Active filter for a traction motor supplied from a single-phase catenary
CA 2104633 C · Owner: Liu, Rong Fan · Inventors: Liu, Rong Fan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an active filter for filtering the current and eventually, improving the power factor of a traction unit powered by single-phase catenary voltage through collection of the voltage provided by the catenary and distribution of the output voltage to the traction equipment and auxiliary equipment (6,7). It includes a number of forced switch bridges (10,11) with a power source greater than or equal to 2. The bridges are connected in series alternating current side, and independently supplied by direct voltage. The active filter (8) also comprises a control system which forces the switching of the bridges to develop single-phase current side, an alternating current from …
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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 August 23, 1993 and granted January 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2015.
- 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.