Power supply switch circuit with current leakage protection

An electronic device receives a start signal for the activation of power supply, comprising:

• a first switch unit receiving the start signal and outputting a trigger signal;
• a PNP transistor connected to the first switch unit and conducted by the trigger signal;
• a voltage divider unit connected to said PNP transistor and used to output a control bias according to a conduction current of said PNP transistor;
• an N-channel field effect transistor connected to said PNP transistor and said voltage divider unit, conduction of said N-channel field effect transistor being controlled by said control bias and used to maintain said PNP transistor in an on state;
• and
• a voltage clamp unit connected to said N-channel field effect transistor and providing a reference voltage to increase the level of an ON voltage of said N-channel field effect transistor;
• a microprocessor;
• and
• a second switch unit connected to the microprocessor, wherein the second switch receives the start signal and controls the microprocessor to turn on the N-channel field effect transistor via a third switch unit.