Load control device for a light-emitting diode light source
First Claim
1. A load control device for controlling an intensity of a lighting load, the load control device comprising:
- a load regulation circuit configured to control a magnitude of a load current conducted through the lighting load; and
a control circuit operatively coupled to the load regulation circuit for pulse width modulating or pulse frequency modulating the load current to control the intensity of the lighting load to a target intensity;
wherein the control circuit is configured to control the intensity of the lighting load by pulse width modulating the load current when the target intensity is above a predetermined threshold and control the intensity of the lighting load by pulse frequency modulating the load current when the target intensity is below the predetermined threshold.
2 Assignments
0 Petitions
Accused Products
Abstract
A load control device for controlling the intensity of a lighting load, such as a light-emitting diode (LED) light source, may include a power converter circuit operable to receive a rectified AC voltage and to generate a DC bus voltage, a load regulation circuit operable to receive the bus voltage and to control the magnitude of a load current conducted through the lighting load, and a control circuit operatively coupled to the load regulation circuit for pulse width modulating or pulse frequency modulating the load current to control the intensity of the lighting load to a target intensity. The control circuit may control the intensity of the lighting load by pulse width modulating the load current when the target intensity is above a predetermined threshold and control the intensity of the lighting load by pulse frequency modulating the load current when the target intensity is below the predetermined threshold.
-
Citations
20 Claims
-
1. A load control device for controlling an intensity of a lighting load, the load control device comprising:
-
a load regulation circuit configured to control a magnitude of a load current conducted through the lighting load; and a control circuit operatively coupled to the load regulation circuit for pulse width modulating or pulse frequency modulating the load current to control the intensity of the lighting load to a target intensity; wherein the control circuit is configured to control the intensity of the lighting load by pulse width modulating the load current when the target intensity is above a predetermined threshold and control the intensity of the lighting load by pulse frequency modulating the load current when the target intensity is below the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A load control device for controlling an intensity of a lighting load, the load control device comprising:
-
a load regulation circuit configured to control a magnitude of a load current conducted through the lighting load; and a control circuit operatively coupled to the load regulation circuit for adjusting the magnitude of the load current to control the intensity of the lighting load to a target intensity; wherein the control circuit is configured to control the intensity of the lighting load by maintaining a frequency of the load current constant and adjusting an on time of the load current when the target intensity is above a predetermined threshold, and maintaining the on time of the load current constant and adjusting the frequency of the load current when the target intensity is below the predetermined threshold. - View Dependent Claims (12)
-
-
13. A method for controlling an intensity of a lighting load, the method comprising:
-
controlling a magnitude of a load current conducted through the lighting load; receiving a target intensity for the lighting load; pulse width modulating the load current to control the intensity of the lighting load to the target intensity when the target intensity is above a predetermined threshold; and pulse frequency modulating the load current to control the intensity of the lighting load to the target intensity when the target intensity is below the predetermined threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification