提升LED散热效率的诀窍 照明设备的功率,决议了需求思考散热疑问的严峻程度,功率LED是指作业电流在100mA以上的发光二极管,是中国行标参照美国ASSIST联盟界说的,按现有二种LED的正向电压典型值2.1V及3.3V,即输入功率在21MicrosoftInternetExplorer402DocumentNotSpecified7.8Web0
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提升LED散热效率的诀窍
照明设备的功率,决议了需求思考散热疑问的严峻程度,功率LED是指作业电流在100mA以上的发光二极管,是中国行标参照美国ASSIST联盟界说的,按现有二种LED的正向电压典型值2.1V及3.3V,即输入功率在210mw及330mw以上的LED均为功率LED,都需求思考器材热散疑问。
有些人可能有不一样观点,但实习证明,要进步功率LED的可靠性,就要思考功率LED的散热疑问。与LED散热有关的主要参数有热阻、结温和温升等。
热阻是指器材的有用温度与外部规则参考点温度之差,除以器材中的稳态功率耗散所得的商。它是表示器材散热程度的最重要参数。当前散热较好的功率LED热阻≤10℃/W,国内报道最佳的热阻≤5℃/W,国外可达热阻≤3℃/W,如做到这个水平可保证功率LED的寿数。
结温是指LED器材中主要发热有些的半导体结的温度。它是表现LED器材在作业条件下,能否接受的温度值。芯片及荧光粉的耐热性仍是很高的,当前已经到达芯片结温在150℃下,荧光粉在130℃下,根本对器材的寿数不会有什么影响。说明芯片荧光粉耐热性愈高,对散热的需求就愈低。
温升有几种不一样的温升,咱们这儿所评论的是:管壳-环境温升。它是指LED器材管壳(LED灯具可测到的最热点)温度与环境(在灯具发光平面上,距灯具0.5米处)温度之差。
它是一个可以直接测量到的温度值,并可直接表现LED器材外围散热程度,实习已证明,在环境温度为30℃时,如果测得LED管壳为60℃,其温升应为30℃,此刻根本上可保证LED器材的寿数值,如温升过高,LED光源的维持率将会大幅度降低。
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