公开(公告)号：US20120081039A1

公开(公告)日：2012-04-05

申请号：US13073095

申请日：2011-03-28

Applicant: TA-YUNG YANG ,  LI LIN ,  CHIH-HSIEN HSIEH ,  CHUH-CHING LI ,  CHI-YIN LO ,  KUO-HSIEM HUANG

Inventor： TA-YUNG YANG ,  LI LIN ,  CHIH-HSIEN HSIEH ,  CHUH-CHING LI ,  CHI-YIN LO ,  KUO-HSIEM HUANG

IPC: H05B37/02

CPC classification number: H05B33/0815

Abstract: A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.

Abstract translation: 根据本发明的LED驱动器的控制电路包括输出电路，输入电路和输入电压检测电路。 输出电路产生开关信号以产生用于响应于反馈信号驱动至少一个LED的输出电流。 开关信号被耦合以切换变压器。 输入电路对输入信号进行采样以产生反馈信号。 输入信号与LED驱动器的输出电流相关。 输入电压检测电路根据LED驱动器的输入电压产生输入电压信号。 当输入电压信号低于阈值时，输入电路不会对输入信号进行采样。 控制电路可以消除输入电容器的需要，提高LED驱动器的可靠性。

公开(公告)号：US08432109B2

公开(公告)日：2013-04-30

申请号：US13073095

申请日：2011-03-28

Applicant: Ta-Yung Yang ,  Li Lin ,  Chih-Hsien Hsieh ,  Chuh-Ching Li ,  Chi-Yin Lo ,  Kuo-Hsiem Huang

Inventor： Ta-Yung Yang ,  Li Lin ,  Chih-Hsien Hsieh ,  Chuh-Ching Li ,  Chi-Yin Lo ,  Kuo-Hsiem Huang

IPC: H05B37/02

CPC classification number: H05B33/0815

Abstract: A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.

Abstract translation: 根据本发明的LED驱动器的控制电路包括输出电路，输入电路和输入电压检测电路。 输出电路产生开关信号以产生用于响应于反馈信号驱动至少一个LED的输出电流。 开关信号被耦合以切换变压器。 输入电路对输入信号进行采样以产生反馈信号。 输入信号与LED驱动器的输出电流相关。 输入电压检测电路根据LED驱动器的输入电压产生输入电压信号。 当输入电压信号低于阈值时，输入电路不会对输入信号进行采样。 控制电路可以消除输入电容器的需要，提高LED驱动器的可靠性。