Pulse width modulated dc to dc power supply
CA 1114448 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Rao, Neti R.M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A switched-mode supply circuit whose output direct voltage is substantially independent of variations in the input direct voltage by means of a pulse duration modulation of a controlled switch connected in series with the primary winding of a transformer. A first rectifier connected to a first secondary winding of the transformer conducts during the out off period of the switch whereas a second rectifier connected to a second secondary winding of the transformer conducts during the conduction period of the switch. A load is coupled to both rectifiers so that the output voltage across the load is the sum of the first and second direct voltages derived from the first and second rectifiers, …
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
- Granted December 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 1998.
- 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.