Light emitting diode driver and method

• US 8,395,328 B2
• Filed: 11/05/2007
• Issued: 03/12/2013
• Est. Priority Date: 11/03/2006
• Status: Expired due to Fees

• Current Assignee: Clipsal Australia Pty., Ltd. (Schneider Electric SE)
• Original Assignee: Clipsal Australia Pty., Ltd. (Schneider Electric SE)
• Inventors: Quick, Ashleigh Glen, Newman, Andrew
• Primary Examiner(s): A, Minh D
• Application Number:
  US12/447,945
• Publication Number:
  US 20100102734A1
• Time in Patent Office: 1,954 Days
• Field of Search: 315/291, 315/292, 315/293, 315/294, 315/295, 315/307, 315/308, 315/309, 315/311, 315/312, 315/314, 315/315, 315/316, 315/318, 315/321, 315/323, 315/324, 315/325, 315/185.R
• US Class Current: 315/291
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/14 Semiconductor devices, e.g. diodes
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: H05B 47/18 via data-bus transmission

Abstract

Disclosed is a method and apparatus for controlling a plurality of Light Emitting Diodes (LEDs). A communications protocol is also provided, which comprises a START code, a first Command packet and at least one subsequent Command packet. An LED driver receives a signal according to the protocol, and separates the first Command packet from the signal and controls an LED associated with the LED driver in accordance with instructions in the first Command packet. The LED driver then outputs the remaining signal for use by one or more subsequent LED drivers.

Claims

1. A communications protocol for use in controlling a plurality of Light Emitting Diodes (LEDs) associated with respective LED drivers, the communications protocol comprising:

a first Command packet containing at least one instruction for controlling a first of the plurality of LEDs, and at least one subsequent Command packet containing instructions for controlling at least one subsequent LED, connected in series with the first LED; and

a START code provided prior to the first Command packet, the START code for communication to each of the LED drivers to indicate the respective subsequent Command packet.

2. The communications protocol as claimed in claim 1,

wherein at least one of the first and subsequent Command packets contains instructions for controlling a plurality of elements within a respective LED.

3. A Light Emitting Diode (LED) driver, comprising:

an input for receiving a signal according to the communications protocol as claimed in claim 2;

means for controlling an associated LED in accordance with the at least one instruction in the first Command packet; and

an output for outputting the at least one subsequent Command packet.

4. A Light Emitting Diode (LED) driver, comprising:

an input for receiving a signal according to the communications protocol as claimed in claim 1;

means for controlling an associated LED in accordance with the at least one instruction in the first Command packet; and

an output for outputting the at least one subsequent Command packet.

5. The Light Emitting Diode (LED) driver as claimed in claim 4, further comprising:

means for separating the first Command packet from the signal.

6. The Light Emitting Diode (LED), comprising:

the LED driver as claimed in claim 4.

7. An electronic device, comprising:

a plurality of Light Emitting Diodes (LEDs);

a plurality of LED drivers for controlling a respective one of the plurality of Light Emitting Diodes, each LED driver comprising;

an input for receiving a signal according to the communications protocol as claimed in claim 1;

means for controlling an associated LED in accordance with the at least one instruction in the first Command packet; and

an output for outputting the at least one subsequent Command packet; and

a microprocessor for generating and outputting a signal according to the communications protocol as claimed in claim 1 to a first of the plurality of LED drivers.

8. A device for controlling a plurality of LEDs, the device comprising:

means for generating and outputting a signal comprising a START code, a first Command packet, and at least one subsequent Command packet;

first means for receiving the signal and controlling an LED associated with the first means in accordance with instructions in the first Command packet;

first means for separating the first Command packet from the signal to provide a remaining signal including the START code; and

means for outputting the remaining signal,

wherein the START code is provided prior to the first Command packet, and

wherein the START code is included in the remaining signal to indicate a subsequent Command packet.

9. The device as claimed in claim 8,

wherein the means for generating is a microprocessor.

10. The device as claimed in claim 9,

wherein the first means for receiving and controlling, the first means for separating and the means for outputting comprise an LED driver.

11. The device as claimed in claim 10,

wherein the LED driver is a microprocessor.

12. The device as claimed in claim 10, further comprising:

at least one subsequent driver associated with at least one subsequent LED.

13. A method for controlling a plurality of LEDs, the method comprising:

generating and outputting a signal comprising a START code, a first Command packet and at least one subsequent Command packet;

receiving the signal and controlling an LED in accordance with instructions in the first Command packet;

separating the first Command packet from the signal to provide a remaining signal including the START code; and

outputting the remaining signal,

wherein the START code is provided prior to the first Command packet, and

wherein the START code is included in the remaining signal to indicate a subsequent Command packet.

14. A non-transitory machine readable medium containing machine executable instructions to perform the method of claim 13.