US Patent No. 10,973,093
CONTROL MODULE FOR A DRIVER FOR AN ELECTRICAL LOAD
| Patent No. | 10,973,093 |
|---|---|
| Issue Date | April 06, 2021 |
| Title | Control Module For A Driver For An Electrical Load |
| Inventorship | Jonathan Picard, Bethlehem, PA (US) Johnathan Paul Ross, Bethlehem, PA (US) Robert D. Stevens, Jr., Emmaus, PA (US) |
| Assignee | Lutron Technology Company LLC, Coopersburg, PA (US) |
Claim of US Patent No. 10,973,093
1. A control module for use in a load control system for controlling a cumulative light emitted by a lighting fixture, the lighting fixture comprising one or more light-emitting diode (LED) light sources and an LED driver adapted to receive power from a power source, the LED driver including an output for conducting an output current, the LED driver characterized by a low-end intensity, the control module comprising:a first controllably conductive device configured to be electrically coupled in series with a first LED light source;
a control circuit configured to generate a first drive signal for rendering the first controllably conductive device conductive and non-conductive to control the magnitude of a first LED current through the first LED light source;
an artificial load circuit; and
a second controllably conductive device electrically coupled in series with the artificial load circuit;
wherein the control circuit is configured to generate a second drive signal for rendering the second controllably conductive device conductive to divert at least a portion of the output current of the LED driver away from the first LED light source;
wherein the control circuit is configured to pulse-width modulate the first and second drive signals and to determine respective duty cycles of the first and second drive signals in dependence upon a requested intensity for the cumulative light emitted by the lighting fixture,
wherein the requested intensity is below the low-end intensity of the LED driver; and
a third controllably conductive device configured to be electrically coupled in series with a second LED light source,
wherein the control circuit is configured to control the third controllably conductive device to control the magnitude of a second LED current through the second LED light source;
wherein the first and second LED light sources are different colors, and the control circuit is configured to control the magnitudes of the first and second LED currents to adjust a color temperature of the cumulative light emitted by the lighting fixture.
a control circuit configured to generate a first drive signal for rendering the first controllably conductive device conductive and non-conductive to control the magnitude of a first LED current through the first LED light source;
an artificial load circuit; and
a second controllably conductive device electrically coupled in series with the artificial load circuit;
wherein the control circuit is configured to generate a second drive signal for rendering the second controllably conductive device conductive to divert at least a portion of the output current of the LED driver away from the first LED light source;
wherein the control circuit is configured to pulse-width modulate the first and second drive signals and to determine respective duty cycles of the first and second drive signals in dependence upon a requested intensity for the cumulative light emitted by the lighting fixture,
wherein the requested intensity is below the low-end intensity of the LED driver; and
a third controllably conductive device configured to be electrically coupled in series with a second LED light source,
wherein the control circuit is configured to control the third controllably conductive device to control the magnitude of a second LED current through the second LED light source;
wherein the first and second LED light sources are different colors, and the control circuit is configured to control the magnitudes of the first and second LED currents to adjust a color temperature of the cumulative light emitted by the lighting fixture.