Patent ID: 9414449
Filing Date: 2016-08-09
CPC Classification: H01F,H02M,H05B

Claim Text:
1. An illumination system, comprising: one or more magnetic cores; one or more control windings, each of the one or more control windings wound around at least a portion of at least one of the one or more magnetic cores; a control circuit electrically coupled to the one or more control windings, the control circuit controls a flow of direct current through the one or more control windings which causes a biasing magnetic flux in the one or more magnetic cores; one or more power windings, each of the one or more power windings wound around at least a portion of at least one of the one or more magnetic cores, the one or more power windings which in operation receive alternating current from an alternating current supply; a plurality of solid-state light sources electrically coupled to the one or more power windings; a rectifier electrically coupled to the one or more power windings and to the plurality of solid-state light sources, wherein in operation the rectifier provides a direct current to drive the plurality of solid-state light sources; and a flicker control circuit comprising a passive resonating circuit electrically coupled to the rectifier to increase a frequency of an output signal of the rectifier to a frequency that is sufficiently high that a flicker from the plurality of solid-state light sources is undetectable by an unaided human eye.