Advanced Configuration and Power Interface device ACPI (Advanced the Configuration and Power Interface), as the name implies, is a set of related industrial power management (Power Management) common open standard specification, the purpose of the power distribution is sent to the system components, with harddetect motherboard temperature, fan speed and the power supply voltage (Power Supply) and other information, and then provide the appropriate power with the host operating frequency, to reach the goal of coexistence of power-saving and efficiency.PM for the average desktop computer with special battery supply power portable peripherals (NB) is essential, and that is how to reduce electricity consumption to reduce the non-use of computers and peripheral equipment, extended battery life efficiencyespecially for the power supply for the effective management is the key. Advanced Power Management (Advanced Power Management; applications in the era of the past Win98/SE of APM1.2) specification, developed by Microsoft and Intel Monitor (Monitor) application programming interface, you can save the PC and has special battery, such aslaptop monitor's power supply. APM's main problem is that it is this firmware via the BIOS (firmware) dominated control can not Suizhu changes in operating procedures and effective use to adjust the power only to speculation the user via the IRQ and I / O Port activities, and therefore can not meet the power conservation, thereby extending the battery life of portable peripheral equipment needs.Moreover, the BIOS manufacturer repeat itself many BIOS R & D are required to customize different APM their code, resulting in the APM the lack of a consistent and common standard to follow. Innovation APM is also the voice application, APM / BIOS only English operating manual is extremely incomprehensible, and APM can not grasp the USB and IEEE 1394 devices, the PC market will sweep the major manufacturers are expected NB it was rising. Since 1995, Microsoft and Intel to solve the above-the combination of the following consensus: PM by the operating system (Operation System) to directly led; OS itself that have to detect functional overview of system operation, and then adjust the electricity performance advantage. Another OS with multiple language versions, allow users to amend their mother tongue elastic PM utility without limitations, thereby enabling OS companies can benefit (such as Windows). Therefore, in 1997, Intel, Microsoft, Toshiba, Compaq, Phoenix Joint publicly announced ACPI PM specifications.Back Microsoft Windows XP operating system in the public in March 2001, on the basis of the ACPI1.0 embedded certain standards ACPI2.0, including support Processor Performance State, 64bitCPU (Itanium) and Hot Plug, Processor Performance State mainlyused to adjust the CPU state to save power demand. Currently the ACPI latest version 3.0 the technical specifications publicly in September 2004. Features of ACPI is with instant software power switch to control power. Power supply switch button is not connected to the power supply itself, but is connected to the motherboard; power supply can not start the computer's power, but directly controlled by the motherboard, most multi-system used in conjunction with the ATX power supply. This allows the computer to supply low voltage, so that the computer is not completely turn off power sleep state (Idle); This also allows the computer to quickly boot, even after shutdown also 5V voltage standby.Furthermore, to the use of plug-and-play use peripherals (Plug-and-Play), ACPI device inserted into the system that detected the power management equipment. In addition, the ACPI also have NB OnNow features allows the computer immediately restored to its original working state without waiting for long boot process. Finally ACPI also provides a convenient window close, so that users can be graphical interface, set and manage power usage, better power management purposes. ACPI integration system, peripheral equipment, central processors, various types of embedded microcontrollers, the bus itself and the performance of mutual power management, temperature monitoring, reserve energy supply management. In short, ACPI specification enables the operating system, the central processing unit and peripheral equipment to integrate and exchange power usage message, simple and more effective co-management power.