| CPC H05B 45/14 (2020.01) [H04N 23/74 (2023.01); H05B 45/18 (2020.01); H05B 45/3725 (2020.01)] | 20 Claims |
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1. A charge voltage calibration system comprising:
a power supply comprising a power converter;
a light string comprising a plurality of light sources coupled in series:
a driver coupled to the power supply and to the light string, the driver comprising:
a capacitor;
a switch; and
a sense resistor;
wherein the switch, the sense resistor, and the light string are coupled in series to form a discharge path; and
wherein the discharge path is coupled in parallel with the capacitor; and
a calibration circuit comprising:
a controller;
a digital-to-analog controller (DAC);
a comparator coupled to the DAC and to the sense resistor; and
a memory device;
wherein the controller is configured to:
control the DAC to provide a reference voltage to the comparator;
cause the power converter to supply a first charge voltage to the driver;
cause the switch to transition from an off state to an on state to discharge at least a portion of a first stored energy in the capacitor through the discharge path; and
store a value of the first charge voltage in the memory device in response to detection by the comparator of a first discharge voltage generated across the sense resistor being greater than or equal to the reference voltage.
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