利盈娱乐(中国)创新平台有限公司

LED驱动电(dian)(dian)路(lu)直接采用220V的交流(liu)市电(dian)(dian)作为电(dian)(dian)源。固然工作电(dian)(dian)流(liu)不大，但是(shi)工作电(dian)(dian)压较高，而且(qie)是(shi)未(wei)经隔离(li)的，所以假如(ru)有朋(peng)友(you)对此电(dian)(dian)路(lu)感(gan)兴味想(xiang)要(yao)自制的话一定要(yao)注意(yi)安全。

这种(zhong)LED驱(qu)动电路大(da)局部用于照(zhao)明灯(deng)具中(zhong)。普(pu)通都是灯(deng)具的(de)第一档(dang)，LED档(dang)位。或(huo)者是户外广告牌(pai)，亦或(huo)者是简(jian)易的(de)LED灯(deng)泡中(zhong)。

电(dian)(dian)路(lu)(lu)构造明(ming)晰明(ming)了。首先是(shi)一个桥(qiao)式整流(liu)(liu)把220V的(de)(de)(de)(de)交流(liu)(liu)整流(liu)(liu)成(cheng)一个频(pin)率100Hz的(de)(de)(de)(de)脉(mai)动直(zhi)流(liu)(liu)。后面的(de)(de)(de)(de)C1滤波电(dian)(dian)容(rong)器(qi)将脉(mai)动直(zhi)流(liu)(liu)滤波成(cheng)300V左右的(de)(de)(de)(de)比拟稳(wen)定(ding)的(de)(de)(de)(de)直(zhi)流(liu)(liu)。图中的(de)(de)(de)(de)1300是(shi)一种高(gao)耐压(ya)的(de)(de)(de)(de)NPN三极(ji)(ji)(ji)管(guan)。耐压(ya)值(zhi)至(zhi)少在400V以上。R1电(dian)(dian)阻则(ze)为三极(ji)(ji)(ji)管(guan)的(de)(de)(de)(de)驱动电(dian)(dian)阻。担任为三极(ji)(ji)(ji)管(guan)提供一个基极(ji)(ji)(ji)电(dian)(dian)流(liu)(liu)，保证三极(ji)(ji)(ji)管(guan)的(de)(de)(de)(de)导通。R2电(dian)(dian)阻器(qi)则(ze)是(shi)LED电(dian)(dian)路(lu)(lu)中的(de)(de)(de)(de)限(xian)流(liu)(liu)电(dian)(dian)阻，限(xian)制了最大工作电(dian)(dian)流(liu)(liu)，同(tong)时会有一定(ding)分压(ya)作用，保证电(dian)(dian)路(lu)(lu)的(de)(de)(de)(de)正常运(yun)转。

D1则是一个2V的(de)(de)稳(wen)(wen)压(ya)管(guan)(guan)，说(shuo)实话，这种2V的(de)(de)稳(wen)(wen)压(ya)管(guan)(guan)真的(de)(de)不(bu)多见。大局部常用(yong)的(de)(de)稳(wen)(wen)压(ya)管(guan)(guan)集中在5.6V-12V上(shang)。假如找不(bu)到(dao)适宜(yi)的(de)(de)2V稳(wen)(wen)压(ya)管(guan)(guan)，能够尝试用(yong)二极管(guan)(guan)串联(lian)得到(dao)近似值的(de)(de)模仿稳(wen)(wen)压(ya)管(guan)(guan)。比方单只二极管(guan)(guan)导通(tong)压(ya)降在0.5V，则四(si)只普通(tong)二极管(guan)(guan)就是2V的(de)(de)压(ya)降了。C2电(dian)容器在电(dian)路中起到(dao)一个去频闪的(de)(de)作用(yong)。避免不(bu)稳(wen)(wen)定(ding)的(de)(de)电(dian)压(ya)形成(cheng)的(de)(de)LED驱动电(dian)流的(de)(de)变化(hua)招致的(de)(de)LED忽明忽暗(an)或(huo)者(zhe)频闪状况的(de)(de)发(fa)生。

