公开(公告)号：US20140354163A1

公开(公告)日：2014-12-04

申请号：US14066268

申请日：2013-10-29

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chih-Feng Huang ,  Kuo-Chin Chiu

IPC: H05B33/08

CPC classification number: H05B33/083

Abstract: An LED driving device includes: a rectifying circuit for outputting a DC voltage to a string of M LED units; (M−1) first switching circuits each coupled between a corresponding one of first to (M−1)th LED units and ground; and a second switching circuit coupled between an Mth LED unit and ground. When the DC voltage is sufficient to turn on first to kth LED units, where 1≦k≦M, the kth LED unit is coupled to ground through first and second conductive paths provided by a resistor unit, and a corresponding first switching circuit or the second switching circuit, and each of the first to (k−1)th LED units is coupled to ground through a third conductive path provided by a corresponding first switching circuit and the resistor unit.

Abstract translation: 一种LED驱动装置，包括：整流电路，用于向一串M LED单元输出DC电压; （M-1）个第一开关电路，每个第一开关电路分别耦合在第一至第（M-1）个LED单元中的相应一个LED单元和地之间; 以及耦合在第M个LED单元和地之间的第二开关电路。 当直流电压足以使第一至第九LED单元接通时，其中第一LED单元通过由电阻器单元提供的第一和第二导电路径以及相应的第一开关电路或 第二开关电路，并且第一至第（k-1）个LED单元中的每一个通过由相应的第一开关电路和电阻器单元提供的第三导电路径耦合到地。

公开(公告)号：US08907583B1

公开(公告)日：2014-12-09

申请号：US14066268

申请日：2013-10-29

Applicant: Richtek Technology Corp.

Inventor： Chih-Feng Huang ,  Kuo-Chin Chiu

IPC: H05B33/08

CPC classification number: H05B33/083

Abstract: An LED driving device includes: a rectifying circuit for outputting a DC voltage to a string of M LED units; (M−1) first switching circuits each coupled between a corresponding one of first to (M−1)th LED units and ground; and a second switching circuit coupled between an Mth LED unit and ground. When the DC voltage is sufficient to turn on first to kth LED units, where 1≦k≦M, the kth LED unit is coupled to ground through first and second conductive paths provided by a resistor unit, and a corresponding first switching circuit or the second switching circuit, and each of the first to (k−1)th LED units is coupled to ground through a third conductive path provided by a corresponding first switching circuit and the resistor unit.

Abstract translation: 一种LED驱动装置，包括：整流电路，用于向一串M LED单元输出DC电压; （M-1）个第一开关电路，每个第一开关电路分别耦合在第一至第（M-1）个LED单元中的相应一个LED单元和地之间; 以及耦合在第M个LED单元和地之间的第二开关电路。 当直流电压足以使第一至第九LED单元接通时，其中第一LED单元通过由电阻器单元提供的第一和第二导电路径以及相应的第一开关电路或 第二开关电路，并且第一至第（k-1）个LED单元中的每一个通过由相应的第一开关电路和电阻器单元提供的第三导电路径耦合到地。