首页>
外国专利>
DIMMING CONTROL CIRCUIT, DIMMING CONTROL METHOD AND LED DRIVER THEREOF
DIMMING CONTROL CIRCUIT, DIMMING CONTROL METHOD AND LED DRIVER THEREOF
展开▼
机译:调光控制电路,调光控制方法及其LED驱动器
展开▼
页面导航
摘要
著录项
相似文献
摘要
A dimming control circuit for an LED driver, can include: an adjusting circuit configured to generate an adjusting signal in accordance with a PWM dimming signal; and where a switching state of a power transistor of the LED driver is adjusted in accordance with the adjusting signal and a constant current control signal. A dimming control method for an LED driver, can include: determining a first threshold in accordance with a frequency of the PWM dimming signal and a frequency range of audio noise; generating an adjusting signal having a first duty cycle when a duty cycle of a PWM dimming signal is not greater than the first threshold; and controlling, by the adjusting signal, a switching state of a power transistor in the LED driver, where the first duty cycle is greater than the duty cycle of the PWM dimming signal.
展开▼