HIGH EFFICIENCY POWER CONTROLLER FOR LUMINAIRE
First Claim
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; and
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.
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Accused Products
Abstract
Systems, methods and articles for providing lighting or illumination systems having drive circuits that employ a magnetic amplifier (“mag-amp”) and one or more feedback circuits to form a power converter that powers solid-state light sources (e.g., LEDs). The magnetic amplifier includes one or more magnetic cores which provides a controllable reluctance for magnetic flux. The magnetic amplifier includes one or more power windings which receive energy from an alternating current (AC) supply (e.g., AC mains) and delivers rectified AC current as direct current (DC) to one or more solid-state light sources. The magnetic amplifier includes one or more control windings coupled to a DC control source. The drive circuit may have two or more rectifiers (e.g., solid-state rectifiers) to provide a direct current to drive the solid-state light sources and also to isolate the one or more control windings from interference from the magnetic flux of the one or more power windings.
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Citations
28 Claims
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1. An illumination system, comprising:
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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; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A drive circuit to drive a plurality of solid-state light sources of an illumination system, the drive circuit comprising:
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a magnetic core; a control windings wound around at least a portion of the magnetic core; a control circuit electrically coupled to the control winding, the control circuit controls a flow of direct current through the control winding which causes a biasing magnetic flux in the magnetic core; a power winding wound around at least a portion of the magnetic core; a rectifier electrically coupled to the power winding and to the plurality of solid-state light sources; and wherein in operation the power winding receives alternating current from an alternating current supply and delivers direct current to the plurality of solid-state light sources via the rectifier.
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20. A method of operation for an illumination system comprising a plurality of solid-state light sources, the method comprising:
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receiving an alternating current signal at an input terminal; rectifying the alternating current signal with a rectifier; providing the rectified current signal to the plurality of solid-state light sources via one or more power windings wound around one or more magnetic cores; and selectively controlling a flow of direct current through one or more control windings wound around the one or more magnetic cores to control the rectified current signal provided to the plurality of solid-state light sources. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification