Patent ID: 8450987

Claim:
A control signal generator, for generating a control signal to control a switch to be turned on or off, the control signal generator comprising: an inverter having an input end receiving an input voltage, an output end outputting the control signal and a first end coupled to a first system voltage; and a regulating circuit comprising a switch unit and a capacitor, wherein a first end of the switch unit is coupled to the output end of the inverter, a second end of the switch unit is coupled to the first system voltage, a third end of the switch unit is coupled to a first end of the capacitor, and a second end of the capacitor is coupled to a second system voltage, wherein when the input voltage switches from a first voltage level to a second voltage level, the switch unit is turned on and the first end of the switch unit is conducted with the third end of the switch unit, such that the capacitor is charged or discharged corresponding to the first system voltage coupled to the first end of the inverter, when the voltage level of the first end of the capacitor matches a third voltage level, the switch unit is turned off, wherein the third voltage level is between the voltage levels of the first system voltage and the second system voltage.