US 11,032,881 B2Granted

Controller for controlling light source module

AssigneeO2Micro, Inc.

InventorsRong Hu, Yung-Lin Lin, Hiroshi Yamazaki, Naoyuki Fujita

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Abstract

A controller for controlling a light source module including a first LED array and a second LED array includes a power input terminal, a first power output terminal and a second power output terminal. The power input terminal is operable for receiving electric power from a power converter. The first power terminal is coupled to the first LED array, and the second power output terminal is coupled to the second LED array. The controller is operable for delivering the electric power to the first LED array via the first power output terminal in a first sequence of discrete time slots, and for delivering the electric power to the second LED array via the second power output terminal in a second sequence of discrete time slots. The first sequence of discrete time slots and the second sequence of discrete time slots are mutually exclusive.

Claims11

Dependent claims

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 power input terminal, operable for receiving electric power from a power converter;
a first power output terminal, coupled to said first LED array,
a second power output terminal, coupled to said second LED array,
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 power output terminal,
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 power output terminal,
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,
wherein said controller is operable for delivering said electric power to said first LED array via said first power output terminal in a first sequence of discrete time slots, and for delivering said electric power to said second LED array via said second power output terminal 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.

5 more elements

A controller, coupled to a power source, 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 switching module, coupled to said first LED array and said second LED array, operable for alternately delivering electric power to said first LED array and to said second LED array;
and
a current regulation module, coupled to said first LED array and to said second LED array, operable for linearly regulating a current of each LED string in said first LED array and a current of each LED string in said second LED array,
wherein said switching module comprises:
a first switch, coupled between said power source and said first LED array;
and
a second switch, coupled between said power source and said second LED array;
wherein said controller is operable for turning on said first switch in a first sequence of discrete time slots, and for turning on said second switch 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;
wherein anodes of said first plurality of LED strings are connected to a first common node, wherein said first common node is connected to a first power output terminal of said controller, wherein said first power output terminal is coupled to said first LED array;
wherein anodes of said second plurality of LED strings are connected to a second common node, wherein said second common node is connected to a second power output terminal of said controller, wherein said second power output terminal is coupled to said second LED array;
and
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 a plurality of current sensing terminals of said controller, and wherein said current sensing terminals are coupled to said first LED array and said second LED array and are operable for sensing a current of each LED string in said first LED array and a current of each LED string in said second LED array.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/518,316Filed 22 Jul 2019
Published: US 2021/0029788 A128 Jan 2021
Granted: 8 Jun 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H05B 45/10
Circuit arrangements for operating light-emitting diodes [LED]: controlling the intensity of the light
H05B 45/395
Driver circuits: linear regulators
H05B 39/047
Continuously: with pulse width modulation from a DC power source
H05B 45/14
Controlling the intensity of the light: using electrical feedback from LEDs or from LED modules