Patent ID: 7802115

Claim:
A mother board of a computer used in a vehicle comprising a power supply and an ignition connected to the power supply, the mother board comprising: a converting circuit for converting electricity; a switching circuit for controlling the transfer of electricity to the converting circuit from the power supply of the vehicle; a detecting circuit for detecting the state of the ignition of the vehicle, sending an ON signal and instructing the switching circuit to conduct the transfer if the ignition is turned on, and sending an OFF signal and instructing the switching circuit to interrupt the transfer if the ignition is turned off; a central processing unit for receiving electricity from the converting circuit and executing an operation system to turn on and off the computer; and a south bridge controller for receiving electricity from the converting circuit and executing a basic input/output system to instruct the central process to turn on the computer on receiving the ON signal and turn off the computer on receiving the OFF signal.