US 11,930,568 B2
Controller for controlling a light source module
Rong Hu, Beijing (CN); Yung-Lin Lin, Palo Alto, CA (US); and Naoyuki Fujita, Tokyo (JP)
Assigned to O2Micro Inc., Santa Clara, CA (US)
Filed by O2Micro, Inc., Santa Clara, CA (US)
Filed on May 6, 2021, as Appl. No. 17/313,709.
Application 17/313,709 is a continuation in part of application No. 16/518,316, filed on Jul. 22, 2019, granted, now 11,032,881.
Prior Publication US 2021/0259073 A1, Aug. 19, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H05B 45/14 (2020.01); H05B 45/397 (2020.01); H05B 45/46 (2020.01)
CPC H05B 45/14 (2020.01) [H05B 45/397 (2020.01); H05B 45/46 (2020.01)] 25 Claims
OG exemplary drawing
 
1. A controller operable for controlling a light source module comprising a first Light-Emitting Diode (LED) array and a second LED array, wherein said first LED array comprises a first plurality of LED strings and said second LED array comprises a second plurality of LED strings, said controller comprising:
a first driving terminal, coupled to a first switch, wherein said first switch is coupled between a power converter and said first LED array;
a second driving terminal, coupled to a second switch, wherein said second switch is coupled between said power converter and said second LED array; and
a plurality of current sensing terminals, coupled to said first LED array and to said second LED array, operable for sensing a current of each LED string in said first LED array and for sensing a current of each LED string in said second LED array,
wherein anodes of said first plurality of LED strings are connected to a first common node, wherein said first common node is connected to said first switch,
wherein anodes of said second plurality of LED strings are connected to a second common node, wherein said second common node is connected to said second switch,
wherein a cathode of a first LED string in said first LED array and a cathode of a first LED string in said second LED array are connected to a third common node,
wherein said third common node is connected to a first current sensing terminal of said current sensing terminals, and
wherein said controller is operable for turning on said first switch by said first driving terminal to deliver electric power from said power converter to said first LED array in a first sequence of discrete time slots, and for turning on said second switch by said second driving terminal to deliver electric power from said power converter to said second LED array in a second sequence of discrete time slots, wherein said first sequence of discrete time slots and said second sequence of discrete time slots are mutually exclusive.