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| AC-LED结温与开启电压关系测量 |
| Junction temperature measurement in AC-LED using cut-in voltage |
| 投稿时间：2013-09-24 |
| DOI：10.3969/j.issn.1005-5630.2014.01.001 |
| 中文关键词: AC-LED 结温 测量方法 开启电压法 |
| 英文关键词:AC-LED junction temperature measurement methods cut-in voltage method |
| 基金项目:国家自然科学基金资助项目（610728007） |
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| 中文摘要: |
| 根据交流发光二极管（AC-LED）的工作特征，提出了一种简单而精准的AC-LED结温测量方法：开启电压法。通过理论分析和实验发现，AC-LED的开启电压会随着结温的上升而下降，且两者之间有良好的线性关系，从而确认将开启电压作为温度变化参数来间接测量AC-LED的结温。实验表明，开启电压法测量结温的重复性最大误差为2.0 ℃，热阻重复性最大误差为0.6 ℃/W。经过对比分析，开启电压法得到热阻值比参考脉冲法更接近真实值。 |
| 英文摘要: |
| At present, the measurement methods of LED junction temperature are mainly aiming at direct current LED(DC-LED), and less methods have been proposed for alter current LED(AC-LED). With regard to this fact, a novel cut-in voltage method was proposed for measuring AC-LED junction temperature. From theoretical analysis and experimental verification, cut-in voltage of AC-LED was found to decrease along with the increase of junction temperature, demonstrating a good linear relationship between the two factors. Therefore, cut-in voltage was confirmed as the temperature variation coefficient(TVC). Further analysis suggested that the repeatability error of junction temperature and thermal resistance could be narrowed down to 2.0 ℃ and 0.6 ℃/W respectively. By comparison, thermal resistance acquired from cut-in voltage method was closer to real value than that of the reference pulse method. |
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