The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2014
Filed:
Apr. 25, 2011
Miroslaw Marek Grotkowski, North Vancouver, CA;
Milen Moussakov, New Westminster, CA;
Gregory Bernard Sheehan, Delta, CA;
Tom William Thornton, North Vancouver, CA;
Thomas George Foxall, Surrey, CA;
Miroslaw Marek Grotkowski, North Vancouver, CA;
Milen Moussakov, New Westminster, CA;
Gregory Bernard Sheehan, Delta, CA;
Tom William Thornton, North Vancouver, CA;
Thomas George Foxall, Surrey, CA;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
Apparatus for maintaining at least a holding current in a leading-edge phase-cut dimmer during a period of transient voltage variations, the apparatus connectable to the dimmer and connectable to a load connected to draw current from the dimmer. The apparatus may comprise an edge detector connected to receive a voltage from the dimmer and generate a leading-edge signal in response to a leading-edge of a phase-cut waveform, and a current offset circuit connected to receive the leading-edge signal and draw a supplementary offset current in response to the leading-edge signal, wherein the supplementary offset current is sufficient to maintain at least a holding current in the dimmer during the period of transient voltage variations. The current offset circuit may comprise a holding current circuit which also draws supplementary current in response to an instantaneous value of load current.