Patent ID: 7443228

Claim:
A leakage current prevention circuit for preventing a power source from being affected by a leakage current which is generated at the instant of disconnecting an external device from the power source, the leakage current prevention circuit comprising: a first transistor having a gate configured for receiving a control signal, a source grounded, and a drain; and a second transistor having a gate connected to the drain of the first transistor, a drain electrically connected to the power source, and a source connected to a pull-up circuit and to the gate thereof via a resistor, wherein a drive signal generated by connecting the external device to the pull-up circuit is sent to a chipset, when the chipset receives the drive signal, the control signal controls status of the first and second transistors so that voltage from the power source is provided to the pull-up circuit for a pull-up voltage for the drive signal.