Lighting system with lighting dimmer output mapping

• US 8,536,794 B2
• Filed: 05/29/2009
• Issued: 09/17/2013
• Est. Priority Date: 03/12/2007
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Melanson, John L., Paulos, John J.
• Primary Examiner(s): VU, JIMMY T
• Application Number:
  US12/474,714
• Publication Number:
  US 20100060202A1
• Time in Patent Office: 1,572 Days
• Field of Search: 315/200.R, 315/246, 315/247, 315/291, 315/307, 315/DIG.4
• US Class Current: 315/291
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: H05B 47/165 following a pre-assigned programmed sequence; Logic control [LC]

Abstract

A system and method map dimming levels of a lighting dimmer to light source control signals using a predetermined lighting output function. The dimmer generates a dimmer output signal value. At any particular period of time, the dimmer output signal value represents one of multiple dimming levels. In at least one embodiment, the lighting output function maps the dimmer output signal value to a dimming value different than the dimming level represented by the dimmer output signal value. The lighting output function converts a dimmer output signal values corresponding to measured light levels to perception based light levels. A light source driver operates a light source in accordance with the predetermined lighting output function. The system and method can include a filter to modify at least a set of the dimmer output signal values prior to mapping the dimmer output signal values to a new dimming level.

Claims

1. A method for mapping dimming output signal values of a lighting dimmer using a predetermined lighting output function and operating a light source in response to mapped dimming output signal values, the method comprising:

receiving a dimmer output signal, wherein values of the dimmer output signal represent duty cycles having a range of within approximately 95% to 10% of a full duty cycle corresponding to an intensity range of light output from the light source of less than approximately 95% to 10% of a full intensity range of light output from the light source;

mapping the dimmer output signal values to light source control signals using the predetermined lighting output function, wherein the predetermined lighting output function maps the dimmer output signal values to the light source control signals to provide an intensity range of light output from the light source of greater than 95% to less than 5% of a full intensity range of light output from the light source; and

operating a light source in accordance with the light source control signals.

2. The method of claim 1 wherein mapping the dimmer output signal values further comprises mapping the dimmer output signal values to light source control signals using the predetermined lighting output function, wherein the predetermined lighting output function maps the dimmer output signal values to the light source control signals to provide an intensity range of light output from the light source of greater than 95% to less than or equal to 2% of a full intensity range of light output from the light source.

3. A method for mapping dimming output signal values of a lighting dimmer using a predetermined lighting output function and driving a light source in response to mapped dimmer output signal values, the method comprising:

receiving a dimmer output signal, wherein values of the dimmer output signal represent one of multiple dimming levels;

applying a signal processing function to alter transition timing from a first light source intensity level to a second light source intensity level as indicated by a transition of the values of the dimmer output signal to a transition timing in accordance with the predetermined lighting output function;

mapping the dimmer output signal values to light source control signals using the predetermined lighting output function; and

operating a light source in accordance with signals derived from the light source control signals.

4. The method of claim 3 wherein applying a signal processing function to alter transition timing from a first light source intensity level to a second light source intensity level comprises filtering at least a set of dimmer output signal values prior to mapping the dimmer output signal values.

5. The method of claim 3 wherein applying a signal processing function to alter transition timing from a first light source intensity level to a second light source intensity level comprises filtering at least a set of values of the light source control signals prior to generate the signals derived from the light source control signals.

6. The method of claim 3 wherein applying a signal processing function to alter transition timing from a first light source intensity level to a second light source intensity level further comprises:

low pass filtering the dimmer output signal values representing dimming levels below a predetermined threshold level to decrease a rate of change in the perceived light of the light source indicated dimmer output signal values.

7. The method of claim 6 wherein low pass filtering at least a set of dimmer output signal values prior to mapping the dimmer output signal values further comprises:

filtering the dimmer output signal values using a filter function that generates an approximately linear relationship between the dimmer output values and perceived light output of the light source.

8. The method of claim 3 further comprising:

detecting the dimming levels represented by the values of the dimmer output signal.

9. The method of claim 3 wherein the light source includes one or more lighting elements selected from the group consisting of:

one or more light emitting diodes, one or more gas discharge lamps, and one or more incandescent lamps.

10. The method of claim 3 wherein the dimmer output signal value is a phase angle of the dimmer output voltage during a cycle of the dimmer output signal.

11. A lighting system comprising:

one or more input terminals to receive a dimmer output signal, wherein values of the dimmer output signal represent one of multiple dimming levels;

a filter to apply a signal processing function to alter transition timing from a first light source intensity level to a second light source intensity level as indicated by a transition of the values of the dimmer output signal to a transition timing in accordance with the predetermined lighting output function;

circuitry to map the dimmer output signal values to light source control signals using a predetermined lighting output function; and

a light source driver to operate a light source in accordance with signals derived from the light source control signals.

12. The lighting system of claim 11 wherein the filter is configured to filter at least a set of dimmer output signal values prior to mapping the dimmer output signal values.

13. The lighting system of claim 11 wherein the filter is configured to filter at least a set of light source control signal values to generate the signals derived from the light source control signals.

14. A lighting system for mapping dimming output signal values of a lighting dimmer using a predetermined lighting output function and operating a light source in response to mapped dimming output signal values, the lighting system comprising:

one or more input terminals to receive a dimmer output signal, wherein values of the dimmer output signal represent duty cycles having a range of within approximately 95% to 10% of a full duty cycle corresponding to an intensity range of light output from the light source of less than approximately 95% to 10% of a full intensity range of light output from the light source;

circuitry to map the dimmer output signal values to light source control signals using the predetermined lighting output function, wherein the predetermined lighting output function maps the dimmer output signal values to the light source control signals to provide an intensity range of light output from the light source of greater than 90% to less than 5% of a full intensity range of light output from the light source; and

;

a light source driver to operate a light source in accordance with the light source control signals.

15. The lighting system of claim 14 wherein circuitry to map the dimmer output signal values is further configured to map the dimmer output signal values to light source control signals using the predetermined lighting output function, wherein the predetermined lighting output function maps the dimmer output signal values to the light source control signals to provide an intensity range of light output from the light source of greater than 95% to less than or equal to 2% of a full intensity range of light output from the light source.

16. The lighting system of claim 14 further comprising:

a filter to filter at least a set of dimmer output signal values prior to mapping the dimmer output signal values.