The invention relates to a light-
dimmer driving circuit. The light-
dimmer driving circuit comprises a power supply input module, a
transformer, a current output driving module, a
pulse width modulation (PWM) module, an input
voltage sampling module, an output
voltage sampling module and a control center, wherein the power supply input module is mainly used for rectification and filtering of an input
voltage signal, the
transformer is used for
voltage reduction of the voltage
signal output by the power supply input module, the current output driving module is used for driving of current output according to the voltage
signal which is transformed, the PWM module is used for adjusting output power of the current output driving module according to a
control signal in the control center, the input voltage sampling module is used for sampling of the input voltage signal and transmitting the input voltage signal to the control center, the output voltage sampling module is used for sampling of output voltage and transmitting the output voltage to the control center, and the control center is used for controlling a PWM signal according to an input voltage sampling signal, an output voltage sampling signal and an input current signal. According to the light-
dimmer driving circuit, due to the fact that the control center is used for controlling the PWM signal according to the input voltage sampling signal, the output voltage sampling signal and the input current signal, the output power of the current output driving module is enabled to change evenly,
flicker-free light adjusting is achieved,
constant current output is achieved, and range of the light adjusting is wide.