Appeal No. 2000-0706
Application No. 08/675,665
BACKGROUND
Appellants' invention relates to a circuit arrangement which makes it possible to
operate lamps with a comparatively high burning voltage by means of a supply voltage
source delivering a first DC voltage of comparatively low amplitude such that lower
power losses occur in the circuit. The lower voltage bypasses the circuit and is added
to the higher voltage produced so that the resultant voltage is a combination of the two
voltages and currents. An understanding of the invention can be derived from a
reading of exemplary claim 1, which is reproduced below.
1. A circuit arrangement for operating a discharge lamp, the circuit
arrangement having reduced power loss, comprising:
a first circuit for generating a second DC voltage from a first DC
voltage, including
input terminals for connection to a voltage source having a
cathode and an anode for supplying the first circuit with the first DC
voltage,
a switching element,
a control circuit coupled to the switching element for
changing the conductive state of the switching element,
a unidirectional element, and
a transformer having a primary and a secondary winding;
and
a second circuit coupled to the secondary winding for supplying
current to the discharge lamp;
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: November 3, 2007