Patent ID: 7962735

Claim:
A servo device auto-booted upon power supply recovery, comprising: a plurality of mainboards; a circuit board, electrically connected to the mainboards; a power supply, for supplying power required by the mainboards and the circuit board to operate; a memory unit, disposed on the circuit board, for storing at least one basic input/output system (BIOS); an auto-booting unit, for detecting power supplied by the power supply, wherein when the power supply recovers the supply of power after an abnormal power failure, the auto-booting unit outputs a selection signal; a switching unit, disposed on the circuit board and electrically connected to the auto-booting unit, for transmitting the BIOS to one of the mainboards according to the selection signal; and a state unit, disposed on the circuit board, for determining a use state of the BIOS used by the mainboard and generating a state signal accordingly; wherein the auto-booting unit outputs the selection signal according to the state signal, and the switching unit determines the mainboard intended for receiving the BIOS according to the selection signal; wherein the auto-booting unit comprises: a power supply state unit, for recording a power supply state of each of the mainboards; a power supply recovery unit, electrically connected to the power supply state unit, for sending a control signal according to the state signal and the power supply state when the power supply recovers the supply of power after an abnormal power failure; a selection unit, electrically connected to the switching unit, the state unit, and the power supply recovery unit, for outputting the selection signal according to the control signal; and a timing unit, electrically connected to the power supply recovery unit, for timing booting time of each of the mainboards.