Hybrid gas discharge lamp-LED lighting system

• US 8,816,588 B2
• Filed: 12/22/2011
• Issued: 08/26/2014
• Est. Priority Date: 06/24/2007
• Status: Expired due to Fees

• Current Assignee: Philips Lighting Holding BV (Signify N.V.)
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Melanson, John L.
• Primary Examiner(s): TRAN, THUY V
• Application Number:
  US13/334,411
• Publication Number:
  US 20120091904A1
• Time in Patent Office: 978 Days
• Field of Search: 315/178, 315/183, 315/291, 315/312, 315/324, 315/360
• US Class Current: 315/178
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: H05B 35/00 Electric light sources using a combination of different types of light generation

Abstract

A lighting system and method combine at least one LED and at least one gas discharge lamp within a common housing. The lighting system includes a control system to dependently operate each LED and each gas discharge lamp during overlapping, non-identical periods of time. In at least one embodiment, the control system can provide light output by activating LEDs during gas discharge preheating operations and thus extend the useful life of each gas discharge lamp. When dimming the lighting system, the control system can reduce current to the gas discharge lamps and one or more gas discharge lamps can be phased out as dimming levels decrease. As dimming levels decrease, one or more of the LEDs can be activated or groups of LEDs can be phased in to replace the light output of the dimmed gas discharge lamps. Thus, the lighting system can reduce power consumption at low dimming levels.

Claims

1. A hybrid gas discharge lamp-light emitting diode (LED) lighting system comprising:

a housing;

an LED retained by the housing;

a gas discharge lamp retained by the housing; and

a control system coupled to the LED and the gas discharge lamp to dependently operate the LED and gas discharge lamp during overlapping, non-identical periods of time to control light intensity to (A) dim at least one of (i) the LED and (ii) the gas discharge lamp at a dimming level from 0 to 100% and intermediate dimming levels in response to a signal received by the lighting system and (B) activate the LED while preheating the gas discharge lamp prior to generation of light output from the gas discharge lamp.

2. The hybrid gas discharge lamp-LED lighting system of claim 1 wherein the gas discharge lamp is a member of a group consisting of:

a fluorescent lamp, a mercury vapor lamp, a low pressure sodium lamp, and a high pressure sodium lamp.

3. The hybrid gas discharge lamp-LED lighting system of claim 1 further comprising multiple LEDs retained by the housing, wherein the control system is also coupled to the multiple LEDs to dependently operate at least one of the LEDs and the gas discharge lamp during overlapping, non-identical periods of time to control light intensity to dim at least one of (i) the LEDs and (ii) the gas discharge lamp at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system.

4. The hybrid gas discharge lamp-LED lighting system of claim 3 wherein the gas discharge lamp is a member of a group consisting of:

a fluorescent lamp, a mercury vapor lamp, a low pressure sodium lamp, and a high pressure sodium lamp.

5. The hybrid gas discharge lamp-LED lighting system of claim 3 further comprising multiple gas discharge lamps retained by the housing, wherein the control system is also coupled to the multiple gas discharge lamps to dependently operate at least one of the LEDs and at least one of the gas discharge lamps during overlapping, non-identical periods of time to control light intensity to dim at least one of (i) the LEDs and (ii) the gas discharge lamps at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system.

6. The hybrid gas discharge lamp-LED lighting system of claim 1 wherein the control system is further configured to adjust drive current to the LED from 0 to 100% including intermediate values in response to the signal.

7. The hybrid gas discharge lamp-LED lighting system of claim 6 wherein the control system is further configured to control an ON and OFF state of the LED and the gas discharge lamp in response to the signal.

8. The hybrid gas discharge lamp-LED lighting system of claim 1 further comprising multiple LEDs retained by the housing, wherein the control system is further configured to adjust drive current to the LEDs from 0 to 100% including intermediate values in response to the signal.

9. The hybrid gas discharge lamp-LED lighting system of claim 1 wherein the control system is further configured to activate the LED prior to activating the gas discharge lamp when the lighting system is turned ‘

on’

.

10. The hybrid gas discharge lamp-LED lighting system of claim 1 wherein the signal is a dimming signal.

11. The hybrid gas discharge lamp-LED lighting system of claim 10 wherein the dimming signal is generated by a dimmer.

12. A method of controlling a hybrid gas discharge lamp-light emitting diode (LED) lighting system, the method comprising:

receiving a signal; and

operating an LED and a gas discharge lamp dependently during overlapping, non-identical periods of time to control light intensity to (A) dim at least one of (i) the LED and (ii) the gas discharge lamp at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system and (B) activate the LED while preheating the gas discharge lamp prior to generation of light output from the gas discharge lamp, wherein the LED and the gas discharge lamp are retained in a housing.

