用电池供电的便携式产品的日益普及使得节省电源的需要显得更加突出,这就需要部分电路在不使用时能够被关闭.例如,当便携式计算机的子系统暂停不用时通过临时切断子系统的电源来减少电池消耗一这些子系统包括磁盘驱动器、存储器、通讯模块和一些其他的外围设备(见图1).电源管理技术通过尽可能多地提取NiCd或铅酸电池组的功率而延长计算时间. The growing popularity of battery-powered portable products makes the need for power savings even more pronounced, requiring some circuits to be turned off when not in use, for example by temporarily cutting off the power to the subsystem when the subsystem of the portable computer is not in use Reduce Battery Consumption One of these subsystems includes disk drives, memory, communications modules, and a few other peripherals (see Figure 1). Power management lengthens computing time by extracting as much power as NiCd or lead-acid batteries.