SEPIC PFC变换器馈电LED驱动器

A. Jha, Bhim Singh
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引用次数: 6

摘要

提出了一种基于单端初级电感变换器(SEPIC)馈电功率因数校正(PFC)的发光二极管(LED)驱动器。该应用需要用于投影应用的高亮度LED控制。脉冲宽度调制(PWM)方案用于LED亮度控制。为了更好地控制LED的电能质量,提出了一种工作在电感电流断续模式下的SEPIC变换器作为功率因数校正器。SEPIC PFC变换器为双反激式dc - dc变换器提供恒定直流电压。双反激DC-DC转换器为强制冷却单元和基于同步降压的恒流多串LED驱动单元提供恒定的低电压隔离。采用强制冷却装置,控制LED温度接近环境温度,延长LED寿命,实现色彩匹配。基于同步降压的LED驱动器用于控制LED亮度,实现LED驱动的恒流。提出了一个原型的LED驱动器的开发和实验验证。在通用交流电源(90 V-265 V)的额定和轻载条件下,对所提出的LED驱动器的电能质量参数进行了评估,发现PFC和总谐波失真(THD)在国际谐波标准IEC 61000-3-2的可接受范围内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SEPIC PFC converter fed LED driver
This paper presents a single ended primary inductance converter (SEPIC) fed power factor correction (PFC) based light emitting diode (LED) driver. The application is needed for high brightness LED control for projection application. A pulse width modulation (PWM) scheme is used for LED brightness control. In order to control LED with better power quality a SEPIC converter is proposed as a power factor corrector which works in discontinuous output inductor current mode (DICM).The SEPIC PFC converter feeds constant dc voltage to bi-flyback DC-DC converter. The bi-flyback DC-DC converter supplies constant low voltage with isolation required to the forced cooling unit and the synchronous buck based constant current multi-string LED driving unit. The forced cooling unit is introduced to control LED temperature near ambient to increase life of LED and matching color. The synchronous buck based LED driver is used to control LED brightness and fulfills the constant current for LED driving. A prototype of the proposed LED driver is developed and experimentally verified. The power quality parameters of the proposed LED driver are evaluated at rated and light load conditions for universal AC mains (90 V-265 V). The PFC and total harmonic distortion (THD) are found within acceptable ranges of international harmonic standard IEC 61000-3-2.
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