线性驱动LED天花筒灯温升保护实验及建议

Experiment and Suggestionon Temperature Rise Protection of Linear Drive LED Ceiling Downlight

线性高压驱动电源在中小功率LED(Light-Emitting Diode)灯具中的开发应用逐渐成为市场趋势,然而制约LED灯具质量指标的关键技术参数仍没有变,塑包铝壳体成功解决了作为Ⅱ类灯具输出端DC高压通过安规标准(Safety Criterion)要求的难题,但驱动电源IC(Integrated Circuit,集成电路)芯片温升过高同样会加速IC的老化,对IC寿命的影响较大,甚至会出现可靠性问题,且较高环境温度下(如覆棉)频繁出现灯光闪烁的非正常状态,必将给客户带来不良体验,最终引起市场对此驱动技术架构的质疑甚至放弃。本文就出口澳洲(澳大利亚与新西兰)市场中主流驱动IC的温升保护策略进行验证实验设计,并就不同抽样样本所触发的不同保护状态进行比对分析,最终从IC的不同封装批次、电源板外围物料的匹配差异、壳体散热用料及加工工艺差异等方面找出原因并给出解决方案,为此类驱动产品的良性优化、应用发展,提供有益参考。

The development and application of linear high-voltage driving power supply in small and medium power LED lamps has gradually become a market trend. However, the key technical parameters that restrict the quality indicators of LED lamps remain unchanged. The plastic clad aluminum shell successfully solves the problem that the DC high voltage at the output end of class II lamps meets the requirements of safety criteria. However, the high temperature rise of the driving power IC(integrated circuit) will also accelerate the aging of the IC,which has a great impact on the IC life, and even causes reliability problems. In addition, the abnormal state of frequent light flickering under high ambient temperature(such as cotton covering) will certainly bring bad experience to customers, and eventually cause the market to question or even give up this driving technology architecture. This paper verifies the experimental design of the temperature rise protection strategy of mainstream drive ICs exported to Australia(Australia and New Zealand), compares and analyzes the different protection states triggered by different samples sampled, and finally finds out the reasons from different packaging batches of ICs, matching differences of materials around power boards, differences in shell heat dissipation materials and processing technology, and gives solutions. It provides a useful reference for benign optimization and application development of such drive power products.