Variable On-Time (VOT)-Controlled Critical Conduction Mode Buck PFC Converter for High-Input AC/DC HB-LED Lighting Applications
Variable On-Time (VOT)-Controlled Critical Conduction Mode Buck PFC Converter for High-Input AC/DC HB-LED Lighting Applications
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DOI：
10.1109/tpel.2011.2169812
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发表时间：
2012-11
影响因子：
6.7
通讯作者：
Xinke Wu;Jianyou Yang;Junming Zhang;Z. Qian
中科院分区：
文献类型：
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作者：
Xinke Wu;Jianyou Yang;Junming Zhang;Z. Qian
对于高输入电压（>;264 Vac）AC/DC应用，降压功率因数校正（PFC）转换器是一个很好的选择，因为其输出电压低、效率高、寿命延长，并且通过使用低额定电压（<;200 V）电解电容器来降低成本。然而，由于输入电流的固有死角，降压PFC变换器的谐波较高，限制了其在照明系统中的应用。为了使降压型PFC变换器满足照明应用中的谐波要求（IEC 61000 -3-2，Class C），提出了一种适用于隔离式高亮度LED应用的临界导通模式（CRM）降压型PFC前端变换器的可变导通时间控制器。通过前馈输入电压并调节开关的导通时间，可以减少高次谐波，以满足照明系统的限制。在一台150 W的CRM降压型前端PFC样机上进行的实验结果表明，在满载时，降压型PFC在整个输入电压范围（250-530 Vac）内的效率超过96%，电流谐波含量满足谐波要求。
For high input voltage (>;264 Vac) ac/dc applications, a buck power factor correction (PFC) converter is a good choice because of its low output voltage, high efficiency, lifetime improvement, and cost reduction by using a low voltage rating (<;200 V) electrolytic capacitor. However, due to the inherent dead angle of the input current, the harmonics of the buck PFC converter are high, which limits its application in lighting systems. In order to make the buck PFC converter meet the harmonics requirements (IEC61000-3-2, Class C) in lighting applications, this paper proposes a variable on-time controller for a critical conduction mode (CRM) buck PFC front-end converter for isolated high-brightness LED applications. By feedforwarding the input voltage and regulating the on-time of the switch, the high-order harmonics can be reduced to meet the lighting system limitations. Experimental results obtained on a 150-W CRM buck front-end PFC prototype show that the efficiency of buck PFC exceeds 96% during the entire line input range (250-530 Vac) at full load, and the current harmonics content can meet the harmonic requirements.