采用SA7527的LED驱动电源方案,此类方案已大批量生产,品质稳定.
优点:
1)高功率因数:0.95以上
2)低谐波:15%以下
3)高效率
缺点:
1)后级输出纹波大,但对LED没有影响,如客人有要求,后级可采用DC TO DC的方案.
2)成本比低功率因数的电源略高.
我公司内置的变压器与骨架已经开出来,配套IC销售!
具体规格见此贴:http://bbs.dianyuan.com/topic/416018
高功率因数的LED驱动电源,含PCB
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功率因数与谐波测试:
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24V/350MA 应用:
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597049.jpg');}" onmousewheel="return imgzoom(this);">
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24V/750MA 应用
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24V/1A 恒压应用:
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597237.jpg');}" onmousewheel="return imgzoom(this);">
24V/2A 恒压应用:
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597289.jpg');}" onmousewheel="return imgzoom(this);">
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24V/2A 恒压应用:
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597289.jpg');}" onmousewheel="return imgzoom(this);">
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24V/1.5A 应用
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12LED 350mA 输出
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20LED 350mA
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1A 50V 输出,采用三极管恒流,会有温漂!
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597709.jpg');}" onmousewheel="return imgzoom(this);">
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@lxq8453
你好!我想找一个10V400mA的LED驱动电路能给一个便宜的方案,我看你们设计的用3个431设计的恒流驱动设计很新颖,不知道效果怎么样?烦请告知小弟学习学习!
3led 350mA 跟你的参数基本相同,只需改一下恒流电流即可!
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@szevwell
3led350mA跟你的参数基本相同,只需改一下恒流电流即可![图片]500){this.resized=true;this.width=500;this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/60/487871197854802.jpg');}"onmousewheel="returnimgzoom(this);">
用3个431恒流肯定没问题,只是对前面两个431的精度一致性要求高,这样做出来的产品,基本上没有温飘!TVS350可用上面电路的阻容替代.
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12V 2A 红绿灯应用方案,供参考!
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197857353.jpg');}" onmousewheel="return imgzoom(this);">
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@szevwell
12V2A红绿灯应用方案,供参考![图片]500){this.resized=true;this.width=500;this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/60/487871197857353.jpg');}"onmousewheel="returnimgzoom(this);">
非常感谢你!我先搭个电路试验一下!
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@szevwell
12V2A红绿灯应用方案,供参考![图片]500){this.resized=true;this.width=500;this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/60/487871197857353.jpg');}"onmousewheel="returnimgzoom(this);">
szevwell 兄:你好!看了你的电路很感兴趣,不知有没有可能一个电源分两路恒流输出呢?比如说我做个24V/7A的单输出的恒流开关电源,如何实现分两路3.5A恒流输出呢?
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@szevwell
24V/350MA应用:[图片]500){this.resized=true;this.width=500;this.alt='这是一张缩略图,点击可放大。\n按住CTRL,滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/60/487871197597049.jpg');}"onmousewheel="returnimgzoom(this);">
你这个工作在什么模式下,是不是在DCM呢?如果是我认变压变比可能再修改一下比较好
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