Full shunt boost switching voltage limiter for solar panel array
CA 2134383 C · Owner: Ashley, Christopher R. · Inventors: Ashley, Christopher R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to the present invention a bus voltage limiter (10) is connected between a photovoltaic solar panel array (14) and a load (18) to limit the output voltage to a fixed dc reference voltage (V ref). The limiter includes a pulse width modulator (20) which controls the duty cycle of a power switch (22) from 0% to 100% to maintain a substantially constant output voltage V ref. A coupled inductor type boost DC to DC converter (26) includes a pair of main winding (26A,26B) which cooperate with the duty cycle modulated power switch to provide the output voltage. An auxiliary winding (26C) provides input ripple current cancellation in conjunction with a second inductor (30) and a dc …
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 October 26, 1994 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2016.
- 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.