Systems and methods for dimming multiple lighting devices by alternating transfer from a magnetic storage element
First Claim
1. A circuit for powering two or more lighting devices, the circuit comprising:
- a first output terminal for providing a first output current or voltage to a first one of the lighting devices;
a second output terminal for 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 primary 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;
a second switching circuit coupled to a second winding of the magnetic storage element for alternatively providing the first output current or voltage to the first output terminal during flyback intervals following the charging intervals occurring during a first synchronization phase and providing the second output current or voltage to the second output terminal during flyback intervals following the charging intervals occurring during a second synchronization phase; and
a primary-side control circuit coupled to the first switching circuit and the second switching circuit for controlling durations of each of the first synchronization phase and the second synchronization phase.
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Accused Products
Abstract
In accordance with methods and systems of the present disclosure, an integrated circuit may include an output terminal and a switching circuit. The output terminal may supply charging current to a magnetic storage element for supplying energy to two or more lighting devices coupled to the magnetic storage element. The switching circuit may have an input coupled to an input power source and an output coupled to the output terminal for charging the magnetic storage element during charging intervals, wherein energy is supplied from the magnetic storage element to a first one of the lighting devices during flyback intervals following the charging intervals occurring during a first synchronization phase and to a second one of the lighting devices during flyback intervals following the charging intervals occurring during a second synchronization phase.
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Citations
15 Claims
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1. A circuit for powering two or more lighting devices, the circuit comprising:
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a first output terminal for providing a first output current or voltage to a first one of the lighting devices; a second output terminal for 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 primary 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; a second switching circuit coupled to a second winding of the magnetic storage element for alternatively providing the first output current or voltage to the first output terminal during flyback intervals following the charging intervals occurring during a first synchronization phase and providing the second output current or voltage to the second output terminal during flyback intervals following the charging intervals occurring during a second synchronization phase; and a primary-side control circuit coupled to the first switching circuit and the second switching circuit for controlling durations of each of the first synchronization phase and the second synchronization phase. - View Dependent Claims (2, 3, 4, 5)
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6. A method of supplying power to two or more lighting devices, the method comprising:
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controlling charging of a magnetic storage element during charging intervals with a first switching circuit coupled to a primary winding of the magnetic storage element; controlling, with a second switching circuit coupled to a secondary winding of the magnetic storage element, discharging of the magnetic storage element to alternate application of energy stored in the magnetic storage element between the multiple lighting devices during alternating synchronization phases during flyback intervals following the charging intervals; providing a first output current or voltage to a first one of the lighting devices during flyback intervals occurring during a first one of the synchronization phases; providing a second output current or voltage to a second one of the lighting devices during flyback intervals occurring during a second one of the synchronization phases; and controlling, with a primary-side control circuit coupled to the first switching circuit and the second switching circuit, durations of each of the first synchronization phase and the second synchronization phase. - View Dependent Claims (7, 8, 9, 10)
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11. An integrated circuit, comprising:
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an output terminal coupled to a primary winding of a magnetic storage element for supplying charging current to the magnetic storage element, wherein the magnetic storage element is for supplying energy to two or more lighting devices coupled to a secondary winding of the magnetic storage element; a switching circuit having an input coupled to an input power source and an output coupled to the output terminal for charging the magnetic storage element during charging intervals, wherein energy is supplied from the magnetic storage element to a first one of the lighting devices during flyback intervals following the charging intervals occurring during a first synchronization phase and to a second one of the lighting devices during flyback intervals following the charging intervals occurring during a second synchronization phase; and a primary-side control circuit coupled to the switching circuit for controlling durations of each of the first synchronization phase and the second synchronization phase. - View Dependent Claims (12, 13, 14, 15)
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Specification