Appeal No. 96-1582
Application No. 08/292,928
This is a decision on appeal from the final rejection of
claims 1 through 40, all of the claims pending.
The invention is directed to circuitry for ballasting a
gas discharge lamp.
Representative independent claim 16 is reproduced as
follows:
16. An arrangement for ballasting a gas discharge lamp,
comprising:
a power line providing a substantially sinusoidal AC
power line voltage at a pair of power line conductors; the
power line conductors being electrically connected with earth
ground;
a rectifier arrangement connected with the power line
conductors and operative: (i) to draw a line current
therefrom; and (ii) to provide a first DC voltage across a
first pair of DC terminals; the instantaneous absolute
magnitude of the first DC voltage being substantially equal to
that of the AC power line voltage; and
a circuit arrangement connected with the first pair of DC
terminals and functional to provide a high-frequency ballast
output voltage between a pair of ballast output terminals; the
ballast output terminals being operable to connect with a gas
discharge lamp; the high-frequency ballast output voltage
being of magnitude sufficient to ignite such a gas discharge
lamp and to supply it with a high-frequency lamp current; the
circuit arrangement being characterized by including an
inverter circuit supplied with DC power from a second pair of
DC terminals across which exists a second DC voltage of
substantially constant magnitude; at least part of the DC
power supplied to the inverter circuit being derived from the
ballast output terminals by way of an auxiliary DC source
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