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Direct junction temperature measurement in high-power LEDs

机译：大功率LED中的直接结温测量

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The light quality and long-term stability of phosphor converted light-emitting diodes (LEDs) for luminaires depend on the temperature distribution inside the LED chip and the color conversion element. Therefore, a reliable and accurate method to establish the LED's junction temperature is required to further improve and optimize high quality LED luminaires. In this paper we describe the development and application of an innovative junction temperature measurement method which is based on a precise and universally applicable calibration procedure, allowing to use the calibrated LED itself as a temperature sensor under the respective operation condition of interest. This method is based on an extremely fast pulse measurement procedure allowing to record pairs of forward current and voltage drop values periodically every microsecond starting from the first microsecond of a pulse. From these experiments we reap two kinds of result: (1) Independent of the pulse shape in our experiments we observe a constant relation of current-to-voltage drop which we interpret as a constant junction conductivity. Depending on the type of LED (but independent of the packaging technology) we obtain a constant junction conductivity throughout several ten microseconds which we understand as a proof that the junction temperature did not change during this very first pulse phase. (2) The junction conductivity obtained in this moment is a measure for the junction temperature so that a calibration can be made by comparison with an independent steady-state temperature measurement made at zero-current condition. The method has been successfully applied to thermally characterize high-power LED modules as a 3 × 3 LED arrays with color conversion glob tops built-up on an insulated metal substrate (IMS).
机译：用于照明设备的磷光体转换发光二极管（LED）的光质量和长期稳定性取决于LED芯片和颜色转换元件内部的温度分布。因此，需要一种可靠，准确的方法来建立LED的结温，以进一步改善和优化高质量的LED照明器。在本文中，我们描述了一种创新的结温测量方法的开发和应用，该方法基于精确且普遍适用的校准程序，允许在感兴趣的各个工作条件下将已校准的LED本身用作温度传感器。该方法基于极其快速的脉冲测量程序，允许从脉冲的第一微秒开始每隔一微秒定期记录一对正向电流和电压降值。从这些实验中，我们获得两种结果：（1）在实验中，与脉冲形状无关，我们观察到电流-电压降的恒定关系，我们将其解释为恒定的结电导率。根据LED的类型（但与封装技术无关），我们可以在整个十微秒内获得恒定的结电导率，据我们理解，这是在第一个脉冲阶段结温没有变化的证明。 （2）此时获得的结电导率是结温的量度，因此可以通过与在零电流条件下进行的独立稳态温度测量值进行比较来进行校准。该方法已成功应用于将高功率LED模块热表征为3×3 LED阵列，并在绝缘金属基板（IMS）上建立了颜色转换球状顶部。

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