Lighting component with independent DC-DC converters
View Patent ↗The present disclosure relates to a lighting component with multiple DC-DC converters. Each of the DC-DC converters is used to independently drive a corresponding string of LEDs. In general, rectifier circuitry receives an AC power signal and generates a rectified signal, which is provided to first and second converter circuitries. The first converter circuitry converts the rectified signal into a first drive voltage for a first string of LEDs and provides a first drive current for the first string of LEDs based on a first drive current control signal. Similarly, the second converter circuitry converts the rectified signal into a second drive voltage for a second string of LEDs and provides a second drive current for the second string of LEDs based on a second drive current control signal.
1. A system comprising:
rectifier circuitry adapted to receive an AC power signal and provide a rectified signal;
first converter circuitry adapted to convert the rectified signal into a first drive voltage for a first string of LEDs and provide a first drive current for the first string of LEDs based on a first drive current control signal; and
second converter circuitry adapted to convert the rectified signal into a second drive voltage for a second string of LEDs and provide a second drive current for the second string of LEDs based on a second drive current control signal.
2. The system of claim 1 wherein the first converter circuitry comprises a boost type DC-DC converter and the second converter circuitry comprises a boost type DC-DC converter.
3. The system of claim 1 wherein the first converter circuitry comprises a buck type DC-DC converter and the second converter circuitry comprises a boost type DC-DC converter.
4. The system of claim 1 wherein the first converter circuitry comprises a buck type DC-DC converter and the second converter circuitry comprises a buck type DC-DC converter.
5. The system of claim 1 wherein at least one of the first and second converter circuitries comprises a buck-boost type DC-DC converter.
6. The system of claim 1 wherein the first converter circuitry comprises a first DC-DC converter and the second converter circuitry comprises a second DC-DC converter, which is independent of the first DC-DC converter.
7. The system of claim 1 wherein the first string of LEDs comprises a plurality of LEDs of a first color and the second string of LEDs comprises a plurality of LEDs of a second color that is different than the first color.
8. The system of claim 7 wherein the plurality of LEDs of the first color are red LEDs and the plurality of LEDs of the second are at least one of blue-shifted green and blue-shifted yellow LEDs.
9. The system of claim 7 wherein the first drive voltage is different than the second drive voltage.
10. The system of claim 9 wherein the first drive current is different than the second drive current.
11. The system of claim 1 wherein the first drive current is different than the second drive current.
12. The system of claim 1 wherein the first drive current is controlled independently of the second drive current.
13. The system of claim 1 further comprising first current control circuitry adapted to provide the first drive current control signal based on a first current control signal provided by main control circuitry, and second current control circuitry adapted to provide the second drive current control signal based on a second current control signal provided by the main control circuitry.
14. The system of claim 13 wherein the first converter circuitry and the first control circuitry are integrated into a first converter module, and the second converter circuitry and the second control circuitry are integrated into a second converter module such that first and second converter modules are separate from the main control circuitry.
15. The system of claim 1 further comprising main control circuitry adapted to generate the first drive current control signal and the second drive current control signal.
16. The system of claim 1 where the first drive current control signal and the second drive current control signal are independent, pulse width modulated signals.
17. The system of claim 16 wherein the first drive current control signal is not in phase with the second drive current control signal.
18. The system of claim 16 wherein the first drive current control signal is substantially 180 degrees out of phase with the second drive current control signal.
19. The system of claim 1 wherein the first string of LEDs comprises a first type of LEDs and the second string of LEDs comprising a second type of LEDs, which is different from the first type of LEDs.
20. The system of claim 18 wherein any resultant light emitted from the first and second strings of LEDs is mixed to form white light at a desired color temperature, there is only one DC-DC conversion between the rectifier circuitry and the first string of LEDs, and there is only one DC-DC conversion between the rectifier circuitry and the second string of LEDs.
21. The system of claim 18 wherein the first and second drive currents are independently controlled such that any resultant light emitted from the first and second strings of LEDs is mixed to form white light at a desired color temperature.
22. The system of claim 1 wherein the first and second drive currents are independently controlled such that any resultant light emitted from the first and second strings of LEDs is dimmed to a desired intensity based on a dimming signal.
23. The system of claim 1 further comprising a main control system wherein the first and second drive currents are independently controlled such that any resultant light emitted from the first and second strings of LEDs is dimmed to a desired intensity based on a dimming signal.
24. A system comprising:
rectifier circuitry adapted to receive an AC power signal and provide a rectified signal;
first current control circuitry and second current control circuitry;
first converter circuitry adapted to convert the rectified signal into a first drive voltage for a first string of LEDs of a first type and provide a first drive current for the first string of LEDs based on a first drive current control signal provided by the first current control circuitry; and
second converter circuitry adapted to convert the rectified signal into a second drive voltage for a second string of LEDs of a second type and provide a second drive current for the second string of LEDs based on a second drive current control signal provided by the second current control circuitry, wherein there is only one DC-DC conversion between the rectifier circuitry and the first string of LEDs, and there is only one DC-DC conversion between the rectifier circuitry and the second string of LEDs.
25. The system of claim 24 wherein the first drive current is different than the second drive current.
26. The system of claim 25 wherein the first drive voltage is different than the second drive voltage.
27. The system of claim 26 wherein the first drive current is different than the second drive current.
28. The system of claim 24 wherein the first converter circuitry comprises a boost type DC-DC converter and the second converter circuitry comprises a boost type DC-DC converter.
29. The system of claim 24 wherein the first converter circuitry comprises a buck type DC-DC converter and the second converter circuitry comprises a boost type DC-DC converter.
30. The system of claim 24 wherein the first converter circuitry comprises a buck type DC-DC converter and the second converter circuitry comprises a buck type DC-DC converter.
31. The system of claim 24 wherein at least one of the first and second converter circuitries comprises a buck-boost type DC-DC converter.