The invention relates to an adjustable
light source system used for a color selector. The adjustable
light source system comprises an upper computer used for sending adjusting instructions. The
signal output end of the upper computer is connected with the input end of an FPGA
control circuit used for receiving the adjusting instructions, the output end of the FPGA
control circuit is connected with the input end of a DAC conversion circuit, the output end of the DAC conversion circuit is connected with the input end of a constant-current
driving circuit, the constant-current
driving circuit is used for outputting corresponding current values according to the adjusting instructions and the output end of the constant-current
driving circuit is connected with LED lamps arranged on an LED
light source panel. The invention further discloses a light source brightness adjusting method of the adjustable light
source system used for the color selector. According to the adjustable light
source system used for the color selector and the light source brightness adjusting method of the adjustable light
source system used for the color selector, the mode that a motor is used for driving a background plate does not need to be adopted, and therefore the cost is greatly reduced; the magnitude of the output currents is controlled through the upper computer, therefore, the precision of the output currents is high and
ripple noise is low; through the DAC conversion circuit, the purposes that the currents can be adjusted accurately, the speed is high and current output is continuous are realized. The adjustable light source
system is long in service life, the color selecting effect is good and stable and the adjustable light source system can be widely applied to the field of color selectors.