Chopper amplifier circuit for the supply of a current proportional to a voltage
CA 2050819 A1 · Owner: Sontag, Yves · Inventors: Lucas, Jean-Christophe; Sontag, Yves
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure relates to fast amplification circuits that are designed to provide an output current of some amperes, proportional to an input voltage and, have a frequency spectrum that may go beyond 1 MHz. A linear amplifier follows the fast variations in the input voltage and gives a load all the output current so long as this current is low. As soon as the output current from the linear amplifier reaches a given value, a chopper amplifier gives a current that causes a reduction in the output current of the linear amplifier. The circuit may be applied, in particular to the control of deflection coils and as a high efficiency amplification circuit for audiofrequencies.
Read the whole patent
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 September 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 6, 2013.
- 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.