公开(公告)号：US20150189710A1

公开(公告)日：2015-07-02

申请号：US14585645

申请日：2014-12-30

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Feng Lin ,  Yuedong Chen

IPC: H05B33/08

CPC classification number: H05B33/0818

Abstract: A LED driving circuit, a control circuit and associated current sensing circuit. The control circuit has a sensing circuit, an estimation circuit, an amplifying circuit, a comparing circuit, a zero-cross detection circuit and a logic circuit. The sensing circuit is configured to sense a switching current flowing through at least one switch of a switching circuit to provide a first sensing signal. The estimation circuit is configured to process the first sensing signal to provide a feedback signal, wherein the feedback signal is indicative of a average current signal flowing through a LED. An average current flowing through the LED is regulated by sensing a switching current flowing through at least one switch.

Abstract translation: LED驱动电路，控制电路和相关电流检测电路。 控制电路具有感测电路，估计电路，放大电路，比较电路，零交叉检测电路和逻辑电路。 感测电路被配置为感测流过开关电路的至少一个开关的开关电流以提供第一感测信号。 估计电路被配置为处理第一感测信号以提供反馈信号，其中反馈信号指示流过LED的平均电流信号。 通过感测流过至少一个开关的开关电流来调节流过LED的平均电流。