公开(公告)号：US20140035479A1

公开(公告)日：2014-02-06

申请号：US13649767

申请日：2012-10-11

Applicant: National Applied Research Laboratories

Inventor： Yuan-Ta HSIEH ,  Chiao-Li Fang ,  Jian-Fu Wu ,  Hann-Huei Tsai ,  Ying-Zong Juang

IPC: H05B37/02

CPC classification number: H05B33/089

Abstract: An LED driver circuit structure with over-current suppression is provided. The LED driver circuit includes a DC-DC converter, a voltage detector, a reference voltage supplier module, an error amplifier, a comparator, and an SR-latch. The LED driver circuit structure controls the output voltage and thus the output current of the DC-DC converter by multi-step switching of reference voltages and current levels to achieve over-current suppression, thereby extending an LED endurance period and increasing a PWM dimming frequency range for LED brightness control applications.

Abstract translation: 提供了具有过电流抑制的LED驱动电路结构。 LED驱动器电路包括DC-DC转换器，电压检测器，参考电压供应器模块，误差放大器，比较器和SR锁存器。 LED驱动器电路结构通过参考电压和电流电平的多步切换来控制DC-DC转换器的输出电压和输出电流，以实现过电流抑制，从而延长LED持续时间并增加PWM调光频率 范围适用于LED亮度控制应用。