Power control system

摘要

A power control system includes a first comparison unit, a second comparison unit, a switching unit, and a power supply unit. The first comparison unit receives a switch voltage and a first reference voltage, compares the switch voltage with the first reference voltage and outputs a first comparison voltage. The second comparison unit receives the first comparison voltage and a second reference voltage, compares the first comparison voltage with the second reference voltage and outputs a second comparison voltage. The switching unit receives the second comparison voltage and converts a power control voltage to the switch voltage. The power supply unit receives the switch voltage and outputs a working voltage to wake up a motherboard. The power supply unit only wakes up the motherboard when the power supply unit is completely discharged.

主权项

1. A power control system comprising:
a first comparison unit configured to receive a switch voltage and a first reference voltage, compare the switch voltage with the first reference voltage and output a first comparison voltage; a second comparison unit configured to receive the first comparison voltage and a second reference voltage, compare the first comparison voltage with the second reference voltage and output a second comparison voltage; a switching unit configured to receive the second comparison voltage and convert a power control voltage to the switch voltage in dependence on the second comparison voltage; and a power supply unit configured to receive the switch voltage and output a working voltage to wake up a motherboard in dependence on the switch voltage, wherein the power supply unit only wakes up the motherboard when the power supply unit is completely discharged; wherein the first comparison unit comprises a first comparator; the first comparator comprises a non-inverting input terminal, an inverting input terminal, and an output terminal; the non-inverting input terminal of the first comparator is configured to receive the switch voltage; the inverting input terminal of the first comparator is configured to receive a direct voltage (DC) voltage via a first resistor; the inverting input terminal of the first comparator is grounded via a second resistor; the output terminal of the first comparator is configured to output the first comparison voltage; and the DC voltage generates the first reference voltage at the inverting input terminal of the first comparator by the first resistor and the second resistor.