| 摘要 |
<p>PURPOSE: To reduce the power consumption of a lap top computer by monitoring various devices and controlling the distribution of power to the various devices of the computer. CONSTITUTION: In order to economize the power of a battery 17 by cutting power supply to the device not to be used, a power managing device 11 continuously monitors various circuit functions. This power managing device 11 can be operated in three operating modes and in the 1st mode, a computer 10 is operated in an ordinary activity mode. Besides, the 2nd state is called sleep state, the computer 10 is turned into inactive state, and the power managing device 11 continuously monitors the various conditions of circuits. Further, the 3rd state is an intermediate state and in such a state, the power managing device 11 decreases the frequency of a clock signal so that the power consumption can be decreased for about 25%-30% rather than that of ordinary operating mode. Thus, the service life of the built-in battery can be prolonged so that the lap top computer 10 can be operated for a long time when external power is cut off.</p> |
