White light-emitting-diode lamp driver based on multiple output converter with output current mode control
First Claim
1. A driver circuit comprising:
- a power supply source;
a transformer having a primary winding coupled to, and configured to receive current from, said power supply, and a plurality of secondary windings coupled to said primary winding;
a plurality of light-emitting-diode arrays, each said light-emitting-diode array coupled to one of said plurality of secondary windings;
a main controller coupled to a first of said light-emitting-diode arrays and configured to control a flow of current to said primary transformer winding;
a plurality of secondary controllers, each of said secondary controllers coupled to a second and third of said plurality of light-emitting diodes, wherein said secondary controllers are configured to control a flow of current to a corresponding light-emitting-diode array.
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Accused Products
Abstract
A white light-emitting-diode array driver circuit with a multiple output flyback (or forward) converter with output current mode control. The circuit comprises a power supply source and a transformer. The transformer has a primary winding coupled to, and configured to receive current from, the power supply, and a plurality of secondary windings coupled to the primary winding. The circuit also comprises a plurality of light-emitting-diode arrays, wherein each light-emitting-diode array is coupled to one of the secondary windings. A main controller is coupled to a first of the light-emitting-diode arrays and is configured to control a flow of current to the primary transformer winding. The circuit also comprises a plurality of secondary controllers, each of which are coupled to another of the light-emitting-diode arrays. In addition, each of the secondary controllers are configured to control a flow of current to its corresponding light-emitting-diode array. According to one embodiment of the invention, each of the light-emitting diodes has a resistor coupled to its cathode terminal. An output signal of each resistor is transmitted to the respective controller and is employed to determine the appropriate current flow to the light-emitting-diode array. The circuit may be configured as either a flyback converter, wherein the primary transformer winding is wound in the opposite direction of the secondary transformer windings, or as a forward converter, wherein the primary transformer winding is wound in the same direction as secondary transformer windings.
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Citations
26 Claims
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1. A driver circuit comprising:
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a power supply source;
a transformer having a primary winding coupled to, and configured to receive current from, said power supply, and a plurality of secondary windings coupled to said primary winding;
a plurality of light-emitting-diode arrays, each said light-emitting-diode array coupled to one of said plurality of secondary windings;
a main controller coupled to a first of said light-emitting-diode arrays and configured to control a flow of current to said primary transformer winding;
a plurality of secondary controllers, each of said secondary controllers coupled to a second and third of said plurality of light-emitting diodes, wherein said secondary controllers are configured to control a flow of current to a corresponding light-emitting-diode array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A driver circuit comprising:
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a power supply source;
a transformer having a primary winding coupled to, and configured to receive current from, said power supply, and a plurality of secondary windings coupled to said primary winding;
a plurality of light-emitting-diode arrays, each said light-emitting-diode array coupled to one of said plurality of secondary windings;
a plurality of secondary controllers, each one of said secondary controllers coupled to a corresponding one of said plurality of light-emitting-diode arrays, wherein said secondary controllers are configured to control a flow of current to said corresponding light-emitting-diode array. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification