Patent ID: 8106638

Claim:
A power control circuit, comprising: a scaler circuit configured for outputting a control signal; a voltage converter configured for converting a received voltage into a plurality of desired voltages; a first control unit configured for controlling whether a first voltage is applied to the voltage converter according to the control signal; a second control unit configured for controlling whether to transmit a second voltage applied to the second control unit; and a coupling circuit connected in series between the first and second control units, the coupling circuit enabling the second control unit to function ahead of the voltage converter according to the control signal wherein the first control unit comprises a first transistor, the first transistor comprises a source electrode capable of receiving the first voltage, a drain electrode connected to the voltage converter, and a gate electrode coupled to the coupling circuit; wherein the first control unit further comprises a third transistor, the third transistor comprises a base electrode connected to the scaler circuit, a emitter electrode that is grounded, and a collector electrode connected to the gate electrode of the first transistor; wherein the first control unit further comprises a fourth transistor, the fourth transistor comprises a gate electrode connected to the gate electrode of the first transistor via a resistor, a source electrode being grounded, and a drain electrode connected to the drain electrode of the first transistor via another resistor.