Appeal No. 97-1046 Page 2
Application No. 08/274,481
Claims 5 through 10, 13 through 17, 19 and 20 have been
allowed and claims 3 and 4 have been indicated by the examiner
as being directed to patentable subject matter.
The invention is directed to an inverter-type power
supply for a gas discharge lamp.
Representative independent claim 1 is reproduced as
follows:
1. An arrangement comprising:
an AC source operative to provide an AC power line
voltage at a pair of power line terminals;
a gas discharge lamp having a pair of lamp
terminals; and conditioner circuit connected between the power
line terminals and the lamp terminals; the conditioner circuit
being characterized by:
(a) being operative to draw a low-frequency line current
from the power line terminals;
(b) including an inverter sub-circuit powered from a
unidirectional voltage whose instantaneous absolute magnitude
is equal to the larger of: (i) the absolute instantaneous
magnitude of a substantially constant DC voltage; and (ii) the
absolute instantaneous magnitude of a sinusoidal voltage whose
peak absolute magnitude is higher than that of the
substantially constant DC voltage;
(c) being operative to draw current from the power line
terminals even at times when the absolute instantaneous
magnitude of the AC power line voltage is lower than that of
the substantially constant DC voltage; and
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