Ballast self oscillating inverter with phase controlled voltage feedback
CA 2436545 C · Owner: Alexandrov, Felix I. · Inventors: Alexandrov, Felix I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A self-oscillating ballast inverter circuit for powering a gas discharge lamp. The circuit is used in a ballast inverter to compensate positive resonance frequency shift in the inverter load during lamp starting. The circuit is built on low power components and incorporated in a DC to AC inverter providing transient advance angle for inverter switching transistors (M1 M2). , This angle advance is increased in proportion to incremental output inverter voltage that is above a selected threshold voltage. Therefore the inverter , operates above resonance frequency during lamp starting avoiding transient , cross conduction in transistors in the circuit. The feedback circuit limits voltage …
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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
- Filed October 30, 2001 and granted May 28, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2023.
- 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.