Patent ID: 7940107

Claim:
An inrush voltage clamping circuit for an electronic device for clamping an inrush voltage induced by hot plugging, comprising: a buffer unit coupled to an input power end for receiving an inrush current of the inrush voltage, comprising: a high end control unit for generating a plurality of high end control signals; a low end control unit for generating a plurality of low end control signals; and a plurality of buffer circuits, wherein each of the plurality of buffer circuits comprises: a high end switch having an input end coupled to the input power end, an output end, and a control end coupled to the high end control unit, for conducting currents received by the input end to the output end according to one of the plurality of high end control signals; and a low end switch having an input end coupled to the output end of the high end switch, an output end coupled to a ground terminal, and a control end coupled to the low end control unit for conducting currents received by the input end to the output end according to one of the plurality of low end control signals; and a clamp unit coupled to the input power end and the buffer unit for controlling the buffer unit to receive the inrush current according to an input voltage of the input power end.