采用SA7527的LED驅(qū)動(dòng)電源方案,此類方案已大批量生產(chǎn),品質(zhì)穩(wěn)定.
優(yōu)點(diǎn):
1)高功率因數(shù):0.95以上
2)低諧波:15%以下
3)高效率
缺點(diǎn):
1)后級(jí)輸出紋波大,但對(duì)LED沒有影響,如客人有要求,后級(jí)可采用DC TO DC的方案.
2)成本比低功率因數(shù)的電源略高.
我公司內(nèi)置的變壓器與骨架已經(jīng)開出來,配套IC銷售!
具體規(guī)格見此貼:http://bbs.dianyuan.com/topic/416018
高功率因數(shù)的LED驅(qū)動(dòng)電源,含PCB
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功率因數(shù)與諧波測(cè)試:
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500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197596611.jpg');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197596638.jpg');}" onmousewheel="return imgzoom(this);"> 0
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24V/350MA 應(yīng)用:
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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 應(yīng)用
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597122.jpg');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597122.jpg');}" onmousewheel="return imgzoom(this);"> 1
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24V/1A 恒壓應(yīng)用:
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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 恒壓應(yīng)用:
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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 恒壓應(yīng)用:
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24V/1.5A 應(yīng)用
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597386.jpg');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597386.jpg');}" onmousewheel="return imgzoom(this);"> 0
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12LED 350mA 輸出
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597482.jpg');}" onmousewheel="return imgzoom(this);">
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20LED 350mA
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197597618.jpg');}" onmousewheel="return imgzoom(this);">
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1A 50V 輸出,采用三極管恒流,會(huì)有溫漂!
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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!我想找一個(gè)10V400mA的LED驅(qū)動(dòng)電路能給一個(gè)便宜的方案,我看你們?cè)O(shè)計(jì)的用3個(gè)431設(shè)計(jì)的恒流驅(qū)動(dòng)設(shè)計(jì)很新穎,不知道效果怎么樣?煩請(qǐng)告知小弟學(xué)習(xí)學(xué)習(xí)!
3led 350mA 跟你的參數(shù)基本相同,只需改一下恒流電流即可!
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500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/60/487871197854802.jpg');}" onmousewheel="return imgzoom(this);"> 0
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@szevwell
3led350mA跟你的參數(shù)基本相同,只需改一下恒流電流即可![圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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個(gè)431恒流肯定沒問題,只是對(duì)前面兩個(gè)431的精度一致性要求高,這樣做出來的產(chǎn)品,基本上沒有溫飄!TVS350可用上面電路的阻容替代.
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12V 2A 紅綠燈應(yīng)用方案,供參考!
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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);">
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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);"> 0
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@szevwell
12V2A紅綠燈應(yīng)用方案,供參考![圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/60/487871197857353.jpg');}"onmousewheel="returnimgzoom(this);">
非常感謝你!我先搭個(gè)電路試驗(yàn)一下!
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@szevwell
12V2A紅綠燈應(yīng)用方案,供參考![圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';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!看了你的電路很感興趣,不知有沒有可能一個(gè)電源分兩路恒流輸出呢?比如說我做個(gè)24V/7A的單輸出的恒流開關(guān)電源,如何實(shí)現(xiàn)分兩路3.5A恒流輸出呢?
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@szevwell
24V/350MA應(yīng)用:[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/60/487871197597049.jpg');}"onmousewheel="returnimgzoom(this);">
你這個(gè)工作在什么模式下,是不是在DCM呢?如果是我認(rèn)變壓變比可能再修改一下比較好
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