Method and circuit for controlling current in a high pressure discharge lamp
CA 2399896 C · Owner: Osram Sylvania Inc. · Inventors: Kang, Young G.; Konopka, John G.; Prasad, Himamshu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit for controlling current during run-up of a high pressure discharge lamp , comprises a buck converter for generating a buck current to drive the high pressure , discharge lamp and a control circuit coupled to the buck converter for varying the duty , cycle of the buck current during run-up is disclosed. A method for controlling current in an , electronic ballast during run-up of a high pressure discharge lamp comprises steps of , detecting lamp ignition, providing a buck current to drive the lamp and , varying the duty , cycle of the buck current during run-up to control the current in the lamp is also disclosed.
Read the whole patent
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
- Filed August 27, 2002 and granted April 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2024.
- 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.