| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply control device which maintains highly accurate time correction and clock function, regardless of a use environment, and controls and executes various kinds of functions based on an exact time management. <P>SOLUTION: When the highly accurate clock by a GPS radio wave is received from a GPS antenna 10 in this power supply control device, a highly accurate clock is always generated by locking a phase locked loop circuit (PLL) in a hold-over part 19 of a clock control unit 5 in a power supply control unit 4A. When the GPS radio wave can not be normally received, the highly accurate clock depending on the GPS radio wave is set to a self-running condition without depending on a self-oscillation clock from an internal clock generating part 15. A time management part 23 automatically corrects present time information obtained when a standard radio wave is received from a radio wave antenna 13 based on the highly accurate clock. A primary voltage generating part 7 continuously generates the highly accurate clock, even if an ignition switch 3 is turned OFF, by avoiding voltage variation in battery voltages 1a and 2a while the ignition switch 3 is turned ON. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
