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山東LED顯示屏恒流驅動電路的設計分析

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山東LED顯示屏恒流驅動電路的設計分析

發布日期:2019-03-01 10:57 來源:http://qiye0755.com 點擊:

   LED顯示屏是80年代后期在全球迅速發展起來的新型信息顯示媒體,它利用發光二極管構成的點陣模塊或像素單元,組成大面積顯示屏幕,以其可靠性高、使用壽命、環境適應能力強、性能價格比高、使用成本低等特點, 在信息顯示領域已經得到了非常廣泛的應用。

澳门国际百家乐  LEDXIANSHIPINGZHUYAOBAOKUOFAGUANGERJIGUANGOUCHENGDEZHENLIE、QUDONGDIANLU、KONGZHIXITONGJICHUANSHUJIEKOUHEXIANGYINGDEYINGYONGRUANJIANDENG,QIZHONGQUDONGDIANLUSHEJIDEHAOHUAI, DUILED XIANSHIPINGDEXIANSHIXIAOGUO、ZHIZUOCHENGBENJIXITONGDEYUNXINGXINGNENGQIZHUHENZHONGYAODEZUOYONG。SUOYI,SHEJIYIZHONGJINENGMANZUKONGZHIQUDONGDEYAOQIU,TONGSHISHIYONGQIJIANSHAO、CHENGBENDIDEKONGZHIQUDONGDIANLUSHIHENYOUBIYAODE。BENWENJIUCHANGGUIXINGQUDONGDIANLUDESHEJIZUOXIEFENXIBINGTICHUHENGLIUQUDONGDIANLUDESHEJIFANGSHI。

1 、LED顯示屏常規驅動電路的設計

澳门国际百家乐 LED XIANSHIPINGQUDONGDIANLUDESHEJI,YUSUOYONGKONGZHIXITONGXIANGPEIHE,TONGCHANGFENWEIDONGTAISAOMIAOXINGQUDONGJIJINGTAISUOCUNXINGQUDONGERDALEI。YIXIAJIUDONGTAISAOMIAOXINGQUDONGDIANLUDESHEJIWEILIWEIJINXINGFENXI:

澳门国际百家乐 DONGTAISAOMIAOXINGQUDONGFANGSHISHIZHIXIANSHIPINGSHANGDE4XING、8XING、16XINGDENGn XINGFAGUANGERJIGUANGONGYONGYIZULIEQUDONGJICUNQI, TONGGUOXINGQUDONGGUANDEFENSHIGONGZUO,SHIDEMEIXINGLEDDEDIANLIANGSHIJIANZHANZONGSHIJIANDE1/n ,ZHIYAOMEIXINGDESHUAXINSULVDAYU50Hz,LIYONGRENYANDESHIJUEZANLIUXIAOYING,RENMENJIUKEYIKANDAOYIFUWANZHENGDEWENZIHUOHUAMIAN。

澳门国际百家乐  CHANGGUIXINGQUDONGDIANLUDESHEJIYIBANSHIYONGCHUANRUBINGCHUDETONGYONGJICHENGDIANLUXINPIANRU74HC595HUOMC14094 DENGZUOWEILIESHUJUSUOCUN,YI8050 DENGXIAOGONGLVNPNSANJIGUANWEILIEQUDONG,ERYIDALINDUNSANJIGUANTIP127 DENGZUOWEIXINGSAOMIAOGUAN,

RUYIDANSEDIANZHEN、16 XING×64 LIEWEIYIGEJIBENDANYUAN,ZEXUYONG8 PIAN74HC595、64GE8050JI16GEXINGSAOMIAOGUAN, QIGONGZUOYUANLIWEI:JIANGBAPIAN74HC595JILIAN,GONGYONGYIGECHUANXINGSHIZHONGCLKJISHUJUSUOCUNXINHAOSTR。DANGDIYIXINGXUYAOXIANSHIDESHUJUJINGGUO8×8= 64 GECLKSHIZHONGHOUJIANGQUANBUYIRU74HC595ZHONG,CISHICHANSHENGYIGESHUJUSUOCUNXINHAOSTR,SHISHUJUSUOCUNZAI74HC595DEHOUJISUOCUNQIZHONG,ZEYUQIGESHUCHUWEIDUIYINGDE8050 JIANGCHUYUBAOHEDAOTONGHUOJIEZHI; TONGSHIYOUXINGSAOMIAOKONGZHIDIANLUCHANSHENGXINHAOSHIDIYIXINGSAOMIAOGUANDAOTONG,XIANGDANGYUDIYIXINGLEDDEZHENGDUANDOUJIEGAOPING,XIANRANDIYIXINGLEDGUANZIDELIANGMIEJIUQUJUEYU74HC595ZHONGSUOSUOCUNDEXINHAO;ZAIDIYIXINGLEDGUANZIDIANLIANGDETONGSHI,ZAI74HC595ZHONGYIRUDIERXINGYAOXIANSHIDESHUJU,SUIHOUJIANGQISUOCUN,BINGTONGSHIYOUXINGSAOMIAOKONGZHIDIANLUJIANGDIYIXINGSAOMIAOGUANGUANBIERJIETONGDIERXING,SHIDIERXINGLEDGUANZIDIANLIANG。YICILEITUI,DANGDISHILIUXINGSAOMIAOGUOHOUZAIHUIDAODIYIXING,ZHIYAOSAOMIAOSUDUZUGOUGAO,JIUKEXINGCHENGYIFUWANZHENGDEWENZIHUOTUXIANG,

