AC DRIVEN SOLID STATE LIGHTING APPARATUS WITH LED STRING INCLUDING SWITCHED SEGMENTS

A diode selection circuit for a light emitting apparatus according to some embodiments includes a plurality of light emitting devices coupled in series. The diode selection circuit includes a comparator configured to receive a rectified AC input signal and a reference voltage and to generate a contr...

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Bibliographische Detailangaben
Hauptverfasser: VAN DE VEN, Antony P, GIVEN, Terry
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:A diode selection circuit for a light emitting apparatus according to some embodiments includes a plurality of light emitting devices coupled in series. The diode selection circuit includes a comparator configured to receive a rectified AC input signal and a reference voltage and to generate a control signal in response to comparison of the rectified AC input signal with the reference voltage, a voltage controlled current source configured to supply a current to the plurality of light emitting diodes that is proportional to the rectified AC input signal, and a switch configured to receive the control signal and to shunt current away from at least one of the plurality of light emitting devices in response to the control signal.