Electrical circuit for driving LEDs in dissimilar color string lengths

An electrical circuit is disclosed. The electrical circuit comprises a plurality of color strings coupled in series, where each color string has at least one lamp, preferably a light emitting diode. The color strings may be of dissimilar length and may contain light emitting diodes of different colo...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: WEAVER MATTHEW D, FERRIER HERMAN
Format: Patent
Sprache:eng
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:An electrical circuit is disclosed. The electrical circuit comprises a plurality of color strings coupled in series, where each color string has at least one lamp, preferably a light emitting diode. The color strings may be of dissimilar length and may contain light emitting diodes of different colors. In one embodiment, a switch coupled in parallel with one of the color strings is configured to shunt power away from the color string to a power supply. In another embodiment, a switch coupled in parallel with one of the color strings is configured to shunt power away from the color string to one or more other color strings. In several embodiments, passive storage elements are utilized to store shunted power. In another embodiment, a current injector is configured to inject or remove current from a node adjacent to a color string. In several embodiments the invention is implemented as a light emitting diode driver integrated circuit or chip. Methods are disclosed for producing a desired light output utilizing color strings that may be of dissimilar length and that may contain light emitting diodes of different colors.