Ballast for a discharge lamp

Electric lamp and discharge devices: systems – Current and/or voltage regulation

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C315S246000, C315S245000, C315S224000

Reexamination Certificate

active

07053564

ABSTRACT:
The invention relates to ballast for a discharge lamp (16), comprising a direct-current supply phase (2), semiconductor switches (10, 11), operated at a high-frequency clock frequency for modifying the direction of current through the discharge lamp (16), an ignition transformer (15), which can be supplied with the direct current of the direct-current supply phase (2) via a series capacitor (14) and a choke inductance (17) that is connected to an electrode of the discharge of the discharge lamp (16), said electrode not being connected to the ignition transformer (15). To increase the ignition reliability of the discharge lamp (16), a capacitor (24), connected in series to a switch (23), is connected between a junction point (27) of the series capacitor (14) and ignition transformer (15) on one side and a junction point (26) between the discharge lamp (16) and the choke inductance (17) on the other side, and the capacitor (24) and the choke inductance (17) form a series resonant circuit that is tuned to a higher harmonic of the clock frequency.

REFERENCES:
patent: 4134044 (1979-01-01), Holmes
patent: 5185560 (1993-02-01), Nilssen
patent: 5233273 (1993-08-01), Waki et al.
patent: 5399944 (1995-03-01), Konopka et al.
patent: 5828185 (1998-10-01), Fellows et al.
patent: 5998939 (1999-12-01), Fellows et al.
patent: 6002210 (1999-12-01), Nilssen
patent: 6667585 (2003-12-01), O'Meara
patent: 6680585 (2004-01-01), Trestman
patent: 6683418 (2004-01-01), Shoji et al.
patent: 29921144 (1999-12-01), None
patent: 0078864 (1983-05-01), None
patent: 0477621 (1992-04-01), None
patent: 0739154 (1996-10-01), None
patent: WO 00/30413 (1999-11-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Ballast for a discharge lamp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ballast for a discharge lamp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ballast for a discharge lamp will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3595460

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.