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如何计算所需的LED冷却器的热电阻值

来源:发表时间:2018-11-07

上海11选5    ZAIBENWENZHONG,WOMENSHANGHAIZIDONGHUAYIBIAOSANCHANGJIANGZHANSHIRUHEJISUANLEDLENGQUEQISUOXUDEREDIANZU。


    ZUOWEIYIGELIZI,WOMENCAIYONGLED COBMOXING,QIBIAOCHENGZHENGXIANGDIANLIUIfWEI450mA,ZUIDAZHENGXIANGDIANLIUWEI900mA。


    WOMENJIANGYI500mADEZHENGXIANGDIANLIUQUDONGMOKUAI,ZHENGXIANGDIANYAVfWEI35.5V。

    ZUIGAOWAIQIAOWENDUTcWEI105℃,DANZAIWOMENDESHEJIZHONG,WOMENDEMUBIAOSHI75°CDESHIYONGSHOUMING。

上海11选5    WOMENYINGYONGDEHUANJINGWENDUWEI35°C。


上海11选5    LEDDENGJUKESHIWEIDIANQIFANGAN,LEDNEIBUDEREDIANZU,JIEKOUCAILIAOHELEDLENGQUEQISHICHUANLIANDE。



    DIANGONGLVPe = Vf×IfHUO35.5V×0.5A = 17.75W。

    HAOSANGONGLVPd = Pe xXIAOLV,QIZHONGCOBDEXIAOLVWEIYUE32%HUO17.75W×0.68 = 12.07W。

    ZHEISHIXUYAOLENGQUEDENENGLIANG。


    dTSHIWOMENXIANGYAOHUODEDEQIAOTIWENDUTcYUHUANJINGWENDUTaZHIJIANDEWENDUCHA。

    dT = Tc = TaHUO75℃-35℃= 40℃


    LEDLENGQUEQISUOXUDEZUIDAREDIANZURth +REJIEMIANCAILIAORth = dT / Pd = 40°C / 12.07W = 3.31°C / W

上海11选5    NINSHIYONGDESANREJIEKOUHUIDUIXINGNENGCHANSHENGZHONGDAYINGXIANG。

    WOMENSHANGHAIZIDONGHUAYIBIAOSANCHANGJIANYISHIYONGBEIJIYIN,LIANGHAODEDAOREYOUZHIHUO0.1ZHI0.15mmDEBOXIANGBIANHUOSHIMODAOREDIAN。

    ZAIZHEIZHONGQINGKUANGXIA,JIEMIANCAILIAODEREDIANZUZAI0.1HE0.2℃ZHIJIAN。

    ZHEIZHONGJIEKOUDIANZUKEYICONGJISUANCHUDEJIEKOUDIANZUZHONGJIANQU,YIQUEDINGSANREQISUOXUDESANREXINGNENG。

上海11选5    YINCIRthSANREQI= 3.31°C / W - 0.2°C / W = 3.11°C / WZUIDAZHI。


    ZAIZIYOUKONGQITIAOJIANXIA,RENHEBIREDIANZU(JIAODIZHI)3.11°C / WGENGHAODELEDLENGQUEQIDOUHUISHIWOMENDELEDWAIQIAOWENDUTcBAOCHIDIYUSUOXUDE75°C。

上海11选5    QINGJIZHU,LEDLENGQUEQIZHOUWEIDEWAIQIAO,QINGXIEHEQITABIANHUAHUIYINGXIANGLEDSANREQIDEXINGNENG - RUGUOXUYAOBANGZHU,QINGYUWOMENLIANXI。

    SHIYANSHICELIANGSUOXUDELEDLENGQUEQI


上海11选5    SHANGHAIYIBIAOSANCHANGDUISHIJIELINGXIANDELEDZHIZAOSHANGLED COBHEMOKUAIYIJIGEZHONGLEDLENGQUEQIHETIDAIQUDONGDIANLIUDEZUHEJINXINGLECHAOGUO1000XIAOSHIDESHIYANSHICELIANG。


    ZHEIXIESHIYANSHICESHIZAIZIYOUKONGQIDUILIUHUANJINGXIAWANCHENG,CHUIZHIDINGWEI,DIBUYOULED。DUIYUCESHI,WOMENSHIYONGXIANGBIANREJIEMIANLaird TPCM 585。


上海11选5    WEILEJINXINGRECELIANG,WOMENSHIYONGLIANGHAODESHUZIYIBIAO(2TONGDAOHUOGENGDUOTONGDAO)HEXIXIANREDIANOU,KEYIQINGSONGCELIANGYUNXINGZHONGDETcDIAN。CHULETcDIANSHANGDEREDIANOUWAI,HAIYAOZAILEDMOKUAIFUJINDELEDLENGQUEQIDIZUOSHANGANZHUANGREDIANOU。DANGWOMENKANDAOLIANGDIANZHIJIANDEWENCHACHAOGUO5°CSHI,WOMENJIANGYANZHENGTASHIYOUJIEMIANCAILIAOHAISHIRUNSHIBIAOMIAN(LEDMOKUAIHELEDLENGQUEQIZHIJIANDEJIECHU)YINQIDE。


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