Solid-state lighting apparatus for use with fluorescent ballasts
View Patent ↗A lighting apparatus includes a solid-state lighting circuit, at least one ballast connection port and at least one low-frequency blocking impedance coupling the at least one ballast connection port to the solid-state lighting circuit. In some embodiments, the at least one low-frequency blocking impedance may be configured to block a DC offset. In further embodiments, the at least one low-frequency blocking impedance may be configured to block a nominally 60 Hz frequency component. The at least one ballast connection port may include a first ballast connection port and a second ballast connection port and the at least one low-frequency blocking impedance may include a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection port to a second input terminal of the solid-state lighting circuit.
1. A lighting apparatus comprising:
a housing having at least one translucent portion;
a solid-state lighting circuit within the housing and comprising at least one light emitting diode (LED);
first and second ballast connection ports supported by the housing and configured to be coupled to a ballast;
a first filament-imitating impedance within the housing and having a first terminal coupled to the first ballast connection port;
a first low-frequency blocking impedance within the housing and coupling a second terminal of the first filament-imitating impedance to a first input terminal of the solid-state lighting circuit and configured to block at least one component having a frequency of about 60 Hz or less;
a second filament-imitating impedance within the housing and having a first terminal coupled to the second ballast connection port; and
a second low-frequency blocking impedance within the housing and coupling a second terminal of the second filament-imitating impedance to a second input terminal of the solid-state lighting circuit and configured to block at least one component having a frequency of about 60 Hz or less.
2. The apparatus of claim 1 , wherein the first and second filament-imitating impedances each comprise at least one capacitor.
3. The apparatus of claim 2 , wherein the first and second filament-imitating impedances are configured to transfer power at a nominal frequency of an output produced by the ballast and to provide impedances at the first and second ballast connection ports that prevent shutdown of the ballast.
4. The apparatus of claim 2 , wherein capacitances provided at the respective first and second ballast connection ports is in a range from about 0.1 μF about 4 μF.
5. The apparatus of claim 2 , wherein each of the first and second filament-imitating impedances further comprises at least one resistor coupled in parallel with the at least one capacitor thereof.
6. The apparatus of claim 1 , where each of the first and second low-frequency blocking impedances are configured to block a DC offset.
7. The apparatus of claim 1 , wherein the each of the first and second low-frequency blocking impedances is configured to block a nominally 60 Hz frequency component.
8. The apparatus of claim 1 , wherein each of the first and second low-frequency blocking impedances comprises at least one capacitor.
9. The apparatus of claim 8 , further comprising respective resistors coupled in parallel with the at least one capacitors of the first and second low-frequency blocking impedances.
10. A fluorescent replacement lamp comprising the apparatus of claim 1 , wherein the first and second terminals of the first and second ballast connection ports comprise respective pins configured to be connected to a fluorescent lamp connector.
11. The apparatus of claim 1 , wherein the solid-state lighting circuit comprises;
a rectifier circuit having an input port coupled to the first and second low-frequency blocking impedances; and
wherein the at least one light emitting diode (LED) is coupled to an output port of the rectifier circuit.
12. The apparatus of claim 11 , wherein the solid-state lighting circuit further comprises a matching circuit.
13. The apparatus of claim 12 , wherein the matching circuit comprises:
at least one capacitor coupled in parallel with the output port of the rectifier circuit; and
at least one inductor coupled between the at least one capacitor and the at least one LED.
14. The apparatus of claim 12 , wherein the matching circuit comprises series-connected redundant components.
15. The apparatus of claim 11 , wherein the at least one LED comprises at least one LED string.
16. The apparatus of claim 11 , further comprising at least one smoothing capacitor coupled in parallel with the output of the rectifier circuit.
17. The apparatus of claim 16 , further comprising at least one resistor coupled in parallel with the smoothing capacitor.
18. The apparatus of claim 1 , wherein the first and second filament-imitating impedances comprise series-connected redundant components.
19. A lighting apparatus comprising:
a housing having at least one translucent portion;
a solid-state lighting circuit within the housing and comprising at least one LED;
at least one ballast connection port supported by the housing; and
at least one low-frequency blocking impedance within the housing and coupling the at least one ballast connection port to the solid-state lighting circuit and configured to block at least one component having a frequency of about 60 Hz or less.
20. The apparatus of claim 19 , where the at least one low-frequency blocking impedance is configured to block a DC offset.
21. The apparatus of claim 19 , wherein the at least one low-frequency blocking impedance is configured to block a nominally 60 Hz frequency component.
22. The apparatus of claim 19 , wherein the at least one low-frequency blocking impedance comprises at least one capacitor.
23. The apparatus of claim 22 , further comprising at least one resistor coupled in parallel with the at least one capacitor.
24. The apparatus of claim 19 , further comprising a filament-imitating impedance coupling the at least one ballast connection port to the at least one low-frequency blocking circuit.
25. The apparatus of claim 19 , wherein the solid-state lighting circuit comprises:
a rectifier circuit having an input port coupled to the at least one low-frequency blocking impedance; and
wherein the at least one LED is coupled to an output port of the rectifier circuit.
26. The apparatus of claim 25 , wherein the solid-state lighting circuit further comprises a matching circuit.
27. The apparatus of claim 26 , wherein the matching circuit comprises:
at least one capacitor coupled in parallel with the output port of the rectifier circuit; and
at least one inductor coupled between the at least one capacitor and the at least one LED.
28. The apparatus of claim 27 , further comprising a resistor coupled in series with the inductor.
29. The apparatus of claim 19 , wherein the at least one ballast connection port comprises a first ballast connection port and a second ballast connection port and wherein the low-frequency blocking impedance comprises a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection, port to a second input terminal of the solid-state lighting circuit.
30. The apparatus of claim 29 , where each of the first and second low-frequency blocking impedances are configured to block a DC offset.
31. The apparatus of claim 29 , wherein the each of the first and second low-frequency blocking impedances is configured to block a nominally 60 Hz frequency component.
32. The apparatus of claim 29 , wherein each of the first and second low-frequency blocking impedances comprises at least one capacitor.
33. The apparatus of claim 32 , further comprising respective resistors coupled in parallel with the at least one capacitors of the first and second low-frequency blocking impedances.