13. The method of claim 12 wherein the gas discharge lamp is a member of a group consisting of:

a fluorescent lamp, a mercury vapor lamp, a low pressure sodium lamp, and a high pressure sodium lamp.

14. The method of claim 12 wherein the housing further retains multiple LEDs, the method further comprising:

operating at least one of the multiple LEDs and the gas discharge lamp dependently during overlapping, non-identical periods of time to control light intensity to dim at least one of (i) the multiple LEDs and (ii) the gas discharge lamp at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system.

15. The method of claim 14 wherein the gas discharge lamp is a member of a group consisting of:

a fluorescent lamp, a mercury vapor lamp, a low pressure sodium lamp, and a high pressure sodium lamp.

16. The method of claim 14 wherein the housing further retains multiple gas discharge lamps, the method further comprising:

operating at least one of the multiple LEDs and at least one of the gas discharge lamps dependently during overlapping, non-identical periods of time to control light intensity to dim at least one of (i) the LEDs and (ii) the gas discharge lamps at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system.

17. The method of claim 12 further comprising:

adjusting drive current to the LED from 0 to 100% including intermediate values in response to the signal.

18. The method of claim 17 further comprising:

controlling an ON and OFF state of the LED and the gas discharge lamps in response to the signal.

19. The method of claim 12 wherein the housing further retains multiple LEDs, the method further comprising:

adjusting drive current to the multiple LEDs from 0 to 100% including intermediate values in response to the signal.

20. The method of claim 12 further comprising:

activating the LED prior to activating the gas discharge lamp when the lighting system is turned ‘

on’

.

21. The method of claim 12 wherein the signal is a dimming signal.

22. The method of claim 21 wherein the dimming signal is generated by a dimmer.

23. An apparatus to control at least light intensity of a hybrid gas discharge lamp-light emitting diode (LED) lighting system, the controller comprising:

a controller configured to;

receive a signal; and

operate an LED and a gas discharge lamp dependently during overlapping, non-identical periods of time to control light intensity to (A) dim at least one of (i) the LED and (ii) the gas discharge lamp at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the controller and (B) activate the LED while preheating the gas discharge lamp prior to generation of light output from the gas discharge lamp, wherein the LED and the gas discharge lamp are retained in a housing.

24. The apparatus of claim 23 wherein the gas discharge lamp is a member of a group consisting of:

a fluorescent lamp, a mercury vapor lamp, a low pressure sodium lamp, and a high pressure sodium lamp.

25. The apparatus of claim 23 wherein the housing further retains multiple LEDs and the controller is further configured to:

operate at least one of the multiple LEDs and the gas discharge lamp dependently during overlapping, non-identical periods of time to control light intensity to dim at least one of (i) the LEDs and (ii) the gas discharge lamp at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system.

26. The apparatus of claim 23 wherein the gas discharge lamp is a member of a group consisting of:

a fluorescent lamp, a mercury vapor lamp, a low pressure sodium lamp, and a high pressure sodium lamp.

27. The apparatus of claim 23 wherein the housing further retains multiple gas discharge lamps and the controller is further configured to:

operate at least one of the multiple LEDs and at least one of the gas discharge lamps dependently during overlapping, non-identical periods of time to control light intensity to dim at least one of (i) the LEDs and (ii) the gas discharge lamps at a dimming level from 0 to 100% and intermediate dimming levels in response to the signal received by the lighting system.

28. The apparatus of claim 23 wherein the controller is further configured to adjust drive current to the LED from 0 to 100% including intermediate values in response to the dimming signal.

29. The apparatus of claim 23 wherein the controller is further configured to:

control an ON and OFF state of the LED and the gas discharge lamps in response to the signal.

30. The apparatus of claim 23 wherein the housing further retains multiple LEDs and the controller is further configured to adjust drive current to the multiple LEDs from 0 to 100% including intermediate values in response to the signal.

31. The apparatus of claim 23 wherein the controller is further configured to:

activate the LED prior to activating the gas discharge lamp when the lighting system is turned ‘

on’

.

32. The apparatus of claim 23 wherein the signal is a dimming signal.

33. The apparatus of claim 32 wherein the dimming signal is generated by a dimmer.