Power Converter for Light Bulb Assembly Comprising Multiple LED Arrays

摘要

Circuitry for solid state lighting (SSL) light bulb assemblies is presented. In particular, a driver circuit and/or power converter used for such light bulb assemblies is described. A driver circuit for providing electrical power to a plurality of SSL light sources is described. The driver circuit comprises a power converter configured to provide electrical output power at an output of the power converter. Furthermore, the driver circuit comprises a plurality of light source switches configured to enable and/or to disable a supply of the electrical output power to the plurality of SSL light sources, respectively. In addition, the driver circuit comprises a controller configured to control the plurality of light source switches to enable the supply of the electrical output power to the plurality of SSL light sources in a mutually exclusive manner.

主权项

1) A driver circuit for providing electrical power to a plurality of solid state lighting, referred to as SSL, light sources, the driver circuit comprising
a power converter configured to provide electrical output power; a plurality of light source switches configured to enable and/or to disable a supply of the electrical output power to the plurality of SSL light sources, respectively; and a controller configured to
control the plurality of light source switches to enable the supply of the electrical output power to the plurality of SSL light sources in a mutually exclusive manner;assign a sequence of isolated time slots to a first SSL light source of the plurality of SSL light sources; wherein the isolated time slots of the sequence of isolated time slots are repeated at a pulse frequency; wherein the pulse frequency is greater than a perceptual frequency of light intensity variations perceivable by a human eye; andcontrol a first light source switch of the plurality of light source switches such that the electrical output power is supplied to the first SSL light source within the sequence of isolated time slots;wherein the driver circuit is configured to provide an overdrive drive current to the first SSL light source within the sequence of isolated time slots, thereby operating the first SSL light source in an overdrive mode within the sequence of isolated time slots; wherein the overdrive drive current exceeds a maximum drive current which the first SSL light source is configured to withstand during a continuous operation.