Method for operating a frequency converter, starting circuit
CA 1060094 A · Owner: Siemens Aktiengesellschaft · Inventors: Vukasovic, Lovro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A parallel resonant circuit frequency converter having input terminals of its inverter bridged by an auxiliary commutating arrangement which consists of a bridge circuit of thyristors the a-c outputs of which, are connected to a capacitor in which thyristors of the auxiliary commutating arrangement are fired until a predetermined capacitor voltage is reached to start up the frequency converter, the thyristors of the inverter then fired until a current of predetermined magnitude flows which is kept constant by, control of the rectifier and subsequently, the thyristors of the auxiliary commutating arrangement are fired prior to each zero crossing of the resonant circuit voltage and, the …
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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 August 7, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 7, 1996.
- 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.