  2、CHANGGUIXINGQUDONGDIANLUCUNZAIDEQUEXIAN

  (1) DANGMOUYIXINGXINGQUDONGGUANYOUXIAOSHI,GAIXINGSUODUIYINGDESUOYOULEDFAGUANGERJIGUANDEDIANLIANGDIANLIUDOUJIANGLIUGUOGAIXINGQUDONGSAOMIAOGUAN,ERYIXINGZHONGDIANLIANGLEDGUANZIDEDUOSHAOSUISUOYAOXIANSHIDEWENZIHUOTUXINGERBUDUANGAIBIAN,SUOYIXINGSAOMIAOGUANZHONGLIUGUODEDIANLIUYOUJIAODADEBIANHUA,JIANGSHIQIGUANYAJIANGYOUSUOGAIBIAN;

  (2) DIANLIANGLEDGUANZIDEDUOSHAOERYINQIDIANLIUDEBIANHUAYEJIANGYINGXIANGDAODIANYUANDIANYAZHIDEBODONG,YOUCIJIANGYINGXIANGDAODIYIXINGLEDGUANZILIANGDUANDEDIANYA,SHIQISUIBUTONGDEXIANSHIWENZIHUOTUXINGBUDUANBODONG,YINGXIANGLEZHENGGEXIANSHIPINGLIANGDUDEJUNYUNXING。

澳门国际百家乐  3 、LEDXIANSHIPINGHENGLIUQUDONGDIANLUDESHEJI

  TU3 GEICHULEFAGUANGERJIGUANDEXIANGDUILIANGDUYUQIZHONGLIUGUODEDIANLIUZHIJIANDEGUANXI,CONGQUXIANZHONGKEYIKANCHU: ZAIYIDINGDEZHENGXIANGDIANLIUGONGZUOFANWEINEI,QIFAGUANGLIANGDUYUQIZHONGLIUGUODEDIANLIUJINSICHENGZHENGBI,SHUYUDIANLIUQUDONGXINGQIJIAN。SUOYIZHIYAONENGBAOZHENGMEIGELEDFAGUANGGUANZHONGLIUGUODEDIANLIUWEIYICHANGSHU,JIUNENGBAOZHENGQILIANGDUYIZHI。

  ERCONGCHANGGUIXINGQUDONGDIANLUDEGONGZUOYUANLIZHONGKEYIKANCHU,YOUYUQIXING、LIEQUDONGGUANDOUGONGZUOZAIBAOHEZHUANGTAI,WUFAKONGZHIQIDIANLIUDEDAXIAO,SUOYIWAIJIADIANYUANDIANYADEBODONG、XINGSAOMIAOQUDONGGUANGUANYAJIANGDEGAIBIANDENG,JIUZHIJIEYINGXIANGLED FAGUANGGUANZHONGLIUGUODEDIANLIU,YEJIGAIBIANLEQIXIANSHILIANGDU。RUGUOJIANGLIEQUDONGGUANYOUBAOHEZHUANGTAIGAIWEIXIANXINGFANGDAZHUANGTAI,BIANCHENGHENGLIUXINGQUDONG,JIUKEYIXIAOCHUYOUSHANGSHUYINSUZAOCHENGDEXIANSHIPINGLIANGDUBUJUNYUNDEXIANXIANG。

澳门国际百家乐  ZAIDIANYUANDIANYAVDD WENDINGSHI,74HC595 DEGAODIANPINGSHUCHUDIANYAV YEHENWENDING,RUDIANYUANDIANYAVDDWEI6V SHI,V = 5.9V。SUOYIDANG74HC595DEMOUYIWEISHUCHUWEIGAODIANPINGSHI, QIDUIYINGLIEDEL ED JIANGBEIDIANLIANG,QIEQIZHONGLIUGUODEDIANLIUJINSIWEI:

只要合理選擇R1、R2、R3 的值,就可保證LED 中流過的電流穩定不變,并且可以使LED發光二極管工作在正向電流與對應發光亮度的最佳狀態。

  YONGZHEZHONGLIEHENGLIUQUDONGFANGSHIGONGZUO,KEYIZUODAOBUGUANYIXINGZHONGLEDGUANZIDIANLIANGSHUDEDUOSHAO,QIXINGQUDONGGUANDEGUANYAJIANGSUIRANRENGYOUBIANHUA,DIANYUANDIANYAVCCYEKEYIYOUSUOGAIBIAN,YOUYUMEIGELEDFAGUANGERJIGUANZHONGLIUGUODEDIANLIUHENGDINGBUBIAN, CONGERBAOZHENGLELED XIANSHIPINGLIANGDUDEJUNYUNXING


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