Current source gate drive circuit for simultaneous firing of thyristors
CA 2193686 C · Owner: Electric Power Research Institute, Inc. · Inventors: Kemerer, Ray S.; Norman, Martin I.; Prines, Frank J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A current source gate drive circuit (80) includes tow current loops (72) each , of which serves as a current transformer primary. Electrically insulating tubes (76) enclose the current loops (72). Current transformer cores (74) around which are wound a certain number of secondary turns surround the , current loops (72). Thyristor gate driver circuits (70) are electrically coupled to the current transformer cores. Each of the driver circuits (70) receives and rectifies ac current signals for the current loops (70) and forms a current pulse train firing signal. A current pulse shaping circuit (64) is connected to the current loops and uses dual resonant LC circuits to generate the ac …
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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 June 6, 1995 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2017.
- 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.