Power converter for a configurable light-emitting diode driver
First Claim
1. A power converter circuit for an LED driver for controlling an LED light source, the power converter circuit comprising:
- a flyback transformer having primary and secondary windings, the primary winding operable to receive a rectified AC voltage;
a flyback switching transistor coupled in series with the primary winding of the flyback transformer;
a flyback controller for controlling the flyback switching transistor to be conductive and non-conductive to generate a bus voltage across a secondary winding of the flyback transformer and a center tap voltage at a center tap of the secondary winding, the flyback controller powered by a first low-voltage DC supply voltage;
a first power supply operable to receive the center tap voltage and to generate a second low-voltage DC supply voltage at an output when the center tap voltage is above a cutover voltage; and
a second power supply having an output coupled to the output of the first power supply, the second power supply operable to receive the bus voltage and to generate the second DC supply voltage when the center tap voltage is below approximately the cutover voltage.
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Accused Products
Abstract
A converter for an LED driver for an LED light source. The converter has a flyback transformer. The primary receives a rectified AC voltage. A switching transistor is coupled in series with the primary. A controller controls the switching transistor on and off to generate a bus voltage across the secondary and a center tap voltage at a center tap of the secondary. The controller is powered by a first low-voltage DC voltage. A first power supply receives the center tap voltage and generates a second low-voltage DC voltage when the center tap voltage is above a cutover voltage. A second power supply has an output coupled to the first power supply output. The second power supply receives the bus voltage and generates the second DC voltage when the center tap voltage is below the cutover voltage.
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Citations
5 Claims
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1. A power converter circuit for an LED driver for controlling an LED light source, the power converter circuit comprising:
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a flyback transformer having primary and secondary windings, the primary winding operable to receive a rectified AC voltage; a flyback switching transistor coupled in series with the primary winding of the flyback transformer; a flyback controller for controlling the flyback switching transistor to be conductive and non-conductive to generate a bus voltage across a secondary winding of the flyback transformer and a center tap voltage at a center tap of the secondary winding, the flyback controller powered by a first low-voltage DC supply voltage; a first power supply operable to receive the center tap voltage and to generate a second low-voltage DC supply voltage at an output when the center tap voltage is above a cutover voltage; and a second power supply having an output coupled to the output of the first power supply, the second power supply operable to receive the bus voltage and to generate the second DC supply voltage when the center tap voltage is below approximately the cutover voltage. - View Dependent Claims (2, 3, 4, 5)
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Specification