Patent ID: 8065075

Claim:
A power control system applicable to a navigation device having at least a signal receiving module for receiving a global positioning system (GPS) signal, a signal amplifying module for receiving and amplifying the GPS signal to output a valid GPS signal, a GPS module for receiving the valid GPS signal and performing position-acquisition processes, and a GPS power management module for outputting a power management signal that allows operating power to be provided to the GPS module, the power control system comprising: a signal filtering module electrically connected to the signal amplifying module for receiving the valid GPS signal output from the signal amplifying module and performing a signal filtering process on the valid GPS signal to correspondingly obtain and output a radio frequency (RF) signal performance parameter; and a processing module electrically connected to the signal filtering module and the GPS power management module for receiving the RF signal performance parameter output by the signal filtering module and the power management signal output by the GPS power management module, and determining whether the power management signal is a power-off management signal, wherein, if the power management signal is the power-off management signal, the processing module is to further determine whether the RF signal performance parameter exceeds a predetermined first threshold value, such that, if affirmative, the processing module is managed to send a GPS power-on management signal to the GPS power management module, so as for the GPS power management module to generate a corresponding power-on management signal for allowing operating power to be provided to the GPS module; alternatively, if the power management signal is not a power-off management signal, the processing module is managed to further determine whether the RF signal performance parameter is smaller than a predetermined second threshold value, such that, if affirmative, the processing module is to send a GPS power-off management signal to the GPS power management module, so as for the GPS power management module to generate a corresponding power-off management signal for allowing the operating power of the GPS module to be cut off.