图中R2电阻(zu)应(ying)(ying)采(cai)用(yong)不小于(yu)(yu)2W的电阻(zu)器。1300的NPN三极管详(xiang)细型号应(ying)(ying)该(gai)是(shi)(shi)13003。其参数(shu)为耐(nai)压(ya)400V，最(zui)(zui)大电流(liu)1.5A，最(zui)(zui)大功率40W。此三极管常见于(yu)(yu)节能灯电路中。高耐(nai)压(ya)电容器也能在节能灯电路中发现。后级LED采(cai)用(yong)白光小草(cao)帽(mao)LED，图中给出(chu)的数(shu)量是(shi)(shi)88个，数(shu)量还是(shi)(shi)比(bi)拟可观的。亮度上应(ying)(ying)该(gai)能够让人称心。

再次声明，自制(zhi)一(yi)定要注意安全。

那么为何说巧(qiao)妙呢？巧(qiao)妙之处在于D1与(yu)(yu)R2加上后(hou)(hou)面的LED负载(zai)(zai)结合组成(cheng)了一个恒流(liu)源。能够(gou)看到(dao)，假如(ru)后(hou)(hou)级LED负载(zai)(zai)较轻，则三极管(guan)会(hui)(hui)(hui)在80K电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻的驱(qu)(qu)动(dong)(dong)下，全功率向后(hou)(hou)级负载(zai)(zai)供电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，输出(chu)最高电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)。假如(ru)后(hou)(hou)级的LED由(you)于发(fa)热(re)形成(cheng)工作电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)过大(da)，则会(hui)(hui)(hui)招致R2的输出(chu)端电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)变(bian)低，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)越(yue)大(da)，也就是后(hou)(hou)级负载(zai)(zai)越(yue)重，则此电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)会(hui)(hui)(hui)变(bian)得越(yue)低。当(dang)此处电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)与(yu)(yu)三极管(guan)基极处的电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)差高于2V时(shi)，D1稳压(ya)管(guan)会(hui)(hui)(hui)导(dao)通(tong)。那么当(dang)稳压(ya)管(guan)导(dao)通(tong)后(hou)(hou)会(hui)(hui)(hui)分流(liu)掉三极管(guan)的驱(qu)(qu)动(dong)(dong)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，此时(shi)，三极管(guan)的导(dao)通(tong)才能会(hui)(hui)(hui)降落，输出(chu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的才能也会(hui)(hui)(hui)降低，抵达LED的电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)也会(hui)(hui)(hui)降低。完成(cheng)了一个自(zi)动(dong)(dong)调整工作电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)、坚(jian)持(chi)工作电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的功用。

电(dian)路(lu)设计中，我(wo)们(men)希望(wang)大(da)家能够遵照一个用(yong)最少元(yuan)器件完成相同或者(zhe)更多功用(yong)的(de)(de)(de)准(zhun)绳。不只仅是节约本钱，关(guan)键的(de)(de)(de)是能最大(da)效率(lv)的(de)(de)(de)应用(yong)元(yuan)器件，降低整个电(dian)路(lu)的(de)(de)(de)毛病点，保证电(dian)路(lu)的(de)(de)(de)稳(wen)定性(xing)。

联系方式：邹(zou)先生（KIA MOS管）

手(shou)机(ji)：18123972950

QQ：2880195519

联系(xi)地址：深圳(zhen)市福田区车(che)公庙天安数码城(cheng)天吉大(da)厦CD座5C1

关注KIA半(ban)导体工(gong)程(cheng)专辑请搜微信号(hao):“KIA半(ban)导体”或点(dian)击本文下方图片扫(sao)一(yi)扫(sao)进(jin)入(ru)官(guan)方微信“关注”

长按二维码识别关注