Electric lamp and discharge devices: systems – Regulation of the control current and/or potential applied...
Reexamination Certificate
2007-10-30
2007-10-30
Owens, Douglas W. (Department: 2821)
Electric lamp and discharge devices: systems
Regulation of the control current and/or potential applied...
C315S224000, C315S291000, C315SDIG002
Reexamination Certificate
active
11208790
ABSTRACT:
A circuit arrangement for operating at least one high-pressure discharge lamp having four switches in a full bridge arrangement, a first and a second switch forming the first half-bridge arm, and a third and a fourth switch forming the second half-bridge arm, at least two terminals for coupling the high pressure discharge lamp between the midpoint of the half-bridge arms, at least one terminal for supplying the circuit arrangement with a DC voltage signal, and a drive circuit for driving the four switches, the drive circuit being designed to provide a first drive signal for the switches of the arm and a second drive signal for those of the second arm in such that the drive signals are derived from a base signal whose clock pulse is swept between a first and a second frequency.
REFERENCES:
patent: 6175195 (2001-01-01), Janczak et al.
patent: 6633138 (2003-10-01), Shannon et al.
patent: 7187139 (2007-03-01), Jin
patent: 2003/0102824 (2003-06-01), Kramer
patent: 103 33 820 (2005-02-01), None
Bessone Carlo
Owens Douglas W.
Patent-Treuhand-Gesellschaft for Elektrisch Gluhlampen mbH
Vu Jimmy
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