Starting circuit for gaseous discharge lamps
First Claim
1. A circuit for starting and operating an electric discharge lamp comprising:
- a pair of input terminals for connection to an alternating current supply;
a pair of output terminals for connection across said lamp;
a ballast inductor connected between one of said input terminals and one of said output terminals, said ballast inductor having a tapping point;
a connection between the other of said input terminals and the other of said output terminals; and
a high voltage starting pulse means providing a high voltage starting pulse on said lamp connected between said tapping point and said other of said input terminals, said high voltage starting pulse means comprising a non-linear dielectric element means and a semiconductor switch means connected in series.
1 Assignment
0 Petitions
Accused Products
Abstract
A starting and operating circuit for gaseous discharge lamps which includes a pair of input terminals for connection to an alternating current supply and a pair of output terminals for connection across the lamp. A ballast inductor is connected at its ends in series between one of the input terminals and one of the output terminals. A pulse generator is connected between one of the input terminals and one of the output terminals and another pulse generator is connected between a tapping point on the ballast inductor and the outer input terminal or the other output terminal or a point on the connection therebetween. The high voltage pulse generator includes a non-linear capacitor (NLC) and a semiconductor bipolar thyristor (commonly known as SIDAC) connected in series, the non-linear capacitor and the bipolar thyristor being connected in parallel with the lamp.
22 Citations
12 Claims
-
1. A circuit for starting and operating an electric discharge lamp comprising:
-
a pair of input terminals for connection to an alternating current supply; a pair of output terminals for connection across said lamp; a ballast inductor connected between one of said input terminals and one of said output terminals, said ballast inductor having a tapping point; a connection between the other of said input terminals and the other of said output terminals; and a high voltage starting pulse means providing a high voltage starting pulse on said lamp connected between said tapping point and said other of said input terminals, said high voltage starting pulse means comprising a non-linear dielectric element means and a semiconductor switch means connected in series. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A circuit for starting and operating an electric discharge lamp comprising:
-
a pair of input terminals for connection to an alternating current supply; a pair of output terminals for connection across said lamp; a ballast transformer means having input windings and output windings, said input windings connected to said input terminals and said output windings connected in series with said lamp;
said ballast transformer means having a tapping point in said transformer output windings; anda high voltage starting pulse means providing a high voltage starting pulse on said lamp connected between said tapping point and in parallel with said lamp;
said high voltage starting pulse means comprising a non-linear dielectric element means and a semiconductor switch means connected in series.
-
-
10. A circuit for starting and operating an electric discharge lamp comprising:
-
a pair of input terminals for connection to an alternating current supply; a pair of output terminals for connection across said lamp; a ballast inductor connected between one of said input terminals and one of said output terminals;
said ballast inductor having a tapping point intermediate the ends thereof to define a first and second winding portion and having a tap ratio of said first winding portion to the sum of said first and second winding portions of less than unity;a connection between the other of said input terminals and the other of said output terminals; and a high voltage starting pulse means providing a high voltage starting pulse on said lamp connected between said tapping point and said other of said input terminals;
said high voltage starting pulse means comprising a non-linear dielectric element means and a semiconductor switch means connected in series. - View Dependent Claims (11, 12)
-
Specification