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.