System and method for controlling maximum output drive voltage of solid state lighting device
First Claim
1. A programmable driver for driving a solid state lighting device, the driver comprising:
- a processing circuit configured to determine a voltage reference signal (Vref) based on a nominal current setting and a predetermined power limit;
a voltage feedback loop configured to receive the voltage reference signal and to generate a voltage feedback signal comprising a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device;
a current feedback loop configured to determine a generate a current feedback signal comprising a difference between a reference current and a drive current of the solid state lighting device; and
a power stage configured to adjust a maximum output voltage of the driver to enable driving the solid state lighting device based at least in part on the voltage feedback signal when the voltage feedback signal has a higher level than the current feedback signal, whereinthe predetermined power limit indicates a maximum output power the power stage is able to deliver.
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Accused Products
Abstract
A programmable driver for driving a solid state lighting device includes a processing circuit, a voltage feedback loop and a power stage. The processing circuit is configured to determine a voltage reference signal based on a nominal current setting and a predetermined power limit. The voltage feedback loop is configured to receive the voltage reference signal and to determine a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device. The power stage is configured to limit maximum output voltage for driving the solid state lighting device based at least in part on the determined difference between the reference voltage and the drive voltage of the solid state lighting device provided by the voltage feedback loop.
18 Citations
20 Claims
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1. A programmable driver for driving a solid state lighting device, the driver comprising:
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a processing circuit configured to determine a voltage reference signal (Vref) based on a nominal current setting and a predetermined power limit; a voltage feedback loop configured to receive the voltage reference signal and to generate a voltage feedback signal comprising a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the solid state lighting device; a current feedback loop configured to determine a generate a current feedback signal comprising a difference between a reference current and a drive current of the solid state lighting device; and a power stage configured to adjust a maximum output voltage of the driver to enable driving the solid state lighting device based at least in part on the voltage feedback signal when the voltage feedback signal has a higher level than the current feedback signal, wherein the predetermined power limit indicates a maximum output power the power stage is able to deliver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of driving a light-emitting diode (LED) module using a programmable driver, the method comprising:
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determining a nominal current setting indicating a desired nominal current provided by the programmable driver; determining a reference voltage signal by dividing a predetermined power limit of the programmable driver by the nominal current setting, wherein the predetermined power limit indicates a maximum output power able to be delivered to the LED module; generating a voltage feedback signal comprising a difference between a reference voltage indicated by the reference voltage signal and a drive voltage provided to the LED module; generating a current feedback signal comprising a difference between a reference current and a drive current provided to the LED module; and adjusting a maximum drive voltage provided to the LED module based at least in part on the generated voltage feedback signal when the voltage feedback signal has a higher level than the current feedback signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A programmable driver for driving a light-emitting diode (LED) module, the driver comprising:
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a microcontroller configured to determine a voltage reference signal based on a nominal current setting and a predetermined power limit; an output voltage control configured to receive the voltage reference signal and to generate a voltage feedback signal indicating a difference between a reference voltage indicated by the voltage reference signal and a drive voltage of the LED module; an output current control configured to generate a current feedback signal indicating a difference between a reference current and a drive current of the LED module; and a power stage configured to adjust a maximum output voltage of the driver to enable driving the LED module based at least in part on the voltage feedback signal when the voltage feedback signal has a higher level than the current feedback signal, wherein the predetermined power limit indicates a maximum output power that the power stage is able to deliver. - View Dependent Claims (18, 19, 20)
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Specification