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US 2016/0113084 A1Published application
Digital control method for low output dimming of light emitting diode (led) drivers
AssigneeGeneral Electric Company
InventorsAnthony Steven WHITE, Nina Rose SCHEIDEGGER, Gang Yao
Life of this patent
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Abstract
A method for mitigating visual fluctuation of light output at low pulse width modulation levels is disclosed. The method comprises at least the step of comparing the percent change of a previously applied input voltage value to the pulse width modulation output.
Claims18
A method for mitigating visual fluctuation comprising:
- measuring an input voltage value across input/output pins of a microcontroller;
- determining a reference voltage (VR) as a function of an input voltage (Vin) and a power supply voltage (VDD);
- calculating a percent change between the measured input voltage value and a reference pulse width modulation value;
- and
- generating an error rejection code to ignore the measured input voltage value when the percent change is determined within a predetermined range.
2 more elements
A dimming circuit comprising:
- a controller configured to:
- measure an input voltage value across input/output pins of a microcontroller;
- calculate a reference voltage (VR) by the following equation
- (VR)=((Vin/VDD)*1023)VDD
- wherein “Vin” denotes the input voltage, “VDD” denotes the voltage of the power supply;
- calculate a percent change between the measured input voltage value and a reference pulse width modulation value;
- and
- generate an error rejection code to ignore the measured input voltage value when the percent change is determined within a predetermined range.
5 more elements
A system comprising:
- a plurality of input/output pins through which data signals are transferred into and out of a microcontroller;
- a light emitting diode (LED) driver;
- a controller coupled to the LED driver and configured to provide pulse width modulation signal to the LED driver through control leads to control the light output of at least one light source attached to the LED driver;
- and
- the LED driver is configured to read an input voltage value across input pins of the microcontroller and calculate a reference voltage (VR) by the following equation
- (VR)=((Vin/VDD)*1023)VDD
- wherein “Vin” denotes the input voltage, “VDD” denotes the voltage of the power supply.
4 more elements
Dependencies are inferred from the claim text.