Power supply control circuit

摘要

A power supply control circuit for an electronic device includes an input/output (I/O) microchip, a southbridge microchip and a power management unit. The control circuit is electrically connected to the I/O microchip and the southbridge microchip to output a driving voltage to the I/O microchip and the southbridge microchip. The power management unit includes a power management microchip electrically connected to the control circuit, the I/O microchip and the southbridge microchip. The power management microchip outputs a power on/off control signal to the southbridge microchip to power on/off the electronic device, and controls the control circuit to provide a driving voltage to the I/O microchip and the southbridge microchip when the electronic device is powered on and controls the control circuit to stop providing the driving voltage to the I/O microchip and the southbridge microchip when the electronic device is powered off.

主权项

1. A power supply control circuit for an electronic device, the power supply control circuit comprising:
an input/output (I/O) microchip; a southbridge microchip electrically connected to the I/O microchip; a control circuit electrically connected to the I/O microchip and the southbridge microchip; and a power management unit comprising a power management microchip electrically connected to the control circuit, the I/O microchip and the southbridge microchip; wherein the control circuit comprises a transistor, a voltage regulator, a first voltage dividing resistor, a second voltage dividing resistor, and a first capacitor, the voltage regulator comprises a voltage input terminal electrically connected to a drain of the transistor, a voltage regulating terminal and a voltage output terminal electrically connected to the I/O microchip and the southbridge microchip, the voltage regulating terminal is grounded by the first voltage dividing resistor and grounded by the second voltage dividing resistor and the first capacitor connected in series; wherein the power management microchip outputs a power on/off control signal to the southbridge microchip to power on/off the electronic device, and controls the control circuit to provide a driving voltage to the I/O microchip and the southbridge microchip when the electronic device is powered on and controls the control circuit to stop providing the driving voltage to the I/O microchip and the southbridge microchip when the electronic device is powered off.