Patent ID: 8264166

Claim:
A lamp control system mainly by controlling outputs of a buck DC-DC converter; comprising: at least one lamp structure; comprising: a lamp body; a ballast connected to the lamp body; the ballast including: a first stage for converting AC current into DC current and boosting of voltage; a buck DC-DC converter; a transistor of the buck DC-DC converter having an input end which is selected from a gate for MOSFET and a base for a bipolar transistor; a PWM controller being installed between an output end of the lamp body and the input end of the transistor; a frequency controllable oscillator being connected to the PWM controller for providing variable frequency to the PWM controller and an oscillation controlling processor being connected to the frequency controller oscillator for generating instructions to change the oscillation frequency of the frequency controller oscillator and thus to adjust the modulation frequency of the output of the PWM controller; and an igniter for triggering the lamp body to light up; and a lamp controller for controlling the lamp body; a first illumination sensor connected to the lamp controller so that the lamp controller can adjust the illumination of the lamp body.