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Forward Conduction Mode Controlled Piezoelectric Transformer-Based PFC LED Drive

机译:基于正向传导模式控制压电变压器的pFC LED驱动器

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摘要

Light-emitting diode (LED) illumination is getting more and more common; as LED's performance is rising, the price is falling and is getting competitive. Some of the challenges of ac mains supplied illumination are the requirement of power factor correction (PFC) and the competitiveness of a low priced market. In this paper, a new forward conduction mode (FCM) control method for piezoelectric transformer (PT)-based power converters is proposed. A PT-based LED drive facilitating passive PFC is developed, utilizing and validating the FCM control method. The drive utilizes an inductorless half-bridge topology and for circuit minimization and simplicity it has no load regulation and has a 100-Hz output modulation. The proposed FCM control method ensures that the PT is operated at its optimal operation frequency, which ensures soft-switching operation and a constant gain. As a result a 6.5-W PT-based PFC LED drive has been developed, supplied from 230-V 50-Hz ac mains, achieving a power factor of 0.96.
机译:发光二极管(LED)的照明越来越普遍。随着LED的性能不断提高,价格不断下降,并且具有竞争力。交流电源照明的一些挑战是对功率因数校正(PFC)的要求以及低价市场的竞争力。本文提出了一种新的基于压电变压器(PT)的功率变换器正向传导模式(FCM)控制方法。利用并验证了FCM控制方法,开发了一种有助于无源PFC的基于PT的LED驱动器。该驱动器采用无电感器的半桥拓扑结构,并且为了使电路最小化和简化,它没有负载调节,并具有100Hz的输出调制。所提出的FCM控制方法可确保PT以其最佳工作频率工作,从而确保软开关操作和恒定增益。结果,开发了一种基于6.5 W PT的PFC LED驱动器,该驱动器由230 V 50 Hz交流电源供电,功率因数达到0.96。

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