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由于交流发光二极管(AC-LED)在实际应用中无需交流/直流整流变压器,它的发展越来越被关注。随着器件功率的增大,芯片结温升高,对器件的光通量、光功率及寿命等产生负面影响,所以精确掌握AC-LED的温升规律就成为芯片设计的关键。运用FloEFD有限元软件进行模拟仿真1 W白光AC-LED分别在直流和交变功率驱动下的瞬态热特性,结果表明在加载交变信号情况下,器件结温会以直流信号的结温为中心周期振荡,振荡的频率与输入功率频率相同,但有明显的相位移动。同时,AC-LED在不同的输入功率和频率下的结温变化显示稳态时的平均结温和结温振荡幅度都随功率的增大而线性上升,但随着频率的增大而降低。
Due to the fact that AC-LED does not need AC / DC rectifier transformer in practical application, its development is getting more and more attention. As the device power increases, the chip junction temperature increases, the device luminous flux, optical power and life have a negative impact, so a precise grasp of the AC-LED temperature rise has become the key to chip design. Simulation results using FloEFD finite element software The transient thermal characteristics of 1 W white AC-LED driven by DC and AC power respectively show that the junction temperature of the device under the condition of loading alternating signal will depend on the junction temperature of DC signal The center cycle oscillates with the same frequency as the input power but with significant phase shift. At the same time, the average junction temperature and the junction temperature oscillation amplitude of the AC-LED at different input power and frequency show that the average junction temperature and the junction temperature oscillation amplitude increase linearly with the increase of power, but decrease with the increase of the frequency.