Patent ID: 11950336
Assignee: LUTRON TECHNOLOGY COMPANY LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A lighting load controller to select one of a plurality of operating modes based on a received target intensity of an operatively coupled lighting load having a minimum load current (IMIN), the controller comprising:
control circuitry to:
determine a transition intensity (LTRAN) that corresponds to the minimum load current (IMIN) at a 100% duty cycle;
receive a target intensity (LTRGT); and
determine whether the received target intensity is greater than the determined transition intensity;
responsive to the determination that the received target intensity (LTRGT) is greater than the determined LTRAN:
enter a normal operating mode;
set an output duty cycle to a fixed value; and
set a target load current (ITRGT) corresponding to the received target intensity; and

responsive to the determination that the received target intensity is less than the determined LTRAN:
enter a burst operating mode;
set the target load current (ITRGT) to the minimum load current (IMIN) based on the lighting load; and
for each of a plurality of sequential burst operating periods (TBURST), vary at least one of: a duration of an active portion of the respective burst operating period (TACTIVE) or a duration of an inactive portion of the respective burst operating period (TINACTIVE).