Patent ID: 11930568
Assignee: O2MICRO INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
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.