Drive circuit for leds and an associated operating method
CA 2354473 A1 · Owner: Biebl, Alois · Inventors: Biebl, Alois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a control circuit for a LED array. The inventive circuit consists of at least two lines of LEDs whereby a line consists of , several LEDs mounted in series and connected to a distribution voltage (UBatt). A semiconductor switch (T) is connected in series between each LED line and the corresponding distribution voltage and enables to supply the LED current in a clocked manner. A measuring shunt (RShunt) is connected in series in relation to the LEDs and in the branch for the conducting-state current (IF) and between the LEDs and the ground. A control circuit controls the semiconductor switch (T) of a first LED line hereafter referred to as master , line in …
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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 April 1, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2022.
- 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.