Control apparatus of resistance welders and control method thereof
CA 1316575 C · Owner: Izume, Takatomo · Inventors: Izume, Takatomo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control apparatus for a single-phase full-wave resistance welder in which anti-parallel connected thyristors are connected in series with a primary winding of a welding transformer and which controls a firing phase .theta.n of the thyristors to adjust a welding current, includes storage means for calculating and storing a square sum SK in such a manner that a sinusoidal value VK = K0sin.theta.K having a given peak value is divided at predetermined phase intervals (1°) within a predetermined phase range (180°), and the square sum SK = V12 + V22 + V32 +... VK2 of the sinusoidal value VK with respect to each phase .theta.K is calculated in units of divided phases .theta.K (.theta.K = 1° 2°, …
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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 April 20, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 20, 2010.
- 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
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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.