Method, apparatus and computer-readable media for controlling lighting devices
First Claim
1. A method for controlling a plurality of sets of lighting devices of a single color to generate a desired light intensity for the single color, the method comprising:
- setting start and end times for activation of each of the plurality of sets of lighting devices within a duty cycle to activate the set of lighting devices for a corresponding activation duration, the activation durations for the plurality of sets of lighting devices being set to sum to generate the desired light intensity for the single color;
wherein the plurality of sets of lighting devices are powered by a single power supply and the start and end times for activation of each of the plurality of sets of lighting devices are set to mitigate instantaneous fluctuations in current within the power supply.
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Abstract
A method for controlling pulse width modulated lighting devices within a lighting apparatus comprising a plurality of sets of lighting devices is disclosed. The method includes setting a counter for a first set of the plurality of sets of lighting devices using a master counter and an activation duration for one or more other sets of the plurality of sets of lighting devices. The method further includes determining an activation time period within a duty cycle for the first set of lighting devices using the counter for the first set of lighting devices and an activation duration for the first set of lighting devices. In some embodiments of the present invention, the lighting devices are light emitting diodes grouped into sets (or banks) and controlled to limit the magnitude and/or quantity of instantaneous current fluctuations in a power supply within the lighting apparatus.
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Citations
20 Claims
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1. A method for controlling a plurality of sets of lighting devices of a single color to generate a desired light intensity for the single color, the method comprising:
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setting start and end times for activation of each of the plurality of sets of lighting devices within a duty cycle to activate the set of lighting devices for a corresponding activation duration, the activation durations for the plurality of sets of lighting devices being set to sum to generate the desired light intensity for the single color; wherein the plurality of sets of lighting devices are powered by a single power supply and the start and end times for activation of each of the plurality of sets of lighting devices are set to mitigate instantaneous fluctuations in current within the power supply. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling at least one set of lighting devices, the set of lighting devices having a desired activation duration within a duty cycle, the method comprising:
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setting start and end times for activation of the set of lighting devices within the duty cycle to activate the set of lighting devices for a first activation duration that is higher than the desired activation duration for one or more first duty cycles; and setting start and end times for activation of the set of lighting devices within the duty cycle to activate the set of lighting devices for a second activation duration that is lower than the desired activation duration for one or more second duty cycles; wherein an average activation duration for the set of lighting devices over a plurality of duty cycles is equal to or substantially similar to the desired activation duration, the plurality of duty cycles comprising the first and second duty cycles. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A control apparatus operable to be coupled to a set of lighting devices, the control apparatus operable to cause activation of the set of lighting devices for a first activation duration within a duty cycle for one or more first duty cycles;
- and to cause activation of the set of lighting devices for a second activation duration within a duty cycle for one or more second duty cycles, the first and second activation durations being different;
wherein an average activation duration for the set of lighting devices over a plurality of duty cycles is equal to or substantially similar to a desired activation duration, the plurality of duty cycles comprising the first and second duty cycles. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
- and to cause activation of the set of lighting devices for a second activation duration within a duty cycle for one or more second duty cycles, the first and second activation durations being different;
Specification