Patent ID: 7545106

Claim:
A discharge lamp driving device for driving a lamp module comprising a plurality of lamps, comprising: a switch circuit, for convening a received signal to an alternating current signal; a transformer and filter circuit, connected between the switch circuit and the lamp module, and used for amplifying and shaping the alternating current signal; and a microcontroller, connected to the switch circuit, for outputting a control signal to control the switch circuit to output the alternating current signal to the lamp module, the microcontroller comprising: an analog/digital converter for converting received analog signals to digital signals; a protecting module, for comparing the digital signals with predetermined values, and outputting a protecting control signal; a PWM control module, for receiving one of the digital signals, and providing a PWM signal to adjust current flowing through the lamp module; a dimming control module, for receiving another of the digital signals, and providing a PWM dimming control signal to adjust brightness of the lamp module; and signal synthesizing module, for combining the protecting control signal, the PWM current adjusting signal, and the PWM dimming control signal into a PWM control signal, and outputting the PWM control signal to the switch circuit.