Po-Yen Lin, T. Liang, Che-wei Chang, Kai-Hui Chen, Bin-Kun Huang
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引用次数: 7
摘要
对于许多LED应用来说，为了节省能源消耗，需要调光控制。然而，由于在低调光水平下的最小导通时间和开关频率，无法实现大范围调光。本文设计并实现了一种buck型宽范围可调光LED驱动器。根据调光比例的不同，降压变换器可以工作在QR模式、谷开关限频模式、降频模式和一次侧控制模式下的突发模式。通过改变PI控制器的参数，在突发模式下仍然可以精确地估计LED电流。因此，提出的主侧控制方案可以实现理想的线性大范围调光。最后，实现了用于42 V/ 8 W LED灯的通用输入电压为90-264 Vrms的buck型LED驱动器。调光范围为100% ~ 1%。100%和1%调光时的线路规则都低于5%。在通用输入电压范围内，功率因数大于0.96，总谐波失真小于20%。最高效率为94.67%。
For many LED applications, the dimming control is required in saving the energy consumptions. However, the wide-range dimming cannot be achieved due to the minimum on-time and switching frequency at low dimming level. In this paper, a buck-type wide-range dimmable LED driver is designed and implemented. According to the different percentage of dimming, the buck converter can operate in QR mode, frequency limitation with the valley switching, frequency reduction mode, and burst mode with the primary-side control scheme. By changing the parameters of the PI controller, the LED current can still be estimated precisely in burst mode. Therefore, the ideally linear wide-range dimming can be achieved by the proposed primary-side control scheme. Finally, the buck-type LED driver with the universal input voltages 90–264 Vrms applied to 42 V/ 8 W LED lamps is implemented. The dimming range is from 100 % to 1 %. The line regulations at 100 % and 1 % dimming are both lower than 5 %. The power factor is higher than 0.96 and the total harmonic distortion is lower than 20 % in the universal input voltage range. The highest efficiency is 94.67%.
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