Modular programmable lighting ballast

• US 7,915,837 B2
• Filed: 04/06/2009
• Issued: 03/29/2011
• Est. Priority Date: 04/08/2008
• Status: Active Grant

• Current Assignee: Lumetric Lighting, Inc.
• Original Assignee: Lumetric, Inc.
• Inventors: Davis, Gregory, Shloush, Moshe
• Primary Examiner(s): Owens; Douglas W
• Assistant Examiner(s): A; Minh D
• Application Number:
  US12/418,755
• Publication Number:
  US 20100244721A1
• Time in Patent Office: 722 Days
• Field of Search: 315/291, 315/307, 315/292, 315/293, 315/294, 315/295, 315/308, 315/309, 315/310, 315/311
• US Class Current: 315/291
• CPC Class Codes: H05B 41/28 using static converters

Abstract

A lighting ballast is programmable as to input and output parameters. Both operational characteristics and sensed data are used to control the ballast parameters. The ballast is configured to recapture as electrical energy heat produced by the lamp. The ballast is constructed in modular fashion with a power factor correction circuit module and a ballast control circuit module that snap together to achieve a large number of input voltage and lamp type variations with a small number of separate units.

Claims

1. A luminaire, comprising:

a lamp;

a processor;

a power factor correction circuit configured to operate at an operating frequency, receive a main power supply, and generate an intermediate power supply based on said operating frequency; and

a ballast operatively coupled to said lamp, configured to receive said intermediate power supply, and generate a lamp power supply based on a control waveform;

wherein said processor can adjust said operating frequency, sense said main power supply, calculate a best fit operating frequency based on said main power supply and a stored table of values containing a set of values, and adjust said operating frequency to said best fit operating frequency; and

wherein each of said values in said stored table of values is a best fit operating frequency given a set main power supply.

2. The luminaire of claim 1, wherein said processor can adjust both said control waveform and said operating frequency.

3. The luminaire of claim 1, further comprising:

a data port configured to communicate with said processor, and communicate with an external device;

wherein said processor adjusts said control waveform or said operating frequency based on information obtained from said data port.

4. The luminaire of claim 1, wherein said processor is configured to:

sense said intermediate power supply;

calculate a best fit operating frequency based on said intermediate power supply; and

adjust said operating frequency to said best fit operating frequency.

5. The luminaire of claim 4, wherein said power factor correction circuit achieves near-equal efficiency across a range of potential characteristics of said main power supply.

6. The luminaire of claim 1, wherein said processor is configured to:

sense a set of at least one operating conditions of said lamp;

calculate a desired waveform necessary to keep a desired lamp parameter within a desired range based on said set of at least one operating conditions; and

adjust said control waveform to said desired waveform.

7. The luminaire of claim 6, wherein:

an operating condition in said set of at least one operating conditions is a wattage of said lamp; and

said desired lamp parameter is also said wattage of said lamp.

8. The luminaire of claim 6, wherein said processor is configured to:

log said set of at least one operating conditions of said lamp in a data file; and

calculate said desired waveform based on said data file.

9. A method of providing a lamp power supply to a lamp comprising the steps of:

generating an intermediate power supply from a main power supply using a power factor correction circuit based on an operating frequency of said power factor correction circuit;

generating said lamp power supply from said intermediate power supply using a ballast based on a control waveform of said ballast;

sensing said main power supply; and

selecting a best fit operating frequency based on said main power supply and a stored table of values containing a set of values using a processor;

wherein said adjusting sets said operating frequency to said best fit operating frequency; and

wherein each of said values in said stored table of values is a best fit operating frequency given a set main power supply.

10. The method of claim 9, wherein said processor adjusts both said control waveform and said operating frequency during said adjusting.

11. The method of claim 9, further comprising the steps of:

sending information to said processor from an external device using a data port;

wherein said processor adjusts one of said control waveform and said operating frequency based on said information.

12. The method of claim 9, further comprising the steps of:

sensing said intermediate power supply; and

calculating a best fit operating frequency based on said intermediate power supply using said processor;

wherein said adjusting sets said operating frequency to said best fit operating frequency.

13. The method of claim 9, further comprising the steps of:

sensing a set of at least one operating conditions of said lamp; and

calculating a desired waveform necessary to keep a desired lamp parameter within a desired range based on said set of at least one operating conditions using said processor;

wherein said adjusting sets said control waveform to said desired waveform.

14. The method of claim 13, further comprising the steps of:

logging said set of at least one operating conditions of said lamp in a data file; and

calculating said desired waveform based on said data file.

15. A luminaire, comprising:

a lamp;

a processor;

a power factor correction circuit configured to receive a main power supply, and generate an intermediate power supply; and

a ballast operatively coupled to said lamp, configured to receive said intermediate power supply, and generate a lamp power supply using a dual gate amplifying drive being driven by a control waveform;

wherein said processor can adjust said control waveform, sense a set of at least one operating conditions of said lamp, calculate a desired waveform necessary to keep a desired lamp parameter within a desired range based on said set of at least one operating conditions, and adjust said control waveform to said desired waveform.

16. The luminaire of claim 15, wherein:

an operating condition in said set of at least one operating conditions is a wattage of said lamp; and

said desired lamp parameter is also said wattage of said lamp.

17. The luminaire of claim 16, wherein said processor is configured to:

log said set of at least one operating conditions of said lamp in a data file; and

calculate said desired waveform based on said data file.