Patent ID: 8324839

Claim:
A lamp control system comprising: a first driving circuit adapted for electrically connecting a lamp with a utility power source to convert an AC power of the utility power source to a DC power and supply the DC power to the lamp; an assistance DC power source having an output voltage lower than a working voltage of the lamp; and a second driving circuit adapted for electrically connecting the assistance DC power source with the lamp, the second driving circuit comprising a boost circuit, the boost circuit being connected to the assistance DC power source to promote the output voltage of the assistance DC power source to the working voltage of the lamp and then supply the promoted voltage to the lamp to lighten the lamp when the utility power source is off; wherein the boost circuit comprises a step-up controller, a power inductor, a first transistor and a second transistor, the assistance DC power source being electrically connected with the step-up controller, the first transistor and the second transistor being turned on and turned off repeatedly under a control of the step-up controller, during a period when the first and second transistors are both turned on, the power inductor being charged, during a period when the first and second transistors are both turned off, electrical power in the power inductor being released and supplied to the lamp; and wherein a feedback resistor is connected between one electric pin of the step-up controller and the second transistor to control a magnitude of an electric current that is supplied to the lamp by the second driving circuit.