Design and implementation of light color correction lamp panel for LED railway signal

Aiming at the problem of color fading of existing railway signals in our country and the problem of chromaticity coordinate shift in special weather conditions, an idea of a lamp panel with adjustable lamp color is proposed. According to the Spyro extremum principle, the lamp panel array is analyzed and designed, and the red, green and blue (RGB) three-color light mixing is analyzed according to the Glassman color mixing law and the light mixing principle of the International Commission on Illumination (CIE) standard chromaticity system. The feasibility of modulation is established; the functional relationship between duty cycle, chromaticity coordinates and correlated color temperature is established respectively, and the modulation simulation and experiment of three RGB channels are carried out by means of pulse width modulation. It can be seen from the verification results that controlling the RGB three-color LED lamp beads according to the duty cycle can accurately set the relevant chromaticity coordinates of each color light, and realize the chromaticity in different situations. The light panel is expected to solve the problem of signal color decay and chromaticity coordinate shift in special weather conditions.