| With the rapid development of the semiconductor and mobile communication industry, smart phones, tablet PCs and handheld GPS product’s appearance greatly enrich people’s lifestyles. The common feature of them is powerful and easy to carry. However, the improved performance also makes the problem of battery power consumption increasingly serious. With the study of power management technology, using a variety of methods to reduce power consumption makes the portable devices run longer and work more stable in the case of the limited battery capacity. It has very important practical significance.This paper studies the key technology about power management and lower-power control of portable devices, and elaborates on its future development trend. Aiming at the functional requirement of portable devices,compared with power management and low-power policy,the design about power management and low-power based on ARM and Linux platform is proposed.Aiming at different power requirements of portable devices, the paper designs lithium battery charging circuit, power detection and battery protection circuit, chooses appropriate power conversion solutions. Based on the system hardware, the paper describes the realization method about battery management with the analysis of Linux driver architecture.Aiming at the problem of power consumption, sleep-wake switch mechanism is put forward by designing system working state combined with the processor’s energy-saving model and using the nature data structure and the function of Linux. The LED backlight power management framework based on Qt/Embedded application program and Linux kernel is designed to solve the problem of LCD power consumption. Finally, the paper tests the function of each modules, system consumption and performance period in power management and lower-power test program. The test results show that the chosen design can effectively save power and make the system runtime extend 46.2%, it realizes the purpose of low-power. |
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