Apparatus and system for providing power to solid state lighting

• US 9,894,730 B2
• Filed: 07/26/2016
• Issued: 02/13/2018
• Est. Priority Date: 09/09/2008
• Status: Active Grant

• Current Assignee: Chemtron Research LLC (Intellectual Ventures LLC)
• Original Assignee: Chemtron Research LLC (Intellectual Ventures LLC)
• Inventors: Lethellier, Patrice R.
• Primary Examiner(s): A, Minh D
• Application Number:
  US15/220,207
• Publication Number:
  US 20170019961A1
• Time in Patent Office: 567 Days
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]
• CPC Class Codes: H05B 45/385 using flyback topology
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: H05B 47/105 in response to determined parameters

Abstract

An apparatus and computer readable storage medium are disclosed for supplying power to a load such as a plurality of light emitting diodes. A representative apparatus comprises a primary module, a first secondary module couplable to a first load, and a second secondary module couplable to a second load. The primary module comprises a transformer having a transformer primary. The first secondary module comprises a first transformer secondary magnetically coupled to the transformer primary, and the second secondary module comprises a second transformer secondary magnetically coupled to the transformer primary, with the second secondary module couplable through the first or second load to the first secondary module.

Claims

1. A method of providing power to a plurality of light emitting diodes of a circuit, the method comprising:

energizing a first secondary module and a second secondary module from a transformer of a primary module;

energizing a first light emitting diode by the first secondary module, wherein the first light emitting diode is coupled in series with the first secondary module; and

energizing a second light emitting diode by the second secondary module, wherein the second secondary module is coupled in series with the first light emitting diode and the second light emitting diode, and wherein the circuit is configured to flow a direct current from the second secondary module to the first secondary module and back to the second secondary module;

wherein the first secondary module is configured to have a first voltage polarity, and wherein the first load is configured to have a second voltage polarity opposite the first voltage polarity.

2. The method of claim 1, further comprising:

detecting a fault in the first secondary module or the first light emitting diode; and

in response to the detected fault, flowing a bypass current around the first secondary module and the first light emitting diode from a third light emitting diode to the second secondary module.

3. The method of claim 2, wherein the detected fault comprises an open circuit.

4. The method of claim 2, further comprising:

sensing a current level in at least one of the first or second secondary modules with a current sensor; and

in response to the sensed current level, regulating a primary current in the primary module with a controller coupled to the current sensor and the primary module.

5. The method of claim 4, wherein the controller provides dimming of at least one of the first or second light emitting diodes by regulating the bypass current.

6. The method of claim 4, wherein the controller provides a pulse-width modulated signal to regulate the bypass circuit.

7. The method of claim 4, wherein the controller is optically coupled to the primary module.

8. The method of claim 1, wherein a resultant voltage of the first voltage polarity combined with the voltage of the second voltage polarity is substantially less than a magnitude of the first voltage polarity or the second voltage polarity.

9. The method of claim 1, wherein the second secondary module is configured to have a third voltage polarity, and wherein the second load is configured to have a fourth voltage polarity opposite the third voltage polarity.

10. The method of claim 9, wherein a resultant voltage of a combination of the first voltage polarity, the second voltage polarity, the third voltage polarity, and the fourth voltage polarity is substantially less than a magnitude of the first voltage polarity, the second voltage polarity, the third voltage polarity, or the fourth voltage polarity.

11. A method of providing power to a plurality of light emitting diodes, the method comprising:

generating a first voltage across a first secondary module;

generating a second voltage across a first light emitting diode, wherein the first light emitting diode is coupled in series with the first secondary module, and wherein the first and the second voltages have opposing polarities;

generating a third voltage across a second secondary module, wherein the second secondary module is coupled in series with the first light emitting diode;

generating a fourth voltage across a second light emitting diode, wherein the second light emitting diode is coupled in series with the second secondary module, and wherein the third and the fourth voltages have opposing polarities; and

in response to a detected fault, routing a bypass current through a first bypass circuit coupled to the first secondary module to bypass the first secondary module and the first load.

12. The method of claim 11, wherein the bypass current is a first bypass current, the method further comprising, in response to the detected fault, routing a second bypass current through a second bypass circuit coupled to the second secondary module to bypass the second secondary module and the second load.

13. The method of claim 12, wherein each of the first bypass circuit and the second bypass circuit comprises a switch coupled in parallel with a diode.

14. The method of claim 12, wherein each of the first bypass circuit and the second bypass circuit comprises a zener diode.

15. The method of claim 12, further comprising dimming the first or second light emitting diodes by regulating the first or second bypass circuits.

16. The method of claim 11, wherein the bypass current is further routed to the second light emitting diode.

17. The method of claim 11, further comprising, in response to the detected fault, interrupting a current being provided from the first secondary module to the first light emitting diode.

18. The method of claim 11, wherein the detected fault is a short circuit or an open circuit.

19. The method of claim 11, further comprising:

routing a current from the first secondary module to the first light emitting diode for a first predetermined on-time duration at a first frequency; and

routing a current from the second secondary module to the second light emitting diode for a second predetermined on-time duration at a second frequency.

20. The method of claim 11, wherein a resultant voltage of the first voltage polarity combined with the second voltage polarity is substantially less than a magnitude of the first voltage polarity or the second voltage polarity.

21. The method of claim 11, wherein the first voltage polarity and the second voltage polarity substantially offset each other to provide a comparatively low resultant voltage level.

22. The method of claim 11, wherein a resultant voltage of the combined first voltage polarity, the second voltage polarity, the third voltage polarity, and the fourth voltage polarity is substantially less than a magnitude of the first voltage polarity, the second voltage polarity, the third voltage polarity, or the fourth voltage polarity.