Signal generating circuit for ballast control of discharge lamps
CA 1305211 C · Owner: Erhardt, Robert A. · Inventors: Erhardt, Robert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A signal generating circuit for ballast control of discharge lamps. A ballast control apparatus for an electric discharge lamp (1) comprises a first series circuit including a first winding (5) of an Ac supply voltage transformer (4), a first winding (7) of a ballast transformer (8), a lamp current sensing resistor (11) and the lamp (1). A current sensing transformer (13) has a first winding (12) parallel to the resistor (11). A second winding (16 9, 14) of the supply voltage, transformer (4) the ballast transformer (8) and the, current sensing transformer (13) are connected in a second series circuit. A signal voltage proportional to lamp power is derived by adding together the voltages …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.