US Patent No. 10,251,231

LOAD CONTROL DEVICE HAVING A WIDE OUTPUT RANGE


Patent No. 10,251,231
Issue Date April 02, 2019
Title Load Control Device Having A Wide Output Range
Inventorship Stuart W. DeJonge, Riegelsville, PA (US)
Steven J. Kober, Center Valley, PA (US)
Mark S. Taipale, Harleysville, PA (US)
Assignee LUTRON ELECTRONICS CO., INC., Coopersburg, PA (US)

Claim of US Patent No. 10,251,231

1. A load control device for controlling the intensity of a lighting load, the load control device comprising:a load regulation circuit configured to control the magnitude of a load current conducted through the lighting load to adjust the intensity of the lighting load between a low-end intensity and a high-end intensity, the load regulation circuit characterized by an operating frequency;
a filter circuit configured to receive a current feedback signal from the load regulation circuit and to filter the current feedback signal to generate a filtered feedback signal; and
a control circuit operatively coupled to the load regulation circuit for controlling the magnitude of the load current towards a target current in response to the filtered feedback signal;
wherein the control circuit is configured to adjust the operating frequency of the load regulation circuit in response to the target current when the intensity of the lighting load is near the low-end intensity, the control circuit configured to control the filter circuit to filter the current feedback signal during a filter window that repeats on a periodic basis when the intensity of the lighting load is near the low-end intensity, the control circuit configured to control the filter circuit to constantly filter the current feedback signal when the intensity of the lighting load is near the high-end intensity.