Patent ID: 9173261
Filing Date: 2015-10-27
Classification: H02M,H05B,Y02B

Abstract:
1. A circuit for powering two or more lighting devices, the circuit comprising: at least one output terminal for providing a first output current or voltage to a first one of the lighting devices and providing a second output current or voltage to a second one of the lighting devices; a first switching circuit coupled to an input power source; a magnetic storage element having a first winding coupled to the first switching circuit, wherein the first switching circuit charges the magnetic storage element from the input power source during charging intervals of switching cycles of the first switching circuit; and a second switching circuit coupled to a terminal of the magnetic storage element for selecting, according to a synchronization signal, between providing the first output current or voltage to the first one of the lighting devices and providing the second output current or voltage to the second one of the lighting devices during alternating flyback intervals of the switching cycles that follow the charging intervals of the switching cycles, wherein the second switching circuit comprises a detection circuit for detecting changes in a voltage at the terminal of the magnetic storage element and generating the synchronization signal to provide indications in the corresponding switching cycles that the first switching circuit has commenced charging intervals of the switching cycles in response to detecting the changes in the voltage at the terminal of the magnetic storage element and wherein the second switching circuit alternates a state of the selecting in response to the synchronization signal indicating, in the charging intervals, that a next charging interval has commenced.