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

Claim 8:
9. A lighting load control method 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 method comprising:
determining, by lighting load controller control circuitry, a transition intensity (LTRAN) that corresponds to the minimum load current (IMIN) at a 100% duty cycle;
receiving, by the lighting load controller control circuitry, a target intensity (LTRGT); and
determining, by the lighting load controller control circuitry, 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:
entering, by the lighting load controller control circuitry, a normal operating mode;
setting, by the lighting load controller control circuitry, an output duty cycle to a fixed value; and
setting, by the lighting load controller control circuitry, 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:
entering, by the lighting load controller control circuitry, a burst operating mode;
setting, by the lighting load controller control circuitry, the target load current (ITRGT) to the minimum load current (IMIN) based on the lighting load; and
varying, by the lighting load controller control circuitry, for each of a plurality of sequential burst operating periods (TBURST), 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).