Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Reexamination Certificate
2008-04-23
2011-11-22
Chang, Daniel D (Department: 2819)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
C315S2090SC, C315S212000, C315S194000, C315S20000A
Reexamination Certificate
active
08063569
ABSTRACT:
An AC conversion circuit includes a main transformer having a primary winding and a secondary winding to electrically insulate the AC power source side and the discharge tube side from each other, an IC1arranged on the AC power source side, a plurality of switching elements arranged on the AC power source side and driven by the IC1, to pass a current through the primary winding of the main transformer based on the DC power, an IC2arranged on the discharge tube side, to generate a pair of rectangular-wave signals for conducting PWM control on a current passing through the discharge tube and having the same pulse width with a duty ratio of less than 50% and a phase difference of about 180 degrees, and one or more signal transfer insulated elements to send the pair of rectangular-wave signals from the IC2to the IC1. The IC1drives the plurality of switching elements according to the pair of rectangular-wave signals from the one or more signal transfer insulated elements, so that positive-negative symmetrical AC power is supplied from the secondary winding of the main transformer to the discharge tube.
REFERENCES:
patent: 5619402 (1997-04-01), Liu
patent: 5705897 (1998-01-01), Hanazaki et al.
patent: 7439689 (2008-10-01), Honda et al.
patent: 10 50489 (1998-02-01), None
patent: 2000 286687 (2000-10-01), None
patent: 2002 151287 (2002-05-01), None
patent: 2002 221701 (2002-08-01), None
patent: 2005 71681 (2005-03-01), None
patent: 2006 136044 (2006-05-01), None
patent: 2006 164785 (2006-06-01), None
Chang Daniel D
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sanken Electric Co. Ltd.
LandOfFree
Discharge tube power supply apparatus and semiconductor... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Discharge tube power supply apparatus and semiconductor..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discharge tube power supply apparatus and semiconductor... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4309254