Appeal No. 97-3672
Application 08/515,312
a first branch comprising first capacitive means
interconnecting the first and second inputs,
a second branch comprising a series circuit of first
inductive means and second capacitive means and
connecting the first output to the second output,
a third branch comprising a series circuit of two
unidirectional elements which connect a common junction
point of the first inductive means and the second
capacitive means to the first input, and
a fourth branch comprising third capacitive means
for connecting a common junction point of the two
unidirectional elements to a point of the DC-AC converter
at which a high-frequency voltage is present during lamp
operation,
wherein the resonance frequency of a series circuit
formed by the first inductive means and by a parallel
arrangement of the second capacitive means and the third
capacitive means is chosen to lie within a range limited
by 0.1 Fb and 2.0 Fb, where Fb is the operating frequency
of the DC-AC converter.
11. A circuit for operating a discharge lamp
comprising:
first and second terminals for connection to a
source of pulsatory DC supply voltage for the circuit,
a DC-AC converter having first and second inputs,
means coupling said second input to said second
terminal,
a first capacitor coupled across the first and
second inputs of the DC-AC converter,
a first series circuit including a first inductor
and a second capacitor coupled across the first and second
terminals,
3
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Last modified: November 3, 2007