H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/55
H05B 37/02 (2006.01) H05B 41/295 (2006.01)
Patent
CA 1220249
Image Consumer and Consommation Corporate Affairs Canada et Corporations Canada (11) (A) No. (45) ISSUED 870407 (52) CLASS 315-55 (51) INT. CL. H05B 37/02 (19) (CA) CANADIAN PATENT (12) (54) Frequency Stabilized Automatic Gain Controlled Ballast System (72) Hanlet, Jacques M., U.S.A. (73) Granted to Intent Patent A.G. U.K. (21) APPLICATION No. 471,087 (22) FILED 841228 No. OF CLAIMS 26 Image transformer (78) as well as coupling capacitors (86 and 88) for generating a voltage across the gas dis- charge tubes (40 and 40'). Automatic gain control circuitry (17) is included in inverter transformer (78) and is made up of a pair of secondary windings (80 and 81) wound in a manner to provide a negative feedback voltage to each of the transistors (70 and 70') of switching network (13). The inverter trans- former (78) has a pair of primary windings (82 and 84) which operate alternately and are coupled to the primary winding (45) of frequency control transformer (43) to provide a repetitive cycle. First and second coupling capacitors (86 and 88) are coupled to primary windings (82 and 84) of inverter transformer (78) and filaments (42 and 42') of gas discharge tubes (40 and 40') for discharging the induced voltage across the tubes (40 and 40').
471087
Gowling Lafleur Henderson Llp
Intent Patent A.g.
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