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US 11,116,055 B2Granted
Time slicing method for multi-channel color tuning using a single current source input
AssigneeLumileds LLC
InventorsYifeng Qiu, Alan Andrew McReynolds
Life of this patent
Estimating the term…
Abstract
A system may include a memory configured to store instructions and a processor. The processor may be configured to execute the instructions to cause the system to determine a PWM frequency of the input PWM signal and generate a first PWM signal to power a first light emitting diode (LED), a second PWM signal to power a second LED, and a third PWM signal to power a third LED. Each of the first PWM signal, the second PWM signal, and the third PWM signal may have the PWM frequency of the input PWM signal and may be in phase with the input PWM signal.
Claims20
A system comprising:
- a memory configured to store instructions;
- and
- a hardware-based processor configured to execute the instructions to cause the system to perform operations comprising:
- determine a pulse-width modulation (PWM) frequency of an input PWM signal,
- generate a first PWM signal for a first light emitting diode (LED), a second PWM signal for a second LED, and a third PWM signal for a third LED, such that each of the first PWM signal, the second PWM signal, and the third PWM signal has the PWM frequency and is in phase with the input PWM signal,
- vary a first duty cycle of the first PWM signal, a second duty cycle of the second PWM signal, and a third duty cycle of the third PWM signal based on a control signal, such that a sum of the first duty cycle, the second duty cycle, and the third duty cycle is a predetermined percentage, and
- select values of the first duty cycle, the second duty cycle, and the third duty cycle from a table in the memory based on the control signal.
4 more elements
A system comprising:
- a first light emitting diode (LED) configured to be powered using a first pulse-width modulated (PWM) signal;
- a second LED configured to be powered using a second PWM signal;
- a third LED configured to be powered using a third PWM signal;
- a memory configured to store instructions;
- and
- a hardware-based processor configured to execute the instructions to cause the system to perform operations comprising:
- determine a PWM frequency of an input PWM signal,
- generate the first PWM signal, the second PWM signal, and the third PWM signal, such that each of the first PWM signal, the second PWM signal, and the third PWM signal has the PWM frequency and is in phase with the input PWM signal,
- vary a first duty cycle of the first PWM signal, a second duty cycle of the second PWM signal, and a third duty cycle of the third PWM signal based on a control signal, such that a sum of the first duty cycle, the second duty cycle, and the third duty cycle is a predetermined percent, and
- select values of the first duty cycle, the second duty cycle, and the third duty cycle from a configured table based on the control signal.
7 more elements
Dependencies are inferred from the claim text.