D. c. chopper regulating method and apparatus incorporating bilateral regulating voltage path
CA 2087566 A1 · Owner: Phelps, Thomas K. · Inventors: Phelps, Thomas K.; Cardwell, Gilbert I. Jr.; Le, Khanh T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
D.C. CHOPPER REGULATING METHOD AND APPARATUS INCORPORATING BILATERAL REGULATING VOLTAGE PATH, ABSTRACT OF THE DISCLOSURE An unregulated D.C. input voltage (VIN) is processed by a high power chopper (34,36) to produce a first chopped signal having the same voltage as the input (VIN) and by a, low power chopper (56,58) to produce a second chopped signal in synchronism with and having a lower voltage than the first chopped signal. The first and second chopped signals are algebraically combined by transformers (52,54) to produce an A.C. output signal which may be converted to D.C. (VOUT). The second chopped signal may be controlled to have the same polarity relative to the first chopped signal …
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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 January 19, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2015.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.