Lighting ballast with reverse current flow protection

Details Lighting ballast with reverse current flow protection Lighting ballast with reverse current flow protection

2005-01-25

2005-01-25

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S2090SC, C315S291000, C315S307000

Reexamination Certificate

active

06847175

ABSTRACT:
In an electric lighting fixture, a lighting ballast circuit is provided. The circuit includes a lamp portion, a switching portion, and a drive portion. The lamp portion receives a light source10. The drive portion is configured to supply signals to the switching portion. The switching portion includes first and second transistors20, 22that alternate periods of conductivity. First and second diodes34, 36in anti-parallel combinations with the first and second transistors20, 22help prevent reverse current flow through the transistors20, 22. Third and fourth diodes44, 46in series combination with collectors of the transistors20, 22further help prevent reverse current flow through the transistors20, 22. The first and second diodes34, 36route current from the drive portion via a path that by-passes the transistors20, 22so the transistors do not dissipate the power resultant from reverse current flowing thereacross. The third and fourth diodes44, 46block reverse current from flowing during periods of time when the first and second diodes34, 36are forward biased, but have not turned conductive.

REFERENCES:
patent: 4170747 (1979-10-01), Holmes
patent: 4348615 (1982-09-01), Garrison et al.
patent: 4464606 (1984-08-01), Kane
patent: 5001386 (1991-03-01), Sullivan et al.
patent: 5059870 (1991-10-01), Choon
patent: 5796214 (1998-08-01), Nerone
patent: 20030015970 (2003-01-01), Nerone
Ben G. Streetman, Solid State Electronic Devices, 2ndEdition, Published 1980 by Prentice-Hall Inc., p. 217.

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