正弦能量分配器以半个周期的正弦波电流形式，将能量按需要精确地输入到电感器，调整电感器的电感量，确保输出电压高精度稳定。本系列电源具有稳压范围宽、精度高、响应速度快、能长期连续工作等优点，并能有效地抑制电网中各种噪声和尖峰干扰，是目前净化交流稳压电源产品中最受用户欢迎的优选机种之一。该产品被广泛地应用于计算机及其周边装置、*疗*仪器、通讯广播设备、工业*设备、自动生产线等现代高科技产品的稳压和保护。2、主要技术指标与规格1)、工作频率：50hz±5%2)、稳压精度：±1%3)、瞬间恢复时间：20ms--100ms4)、效率：≥93（满载）5)、耐压：2000v1分钟无击穿6)、附加失真：≤3%7)、缺相保护：具备8)、绝缘电阻：≥2mω9)、过压保护：单相250v±5v，三相435v±10v10)、尖峰吸收：输入1000v/3us脉冲输出≤30v11)、环境温度:-5℃--40℃，环境湿度:20%--85%相数型号规格额定容量(kva)外型尺寸宽×高×深(mm)输入电压(v)输出电压(v)单相jjw-0.5kva0.5150×275×320176～266220±1%jjw-1kva1jjw-2kva2165×15×350jjw-3kva3190×330×400jjw-5kva5210×400×500jjw-10kva10245×530×475jjw-15kva15440×840×560jjw-20kva20440×840×560jjw-30kva30500×1050×365jjw-50kva50500×1050×620jjw-60kva60600×1250×680jjw-80kva80800×1250×720三相jsw-3kva3340×650×580304～456380±1%jsw-6kva6jsw-10kva10jsw-15kva15340×770×580jsw-20kva20jsw-30kva30jsw-50kva50570×1250×680jsw-75kva75600×1500×730jsw-100kva100jsw-150kva150

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