公开(公告)号：US20140042917A1

公开(公告)日：2014-02-13

申请号：US14058951

申请日：2013-10-21

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Hsing-Chien YANG ,  Wen-Hsin Cheng ,  Ying-Hao Hsu ,  Lan-Ting Hsu ,  Tsung-Hau Chang

IPC: H05B33/08

CPC classification number: H05B33/0806 ,  H05B33/0818 ,  H05B33/0845

Abstract: A light-emitting diode (LED) driving circuit includes an LED control circuit and a power stage circuit. The LED control circuit shifts an input pulse width modulation (PWM) signal toward a higher frequency direction in a frequency domain to generate an output PWM signal having a duty cycle substantially the same as a duty cycle of the input PWM signal. The power stage circuit outputs an LED driving current according to the output PWM signal.

Abstract translation: 发光二极管（LED）驱动电路包括LED控制电路和功率级电路。 LED控制电路在频域中将输入脉宽调制（PWM）信号向较高频率方向移位，以产生具有与输入PWM信号的占空比基本相同的占空比的输出PWM信号。 功率级电路根据输出PWM信号输出LED驱动电流。

公开(公告)号：US09119249B2

公开(公告)日：2015-08-25

申请号：US14058951

申请日：2013-10-21

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Hsing-Chien Yang ,  Wen-Hsin Cheng ,  Ying-Hao Hsu ,  Lan-Ting Hsu ,  Tsung-Hau Chang

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0806 ,  H05B33/0818 ,  H05B33/0845

Abstract: A light-emitting diode (LED) driving circuit includes an LED control circuit and a power stage circuit. The LED control circuit shifts an input pulse width modulation (PWM) signal toward a higher frequency direction in a frequency domain to generate an output PWM signal having a duty cycle substantially the same as a duty cycle of the input PWM signal. The power stage circuit outputs an LED driving current according to the output PWM signal.

Abstract translation: 发光二极管（LED）驱动电路包括LED控制电路和功率级电路。 LED控制电路在频域中将输入脉宽调制（PWM）信号向较高频率方向移位，以产生具有与输入PWM信号的占空比基本相同的占空比的输出PWM信号。 功率级电路根据输出PWM信号输出LED驱动电流。