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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >A Novel Control Scheme of Quasi-Resonant Valley-Switching for High-Power-Factor AC-to-DC LED Drivers
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A Novel Control Scheme of Quasi-Resonant Valley-Switching for High-Power-Factor AC-to-DC LED Drivers

机译：高功率因数AC-DC LED驱动器的准谐振谷值开关的新型控制方案

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摘要

This paper presents a novel control scheme of quasi-resonant (QR) mode and valley-switching for high-power-factor (PF) ac-to-dc light-emitting diode (LED) drivers. The proposed driver control scheme is based on a buck PF corrector converter, which is operated in QR valley-switching. The proposed control scheme can directly sense the QR valley signal from the current sensor, and it is definitely different from the conventional method which senses the QR valley signal from auxiliary winding. The cost and size of the driver circuit can be remarkably reduced when the proposed control scheme is adopted. Furthermore, the proposed circuit can provide not only high PF and low total harmonic distortion but also high conversion efficiency. Up to 0.99 PF and 91.5% efficiency are obtained from an 8-W (40-W replaced) LED bulb driver prototype.
机译：本文提出了一种新的准谐振（QR）模式和谷底开关的高功率因数（PF）交流至直流发光二极管（LED）驱动器控制方案。所提出的驱动器控制方案基于降压PF校正器转换器，该转换器以QR谷底开关方式工作。所提出的控制方案可以直接感测来自电流传感器的QR谷值信号，这与传统方法从辅助绕组感测QR谷值信号的方法肯定不同。当采用所提出的控制方案时，可以显着降低驱动器电路的成本和尺寸。此外，所提出的电路不仅可以提供高PF和低总谐波失真，而且还可以提供高转换效率。从8瓦（替代40瓦）LED灯泡驱动器原型中可获得高达0.99 PF和91.5％的效率。

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