CONFIGURABLE LOAD CONTROL DEVICE FOR LIGHT-EMITTING DIODE LIGHT SOURCES
First Claim
1. An LED driver for controlling an LED light source, the LED driver comprising:
- a power converter circuit operable to receive a rectified AC voltage and to generate a DC bus voltage;
an LED drive circuit operable to receive the bus voltage and to control both the magnitude of a load current conducted through the LED light source and the magnitude of a load voltage produced across the LED light source; and
a control circuit coupled to the LED drive circuit for adjusting the magnitude of the load current conducted through the LED light source when operating in a current load control mode, and adjusting the magnitude of the load voltage produced across the LED light source when operating in a voltage load control mode.
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Accused Products
Abstract
A configurable light-emitting diode (LED) driver is adapted to control a plurality of different LED light sources, which may be rated to operate using different load control techniques, different dimming techniques, and different magnitudes of load current and voltage. The LED driver comprises a power converter circuit for generating a DC bus voltage, and an LED drive circuit for receiving the bus voltage and adjusting either the magnitude of the current conducted through the LED light source or the magnitude of the voltage across the LED light source. The LED driver is operable to dim the LED light source using either a pulse-width modulation technique or a constant current reduction technique, and may be configured using a programming device and a personal computer.
190 Citations
80 Claims
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1. An LED driver for controlling an LED light source, the LED driver comprising:
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a power converter circuit operable to receive a rectified AC voltage and to generate a DC bus voltage; an LED drive circuit operable to receive the bus voltage and to control both the magnitude of a load current conducted through the LED light source and the magnitude of a load voltage produced across the LED light source; and a control circuit coupled to the LED drive circuit for adjusting the magnitude of the load current conducted through the LED light source when operating in a current load control mode, and adjusting the magnitude of the load voltage produced across the LED light source when operating in a voltage load control mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. 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 (27, 28, 29, 30)
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31. An LED driver for driving an LED light source including at least one LED, the LED driver comprising:
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a first circuit receiving a rectified AC voltage and providing a DC bus voltage; a second circuit receiving said DC bus voltage and producing one of a load current through said LED light source or a load voltage across said LED light source; a control circuit having a first control input from said first circuit and a second control input from said second circuit and further having a first control output provided to said first circuit and a second control output provided to said second circuit; said first control input comprising a signal related to said DC bus voltage; said first control output comprising a control signal for controlling said first circuit to deliver a desired DC bus voltage; said second control input comprising a signal related to either or both the load current provided by said second circuit through said LED light source and said load voltage provided by said second circuit to said LED light source; said second control output comprising a control signal to regulate either or both said load current to said LED light source and said load voltage provided to said LED light source; and wherein said second circuit comprises a linear regulator circuit having a power semiconductor device adapted to be coupled in series with said LED light source. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 45, 46)
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- 43. The LED driver of clam 42, wherein said first circuit comprises a flyback switching converter having a transformer providing DC isolation between said rectified AC signal and said second circuit.
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47. A system for configuring at least one output parameter of a lighting load power supply, the lighting load power supply having a programmable controller for regulating the output parameter to a target value and having a memory for storing a variable for setting the target value of the output parameter, the power supply having a communication port for receiving data for setting the target value, the system comprising:
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a computer executing software allowing a user to select a target value of an output parameter of the lighting load power supply and having a first port providing data related to the selected output parameter; and a programming device having a second port in communication with the first port of said computer and for providing data relating to said selected output parameter in a form usable by said lighting load power supply to said communication port of said lighting load power supply for programming said programmable controller to set the output parameter to the selected target value. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A method of configuring at least one output parameter of a programmable lighting load power supply, the lighting load power supply having a programmable controller and a memory for storing the at least one output parameter, and further having a communication port for receiving data for configuring the lighting load power supply with the at least one output parameter, the method comprising:
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providing software for use on a computer for selecting the at least one parameter; allowing a user to select the at least one parameter using the software; providing first data from the computer relating to the selection of the at least one parameter to a programming device; and the programming device providing second data to the communication port of the lighting load power supply to program the programmable controller to set the output of the programmable lighting load power supply to the at least one output parameter. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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Specification